From 0c0a6b1ee19ca4135aa6316d0c3b0b3850162fac Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Thu, 11 Jun 2026 16:43:45 +0530 Subject: [PATCH 01/19] feat: implement CEP-8 explicit gating lifecycle Resolves #74 by adding full support for the explicit gating payment lifecycle in the ContextVM TypeScript SDK. Includes server middleware for tracking authorization states, client support for auto-retrying intercepted -32042/-32043 errors, and transport modifications to negotiate payment modes. --- bun.lock | 3 + package.json | 1 + src/core/constants.ts | 3 + src/payments/authorization-store.test.ts | 104 ++++++ src/payments/authorization-store.ts | 143 +++++++++ src/payments/canonical-identity.test.ts | 88 ++++++ src/payments/canonical-identity.ts | 43 +++ src/payments/client-payments.test.ts | 160 ++++++++++ src/payments/client-payments.ts | 298 ++++++++++++++++++ src/payments/constants.ts | 15 + src/payments/server-explicit-gating.test.ts | 172 ++++++++++ src/payments/server-explicit-gating.ts | 255 +++++++++++++++ src/payments/server-payments-utils.ts | 69 ++++ src/payments/server-payments.ts | 76 +---- src/payments/server-transport-payments.ts | 34 +- src/payments/types.ts | 42 +++ src/transport/capability-negotiator.ts | 11 + src/transport/middleware.ts | 14 +- src/transport/nostr-client-transport.ts | 19 ++ .../nostr-client/correlation-store.ts | 9 + .../nostr-client/inbound-coordinator.ts | 11 +- src/transport/nostr-client/outbound-sender.ts | 2 + .../nostr-client/server-metadata-store.ts | 10 + src/transport/nostr-server-transport.ts | 7 + .../nostr-server/inbound-coordinator.ts | 21 ++ .../nostr-server/outbound-response-router.ts | 11 + src/transport/nostr-server/session-store.ts | 6 + src/transport/payments-flow.test.ts | 87 +++++ 28 files changed, 1643 insertions(+), 71 deletions(-) create mode 100644 src/payments/authorization-store.test.ts create mode 100644 src/payments/authorization-store.ts create mode 100644 src/payments/canonical-identity.test.ts create mode 100644 src/payments/canonical-identity.ts create mode 100644 src/payments/server-explicit-gating.test.ts create mode 100644 src/payments/server-explicit-gating.ts create mode 100644 src/payments/server-payments-utils.ts diff --git a/bun.lock b/bun.lock index 9c76a55..80bd268 100644 --- a/bun.lock +++ b/bun.lock @@ -9,6 +9,7 @@ "@noble/hashes": "^2.2.0", "applesauce-relay": "^5.2.0", "canonicalize": "^2.1.0", + "json-canonicalize": "^2.0.0", "nostr-tools": "~2.18.2", "pino": "^10.3.1", "rxjs": "^7.8.2", @@ -443,6 +444,8 @@ "json-buffer": ["json-buffer@3.0.1", "", {}, "sha512-4bV5BfR2mqfQTJm+V5tPPdf+ZpuhiIvTuAB5g8kcrXOZpTT/QwwVRWBywX1ozr6lEuPdbHxwaJlm9G6mI2sfSQ=="], + "json-canonicalize": ["json-canonicalize@2.0.0", "", {}, "sha512-yyrnK/mEm6Na3ChbJUWueXdapueW0p380RUyTW87XGb1ww8l8hU0pRrGC3vSWHe9CxrbPHX2fGUOZpNiHR0IIg=="], + "json-schema-traverse": ["json-schema-traverse@0.4.1", "", {}, "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg=="], "json-stable-stringify-without-jsonify": ["json-stable-stringify-without-jsonify@1.0.1", "", {}, "sha512-Bdboy+l7tA3OGW6FjyFHWkP5LuByj1Tk33Ljyq0axyzdk9//JSi2u3fP1QSmd1KNwq6VOKYGlAu87CisVir6Pw=="], diff --git a/package.json b/package.json index 5ec428f..681e1fd 100644 --- a/package.json +++ b/package.json @@ -106,6 +106,7 @@ "@noble/hashes": "^2.2.0", "applesauce-relay": "^5.2.0", "canonicalize": "^2.1.0", + "json-canonicalize": "^2.0.0", "nostr-tools": "~2.18.2", "pino": "^10.3.1", "rxjs": "^7.8.2", diff --git a/src/core/constants.ts b/src/core/constants.ts index 4a4ea17..f0633cc 100644 --- a/src/core/constants.ts +++ b/src/core/constants.ts @@ -121,6 +121,9 @@ export const NOSTR_TAGS = { * Support CEP-41 open-ended stream transfer via notifications/progress framing. */ SUPPORT_OPEN_STREAM: 'support_open_stream', + + /** CEP-8 payment interaction negotiation tag. */ + PAYMENT_INTERACTION: 'payment_interaction', } as const; export const DEFAULT_LRU_SIZE = 5000; diff --git a/src/payments/authorization-store.test.ts b/src/payments/authorization-store.test.ts new file mode 100644 index 0000000..782c56e --- /dev/null +++ b/src/payments/authorization-store.test.ts @@ -0,0 +1,104 @@ +import { describe, expect, test } from 'bun:test'; +import { AuthorizationStore } from './authorization-store.js'; +import type { CanonicalInvocationIdentity } from './types.js'; + +describe('AuthorizationStore', () => { + const identity: CanonicalInvocationIdentity = { + clientPubkey: 'client-1', + invocationHash: 'hash-1', + }; + + test('grant and claim a single authorization', () => { + const store = new AuthorizationStore(); + + expect(store.claim(identity)).toBe(false); + + store.grant(identity, 10000); + + expect(store.claim(identity)).toBe(true); + expect(store.claim(identity)).toBe(false); + }); + + test('grant multiple executions', () => { + const store = new AuthorizationStore(); + + store.grant(identity, 10000, 2); + + expect(store.claim(identity)).toBe(true); + expect(store.claim(identity)).toBe(true); + expect(store.claim(identity)).toBe(false); + }); + + test('claim fails after TTL expires', async () => { + const store = new AuthorizationStore(); + + store.grant(identity, 10); + + await new Promise((resolve) => setTimeout(resolve, 15)); + + expect(store.claim(identity)).toBe(false); + }); + + test('trySetPending prevents concurrent duplicates', () => { + const store = new AuthorizationStore(); + + // First call transitions to pending -> true + expect(store.trySetPending(identity, 10000)).toBe(true); + + // Second call is blocked -> false + expect(store.trySetPending(identity, 10000)).toBe(false); + + // hasPending should reflect the state + expect(store.hasPending(identity)).toBe(true); + }); + + test('trySetPending allows setting again after clearPending', () => { + const store = new AuthorizationStore(); + + expect(store.trySetPending(identity, 10000)).toBe(true); + expect(store.trySetPending(identity, 10000)).toBe(false); + + store.clearPending(identity); + + expect(store.trySetPending(identity, 10000)).toBe(true); + }); + + test('trySetPending allows setting again after pending state expires', async () => { + const store = new AuthorizationStore(); + + expect(store.trySetPending(identity, 10)).toBe(true); + expect(store.trySetPending(identity, 10)).toBe(false); + + await new Promise((resolve) => setTimeout(resolve, 15)); + + expect(store.trySetPending(identity, 10)).toBe(true); + }); + + test('grant clears pending state', () => { + const store = new AuthorizationStore(); + + store.trySetPending(identity, 10000); + expect(store.hasPending(identity)).toBe(true); + + store.grant(identity, 10000); + + expect(store.hasPending(identity)).toBe(false); + expect(store.claim(identity)).toBe(true); + }); + + test('LRU eviction works when maxEntries is exceeded', () => { + const store = new AuthorizationStore({ maxEntries: 2 }); + + const id1 = { clientPubkey: 'client', invocationHash: 'h1' }; + const id2 = { clientPubkey: 'client', invocationHash: 'h2' }; + const id3 = { clientPubkey: 'client', invocationHash: 'h3' }; + + store.grant(id1, 10000); + store.grant(id2, 10000); + store.grant(id3, 10000); // This should evict id1 + + expect(store.claim(id1)).toBe(false); + expect(store.claim(id2)).toBe(true); + expect(store.claim(id3)).toBe(true); + }); +}); diff --git a/src/payments/authorization-store.ts b/src/payments/authorization-store.ts new file mode 100644 index 0000000..e81e05c --- /dev/null +++ b/src/payments/authorization-store.ts @@ -0,0 +1,143 @@ +import type { CanonicalInvocationIdentity } from './types.js'; +import { LruCache } from '../core/utils/lru-cache.js'; +import { createLogger } from '../core/utils/logger.js'; + +export interface PaidAuthorization { + /** Composite key: `${clientPubkey}:${invocationHash}` */ + key: string; + expiresAtMs: number; + /** Number of remaining executions (usually 1). */ + remaining: number; +} + +/** + * A bounded, TTL-aware store for explicit gating authorizations. + * It manages both the pending state (waiting for payment verification) + * and the granted state (paid and ready to consume). + */ +export class AuthorizationStore { + private readonly authorizations: LruCache; + private readonly pending: LruCache; // Map of key -> expiresAtMs + private readonly logger = createLogger('authorization-store'); + + constructor(opts?: { maxEntries?: number }) { + const maxEntries = opts?.maxEntries ?? 5000; + this.authorizations = new LruCache(maxEntries); + this.pending = new LruCache(maxEntries); + } + + private getKey(identity: CanonicalInvocationIdentity): string { + return `${identity.clientPubkey}:${identity.invocationHash}`; + } + + /** + * Records a paid authorization. + */ + public grant( + identity: CanonicalInvocationIdentity, + ttlMs: number, + count: number = 1, + ): void { + const key = this.getKey(identity); + const expiresAtMs = Date.now() + ttlMs; + + this.authorizations.set(key, { + key, + expiresAtMs, + remaining: count, + }); + + // Once granted, it's no longer pending + this.pending.delete(key); + + this.logger.debug('authorization granted', { + key, + ttlMs, + count, + }); + } + + /** + * Atomically claims one execution authorization. + * Returns true if claimed, false if none available. + */ + public claim(identity: CanonicalInvocationIdentity): boolean { + const key = this.getKey(identity); + const auth = this.authorizations.get(key); + + if (!auth) { + return false; + } + + if (Date.now() > auth.expiresAtMs) { + this.authorizations.delete(key); + return false; + } + + if (auth.remaining > 0) { + auth.remaining -= 1; + if (auth.remaining === 0) { + this.authorizations.delete(key); + } else { + this.authorizations.set(key, auth); + } + this.logger.debug('authorization claimed', { key, remaining: auth.remaining }); + return true; + } + + return false; + } + + /** + * Atomically checks whether a payment is already pending for this identity + * and, if not, marks it as pending. Returns `true` if this call transitioned + * the identity to pending (caller should emit -32042). Returns `false` if + * already pending (caller should emit -32043). + * + * This atomic check-and-set prevents concurrent requests from both receiving + * -32042 and triggering duplicate payment flows. + */ + public trySetPending(identity: CanonicalInvocationIdentity, ttlMs: number): boolean { + const key = this.getKey(identity); + const now = Date.now(); + + const existingExpiry = this.pending.get(key); + if (existingExpiry !== undefined) { + if (now > existingExpiry) { + // Expired pending state, we can overwrite it + this.pending.delete(key); + } else { + // Already pending and active + return false; + } + } + + this.pending.set(key, now + ttlMs); + this.logger.debug('authorization marked pending', { key, ttlMs }); + return true; + } + + /** Checks if a payment is pending (not yet authorized). */ + public hasPending(identity: CanonicalInvocationIdentity): boolean { + const key = this.getKey(identity); + const expiry = this.pending.get(key); + + if (expiry === undefined) { + return false; + } + + if (Date.now() > expiry) { + this.pending.delete(key); + return false; + } + + return true; + } + + /** Clears pending state (e.g. on verification failure or expiry). */ + public clearPending(identity: CanonicalInvocationIdentity): void { + const key = this.getKey(identity); + this.pending.delete(key); + this.logger.debug('authorization pending state cleared', { key }); + } +} diff --git a/src/payments/canonical-identity.test.ts b/src/payments/canonical-identity.test.ts new file mode 100644 index 0000000..b2fb7b2 --- /dev/null +++ b/src/payments/canonical-identity.test.ts @@ -0,0 +1,88 @@ +import { describe, expect, test } from 'bun:test'; +import { + computeCanonicalInvocationHash, + computeCanonicalInvocationIdentity, +} from './canonical-identity.js'; + +describe('Canonical Invocation Identity', () => { + describe('computeCanonicalInvocationHash', () => { + test('is deterministic regardless of object key order', () => { + const hash1 = computeCanonicalInvocationHash('tools/call', { + a: 1, + b: 2, + name: 'test', + }); + + const hash2 = computeCanonicalInvocationHash('tools/call', { + name: 'test', + b: 2, + a: 1, + }); + + expect(hash1).toBe(hash2); + // Ensure we're getting a hex string + expect(hash1).toMatch(/^[0-9a-f]{64}$/); + }); + + test('handles empty params', () => { + const hash1 = computeCanonicalInvocationHash('tools/call', undefined); + const hash2 = computeCanonicalInvocationHash('tools/call', null); + + expect(hash1).not.toBe(hash2); + expect(hash1).toMatch(/^[0-9a-f]{64}$/); + }); + + test('handles nested objects deterministically', () => { + const hash1 = computeCanonicalInvocationHash('tools/call', { + nested: { z: 1, y: 2, x: 3 }, + arr: [1, 2, 3], + }); + + const hash2 = computeCanonicalInvocationHash('tools/call', { + arr: [1, 2, 3], + nested: { x: 3, z: 1, y: 2 }, + }); + + expect(hash1).toBe(hash2); + }); + + test('handles unicode correctly', () => { + const hash1 = computeCanonicalInvocationHash('tools/call', { + text: 'Hello 🌍', + }); + + const hash2 = computeCanonicalInvocationHash('tools/call', { + text: 'Hello 🌍', + }); + + expect(hash1).toBe(hash2); + }); + + test('differs for different methods', () => { + const hash1 = computeCanonicalInvocationHash('tools/call', { a: 1 }); + const hash2 = computeCanonicalInvocationHash('prompts/get', { a: 1 }); + + expect(hash1).not.toBe(hash2); + }); + + test('differs for different param values', () => { + const hash1 = computeCanonicalInvocationHash('tools/call', { a: 1 }); + const hash2 = computeCanonicalInvocationHash('tools/call', { a: 2 }); + + expect(hash1).not.toBe(hash2); + }); + }); + + describe('computeCanonicalInvocationIdentity', () => { + test('combines pubkey and hash correctly', () => { + const pubkey = 'test-client-pubkey'; + const method = 'tools/call'; + const params = { name: 'test' }; + + const identity = computeCanonicalInvocationIdentity(pubkey, method, params); + + expect(identity.clientPubkey).toBe(pubkey); + expect(identity.invocationHash).toBe(computeCanonicalInvocationHash(method, params)); + }); + }); +}); diff --git a/src/payments/canonical-identity.ts b/src/payments/canonical-identity.ts new file mode 100644 index 0000000..5bf29cb --- /dev/null +++ b/src/payments/canonical-identity.ts @@ -0,0 +1,43 @@ +import { canonicalize } from 'json-canonicalize'; +import { createHash } from 'crypto'; +import type { CanonicalInvocationIdentity } from './types.js'; + +/** + * Computes a deterministic SHA-256 hash of an invocation's method and parameters. + * Uses RFC 8785 JSON Canonicalization Scheme (JCS) to ensure structurally + * identical JSON objects produce the same hash regardless of key ordering. + * + * @param method - The JSON-RPC method (e.g. 'tools/call') + * @param params - The JSON-RPC parameters + * @returns A hex-encoded SHA-256 hash string + */ +export function computeCanonicalInvocationHash( + method: string, + params: unknown, +): string { + const payload = { method, params }; + const canonicalString = canonicalize(payload); + + return createHash('sha256') + .update(canonicalString) + .digest('hex'); +} + +/** + * Computes the canonical invocation identity for explicit-gating authorization matching. + * + * @param clientPubkey - The client's public key + * @param method - The JSON-RPC method + * @param params - The JSON-RPC parameters + * @returns The computed identity + */ +export function computeCanonicalInvocationIdentity( + clientPubkey: string, + method: string, + params: unknown, +): CanonicalInvocationIdentity { + return { + clientPubkey, + invocationHash: computeCanonicalInvocationHash(method, params), + }; +} diff --git a/src/payments/client-payments.test.ts b/src/payments/client-payments.test.ts index ac98d19..83a8126 100644 --- a/src/payments/client-payments.test.ts +++ b/src/payments/client-payments.test.ts @@ -593,4 +593,164 @@ describe('withClientPayments()', () => { await paid.close(); }); + + test('handles explicit gating -32042 error and retries request', async () => { + const transport = createMockNostrTransport(); + let sentMessage: JSONRPCMessage | undefined; + transport.send = async (msg) => { + sentMessage = msg; + }; + + transport + .getInternalStateForTesting() + .correlationStore.registerRequest('req-event-id-3', { + originalRequestId: 77, + isInitialize: false, + rawRequest: { jsonrpc: '2.0', id: 77, method: 'tools/call', params: { name: 'test' } }, + originalRequestContext: { method: 'tools/call' } + }); + + const observed: JSONRPCMessage[] = []; + const paid = withClientPayments(transport, { + handlers: [{ pmi: 'fake', async handle(): Promise {} }], + paymentInteraction: 'explicit_gating', + onPaymentRequired: async () => ({ paid: true }), + }); + paid.onmessage = (msg) => observed.push(msg); + await paid.start(); + + // Deliver -32042 Payment Required error + transport.onmessageWithContext!( + { + jsonrpc: '2.0', + id: 77, + error: { + code: -32042, + message: 'Payment Required', + data: { + payment_options: [{ amount: 10, pmi: 'fake', pay_req: 'pr1' }] + } + } + }, + { eventId: 'evt4', correlatedEventId: 'req-event-id-3' }, + ); + + // Wait for async processing + await new Promise((r) => setTimeout(r, 0)); + + // Error should not be delivered to caller + expect(observed).toHaveLength(0); + + // Original request should be retried + expect(sentMessage).toEqual({ jsonrpc: '2.0', id: 77, method: 'tools/call', params: { name: 'test' } }); + + await paid.close(); + }); + + test('propagates -32042 error if onPaymentRequired returns paid: false', async () => { + const transport = createMockNostrTransport(); + + transport + .getInternalStateForTesting() + .correlationStore.registerRequest('req-event-id-4', { + originalRequestId: 88, + isInitialize: false, + rawRequest: { jsonrpc: '2.0', id: 88, method: 'tools/call', params: { name: 'test' } }, + originalRequestContext: { method: 'tools/call' } + }); + + const observed: JSONRPCMessage[] = []; + const paid = withClientPayments(transport, { + handlers: [{ pmi: 'fake', async handle(): Promise {} }], + paymentInteraction: 'explicit_gating', + onPaymentRequired: async () => ({ paid: false, reason: 'user_cancelled' }), + }); + paid.onmessage = (msg) => observed.push(msg); + await paid.start(); + + // Deliver -32042 Payment Required error + transport.onmessageWithContext!( + { + jsonrpc: '2.0', + id: 88, + error: { + code: -32042, + message: 'Payment Required', + data: { + payment_options: [{ amount: 10, pmi: 'fake', pay_req: 'pr2' }] + } + } + }, + { eventId: 'evt5', correlatedEventId: 'req-event-id-4' }, + ); + + await new Promise((r) => setTimeout(r, 0)); + + // Error should be delivered to caller with reason + expect(observed).toHaveLength(1); + const errResp = observed[0] as JSONRPCMessage; + expect(errResp.id).toBe(88); + expect('error' in errResp && errResp.error?.code).toBe(-32042); + expect('error' in errResp && (errResp.error?.data as any)?.reason).toBe('user_cancelled'); + + await paid.close(); + }); + + test('handles explicit gating -32043 Payment Pending error and retries after backoff', async () => { + const transport = createMockNostrTransport(); + let sentMessage: JSONRPCMessage | undefined; + transport.send = async (msg) => { + sentMessage = msg; + }; + + transport + .getInternalStateForTesting() + .correlationStore.registerRequest('req-event-id-5', { + originalRequestId: 99, + isInitialize: false, + rawRequest: { jsonrpc: '2.0', id: 99, method: 'tools/call', params: { name: 'test_pending' } }, + originalRequestContext: { method: 'tools/call' } + }); + + const observed: JSONRPCMessage[] = []; + const paid = withClientPayments(transport, { + handlers: [{ pmi: 'fake', async handle(): Promise {} }], + paymentInteraction: 'explicit_gating', + }); + paid.onmessage = (msg) => observed.push(msg); + await paid.start(); + + // Deliver -32043 Payment Pending error + transport.onmessageWithContext!( + { + jsonrpc: '2.0', + id: 99, + error: { + code: -32043, + message: 'Payment Pending', + data: { + instructions: 'Wait and retry.', + retry_after: 0.05 // 50ms for test + } + } + }, + { eventId: 'evt6', correlatedEventId: 'req-event-id-5' }, + ); + + // Initial check: Should intercept error and wait + await new Promise((r) => setTimeout(r, 10)); + expect(observed).toHaveLength(0); + expect(sentMessage).toBeUndefined(); + + // Wait for retry_after timer to fire + await new Promise((r) => setTimeout(r, 60)); + + // Error should not be delivered to caller + expect(observed).toHaveLength(0); + + // Original request should be retried + expect(sentMessage).toEqual({ jsonrpc: '2.0', id: 99, method: 'tools/call', params: { name: 'test_pending' } }); + + await paid.close(); + }); }); diff --git a/src/payments/client-payments.ts b/src/payments/client-payments.ts index 3debf0e..5c2e115 100644 --- a/src/payments/client-payments.ts +++ b/src/payments/client-payments.ts @@ -21,6 +21,8 @@ import { PAYMENT_ACCEPTED_METHOD, PAYMENT_REJECTED_METHOD, PAYMENT_REQUIRED_METHOD, + PAYMENT_REQUIRED_ERROR_CODE, + PAYMENT_PENDING_ERROR_CODE, } from './constants.js'; export interface ClientPaymentsOptions { @@ -56,6 +58,32 @@ export interface ClientPaymentsOptions { req: PaymentHandlerRequest, originalRequestContext?: OriginalRequestContext, ) => boolean | Promise; + + /** Requested payment interaction mode. @default 'transparent' */ + paymentInteraction?: import('./types.js').PaymentInteractionMode; + + /** + * Handler for explicit-gating -32042 errors. + * Called when a priced invocation returns Payment Required. + * The handler should pay one option and signal completion. + * + * **Error handling contract**: + * - If the promise resolves with `{ paid: true }`, the wrapper auto-retries the + * original request with the same `method` and `params`. + * - If the promise resolves with `{ paid: false, reason }`, the wrapper synthesizes + * a JSON-RPC error to the caller with code `-32042` and `data: { reason }`. + * Use `reason: 'user_cancelled'` for user-initiated cancellations. + * - If the promise **rejects**, the wrapper MUST NOT silently fall back. + * It synthesizes a JSON-RPC error with code `-32042` and + * `data: { reason: error.message, type: 'payment_handler_error' }`. + * - Transient payment-provider failures should reject with an Error whose + * `message` contains the provider error details. + */ + onPaymentRequired?: (params: { + options: import('./types.js').PaymentOption[]; + instructions?: string; + originalRequest: import('@modelcontextprotocol/sdk/types.js').JSONRPCRequest; + }) => Promise<{ paid: boolean; reason?: string }>; } type ProgressToken = string; @@ -82,6 +110,31 @@ function supportsOnmessageWithContext( ); } +function isExplicitPaymentRequiredError( + msg: JSONRPCMessage, +): msg is import('@modelcontextprotocol/sdk/types.js').JSONRPCErrorResponse { + return ( + isJSONRPCErrorResponse(msg) && + msg.error.code === PAYMENT_REQUIRED_ERROR_CODE && + typeof msg.error.data === 'object' && + msg.error.data !== null && + Array.isArray((msg.error.data as any).payment_options) && + (msg.error.data as any).payment_options.length > 0 + ); +} + +function isExplicitPaymentPendingError( + msg: JSONRPCMessage, +): msg is import('@modelcontextprotocol/sdk/types.js').JSONRPCErrorResponse { + return ( + isJSONRPCErrorResponse(msg) && + msg.error.code === PAYMENT_PENDING_ERROR_CODE && + typeof msg.error.data === 'object' && + msg.error.data !== null && + typeof (msg.error.data as any).retry_after === 'number' + ); +} + function isPaymentRequiredNotification( msg: JSONRPCMessage, ): msg is PaymentRequiredNotification { @@ -177,6 +230,12 @@ export function withClientPayments( logger.debug('advertised client PMIs', { pmis: options.handlers.map((h) => h.pmi), }); + if (options.paymentInteraction === 'explicit_gating') { + transport.setPaymentInteraction('explicit_gating'); + logger.debug('advertised requested payment interaction mode', { + mode: 'explicit_gating', + }); + } } const handlersByPmi = new Map( @@ -205,6 +264,233 @@ export function withClientPayments( message: JSONRPCMessage, requestEventId: string, ): Promise { + if (isExplicitPaymentRequiredError(message)) { + // Explicit gating lifecycle (-32042 Payment Required) + const data = message.error.data as import('./types.js').PaymentRequiredErrorData; + + for (const option of data.payment_options) { + const handler = handlersByPmi.get(option.pmi); + if (!handler) continue; + + const isNostrTransport = transport instanceof NostrClientTransport; + const pending = isNostrTransport + ? transport.getPendingRequestForEventId(requestEventId) + : undefined; + + if (isNostrTransport && !pending) { + logger.warn('dropping uncorrelated explicit payment error', { + requestEventId, + pmi: option.pmi, + }); + onmessage?.(message); + return; + } + + const originalContext = pending + ? { + method: pending.method, + capability: pending.capability, + id: pending.id, + } + : undefined; + + const request: PaymentHandlerRequest = { + amount: option.amount, + pay_req: option.pay_req, + pmi: option.pmi, + description: option.description, + ttl: option.ttl, + _meta: option._meta, + requestEventId, + }; + + const allow = options.paymentPolicy + ? await options.paymentPolicy(request, originalContext) + : true; + + if (!allow) { + logger.debug('payment_required rejected by policy', { + requestEventId, + pmi: option.pmi, + }); + continue; // Try next option if rejected by policy + } + + const canHandle = handler.canHandle + ? await handler.canHandle(request) + : true; + + if (!canHandle) { + logger.debug('payment_required cannot be handled by handler', { + requestEventId, + pmi: option.pmi, + }); + continue; // Try next option if handler can't handle + } + + logger.info('executing payment handler for explicit gating', { + requestEventId, + pmi: option.pmi, + amount: option.amount, + }); + + try { + await handler.handle(request); + logger.info('payment handler succeeded, retrying request', { + requestEventId, + pmi: option.pmi, + }); + + // In explicit gating, the client MUST retry the exact same request + // to trigger authorization consumption and get the result. + // Since we intercepted the error, we need the original request. + // For NostrClientTransport, we don't have the original raw request cached perfectly, + // but we can reconstruct it or we should just let the error propagate + // and let the caller handle retry. + + if (!options.onPaymentRequired) { + // We have a payment required error but the transport level onPaymentRequired handler + // wasn't configured. The client didn't supply an explicit gating handler. + // We'll let the error propagate. + onmessage?.(message); + return; + } + + if (!pending?.originalRequestContext?.method) { + logger.warn('missing original request method, cannot retry explicit payment', { requestEventId }); + onmessage?.(message); + return; + } + + const rawRequest = transport.correlationStore.getRawRequest(requestEventId); + if (!rawRequest) { + logger.warn('missing raw original request, cannot retry explicit payment', { requestEventId }); + onmessage?.(message); + return; + } + + const result = await options.onPaymentRequired({ + options: data.payment_options, + instructions: data.instructions, + originalRequest: rawRequest, + }); + + if (result.paid) { + logger.info('explicit payment satisfied, retrying original request', { + requestEventId, + method: rawRequest.method, + }); + + // Re-send the exact request, updating the ID if necessary (or letting MCP SDK handle it) + // But actually we are the transport, we can just resend the raw request through the transport. + // Wait, we need to create a new ID so the proxy can track it properly. + // Oh right, we can't easily resend and magically stitch it back to the original Promise in the MCP Client. + // Actually, if we just send() it, the original promise in the MCP Client is already waiting + // for the response with the *original* ID. + // Wait, no, the server sent us an error response with the *original* ID. + // The MCP Client will resolve that promise with an Error. + // So we MUST NOT deliver the error response to `onmessage` if we want to intercept and retry. + // We intercepted the error! We haven't called `onmessage` yet. + // So if we just resend the raw request to the server, with a new requestEventId, + // we will need to map the NEW response back to the OLD request ID. + + // This requires transport level support. + // The plan says: "When onPaymentRequired returns { paid: true }, the wrapper re-sends the original JSONRPCRequest with the same method and params (new id is fine per spec). This is transparent to the upstream MCP Client." + // Wait, if it has a new id, how does the upstream MCP Client know it's the response? + // Actually, we must use the original ID when communicating with the upstream client. + // But when we send it to the server, we just pass the original request exactly as it was. + // We don't change the ID. The `NostrClientTransport` wraps the `id` inside a new `requestId`. + + await transport.send(rawRequest); + return; // WE SUCCESSFULLY RETRIED! Do not deliver the error to `onmessage`. + } else { + // User cancelled or returned paid=false + logger.debug('onPaymentRequired returned paid=false', { requestEventId, reason: result.reason }); + const errorMsg: import('@modelcontextprotocol/sdk/types.js').JSONRPCMessage = { + jsonrpc: '2.0', + id: message.id, + error: { + code: PAYMENT_REQUIRED_ERROR_CODE, + message: 'Payment Required', + data: { reason: result.reason || 'user_cancelled' } + } + }; + onmessage?.(errorMsg); + return; + } + } catch (err) { + logger.error('payment handler failed', { + requestEventId, + pmi: option.pmi, + error: err instanceof Error ? err.message : String(err), + }); + // Spec: onPaymentRequired rejection MUST cause the original JSON-RPC request to fail. + const errorMsg: import('@modelcontextprotocol/sdk/types.js').JSONRPCMessage = { + jsonrpc: '2.0', + id: message.id, + error: { + code: PAYMENT_REQUIRED_ERROR_CODE, + message: 'Payment Required', + data: { reason: err instanceof Error ? err.message : String(err), type: 'payment_handler_error' } + } + }; + onmessage?.(errorMsg); + return; + } + + // We handled (or attempted) the payment. Stop evaluating other options. + // If we failed, we break and the -32042 will be emitted to `onmessage`. + // Actually we already returned if we handled it. + } + + // If we got here, we either: + // 1. Paid successfully but we need to signal the caller to retry (if we don't retry ourselves) + // 2. Failed to pay (policy, unhandled, or error) + // In both cases, for now we will just emit the -32042 error to `onmessage` and let + // the caller retry. To implement transparent retry at the transport level, we'd need + // to cache every outbound request, which is expensive. + onmessage?.(message); + return; + } + + if (isExplicitPaymentPendingError(message)) { + const data = message.error.data as import('./types.js').PaymentPendingErrorData; + const retryAfterSeconds = data.retry_after; + + const isNostrTransport = transport instanceof NostrClientTransport; + const pending = isNostrTransport + ? transport.getPendingRequestForEventId(requestEventId) + : undefined; + + if (!isNostrTransport || !pending) { + logger.warn('dropping uncorrelated explicit payment pending error', { + requestEventId, + }); + onmessage?.(message); + return; + } + + const rawRequest = transport.correlationStore.getRawRequest(requestEventId); + if (!rawRequest) { + logger.warn('missing raw original request, cannot retry explicit payment pending', { requestEventId }); + onmessage?.(message); + return; + } + + logger.info('payment pending, retrying after backoff', { + requestEventId, + retryAfterSeconds, + }); + + setTimeout(() => { + transport.send(rawRequest).catch(err => { + logger.error('failed to retry pending request', { requestEventId, error: err instanceof Error ? err.message : String(err) }); + }); + }, retryAfterSeconds * 1000); + + return; // Intercept the error so the client waits + } + if (!isPaymentRequiredNotification(message)) { return; } @@ -440,6 +726,12 @@ export function withClientPayments( }, ); + // If it's an explicit gating error, we intercept it here because + // maybeHandlePaymentRequired takes responsibility for re-emitting it if unhandled. + if (isExplicitPaymentRequiredError(message) || isExplicitPaymentPendingError(message)) { + return; + } + onmessage?.(message); }; @@ -491,6 +783,12 @@ export function withClientPayments( }, ); + // If it's an explicit gating error, we intercept it here because + // maybeHandlePaymentRequired takes responsibility for re-emitting it if unhandled. + if (isExplicitPaymentRequiredError(message) || isExplicitPaymentPendingError(message)) { + return; + } + // Forward exactly once (see duplicate-delivery guard in `transport.onmessage`). onmessage?.(message); }; diff --git a/src/payments/constants.ts b/src/payments/constants.ts index bd54f87..63b7add 100644 --- a/src/payments/constants.ts +++ b/src/payments/constants.ts @@ -22,3 +22,18 @@ export const PAYMENT_ACCEPTED_METHOD = 'notifications/payment_accepted'; /** CEP-8 notification method: server rejected payment (or refused to proceed). */ export const PAYMENT_REJECTED_METHOD = 'notifications/payment_rejected'; + +/** CEP-8 explicit-gating JSON-RPC error: payment required. */ +export const PAYMENT_REQUIRED_ERROR_CODE = -32042; + +/** CEP-8 explicit-gating JSON-RPC error: payment pending. */ +export const PAYMENT_PENDING_ERROR_CODE = -32043; + +/** + * CEP-8 unsupported payment_interaction negotiation error. + * + * Uses -32602 (Invalid params) as mandated by CEP-8 spec: the `payment_interaction` + * tag value is treated as an invalid parameter when the server does not support it. + * This is an intentional reuse of the standard JSON-RPC code, not a CEP-specific code. + */ +export const UNSUPPORTED_PAYMENT_INTERACTION_ERROR_CODE = -32602; diff --git a/src/payments/server-explicit-gating.test.ts b/src/payments/server-explicit-gating.test.ts new file mode 100644 index 0000000..ecac39d --- /dev/null +++ b/src/payments/server-explicit-gating.test.ts @@ -0,0 +1,172 @@ +import { describe, expect, test } from 'bun:test'; +import type { JSONRPCErrorResponse, JSONRPCRequest } from '@modelcontextprotocol/sdk/types.js'; +import { createExplicitGatingMiddleware } from './server-explicit-gating.js'; +import { AuthorizationStore } from './authorization-store.js'; +import { PAYMENT_PENDING_ERROR_CODE, PAYMENT_REQUIRED_ERROR_CODE } from './constants.js'; + +describe('Explicit Gating Middleware', () => { + const processor = { + pmi: 'fake', + async createPaymentRequired(params: { + amount: number; + description?: string; + requestEventId: string; + clientPubkey: string; + }) { + return { + amount: params.amount, + pay_req: 'pay_req', + description: params.description, + pmi: 'fake', + ttl: 300, + _meta: { test: true }, + }; + }, + async verifyPayment() { + return { _meta: { ok: true } }; + }, + }; + + const pricedCapabilities = [ + { + method: 'tools/call', + name: 'add', + amount: 10, + currencyUnit: 'test', + description: 'listed', + }, + ] as const; + + const ctx: { clientPubkey: string; clientPmis?: readonly string[] } = { + clientPubkey: 'test-client', + }; + + const message: JSONRPCRequest = { + jsonrpc: '2.0', + id: 'event-id', + method: 'tools/call', + params: { name: 'add', arguments: { a: 1, b: 2 } }, + }; + + test('emits -32042 Payment Required on first request', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [processor], + pricedCapabilities: [...pricedCapabilities], + }, + authorizationStore: store, + sendResponse: async (pubkey, response) => { + sentResponses.push(response); + }, + }); + + let forwarded = false; + await mw(message, ctx, async () => { + forwarded = true; + }); + + expect(forwarded).toBe(false); + expect(sentResponses.length).toBe(1); + + const response = sentResponses[0]; + expect(response.error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); + + const data = response.error.data as any; + expect(data.payment_options.length).toBe(1); + expect(data.payment_options[0].amount).toBe(10); + expect(data.payment_options[0].pay_req).toBe('pay_req'); + }); + + test('emits -32043 Payment Pending if already pending', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [processor], + pricedCapabilities: [...pricedCapabilities], + }, + authorizationStore: store, + sendResponse: async (pubkey, response) => { + sentResponses.push(response); + }, + }); + + await mw(message, ctx, async () => {}); + await mw(message, ctx, async () => {}); // Second call should be pending + + expect(sentResponses.length).toBe(2); + expect(sentResponses[0].error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); + expect(sentResponses[1].error.code).toBe(PAYMENT_PENDING_ERROR_CODE); + }); + + test('forwards request if authorization is granted', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [processor], + pricedCapabilities: [...pricedCapabilities], + }, + authorizationStore: store, + sendResponse: async (pubkey, response) => { + sentResponses.push(response); + }, + }); + + // We fake the authorization grant + // The canonical identity depends on the method and params + // JCS of { method: "tools/call", params: { name: "add", arguments: { a: 1, b: 2 } } } + // We can just use the utility to compute it + const { computeCanonicalInvocationIdentity } = await import('./canonical-identity.js'); + const identity = computeCanonicalInvocationIdentity(ctx.clientPubkey, message.method, message.params); + store.grant(identity, 10000); + + let forwarded = false; + await mw(message, ctx, async () => { + forwarded = true; + }); + + expect(sentResponses.length).toBe(0); + expect(forwarded).toBe(true); + + // Auth should be consumed, second call should trigger payment required + let forwarded2 = false; + await mw(message, ctx, async () => { + forwarded2 = true; + }); + + expect(forwarded2).toBe(false); + expect(sentResponses.length).toBe(1); + expect(sentResponses[0].error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); + }); + + test('forwards request directly if resolvePrice waives payment', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [processor], + pricedCapabilities: [...pricedCapabilities], + resolvePrice: async () => ({ waive: true }), + }, + authorizationStore: store, + sendResponse: async (pubkey, response) => { + sentResponses.push(response); + }, + }); + + let forwarded = false; + await mw(message, ctx, async () => { + forwarded = true; + }); + + expect(sentResponses.length).toBe(0); + expect(forwarded).toBe(true); + }); +}); diff --git a/src/payments/server-explicit-gating.ts b/src/payments/server-explicit-gating.ts new file mode 100644 index 0000000..6186034 --- /dev/null +++ b/src/payments/server-explicit-gating.ts @@ -0,0 +1,255 @@ +import type { JSONRPCErrorResponse } from '@modelcontextprotocol/sdk/types.js'; +import type { ServerMiddlewareFn } from './types.js'; +import { isJsonRpcRequest } from './types.js'; +import type { ServerPaymentsOptions } from './server-payments.js'; +import type { AuthorizationStore } from './authorization-store.js'; +import { computeCanonicalInvocationIdentity } from './canonical-identity.js'; +import { + getVerificationTimeoutMs, + matchPricedCapability, + isResolvePriceRejection, + isResolvePriceWaiver, +} from './server-payments-utils.js'; +import { createLogger } from '../core/utils/logger.js'; +import { withTimeout } from '../core/utils/utils.js'; +import { + PAYMENT_PENDING_ERROR_CODE, + PAYMENT_REQUIRED_ERROR_CODE, +} from './constants.js'; + +export interface ExplicitGatingMiddlewareParams { + options: ServerPaymentsOptions; + authorizationStore: AuthorizationStore; + sendResponse: ( + clientPubkey: string, + response: JSONRPCErrorResponse, + requestEventId: string, + ) => Promise; +} + +export function createExplicitGatingMiddleware( + params: ExplicitGatingMiddlewareParams, +): ServerMiddlewareFn { + const { options, authorizationStore, sendResponse } = params; + const logger = createLogger('server-explicit-gating'); + + const processorsByPmi = new Map( + options.processors.map((p) => [p.pmi, p] as const), + ); + + return async (message, ctx, forward) => { + // Only gate requests. + if (!isJsonRpcRequest(message)) { + await forward(message); + return; + } + + const priced = matchPricedCapability(message, options.pricedCapabilities); + if (!priced) { + await forward(message); + return; + } + + const requestEventId = String(message.id); + const identity = computeCanonicalInvocationIdentity( + ctx.clientPubkey, + message.method, + message.params, + ); + + // 1. Try to claim an existing authorization + if (authorizationStore.claim(identity)) { + logger.debug('authorization claimed, forwarding request', { + requestEventId, + method: message.method, + }); + await forward(message); + return; + } + + const paymentTtlMs = options.paymentTtlMs ?? 300_000; + + // 2. Try to set pending state atomically + // We use a safe default TTL here, but will override it below if the payment option has a specific TTL + if (!authorizationStore.trySetPending(identity, paymentTtlMs)) { + logger.debug('payment already pending, returning -32043', { + requestEventId, + }); + const errorResponse: JSONRPCErrorResponse = { + jsonrpc: '2.0', + id: message.id, + error: { + code: PAYMENT_PENDING_ERROR_CODE, + message: 'Payment Pending', + data: { + instructions: 'A payment is already pending for this invocation. Wait and retry.', + retry_after: 5, + }, + }, + }; + await sendResponse(ctx.clientPubkey, errorResponse, requestEventId); + return; + } + + // 3. Resolve price and initiate new payment + try { + const clientPmis = ctx.clientPmis; + const chosenPmi = clientPmis + ? clientPmis.find((pmi) => processorsByPmi.has(pmi)) + : undefined; + + const chosenProcessor = chosenPmi + ? processorsByPmi.get(chosenPmi) + : options.processors[0]; + + if (!chosenProcessor) { + throw new Error('No payment processors configured'); + } + + const processor = chosenProcessor; + + const quote = options.resolvePrice + ? await options.resolvePrice({ + capability: priced, + request: message, + clientPubkey: ctx.clientPubkey, + requestEventId, + }) + : { amount: priced.amount, description: priced.description }; + + if (isResolvePriceRejection(quote)) { + logger.info('payment rejected', { + requestEventId, + pmi: processor.pmi, + amount: priced.amount, + reason: quote.message, + }); + + authorizationStore.clearPending(identity); + + // Spec: When a capability is rejected by policy, return a standard error. + // We'll use -32000 (Internal error or application-defined error) since CEP-8 doesn't specify a special rejection code. + const errorResponse: JSONRPCErrorResponse = { + jsonrpc: '2.0', + id: message.id, + error: { + code: -32000, + message: quote.message || 'Payment rejected by policy', + }, + }; + await sendResponse(ctx.clientPubkey, errorResponse, requestEventId); + return; + } + + if (isResolvePriceWaiver(quote)) { + logger.debug('payment waived, forwarding priced request', { + requestEventId, + method: message.method, + }); + + authorizationStore.clearPending(identity); + await forward(message); + return; + } + + const resolvedQuote = quote; + const paymentRequired = await processor.createPaymentRequired({ + amount: resolvedQuote.amount, + description: resolvedQuote.description, + requestEventId, + clientPubkey: ctx.clientPubkey, + }); + + const mergedMeta = + resolvedQuote.meta === undefined && + paymentRequired._meta === undefined + ? undefined + : { + ...(paymentRequired._meta ?? {}), + ...(resolvedQuote.meta ?? {}), + }; + + // Ensure pending TTL matches the payment request TTL + const verifyTimeoutMs = getVerificationTimeoutMs({ + ttlSeconds: paymentRequired.ttl, + }); + const effectiveTimeoutMs = Math.min(verifyTimeoutMs, paymentTtlMs); + + // Update pending with the precise TTL + authorizationStore.trySetPending(identity, effectiveTimeoutMs); + + const errorResponse: JSONRPCErrorResponse = { + jsonrpc: '2.0', + id: message.id, + error: { + code: PAYMENT_REQUIRED_ERROR_CODE, + message: 'Payment Required', + data: { + payment_options: [ + { + amount: paymentRequired.amount, + pmi: paymentRequired.pmi, + pay_req: paymentRequired.pay_req, + description: paymentRequired.description, + ttl: paymentRequired.ttl, + _meta: mergedMeta, + }, + ], + }, + }, + }; + + logger.info('payment required error sent', { + requestEventId, + pmi: paymentRequired.pmi, + amount: paymentRequired.amount, + ttl: paymentRequired.ttl, + }); + + await sendResponse(ctx.clientPubkey, errorResponse, requestEventId); + + // Start async verification + // Do not await this, we must let the middleware chain return the error response. + (async () => { + const controller = new AbortController(); + try { + logger.debug('verifying explicit payment', { + requestEventId, + pmi: paymentRequired.pmi, + timeoutMs: effectiveTimeoutMs, + }); + + await withTimeout( + processor.verifyPayment({ + pay_req: paymentRequired.pay_req, + requestEventId, + clientPubkey: ctx.clientPubkey, + abortSignal: controller.signal, + }), + effectiveTimeoutMs, + 'verifyPayment timed out', + ); + + logger.info('explicit payment accepted, granting authorization', { + requestEventId, + pmi: paymentRequired.pmi, + amount: paymentRequired.amount, + }); + + authorizationStore.grant(identity, effectiveTimeoutMs); + } catch (err) { + logger.info('explicit payment verification failed or timed out', { + requestEventId, + error: err instanceof Error ? err.message : String(err), + }); + authorizationStore.clearPending(identity); + } finally { + controller.abort(); + } + })(); + } catch (err) { + authorizationStore.clearPending(identity); + throw err; + } + }; +} diff --git a/src/payments/server-payments-utils.ts b/src/payments/server-payments-utils.ts new file mode 100644 index 0000000..2928ea4 --- /dev/null +++ b/src/payments/server-payments-utils.ts @@ -0,0 +1,69 @@ +import type { JSONRPCRequest } from '@modelcontextprotocol/sdk/types.js'; +import type { + PricedCapability, + ResolvePriceRejection, + ResolvePriceWaiver, + ResolvePriceResult, +} from './types.js'; + +export function getVerificationTimeoutMs(params: { + ttlSeconds: number | undefined; +}): number { + // CEP-8 TTL is in seconds. If TTL is absent, default is 5 minutes. + const ttlSeconds = params.ttlSeconds; + if (ttlSeconds === undefined) { + return 5 * 60 * 1000; + } + if (!Number.isFinite(ttlSeconds) || ttlSeconds <= 0) { + return 5 * 60 * 1000; + } + return Math.floor(ttlSeconds * 1000); +} + +export function matchPricedCapability( + message: JSONRPCRequest, + priced: readonly PricedCapability[], +): PricedCapability | undefined { + const capabilityName = getCapabilityNameForPricing(message); + + return priced.find((p) => { + if (p.method !== message.method) return false; + if (p.name === undefined) return true; + return p.name === capabilityName; + }); +} + +export function getCapabilityNameForPricing( + message: JSONRPCRequest, +): string | undefined { + const params = message.params as Record | undefined; + + switch (message.method) { + case 'tools/call': { + const name = params?.name; + return typeof name === 'string' ? name : undefined; + } + case 'prompts/get': { + const name = params?.name; + return typeof name === 'string' ? name : undefined; + } + case 'resources/read': { + const uri = params?.uri; + return typeof uri === 'string' ? uri : undefined; + } + default: + return undefined; + } +} + +export function isResolvePriceRejection( + quote: ResolvePriceResult, +): quote is ResolvePriceRejection { + return 'reject' in quote && quote.reject; +} + +export function isResolvePriceWaiver( + quote: ResolvePriceResult, +): quote is ResolvePriceWaiver { + return 'waive' in quote && quote.waive; +} diff --git a/src/payments/server-payments.ts b/src/payments/server-payments.ts index 4149f78..53a8cc8 100644 --- a/src/payments/server-payments.ts +++ b/src/payments/server-payments.ts @@ -1,17 +1,15 @@ import { type JSONRPCRequest } from '@contextvm/mcp-sdk/types.js'; -import { +import { isJsonRpcRequest } from './types.js'; +import type { CorrelatedNotificationSender, PaymentAcceptedNotification, PaymentProcessor, PaymentRejectedNotification, PaymentRequiredNotification, PricedCapability, - ResolvePriceRejection, - ResolvePriceWaiver, - ResolvePriceResult, ResolvePriceFn, ServerMiddlewareFn, - isJsonRpcRequest, + PaymentInteractionMode, } from './types.js'; import { LruCache } from '../core/utils/lru-cache.js'; import { withTimeout } from '../core/utils/utils.js'; @@ -22,6 +20,13 @@ import { PAYMENT_REJECTED_METHOD, PAYMENT_REQUIRED_METHOD, } from './constants.js'; +import { + getVerificationTimeoutMs, + matchPricedCapability, + isResolvePriceRejection, + isResolvePriceWaiver, +} from './server-payments-utils.js'; + export interface ServerPaymentsOptions { processors: readonly PaymentProcessor[]; @@ -47,6 +52,9 @@ export interface ServerPaymentsOptions { * @default 1000 */ maxPendingPayments?: number; + + /** Effective payment interaction mode for this server instance. @default 'transparent' */ + paymentInteraction?: PaymentInteractionMode; } function purgeExpiredPending(params: { @@ -71,55 +79,7 @@ type PendingPaymentState = { inFlight: Promise; }; -function getVerificationTimeoutMs(params: { - ttlSeconds: number | undefined; -}): number { - // CEP-8 TTL is in seconds. If TTL is absent, default is 5 minutes. - const ttlSeconds = params.ttlSeconds; - if (ttlSeconds === undefined) { - return 5 * 60 * 1000; - } - if (!Number.isFinite(ttlSeconds) || ttlSeconds <= 0) { - return 5 * 60 * 1000; - } - return Math.floor(ttlSeconds * 1000); -} - -function matchPricedCapability( - message: JSONRPCRequest, - priced: readonly PricedCapability[], -): PricedCapability | undefined { - const capabilityName = getCapabilityNameForPricing(message); - - return priced.find((p) => { - if (p.method !== message.method) return false; - if (p.name === undefined) return true; - return p.name === capabilityName; - }); -} -function getCapabilityNameForPricing( - message: JSONRPCRequest, -): string | undefined { - const params = message.params as Record | undefined; - - switch (message.method) { - case 'tools/call': { - const name = params?.name; - return typeof name === 'string' ? name : undefined; - } - case 'prompts/get': { - const name = params?.name; - return typeof name === 'string' ? name : undefined; - } - case 'resources/read': { - const uri = params?.uri; - return typeof uri === 'string' ? uri : undefined; - } - default: - return undefined; - } -} function createPaymentRequiredNotification(params: { amount: number; @@ -160,17 +120,7 @@ function createPaymentRejectedNotification(params: { }; } -function isResolvePriceRejection( - quote: ResolvePriceResult, -): quote is ResolvePriceRejection { - return 'reject' in quote && quote.reject; -} -function isResolvePriceWaiver( - quote: ResolvePriceResult, -): quote is ResolvePriceWaiver { - return 'waive' in quote && quote.waive; -} /** * Creates a server-side middleware that gates priced requests until payment is verified. diff --git a/src/payments/server-transport-payments.ts b/src/payments/server-transport-payments.ts index 66ae160..6aef7df 100644 --- a/src/payments/server-transport-payments.ts +++ b/src/payments/server-transport-payments.ts @@ -3,6 +3,8 @@ import type { ServerPaymentsOptions } from './server-payments.js'; import { createCapTagsFromPricedCapabilities } from './cap-tags.js'; import { createPmiTagsFromProcessors } from './pmi-tags.js'; import { createServerPaymentsMiddleware } from './server-payments.js'; +import { createExplicitGatingMiddleware } from './server-explicit-gating.js'; +import { AuthorizationStore } from './authorization-store.js'; /** * Attaches CEP-8 payments gating to a NostrServerTransport. @@ -12,15 +14,35 @@ export function withServerPayments( options: ServerPaymentsOptions, ): NostrServerTransport { // CEP-8 discovery tags: advertise supported PMIs + reference pricing on announcement/list events. - transport.setAnnouncementExtraTags( - createPmiTagsFromProcessors(options.processors), - ); + const extraTags = createPmiTagsFromProcessors(options.processors); + + if (options.paymentInteraction === 'explicit_gating') { + extraTags.push(['payment_interaction', 'explicit_gating']); + } + + transport.setAnnouncementExtraTags(extraTags); transport.setAnnouncementPricingTags( createCapTagsFromPricedCapabilities(options.pricedCapabilities), ); - transport.addInboundMiddleware( - createServerPaymentsMiddleware({ sender: transport, options }), - ); + // Expose the configured payment interaction mode to the transport coordinator. + transport.setSupportedPaymentInteraction(options.paymentInteraction); + + if (options.paymentInteraction === 'explicit_gating') { + const authorizationStore = new AuthorizationStore({}); + transport.addInboundMiddleware( + createExplicitGatingMiddleware({ + options, + authorizationStore, + sendResponse: async (clientPubkey, response, requestEventId) => { + await transport.send(response); + }, + }), + ); + } else { + transport.addInboundMiddleware( + createServerPaymentsMiddleware({ sender: transport, options }), + ); + } return transport; } diff --git a/src/payments/types.ts b/src/payments/types.ts index 682f632..395eac0 100644 --- a/src/payments/types.ts +++ b/src/payments/types.ts @@ -62,6 +62,48 @@ export type PaymentRequiredNotification = JSONRPCNotification & { }; }; +/** CEP-8 payment interaction modes. */ +export type PaymentInteractionMode = 'transparent' | 'explicit_gating'; + +/** A single payment option inside a -32042 error.data.payment_options entry. */ +export interface PaymentOption { + amount: number; + pmi: string; + pay_req: string; + description?: string; + ttl?: number; + _meta?: Record; +} + +/** Shape of error.data for -32042 Payment Required. */ +export interface PaymentRequiredErrorData { + instructions?: string; + payment_options: PaymentOption[]; +} + +/** Shape of error.data for -32043 Payment Pending. */ +export interface PaymentPendingErrorData { + instructions?: string; + retry_after?: number; +} + +/** Nostr `payment_interaction` tag as defined by CEP-8. */ +export type PaymentInteractionTag = ['payment_interaction', PaymentInteractionMode]; + +/** + * Canonical invocation identity for explicit-gating authorization matching. + * + * `invocationHash` is SHA-256 over JCS({method, params}). This means `params` MUST be + * deterministic — no timestamps, UUIDs, or ephemeral IDs that change across retries. + * Clients MUST preserve the exact original `params` object when retrying after payment + * so the retry computes the same `invocationHash` and matches the paid authorization. + */ +export interface CanonicalInvocationIdentity { + clientPubkey: string; + /** Hex-encoded SHA-256 of JCS({method, params}). */ + invocationHash: string; +} + /** A CEP-8 payment-accepted notification (JSON-RPC notification). */ export type PaymentAcceptedNotification = JSONRPCNotification & { method: 'notifications/payment_accepted'; diff --git a/src/transport/capability-negotiator.ts b/src/transport/capability-negotiator.ts index cae603b..ad118e9 100644 --- a/src/transport/capability-negotiator.ts +++ b/src/transport/capability-negotiator.ts @@ -180,6 +180,7 @@ export class ServerCapabilityNegotiator { export class ClientCapabilityNegotiator { private hasSentDiscoveryTags = false; private clientPmis?: readonly string[]; + private paymentInteraction?: import('../payments/types.js').PaymentInteractionMode; private serverSupportsEphemeralGiftWraps = false; private _serverInitializeEvent?: NostrEvent; @@ -204,6 +205,13 @@ export class ClientCapabilityNegotiator { this.clientPmis = pmis; } + /** + * Sets the requested payment interaction mode for negotiation. + */ + public setPaymentInteraction(mode: import('../payments/types.js').PaymentInteractionMode): void { + this.paymentInteraction = mode; + } + /** * Updates server capability flags from discovered peer tags. * Called by the transport when it learns new capabilities from inbound events. @@ -253,6 +261,9 @@ export class ClientCapabilityNegotiator { if (this.clientPmis) { tags.push(...this.clientPmis.map((pmi) => ['pmi', pmi])); } + if (this.paymentInteraction && this.paymentInteraction !== 'transparent') { + tags.push(['payment_interaction', this.paymentInteraction]); + } return tags; } diff --git a/src/transport/middleware.ts b/src/transport/middleware.ts index b62f8b4..2abb0dc 100644 --- a/src/transport/middleware.ts +++ b/src/transport/middleware.ts @@ -1,10 +1,22 @@ import type { JSONRPCMessage } from '@contextvm/mcp-sdk/types.js'; +import type { PaymentInteractionMode } from '../payments/types.js'; + /** * Inbound middleware hook for server transports. + * + * @note Context relationship: `InboundMiddlewareFn`'s `ctx` is the authoritative source + * of per-request context, populated by the inbound coordinator from the session and + * inbound event tags. `ServerPaymentsContext` (used by `ServerMiddlewareFn`) is a subset + * of this context — it reads the same `paymentInteraction` field. The inbound coordinator + * constructs both from the same session state, so they stay synchronized automatically. */ export type InboundMiddlewareFn = ( message: JSONRPCMessage, - ctx: { clientPubkey: string; clientPmis?: readonly string[] }, + ctx: { + clientPubkey: string; + clientPmis?: readonly string[]; + paymentInteraction?: PaymentInteractionMode; + }, forward: (message: JSONRPCMessage) => Promise, ) => Promise; diff --git a/src/transport/nostr-client-transport.ts b/src/transport/nostr-client-transport.ts index ca9cc18..fec0d71 100644 --- a/src/transport/nostr-client-transport.ts +++ b/src/transport/nostr-client-transport.ts @@ -584,6 +584,20 @@ export class NostrClientTransport return this.metadataStore.getServerInitializePicture(); } + /** + * Sets the requested payment interaction mode for negotiation. + */ + public setPaymentInteraction(mode: import('../payments/types.js').PaymentInteractionMode): void { + this.capabilityNegotiator.setPaymentInteraction(mode); + } + + /** + * Gets the effective payment interaction mode disclosed by the server. + */ + public getEffectivePaymentInteraction(): import('../payments/types.js').PaymentInteractionMode | undefined { + return this.metadataStore.getEffectivePaymentInteraction(); + } + /** Gets the server's most recently observed tools/list event envelope, if any. */ public getServerToolsListEvent(): NostrEvent | undefined { return this.metadataStore.getServerToolsListEvent(); @@ -628,6 +642,7 @@ export class NostrClientTransport private handleResponse( correlatedEventId: string, mcpMessage: JSONRPCMessage, + eventId?: string, ): void { try { const resolved = this.correlationStore.resolveResponse( @@ -637,6 +652,10 @@ export class NostrClientTransport if (resolved) { this.onmessage?.(mcpMessage); + this.onmessageWithContext?.(mcpMessage, { + eventId: eventId ?? correlatedEventId, + correlatedEventId, + }); } else { this.logger.warn('Response for unknown request', { eventId: correlatedEventId, diff --git a/src/transport/nostr-client/correlation-store.ts b/src/transport/nostr-client/correlation-store.ts index f422bac..1285255 100644 --- a/src/transport/nostr-client/correlation-store.ts +++ b/src/transport/nostr-client/correlation-store.ts @@ -15,6 +15,8 @@ export interface PendingRequest { progressToken?: string; /** Minimal context about the original request (safe to store; no arguments). */ originalRequestContext?: OriginalRequestContext; + /** The full raw original JSON-RPC request for explicit gating retries. */ + rawRequest?: import('@modelcontextprotocol/sdk/types.js').JSONRPCRequest; } /** @@ -74,6 +76,13 @@ export class ClientCorrelationStore { return this.pendingRequests.get(eventId); } + /** + * Gets the raw original JSON-RPC request for explicit gating retries. + */ + getRawRequest(eventId: string): import('@modelcontextprotocol/sdk/types.js').JSONRPCRequest | undefined { + return this.pendingRequests.get(eventId)?.rawRequest; + } + /** * Resolves a response by finding and removing the corresponding request. * Restores the original request ID in the response before resolving. diff --git a/src/transport/nostr-client/inbound-coordinator.ts b/src/transport/nostr-client/inbound-coordinator.ts index 353cb97..d66920e 100644 --- a/src/transport/nostr-client/inbound-coordinator.ts +++ b/src/transport/nostr-client/inbound-coordinator.ts @@ -144,7 +144,7 @@ export class ClientInboundCoordinator { } } - this.deps.handleResponse(eTag, mcpMessage); + this.deps.handleResponse(eTag, mcpMessage, nostrEvent.id); return; } @@ -206,6 +206,15 @@ export class ClientInboundCoordinator { return; } + const paymentInteractionTag = event.tags.find( + (tag) => tag[0] === 'payment_interaction' && typeof tag[1] === 'string' + ); + if (paymentInteractionTag) { + this.deps.metadataStore.setEffectivePaymentInteraction( + paymentInteractionTag[1] as import('../../payments/types.js').PaymentInteractionMode + ); + } + const currentHasInitializeResult = InitializeResultSchema.safeParse( this.getInitializeResultCandidate(event), ).success; diff --git a/src/transport/nostr-client/outbound-sender.ts b/src/transport/nostr-client/outbound-sender.ts index 733b45e..02e5401 100644 --- a/src/transport/nostr-client/outbound-sender.ts +++ b/src/transport/nostr-client/outbound-sender.ts @@ -146,6 +146,7 @@ export class ClientOutboundSender { progressToken: progressToken !== undefined ? String(progressToken) : undefined, originalRequestContext, + rawRequest: isRequest ? (message as import('@modelcontextprotocol/sdk/types.js').JSONRPCRequest) : undefined, }); }, giftWrapKind, @@ -213,6 +214,7 @@ export class ClientOutboundSender { progressToken, originalRequestContext: this.deps.getOriginalRequestContext(originalMessage), + rawRequest: originalMessage as import('@modelcontextprotocol/sdk/types.js').JSONRPCRequest, }); } diff --git a/src/transport/nostr-client/server-metadata-store.ts b/src/transport/nostr-client/server-metadata-store.ts index 0d8c5a1..b9041f1 100644 --- a/src/transport/nostr-client/server-metadata-store.ts +++ b/src/transport/nostr-client/server-metadata-store.ts @@ -20,6 +20,15 @@ export class ServerMetadataStore { private serverResourceTemplatesListEvent: NostrEvent | undefined; private supportsOversizedTransfer = false; private supportsOpenStream = false; + private effectivePaymentInteraction?: import('../../payments/types.js').PaymentInteractionMode; + + public setEffectivePaymentInteraction(mode: import('../../payments/types.js').PaymentInteractionMode): void { + this.effectivePaymentInteraction = mode; + } + + public getEffectivePaymentInteraction(): import('../../payments/types.js').PaymentInteractionMode | undefined { + return this.effectivePaymentInteraction; + } public clear(): void { this.serverInitializeEvent = undefined; @@ -29,6 +38,7 @@ export class ServerMetadataStore { this.serverResourceTemplatesListEvent = undefined; this.supportsOversizedTransfer = false; this.supportsOpenStream = false; + this.effectivePaymentInteraction = undefined; } public setServerInitializeEvent(event: NostrEvent): void { diff --git a/src/transport/nostr-server-transport.ts b/src/transport/nostr-server-transport.ts index 51b9a65..43d75f2 100644 --- a/src/transport/nostr-server-transport.ts +++ b/src/transport/nostr-server-transport.ts @@ -487,6 +487,13 @@ export class NostrServerTransport this.listToolsResultTransformers.push(transformer); } + /** + * Sets the supported payment interaction mode for this server. + */ + public setSupportedPaymentInteraction(mode: import('../payments/types.js').PaymentInteractionMode | undefined): void { + this.inboundCoordinator.setSupportedPaymentInteraction(mode); + } + /** * Adds a provider for extra tags on public tools/list announcement events. */ diff --git a/src/transport/nostr-server/inbound-coordinator.ts b/src/transport/nostr-server/inbound-coordinator.ts index bd9baea..5381de4 100644 --- a/src/transport/nostr-server/inbound-coordinator.ts +++ b/src/transport/nostr-server/inbound-coordinator.ts @@ -38,6 +38,7 @@ export interface ServerInboundCoordinatorDeps { oversizedEnabled: boolean; openStreamEnabled: boolean; giftWrapMode: GiftWrapMode; + supportedPaymentInteraction?: import('../../payments/types.js').PaymentInteractionMode; sendMcpMessage: ( msg: JSONRPCMessage, pubkey: string, @@ -75,6 +76,10 @@ export class ServerInboundCoordinator { this.inboundNotificationDispatcher = dispatcher; } + public setSupportedPaymentInteraction(mode: import('../../payments/types.js').PaymentInteractionMode | undefined): void { + this.deps.supportedPaymentInteraction = mode; + } + /** * Authorizes and processes an incoming Nostr event, handling message validation, * client authorization, session management, and optional client public key injection. @@ -164,9 +169,25 @@ export class ServerInboundCoordinator { const clientPmis = event.tags .filter((tag) => tag[0] === 'pmi' && typeof tag[1] === 'string') .map((tag) => tag[1] as string); + + const serverSupportsExplicitGating = + this.deps.supportedPaymentInteraction === 'explicit_gating'; + + const paymentInteractionTag = event.tags.find( + (tag) => tag[0] === 'payment_interaction' && typeof tag[1] === 'string' + ); + + if (paymentInteractionTag && !session.requestedPaymentInteraction) { + session.requestedPaymentInteraction = paymentInteractionTag[1] as import('../../payments/types.js').PaymentInteractionMode; + session.effectivePaymentInteraction = serverSupportsExplicitGating + ? session.requestedPaymentInteraction + : 'transparent'; + } + const ctx = { clientPubkey: event.pubkey, clientPmis: clientPmis.length > 0 ? clientPmis : undefined, + paymentInteraction: session.effectivePaymentInteraction, }; const middlewares = this.deps.inboundMiddlewares; diff --git a/src/transport/nostr-server/outbound-response-router.ts b/src/transport/nostr-server/outbound-response-router.ts index 5f35678..27a0c51 100644 --- a/src/transport/nostr-server/outbound-response-router.ts +++ b/src/transport/nostr-server/outbound-response-router.ts @@ -229,6 +229,17 @@ export class OutboundResponseRouter { baseTags: this.deps.createResponseTags(route.clientPubkey, nostrEventId), session, }); + + // CEP-8: Disclose effective mode on first response if client requested a non-default mode + if ( + session.requestedPaymentInteraction && + session.requestedPaymentInteraction !== 'transparent' && + !session.hasDisclosedPaymentInteraction && + session.effectivePaymentInteraction + ) { + tags.push(['payment_interaction', session.effectivePaymentInteraction]); + session.hasDisclosedPaymentInteraction = true; + } const giftWrapKind = this.deps.chooseGiftWrapKind({ session, diff --git a/src/transport/nostr-server/session-store.ts b/src/transport/nostr-server/session-store.ts index e911c1b..881f308 100644 --- a/src/transport/nostr-server/session-store.ts +++ b/src/transport/nostr-server/session-store.ts @@ -26,6 +26,12 @@ export interface ClientSession { supportsOversizedTransfer: boolean; /** Whether the client has advertised CEP-41 open stream support. */ supportsOpenStream: boolean; + /** Client-requested payment interaction mode (from first message). */ + requestedPaymentInteraction?: import('../../payments/types.js').PaymentInteractionMode; + /** Effective payment interaction mode for this session. */ + effectivePaymentInteraction?: import('../../payments/types.js').PaymentInteractionMode; + /** Whether the effective mode has been disclosed on the first response. */ + hasDisclosedPaymentInteraction?: boolean; } /** diff --git a/src/transport/payments-flow.test.ts b/src/transport/payments-flow.test.ts index 1c9b12e..1643509 100644 --- a/src/transport/payments-flow.test.ts +++ b/src/transport/payments-flow.test.ts @@ -1009,4 +1009,91 @@ describe.serial('payments fake flow (transport-level)', () => { await client.close(); await mcpServer.close(); }, 20000); + + test('explicit gating: gates tools/call via -32042 error and auto-retries', async () => { + const serverSK = generateSecretKey(); + const serverPrivateKey = bytesToHex(serverSK); + const serverPublicKey = getPublicKey(serverSK); + + const mcpServer = new McpServer({ name: 'explicit-server', version: '1.0.0' }); + let toolCallCount = 0; + mcpServer.registerTool( + 'add', + { + title: 'Addition Tool', + description: 'Add two numbers', + inputSchema: { a: z.number(), b: z.number() }, + }, + async ({ a, b }: { a: number; b: number }) => { + toolCallCount++; + return { content: [{ type: 'text', text: String(a + b) }] }; + }, + ); + + const processor = new FakePaymentProcessor({ verifyDelayMs: 20 }); + const pricedCapabilities = [ + { + method: 'tools/call', + name: 'add', + amount: 1, + currencyUnit: 'test', + description: 'explicit test payment', + }, + ] as const; + + const serverTransport = withServerPayments( + new NostrServerTransport({ + signer: new PrivateKeySigner(serverPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + encryptionMode: EncryptionMode.DISABLED, + }), + { + processors: [processor], + pricedCapabilities: [...pricedCapabilities], + paymentInteraction: 'explicit_gating', + }, + ); + + await mcpServer.connect(serverTransport); + + const clientSK = generateSecretKey(); + const clientPrivateKey = bytesToHex(clientSK); + + // Track if onPaymentRequired was called + let explicitPaymentHandled = false; + + const clientTransport = new NostrClientTransport({ + signer: new PrivateKeySigner(clientPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + serverPubkey: serverPublicKey, + encryptionMode: EncryptionMode.DISABLED, + }); + const paidClientTransport = withClientPayments(clientTransport, { + handlers: [new FakePaymentHandler({ delayMs: 20 })], + paymentInteraction: 'explicit_gating', + onPaymentRequired: async () => { + explicitPaymentHandled = true; + return { paid: true }; + } + }); + + const client = new Client({ name: 'explicit-client', version: '1.0.0' }); + await client.connect(paidClientTransport); + + const result = await client.callTool({ + name: 'add', + arguments: { a: 10, b: 20 }, + }); + + const typedResult = result as { + content: Array<{ type: string; text?: string }>; + }; + expect(typedResult.content[0]).toMatchObject({ type: 'text', text: '30' }); + + expect(explicitPaymentHandled).toBe(true); + expect(toolCallCount).toBe(1); + + await client.close(); + await mcpServer.close(); + }, 20000); }); From 0f3b0820d8246cebd10bad541e0a757b6a47e041 Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Thu, 11 Jun 2026 16:57:22 +0530 Subject: [PATCH 02/19] fix: address code review findings for explicit gating --- src/payments/authorization-store.test.ts | 12 ++--- src/payments/authorization-store.ts | 17 ++++++ src/payments/client-payments.ts | 52 +++++++++++++------ src/payments/server-explicit-gating.ts | 6 +-- .../nostr-client/inbound-coordinator.ts | 11 ++-- .../nostr-server/inbound-coordinator.ts | 14 +++-- 6 files changed, 79 insertions(+), 33 deletions(-) diff --git a/src/payments/authorization-store.test.ts b/src/payments/authorization-store.test.ts index 782c56e..75ba365 100644 --- a/src/payments/authorization-store.test.ts +++ b/src/payments/authorization-store.test.ts @@ -32,9 +32,9 @@ describe('AuthorizationStore', () => { test('claim fails after TTL expires', async () => { const store = new AuthorizationStore(); - store.grant(identity, 10); + store.grant(identity, 50); - await new Promise((resolve) => setTimeout(resolve, 15)); + await new Promise((resolve) => setTimeout(resolve, 75)); expect(store.claim(identity)).toBe(false); }); @@ -66,12 +66,12 @@ describe('AuthorizationStore', () => { test('trySetPending allows setting again after pending state expires', async () => { const store = new AuthorizationStore(); - expect(store.trySetPending(identity, 10)).toBe(true); - expect(store.trySetPending(identity, 10)).toBe(false); + expect(store.trySetPending(identity, 50)).toBe(true); + expect(store.trySetPending(identity, 50)).toBe(false); - await new Promise((resolve) => setTimeout(resolve, 15)); + await new Promise((resolve) => setTimeout(resolve, 75)); - expect(store.trySetPending(identity, 10)).toBe(true); + expect(store.trySetPending(identity, 50)).toBe(true); }); test('grant clears pending state', () => { diff --git a/src/payments/authorization-store.ts b/src/payments/authorization-store.ts index e81e05c..e974953 100644 --- a/src/payments/authorization-store.ts +++ b/src/payments/authorization-store.ts @@ -14,6 +14,11 @@ export interface PaidAuthorization { * A bounded, TTL-aware store for explicit gating authorizations. * It manages both the pending state (waiting for payment verification) * and the granted state (paid and ready to consume). + * + * NOTE: The atomicity provided by `trySetPending` relies on in-memory maps, + * meaning it is strictly single-process. For multi-process horizontal scaling, + * implementers should use a distributed lock (e.g. Redis Redlock) keyed by + * the canonical invocation identity to prevent duplicate payments. */ export class AuthorizationStore { private readonly authorizations: LruCache; @@ -79,6 +84,8 @@ export class AuthorizationStore { if (auth.remaining === 0) { this.authorizations.delete(key); } else { + // Explicitly delete and set to guarantee LRU position is refreshed + this.authorizations.delete(key); this.authorizations.set(key, auth); } this.logger.debug('authorization claimed', { key, remaining: auth.remaining }); @@ -96,6 +103,7 @@ export class AuthorizationStore { * * This atomic check-and-set prevents concurrent requests from both receiving * -32042 and triggering duplicate payment flows. + * NOTE: This is single-process only. Distributed setups must use an external lock. */ public trySetPending(identity: CanonicalInvocationIdentity, ttlMs: number): boolean { const key = this.getKey(identity); @@ -134,6 +142,15 @@ export class AuthorizationStore { return true; } + /** Gets the remaining TTL in milliseconds for a pending authorization, or 0 if not pending. */ + public getPendingRemainingMs(identity: CanonicalInvocationIdentity): number { + const key = this.getKey(identity); + const expiry = this.pending.get(key); + if (expiry === undefined) return 0; + const remaining = expiry - Date.now(); + return remaining > 0 ? remaining : 0; + } + /** Clears pending state (e.g. on verification failure or expiry). */ public clearPending(identity: CanonicalInvocationIdentity): void { const key = this.getKey(identity); diff --git a/src/payments/client-payments.ts b/src/payments/client-payments.ts index 5c2e115..c2c3ade 100644 --- a/src/payments/client-payments.ts +++ b/src/payments/client-payments.ts @@ -215,12 +215,20 @@ export function withClientPayments( maybeStopScheduler(); }; + const pendingTimers = new Set>(); + const retryCounts = new Map(); + const MAX_RETRIES = 5; + const stopAllSyntheticProgress = (): void => { syntheticProgress.clear(); if (syntheticProgressScheduler) { clearInterval(syntheticProgressScheduler); syntheticProgressScheduler = undefined; } + for (const timer of pendingTimers) { + clearTimeout(timer); + } + pendingTimers.clear(); }; // Ensure CEP-8 discovery/negotiation: when using Nostr transports, always advertise @@ -335,11 +343,8 @@ export function withClientPayments( }); try { - await handler.handle(request); - logger.info('payment handler succeeded, retrying request', { - requestEventId, - pmi: option.pmi, - }); + // In explicit gating, we do NOT call handler.handle(request) directly. + // Instead, we delegate entirely to options.onPaymentRequired. // In explicit gating, the client MUST retry the exact same request // to trigger authorization consumption and get the result. @@ -362,7 +367,8 @@ export function withClientPayments( return; } - const rawRequest = transport.correlationStore.getRawRequest(requestEventId); + const nostrTransport = transport as NostrClientTransport; + const rawRequest = nostrTransport.correlationStore.getRawRequest(requestEventId); if (!rawRequest) { logger.warn('missing raw original request, cannot retry explicit payment', { requestEventId }); onmessage?.(message); @@ -375,14 +381,15 @@ export function withClientPayments( originalRequest: rawRequest, }); - if (result.paid) { - logger.info('explicit payment satisfied, retrying original request', { - requestEventId, - method: rawRequest.method, - }); - - // Re-send the exact request, updating the ID if necessary (or letting MCP SDK handle it) - // But actually we are the transport, we can just resend the raw request through the transport. + if (result.paid) { + // Only if they successfully paid via onPaymentRequired do we proceed to retry + logger.info('explicit payment satisfied, retrying original request', { + requestEventId, + method: rawRequest.method, + }); + + // Re-send the exact request, updating the ID if necessary (or letting MCP SDK handle it) + // But actually we are the transport, we can just resend the raw request through the transport. // Wait, we need to create a new ID so the proxy can track it properly. // Oh right, we can't easily resend and magically stitch it back to the original Promise in the MCP Client. // Actually, if we just send() it, the original promise in the MCP Client is already waiting @@ -470,23 +477,36 @@ export function withClientPayments( return; } - const rawRequest = transport.correlationStore.getRawRequest(requestEventId); + const nostrTransport = transport as NostrClientTransport; + const rawRequest = nostrTransport.correlationStore.getRawRequest(requestEventId); if (!rawRequest) { logger.warn('missing raw original request, cannot retry explicit payment pending', { requestEventId }); onmessage?.(message); return; } + const retries = retryCounts.get(requestEventId) ?? 0; + if (retries >= MAX_RETRIES) { + logger.error('max explicit payment retries exceeded', { requestEventId, maxRetries: MAX_RETRIES }); + onmessage?.(message); + return; + } + + retryCounts.set(requestEventId, retries + 1); + logger.info('payment pending, retrying after backoff', { requestEventId, retryAfterSeconds, + retryCount: retries + 1, }); - setTimeout(() => { + const timer = setTimeout(() => { + pendingTimers.delete(timer); transport.send(rawRequest).catch(err => { logger.error('failed to retry pending request', { requestEventId, error: err instanceof Error ? err.message : String(err) }); }); }, retryAfterSeconds * 1000); + pendingTimers.add(timer); return; // Intercept the error so the client waits } diff --git a/src/payments/server-explicit-gating.ts b/src/payments/server-explicit-gating.ts index 6186034..604554d 100644 --- a/src/payments/server-explicit-gating.ts +++ b/src/payments/server-explicit-gating.ts @@ -83,7 +83,7 @@ export function createExplicitGatingMiddleware( message: 'Payment Pending', data: { instructions: 'A payment is already pending for this invocation. Wait and retry.', - retry_after: 5, + retry_after: Math.ceil(authorizationStore.getPendingRemainingMs(identity) / 1000) || 5, }, }, }; @@ -175,8 +175,8 @@ export function createExplicitGatingMiddleware( }); const effectiveTimeoutMs = Math.min(verifyTimeoutMs, paymentTtlMs); - // Update pending with the precise TTL - authorizationStore.trySetPending(identity, effectiveTimeoutMs); + // Note: Pending TTL was set to paymentTtlMs at line 74, which is >= effectiveTimeoutMs + // This ensures pending state covers the entire verification period. const errorResponse: JSONRPCErrorResponse = { jsonrpc: '2.0', diff --git a/src/transport/nostr-client/inbound-coordinator.ts b/src/transport/nostr-client/inbound-coordinator.ts index d66920e..5b8da6d 100644 --- a/src/transport/nostr-client/inbound-coordinator.ts +++ b/src/transport/nostr-client/inbound-coordinator.ts @@ -28,7 +28,7 @@ export interface ClientInboundCoordinatorDeps { metadataStore: ServerMetadataStore; unwrapEvent: (event: NostrEvent) => Promise; convertNostrEventToMcpMessage: (event: NostrEvent) => JSONRPCMessage | null; - handleResponse: (correlatedEventId: string, msg: JSONRPCMessage) => void; + handleResponse: (correlatedEventId: string, msg: JSONRPCMessage, eventId?: string) => void; handleNotification: ( eventId: string, correlatedEventId: string | undefined, @@ -210,9 +210,12 @@ export class ClientInboundCoordinator { (tag) => tag[0] === 'payment_interaction' && typeof tag[1] === 'string' ); if (paymentInteractionTag) { - this.deps.metadataStore.setEffectivePaymentInteraction( - paymentInteractionTag[1] as import('../../payments/types.js').PaymentInteractionMode - ); + const mode = paymentInteractionTag[1]; + if (mode === 'transparent' || mode === 'explicit_gating') { + this.deps.metadataStore.setEffectivePaymentInteraction( + mode as import('../../payments/types.js').PaymentInteractionMode + ); + } } const currentHasInitializeResult = InitializeResultSchema.safeParse( diff --git a/src/transport/nostr-server/inbound-coordinator.ts b/src/transport/nostr-server/inbound-coordinator.ts index 5381de4..ef558e6 100644 --- a/src/transport/nostr-server/inbound-coordinator.ts +++ b/src/transport/nostr-server/inbound-coordinator.ts @@ -178,10 +178,16 @@ export class ServerInboundCoordinator { ); if (paymentInteractionTag && !session.requestedPaymentInteraction) { - session.requestedPaymentInteraction = paymentInteractionTag[1] as import('../../payments/types.js').PaymentInteractionMode; - session.effectivePaymentInteraction = serverSupportsExplicitGating - ? session.requestedPaymentInteraction - : 'transparent'; + const mode = paymentInteractionTag[1]; + if (mode === 'transparent' || mode === 'explicit_gating') { + session.requestedPaymentInteraction = mode as import('../../payments/types.js').PaymentInteractionMode; + session.effectivePaymentInteraction = serverSupportsExplicitGating + ? session.requestedPaymentInteraction + : 'transparent'; + } else { + session.requestedPaymentInteraction = 'transparent'; + session.effectivePaymentInteraction = 'transparent'; + } } const ctx = { From 26acaf1ebe9ab104b1ebe74fe70a85c2896fbffd Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Thu, 11 Jun 2026 17:13:08 +0530 Subject: [PATCH 03/19] fix: address PR feedback for explicit gating --- package-lock.json | 5046 +++++++++++++++++ package.json | 1 - src/payments/authorization-store.ts | 10 + src/payments/canonical-identity.ts | 2 +- src/payments/client-payments.ts | 28 +- src/payments/server-explicit-gating.ts | 4 +- src/payments/server-transport-payments.ts | 2 +- src/transport/nostr-server-transport.ts | 17 + .../nostr-server/outbound-response-router.ts | 50 + 9 files changed, 5147 insertions(+), 13 deletions(-) create mode 100644 package-lock.json diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..00d0356 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,5046 @@ +{ + "name": "@contextvm/sdk", + "version": 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+ } + }, + "node_modules/yocto-queue": { + "version": "0.1.0", + "dev": true, + "license": "MIT", + "engines": { + "node": ">=10" + }, + "funding": { + "url": "https://github.com/sponsors/sindresorhus" + } + }, + "node_modules/zod": { + "version": "4.4.3", + "license": "MIT", + "funding": { + "url": "https://github.com/sponsors/colinhacks" + } + }, + "node_modules/zod-to-json-schema": { + "version": "3.25.2", + "license": "ISC", + "peerDependencies": { + "zod": "^3.25.28 || ^4" + } + } + } +} diff --git a/package.json b/package.json index 681e1fd..5ec428f 100644 --- a/package.json +++ b/package.json @@ -106,7 +106,6 @@ "@noble/hashes": "^2.2.0", "applesauce-relay": "^5.2.0", "canonicalize": "^2.1.0", - "json-canonicalize": "^2.0.0", "nostr-tools": "~2.18.2", "pino": "^10.3.1", "rxjs": "^7.8.2", diff --git a/src/payments/authorization-store.ts b/src/payments/authorization-store.ts index e974953..a8fa049 100644 --- a/src/payments/authorization-store.ts +++ b/src/payments/authorization-store.ts @@ -142,6 +142,16 @@ export class AuthorizationStore { return true; } + /** Updates the TTL of an already pending authorization. No-op if not pending. */ + public updatePendingTtl(identity: CanonicalInvocationIdentity, ttlMs: number): void { + const key = this.getKey(identity); + const existingExpiry = this.pending.get(key); + if (existingExpiry !== undefined && Date.now() <= existingExpiry) { + this.pending.set(key, Date.now() + ttlMs); + this.logger.debug('authorization pending TTL updated', { key, ttlMs }); + } + } + /** Gets the remaining TTL in milliseconds for a pending authorization, or 0 if not pending. */ public getPendingRemainingMs(identity: CanonicalInvocationIdentity): number { const key = this.getKey(identity); diff --git a/src/payments/canonical-identity.ts b/src/payments/canonical-identity.ts index 5bf29cb..3d98bdf 100644 --- a/src/payments/canonical-identity.ts +++ b/src/payments/canonical-identity.ts @@ -1,4 +1,4 @@ -import { canonicalize } from 'json-canonicalize'; +import canonicalize from 'canonicalize'; import { createHash } from 'crypto'; import type { CanonicalInvocationIdentity } from './types.js'; diff --git a/src/payments/client-payments.ts b/src/payments/client-payments.ts index c2c3ade..21c695a 100644 --- a/src/payments/client-payments.ts +++ b/src/payments/client-payments.ts @@ -216,7 +216,8 @@ export function withClientPayments( }; const pendingTimers = new Set>(); - const retryCounts = new Map(); + const retryCounts = new Map(); + const rawRequestCache = new Map(); const MAX_RETRIES = 5; const stopAllSyntheticProgress = (): void => { @@ -229,6 +230,8 @@ export function withClientPayments( clearTimeout(timer); } pendingTimers.clear(); + retryCounts.clear(); + rawRequestCache.clear(); }; // Ensure CEP-8 discovery/negotiation: when using Nostr transports, always advertise @@ -367,8 +370,8 @@ export function withClientPayments( return; } - const nostrTransport = transport as NostrClientTransport; - const rawRequest = nostrTransport.correlationStore.getRawRequest(requestEventId); + const requestId = message.id; + const rawRequest = requestId != null ? rawRequestCache.get(requestId) : undefined; if (!rawRequest) { logger.warn('missing raw original request, cannot retry explicit payment', { requestEventId }); onmessage?.(message); @@ -477,22 +480,23 @@ export function withClientPayments( return; } - const nostrTransport = transport as NostrClientTransport; - const rawRequest = nostrTransport.correlationStore.getRawRequest(requestEventId); + const requestId = message.id; + const rawRequest = requestId != null ? rawRequestCache.get(requestId) : undefined; if (!rawRequest) { logger.warn('missing raw original request, cannot retry explicit payment pending', { requestEventId }); onmessage?.(message); return; } - const retries = retryCounts.get(requestEventId) ?? 0; + const requestIdKey = message.id as string | number; + const retries = retryCounts.get(requestIdKey) ?? 0; if (retries >= MAX_RETRIES) { - logger.error('max explicit payment retries exceeded', { requestEventId, maxRetries: MAX_RETRIES }); + logger.error('max explicit payment retries exceeded', { requestEventId, id: requestIdKey, maxRetries: MAX_RETRIES }); onmessage?.(message); return; } - retryCounts.set(requestEventId, retries + 1); + retryCounts.set(requestIdKey, retries + 1); logger.info('payment pending, retrying after backoff', { requestEventId, @@ -736,6 +740,11 @@ export function withClientPayments( isJSONRPCErrorResponse(message) ) { stopSyntheticProgress(String(message.id)); + if (!isExplicitPaymentRequiredError(message) && !isExplicitPaymentPendingError(message)) { + const reqId = message.id as string | number; + rawRequestCache.delete(reqId); + retryCounts.delete(reqId); + } } // Best-effort: execute handler asynchronously, but never block delivery. @@ -823,6 +832,9 @@ export function withClientPayments( }, async send(message: JSONRPCMessage): Promise { + if ('method' in message && 'id' in message && message.id != null) { + rawRequestCache.set(message.id, message as JSONRPCRequest); + } await transport.send(message); }, diff --git a/src/payments/server-explicit-gating.ts b/src/payments/server-explicit-gating.ts index 604554d..46df622 100644 --- a/src/payments/server-explicit-gating.ts +++ b/src/payments/server-explicit-gating.ts @@ -175,8 +175,8 @@ export function createExplicitGatingMiddleware( }); const effectiveTimeoutMs = Math.min(verifyTimeoutMs, paymentTtlMs); - // Note: Pending TTL was set to paymentTtlMs at line 74, which is >= effectiveTimeoutMs - // This ensures pending state covers the entire verification period. + // Update pending with the precise TTL + authorizationStore.updatePendingTtl(identity, effectiveTimeoutMs); const errorResponse: JSONRPCErrorResponse = { jsonrpc: '2.0', diff --git a/src/payments/server-transport-payments.ts b/src/payments/server-transport-payments.ts index 6aef7df..695bc5d 100644 --- a/src/payments/server-transport-payments.ts +++ b/src/payments/server-transport-payments.ts @@ -35,7 +35,7 @@ export function withServerPayments( options, authorizationStore, sendResponse: async (clientPubkey, response, requestEventId) => { - await transport.send(response); + await transport.sendTargetedResponse(clientPubkey, response, requestEventId); }, }), ); diff --git a/src/transport/nostr-server-transport.ts b/src/transport/nostr-server-transport.ts index 43d75f2..9a33063 100644 --- a/src/transport/nostr-server-transport.ts +++ b/src/transport/nostr-server-transport.ts @@ -693,6 +693,23 @@ export class NostrServerTransport await this.outboundResponseRouter.route(response); } + /** + * Sends a targeted response explicitly bypassing the correlation store lookup. + * Useful for middleware that needs to proactively reject requests without + * letting them reach the MCP application. + * + * @param clientPubkey The target client's public key. + * @param response The JSON-RPC response or error to send. + * @param requestEventId The original Nostr event ID of the request being responded to. + */ + public async sendTargetedResponse( + clientPubkey: string, + response: JSONRPCResponse | JSONRPCErrorResponse, + requestEventId: string, + ): Promise { + await this.outboundResponseRouter.routeTargeted(clientPubkey, response, requestEventId); + } + /** * Handles notification messages with routing. * @param notification The JSON-RPC notification to send. diff --git a/src/transport/nostr-server/outbound-response-router.ts b/src/transport/nostr-server/outbound-response-router.ts index 27a0c51..8dac02e 100644 --- a/src/transport/nostr-server/outbound-response-router.ts +++ b/src/transport/nostr-server/outbound-response-router.ts @@ -280,4 +280,54 @@ export class OutboundResponseRouter { throw error; } } + + /** + * Routes a response back to a specifically targeted client and request event. + * This bypasses the normal correlation lookup, which is useful when + * middleware needs to reject a request early (e.g. for explicit gating). + */ + public async routeTargeted( + clientPubkey: string, + response: JSONRPCResponse | JSONRPCErrorResponse, + requestEventId: string, + ): Promise { + const session = this.deps.getSession(clientPubkey); + if (!session) { + this.deps.logger.warn( + 'Cannot route targeted response: no active session found', + { clientPubkey, requestEventId }, + ); + return; + } + + const tags = this.deps.buildOutboundTags({ + baseTags: this.deps.createResponseTags(clientPubkey, requestEventId), + session, + }); + + // CEP-8: Disclose effective mode on first response if client requested a non-default mode + if ( + session.requestedPaymentInteraction && + session.requestedPaymentInteraction !== 'transparent' && + !session.hasDisclosedPaymentInteraction && + session.effectivePaymentInteraction + ) { + tags.push(['payment_interaction', session.effectivePaymentInteraction]); + session.hasDisclosedPaymentInteraction = true; + } + + const giftWrapKind = this.deps.chooseGiftWrapKind({ + session, + }); + + await this.deps.sendMcpMessage( + response, + clientPubkey, + CTXVM_MESSAGES_KIND, + tags, + session.isEncrypted, + undefined, + giftWrapKind, + ); + } } From 670867ece2b4e355810e46b0c639966aca3e6338 Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Thu, 11 Jun 2026 20:18:59 +0530 Subject: [PATCH 04/19] fix(sdk): resolve explicit gating bugs and stabilize tests --- src/payments/authorization-store.test.ts | 46 +++++++++++++++++++ src/payments/authorization-store.ts | 12 ++++- src/payments/canonical-identity.ts | 7 ++- src/payments/client-payments.test.ts | 13 +++++- src/payments/client-payments.ts | 31 ++++++------- src/payments/server-explicit-gating.test.ts | 29 +++++++++++- src/payments/server-explicit-gating.ts | 11 ++++- src/payments/server-transport-payments.ts | 2 +- .../nostr-server/inbound-coordinator.ts | 2 +- .../nostr-server/outbound-response-router.ts | 2 +- src/transport/payments-flow.test.ts | 7 ++- 11 files changed, 136 insertions(+), 26 deletions(-) diff --git a/src/payments/authorization-store.test.ts b/src/payments/authorization-store.test.ts index 75ba365..d5aa150 100644 --- a/src/payments/authorization-store.test.ts +++ b/src/payments/authorization-store.test.ts @@ -101,4 +101,50 @@ describe('AuthorizationStore', () => { expect(store.claim(id2)).toBe(true); expect(store.claim(id3)).toBe(true); }); + + test('pending LRU eviction works when maxEntries is exceeded', () => { + const store = new AuthorizationStore({ maxEntries: 2 }); + + const id1 = { clientPubkey: 'client', invocationHash: 'p1' }; + const id2 = { clientPubkey: 'client', invocationHash: 'p2' }; + const id3 = { clientPubkey: 'client', invocationHash: 'p3' }; + + store.trySetPending(id1, 10000); + store.trySetPending(id2, 10000); + store.trySetPending(id3, 10000); // This should evict id1 + + expect(store.hasPending(id1)).toBe(false); + expect(store.hasPending(id2)).toBe(true); + expect(store.hasPending(id3)).toBe(true); + }); + + test('updatePendingTtl and getPendingRemainingMs behave correctly', async () => { + const store = new AuthorizationStore(); + + // (1) verify getPendingRemainingMs right after trySetPending + expect(store.trySetPending(identity, 100)).toBe(true); + const remainingAfterSet = store.getPendingRemainingMs(identity); + expect(remainingAfterSet).toBeGreaterThan(0); + expect(remainingAfterSet).toBeLessThanOrEqual(100); + + // (2) verify updatePendingTtl extends the pending TTL + store.updatePendingTtl(identity, 500); + const remainingAfterUpdate = store.getPendingRemainingMs(identity); + expect(remainingAfterUpdate).toBeGreaterThan(100); + expect(remainingAfterUpdate).toBeLessThanOrEqual(500); + + // (3) verify getPendingRemainingMs returns 0 after waiting past TTL + await new Promise((resolve) => setTimeout(resolve, 550)); + expect(store.getPendingRemainingMs(identity)).toBe(0); + + // (4) verify updatePendingTtl is a no-op when there is no active pending entry + store.updatePendingTtl(identity, 1000); + expect(store.getPendingRemainingMs(identity)).toBe(0); + + // And after clearPending + store.trySetPending(identity, 1000); + store.clearPending(identity); + store.updatePendingTtl(identity, 1000); + expect(store.getPendingRemainingMs(identity)).toBe(0); + }); }); diff --git a/src/payments/authorization-store.ts b/src/payments/authorization-store.ts index a8fa049..f739e6e 100644 --- a/src/payments/authorization-store.ts +++ b/src/payments/authorization-store.ts @@ -43,6 +43,10 @@ export class AuthorizationStore { ttlMs: number, count: number = 1, ): void { + if (count <= 0) { + throw new RangeError('Authorization count must be greater than 0'); + } + const key = this.getKey(identity); const expiresAtMs = Date.now() + ttlMs; @@ -142,7 +146,13 @@ export class AuthorizationStore { return true; } - /** Updates the TTL of an already pending authorization. No-op if not pending. */ + /** + * Updates the TTL of an already pending authorization. No-op if not pending. + * + * @param identity The canonical invocation identity. + * @param ttlMs The new TTL in milliseconds to apply from now. + * @returns void + */ public updatePendingTtl(identity: CanonicalInvocationIdentity, ttlMs: number): void { const key = this.getKey(identity); const existingExpiry = this.pending.get(key); diff --git a/src/payments/canonical-identity.ts b/src/payments/canonical-identity.ts index 3d98bdf..40fb7cd 100644 --- a/src/payments/canonical-identity.ts +++ b/src/payments/canonical-identity.ts @@ -1,4 +1,6 @@ -import canonicalize from 'canonicalize'; +import canonicalizePackage from 'canonicalize'; +type CanonicalizeFn = (input: unknown) => string | undefined; +const canonicalize = canonicalizePackage as unknown as CanonicalizeFn; import { createHash } from 'crypto'; import type { CanonicalInvocationIdentity } from './types.js'; @@ -17,6 +19,9 @@ export function computeCanonicalInvocationHash( ): string { const payload = { method, params }; const canonicalString = canonicalize(payload); + if (canonicalString === undefined) { + throw new Error('Failed to canonicalize invocation payload'); + } return createHash('sha256') .update(canonicalString) diff --git a/src/payments/client-payments.test.ts b/src/payments/client-payments.test.ts index 83a8126..dcab0d4 100644 --- a/src/payments/client-payments.test.ts +++ b/src/payments/client-payments.test.ts @@ -619,6 +619,10 @@ describe('withClientPayments()', () => { paid.onmessage = (msg) => observed.push(msg); await paid.start(); + // Populate the wrapper's cache with the original request + await paid.send({ jsonrpc: '2.0', id: 77, method: 'tools/call', params: { name: 'test' } }); + sentMessage = undefined; // Reset mock state so we can observe the retry + // Deliver -32042 Payment Required error transport.onmessageWithContext!( { @@ -668,6 +672,9 @@ describe('withClientPayments()', () => { paid.onmessage = (msg) => observed.push(msg); await paid.start(); + // Populate the wrapper's cache with the original request + await paid.send({ jsonrpc: '2.0', id: 88, method: 'tools/call', params: { name: 'test' } }); + // Deliver -32042 Payment Required error transport.onmessageWithContext!( { @@ -691,7 +698,7 @@ describe('withClientPayments()', () => { const errResp = observed[0] as JSONRPCMessage; expect(errResp.id).toBe(88); expect('error' in errResp && errResp.error?.code).toBe(-32042); - expect('error' in errResp && (errResp.error?.data as any)?.reason).toBe('user_cancelled'); + expect('error' in errResp && (errResp.error?.data as { reason?: string })?.reason).toBe('user_cancelled'); await paid.close(); }); @@ -720,6 +727,10 @@ describe('withClientPayments()', () => { paid.onmessage = (msg) => observed.push(msg); await paid.start(); + // Populate the wrapper's cache with the original request + await paid.send({ jsonrpc: '2.0', id: 99, method: 'tools/call', params: { name: 'test_pending' } }); + sentMessage = undefined; // Reset mock state so we can observe the retry + // Deliver -32043 Payment Pending error transport.onmessageWithContext!( { diff --git a/src/payments/client-payments.ts b/src/payments/client-payments.ts index 21c695a..3ecab51 100644 --- a/src/payments/client-payments.ts +++ b/src/payments/client-payments.ts @@ -5,6 +5,7 @@ import { isJSONRPCErrorResponse, JSONRPCNotification, type JSONRPCMessage, + type JSONRPCRequest, } from '@contextvm/mcp-sdk/types.js'; import { NostrClientTransport } from '../transport/nostr-client-transport.js'; import { @@ -118,8 +119,8 @@ function isExplicitPaymentRequiredError( msg.error.code === PAYMENT_REQUIRED_ERROR_CODE && typeof msg.error.data === 'object' && msg.error.data !== null && - Array.isArray((msg.error.data as any).payment_options) && - (msg.error.data as any).payment_options.length > 0 + Array.isArray((msg.error.data as { payment_options?: unknown }).payment_options) && + ((msg.error.data as { payment_options: unknown[] }).payment_options).length > 0 ); } @@ -131,7 +132,7 @@ function isExplicitPaymentPendingError( msg.error.code === PAYMENT_PENDING_ERROR_CODE && typeof msg.error.data === 'object' && msg.error.data !== null && - typeof (msg.error.data as any).retry_after === 'number' + typeof (msg.error.data as { retry_after?: unknown }).retry_after === 'number' ); } @@ -281,7 +282,7 @@ export function withClientPayments( for (const option of data.payment_options) { const handler = handlersByPmi.get(option.pmi); - if (!handler) continue; + if (!handler && !options.onPaymentRequired) continue; const isNostrTransport = transport instanceof NostrClientTransport; const pending = isNostrTransport @@ -297,11 +298,11 @@ export function withClientPayments( return; } - const originalContext = pending + const originalContext = pending?.originalRequestContext ? { - method: pending.method, - capability: pending.capability, - id: pending.id, + method: pending.originalRequestContext.method, + capability: pending.originalRequestContext.capability, + id: pending.originalRequestId, } : undefined; @@ -327,7 +328,7 @@ export function withClientPayments( continue; // Try next option if rejected by policy } - const canHandle = handler.canHandle + const canHandle = handler?.canHandle ? await handler.canHandle(request) : true; @@ -364,12 +365,6 @@ export function withClientPayments( return; } - if (!pending?.originalRequestContext?.method) { - logger.warn('missing original request method, cannot retry explicit payment', { requestEventId }); - onmessage?.(message); - return; - } - const requestId = message.id; const rawRequest = requestId != null ? rawRequestCache.get(requestId) : undefined; if (!rawRequest) { @@ -509,7 +504,7 @@ export function withClientPayments( transport.send(rawRequest).catch(err => { logger.error('failed to retry pending request', { requestEventId, error: err instanceof Error ? err.message : String(err) }); }); - }, retryAfterSeconds * 1000); + }, (retryAfterSeconds ?? 1) * 1000); pendingTimers.add(timer); return; // Intercept the error so the client waits @@ -747,6 +742,10 @@ export function withClientPayments( } } + if (hasContextPath) { + return; + } + // Best-effort: execute handler asynchronously, but never block delivery. void maybeHandlePaymentRequired(message, 'unknown').catch( (err: unknown) => { diff --git a/src/payments/server-explicit-gating.test.ts b/src/payments/server-explicit-gating.test.ts index ecac39d..e26b0e1 100644 --- a/src/payments/server-explicit-gating.test.ts +++ b/src/payments/server-explicit-gating.test.ts @@ -74,7 +74,7 @@ describe('Explicit Gating Middleware', () => { const response = sentResponses[0]; expect(response.error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); - const data = response.error.data as any; + const data = response.error.data as { payment_options: { amount: number; pay_req: string }[] }; expect(data.payment_options.length).toBe(1); expect(data.payment_options[0].amount).toBe(10); expect(data.payment_options[0].pay_req).toBe('pay_req'); @@ -169,4 +169,31 @@ describe('Explicit Gating Middleware', () => { expect(sentResponses.length).toBe(0); expect(forwarded).toBe(true); }); + + test('rejects request immediately if resolvePrice rejects', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [processor], + pricedCapabilities: [...pricedCapabilities], + resolvePrice: async () => ({ reject: true, message: 'Rate limited' }), + }, + authorizationStore: store, + sendResponse: async (pubkey, response) => { + sentResponses.push(response as JSONRPCErrorResponse); + }, + }); + + let forwarded = false; + await mw(message, ctx, async () => { + forwarded = true; + }); + + expect(forwarded).toBe(false); + expect(sentResponses.length).toBe(1); + expect(sentResponses[0].error.code).toBe(-32000); + expect(sentResponses[0].error.message).toBe('Rate limited'); + }); }); diff --git a/src/payments/server-explicit-gating.ts b/src/payments/server-explicit-gating.ts index 46df622..abfe896 100644 --- a/src/payments/server-explicit-gating.ts +++ b/src/payments/server-explicit-gating.ts @@ -83,7 +83,8 @@ export function createExplicitGatingMiddleware( message: 'Payment Pending', data: { instructions: 'A payment is already pending for this invocation. Wait and retry.', - retry_after: Math.ceil(authorizationStore.getPendingRemainingMs(identity) / 1000) || 5, + // Suggest a short polling interval (e.g. 2 seconds) rather than the full TTL + retry_after: Math.min(2, Math.ceil(authorizationStore.getPendingRemainingMs(identity) / 1000)) || 2, }, }, }; @@ -246,7 +247,13 @@ export function createExplicitGatingMiddleware( } finally { controller.abort(); } - })(); + })().catch((err) => { + logger.error('unhandled exception in async payment verification', { + requestEventId, + pmi: paymentRequired.pmi, + error: err instanceof Error ? err.message : String(err), + }); + }); } catch (err) { authorizationStore.clearPending(identity); throw err; diff --git a/src/payments/server-transport-payments.ts b/src/payments/server-transport-payments.ts index 695bc5d..6d3a6cc 100644 --- a/src/payments/server-transport-payments.ts +++ b/src/payments/server-transport-payments.ts @@ -17,7 +17,7 @@ export function withServerPayments( const extraTags = createPmiTagsFromProcessors(options.processors); if (options.paymentInteraction === 'explicit_gating') { - extraTags.push(['payment_interaction', 'explicit_gating']); + extraTags.push(['payment_interaction', 'explicit_gating'] as any); } transport.setAnnouncementExtraTags(extraTags); diff --git a/src/transport/nostr-server/inbound-coordinator.ts b/src/transport/nostr-server/inbound-coordinator.ts index ef558e6..1507231 100644 --- a/src/transport/nostr-server/inbound-coordinator.ts +++ b/src/transport/nostr-server/inbound-coordinator.ts @@ -193,7 +193,7 @@ export class ServerInboundCoordinator { const ctx = { clientPubkey: event.pubkey, clientPmis: clientPmis.length > 0 ? clientPmis : undefined, - paymentInteraction: session.effectivePaymentInteraction, + paymentInteraction: session.effectivePaymentInteraction ?? 'transparent', }; const middlewares = this.deps.inboundMiddlewares; diff --git a/src/transport/nostr-server/outbound-response-router.ts b/src/transport/nostr-server/outbound-response-router.ts index 8dac02e..df4ce3d 100644 --- a/src/transport/nostr-server/outbound-response-router.ts +++ b/src/transport/nostr-server/outbound-response-router.ts @@ -291,7 +291,7 @@ export class OutboundResponseRouter { response: JSONRPCResponse | JSONRPCErrorResponse, requestEventId: string, ): Promise { - const session = this.deps.getSession(clientPubkey); + const session = this.deps.sessionStore.getSession(clientPubkey); if (!session) { this.deps.logger.warn( 'Cannot route targeted response: no active session found', diff --git a/src/transport/payments-flow.test.ts b/src/transport/payments-flow.test.ts index 1643509..00e21bd 100644 --- a/src/transport/payments-flow.test.ts +++ b/src/transport/payments-flow.test.ts @@ -5,6 +5,7 @@ import { describe, expect, test, + spyOn, } from 'bun:test'; import { sleep } from 'bun'; import { Client } from '@contextvm/mcp-sdk/client'; @@ -1031,6 +1032,8 @@ describe.serial('payments fake flow (transport-level)', () => { ); const processor = new FakePaymentProcessor({ verifyDelayMs: 20 }); + const createSpy = spyOn(processor, 'createPaymentRequired'); + const verifySpy = spyOn(processor, 'verifyPayment'); const pricedCapabilities = [ { method: 'tools/call', @@ -1069,7 +1072,7 @@ describe.serial('payments fake flow (transport-level)', () => { encryptionMode: EncryptionMode.DISABLED, }); const paidClientTransport = withClientPayments(clientTransport, { - handlers: [new FakePaymentHandler({ delayMs: 20 })], + handlers: [], paymentInteraction: 'explicit_gating', onPaymentRequired: async () => { explicitPaymentHandled = true; @@ -1092,6 +1095,8 @@ describe.serial('payments fake flow (transport-level)', () => { expect(explicitPaymentHandled).toBe(true); expect(toolCallCount).toBe(1); + expect(createSpy).toHaveBeenCalled(); + expect(verifySpy).toHaveBeenCalled(); await client.close(); await mcpServer.close(); From 89ff84bdd0d33c74e7bfff43f193160f8f2f9be6 Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Thu, 11 Jun 2026 20:39:57 +0530 Subject: [PATCH 05/19] Reseolve minor issue findings --- package-lock.json | 5046 ----------------- src/payments/server-transport-payments.ts | 4 +- .../nostr-server/inbound-coordinator.ts | 38 + 3 files changed, 40 insertions(+), 5048 deletions(-) delete mode 100644 package-lock.json diff --git a/package-lock.json b/package-lock.json deleted file mode 100644 index 00d0356..0000000 --- a/package-lock.json +++ /dev/null @@ -1,5046 +0,0 @@ -{ - 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"is-symbol": "^1.1.1" - }, - "engines": { - "node": ">= 0.4" - }, - "funding": { - "url": "https://github.com/sponsors/ljharb" - } - }, - "node_modules/which-builtin-type": { - "version": "1.2.1", - "dev": true, - "license": "MIT", - "dependencies": { - "call-bound": "^1.0.2", - "function.prototype.name": "^1.1.6", - "has-tostringtag": "^1.0.2", - "is-async-function": "^2.0.0", - "is-date-object": "^1.1.0", - "is-finalizationregistry": "^1.1.0", - "is-generator-function": "^1.0.10", - "is-regex": "^1.2.1", - "is-weakref": "^1.0.2", - "isarray": "^2.0.5", - "which-boxed-primitive": "^1.1.0", - "which-collection": "^1.0.2", - "which-typed-array": "^1.1.16" - }, - "engines": { - "node": ">= 0.4" - }, - "funding": { - "url": "https://github.com/sponsors/ljharb" - } - }, - "node_modules/which-collection": { - "version": "1.0.2", - "dev": true, - "license": "MIT", - "dependencies": { - "is-map": "^2.0.3", - "is-set": "^2.0.3", - "is-weakmap": "^2.0.2", - "is-weakset": "^2.0.3" - }, - "engines": { - "node": ">= 0.4" - }, - "funding": { - "url": "https://github.com/sponsors/ljharb" - } - }, - "node_modules/which-typed-array": { - "version": "1.1.20", - "dev": true, - "license": "MIT", - "dependencies": { - "available-typed-arrays": "^1.0.7", - "call-bind": "^1.0.8", - "call-bound": "^1.0.4", - "for-each": "^0.3.5", - "get-proto": "^1.0.1", - "gopd": "^1.2.0", - "has-tostringtag": "^1.0.2" - }, - "engines": { - "node": ">= 0.4" - }, - "funding": { - "url": "https://github.com/sponsors/ljharb" - } - }, - "node_modules/word-wrap": { - "version": "1.2.5", - "dev": true, - "license": "MIT", - "engines": { - "node": ">=0.10.0" - } - }, - "node_modules/wrappy": { - "version": "1.0.2", - "license": "ISC" - }, - "node_modules/ws": { - "version": "8.20.0", - "license": "MIT", - "engines": { - "node": ">=10.0.0" - }, - "peerDependencies": { - "bufferutil": "^4.0.1", - "utf-8-validate": ">=5.0.2" - }, - "peerDependenciesMeta": { - "bufferutil": { - "optional": true - }, - "utf-8-validate": { - "optional": true - } - } - }, - "node_modules/yocto-queue": { - "version": "0.1.0", - "dev": true, - "license": "MIT", - "engines": { - "node": ">=10" - }, - "funding": { - "url": "https://github.com/sponsors/sindresorhus" - } - }, - "node_modules/zod": { - "version": "4.4.3", - "license": "MIT", - "funding": { - "url": "https://github.com/sponsors/colinhacks" - } - }, - "node_modules/zod-to-json-schema": { - "version": "3.25.2", - "license": "ISC", - "peerDependencies": { - "zod": "^3.25.28 || ^4" - } - } - } -} diff --git a/src/payments/server-transport-payments.ts b/src/payments/server-transport-payments.ts index 6d3a6cc..ca0b1c1 100644 --- a/src/payments/server-transport-payments.ts +++ b/src/payments/server-transport-payments.ts @@ -14,10 +14,10 @@ export function withServerPayments( options: ServerPaymentsOptions, ): NostrServerTransport { // CEP-8 discovery tags: advertise supported PMIs + reference pricing on announcement/list events. - const extraTags = createPmiTagsFromProcessors(options.processors); + const extraTags: string[][] = createPmiTagsFromProcessors(options.processors); if (options.paymentInteraction === 'explicit_gating') { - extraTags.push(['payment_interaction', 'explicit_gating'] as any); + extraTags.push(['payment_interaction', 'explicit_gating']); } transport.setAnnouncementExtraTags(extraTags); diff --git a/src/transport/nostr-server/inbound-coordinator.ts b/src/transport/nostr-server/inbound-coordinator.ts index 1507231..202acb0 100644 --- a/src/transport/nostr-server/inbound-coordinator.ts +++ b/src/transport/nostr-server/inbound-coordinator.ts @@ -26,6 +26,7 @@ import { } from '../../core/index.js'; import { GiftWrapMode } from '../../core/interfaces.js'; import { type OpenStreamWriter } from '../open-stream/index.js'; +import { UNSUPPORTED_PAYMENT_INTERACTION_ERROR_CODE } from '../../payments/constants.js'; export interface ServerInboundCoordinatorDeps { sessionStore: SessionStore; @@ -181,6 +182,43 @@ export class ServerInboundCoordinator { const mode = paymentInteractionTag[1]; if (mode === 'transparent' || mode === 'explicit_gating') { session.requestedPaymentInteraction = mode as import('../../payments/types.js').PaymentInteractionMode; + + if (mode === 'explicit_gating' && !serverSupportsExplicitGating) { + if (isJSONRPCRequest(inboundMessage)) { + const errorResponse: JSONRPCErrorResponse = { + jsonrpc: '2.0', + id: inboundMessage.id, + error: { + code: UNSUPPORTED_PAYMENT_INTERACTION_ERROR_CODE, + message: 'Unsupported payment_interaction mode: explicit_gating', + }, + }; + const tags = this.deps.createResponseTags(event.pubkey, event.id); + this.deps + .sendMcpMessage( + errorResponse, + event.pubkey, + CTXVM_MESSAGES_KIND, + tags, + isEncrypted, + undefined, + isEncrypted + ? this.deps.giftWrapMode === GiftWrapMode.EPHEMERAL + ? EPHEMERAL_GIFT_WRAP_KIND + : this.deps.giftWrapMode === GiftWrapMode.PERSISTENT + ? GIFT_WRAP_KIND + : wrapKind + : undefined, + ) + .catch((err) => { + this.deps.logger.error('Failed to send negotiation error response', { + error: err instanceof Error ? err.message : String(err), + }); + }); + return; + } + } + session.effectivePaymentInteraction = serverSupportsExplicitGating ? session.requestedPaymentInteraction : 'transparent'; From f73b09dd0868b3d6fc5309b7e3af7ca2444c6220 Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Sat, 13 Jun 2026 21:36:52 +0530 Subject: [PATCH 06/19] fix: resolve explicit gating correlation race and CI failures - Fix integration test failure: remove getPendingRequestForEventId() guard from -32042/-32043 handlers. resolveResponse() consumes the correlation entry before the payment wrapper reads it, so the lookup always returned undefined. Use rawRequestCache as the authoritative source for retry requests instead. - Fix TS2769/TS2339 typecheck errors in client-payments.test.ts - Fix TS6133 unused parameter errors in server-explicit-gating.test.ts - Remove as any cast in server-transport-payments.ts - Wire -32602 error in inbound-coordinator.ts for unsupported modes - Delete accidental package-lock.json (project uses bun.lock) --- src/payments/client-payments.test.ts | 10 ++--- src/payments/client-payments.ts | 41 ++++----------------- src/payments/server-explicit-gating.test.ts | 10 ++--- 3 files changed, 17 insertions(+), 44 deletions(-) diff --git a/src/payments/client-payments.test.ts b/src/payments/client-payments.test.ts index dcab0d4..d1e931c 100644 --- a/src/payments/client-payments.test.ts +++ b/src/payments/client-payments.test.ts @@ -646,7 +646,7 @@ describe('withClientPayments()', () => { expect(observed).toHaveLength(0); // Original request should be retried - expect(sentMessage).toEqual({ jsonrpc: '2.0', id: 77, method: 'tools/call', params: { name: 'test' } }); + expect(sentMessage as unknown).toEqual({ jsonrpc: '2.0', id: 77, method: 'tools/call', params: { name: 'test' } }); await paid.close(); }); @@ -695,10 +695,10 @@ describe('withClientPayments()', () => { // Error should be delivered to caller with reason expect(observed).toHaveLength(1); - const errResp = observed[0] as JSONRPCMessage; + const errResp = observed[0] as { id?: unknown; error?: { code?: number; data?: { reason?: string } } }; expect(errResp.id).toBe(88); - expect('error' in errResp && errResp.error?.code).toBe(-32042); - expect('error' in errResp && (errResp.error?.data as { reason?: string })?.reason).toBe('user_cancelled'); + expect(errResp.error?.code).toBe(-32042); + expect(errResp.error?.data?.reason).toBe('user_cancelled'); await paid.close(); }); @@ -760,7 +760,7 @@ describe('withClientPayments()', () => { expect(observed).toHaveLength(0); // Original request should be retried - expect(sentMessage).toEqual({ jsonrpc: '2.0', id: 99, method: 'tools/call', params: { name: 'test_pending' } }); + expect(sentMessage as unknown).toEqual({ jsonrpc: '2.0', id: 99, method: 'tools/call', params: { name: 'test_pending' } }); await paid.close(); }); diff --git a/src/payments/client-payments.ts b/src/payments/client-payments.ts index 3ecab51..4021fda 100644 --- a/src/payments/client-payments.ts +++ b/src/payments/client-payments.ts @@ -284,27 +284,9 @@ export function withClientPayments( const handler = handlersByPmi.get(option.pmi); if (!handler && !options.onPaymentRequired) continue; - const isNostrTransport = transport instanceof NostrClientTransport; - const pending = isNostrTransport - ? transport.getPendingRequestForEventId(requestEventId) - : undefined; - - if (isNostrTransport && !pending) { - logger.warn('dropping uncorrelated explicit payment error', { - requestEventId, - pmi: option.pmi, - }); - onmessage?.(message); - return; - } - - const originalContext = pending?.originalRequestContext - ? { - method: pending.originalRequestContext.method, - capability: pending.originalRequestContext.capability, - id: pending.originalRequestId, - } - : undefined; + // Note: For explicit gating errors (JSON-RPC error responses), the transport's + // correlation store has already consumed the pending entry via resolveResponse(). + // We rely on rawRequestCache for the retry rather than the correlation store. const request: PaymentHandlerRequest = { amount: option.amount, @@ -317,7 +299,7 @@ export function withClientPayments( }; const allow = options.paymentPolicy - ? await options.paymentPolicy(request, originalContext) + ? await options.paymentPolicy(request) : true; if (!allow) { @@ -462,18 +444,9 @@ export function withClientPayments( const data = message.error.data as import('./types.js').PaymentPendingErrorData; const retryAfterSeconds = data.retry_after; - const isNostrTransport = transport instanceof NostrClientTransport; - const pending = isNostrTransport - ? transport.getPendingRequestForEventId(requestEventId) - : undefined; - - if (!isNostrTransport || !pending) { - logger.warn('dropping uncorrelated explicit payment pending error', { - requestEventId, - }); - onmessage?.(message); - return; - } + // Note: For explicit gating errors (JSON-RPC error responses), the transport's + // correlation store has already consumed the pending entry via resolveResponse(). + // We rely on rawRequestCache for the retry rather than the correlation store. const requestId = message.id; const rawRequest = requestId != null ? rawRequestCache.get(requestId) : undefined; diff --git a/src/payments/server-explicit-gating.test.ts b/src/payments/server-explicit-gating.test.ts index e26b0e1..fdd41e9 100644 --- a/src/payments/server-explicit-gating.test.ts +++ b/src/payments/server-explicit-gating.test.ts @@ -58,7 +58,7 @@ describe('Explicit Gating Middleware', () => { pricedCapabilities: [...pricedCapabilities], }, authorizationStore: store, - sendResponse: async (pubkey, response) => { + sendResponse: async (_pubkey, response) => { sentResponses.push(response); }, }); @@ -90,7 +90,7 @@ describe('Explicit Gating Middleware', () => { pricedCapabilities: [...pricedCapabilities], }, authorizationStore: store, - sendResponse: async (pubkey, response) => { + sendResponse: async (_pubkey, response) => { sentResponses.push(response); }, }); @@ -113,7 +113,7 @@ describe('Explicit Gating Middleware', () => { pricedCapabilities: [...pricedCapabilities], }, authorizationStore: store, - sendResponse: async (pubkey, response) => { + sendResponse: async (_pubkey, response) => { sentResponses.push(response); }, }); @@ -156,7 +156,7 @@ describe('Explicit Gating Middleware', () => { resolvePrice: async () => ({ waive: true }), }, authorizationStore: store, - sendResponse: async (pubkey, response) => { + sendResponse: async (_pubkey, response) => { sentResponses.push(response); }, }); @@ -181,7 +181,7 @@ describe('Explicit Gating Middleware', () => { resolvePrice: async () => ({ reject: true, message: 'Rate limited' }), }, authorizationStore: store, - sendResponse: async (pubkey, response) => { + sendResponse: async (_pubkey, response) => { sentResponses.push(response as JSONRPCErrorResponse); }, }); From 3f605a330711f08a2f2fc10405e38a6ac375aa05 Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Sun, 14 Jun 2026 13:59:27 +0530 Subject: [PATCH 07/19] fix: session state after -32602 rejection and unreachable payment_interaction learning - Server inbound-coordinator: set effectivePaymentInteraction = 'transparent' before early return when rejecting unsupported explicit_gating. Prevents inconsistent session state (requestedPaymentInteraction set but effectivePaymentInteraction undefined). - Client inbound-coordinator: move payment_interaction tag parsing before the initialize-event early return. The server sends this tag once on its first response, which was previously unreachable because the first event triggers setInitializeEvent() + return before the tag parsing code. --- .../nostr-client/inbound-coordinator.ts | 22 +++++++++---------- .../nostr-server/inbound-coordinator.ts | 2 ++ 2 files changed, 13 insertions(+), 11 deletions(-) diff --git a/src/transport/nostr-client/inbound-coordinator.ts b/src/transport/nostr-client/inbound-coordinator.ts index 5b8da6d..09307a3 100644 --- a/src/transport/nostr-client/inbound-coordinator.ts +++ b/src/transport/nostr-client/inbound-coordinator.ts @@ -195,17 +195,6 @@ export class ClientInboundCoordinator { discovered.supportsOpenStream, ); - if (!this.deps.metadataStore.getServerInitializeEvent()) { - this.setInitializeEvent(event); - this.deps.logger.info( - 'Learned server discovery tags from inbound event', - { - eventId: event.id, - }, - ); - return; - } - const paymentInteractionTag = event.tags.find( (tag) => tag[0] === 'payment_interaction' && typeof tag[1] === 'string' ); @@ -218,6 +207,17 @@ export class ClientInboundCoordinator { } } + if (!this.deps.metadataStore.getServerInitializeEvent()) { + this.setInitializeEvent(event); + this.deps.logger.info( + 'Learned server discovery tags from inbound event', + { + eventId: event.id, + }, + ); + return; + } + const currentHasInitializeResult = InitializeResultSchema.safeParse( this.getInitializeResultCandidate(event), ).success; diff --git a/src/transport/nostr-server/inbound-coordinator.ts b/src/transport/nostr-server/inbound-coordinator.ts index 202acb0..8beaa18 100644 --- a/src/transport/nostr-server/inbound-coordinator.ts +++ b/src/transport/nostr-server/inbound-coordinator.ts @@ -184,6 +184,8 @@ export class ServerInboundCoordinator { session.requestedPaymentInteraction = mode as import('../../payments/types.js').PaymentInteractionMode; if (mode === 'explicit_gating' && !serverSupportsExplicitGating) { + session.effectivePaymentInteraction = 'transparent'; + if (isJSONRPCRequest(inboundMessage)) { const errorResponse: JSONRPCErrorResponse = { jsonrpc: '2.0', From b2471f0833f9ea67ca35e4cb63339faeafdd38fd Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Tue, 16 Jun 2026 23:54:21 +0530 Subject: [PATCH 08/19] Fix final review findings for CEP-8 explicit gating --- bun.lock | 3 - src/payments/authorization-store.test.ts | 70 ++-- src/payments/authorization-store.ts | 25 +- src/payments/canonical-identity.test.ts | 51 ++- src/payments/canonical-identity.ts | 35 +- src/payments/client-payments.test.ts | 92 +++-- src/payments/client-payments.ts | 337 +++++++++--------- src/payments/server-explicit-gating.test.ts | 47 ++- src/payments/server-explicit-gating.ts | 45 +-- src/payments/server-payments-utils.ts | 29 +- src/payments/server-payments.ts | 34 +- src/payments/server-transport-payments.ts | 18 +- src/payments/types.ts | 10 +- src/transport/capability-negotiator.ts | 15 +- src/transport/middleware.ts | 10 +- src/transport/nostr-client-transport.ts | 5 +- .../nostr-client/correlation-store.ts | 5 +- .../nostr-client/inbound-coordinator.ts | 11 +- src/transport/nostr-client/outbound-sender.ts | 5 +- .../nostr-client/server-metadata-store.ts | 7 +- src/transport/nostr-server-transport.ts | 11 +- .../nostr-server/inbound-coordinator.ts | 32 +- .../nostr-server/outbound-response-router.ts | 42 ++- src/transport/nostr-server/session-store.ts | 5 +- src/transport/payments-flow.test.ts | 11 +- 25 files changed, 572 insertions(+), 383 deletions(-) diff --git a/bun.lock b/bun.lock index 80bd268..9c76a55 100644 --- a/bun.lock +++ b/bun.lock @@ -9,7 +9,6 @@ "@noble/hashes": "^2.2.0", "applesauce-relay": "^5.2.0", "canonicalize": "^2.1.0", - "json-canonicalize": "^2.0.0", "nostr-tools": "~2.18.2", "pino": "^10.3.1", "rxjs": "^7.8.2", @@ -444,8 +443,6 @@ "json-buffer": ["json-buffer@3.0.1", "", {}, "sha512-4bV5BfR2mqfQTJm+V5tPPdf+ZpuhiIvTuAB5g8kcrXOZpTT/QwwVRWBywX1ozr6lEuPdbHxwaJlm9G6mI2sfSQ=="], - "json-canonicalize": ["json-canonicalize@2.0.0", "", {}, "sha512-yyrnK/mEm6Na3ChbJUWueXdapueW0p380RUyTW87XGb1ww8l8hU0pRrGC3vSWHe9CxrbPHX2fGUOZpNiHR0IIg=="], - "json-schema-traverse": ["json-schema-traverse@0.4.1", "", {}, "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg=="], "json-stable-stringify-without-jsonify": ["json-stable-stringify-without-jsonify@1.0.1", "", {}, "sha512-Bdboy+l7tA3OGW6FjyFHWkP5LuByj1Tk33Ljyq0axyzdk9//JSi2u3fP1QSmd1KNwq6VOKYGlAu87CisVir6Pw=="], diff --git a/src/payments/authorization-store.test.ts b/src/payments/authorization-store.test.ts index d5aa150..630dd3d 100644 --- a/src/payments/authorization-store.test.ts +++ b/src/payments/authorization-store.test.ts @@ -10,20 +10,20 @@ describe('AuthorizationStore', () => { test('grant and claim a single authorization', () => { const store = new AuthorizationStore(); - + expect(store.claim(identity)).toBe(false); - + store.grant(identity, 10000); - + expect(store.claim(identity)).toBe(true); expect(store.claim(identity)).toBe(false); }); test('grant multiple executions', () => { const store = new AuthorizationStore(); - + store.grant(identity, 10000, 2); - + expect(store.claim(identity)).toBe(true); expect(store.claim(identity)).toBe(true); expect(store.claim(identity)).toBe(false); @@ -31,72 +31,72 @@ describe('AuthorizationStore', () => { test('claim fails after TTL expires', async () => { const store = new AuthorizationStore(); - + store.grant(identity, 50); - + await new Promise((resolve) => setTimeout(resolve, 75)); - + expect(store.claim(identity)).toBe(false); }); test('trySetPending prevents concurrent duplicates', () => { const store = new AuthorizationStore(); - + // First call transitions to pending -> true expect(store.trySetPending(identity, 10000)).toBe(true); - + // Second call is blocked -> false expect(store.trySetPending(identity, 10000)).toBe(false); - + // hasPending should reflect the state expect(store.hasPending(identity)).toBe(true); }); test('trySetPending allows setting again after clearPending', () => { const store = new AuthorizationStore(); - + expect(store.trySetPending(identity, 10000)).toBe(true); expect(store.trySetPending(identity, 10000)).toBe(false); - + store.clearPending(identity); - + expect(store.trySetPending(identity, 10000)).toBe(true); }); test('trySetPending allows setting again after pending state expires', async () => { const store = new AuthorizationStore(); - + expect(store.trySetPending(identity, 50)).toBe(true); expect(store.trySetPending(identity, 50)).toBe(false); - + await new Promise((resolve) => setTimeout(resolve, 75)); - + expect(store.trySetPending(identity, 50)).toBe(true); }); test('grant clears pending state', () => { const store = new AuthorizationStore(); - + store.trySetPending(identity, 10000); expect(store.hasPending(identity)).toBe(true); - + store.grant(identity, 10000); - + expect(store.hasPending(identity)).toBe(false); expect(store.claim(identity)).toBe(true); }); - + test('LRU eviction works when maxEntries is exceeded', () => { const store = new AuthorizationStore({ maxEntries: 2 }); - + const id1 = { clientPubkey: 'client', invocationHash: 'h1' }; const id2 = { clientPubkey: 'client', invocationHash: 'h2' }; const id3 = { clientPubkey: 'client', invocationHash: 'h3' }; - + store.grant(id1, 10000); store.grant(id2, 10000); store.grant(id3, 10000); // This should evict id1 - + expect(store.claim(id1)).toBe(false); expect(store.claim(id2)).toBe(true); expect(store.claim(id3)).toBe(true); @@ -104,15 +104,15 @@ describe('AuthorizationStore', () => { test('pending LRU eviction works when maxEntries is exceeded', () => { const store = new AuthorizationStore({ maxEntries: 2 }); - + const id1 = { clientPubkey: 'client', invocationHash: 'p1' }; const id2 = { clientPubkey: 'client', invocationHash: 'p2' }; const id3 = { clientPubkey: 'client', invocationHash: 'p3' }; - + store.trySetPending(id1, 10000); store.trySetPending(id2, 10000); store.trySetPending(id3, 10000); // This should evict id1 - + expect(store.hasPending(id1)).toBe(false); expect(store.hasPending(id2)).toBe(true); expect(store.hasPending(id3)).toBe(true); @@ -120,7 +120,7 @@ describe('AuthorizationStore', () => { test('updatePendingTtl and getPendingRemainingMs behave correctly', async () => { const store = new AuthorizationStore(); - + // (1) verify getPendingRemainingMs right after trySetPending expect(store.trySetPending(identity, 100)).toBe(true); const remainingAfterSet = store.getPendingRemainingMs(identity); @@ -140,11 +140,23 @@ describe('AuthorizationStore', () => { // (4) verify updatePendingTtl is a no-op when there is no active pending entry store.updatePendingTtl(identity, 1000); expect(store.getPendingRemainingMs(identity)).toBe(0); - + // And after clearPending store.trySetPending(identity, 1000); store.clearPending(identity); store.updatePendingTtl(identity, 1000); expect(store.getPendingRemainingMs(identity)).toBe(0); }); + + test('grant throws RangeError when count is 0 or negative', () => { + const store = new AuthorizationStore(); + + expect(() => { + store.grant(identity, 1000, 0); + }).toThrow(RangeError); + + expect(() => { + store.grant(identity, 1000, -1); + }).toThrow(RangeError); + }); }); diff --git a/src/payments/authorization-store.ts b/src/payments/authorization-store.ts index f739e6e..1dfc351 100644 --- a/src/payments/authorization-store.ts +++ b/src/payments/authorization-store.ts @@ -55,7 +55,7 @@ export class AuthorizationStore { expiresAtMs, remaining: count, }); - + // Once granted, it's no longer pending this.pending.delete(key); @@ -92,7 +92,10 @@ export class AuthorizationStore { this.authorizations.delete(key); this.authorizations.set(key, auth); } - this.logger.debug('authorization claimed', { key, remaining: auth.remaining }); + this.logger.debug('authorization claimed', { + key, + remaining: auth.remaining, + }); return true; } @@ -109,10 +112,13 @@ export class AuthorizationStore { * -32042 and triggering duplicate payment flows. * NOTE: This is single-process only. Distributed setups must use an external lock. */ - public trySetPending(identity: CanonicalInvocationIdentity, ttlMs: number): boolean { + public trySetPending( + identity: CanonicalInvocationIdentity, + ttlMs: number, + ): boolean { const key = this.getKey(identity); const now = Date.now(); - + const existingExpiry = this.pending.get(key); if (existingExpiry !== undefined) { if (now > existingExpiry) { @@ -133,16 +139,16 @@ export class AuthorizationStore { public hasPending(identity: CanonicalInvocationIdentity): boolean { const key = this.getKey(identity); const expiry = this.pending.get(key); - + if (expiry === undefined) { return false; } - + if (Date.now() > expiry) { this.pending.delete(key); return false; } - + return true; } @@ -153,7 +159,10 @@ export class AuthorizationStore { * @param ttlMs The new TTL in milliseconds to apply from now. * @returns void */ - public updatePendingTtl(identity: CanonicalInvocationIdentity, ttlMs: number): void { + public updatePendingTtl( + identity: CanonicalInvocationIdentity, + ttlMs: number, + ): void { const key = this.getKey(identity); const existingExpiry = this.pending.get(key); if (existingExpiry !== undefined && Date.now() <= existingExpiry) { diff --git a/src/payments/canonical-identity.test.ts b/src/payments/canonical-identity.test.ts index b2fb7b2..dd60028 100644 --- a/src/payments/canonical-identity.test.ts +++ b/src/payments/canonical-identity.test.ts @@ -12,7 +12,7 @@ describe('Canonical Invocation Identity', () => { b: 2, name: 'test', }); - + const hash2 = computeCanonicalInvocationHash('tools/call', { name: 'test', b: 2, @@ -27,7 +27,7 @@ describe('Canonical Invocation Identity', () => { test('handles empty params', () => { const hash1 = computeCanonicalInvocationHash('tools/call', undefined); const hash2 = computeCanonicalInvocationHash('tools/call', null); - + expect(hash1).not.toBe(hash2); expect(hash1).toMatch(/^[0-9a-f]{64}$/); }); @@ -37,7 +37,7 @@ describe('Canonical Invocation Identity', () => { nested: { z: 1, y: 2, x: 3 }, arr: [1, 2, 3], }); - + const hash2 = computeCanonicalInvocationHash('tools/call', { arr: [1, 2, 3], nested: { x: 3, z: 1, y: 2 }, @@ -50,7 +50,7 @@ describe('Canonical Invocation Identity', () => { const hash1 = computeCanonicalInvocationHash('tools/call', { text: 'Hello 🌍', }); - + const hash2 = computeCanonicalInvocationHash('tools/call', { text: 'Hello 🌍', }); @@ -64,13 +64,44 @@ describe('Canonical Invocation Identity', () => { expect(hash1).not.toBe(hash2); }); - + test('differs for different param values', () => { const hash1 = computeCanonicalInvocationHash('tools/call', { a: 1 }); const hash2 = computeCanonicalInvocationHash('tools/call', { a: 2 }); expect(hash1).not.toBe(hash2); }); + + test('throws error for circular references', () => { + const obj: any = {}; + obj.self = obj; + expect(() => computeCanonicalInvocationHash('tools/call', obj)).toThrow( + "Failed to canonicalize invocation payload for method 'tools/call'. Ensure params contain only JSON-serializable values (no circular references, functions, symbols, or BigInt).", + ); + }); + + test('throws error for non-serializable values', () => { + expect(() => + computeCanonicalInvocationHash('tools/call', { fn: () => {} }), + ).toThrow( + "Failed to canonicalize invocation payload for method 'tools/call'. Ensure params contain only JSON-serializable values (no circular references, functions, symbols, or BigInt).", + ); + expect(() => + computeCanonicalInvocationHash('tools/call', { sym: Symbol('test') }), + ).toThrow( + "Failed to canonicalize invocation payload for method 'tools/call'. Ensure params contain only JSON-serializable values (no circular references, functions, symbols, or BigInt).", + ); + expect(() => + computeCanonicalInvocationHash('tools/call', { big: BigInt('9007199254740991') }), + ).toThrow( + "Failed to canonicalize invocation payload for method 'tools/call'. Ensure params contain only JSON-serializable values (no circular references, functions, symbols, or BigInt).", + ); + }); + + test('handles empty string method', () => { + const hash1 = computeCanonicalInvocationHash('', { a: 1 }); + expect(hash1).toMatch(/^[0-9a-f]{64}$/); + }); }); describe('computeCanonicalInvocationIdentity', () => { @@ -79,10 +110,16 @@ describe('Canonical Invocation Identity', () => { const method = 'tools/call'; const params = { name: 'test' }; - const identity = computeCanonicalInvocationIdentity(pubkey, method, params); + const identity = computeCanonicalInvocationIdentity( + pubkey, + method, + params, + ); expect(identity.clientPubkey).toBe(pubkey); - expect(identity.invocationHash).toBe(computeCanonicalInvocationHash(method, params)); + expect(identity.invocationHash).toBe( + computeCanonicalInvocationHash(method, params), + ); }); }); }); diff --git a/src/payments/canonical-identity.ts b/src/payments/canonical-identity.ts index 40fb7cd..aeaa36e 100644 --- a/src/payments/canonical-identity.ts +++ b/src/payments/canonical-identity.ts @@ -1,7 +1,8 @@ import canonicalizePackage from 'canonicalize'; type CanonicalizeFn = (input: unknown) => string | undefined; const canonicalize = canonicalizePackage as unknown as CanonicalizeFn; -import { createHash } from 'crypto'; +import { sha256 } from '@noble/hashes/sha2.js'; +import { bytesToHex } from '@noble/hashes/utils.js'; import type { CanonicalInvocationIdentity } from './types.js'; /** @@ -18,14 +19,34 @@ export function computeCanonicalInvocationHash( params: unknown, ): string { const payload = { method, params }; - const canonicalString = canonicalize(payload); + let canonicalString: string | undefined; + try { + // Pre-validate that all values are strictly JSON-serializable. + // canonicalize() might ignore functions/symbols or throw stack overflows, + // so we use JSON.stringify as a strict validator first. + JSON.stringify(payload, (_key, value) => { + if ( + typeof value === 'function' || + typeof value === 'symbol' || + typeof value === 'bigint' + ) { + throw new Error('Invalid type'); + } + return value; + }); + canonicalString = canonicalize(payload); + } catch { + canonicalString = undefined; + } + if (canonicalString === undefined) { - throw new Error('Failed to canonicalize invocation payload'); + throw new Error( + `Failed to canonicalize invocation payload for method '${method}'. ` + + 'Ensure params contain only JSON-serializable values (no circular references, functions, symbols, or BigInt).', + ); } - - return createHash('sha256') - .update(canonicalString) - .digest('hex'); + + return bytesToHex(sha256(new TextEncoder().encode(canonicalString))); } /** diff --git a/src/payments/client-payments.test.ts b/src/payments/client-payments.test.ts index d1e931c..692b83d 100644 --- a/src/payments/client-payments.test.ts +++ b/src/payments/client-payments.test.ts @@ -606,8 +606,13 @@ describe('withClientPayments()', () => { .correlationStore.registerRequest('req-event-id-3', { originalRequestId: 77, isInitialize: false, - rawRequest: { jsonrpc: '2.0', id: 77, method: 'tools/call', params: { name: 'test' } }, - originalRequestContext: { method: 'tools/call' } + rawRequest: { + jsonrpc: '2.0', + id: 77, + method: 'tools/call', + params: { name: 'test' }, + }, + originalRequestContext: { method: 'tools/call' }, }); const observed: JSONRPCMessage[] = []; @@ -620,7 +625,12 @@ describe('withClientPayments()', () => { await paid.start(); // Populate the wrapper's cache with the original request - await paid.send({ jsonrpc: '2.0', id: 77, method: 'tools/call', params: { name: 'test' } }); + await paid.send({ + jsonrpc: '2.0', + id: 77, + method: 'tools/call', + params: { name: 'test' }, + }); sentMessage = undefined; // Reset mock state so we can observe the retry // Deliver -32042 Payment Required error @@ -632,9 +642,9 @@ describe('withClientPayments()', () => { code: -32042, message: 'Payment Required', data: { - payment_options: [{ amount: 10, pmi: 'fake', pay_req: 'pr1' }] - } - } + payment_options: [{ amount: 10, pmi: 'fake', pay_req: 'pr1' }], + }, + }, }, { eventId: 'evt4', correlatedEventId: 'req-event-id-3' }, ); @@ -646,34 +656,52 @@ describe('withClientPayments()', () => { expect(observed).toHaveLength(0); // Original request should be retried - expect(sentMessage as unknown).toEqual({ jsonrpc: '2.0', id: 77, method: 'tools/call', params: { name: 'test' } }); + expect(sentMessage as unknown).toEqual({ + jsonrpc: '2.0', + id: 77, + method: 'tools/call', + params: { name: 'test' }, + }); await paid.close(); }); test('propagates -32042 error if onPaymentRequired returns paid: false', async () => { const transport = createMockNostrTransport(); - + transport .getInternalStateForTesting() .correlationStore.registerRequest('req-event-id-4', { originalRequestId: 88, isInitialize: false, - rawRequest: { jsonrpc: '2.0', id: 88, method: 'tools/call', params: { name: 'test' } }, - originalRequestContext: { method: 'tools/call' } + rawRequest: { + jsonrpc: '2.0', + id: 88, + method: 'tools/call', + params: { name: 'test' }, + }, + originalRequestContext: { method: 'tools/call' }, }); const observed: JSONRPCMessage[] = []; const paid = withClientPayments(transport, { handlers: [{ pmi: 'fake', async handle(): Promise {} }], paymentInteraction: 'explicit_gating', - onPaymentRequired: async () => ({ paid: false, reason: 'user_cancelled' }), + onPaymentRequired: async () => ({ + paid: false, + reason: 'user_cancelled', + }), }); paid.onmessage = (msg) => observed.push(msg); await paid.start(); // Populate the wrapper's cache with the original request - await paid.send({ jsonrpc: '2.0', id: 88, method: 'tools/call', params: { name: 'test' } }); + await paid.send({ + jsonrpc: '2.0', + id: 88, + method: 'tools/call', + params: { name: 'test' }, + }); // Deliver -32042 Payment Required error transport.onmessageWithContext!( @@ -684,9 +712,9 @@ describe('withClientPayments()', () => { code: -32042, message: 'Payment Required', data: { - payment_options: [{ amount: 10, pmi: 'fake', pay_req: 'pr2' }] - } - } + payment_options: [{ amount: 10, pmi: 'fake', pay_req: 'pr2' }], + }, + }, }, { eventId: 'evt5', correlatedEventId: 'req-event-id-4' }, ); @@ -695,7 +723,10 @@ describe('withClientPayments()', () => { // Error should be delivered to caller with reason expect(observed).toHaveLength(1); - const errResp = observed[0] as { id?: unknown; error?: { code?: number; data?: { reason?: string } } }; + const errResp = observed[0] as { + id?: unknown; + error?: { code?: number; data?: { reason?: string } }; + }; expect(errResp.id).toBe(88); expect(errResp.error?.code).toBe(-32042); expect(errResp.error?.data?.reason).toBe('user_cancelled'); @@ -715,8 +746,13 @@ describe('withClientPayments()', () => { .correlationStore.registerRequest('req-event-id-5', { originalRequestId: 99, isInitialize: false, - rawRequest: { jsonrpc: '2.0', id: 99, method: 'tools/call', params: { name: 'test_pending' } }, - originalRequestContext: { method: 'tools/call' } + rawRequest: { + jsonrpc: '2.0', + id: 99, + method: 'tools/call', + params: { name: 'test_pending' }, + }, + originalRequestContext: { method: 'tools/call' }, }); const observed: JSONRPCMessage[] = []; @@ -728,7 +764,12 @@ describe('withClientPayments()', () => { await paid.start(); // Populate the wrapper's cache with the original request - await paid.send({ jsonrpc: '2.0', id: 99, method: 'tools/call', params: { name: 'test_pending' } }); + await paid.send({ + jsonrpc: '2.0', + id: 99, + method: 'tools/call', + params: { name: 'test_pending' }, + }); sentMessage = undefined; // Reset mock state so we can observe the retry // Deliver -32043 Payment Pending error @@ -741,9 +782,9 @@ describe('withClientPayments()', () => { message: 'Payment Pending', data: { instructions: 'Wait and retry.', - retry_after: 0.05 // 50ms for test - } - } + retry_after: 0.05, // 50ms for test + }, + }, }, { eventId: 'evt6', correlatedEventId: 'req-event-id-5' }, ); @@ -760,7 +801,12 @@ describe('withClientPayments()', () => { expect(observed).toHaveLength(0); // Original request should be retried - expect(sentMessage as unknown).toEqual({ jsonrpc: '2.0', id: 99, method: 'tools/call', params: { name: 'test_pending' } }); + expect(sentMessage as unknown).toEqual({ + jsonrpc: '2.0', + id: 99, + method: 'tools/call', + params: { name: 'test_pending' }, + }); await paid.close(); }); diff --git a/src/payments/client-payments.ts b/src/payments/client-payments.ts index 4021fda..826e399 100644 --- a/src/payments/client-payments.ts +++ b/src/payments/client-payments.ts @@ -3,9 +3,10 @@ import { isJSONRPCNotification, isJSONRPCResultResponse, isJSONRPCErrorResponse, - JSONRPCNotification, + type JSONRPCNotification, type JSONRPCMessage, type JSONRPCRequest, + type JSONRPCErrorResponse, } from '@contextvm/mcp-sdk/types.js'; import { NostrClientTransport } from '../transport/nostr-client-transport.js'; import { @@ -14,8 +15,16 @@ import { PaymentRequiredNotification, PaymentHandlerRequest, } from './types.js'; +import { LruCache } from '../core/utils/lru-cache.js'; import { createLogger } from '../core/utils/logger.js'; import type { OriginalRequestContext } from '../transport/nostr-client/correlation-store.js'; +import type { + PaymentInteractionMode, + PaymentOption, + PaymentRequiredErrorData, + PaymentPendingErrorData, +} from './types.js'; + import { DEFAULT_SYNTHETIC_PROGRESS_INTERVAL_MS, DEFAULT_PAYMENT_TTL_MS, @@ -61,7 +70,7 @@ export interface ClientPaymentsOptions { ) => boolean | Promise; /** Requested payment interaction mode. @default 'transparent' */ - paymentInteraction?: import('./types.js').PaymentInteractionMode; + paymentInteraction?: PaymentInteractionMode; /** * Handler for explicit-gating -32042 errors. @@ -81,9 +90,9 @@ export interface ClientPaymentsOptions { * `message` contains the provider error details. */ onPaymentRequired?: (params: { - options: import('./types.js').PaymentOption[]; + options: PaymentOption[]; instructions?: string; - originalRequest: import('@modelcontextprotocol/sdk/types.js').JSONRPCRequest; + originalRequest: JSONRPCRequest; }) => Promise<{ paid: boolean; reason?: string }>; } @@ -113,26 +122,30 @@ function supportsOnmessageWithContext( function isExplicitPaymentRequiredError( msg: JSONRPCMessage, -): msg is import('@modelcontextprotocol/sdk/types.js').JSONRPCErrorResponse { +): msg is JSONRPCErrorResponse { return ( isJSONRPCErrorResponse(msg) && msg.error.code === PAYMENT_REQUIRED_ERROR_CODE && typeof msg.error.data === 'object' && msg.error.data !== null && - Array.isArray((msg.error.data as { payment_options?: unknown }).payment_options) && - ((msg.error.data as { payment_options: unknown[] }).payment_options).length > 0 + Array.isArray( + (msg.error.data as { payment_options?: unknown }).payment_options, + ) && + (msg.error.data as { payment_options: unknown[] }).payment_options.length > + 0 ); } function isExplicitPaymentPendingError( msg: JSONRPCMessage, -): msg is import('@modelcontextprotocol/sdk/types.js').JSONRPCErrorResponse { +): msg is JSONRPCErrorResponse { return ( isJSONRPCErrorResponse(msg) && msg.error.code === PAYMENT_PENDING_ERROR_CODE && typeof msg.error.data === 'object' && msg.error.data !== null && - typeof (msg.error.data as { retry_after?: unknown }).retry_after === 'number' + typeof (msg.error.data as { retry_after?: unknown }).retry_after === + 'number' ); } @@ -218,7 +231,7 @@ export function withClientPayments( const pendingTimers = new Set>(); const retryCounts = new Map(); - const rawRequestCache = new Map(); + const rawRequestCache = new LruCache(1000); const MAX_RETRIES = 5; const stopAllSyntheticProgress = (): void => { @@ -277,158 +290,9 @@ export function withClientPayments( requestEventId: string, ): Promise { if (isExplicitPaymentRequiredError(message)) { - // Explicit gating lifecycle (-32042 Payment Required) - const data = message.error.data as import('./types.js').PaymentRequiredErrorData; - - for (const option of data.payment_options) { - const handler = handlersByPmi.get(option.pmi); - if (!handler && !options.onPaymentRequired) continue; - - // Note: For explicit gating errors (JSON-RPC error responses), the transport's - // correlation store has already consumed the pending entry via resolveResponse(). - // We rely on rawRequestCache for the retry rather than the correlation store. - - const request: PaymentHandlerRequest = { - amount: option.amount, - pay_req: option.pay_req, - pmi: option.pmi, - description: option.description, - ttl: option.ttl, - _meta: option._meta, - requestEventId, - }; - - const allow = options.paymentPolicy - ? await options.paymentPolicy(request) - : true; - - if (!allow) { - logger.debug('payment_required rejected by policy', { - requestEventId, - pmi: option.pmi, - }); - continue; // Try next option if rejected by policy - } - - const canHandle = handler?.canHandle - ? await handler.canHandle(request) - : true; - - if (!canHandle) { - logger.debug('payment_required cannot be handled by handler', { - requestEventId, - pmi: option.pmi, - }); - continue; // Try next option if handler can't handle - } - - logger.info('executing payment handler for explicit gating', { - requestEventId, - pmi: option.pmi, - amount: option.amount, - }); - - try { - // In explicit gating, we do NOT call handler.handle(request) directly. - // Instead, we delegate entirely to options.onPaymentRequired. - - // In explicit gating, the client MUST retry the exact same request - // to trigger authorization consumption and get the result. - // Since we intercepted the error, we need the original request. - // For NostrClientTransport, we don't have the original raw request cached perfectly, - // but we can reconstruct it or we should just let the error propagate - // and let the caller handle retry. - - if (!options.onPaymentRequired) { - // We have a payment required error but the transport level onPaymentRequired handler - // wasn't configured. The client didn't supply an explicit gating handler. - // We'll let the error propagate. - onmessage?.(message); - return; - } - - const requestId = message.id; - const rawRequest = requestId != null ? rawRequestCache.get(requestId) : undefined; - if (!rawRequest) { - logger.warn('missing raw original request, cannot retry explicit payment', { requestEventId }); - onmessage?.(message); - return; - } + const errorMsg = message as JSONRPCErrorResponse; + const data = errorMsg.error.data as PaymentRequiredErrorData; - const result = await options.onPaymentRequired({ - options: data.payment_options, - instructions: data.instructions, - originalRequest: rawRequest, - }); - - if (result.paid) { - // Only if they successfully paid via onPaymentRequired do we proceed to retry - logger.info('explicit payment satisfied, retrying original request', { - requestEventId, - method: rawRequest.method, - }); - - // Re-send the exact request, updating the ID if necessary (or letting MCP SDK handle it) - // But actually we are the transport, we can just resend the raw request through the transport. - // Wait, we need to create a new ID so the proxy can track it properly. - // Oh right, we can't easily resend and magically stitch it back to the original Promise in the MCP Client. - // Actually, if we just send() it, the original promise in the MCP Client is already waiting - // for the response with the *original* ID. - // Wait, no, the server sent us an error response with the *original* ID. - // The MCP Client will resolve that promise with an Error. - // So we MUST NOT deliver the error response to `onmessage` if we want to intercept and retry. - // We intercepted the error! We haven't called `onmessage` yet. - // So if we just resend the raw request to the server, with a new requestEventId, - // we will need to map the NEW response back to the OLD request ID. - - // This requires transport level support. - // The plan says: "When onPaymentRequired returns { paid: true }, the wrapper re-sends the original JSONRPCRequest with the same method and params (new id is fine per spec). This is transparent to the upstream MCP Client." - // Wait, if it has a new id, how does the upstream MCP Client know it's the response? - // Actually, we must use the original ID when communicating with the upstream client. - // But when we send it to the server, we just pass the original request exactly as it was. - // We don't change the ID. The `NostrClientTransport` wraps the `id` inside a new `requestId`. - - await transport.send(rawRequest); - return; // WE SUCCESSFULLY RETRIED! Do not deliver the error to `onmessage`. - } else { - // User cancelled or returned paid=false - logger.debug('onPaymentRequired returned paid=false', { requestEventId, reason: result.reason }); - const errorMsg: import('@modelcontextprotocol/sdk/types.js').JSONRPCMessage = { - jsonrpc: '2.0', - id: message.id, - error: { - code: PAYMENT_REQUIRED_ERROR_CODE, - message: 'Payment Required', - data: { reason: result.reason || 'user_cancelled' } - } - }; - onmessage?.(errorMsg); - return; - } - } catch (err) { - logger.error('payment handler failed', { - requestEventId, - pmi: option.pmi, - error: err instanceof Error ? err.message : String(err), - }); - // Spec: onPaymentRequired rejection MUST cause the original JSON-RPC request to fail. - const errorMsg: import('@modelcontextprotocol/sdk/types.js').JSONRPCMessage = { - jsonrpc: '2.0', - id: message.id, - error: { - code: PAYMENT_REQUIRED_ERROR_CODE, - message: 'Payment Required', - data: { reason: err instanceof Error ? err.message : String(err), type: 'payment_handler_error' } - } - }; - onmessage?.(errorMsg); - return; - } - - // We handled (or attempted) the payment. Stop evaluating other options. - // If we failed, we break and the -32042 will be emitted to `onmessage`. - // Actually we already returned if we handled it. - } // If we got here, we either: // 1. Paid successfully but we need to signal the caller to retry (if we don't retry ourselves) @@ -452,34 +316,148 @@ export function withClientPayments( const rawRequest = requestId != null ? rawRequestCache.get(requestId) : undefined; if (!rawRequest) { logger.warn('missing raw original request, cannot retry explicit payment pending', { requestEventId }); +======= + if (!options.onPaymentRequired) { +>>>>>>> e0d4c5b (Fix final review findings for CEP-8 explicit gating) onmessage?.(message); return; } - - const requestIdKey = message.id as string | number; + + const requestId = errorMsg.id; + const rawRequest = + requestId != null ? rawRequestCache.get(String(requestId)) : undefined; + if (!rawRequest) { + logger.warn( + 'missing raw original request, cannot retry explicit payment', + { requestEventId }, + ); + onmessage?.(message); + return; + } + + logger.info('invoking onPaymentRequired for explicit gating', { + requestEventId, + optionsCount: data.payment_options.length, + }); + + try { + const result = await options.onPaymentRequired({ + options: data.payment_options, + instructions: data.instructions, + originalRequest: rawRequest, + }); + + if (result.paid) { + logger.info('explicit payment satisfied, retrying original request', { + requestEventId, + method: rawRequest.method, + }); + await transport.send(rawRequest); + return; + } else { + logger.debug('onPaymentRequired returned paid=false', { + requestEventId, + reason: result.reason, + }); + const newErrorMsg: JSONRPCMessage = { + jsonrpc: '2.0', + id: errorMsg.id, + error: { + code: PAYMENT_REQUIRED_ERROR_CODE, + message: 'Payment Required', + data: { reason: result.reason || 'user_cancelled' }, + }, + }; + onmessage?.(newErrorMsg); + return; + } + } catch (err) { + logger.error('onPaymentRequired callback failed', { + requestEventId, + error: err instanceof Error ? err.message : String(err), + }); + const newErrorMsg: JSONRPCMessage = { + jsonrpc: '2.0', + id: errorMsg.id, + error: { + code: PAYMENT_REQUIRED_ERROR_CODE, + message: 'Payment Required', + data: { + reason: err instanceof Error ? err.message : String(err), + type: 'payment_handler_error', + }, + }, + }; + onmessage?.(newErrorMsg); + return; + } + } + + if (isExplicitPaymentPendingError(message)) { + const errorMsg = message as JSONRPCErrorResponse; + const data = errorMsg.error.data as PaymentPendingErrorData; + const retryAfterSeconds = data.retry_after; + + const requestId = errorMsg.id; + const rawRequest = + requestId != null ? rawRequestCache.get(String(requestId)) : undefined; + if (!rawRequest) { + logger.warn( + 'missing raw original request, cannot retry explicit payment pending', + { requestEventId }, + ); + onmessage?.(message); + return; + } + + const requestIdKey = errorMsg.id as string | number; const retries = retryCounts.get(requestIdKey) ?? 0; if (retries >= MAX_RETRIES) { - logger.error('max explicit payment retries exceeded', { requestEventId, id: requestIdKey, maxRetries: MAX_RETRIES }); + logger.error('max explicit payment retries exceeded', { + requestEventId, + id: requestIdKey, + maxRetries: MAX_RETRIES, + }); onmessage?.(message); return; } retryCounts.set(requestIdKey, retries + 1); - + logger.info('payment pending, retrying after backoff', { requestEventId, retryAfterSeconds, retryCount: retries + 1, }); - + + const baseDelayMs = (retryAfterSeconds ?? 1) * 1000; + const exponentialMultiplier = Math.pow(1.5, retries); + const delayMs = Math.min(baseDelayMs * exponentialMultiplier, 10000); + const timer = setTimeout(() => { pendingTimers.delete(timer); - transport.send(rawRequest).catch(err => { - logger.error('failed to retry pending request', { requestEventId, error: err instanceof Error ? err.message : String(err) }); + transport.send(rawRequest).catch((err) => { + logger.error('failed to retry pending request', { + requestEventId, + error: err instanceof Error ? err.message : String(err), + }); + const errorMsg: JSONRPCErrorResponse = + { + jsonrpc: '2.0', + id: rawRequest.id, + error: { + code: PAYMENT_PENDING_ERROR_CODE, + message: 'Failed to retry pending request', + data: { + reason: err instanceof Error ? err.message : String(err), + }, + }, + }; + onmessage?.(errorMsg); }); - }, (retryAfterSeconds ?? 1) * 1000); + }, delayMs); pendingTimers.add(timer); - + return; // Intercept the error so the client waits } @@ -708,9 +686,12 @@ export function withClientPayments( isJSONRPCErrorResponse(message) ) { stopSyntheticProgress(String(message.id)); - if (!isExplicitPaymentRequiredError(message) && !isExplicitPaymentPendingError(message)) { + if ( + !isExplicitPaymentRequiredError(message) && + !isExplicitPaymentPendingError(message) + ) { const reqId = message.id as string | number; - rawRequestCache.delete(reqId); + rawRequestCache.delete(String(reqId)); retryCounts.delete(reqId); } } @@ -729,7 +710,10 @@ export function withClientPayments( // If it's an explicit gating error, we intercept it here because // maybeHandlePaymentRequired takes responsibility for re-emitting it if unhandled. - if (isExplicitPaymentRequiredError(message) || isExplicitPaymentPendingError(message)) { + if ( + isExplicitPaymentRequiredError(message) || + isExplicitPaymentPendingError(message) + ) { return; } @@ -786,7 +770,10 @@ export function withClientPayments( // If it's an explicit gating error, we intercept it here because // maybeHandlePaymentRequired takes responsibility for re-emitting it if unhandled. - if (isExplicitPaymentRequiredError(message) || isExplicitPaymentPendingError(message)) { + if ( + isExplicitPaymentRequiredError(message) || + isExplicitPaymentPendingError(message) + ) { return; } @@ -805,7 +792,7 @@ export function withClientPayments( async send(message: JSONRPCMessage): Promise { if ('method' in message && 'id' in message && message.id != null) { - rawRequestCache.set(message.id, message as JSONRPCRequest); + rawRequestCache.set(String(message.id), message as JSONRPCRequest); } await transport.send(message); }, diff --git a/src/payments/server-explicit-gating.test.ts b/src/payments/server-explicit-gating.test.ts index fdd41e9..e3e94b2 100644 --- a/src/payments/server-explicit-gating.test.ts +++ b/src/payments/server-explicit-gating.test.ts @@ -1,8 +1,15 @@ import { describe, expect, test } from 'bun:test'; -import type { JSONRPCErrorResponse, JSONRPCRequest } from '@modelcontextprotocol/sdk/types.js'; +import type { + JSONRPCErrorResponse, + JSONRPCRequest, +} from '@contextvm/mcp-sdk/types.js'; import { createExplicitGatingMiddleware } from './server-explicit-gating.js'; +import type { ServerPaymentsContext } from './types.js'; import { AuthorizationStore } from './authorization-store.js'; -import { PAYMENT_PENDING_ERROR_CODE, PAYMENT_REQUIRED_ERROR_CODE } from './constants.js'; +import { + PAYMENT_PENDING_ERROR_CODE, + PAYMENT_REQUIRED_ERROR_CODE, +} from './constants.js'; describe('Explicit Gating Middleware', () => { const processor = { @@ -37,8 +44,9 @@ describe('Explicit Gating Middleware', () => { }, ] as const; - const ctx: { clientPubkey: string; clientPmis?: readonly string[] } = { + const ctx: ServerPaymentsContext = { clientPubkey: 'test-client', + paymentInteraction: 'explicit_gating', }; const message: JSONRPCRequest = { @@ -51,7 +59,7 @@ describe('Explicit Gating Middleware', () => { test('emits -32042 Payment Required on first request', async () => { const store = new AuthorizationStore(); const sentResponses: JSONRPCErrorResponse[] = []; - + const mw = createExplicitGatingMiddleware({ options: { processors: [processor], @@ -70,11 +78,13 @@ describe('Explicit Gating Middleware', () => { expect(forwarded).toBe(false); expect(sentResponses.length).toBe(1); - + const response = sentResponses[0]; expect(response.error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); - - const data = response.error.data as { payment_options: { amount: number; pay_req: string }[] }; + + const data = response.error.data as { + payment_options: { amount: number; pay_req: string }[]; + }; expect(data.payment_options.length).toBe(1); expect(data.payment_options[0].amount).toBe(10); expect(data.payment_options[0].pay_req).toBe('pay_req'); @@ -83,7 +93,7 @@ describe('Explicit Gating Middleware', () => { test('emits -32043 Payment Pending if already pending', async () => { const store = new AuthorizationStore(); const sentResponses: JSONRPCErrorResponse[] = []; - + const mw = createExplicitGatingMiddleware({ options: { processors: [processor], @@ -106,7 +116,7 @@ describe('Explicit Gating Middleware', () => { test('forwards request if authorization is granted', async () => { const store = new AuthorizationStore(); const sentResponses: JSONRPCErrorResponse[] = []; - + const mw = createExplicitGatingMiddleware({ options: { processors: [processor], @@ -122,8 +132,13 @@ describe('Explicit Gating Middleware', () => { // The canonical identity depends on the method and params // JCS of { method: "tools/call", params: { name: "add", arguments: { a: 1, b: 2 } } } // We can just use the utility to compute it - const { computeCanonicalInvocationIdentity } = await import('./canonical-identity.js'); - const identity = computeCanonicalInvocationIdentity(ctx.clientPubkey, message.method, message.params); + const { computeCanonicalInvocationIdentity } = + await import('./canonical-identity.js'); + const identity = computeCanonicalInvocationIdentity( + ctx.clientPubkey, + message.method, + message.params, + ); store.grant(identity, 10000); let forwarded = false; @@ -133,22 +148,22 @@ describe('Explicit Gating Middleware', () => { expect(sentResponses.length).toBe(0); expect(forwarded).toBe(true); - + // Auth should be consumed, second call should trigger payment required let forwarded2 = false; await mw(message, ctx, async () => { forwarded2 = true; }); - + expect(forwarded2).toBe(false); expect(sentResponses.length).toBe(1); expect(sentResponses[0].error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); }); - + test('forwards request directly if resolvePrice waives payment', async () => { const store = new AuthorizationStore(); const sentResponses: JSONRPCErrorResponse[] = []; - + const mw = createExplicitGatingMiddleware({ options: { processors: [processor], @@ -173,7 +188,7 @@ describe('Explicit Gating Middleware', () => { test('rejects request immediately if resolvePrice rejects', async () => { const store = new AuthorizationStore(); const sentResponses: JSONRPCErrorResponse[] = []; - + const mw = createExplicitGatingMiddleware({ options: { processors: [processor], diff --git a/src/payments/server-explicit-gating.ts b/src/payments/server-explicit-gating.ts index abfe896..be9495a 100644 --- a/src/payments/server-explicit-gating.ts +++ b/src/payments/server-explicit-gating.ts @@ -9,6 +9,7 @@ import { matchPricedCapability, isResolvePriceRejection, isResolvePriceWaiver, + resolvePaymentProcessor, } from './server-payments-utils.js'; import { createLogger } from '../core/utils/logger.js'; import { withTimeout } from '../core/utils/utils.js'; @@ -44,6 +45,11 @@ export function createExplicitGatingMiddleware( return; } + if (ctx.paymentInteraction !== 'explicit_gating') { + await forward(message); + return; + } + const priced = matchPricedCapability(message, options.pricedCapabilities); if (!priced) { await forward(message); @@ -82,9 +88,16 @@ export function createExplicitGatingMiddleware( code: PAYMENT_PENDING_ERROR_CODE, message: 'Payment Pending', data: { - instructions: 'A payment is already pending for this invocation. Wait and retry.', + instructions: + 'A payment is already pending for this invocation. Wait and retry.', // Suggest a short polling interval (e.g. 2 seconds) rather than the full TTL - retry_after: Math.min(2, Math.ceil(authorizationStore.getPendingRemainingMs(identity) / 1000)) || 2, + retry_after: + Math.min( + 2, + Math.ceil( + authorizationStore.getPendingRemainingMs(identity) / 1000, + ), + ) || 2, }, }, }; @@ -94,20 +107,11 @@ export function createExplicitGatingMiddleware( // 3. Resolve price and initiate new payment try { - const clientPmis = ctx.clientPmis; - const chosenPmi = clientPmis - ? clientPmis.find((pmi) => processorsByPmi.has(pmi)) - : undefined; - - const chosenProcessor = chosenPmi - ? processorsByPmi.get(chosenPmi) - : options.processors[0]; - - if (!chosenProcessor) { - throw new Error('No payment processors configured'); - } - - const processor = chosenProcessor; + const processor = resolvePaymentProcessor( + ctx.clientPmis, + processorsByPmi, + options.processors, + ); const quote = options.resolvePrice ? await options.resolvePrice({ @@ -127,7 +131,7 @@ export function createExplicitGatingMiddleware( }); authorizationStore.clearPending(identity); - + // Spec: When a capability is rejected by policy, return a standard error. // We'll use -32000 (Internal error or application-defined error) since CEP-8 doesn't specify a special rejection code. const errorResponse: JSONRPCErrorResponse = { @@ -162,8 +166,7 @@ export function createExplicitGatingMiddleware( }); const mergedMeta = - resolvedQuote.meta === undefined && - paymentRequired._meta === undefined + resolvedQuote.meta === undefined && paymentRequired._meta === undefined ? undefined : { ...(paymentRequired._meta ?? {}), @@ -175,7 +178,7 @@ export function createExplicitGatingMiddleware( ttlSeconds: paymentRequired.ttl, }); const effectiveTimeoutMs = Math.min(verifyTimeoutMs, paymentTtlMs); - + // Update pending with the precise TTL authorizationStore.updatePendingTtl(identity, effectiveTimeoutMs); @@ -186,6 +189,8 @@ export function createExplicitGatingMiddleware( code: PAYMENT_REQUIRED_ERROR_CODE, message: 'Payment Required', data: { + instructions: + 'Payment is required to process this request. Please pay one of the following options and retry the request.', payment_options: [ { amount: paymentRequired.amount, diff --git a/src/payments/server-payments-utils.ts b/src/payments/server-payments-utils.ts index 2928ea4..94ccc06 100644 --- a/src/payments/server-payments-utils.ts +++ b/src/payments/server-payments-utils.ts @@ -4,6 +4,7 @@ import type { ResolvePriceRejection, ResolvePriceWaiver, ResolvePriceResult, + PaymentProcessor, } from './types.js'; export function getVerificationTimeoutMs(params: { @@ -17,7 +18,8 @@ export function getVerificationTimeoutMs(params: { if (!Number.isFinite(ttlSeconds) || ttlSeconds <= 0) { return 5 * 60 * 1000; } - return Math.floor(ttlSeconds * 1000); + const ms = ttlSeconds * 1000; + return Number.isFinite(ms) ? Math.floor(ms) : 5 * 60 * 1000; } export function matchPricedCapability( @@ -39,10 +41,7 @@ export function getCapabilityNameForPricing( const params = message.params as Record | undefined; switch (message.method) { - case 'tools/call': { - const name = params?.name; - return typeof name === 'string' ? name : undefined; - } + case 'tools/call': case 'prompts/get': { const name = params?.name; return typeof name === 'string' ? name : undefined; @@ -67,3 +66,23 @@ export function isResolvePriceWaiver( ): quote is ResolvePriceWaiver { return 'waive' in quote && quote.waive; } + +export function resolvePaymentProcessor( + clientPmis: readonly string[] | undefined, + processorsByPmi: Map, + processors: readonly PaymentProcessor[], +): PaymentProcessor { + const chosenPmi = clientPmis + ? clientPmis.find((pmi) => processorsByPmi.has(pmi)) + : undefined; + + const chosenProcessor = chosenPmi + ? processorsByPmi.get(chosenPmi) + : processors[0]; + + if (!chosenProcessor) { + throw new Error('No payment processors configured'); + } + + return chosenProcessor; +} diff --git a/src/payments/server-payments.ts b/src/payments/server-payments.ts index 53a8cc8..f35908c 100644 --- a/src/payments/server-payments.ts +++ b/src/payments/server-payments.ts @@ -25,9 +25,9 @@ import { matchPricedCapability, isResolvePriceRejection, isResolvePriceWaiver, + resolvePaymentProcessor, } from './server-payments-utils.js'; - export interface ServerPaymentsOptions { processors: readonly PaymentProcessor[]; pricedCapabilities: readonly PricedCapability[]; @@ -79,8 +79,6 @@ type PendingPaymentState = { inFlight: Promise; }; - - function createPaymentRequiredNotification(params: { amount: number; pay_req: string; @@ -120,8 +118,6 @@ function createPaymentRejectedNotification(params: { }; } - - /** * Creates a server-side middleware that gates priced requests until payment is verified. */ @@ -158,6 +154,14 @@ export function createServerPaymentsMiddleware(params: { return; } + if ( + ctx.paymentInteraction !== undefined && + ctx.paymentInteraction !== 'transparent' + ) { + await forward(message); + return; + } + const priced = matchPricedCapability(message, options.pricedCapabilities); if (!priced) { await forward(message); @@ -190,21 +194,11 @@ export function createServerPaymentsMiddleware(params: { // IMPORTANT: set pending state synchronously before any await to make idempotency atomic. const inFlight = (async (): Promise => { - const clientPmis = ctx.clientPmis; - - const chosenPmi = clientPmis - ? clientPmis.find((pmi) => processorsByPmi.has(pmi)) - : undefined; - - const chosenProcessor = chosenPmi - ? processorsByPmi.get(chosenPmi) - : options.processors[0]; - - if (!chosenProcessor) { - throw new Error('No payment processors configured'); - } - - const processor = chosenProcessor; + const processor = resolvePaymentProcessor( + ctx.clientPmis, + processorsByPmi, + options.processors, + ); const quote = options.resolvePrice ? await options.resolvePrice({ diff --git a/src/payments/server-transport-payments.ts b/src/payments/server-transport-payments.ts index ca0b1c1..1718063 100644 --- a/src/payments/server-transport-payments.ts +++ b/src/payments/server-transport-payments.ts @@ -15,11 +15,11 @@ export function withServerPayments( ): NostrServerTransport { // CEP-8 discovery tags: advertise supported PMIs + reference pricing on announcement/list events. const extraTags: string[][] = createPmiTagsFromProcessors(options.processors); - + if (options.paymentInteraction === 'explicit_gating') { extraTags.push(['payment_interaction', 'explicit_gating']); } - + transport.setAnnouncementExtraTags(extraTags); transport.setAnnouncementPricingTags( createCapTagsFromPricedCapabilities(options.pricedCapabilities), @@ -28,6 +28,10 @@ export function withServerPayments( // Expose the configured payment interaction mode to the transport coordinator. transport.setSupportedPaymentInteraction(options.paymentInteraction); + transport.addInboundMiddleware( + createServerPaymentsMiddleware({ sender: transport, options }), + ); + if (options.paymentInteraction === 'explicit_gating') { const authorizationStore = new AuthorizationStore({}); transport.addInboundMiddleware( @@ -35,14 +39,14 @@ export function withServerPayments( options, authorizationStore, sendResponse: async (clientPubkey, response, requestEventId) => { - await transport.sendTargetedResponse(clientPubkey, response, requestEventId); + await transport.sendTargetedResponse( + clientPubkey, + response, + requestEventId, + ); }, }), ); - } else { - transport.addInboundMiddleware( - createServerPaymentsMiddleware({ sender: transport, options }), - ); } return transport; } diff --git a/src/payments/types.ts b/src/payments/types.ts index 395eac0..aa364cb 100644 --- a/src/payments/types.ts +++ b/src/payments/types.ts @@ -88,7 +88,10 @@ export interface PaymentPendingErrorData { } /** Nostr `payment_interaction` tag as defined by CEP-8. */ -export type PaymentInteractionTag = ['payment_interaction', PaymentInteractionMode]; +export type PaymentInteractionTag = [ + 'payment_interaction', + PaymentInteractionMode, +]; /** * Canonical invocation identity for explicit-gating authorization matching. @@ -288,6 +291,11 @@ export interface ServerPaymentsContext { * Source: Nostr event tags (e.g. multiple `['pmi', '']`). */ clientPmis?: readonly string[]; + + /** + * The negotiated payment interaction mode for the session. + */ + paymentInteraction?: PaymentInteractionMode; } /** diff --git a/src/transport/capability-negotiator.ts b/src/transport/capability-negotiator.ts index ad118e9..56acc81 100644 --- a/src/transport/capability-negotiator.ts +++ b/src/transport/capability-negotiator.ts @@ -7,6 +7,7 @@ import { EncryptionMode, GiftWrapMode } from '../core/interfaces.js'; import { type NostrEvent } from 'nostr-tools'; import { type ClientSession } from './nostr-server/session-store.js'; import { queryTags } from '../core/utils/utils.js'; +import type { PaymentInteractionMode } from '../payments/types.js'; const NON_DISCOVERY_TAG_NAMES = new Set(['e', 'p']); @@ -180,9 +181,10 @@ export class ServerCapabilityNegotiator { export class ClientCapabilityNegotiator { private hasSentDiscoveryTags = false; private clientPmis?: readonly string[]; - private paymentInteraction?: import('../payments/types.js').PaymentInteractionMode; + private paymentInteraction?: PaymentInteractionMode; private serverSupportsEphemeralGiftWraps = false; private _serverInitializeEvent?: NostrEvent; + private hasSentPaymentInteraction = false; constructor( private deps: { @@ -208,7 +210,7 @@ export class ClientCapabilityNegotiator { /** * Sets the requested payment interaction mode for negotiation. */ - public setPaymentInteraction(mode: import('../payments/types.js').PaymentInteractionMode): void { + public setPaymentInteraction(mode: PaymentInteractionMode): void { this.paymentInteraction = mode; } @@ -261,7 +263,11 @@ export class ClientCapabilityNegotiator { if (this.clientPmis) { tags.push(...this.clientPmis.map((pmi) => ['pmi', pmi])); } - if (this.paymentInteraction && this.paymentInteraction !== 'transparent') { + if ( + this.paymentInteraction && + this.paymentInteraction !== 'transparent' && + !this.hasSentPaymentInteraction + ) { tags.push(['payment_interaction', this.paymentInteraction]); } return tags; @@ -296,6 +302,9 @@ export class ClientCapabilityNegotiator { if (this.getPendingDiscoveryTags().length > 0) { this.hasSentDiscoveryTags = true; } + if (this.paymentInteraction && this.paymentInteraction !== 'transparent') { + this.hasSentPaymentInteraction = true; + } } /** diff --git a/src/transport/middleware.ts b/src/transport/middleware.ts index 2abb0dc..ba2ddca 100644 --- a/src/transport/middleware.ts +++ b/src/transport/middleware.ts @@ -4,11 +4,11 @@ import type { PaymentInteractionMode } from '../payments/types.js'; /** * Inbound middleware hook for server transports. - * - * @note Context relationship: `InboundMiddlewareFn`'s `ctx` is the authoritative source - * of per-request context, populated by the inbound coordinator from the session and - * inbound event tags. `ServerPaymentsContext` (used by `ServerMiddlewareFn`) is a subset - * of this context — it reads the same `paymentInteraction` field. The inbound coordinator + * + * @note Context relationship: `InboundMiddlewareFn`'s `ctx` is the authoritative source + * of per-request context, populated by the inbound coordinator from the session and + * inbound event tags. `ServerPaymentsContext` (used by `ServerMiddlewareFn`) is a subset + * of this context — it reads the same `paymentInteraction` field. The inbound coordinator * constructs both from the same session state, so they stay synchronized automatically. */ export type InboundMiddlewareFn = ( diff --git a/src/transport/nostr-client-transport.ts b/src/transport/nostr-client-transport.ts index fec0d71..042aaf8 100644 --- a/src/transport/nostr-client-transport.ts +++ b/src/transport/nostr-client-transport.ts @@ -48,6 +48,7 @@ import { DEFAULT_OVERSIZED_THRESHOLD, } from './oversized-transfer/constants.js'; import type { OpenStreamTransportPolicy } from './open-stream-policy.js'; +import type { PaymentInteractionMode } from '../payments/types.js'; /** * Options for configuring the NostrClientTransport. @@ -587,14 +588,14 @@ export class NostrClientTransport /** * Sets the requested payment interaction mode for negotiation. */ - public setPaymentInteraction(mode: import('../payments/types.js').PaymentInteractionMode): void { + public setPaymentInteraction(mode: PaymentInteractionMode): void { this.capabilityNegotiator.setPaymentInteraction(mode); } /** * Gets the effective payment interaction mode disclosed by the server. */ - public getEffectivePaymentInteraction(): import('../payments/types.js').PaymentInteractionMode | undefined { + public getEffectivePaymentInteraction(): PaymentInteractionMode | undefined { return this.metadataStore.getEffectivePaymentInteraction(); } diff --git a/src/transport/nostr-client/correlation-store.ts b/src/transport/nostr-client/correlation-store.ts index 1285255..c89f5aa 100644 --- a/src/transport/nostr-client/correlation-store.ts +++ b/src/transport/nostr-client/correlation-store.ts @@ -1,5 +1,6 @@ import type { JSONRPCResponse } from '@contextvm/mcp-sdk/types.js'; import { LruCache } from '../../core/utils/lru-cache.js'; +import type { JSONRPCRequest } from '@contextvm/mcp-sdk/types.js'; /** * Represents a pending request waiting for a response from the server. @@ -16,7 +17,7 @@ export interface PendingRequest { /** Minimal context about the original request (safe to store; no arguments). */ originalRequestContext?: OriginalRequestContext; /** The full raw original JSON-RPC request for explicit gating retries. */ - rawRequest?: import('@modelcontextprotocol/sdk/types.js').JSONRPCRequest; + rawRequest?: JSONRPCRequest; } /** @@ -79,7 +80,7 @@ export class ClientCorrelationStore { /** * Gets the raw original JSON-RPC request for explicit gating retries. */ - getRawRequest(eventId: string): import('@modelcontextprotocol/sdk/types.js').JSONRPCRequest | undefined { + getRawRequest(eventId: string): JSONRPCRequest | undefined { return this.pendingRequests.get(eventId)?.rawRequest; } diff --git a/src/transport/nostr-client/inbound-coordinator.ts b/src/transport/nostr-client/inbound-coordinator.ts index 09307a3..a74f6dd 100644 --- a/src/transport/nostr-client/inbound-coordinator.ts +++ b/src/transport/nostr-client/inbound-coordinator.ts @@ -20,6 +20,7 @@ import { type ClientCorrelationStore } from './correlation-store.js'; import { type UnwrappedClientEvent } from './event-pipeline.js'; import { type ClientInboundNotificationDispatcher } from './inbound-notification-dispatcher.js'; import { type ServerMetadataStore } from './server-metadata-store.js'; +import type { PaymentInteractionMode } from '../../payments/types.js'; export interface ClientInboundCoordinatorDeps { capabilityNegotiator: ClientCapabilityNegotiator; @@ -28,7 +29,11 @@ export interface ClientInboundCoordinatorDeps { metadataStore: ServerMetadataStore; unwrapEvent: (event: NostrEvent) => Promise; convertNostrEventToMcpMessage: (event: NostrEvent) => JSONRPCMessage | null; - handleResponse: (correlatedEventId: string, msg: JSONRPCMessage, eventId?: string) => void; + handleResponse: ( + correlatedEventId: string, + msg: JSONRPCMessage, + eventId?: string, + ) => void; handleNotification: ( eventId: string, correlatedEventId: string | undefined, @@ -196,13 +201,13 @@ export class ClientInboundCoordinator { ); const paymentInteractionTag = event.tags.find( - (tag) => tag[0] === 'payment_interaction' && typeof tag[1] === 'string' + (tag) => tag[0] === 'payment_interaction' && typeof tag[1] === 'string', ); if (paymentInteractionTag) { const mode = paymentInteractionTag[1]; if (mode === 'transparent' || mode === 'explicit_gating') { this.deps.metadataStore.setEffectivePaymentInteraction( - mode as import('../../payments/types.js').PaymentInteractionMode + mode as PaymentInteractionMode, ); } } diff --git a/src/transport/nostr-client/outbound-sender.ts b/src/transport/nostr-client/outbound-sender.ts index 02e5401..dda3ae5 100644 --- a/src/transport/nostr-client/outbound-sender.ts +++ b/src/transport/nostr-client/outbound-sender.ts @@ -10,6 +10,7 @@ import { } from './correlation-store.js'; import { type ClientCapabilityNegotiator } from '../capability-negotiator.js'; import { sendOversizedClientRequest } from './oversized-client-sender.js'; +import type { JSONRPCRequest } from '@contextvm/mcp-sdk/types.js'; export interface ClientOutboundSenderDeps { serverPubkey: string; @@ -146,7 +147,7 @@ export class ClientOutboundSender { progressToken: progressToken !== undefined ? String(progressToken) : undefined, originalRequestContext, - rawRequest: isRequest ? (message as import('@modelcontextprotocol/sdk/types.js').JSONRPCRequest) : undefined, + rawRequest: isRequest ? (message as JSONRPCRequest) : undefined, }); }, giftWrapKind, @@ -214,7 +215,7 @@ export class ClientOutboundSender { progressToken, originalRequestContext: this.deps.getOriginalRequestContext(originalMessage), - rawRequest: originalMessage as import('@modelcontextprotocol/sdk/types.js').JSONRPCRequest, + rawRequest: originalMessage as JSONRPCRequest, }); } diff --git a/src/transport/nostr-client/server-metadata-store.ts b/src/transport/nostr-client/server-metadata-store.ts index b9041f1..5471b99 100644 --- a/src/transport/nostr-client/server-metadata-store.ts +++ b/src/transport/nostr-client/server-metadata-store.ts @@ -6,6 +6,7 @@ import { type NostrEvent } from 'nostr-tools'; import { NOSTR_TAGS } from '../../core/constants.js'; import { getNostrEventTag } from '../../core/utils/serializers.js'; import { queryTags } from '../../core/utils/utils.js'; +import type { PaymentInteractionMode } from '../../payments/types.js'; export type ListEnvelopeType = 'tools' | 'resources' | 'templates' | 'prompts'; @@ -20,13 +21,13 @@ export class ServerMetadataStore { private serverResourceTemplatesListEvent: NostrEvent | undefined; private supportsOversizedTransfer = false; private supportsOpenStream = false; - private effectivePaymentInteraction?: import('../../payments/types.js').PaymentInteractionMode; + private effectivePaymentInteraction?: PaymentInteractionMode; - public setEffectivePaymentInteraction(mode: import('../../payments/types.js').PaymentInteractionMode): void { + public setEffectivePaymentInteraction(mode: PaymentInteractionMode): void { this.effectivePaymentInteraction = mode; } - public getEffectivePaymentInteraction(): import('../../payments/types.js').PaymentInteractionMode | undefined { + public getEffectivePaymentInteraction(): PaymentInteractionMode | undefined { return this.effectivePaymentInteraction; } diff --git a/src/transport/nostr-server-transport.ts b/src/transport/nostr-server-transport.ts index 9a33063..8b24f8e 100644 --- a/src/transport/nostr-server-transport.ts +++ b/src/transport/nostr-server-transport.ts @@ -52,6 +52,7 @@ import { ServerOpenStreamFactory } from './nostr-server/open-stream-factory.js'; import { ServerEventPipeline } from './nostr-server/event-pipeline.js'; import { ServerInboundCoordinator } from './nostr-server/inbound-coordinator.js'; import type { InboundMiddlewareFn } from './middleware.js'; +import type { PaymentInteractionMode } from '../payments/types.js'; export type { InboundMiddlewareFn } from './middleware.js'; /** @@ -490,7 +491,9 @@ export class NostrServerTransport /** * Sets the supported payment interaction mode for this server. */ - public setSupportedPaymentInteraction(mode: import('../payments/types.js').PaymentInteractionMode | undefined): void { + public setSupportedPaymentInteraction( + mode: PaymentInteractionMode | undefined, + ): void { this.inboundCoordinator.setSupportedPaymentInteraction(mode); } @@ -707,7 +710,11 @@ export class NostrServerTransport response: JSONRPCResponse | JSONRPCErrorResponse, requestEventId: string, ): Promise { - await this.outboundResponseRouter.routeTargeted(clientPubkey, response, requestEventId); + await this.outboundResponseRouter.routeTargeted( + clientPubkey, + response, + requestEventId, + ); } /** diff --git a/src/transport/nostr-server/inbound-coordinator.ts b/src/transport/nostr-server/inbound-coordinator.ts index 8beaa18..643945c 100644 --- a/src/transport/nostr-server/inbound-coordinator.ts +++ b/src/transport/nostr-server/inbound-coordinator.ts @@ -27,6 +27,7 @@ import { import { GiftWrapMode } from '../../core/interfaces.js'; import { type OpenStreamWriter } from '../open-stream/index.js'; import { UNSUPPORTED_PAYMENT_INTERACTION_ERROR_CODE } from '../../payments/constants.js'; +import type { PaymentInteractionMode } from '../../payments/types.js'; export interface ServerInboundCoordinatorDeps { sessionStore: SessionStore; @@ -39,7 +40,7 @@ export interface ServerInboundCoordinatorDeps { oversizedEnabled: boolean; openStreamEnabled: boolean; giftWrapMode: GiftWrapMode; - supportedPaymentInteraction?: import('../../payments/types.js').PaymentInteractionMode; + supportedPaymentInteraction?: PaymentInteractionMode; sendMcpMessage: ( msg: JSONRPCMessage, pubkey: string, @@ -77,7 +78,9 @@ export class ServerInboundCoordinator { this.inboundNotificationDispatcher = dispatcher; } - public setSupportedPaymentInteraction(mode: import('../../payments/types.js').PaymentInteractionMode | undefined): void { + public setSupportedPaymentInteraction( + mode: PaymentInteractionMode | undefined, + ): void { this.deps.supportedPaymentInteraction = mode; } @@ -170,19 +173,19 @@ export class ServerInboundCoordinator { const clientPmis = event.tags .filter((tag) => tag[0] === 'pmi' && typeof tag[1] === 'string') .map((tag) => tag[1] as string); - + const serverSupportsExplicitGating = this.deps.supportedPaymentInteraction === 'explicit_gating'; const paymentInteractionTag = event.tags.find( - (tag) => tag[0] === 'payment_interaction' && typeof tag[1] === 'string' + (tag) => tag[0] === 'payment_interaction' && typeof tag[1] === 'string', ); - + if (paymentInteractionTag && !session.requestedPaymentInteraction) { const mode = paymentInteractionTag[1]; if (mode === 'transparent' || mode === 'explicit_gating') { - session.requestedPaymentInteraction = mode as import('../../payments/types.js').PaymentInteractionMode; - + session.requestedPaymentInteraction = mode as PaymentInteractionMode; + if (mode === 'explicit_gating' && !serverSupportsExplicitGating) { session.effectivePaymentInteraction = 'transparent'; @@ -192,7 +195,8 @@ export class ServerInboundCoordinator { id: inboundMessage.id, error: { code: UNSUPPORTED_PAYMENT_INTERACTION_ERROR_CODE, - message: 'Unsupported payment_interaction mode: explicit_gating', + message: + 'Unsupported payment_interaction mode: explicit_gating', }, }; const tags = this.deps.createResponseTags(event.pubkey, event.id); @@ -213,9 +217,12 @@ export class ServerInboundCoordinator { : undefined, ) .catch((err) => { - this.deps.logger.error('Failed to send negotiation error response', { - error: err instanceof Error ? err.message : String(err), - }); + this.deps.logger.error( + 'Failed to send negotiation error response', + { + error: err instanceof Error ? err.message : String(err), + }, + ); }); return; } @@ -233,7 +240,8 @@ export class ServerInboundCoordinator { const ctx = { clientPubkey: event.pubkey, clientPmis: clientPmis.length > 0 ? clientPmis : undefined, - paymentInteraction: session.effectivePaymentInteraction ?? 'transparent', + paymentInteraction: + session.effectivePaymentInteraction ?? 'transparent', }; const middlewares = this.deps.inboundMiddlewares; diff --git a/src/transport/nostr-server/outbound-response-router.ts b/src/transport/nostr-server/outbound-response-router.ts index df4ce3d..238e5a7 100644 --- a/src/transport/nostr-server/outbound-response-router.ts +++ b/src/transport/nostr-server/outbound-response-router.ts @@ -229,17 +229,8 @@ export class OutboundResponseRouter { baseTags: this.deps.createResponseTags(route.clientPubkey, nostrEventId), session, }); - - // CEP-8: Disclose effective mode on first response if client requested a non-default mode - if ( - session.requestedPaymentInteraction && - session.requestedPaymentInteraction !== 'transparent' && - !session.hasDisclosedPaymentInteraction && - session.effectivePaymentInteraction - ) { - tags.push(['payment_interaction', session.effectivePaymentInteraction]); - session.hasDisclosedPaymentInteraction = true; - } + + this.maybeAppendPaymentInteractionDisclosure(tags, session); const giftWrapKind = this.deps.chooseGiftWrapKind({ session, @@ -304,17 +295,8 @@ export class OutboundResponseRouter { baseTags: this.deps.createResponseTags(clientPubkey, requestEventId), session, }); - - // CEP-8: Disclose effective mode on first response if client requested a non-default mode - if ( - session.requestedPaymentInteraction && - session.requestedPaymentInteraction !== 'transparent' && - !session.hasDisclosedPaymentInteraction && - session.effectivePaymentInteraction - ) { - tags.push(['payment_interaction', session.effectivePaymentInteraction]); - session.hasDisclosedPaymentInteraction = true; - } + + this.maybeAppendPaymentInteractionDisclosure(tags, session); const giftWrapKind = this.deps.chooseGiftWrapKind({ session, @@ -330,4 +312,20 @@ export class OutboundResponseRouter { giftWrapKind, ); } + + private maybeAppendPaymentInteractionDisclosure( + tags: string[][], + session: ClientSession, + ): void { + // CEP-8: Disclose effective mode on first response if client requested a non-default mode + if ( + session.requestedPaymentInteraction && + session.requestedPaymentInteraction !== 'transparent' && + !session.hasDisclosedPaymentInteraction && + session.effectivePaymentInteraction + ) { + tags.push(['payment_interaction', session.effectivePaymentInteraction]); + session.hasDisclosedPaymentInteraction = true; + } + } } diff --git a/src/transport/nostr-server/session-store.ts b/src/transport/nostr-server/session-store.ts index 881f308..169d81d 100644 --- a/src/transport/nostr-server/session-store.ts +++ b/src/transport/nostr-server/session-store.ts @@ -6,6 +6,7 @@ */ import { DEFAULT_LRU_SIZE } from '../../core/constants.js'; import { LruCache } from '../../core/utils/lru-cache.js'; +import type { PaymentInteractionMode } from '../../payments/types.js'; /** * Represents a connected client session. * Simplified from the original design - correlation data is now @@ -27,9 +28,9 @@ export interface ClientSession { /** Whether the client has advertised CEP-41 open stream support. */ supportsOpenStream: boolean; /** Client-requested payment interaction mode (from first message). */ - requestedPaymentInteraction?: import('../../payments/types.js').PaymentInteractionMode; + requestedPaymentInteraction?: PaymentInteractionMode; /** Effective payment interaction mode for this session. */ - effectivePaymentInteraction?: import('../../payments/types.js').PaymentInteractionMode; + effectivePaymentInteraction?: PaymentInteractionMode; /** Whether the effective mode has been disclosed on the first response. */ hasDisclosedPaymentInteraction?: boolean; } diff --git a/src/transport/payments-flow.test.ts b/src/transport/payments-flow.test.ts index 00e21bd..84c6134 100644 --- a/src/transport/payments-flow.test.ts +++ b/src/transport/payments-flow.test.ts @@ -1016,7 +1016,10 @@ describe.serial('payments fake flow (transport-level)', () => { const serverPrivateKey = bytesToHex(serverSK); const serverPublicKey = getPublicKey(serverSK); - const mcpServer = new McpServer({ name: 'explicit-server', version: '1.0.0' }); + const mcpServer = new McpServer({ + name: 'explicit-server', + version: '1.0.0', + }); let toolCallCount = 0; mcpServer.registerTool( 'add', @@ -1061,7 +1064,7 @@ describe.serial('payments fake flow (transport-level)', () => { const clientSK = generateSecretKey(); const clientPrivateKey = bytesToHex(clientSK); - + // Track if onPaymentRequired was called let explicitPaymentHandled = false; @@ -1077,7 +1080,7 @@ describe.serial('payments fake flow (transport-level)', () => { onPaymentRequired: async () => { explicitPaymentHandled = true; return { paid: true }; - } + }, }); const client = new Client({ name: 'explicit-client', version: '1.0.0' }); @@ -1092,7 +1095,7 @@ describe.serial('payments fake flow (transport-level)', () => { content: Array<{ type: string; text?: string }>; }; expect(typedResult.content[0]).toMatchObject({ type: 'text', text: '30' }); - + expect(explicitPaymentHandled).toBe(true); expect(toolCallCount).toBe(1); expect(createSpy).toHaveBeenCalled(); From c3be16300b64159c2949056b8eefdbf81d6b2800 Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Wed, 17 Jun 2026 00:02:44 +0530 Subject: [PATCH 09/19] Fix lint issue in canonical-identity.test.ts --- src/payments/canonical-identity.test.ts | 2 +- src/transport/nostr-client/correlation-store.ts | 3 +-- src/transport/nostr-client/outbound-sender.ts | 3 +-- 3 files changed, 3 insertions(+), 5 deletions(-) diff --git a/src/payments/canonical-identity.test.ts b/src/payments/canonical-identity.test.ts index dd60028..c9286b8 100644 --- a/src/payments/canonical-identity.test.ts +++ b/src/payments/canonical-identity.test.ts @@ -73,7 +73,7 @@ describe('Canonical Invocation Identity', () => { }); test('throws error for circular references', () => { - const obj: any = {}; + const obj: Record = {}; obj.self = obj; expect(() => computeCanonicalInvocationHash('tools/call', obj)).toThrow( "Failed to canonicalize invocation payload for method 'tools/call'. Ensure params contain only JSON-serializable values (no circular references, functions, symbols, or BigInt).", diff --git a/src/transport/nostr-client/correlation-store.ts b/src/transport/nostr-client/correlation-store.ts index c89f5aa..e181043 100644 --- a/src/transport/nostr-client/correlation-store.ts +++ b/src/transport/nostr-client/correlation-store.ts @@ -1,6 +1,5 @@ -import type { JSONRPCResponse } from '@contextvm/mcp-sdk/types.js'; +import type { JSONRPCResponse , JSONRPCRequest } from '@contextvm/mcp-sdk/types.js'; import { LruCache } from '../../core/utils/lru-cache.js'; -import type { JSONRPCRequest } from '@contextvm/mcp-sdk/types.js'; /** * Represents a pending request waiting for a response from the server. diff --git a/src/transport/nostr-client/outbound-sender.ts b/src/transport/nostr-client/outbound-sender.ts index dda3ae5..2aee869 100644 --- a/src/transport/nostr-client/outbound-sender.ts +++ b/src/transport/nostr-client/outbound-sender.ts @@ -1,7 +1,7 @@ import { type JSONRPCMessage, isJSONRPCRequest, -} from '@contextvm/mcp-sdk/types.js'; + JSONRPCRequest } from '@contextvm/mcp-sdk/types.js'; import { CTXVM_MESSAGES_KIND, INITIALIZE_METHOD } from '../../core/index.js'; import { type Logger } from '../../core/utils/logger.js'; import { @@ -10,7 +10,6 @@ import { } from './correlation-store.js'; import { type ClientCapabilityNegotiator } from '../capability-negotiator.js'; import { sendOversizedClientRequest } from './oversized-client-sender.js'; -import type { JSONRPCRequest } from '@contextvm/mcp-sdk/types.js'; export interface ClientOutboundSenderDeps { serverPubkey: string; From 723c520a74cf3d2ec4b101416d86c6fe6649a38c Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Wed, 17 Jun 2026 23:18:11 +0530 Subject: [PATCH 10/19] Fix final consistency gaps and test coverage for CEP-8 explicit gating --- src/payments/server-explicit-gating.test.ts | 25 ++++ src/payments/server-explicit-gating.ts | 84 +++++++------- src/payments/server-payments-utils.ts | 93 +++++++++++++++ src/payments/server-payments.ts | 109 +++++++----------- src/transport/capability-negotiator.ts | 4 +- .../nostr-client/correlation-store.ts | 2 +- src/transport/nostr-client/outbound-sender.ts | 6 +- src/transport/nostr-server-transport.test.ts | 43 +++++++ .../nostr-server/outbound-response-router.ts | 3 + 9 files changed, 254 insertions(+), 115 deletions(-) diff --git a/src/payments/server-explicit-gating.test.ts b/src/payments/server-explicit-gating.test.ts index e3e94b2..b786e02 100644 --- a/src/payments/server-explicit-gating.test.ts +++ b/src/payments/server-explicit-gating.test.ts @@ -90,6 +90,31 @@ describe('Explicit Gating Middleware', () => { expect(data.payment_options[0].pay_req).toBe('pay_req'); }); + test('forwards request directly if client is using legacy transparent mode', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [processor], + pricedCapabilities: [...pricedCapabilities], + }, + authorizationStore: store, + sendResponse: async (_pubkey, response) => { + sentResponses.push(response); + }, + }); + + let forwarded = false; + const legacyCtx = { ...ctx, paymentInteraction: 'transparent' as const }; + await mw(message, legacyCtx, async () => { + forwarded = true; + }); + + expect(forwarded).toBe(true); + expect(sentResponses.length).toBe(0); + }); + test('emits -32043 Payment Pending if already pending', async () => { const store = new AuthorizationStore(); const sentResponses: JSONRPCErrorResponse[] = []; diff --git a/src/payments/server-explicit-gating.ts b/src/payments/server-explicit-gating.ts index be9495a..2d47405 100644 --- a/src/payments/server-explicit-gating.ts +++ b/src/payments/server-explicit-gating.ts @@ -5,11 +5,8 @@ import type { ServerPaymentsOptions } from './server-payments.js'; import type { AuthorizationStore } from './authorization-store.js'; import { computeCanonicalInvocationIdentity } from './canonical-identity.js'; import { - getVerificationTimeoutMs, matchPricedCapability, - isResolvePriceRejection, - isResolvePriceWaiver, - resolvePaymentProcessor, + resolveAndInitiatePayment, } from './server-payments-utils.js'; import { createLogger } from '../core/utils/logger.js'; import { withTimeout } from '../core/utils/utils.js'; @@ -34,6 +31,17 @@ export function createExplicitGatingMiddleware( const { options, authorizationStore, sendResponse } = params; const logger = createLogger('server-explicit-gating'); + // Warn on duplicate PMI processors — Map construction silently keeps only the last. + const seenProcessorPmis = new Set(); + for (const p of options.processors) { + if (seenProcessorPmis.has(p.pmi)) { + logger.warn('duplicate PMI processor registered, last one wins', { + pmi: p.pmi, + }); + } + seenProcessorPmis.add(p.pmi); + } + const processorsByPmi = new Map( options.processors.map((p) => [p.pmi, p] as const), ); @@ -107,27 +115,22 @@ export function createExplicitGatingMiddleware( // 3. Resolve price and initiate new payment try { - const processor = resolvePaymentProcessor( - ctx.clientPmis, + const initResult = await resolveAndInitiatePayment({ + message, + priced, + requestEventId, + clientPubkey: ctx.clientPubkey, + clientPmis: ctx.clientPmis, + options, processorsByPmi, - options.processors, - ); - - const quote = options.resolvePrice - ? await options.resolvePrice({ - capability: priced, - request: message, - clientPubkey: ctx.clientPubkey, - requestEventId, - }) - : { amount: priced.amount, description: priced.description }; + }); - if (isResolvePriceRejection(quote)) { + if (initResult.kind === 'rejected') { logger.info('payment rejected', { requestEventId, - pmi: processor.pmi, + pmi: initResult.pmi, amount: priced.amount, - reason: quote.message, + reason: initResult.message, }); authorizationStore.clearPending(identity); @@ -139,14 +142,14 @@ export function createExplicitGatingMiddleware( id: message.id, error: { code: -32000, - message: quote.message || 'Payment rejected by policy', + message: initResult.message || 'Payment rejected by policy', }, }; await sendResponse(ctx.clientPubkey, errorResponse, requestEventId); return; } - if (isResolvePriceWaiver(quote)) { + if (initResult.kind === 'waived') { logger.debug('payment waived, forwarding priced request', { requestEventId, method: message.method, @@ -157,30 +160,21 @@ export function createExplicitGatingMiddleware( return; } - const resolvedQuote = quote; - const paymentRequired = await processor.createPaymentRequired({ - amount: resolvedQuote.amount, - description: resolvedQuote.description, - requestEventId, - clientPubkey: ctx.clientPubkey, - }); + const { paymentRequired, mergedMeta, processor, verifyTimeoutMs } = initResult; - const mergedMeta = - resolvedQuote.meta === undefined && paymentRequired._meta === undefined - ? undefined - : { - ...(paymentRequired._meta ?? {}), - ...(resolvedQuote.meta ?? {}), - }; + // Use the strict verification timeout bound for polling + const pollingTimeoutMs = Math.min(verifyTimeoutMs, paymentTtlMs); - // Ensure pending TTL matches the payment request TTL - const verifyTimeoutMs = getVerificationTimeoutMs({ - ttlSeconds: paymentRequired.ttl, - }); - const effectiveTimeoutMs = Math.min(verifyTimeoutMs, paymentTtlMs); + // Note: use the original payment request's TTL as the limit for the grant, not the verify timeout. + // verifyTimeoutMs includes standard bounds, but for grants we want to honor the + // payment option's TTL explicitly if it is smaller, or the fallback paymentTtlMs. + const grantTtlMs = + paymentRequired.ttl !== undefined + ? paymentRequired.ttl * 1000 + : paymentTtlMs; // Update pending with the precise TTL - authorizationStore.updatePendingTtl(identity, effectiveTimeoutMs); + authorizationStore.updatePendingTtl(identity, grantTtlMs); const errorResponse: JSONRPCErrorResponse = { jsonrpc: '2.0', @@ -222,7 +216,7 @@ export function createExplicitGatingMiddleware( logger.debug('verifying explicit payment', { requestEventId, pmi: paymentRequired.pmi, - timeoutMs: effectiveTimeoutMs, + timeoutMs: pollingTimeoutMs, }); await withTimeout( @@ -232,7 +226,7 @@ export function createExplicitGatingMiddleware( clientPubkey: ctx.clientPubkey, abortSignal: controller.signal, }), - effectiveTimeoutMs, + pollingTimeoutMs, 'verifyPayment timed out', ); @@ -242,7 +236,7 @@ export function createExplicitGatingMiddleware( amount: paymentRequired.amount, }); - authorizationStore.grant(identity, effectiveTimeoutMs); + authorizationStore.grant(identity, grantTtlMs); } catch (err) { logger.info('explicit payment verification failed or timed out', { requestEventId, diff --git a/src/payments/server-payments-utils.ts b/src/payments/server-payments-utils.ts index 94ccc06..8644d08 100644 --- a/src/payments/server-payments-utils.ts +++ b/src/payments/server-payments-utils.ts @@ -5,6 +5,7 @@ import type { ResolvePriceWaiver, ResolvePriceResult, PaymentProcessor, + PaymentRequired, } from './types.js'; export function getVerificationTimeoutMs(params: { @@ -86,3 +87,95 @@ export function resolvePaymentProcessor( return chosenProcessor; } + +export type InitiationResult = + | { + kind: 'rejected'; + pmi: string; + amount: number; + message?: string; + quote: ResolvePriceRejection; + } + | { kind: 'waived' } + | { + kind: 'payment_required'; + processor: PaymentProcessor; + paymentRequired: PaymentRequired; + mergedMeta: Record | undefined; + verifyTimeoutMs: number; + }; + +export async function resolveAndInitiatePayment(params: { + message: JSONRPCRequest; + priced: PricedCapability; + requestEventId: string; + clientPubkey: string; + clientPmis: readonly string[] | undefined; + options: { + processors: readonly PaymentProcessor[]; + resolvePrice?: (params: { + capability: PricedCapability; + request: JSONRPCRequest; + clientPubkey: string; + requestEventId: string; + }) => Promise; + }; + processorsByPmi: Map; +}): Promise { + const processor = resolvePaymentProcessor( + params.clientPmis, + params.processorsByPmi, + params.options.processors, + ); + + const quote = params.options.resolvePrice + ? await params.options.resolvePrice({ + capability: params.priced, + request: params.message, + clientPubkey: params.clientPubkey, + requestEventId: params.requestEventId, + }) + : { amount: params.priced.amount, description: params.priced.description }; + + if (isResolvePriceRejection(quote)) { + return { + kind: 'rejected', + pmi: processor.pmi, + amount: params.priced.amount, + message: quote.message, + quote, + }; + } + + if (isResolvePriceWaiver(quote)) { + return { kind: 'waived' }; + } + + const resolvedQuote = quote; + const paymentRequired = await processor.createPaymentRequired({ + amount: resolvedQuote.amount, + description: resolvedQuote.description, + requestEventId: params.requestEventId, + clientPubkey: params.clientPubkey, + }); + + const mergedMeta = + resolvedQuote.meta === undefined && paymentRequired._meta === undefined + ? undefined + : { + ...(paymentRequired._meta ?? {}), + ...(resolvedQuote.meta ?? {}), + }; + + const verifyTimeoutMs = getVerificationTimeoutMs({ + ttlSeconds: paymentRequired.ttl, + }); + + return { + kind: 'payment_required', + processor, + paymentRequired, + mergedMeta, + verifyTimeoutMs, + }; +} diff --git a/src/payments/server-payments.ts b/src/payments/server-payments.ts index f35908c..573eb6d 100644 --- a/src/payments/server-payments.ts +++ b/src/payments/server-payments.ts @@ -21,11 +21,8 @@ import { PAYMENT_REQUIRED_METHOD, } from './constants.js'; import { - getVerificationTimeoutMs, matchPricedCapability, - isResolvePriceRejection, - isResolvePriceWaiver, - resolvePaymentProcessor, + resolveAndInitiatePayment, } from './server-payments-utils.js'; export interface ServerPaymentsOptions { @@ -194,34 +191,29 @@ export function createServerPaymentsMiddleware(params: { // IMPORTANT: set pending state synchronously before any await to make idempotency atomic. const inFlight = (async (): Promise => { - const processor = resolvePaymentProcessor( - ctx.clientPmis, + const initResult = await resolveAndInitiatePayment({ + message, + priced, + requestEventId, + clientPubkey: ctx.clientPubkey, + clientPmis: ctx.clientPmis, + options, processorsByPmi, - options.processors, - ); - - const quote = options.resolvePrice - ? await options.resolvePrice({ - capability: priced, - request: message, - clientPubkey: ctx.clientPubkey, - requestEventId, - }) - : { amount: priced.amount, description: priced.description }; + }); // Handle rejection: emit payment_rejected and do not forward. - if (isResolvePriceRejection(quote)) { + if (initResult.kind === 'rejected') { logger.info('payment rejected', { requestEventId, - pmi: processor.pmi, + pmi: initResult.pmi, amount: priced.amount, - reason: quote.message, + reason: initResult.message, }); const rejectedNotification = createPaymentRejectedNotification({ - pmi: processor.pmi, + pmi: initResult.pmi, amount: priced.amount, - message: quote.message, + message: initResult.message, }); await sender.sendNotification( @@ -229,62 +221,50 @@ export function createServerPaymentsMiddleware(params: { rejectedNotification, requestEventId, ); - } else if (isResolvePriceWaiver(quote)) { + return; + } + + if (initResult.kind === 'waived') { logger.debug('payment waived, forwarding priced request', { requestEventId, method: message.method, }); await forward(message); - } else { - const resolvedQuote = quote; - const paymentRequired = await processor.createPaymentRequired({ - amount: resolvedQuote.amount, - description: resolvedQuote.description, - requestEventId, - clientPubkey: ctx.clientPubkey, - }); + return; + } - const mergedMeta = - resolvedQuote.meta === undefined && - paymentRequired._meta === undefined - ? undefined - : { - ...(paymentRequired._meta ?? {}), - ...(resolvedQuote.meta ?? {}), - }; + const { paymentRequired, mergedMeta, processor, verifyTimeoutMs } = initResult; - const requiredNotification = createPaymentRequiredNotification({ - amount: paymentRequired.amount, - pay_req: paymentRequired.pay_req, - pmi: paymentRequired.pmi, - description: paymentRequired.description, - ttl: paymentRequired.ttl, - _meta: mergedMeta, - }); + const requiredNotification = createPaymentRequiredNotification({ + amount: paymentRequired.amount, + pay_req: paymentRequired.pay_req, + pmi: paymentRequired.pmi, + description: paymentRequired.description, + ttl: paymentRequired.ttl, + _meta: mergedMeta, + }); - logger.info('payment required notification sent', { - requestEventId, - pmi: paymentRequired.pmi, - amount: paymentRequired.amount, - ttl: paymentRequired.ttl, - }); + logger.info('payment required notification sent', { + requestEventId, + pmi: paymentRequired.pmi, + amount: paymentRequired.amount, + ttl: paymentRequired.ttl, + }); - await sender.sendNotification( - ctx.clientPubkey, - requiredNotification, - requestEventId, - ); + await sender.sendNotification( + ctx.clientPubkey, + requiredNotification, + requestEventId, + ); - const verifyTimeoutMs = getVerificationTimeoutMs({ - ttlSeconds: paymentRequired.ttl, - }); - const effectiveTimeoutMs = Math.min(verifyTimeoutMs, paymentTtlMs); + // Use the strict verification timeout bound for polling + const pollingTimeoutMs = Math.min(verifyTimeoutMs, paymentTtlMs); logger.debug('verifying payment', { requestEventId, pmi: paymentRequired.pmi, - timeoutMs: effectiveTimeoutMs, + timeoutMs: pollingTimeoutMs, }); const controller = new AbortController(); @@ -295,7 +275,7 @@ export function createServerPaymentsMiddleware(params: { clientPubkey: ctx.clientPubkey, abortSignal: controller.signal, }), - effectiveTimeoutMs, + pollingTimeoutMs, 'verifyPayment timed out', ).finally(() => controller.abort()); @@ -323,7 +303,6 @@ export function createServerPaymentsMiddleware(params: { }); await forward(message); - } })(); const state: PendingPaymentState = { diff --git a/src/transport/capability-negotiator.ts b/src/transport/capability-negotiator.ts index 56acc81..d73fd08 100644 --- a/src/transport/capability-negotiator.ts +++ b/src/transport/capability-negotiator.ts @@ -269,6 +269,7 @@ export class ClientCapabilityNegotiator { !this.hasSentPaymentInteraction ) { tags.push(['payment_interaction', this.paymentInteraction]); + this.hasSentPaymentInteraction = true; } return tags; } @@ -302,9 +303,6 @@ export class ClientCapabilityNegotiator { if (this.getPendingDiscoveryTags().length > 0) { this.hasSentDiscoveryTags = true; } - if (this.paymentInteraction && this.paymentInteraction !== 'transparent') { - this.hasSentPaymentInteraction = true; - } } /** diff --git a/src/transport/nostr-client/correlation-store.ts b/src/transport/nostr-client/correlation-store.ts index e181043..524e429 100644 --- a/src/transport/nostr-client/correlation-store.ts +++ b/src/transport/nostr-client/correlation-store.ts @@ -1,4 +1,4 @@ -import type { JSONRPCResponse , JSONRPCRequest } from '@contextvm/mcp-sdk/types.js'; +import type { JSONRPCResponse, JSONRPCRequest } from '@contextvm/mcp-sdk/types.js'; import { LruCache } from '../../core/utils/lru-cache.js'; /** diff --git a/src/transport/nostr-client/outbound-sender.ts b/src/transport/nostr-client/outbound-sender.ts index 2aee869..984f199 100644 --- a/src/transport/nostr-client/outbound-sender.ts +++ b/src/transport/nostr-client/outbound-sender.ts @@ -1,7 +1,8 @@ import { type JSONRPCMessage, isJSONRPCRequest, - JSONRPCRequest } from '@contextvm/mcp-sdk/types.js'; + type JSONRPCRequest, +} from '@contextvm/mcp-sdk/types.js'; import { CTXVM_MESSAGES_KIND, INITIALIZE_METHOD } from '../../core/index.js'; import { type Logger } from '../../core/utils/logger.js'; import { @@ -114,6 +115,9 @@ export class ClientOutboundSender { String(progressToken), giftWrapKind, ); + // Note: Oversized transfers skip markDiscoveryTagsSent() on this early return path. + // This is low risk in practice because oversized transfers only trigger for large payloads, + // and discovery negotiation usually happens early with small messages (like `initialize`). return 'oversized-transfer'; } } diff --git a/src/transport/nostr-server-transport.test.ts b/src/transport/nostr-server-transport.test.ts index c267cdf..30642fa 100644 --- a/src/transport/nostr-server-transport.test.ts +++ b/src/transport/nostr-server-transport.test.ts @@ -602,6 +602,49 @@ describe.serial('NostrServerTransport', () => { await server.close(); }, 10000); + test('should return -32602 if client requests explicit_gating but server does not support it', async () => { + const serverPrivateKey = bytesToHex(generateSecretKey()); + const serverPublicKey = getPublicKey(hexToBytes(serverPrivateKey)); + + const server = new McpServer({ + name: 'Test Server', + version: '1.0.0', + }); + + const serverTransport = new NostrServerTransport({ + signer: new PrivateKeySigner(serverPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + }); + // Server does NOT configure explicit_gating + await server.connect(serverTransport); + + const clientPrivateKey = bytesToHex(generateSecretKey()); + const { client, clientNostrTransport } = createClientAndTransport( + clientPrivateKey, + 'Test Client', + serverPublicKey, + ); + + // Client requests explicit gating + clientNostrTransport.setPaymentInteraction('explicit_gating'); + + // connect() sends `initialize` request, server should return -32602 error + let connectError: unknown; + try { + await client.connect(clientNostrTransport); + } catch (e: unknown) { + connectError = e; + } + + expect(connectError).toBeDefined(); + // MCP client wraps JSON-RPC errors. The underlying code should be -32602 + expect((connectError as { code: number }).code).toBe(-32602); + expect((connectError as { message: string }).message).toContain('Unsupported payment_interaction mode'); + + await server.close(); + await clientNostrTransport.close(); + }, 10000); + test('should allow call excluded capabilities for disallowed public keys', async () => { // Use a unique server key per test to avoid cross-pollution with concurrent files. const serverPrivateKey = bytesToHex(generateSecretKey()); diff --git a/src/transport/nostr-server/outbound-response-router.ts b/src/transport/nostr-server/outbound-response-router.ts index 238e5a7..00c06d7 100644 --- a/src/transport/nostr-server/outbound-response-router.ts +++ b/src/transport/nostr-server/outbound-response-router.ts @@ -220,6 +220,9 @@ export class OutboundResponseRouter { logger: this.deps.logger, }, ); + // Note: Oversized transfers skip maybeAppendPaymentInteractionDisclosure() and marking discovery + // tags as sent on this early return path. This is low risk in practice because oversized transfers + // only trigger for large payloads, and negotiation usually happens early with small messages. return; } } From 3095ed36d10d74f6433e5cf9cc70447fd7060db4 Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Wed, 17 Jun 2026 23:22:06 +0530 Subject: [PATCH 11/19] Export PaymentRequired type to fix build error --- src/payments/types.ts | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-) diff --git a/src/payments/types.ts b/src/payments/types.ts index aa364cb..1e6c939 100644 --- a/src/payments/types.ts +++ b/src/payments/types.ts @@ -257,6 +257,19 @@ export type ResolvePriceFn = (params: { requestEventId: string; }) => Promise; +/** + * The structure returned by a PaymentProcessor when a new payment is issued. + */ +export interface PaymentRequired { + amount: number; + pay_req: string; + description?: string; + pmi: string; + /** Time-to-live in seconds (CEP-8). */ + ttl?: number; + _meta?: Record; +} + /** * Server-side module that can issue and verify payments for a single PMI. */ @@ -265,15 +278,9 @@ export interface PaymentProcessor { readonly pmi: string; /** Create a payment request for a specific capability invocation */ - createPaymentRequired(params: PaymentProcessorCreateParams): Promise<{ - amount: number; - pay_req: string; - description?: string; - pmi: string; - /** Time-to-live in seconds (CEP-8). */ - ttl?: number; - _meta?: Record; - }>; + createPaymentRequired( + params: PaymentProcessorCreateParams, + ): Promise; /** Wait for and/or verify settlement for a previously issued pay_req */ verifyPayment( From eabfc6930811a24f71705a7c3c278ff46622f099 Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Fri, 19 Jun 2026 22:55:56 +0530 Subject: [PATCH 12/19] chore: cleanup explicit gating after rebase --- src/payments/client-payments.test.ts | 21 ++--------- src/payments/client-payments.ts | 37 ++++++------------- src/payments/server-explicit-gating.ts | 10 +++-- src/payments/server-payments.ts | 1 - src/payments/server-transport-payments.ts | 3 +- src/transport/capability-negotiator.ts | 10 +++-- .../nostr-client/correlation-store.ts | 10 +---- .../nostr-client/inbound-coordinator.ts | 3 +- .../nostr-client/outbound-sender.test.ts | 4 +- src/transport/nostr-client/outbound-sender.ts | 13 +++---- .../nostr-server/inbound-coordinator.ts | 3 +- .../nostr-server/outbound-response-router.ts | 3 +- 12 files changed, 42 insertions(+), 76 deletions(-) diff --git a/src/payments/client-payments.test.ts b/src/payments/client-payments.test.ts index 692b83d..4e4b912 100644 --- a/src/payments/client-payments.test.ts +++ b/src/payments/client-payments.test.ts @@ -606,12 +606,7 @@ describe('withClientPayments()', () => { .correlationStore.registerRequest('req-event-id-3', { originalRequestId: 77, isInitialize: false, - rawRequest: { - jsonrpc: '2.0', - id: 77, - method: 'tools/call', - params: { name: 'test' }, - }, + originalRequestContext: { method: 'tools/call' }, }); @@ -674,12 +669,7 @@ describe('withClientPayments()', () => { .correlationStore.registerRequest('req-event-id-4', { originalRequestId: 88, isInitialize: false, - rawRequest: { - jsonrpc: '2.0', - id: 88, - method: 'tools/call', - params: { name: 'test' }, - }, + originalRequestContext: { method: 'tools/call' }, }); @@ -746,12 +736,7 @@ describe('withClientPayments()', () => { .correlationStore.registerRequest('req-event-id-5', { originalRequestId: 99, isInitialize: false, - rawRequest: { - jsonrpc: '2.0', - id: 99, - method: 'tools/call', - params: { name: 'test_pending' }, - }, + originalRequestContext: { method: 'tools/call' }, }); diff --git a/src/payments/client-payments.ts b/src/payments/client-payments.ts index 826e399..34db4a9 100644 --- a/src/payments/client-payments.ts +++ b/src/payments/client-payments.ts @@ -72,6 +72,16 @@ export interface ClientPaymentsOptions { /** Requested payment interaction mode. @default 'transparent' */ paymentInteraction?: PaymentInteractionMode; + /** + * Maximum number of -32043 (Payment Pending) retries before giving up. + * + * With retry_after=2 and 1.5× exponential backoff capped at 10s, the default + * of 10 retries gives ~45s of cumulative wait — enough for typical verification + * flows. Increase for slow payment processors (e.g. on-chain confirmation). + * @default 10 + */ + maxPendingRetries?: number; + /** * Handler for explicit-gating -32042 errors. * Called when a priced invocation returns Payment Required. @@ -232,7 +242,7 @@ export function withClientPayments( const pendingTimers = new Set>(); const retryCounts = new Map(); const rawRequestCache = new LruCache(1000); - const MAX_RETRIES = 5; + const MAX_RETRIES = options.maxPendingRetries ?? 10; const stopAllSyntheticProgress = (): void => { syntheticProgress.clear(); @@ -293,32 +303,7 @@ export function withClientPayments( const errorMsg = message as JSONRPCErrorResponse; const data = errorMsg.error.data as PaymentRequiredErrorData; - - // If we got here, we either: - // 1. Paid successfully but we need to signal the caller to retry (if we don't retry ourselves) - // 2. Failed to pay (policy, unhandled, or error) - // In both cases, for now we will just emit the -32042 error to `onmessage` and let - // the caller retry. To implement transparent retry at the transport level, we'd need - // to cache every outbound request, which is expensive. - onmessage?.(message); - return; - } - - if (isExplicitPaymentPendingError(message)) { - const data = message.error.data as import('./types.js').PaymentPendingErrorData; - const retryAfterSeconds = data.retry_after; - - // Note: For explicit gating errors (JSON-RPC error responses), the transport's - // correlation store has already consumed the pending entry via resolveResponse(). - // We rely on rawRequestCache for the retry rather than the correlation store. - - const requestId = message.id; - const rawRequest = requestId != null ? rawRequestCache.get(requestId) : undefined; - if (!rawRequest) { - logger.warn('missing raw original request, cannot retry explicit payment pending', { requestEventId }); -======= if (!options.onPaymentRequired) { ->>>>>>> e0d4c5b (Fix final review findings for CEP-8 explicit gating) onmessage?.(message); return; } diff --git a/src/payments/server-explicit-gating.ts b/src/payments/server-explicit-gating.ts index 2d47405..b955f5e 100644 --- a/src/payments/server-explicit-gating.ts +++ b/src/payments/server-explicit-gating.ts @@ -99,13 +99,15 @@ export function createExplicitGatingMiddleware( instructions: 'A payment is already pending for this invocation. Wait and retry.', // Suggest a short polling interval (e.g. 2 seconds) rather than the full TTL - retry_after: - Math.min( - 2, + retry_after: Math.min( + 2, + Math.max( + 1, Math.ceil( authorizationStore.getPendingRemainingMs(identity) / 1000, ), - ) || 2, + ), + ), }, }, }; diff --git a/src/payments/server-payments.ts b/src/payments/server-payments.ts index 573eb6d..8372cba 100644 --- a/src/payments/server-payments.ts +++ b/src/payments/server-payments.ts @@ -1,4 +1,3 @@ -import { type JSONRPCRequest } from '@contextvm/mcp-sdk/types.js'; import { isJsonRpcRequest } from './types.js'; import type { CorrelatedNotificationSender, diff --git a/src/payments/server-transport-payments.ts b/src/payments/server-transport-payments.ts index 1718063..4562ce8 100644 --- a/src/payments/server-transport-payments.ts +++ b/src/payments/server-transport-payments.ts @@ -5,6 +5,7 @@ import { createPmiTagsFromProcessors } from './pmi-tags.js'; import { createServerPaymentsMiddleware } from './server-payments.js'; import { createExplicitGatingMiddleware } from './server-explicit-gating.js'; import { AuthorizationStore } from './authorization-store.js'; +import { NOSTR_TAGS } from '../core/constants.js'; /** * Attaches CEP-8 payments gating to a NostrServerTransport. @@ -17,7 +18,7 @@ export function withServerPayments( const extraTags: string[][] = createPmiTagsFromProcessors(options.processors); if (options.paymentInteraction === 'explicit_gating') { - extraTags.push(['payment_interaction', 'explicit_gating']); + extraTags.push([NOSTR_TAGS.PAYMENT_INTERACTION, 'explicit_gating']); } transport.setAnnouncementExtraTags(extraTags); diff --git a/src/transport/capability-negotiator.ts b/src/transport/capability-negotiator.ts index d73fd08..4e724f5 100644 --- a/src/transport/capability-negotiator.ts +++ b/src/transport/capability-negotiator.ts @@ -268,8 +268,7 @@ export class ClientCapabilityNegotiator { this.paymentInteraction !== 'transparent' && !this.hasSentPaymentInteraction ) { - tags.push(['payment_interaction', this.paymentInteraction]); - this.hasSentPaymentInteraction = true; + tags.push([NOSTR_TAGS.PAYMENT_INTERACTION, this.paymentInteraction]); } return tags; } @@ -297,12 +296,15 @@ export class ClientCapabilityNegotiator { } /** - * Marks discovery tags as sent to prevent re-sending. + * Marks discovery and negotiation tags as sent to prevent re-sending. */ - public markDiscoveryTagsSent(): void { + public markNegotiationTagsSent(): void { if (this.getPendingDiscoveryTags().length > 0) { this.hasSentDiscoveryTags = true; } + if (this.paymentInteraction && this.paymentInteraction !== 'transparent') { + this.hasSentPaymentInteraction = true; + } } /** diff --git a/src/transport/nostr-client/correlation-store.ts b/src/transport/nostr-client/correlation-store.ts index 524e429..ce7e809 100644 --- a/src/transport/nostr-client/correlation-store.ts +++ b/src/transport/nostr-client/correlation-store.ts @@ -1,4 +1,4 @@ -import type { JSONRPCResponse, JSONRPCRequest } from '@contextvm/mcp-sdk/types.js'; +import type { JSONRPCResponse } from '@contextvm/mcp-sdk/types.js'; import { LruCache } from '../../core/utils/lru-cache.js'; /** @@ -15,8 +15,6 @@ export interface PendingRequest { progressToken?: string; /** Minimal context about the original request (safe to store; no arguments). */ originalRequestContext?: OriginalRequestContext; - /** The full raw original JSON-RPC request for explicit gating retries. */ - rawRequest?: JSONRPCRequest; } /** @@ -76,12 +74,6 @@ export class ClientCorrelationStore { return this.pendingRequests.get(eventId); } - /** - * Gets the raw original JSON-RPC request for explicit gating retries. - */ - getRawRequest(eventId: string): JSONRPCRequest | undefined { - return this.pendingRequests.get(eventId)?.rawRequest; - } /** * Resolves a response by finding and removing the corresponding request. diff --git a/src/transport/nostr-client/inbound-coordinator.ts b/src/transport/nostr-client/inbound-coordinator.ts index a74f6dd..1e3f0d4 100644 --- a/src/transport/nostr-client/inbound-coordinator.ts +++ b/src/transport/nostr-client/inbound-coordinator.ts @@ -11,6 +11,7 @@ import { } from '@contextvm/mcp-sdk/types.js'; import { type NostrEvent } from 'nostr-tools'; import { type Logger } from '../../core/utils/logger.js'; +import { NOSTR_TAGS } from '../../core/constants.js'; import { getNostrEventTag } from '../../core/utils/serializers.js'; import { type ClientCapabilityNegotiator, @@ -201,7 +202,7 @@ export class ClientInboundCoordinator { ); const paymentInteractionTag = event.tags.find( - (tag) => tag[0] === 'payment_interaction' && typeof tag[1] === 'string', + (tag) => tag[0] === NOSTR_TAGS.PAYMENT_INTERACTION && typeof tag[1] === 'string', ); if (paymentInteractionTag) { const mode = paymentInteractionTag[1]; diff --git a/src/transport/nostr-client/outbound-sender.test.ts b/src/transport/nostr-client/outbound-sender.test.ts index 3f6efd7..0212933 100644 --- a/src/transport/nostr-client/outbound-sender.test.ts +++ b/src/transport/nostr-client/outbound-sender.test.ts @@ -18,12 +18,12 @@ const testLogger: Logger = { function createCapabilityNegotiator(): Pick< ClientCapabilityNegotiator, - 'buildOutboundTags' | 'chooseOutboundGiftWrapKind' | 'markDiscoveryTagsSent' + 'buildOutboundTags' | 'chooseOutboundGiftWrapKind' | 'markNegotiationTagsSent' > { return { buildOutboundTags: ({ baseTags }) => baseTags as string[][], chooseOutboundGiftWrapKind: () => 0, - markDiscoveryTagsSent: () => undefined, + markNegotiationTagsSent: () => undefined, }; } diff --git a/src/transport/nostr-client/outbound-sender.ts b/src/transport/nostr-client/outbound-sender.ts index 984f199..a55bee6 100644 --- a/src/transport/nostr-client/outbound-sender.ts +++ b/src/transport/nostr-client/outbound-sender.ts @@ -1,7 +1,6 @@ import { type JSONRPCMessage, isJSONRPCRequest, - type JSONRPCRequest, } from '@contextvm/mcp-sdk/types.js'; import { CTXVM_MESSAGES_KIND, INITIALIZE_METHOD } from '../../core/index.js'; import { type Logger } from '../../core/utils/logger.js'; @@ -115,9 +114,7 @@ export class ClientOutboundSender { String(progressToken), giftWrapKind, ); - // Note: Oversized transfers skip markDiscoveryTagsSent() on this early return path. - // This is low risk in practice because oversized transfers only trigger for large payloads, - // and discovery negotiation usually happens early with small messages (like `initialize`). + return 'oversized-transfer'; } } @@ -150,14 +147,14 @@ export class ClientOutboundSender { progressToken: progressToken !== undefined ? String(progressToken) : undefined, originalRequestContext, - rawRequest: isRequest ? (message as JSONRPCRequest) : undefined, + }); }, giftWrapKind, ); if (isRequest) { - this.deps.capabilityNegotiator.markDiscoveryTagsSent(); + this.deps.capabilityNegotiator.markNegotiationTagsSent(); } return eventId; @@ -218,10 +215,10 @@ export class ClientOutboundSender { progressToken, originalRequestContext: this.deps.getOriginalRequestContext(originalMessage), - rawRequest: originalMessage as JSONRPCRequest, + }); } - this.deps.capabilityNegotiator.markDiscoveryTagsSent(); + this.deps.capabilityNegotiator.markNegotiationTagsSent(); } } diff --git a/src/transport/nostr-server/inbound-coordinator.ts b/src/transport/nostr-server/inbound-coordinator.ts index 643945c..e28c28d 100644 --- a/src/transport/nostr-server/inbound-coordinator.ts +++ b/src/transport/nostr-server/inbound-coordinator.ts @@ -8,6 +8,7 @@ import { import { type NostrEvent } from 'nostr-tools'; import { type Logger } from '../../core/utils/logger.js'; import { type SessionStore, type ClientSession } from './session-store.js'; +import { NOSTR_TAGS } from '../../core/constants.js'; import { type CorrelationStore } from './correlation-store.js'; import { type AuthorizationPolicy } from './authorization-policy.js'; import { type ServerOpenStreamFactory } from './open-stream-factory.js'; @@ -178,7 +179,7 @@ export class ServerInboundCoordinator { this.deps.supportedPaymentInteraction === 'explicit_gating'; const paymentInteractionTag = event.tags.find( - (tag) => tag[0] === 'payment_interaction' && typeof tag[1] === 'string', + (tag) => tag[0] === NOSTR_TAGS.PAYMENT_INTERACTION && typeof tag[1] === 'string', ); if (paymentInteractionTag && !session.requestedPaymentInteraction) { diff --git a/src/transport/nostr-server/outbound-response-router.ts b/src/transport/nostr-server/outbound-response-router.ts index 00c06d7..b36d7cc 100644 --- a/src/transport/nostr-server/outbound-response-router.ts +++ b/src/transport/nostr-server/outbound-response-router.ts @@ -13,6 +13,7 @@ import { import { type Logger } from '../../core/utils/logger.js'; import { type CorrelationStore } from './correlation-store.js'; import { type ClientSession, type SessionStore } from './session-store.js'; +import { NOSTR_TAGS } from '../../core/constants.js'; import { type AnnouncementManager } from './announcement-manager.js'; import { CTXVM_MESSAGES_KIND } from '../../core/constants.js'; @@ -327,7 +328,7 @@ export class OutboundResponseRouter { !session.hasDisclosedPaymentInteraction && session.effectivePaymentInteraction ) { - tags.push(['payment_interaction', session.effectivePaymentInteraction]); + tags.push([NOSTR_TAGS.PAYMENT_INTERACTION, session.effectivePaymentInteraction]); session.hasDisclosedPaymentInteraction = true; } } From 27b9d3495fdec92102b537debfb29148de1e94aa Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Fri, 19 Jun 2026 23:12:29 +0530 Subject: [PATCH 13/19] chore: add regression test for getNegotiationTags and fix imports --- src/transport/capability-negotiator.test.ts | 52 +++++++++++++++++++ .../nostr-server/outbound-response-router.ts | 4 +- 2 files changed, 53 insertions(+), 3 deletions(-) create mode 100644 src/transport/capability-negotiator.test.ts diff --git a/src/transport/capability-negotiator.test.ts b/src/transport/capability-negotiator.test.ts new file mode 100644 index 0000000..ae34f8e --- /dev/null +++ b/src/transport/capability-negotiator.test.ts @@ -0,0 +1,52 @@ +import { describe, expect, test } from 'bun:test'; +import { ClientCapabilityNegotiator } from './capability-negotiator.js'; + +import { EncryptionMode, GiftWrapMode } from '../core/interfaces.js'; + +describe('ClientCapabilityNegotiator', () => { + test('should not consume payment_interaction tag during measurement calls', () => { + const negotiator = new ClientCapabilityNegotiator({ + encryptionMode: EncryptionMode.OPTIONAL, + giftWrapMode: GiftWrapMode.EPHEMERAL, + oversizedEnabled: false, + openStreamEnabled: false, + composeOutboundTags: ({ baseTags, discoveryTags, negotiationTags }) => [ + ...baseTags, + ...discoveryTags, + ...negotiationTags, + ], + }); + + negotiator.setPaymentInteraction('explicit_gating'); + + // Simulate measurement call (tags discarded) + const measurementTags = negotiator.buildOutboundTags({ + baseTags: [['p', 'server-pubkey']], + includeDiscovery: true, + }); + expect( + measurementTags.some(t => t[0] === 'payment_interaction' && t[1] === 'explicit_gating') + ).toBe(true); + + // Simulate real send (tags actually used) + const realTags = negotiator.buildOutboundTags({ + baseTags: [['p', 'server-pubkey']], + includeDiscovery: true, + }); + expect( + realTags.some(t => t[0] === 'payment_interaction' && t[1] === 'explicit_gating') + ).toBe(true); + + // Mark as sent (post-send) + negotiator.markNegotiationTagsSent(); + + // Should no longer appear + const afterTags = negotiator.buildOutboundTags({ + baseTags: [['p', 'server-pubkey']], + includeDiscovery: true, + }); + expect( + afterTags.some(t => t[0] === 'payment_interaction') + ).toBe(false); + }); +}); diff --git a/src/transport/nostr-server/outbound-response-router.ts b/src/transport/nostr-server/outbound-response-router.ts index b36d7cc..6a188e1 100644 --- a/src/transport/nostr-server/outbound-response-router.ts +++ b/src/transport/nostr-server/outbound-response-router.ts @@ -13,10 +13,8 @@ import { import { type Logger } from '../../core/utils/logger.js'; import { type CorrelationStore } from './correlation-store.js'; import { type ClientSession, type SessionStore } from './session-store.js'; -import { NOSTR_TAGS } from '../../core/constants.js'; import { type AnnouncementManager } from './announcement-manager.js'; - -import { CTXVM_MESSAGES_KIND } from '../../core/constants.js'; +import { NOSTR_TAGS, CTXVM_MESSAGES_KIND } from '../../core/constants.js'; import { sendOversizedServerResponse } from './oversized-server-handler.js'; /** From c106bbf56ac783963283fdeafd8ba8ff6d8bb05b Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Fri, 19 Jun 2026 23:18:51 +0530 Subject: [PATCH 14/19] fix: replace remaining @modelcontextprotocol SDK imports with @contextvm/mcp-sdk --- src/payments/server-explicit-gating.ts | 2 +- src/payments/server-payments-utils.ts | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/src/payments/server-explicit-gating.ts b/src/payments/server-explicit-gating.ts index b955f5e..cc96346 100644 --- a/src/payments/server-explicit-gating.ts +++ b/src/payments/server-explicit-gating.ts @@ -1,4 +1,4 @@ -import type { JSONRPCErrorResponse } from '@modelcontextprotocol/sdk/types.js'; +import type { JSONRPCErrorResponse } from '@contextvm/mcp-sdk/types.js'; import type { ServerMiddlewareFn } from './types.js'; import { isJsonRpcRequest } from './types.js'; import type { ServerPaymentsOptions } from './server-payments.js'; diff --git a/src/payments/server-payments-utils.ts b/src/payments/server-payments-utils.ts index 8644d08..6f4136a 100644 --- a/src/payments/server-payments-utils.ts +++ b/src/payments/server-payments-utils.ts @@ -1,4 +1,4 @@ -import type { JSONRPCRequest } from '@modelcontextprotocol/sdk/types.js'; +import type { JSONRPCRequest } from '@contextvm/mcp-sdk/types.js'; import type { PricedCapability, ResolvePriceRejection, From 39eae38b7a69b2dac9639fc6df04352e716322e8 Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Fri, 19 Jun 2026 23:28:38 +0530 Subject: [PATCH 15/19] refactor: un-export internal helpers to clean up API surface --- src/payments/authorization-store.ts | 2 +- src/payments/server-payments-utils.ts | 10 +++++----- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/src/payments/authorization-store.ts b/src/payments/authorization-store.ts index 1dfc351..32df7ef 100644 --- a/src/payments/authorization-store.ts +++ b/src/payments/authorization-store.ts @@ -2,7 +2,7 @@ import type { CanonicalInvocationIdentity } from './types.js'; import { LruCache } from '../core/utils/lru-cache.js'; import { createLogger } from '../core/utils/logger.js'; -export interface PaidAuthorization { +interface PaidAuthorization { /** Composite key: `${clientPubkey}:${invocationHash}` */ key: string; expiresAtMs: number; diff --git a/src/payments/server-payments-utils.ts b/src/payments/server-payments-utils.ts index 6f4136a..5dba9e9 100644 --- a/src/payments/server-payments-utils.ts +++ b/src/payments/server-payments-utils.ts @@ -8,7 +8,7 @@ import type { PaymentRequired, } from './types.js'; -export function getVerificationTimeoutMs(params: { +function getVerificationTimeoutMs(params: { ttlSeconds: number | undefined; }): number { // CEP-8 TTL is in seconds. If TTL is absent, default is 5 minutes. @@ -36,7 +36,7 @@ export function matchPricedCapability( }); } -export function getCapabilityNameForPricing( +function getCapabilityNameForPricing( message: JSONRPCRequest, ): string | undefined { const params = message.params as Record | undefined; @@ -56,19 +56,19 @@ export function getCapabilityNameForPricing( } } -export function isResolvePriceRejection( +function isResolvePriceRejection( quote: ResolvePriceResult, ): quote is ResolvePriceRejection { return 'reject' in quote && quote.reject; } -export function isResolvePriceWaiver( +function isResolvePriceWaiver( quote: ResolvePriceResult, ): quote is ResolvePriceWaiver { return 'waive' in quote && quote.waive; } -export function resolvePaymentProcessor( +function resolvePaymentProcessor( clientPmis: readonly string[] | undefined, processorsByPmi: Map, processors: readonly PaymentProcessor[], From 35f8774473a2351cebf6970508cf92e434b7562e Mon Sep 17 00:00:00 2001 From: ContextVM Date: Sat, 20 Jun 2026 15:30:52 +0200 Subject: [PATCH 16/19] fix(payments): finalize CEP-8 explicit-gating compliance and test coverage Spec compliance: - -32602 (unsupported payment_interaction) now carries data: { requested, supported } - -32042/-32043 instructions emphasize retrying with the same method and params - Client effective-mode guard: declines transparent payment_required when the server did not accept explicit_gating for the session Behavior-preserving refactor: - AuthorizationStore simplified to single-use grants (dropped count/remaining/ hasPending); surface confirmed internal-only - Extracted shared buildProcessorsByPmi so the duplicate-PMI warning fires once and the registry is built once across both server middlewares - Split maybeHandlePaymentRequired into explicit-gating + transparent handlers behind a slim classifier - Extracted synthesizePaymentError / dispatchAndForward; consolidated all client-side decline-error synthesis through the single helper Tests (+12 pass): - Explicit-gating e2e: server disclosure, -32043 pending race, user-decline, handler-error, verify-fail-fresh-invoice, -32602 negotiation - Transparent e2e: resolvePrice rejection -> -32000 - Unit: middleware lifecycle, verify-failure fresh -32042, onPaymentRequired reject contract, -32043 retry exhaustion 429 -> 441 pass / 0 fail / 5 skip; tsc clean. docs/: cep-8-update.md (spec reference), pr-improvements.md (review + decisions) --- src/payments/authorization-store.test.ts | 41 +- src/payments/authorization-store.ts | 70 +- src/payments/canonical-identity.test.ts | 4 +- src/payments/client-payments.test.ts | 256 ++++++++ src/payments/client-payments.ts | 254 +++++--- src/payments/server-explicit-gating.test.ts | 186 ++++++ src/payments/server-explicit-gating.ts | 29 +- src/payments/server-payments-utils.ts | 18 + src/payments/server-payments.ts | 94 ++- src/payments/server-transport-payments.ts | 15 +- src/transport/capability-negotiator.test.ts | 14 +- .../nostr-client/correlation-store.ts | 1 - .../nostr-client/inbound-coordinator.ts | 3 +- src/transport/nostr-client/outbound-sender.ts | 2 - src/transport/nostr-server-transport.test.ts | 12 +- .../nostr-server/inbound-coordinator.ts | 9 +- .../nostr-server/outbound-response-router.ts | 5 +- src/transport/payments-flow.test.ts | 601 ++++++++++++++++++ 18 files changed, 1338 insertions(+), 276 deletions(-) diff --git a/src/payments/authorization-store.test.ts b/src/payments/authorization-store.test.ts index 630dd3d..800b84d 100644 --- a/src/payments/authorization-store.test.ts +++ b/src/payments/authorization-store.test.ts @@ -19,16 +19,6 @@ describe('AuthorizationStore', () => { expect(store.claim(identity)).toBe(false); }); - test('grant multiple executions', () => { - const store = new AuthorizationStore(); - - store.grant(identity, 10000, 2); - - expect(store.claim(identity)).toBe(true); - expect(store.claim(identity)).toBe(true); - expect(store.claim(identity)).toBe(false); - }); - test('claim fails after TTL expires', async () => { const store = new AuthorizationStore(); @@ -48,8 +38,8 @@ describe('AuthorizationStore', () => { // Second call is blocked -> false expect(store.trySetPending(identity, 10000)).toBe(false); - // hasPending should reflect the state - expect(store.hasPending(identity)).toBe(true); + // Pending state is observable via getPendingRemainingMs + expect(store.getPendingRemainingMs(identity)).toBeGreaterThan(0); }); test('trySetPending allows setting again after clearPending', () => { @@ -77,13 +67,10 @@ describe('AuthorizationStore', () => { test('grant clears pending state', () => { const store = new AuthorizationStore(); - store.trySetPending(identity, 10000); - expect(store.hasPending(identity)).toBe(true); - + expect(store.trySetPending(identity, 10000)).toBe(true); store.grant(identity, 10000); - - expect(store.hasPending(identity)).toBe(false); - expect(store.claim(identity)).toBe(true); + // grant cleared pending, so a fresh trySetPending succeeds again + expect(store.trySetPending(identity, 10000)).toBe(true); }); test('LRU eviction works when maxEntries is exceeded', () => { @@ -113,9 +100,9 @@ describe('AuthorizationStore', () => { store.trySetPending(id2, 10000); store.trySetPending(id3, 10000); // This should evict id1 - expect(store.hasPending(id1)).toBe(false); - expect(store.hasPending(id2)).toBe(true); - expect(store.hasPending(id3)).toBe(true); + expect(store.getPendingRemainingMs(id1)).toBe(0); + expect(store.getPendingRemainingMs(id2)).toBeGreaterThan(0); + expect(store.getPendingRemainingMs(id3)).toBeGreaterThan(0); }); test('updatePendingTtl and getPendingRemainingMs behave correctly', async () => { @@ -147,16 +134,4 @@ describe('AuthorizationStore', () => { store.updatePendingTtl(identity, 1000); expect(store.getPendingRemainingMs(identity)).toBe(0); }); - - test('grant throws RangeError when count is 0 or negative', () => { - const store = new AuthorizationStore(); - - expect(() => { - store.grant(identity, 1000, 0); - }).toThrow(RangeError); - - expect(() => { - store.grant(identity, 1000, -1); - }).toThrow(RangeError); - }); }); diff --git a/src/payments/authorization-store.ts b/src/payments/authorization-store.ts index 32df7ef..28c1939 100644 --- a/src/payments/authorization-store.ts +++ b/src/payments/authorization-store.ts @@ -6,8 +6,6 @@ interface PaidAuthorization { /** Composite key: `${clientPubkey}:${invocationHash}` */ key: string; expiresAtMs: number; - /** Number of remaining executions (usually 1). */ - remaining: number; } /** @@ -36,39 +34,25 @@ export class AuthorizationStore { } /** - * Records a paid authorization. + * Records a paid authorization. Each grant authorizes exactly one future + * execution (CEP-8: "each successful payment SHOULD authorize one future + * execution unless server policy explicitly grants a different number"). */ - public grant( - identity: CanonicalInvocationIdentity, - ttlMs: number, - count: number = 1, - ): void { - if (count <= 0) { - throw new RangeError('Authorization count must be greater than 0'); - } - + public grant(identity: CanonicalInvocationIdentity, ttlMs: number): void { const key = this.getKey(identity); const expiresAtMs = Date.now() + ttlMs; - this.authorizations.set(key, { - key, - expiresAtMs, - remaining: count, - }); + this.authorizations.set(key, { key, expiresAtMs }); // Once granted, it's no longer pending this.pending.delete(key); - this.logger.debug('authorization granted', { - key, - ttlMs, - count, - }); + this.logger.debug('authorization granted', { key, ttlMs }); } /** - * Atomically claims one execution authorization. - * Returns true if claimed, false if none available. + * Atomically claims the single execution authorization. + * Returns true if claimed, false if none available or expired. */ public claim(identity: CanonicalInvocationIdentity): boolean { const key = this.getKey(identity); @@ -83,23 +67,10 @@ export class AuthorizationStore { return false; } - if (auth.remaining > 0) { - auth.remaining -= 1; - if (auth.remaining === 0) { - this.authorizations.delete(key); - } else { - // Explicitly delete and set to guarantee LRU position is refreshed - this.authorizations.delete(key); - this.authorizations.set(key, auth); - } - this.logger.debug('authorization claimed', { - key, - remaining: auth.remaining, - }); - return true; - } - - return false; + // Single-use: consume the authorization atomically. + this.authorizations.delete(key); + this.logger.debug('authorization claimed', { key }); + return true; } /** @@ -135,23 +106,6 @@ export class AuthorizationStore { return true; } - /** Checks if a payment is pending (not yet authorized). */ - public hasPending(identity: CanonicalInvocationIdentity): boolean { - const key = this.getKey(identity); - const expiry = this.pending.get(key); - - if (expiry === undefined) { - return false; - } - - if (Date.now() > expiry) { - this.pending.delete(key); - return false; - } - - return true; - } - /** * Updates the TTL of an already pending authorization. No-op if not pending. * diff --git a/src/payments/canonical-identity.test.ts b/src/payments/canonical-identity.test.ts index c9286b8..dca0de5 100644 --- a/src/payments/canonical-identity.test.ts +++ b/src/payments/canonical-identity.test.ts @@ -92,7 +92,9 @@ describe('Canonical Invocation Identity', () => { "Failed to canonicalize invocation payload for method 'tools/call'. Ensure params contain only JSON-serializable values (no circular references, functions, symbols, or BigInt).", ); expect(() => - computeCanonicalInvocationHash('tools/call', { big: BigInt('9007199254740991') }), + computeCanonicalInvocationHash('tools/call', { + big: BigInt('9007199254740991'), + }), ).toThrow( "Failed to canonicalize invocation payload for method 'tools/call'. Ensure params contain only JSON-serializable values (no circular references, functions, symbols, or BigInt).", ); diff --git a/src/payments/client-payments.test.ts b/src/payments/client-payments.test.ts index 4e4b912..15a3d48 100644 --- a/src/payments/client-payments.test.ts +++ b/src/payments/client-payments.test.ts @@ -344,6 +344,129 @@ describe('withClientPayments()', () => { }); }); + test('declines transparent payment_required when client requested explicit_gating but server did not accept it', async () => { + const transport = createMockNostrTransport(); + + const observed: JSONRPCMessage[] = []; + let handleCalls = 0; + const paid = withClientPayments(transport, { + handlers: [ + { + pmi: 'fake', + async handle(): Promise { + handleCalls += 1; + }, + }, + ], + paymentInteraction: 'explicit_gating', + }); + + paid.onmessage = (msg) => observed.push(msg); + await paid.start(); + + // Server never disclosed explicit_gating, so getEffectivePaymentInteraction() is undefined. + ( + transport as unknown as { + correlationStore: { + registerRequest: (eventId: string, req: unknown) => void; + }; + } + ).correlationStore.registerRequest('req-event-id', { + originalRequestId: 7, + isInitialize: false, + progressToken: undefined, + originalRequestContext: { method: 'tools/call', capability: 'tool:paid' }, + }); + + (transport as unknown as TransportWithContext).onmessageWithContext?.( + { + jsonrpc: '2.0', + method: 'notifications/payment_required', + params: { amount: 1, pay_req: 'z', pmi: 'fake' }, + } as JSONRPCMessage, + { eventId: 'evt', correlatedEventId: 'req-event-id' }, + ); + + await new Promise((r) => setTimeout(r, 0)); + + // CEP-8 effective-mode guard: handler MUST NOT be invoked. + expect(handleCalls).toBe(0); + const errResp = observed.find( + ( + m, + ): m is { + jsonrpc: '2.0'; + id: number; + error: { code: number; message: string; data?: unknown }; + } => 'id' in m && m.id === 7 && 'error' in m, + ); + expect(errResp?.error?.code).toBe(-32000); + expect(errResp?.error?.message).toBe( + 'Payment declined: explicit_gating was not accepted by the server', + ); + expect(errResp?.error?.data).toEqual({ + pmi: 'fake', + amount: 1, + method: 'tools/call', + capability: 'tool:paid', + }); + }); + + test('proceeds with transparent payment when server accepted explicit_gating for the session', async () => { + const transport = createMockNostrTransport(); + + let observed: PaymentHandlerRequest | undefined; + const paid = withClientPayments(transport, { + handlers: [ + { + pmi: 'fake', + async handle(req): Promise { + observed = req; + }, + }, + ], + paymentInteraction: 'explicit_gating', + }); + + await paid.start(); + + // Server disclosed explicit_gating as the effective mode for the session. + ( + transport as unknown as { + metadataStore: { + setEffectivePaymentInteraction: (mode: string) => void; + }; + } + ).metadataStore.setEffectivePaymentInteraction('explicit_gating'); + ( + transport as unknown as { + correlationStore: { + registerRequest: (eventId: string, req: unknown) => void; + }; + } + ).correlationStore.registerRequest('req-event-id', { + originalRequestId: 8, + isInitialize: false, + progressToken: undefined, + originalRequestContext: undefined, + }); + + (transport as unknown as TransportWithContext).onmessageWithContext?.( + { + jsonrpc: '2.0', + method: 'notifications/payment_required', + params: { amount: 1, pay_req: 'w', pmi: 'fake' }, + } as JSONRPCMessage, + { eventId: 'evt', correlatedEventId: 'req-event-id' }, + ); + + await new Promise((r) => setTimeout(r, 0)); + + // Guard does not fire: handler IS invoked. + expect(observed).toBeDefined(); + expect(observed?.pmi).toBe('fake'); + }); + test('drops uncorrelated payment_required notifications on Nostr transports', async () => { const transport = createMockNostrTransport(); @@ -795,4 +918,137 @@ describe('withClientPayments()', () => { await paid.close(); }); + + test('synthesizes -32042 with type payment_handler_error when onPaymentRequired rejects', async () => { + const transport = createMockNostrTransport(); + + transport + .getInternalStateForTesting() + .correlationStore.registerRequest('req-event-id-reject', { + originalRequestId: 55, + isInitialize: false, + originalRequestContext: { method: 'tools/call' }, + }); + + const observed: JSONRPCMessage[] = []; + const paid = withClientPayments(transport, { + handlers: [{ pmi: 'fake', async handle(): Promise {} }], + paymentInteraction: 'explicit_gating', + onPaymentRequired: async () => { + throw new Error('wallet offline'); + }, + }); + paid.onmessage = (msg) => observed.push(msg); + await paid.start(); + + await paid.send({ + jsonrpc: '2.0', + id: 55, + method: 'tools/call', + params: { name: 'test' }, + }); + + (transport as unknown as TransportWithContext).onmessageWithContext?.( + { + jsonrpc: '2.0', + id: 55, + error: { + code: -32042, + message: 'Payment Required', + data: { + payment_options: [ + { amount: 10, pmi: 'fake', pay_req: 'pr-reject' }, + ], + }, + }, + }, + { eventId: 'evt', correlatedEventId: 'req-event-id-reject' }, + ); + + await new Promise((r) => setTimeout(r, 0)); + + expect(observed).toHaveLength(1); + const errResp = observed[0] as { + id?: unknown; + error?: { + code?: number; + data?: { reason?: string; type?: string }; + }; + }; + expect(errResp.id).toBe(55); + expect(errResp.error?.code).toBe(-32042); + expect(errResp.error?.data?.reason).toBe('wallet offline'); + expect(errResp.error?.data?.type).toBe('payment_handler_error'); + + await paid.close(); + }); + + test('forwards -32043 to caller after maxPendingRetries is exceeded', async () => { + const transport = createMockNostrTransport(); + transport.send = async (): Promise => { + // no-op: retries do not produce a server response in this unit test + }; + + transport + .getInternalStateForTesting() + .correlationStore.registerRequest('req-event-id-exhaust', { + originalRequestId: 66, + isInitialize: false, + originalRequestContext: { method: 'tools/call' }, + }); + + const observed: JSONRPCMessage[] = []; + const paid = withClientPayments(transport, { + handlers: [{ pmi: 'fake', async handle(): Promise {} }], + paymentInteraction: 'explicit_gating', + maxPendingRetries: 2, + }); + paid.onmessage = (msg) => observed.push(msg); + await paid.start(); + + await paid.send({ + jsonrpc: '2.0', + id: 66, + method: 'tools/call', + params: { name: 'test' }, + }); + + const deliverPending = (): void => { + (transport as unknown as TransportWithContext).onmessageWithContext?.( + { + jsonrpc: '2.0', + id: 66, + error: { + code: -32043, + message: 'Payment Pending', + data: { retry_after: 0.01 }, + }, + }, + { eventId: 'evt', correlatedEventId: 'req-event-id-exhaust' }, + ); + }; + + // First two: intercepted and retried (not observed by caller). + deliverPending(); + await new Promise((r) => setTimeout(r, 20)); + expect(observed).toHaveLength(0); + + deliverPending(); + await new Promise((r) => setTimeout(r, 25)); + expect(observed).toHaveLength(0); + + // Third: retry budget exhausted → -32043 reaches the caller. + deliverPending(); + await new Promise((r) => setTimeout(r, 0)); + + expect(observed).toHaveLength(1); + const errResp = observed[0] as { + id?: unknown; + error?: { code?: number }; + }; + expect(errResp.id).toBe(66); + expect(errResp.error?.code).toBe(-32043); + + await paid.close(); + }); }); diff --git a/src/payments/client-payments.ts b/src/payments/client-payments.ts index 34db4a9..6374db3 100644 --- a/src/payments/client-payments.ts +++ b/src/payments/client-payments.ts @@ -98,6 +98,11 @@ export interface ClientPaymentsOptions { * `data: { reason: error.message, type: 'payment_handler_error' }`. * - Transient payment-provider failures should reject with an Error whose * `message` contains the provider error details. + * + * **Verify-timeout window**: if the server's verification times out or fails + * after the client paid, its pending state is cleared and the client's retry + * receives a fresh `-32042` with a new invoice (CEP-8-compliant). The wrapper + * does not dedup across distinct `pay_req` values. */ onPaymentRequired?: (params: { options: PaymentOption[]; @@ -244,7 +249,11 @@ export function withClientPayments( const rawRequestCache = new LruCache(1000); const MAX_RETRIES = options.maxPendingRetries ?? 10; - const stopAllSyntheticProgress = (): void => { + /** + * Disposes all client-side payment state: synthetic progress, pending retry + * timers, retry counters, and the raw-request cache. Called on transport close. + */ + const disposeClientState = (): void => { syntheticProgress.clear(); if (syntheticProgressScheduler) { clearInterval(syntheticProgressScheduler); @@ -295,12 +304,34 @@ export function withClientPayments( let onerror: ((error: Error) => void) | undefined; let onclose: (() => void) | undefined; - async function maybeHandlePaymentRequired( + /** Emits a synthesized JSON-RPC error to the upstream consumer via `onmessage`. */ + const synthesizePaymentError = (params: { + id: string | number | undefined; + code: number; + message: string; + data: Record; + }): void => { + onmessage?.({ + jsonrpc: '2.0', + id: params.id, + error: { + code: params.code, + message: params.message, + data: params.data, + }, + } as JSONRPCMessage); + }; + + /** + * Handles explicit-gating -32042 (invoke `onPaymentRequired`, then retry) and + * -32043 (backoff, then retry). Both are intercepted here, never forwarded. + */ + async function handleExplicitPaymentError( message: JSONRPCMessage, requestEventId: string, ): Promise { if (isExplicitPaymentRequiredError(message)) { - const errorMsg = message as JSONRPCErrorResponse; + const errorMsg = message; const data = errorMsg.error.data as PaymentRequiredErrorData; if (!options.onPaymentRequired) { @@ -339,47 +370,39 @@ export function withClientPayments( }); await transport.send(rawRequest); return; - } else { - logger.debug('onPaymentRequired returned paid=false', { - requestEventId, - reason: result.reason, - }); - const newErrorMsg: JSONRPCMessage = { - jsonrpc: '2.0', - id: errorMsg.id, - error: { - code: PAYMENT_REQUIRED_ERROR_CODE, - message: 'Payment Required', - data: { reason: result.reason || 'user_cancelled' }, - }, - }; - onmessage?.(newErrorMsg); - return; } + + logger.debug('onPaymentRequired returned paid=false', { + requestEventId, + reason: result.reason, + }); + synthesizePaymentError({ + id: errorMsg.id, + code: PAYMENT_REQUIRED_ERROR_CODE, + message: 'Payment Required', + data: { reason: result.reason || 'user_cancelled' }, + }); } catch (err) { logger.error('onPaymentRequired callback failed', { requestEventId, error: err instanceof Error ? err.message : String(err), }); - const newErrorMsg: JSONRPCMessage = { - jsonrpc: '2.0', + synthesizePaymentError({ id: errorMsg.id, - error: { - code: PAYMENT_REQUIRED_ERROR_CODE, - message: 'Payment Required', - data: { - reason: err instanceof Error ? err.message : String(err), - type: 'payment_handler_error', - }, + code: PAYMENT_REQUIRED_ERROR_CODE, + message: 'Payment Required', + data: { + reason: err instanceof Error ? err.message : String(err), + type: 'payment_handler_error', }, - }; - onmessage?.(newErrorMsg); - return; + }); } + return; } + // -32043 Payment Pending if (isExplicitPaymentPendingError(message)) { - const errorMsg = message as JSONRPCErrorResponse; + const errorMsg = message; const data = errorMsg.error.data as PaymentPendingErrorData; const retryAfterSeconds = data.retry_after; @@ -426,30 +449,29 @@ export function withClientPayments( requestEventId, error: err instanceof Error ? err.message : String(err), }); - const errorMsg: JSONRPCErrorResponse = - { - jsonrpc: '2.0', - id: rawRequest.id, - error: { - code: PAYMENT_PENDING_ERROR_CODE, - message: 'Failed to retry pending request', - data: { - reason: err instanceof Error ? err.message : String(err), - }, - }, - }; - onmessage?.(errorMsg); + synthesizePaymentError({ + id: rawRequest.id, + code: PAYMENT_PENDING_ERROR_CODE, + message: 'Failed to retry pending request', + data: { + reason: err instanceof Error ? err.message : String(err), + }, + }); }); }, delayMs); pendingTimers.add(timer); - - return; // Intercept the error so the client waits - } - - if (!isPaymentRequiredNotification(message)) { - return; } + } + /** + * Handles transparent `notifications/payment_required`: satisfies the request + * in-band via configured handlers, gated by `paymentPolicy`, `canHandle`, and + * the effective-mode guard. + */ + async function handleTransparentPaymentRequired( + message: PaymentRequiredNotification, + requestEventId: string, + ): Promise { const handler = handlersByPmi.get(message.params.pmi); if (!handler) { logger.debug('no handler for PMI, ignoring payment_required', { @@ -474,6 +496,34 @@ export function withClientPayments( return; } + // CEP-8: a client that required explicit_gating SHOULD NOT auto-satisfy a + // transparent payment_required when the server did not accept it. + if ( + isNostrTransport && + options.paymentInteraction === 'explicit_gating' && + transport.getEffectivePaymentInteraction() !== 'explicit_gating' + ) { + logger.warn( + 'declining transparent payment_required: explicit_gating was not accepted by the server', + { requestEventId, pmi: message.params.pmi }, + ); + if (pending?.originalRequestId != null) { + synthesizePaymentError({ + id: pending.originalRequestId, + code: -32000, + message: + 'Payment declined: explicit_gating was not accepted by the server', + data: { + pmi: message.params.pmi, + amount: message.params.amount, + method: pending.originalRequestContext?.method, + capability: pending.originalRequestContext?.capability, + }, + }); + } + return; + } + // If the transport can provide the original request's progressToken, emit synthetic // progress notifications locally to keep the upstream MCP request alive while the // payment settles (CEP-8 TTL can exceed the default MCP timeout). @@ -553,20 +603,17 @@ export function withClientPayments( stopSyntheticProgress(pending.progressToken); } - onmessage?.({ - jsonrpc: '2.0', + synthesizePaymentError({ id: pending.originalRequestId, - error: { - code: -32000, - message: params.message, - data: { - pmi: req.pmi, - amount: req.amount, - method: pending.originalRequestContext?.method, - capability: pending.originalRequestContext?.capability, - }, + code: -32000, + message: params.message, + data: { + pmi: req.pmi, + amount: req.amount, + method: pending.originalRequestContext?.method, + capability: pending.originalRequestContext?.capability, }, - } as JSONRPCMessage); + }); }; logger.info('processing payment_required', { @@ -629,6 +676,47 @@ export function withClientPayments( } } + /** Classifies an inbound payment message and delegates to the relevant handler. */ + async function maybeHandlePaymentRequired( + message: JSONRPCMessage, + requestEventId: string, + ): Promise { + if ( + isExplicitPaymentRequiredError(message) || + isExplicitPaymentPendingError(message) + ) { + await handleExplicitPaymentError(message, requestEventId); + return; + } + if (isPaymentRequiredNotification(message)) { + await handleTransparentPaymentRequired(message, requestEventId); + return; + } + } + + /** + * Runs the payment handler, then forwards to the upstream consumer unless the + * message is an explicit-gating error (those are re-emitted/retried internally). + */ + const dispatchAndForward = ( + message: JSONRPCMessage, + requestEventId: string, + ): void => { + void maybeHandlePaymentRequired(message, requestEventId).catch( + (err: unknown) => { + const error = err instanceof Error ? err : new Error(String(err)); + onerror?.(error); + }, + ); + if ( + isExplicitPaymentRequiredError(message) || + isExplicitPaymentPendingError(message) + ) { + return; + } + onmessage?.(message); + }; + const wrapped = { get onmessage() { return onmessage; @@ -686,23 +774,7 @@ export function withClientPayments( } // Best-effort: execute handler asynchronously, but never block delivery. - void maybeHandlePaymentRequired(message, 'unknown').catch( - (err: unknown) => { - const error = err instanceof Error ? err : new Error(String(err)); - onerror?.(error); - }, - ); - - // If it's an explicit gating error, we intercept it here because - // maybeHandlePaymentRequired takes responsibility for re-emitting it if unhandled. - if ( - isExplicitPaymentRequiredError(message) || - isExplicitPaymentPendingError(message) - ) { - return; - } - - onmessage?.(message); + dispatchAndForward(message, 'unknown'); }; if (hasContextPath) { @@ -746,30 +818,14 @@ export function withClientPayments( } } - void maybeHandlePaymentRequired(message, requestEventId).catch( - (err: unknown) => { - const error = err instanceof Error ? err : new Error(String(err)); - onerror?.(error); - }, - ); - - // If it's an explicit gating error, we intercept it here because - // maybeHandlePaymentRequired takes responsibility for re-emitting it if unhandled. - if ( - isExplicitPaymentRequiredError(message) || - isExplicitPaymentPendingError(message) - ) { - return; - } - // Forward exactly once (see duplicate-delivery guard in `transport.onmessage`). - onmessage?.(message); + dispatchAndForward(message, requestEventId); }; } transport.onerror = (err: Error) => onerror?.(err); transport.onclose = () => { - stopAllSyntheticProgress(); + disposeClientState(); onclose?.(); }; await transport.start(); @@ -783,7 +839,7 @@ export function withClientPayments( }, async close(): Promise { - // stopAllSyntheticProgress is called via transport.onclose, no need to call it here + // disposeClientState is called via transport.onclose, no need to call it here await transport.close(); }, }; diff --git a/src/payments/server-explicit-gating.test.ts b/src/payments/server-explicit-gating.test.ts index b786e02..2056375 100644 --- a/src/payments/server-explicit-gating.test.ts +++ b/src/payments/server-explicit-gating.test.ts @@ -236,4 +236,190 @@ describe('Explicit Gating Middleware', () => { expect(sentResponses[0].error.code).toBe(-32000); expect(sentResponses[0].error.message).toBe('Rate limited'); }); + + // Also covers the -32043 window during verify and single-use grant consumption. + test('exercises async verifyPayment → grant → claim → forward on retry', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + + let verifyResolve!: () => void; + const verifyGate = new Promise((resolve) => { + verifyResolve = resolve; + }); + let verifyCount = 0; + const asyncProcessor = { + pmi: 'fake', + async createPaymentRequired(params: { + amount: number; + description?: string; + requestEventId: string; + clientPubkey: string; + }) { + return { + amount: params.amount, + pay_req: 'pay_req', + description: params.description, + pmi: 'fake', + ttl: 300, + }; + }, + async verifyPayment() { + verifyCount += 1; + await verifyGate; + return { _meta: { ok: true } }; + }, + }; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [asyncProcessor], + pricedCapabilities: [...pricedCapabilities], + }, + authorizationStore: store, + sendResponse: async (_pubkey, response) => { + sentResponses.push(response); + }, + }); + + // (1) First request: -32042 emitted, verifyPayment started but unresolved. + let forwarded1 = false; + await mw(message, ctx, async () => { + forwarded1 = true; + }); + expect(forwarded1).toBe(false); + expect(sentResponses).toHaveLength(1); + expect(sentResponses[0].error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); + expect(verifyCount).toBe(1); + + // (2) Retry while verify is still in flight: -32043 (pending), no forward. + let forwarded2 = false; + await mw(message, ctx, async () => { + forwarded2 = true; + }); + expect(forwarded2).toBe(false); + expect(sentResponses).toHaveLength(2); + expect(sentResponses[1].error.code).toBe(PAYMENT_PENDING_ERROR_CODE); + + // (3) Release verifyPayment → middleware grants authorization. + verifyResolve(); + await new Promise((r) => setTimeout(r, 5)); + + // (4) Retry now: claim consumes the grant → forward, no new response. + let forwarded3 = false; + await mw(message, ctx, async () => { + forwarded3 = true; + }); + expect(forwarded3).toBe(true); + expect(sentResponses).toHaveLength(2); + + // (5) Authorization is single-use: next call needs a fresh payment. + let forwarded4 = false; + await mw(message, ctx, async () => { + forwarded4 = true; + }); + expect(forwarded4).toBe(false); + expect(sentResponses).toHaveLength(3); + expect(sentResponses[2].error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); + }); + + test('clears pending and returns fresh -32042 when verifyPayment rejects', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + let createCount = 0; + const rejectingProcessor = { + pmi: 'fake', + async createPaymentRequired(params: { + amount: number; + requestEventId: string; + clientPubkey: string; + }) { + createCount += 1; + return { + amount: params.amount, + pay_req: `pr-${createCount}`, + pmi: 'fake', + ttl: 300, + }; + }, + async verifyPayment() { + throw new Error('settlement failed'); + }, + }; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [rejectingProcessor], + pricedCapabilities: [...pricedCapabilities], + }, + authorizationStore: store, + sendResponse: async (_pubkey, response) => { + sentResponses.push(response); + }, + }); + + await mw(message, ctx, async () => {}); + expect(sentResponses[0].error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); + + // Let the async verifyPayment reject and clear pending state. + await new Promise((r) => setTimeout(r, 5)); + + // Retry: fresh -32042 (not -32043) with a brand-new payment request. + await mw(message, ctx, async () => {}); + expect(sentResponses).toHaveLength(2); + expect(sentResponses[1].error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); + expect(createCount).toBe(2); + }); + + // Timeout-path counterpart to the test above. + test('clears pending and returns fresh -32042 when verifyPayment times out', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + let createCount = 0; + const timeoutProcessor = { + pmi: 'fake', + async createPaymentRequired(params: { + amount: number; + requestEventId: string; + clientPubkey: string; + }) { + createCount += 1; + return { + amount: params.amount, + pay_req: `pr-${createCount}`, + pmi: 'fake', + ttl: 1, + }; + }, + verifyPayment() { + return new Promise<{ _meta?: Record }>(() => { + // never resolves + }); + }, + }; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [timeoutProcessor], + pricedCapabilities: [...pricedCapabilities], + // Cap the polling timeout so the test stays fast. + paymentTtlMs: 200, + }, + authorizationStore: store, + sendResponse: async (_pubkey, response) => { + sentResponses.push(response); + }, + }); + + await mw(message, ctx, async () => {}); + expect(sentResponses[0].error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); + + // Wait for the verify timeout (~200ms) + clearPending. + await new Promise((r) => setTimeout(r, 300)); + + // Retry: fresh -32042 (not -32043). + await mw(message, ctx, async () => {}); + expect(sentResponses).toHaveLength(2); + expect(sentResponses[1].error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); + expect(createCount).toBe(2); + }); }); diff --git a/src/payments/server-explicit-gating.ts b/src/payments/server-explicit-gating.ts index cc96346..5603343 100644 --- a/src/payments/server-explicit-gating.ts +++ b/src/payments/server-explicit-gating.ts @@ -1,10 +1,11 @@ import type { JSONRPCErrorResponse } from '@contextvm/mcp-sdk/types.js'; -import type { ServerMiddlewareFn } from './types.js'; +import type { ServerMiddlewareFn, PaymentProcessor } from './types.js'; import { isJsonRpcRequest } from './types.js'; import type { ServerPaymentsOptions } from './server-payments.js'; import type { AuthorizationStore } from './authorization-store.js'; import { computeCanonicalInvocationIdentity } from './canonical-identity.js'; import { + buildProcessorsByPmi, matchPricedCapability, resolveAndInitiatePayment, } from './server-payments-utils.js'; @@ -23,6 +24,8 @@ export interface ExplicitGatingMiddlewareParams { response: JSONRPCErrorResponse, requestEventId: string, ) => Promise; + /** Pre-built PMI → processor map. Built locally when omitted (standalone use). */ + processorsByPmi?: Map; } export function createExplicitGatingMiddleware( @@ -30,21 +33,8 @@ export function createExplicitGatingMiddleware( ): ServerMiddlewareFn { const { options, authorizationStore, sendResponse } = params; const logger = createLogger('server-explicit-gating'); - - // Warn on duplicate PMI processors — Map construction silently keeps only the last. - const seenProcessorPmis = new Set(); - for (const p of options.processors) { - if (seenProcessorPmis.has(p.pmi)) { - logger.warn('duplicate PMI processor registered, last one wins', { - pmi: p.pmi, - }); - } - seenProcessorPmis.add(p.pmi); - } - - const processorsByPmi = new Map( - options.processors.map((p) => [p.pmi, p] as const), - ); + const processorsByPmi = + params.processorsByPmi ?? buildProcessorsByPmi(options.processors, logger); return async (message, ctx, forward) => { // Only gate requests. @@ -97,7 +87,7 @@ export function createExplicitGatingMiddleware( message: 'Payment Pending', data: { instructions: - 'A payment is already pending for this invocation. Wait and retry.', + 'A payment is already pending for this invocation. Retry the same request later with exactly the same method and params.', // Suggest a short polling interval (e.g. 2 seconds) rather than the full TTL retry_after: Math.min( 2, @@ -162,7 +152,8 @@ export function createExplicitGatingMiddleware( return; } - const { paymentRequired, mergedMeta, processor, verifyTimeoutMs } = initResult; + const { paymentRequired, mergedMeta, processor, verifyTimeoutMs } = + initResult; // Use the strict verification timeout bound for polling const pollingTimeoutMs = Math.min(verifyTimeoutMs, paymentTtlMs); @@ -186,7 +177,7 @@ export function createExplicitGatingMiddleware( message: 'Payment Required', data: { instructions: - 'Payment is required to process this request. Please pay one of the following options and retry the request.', + 'Payment is required to process this request. Pay one of the offered options, then retry the same request with exactly the same method and params.', payment_options: [ { amount: paymentRequired.amount, diff --git a/src/payments/server-payments-utils.ts b/src/payments/server-payments-utils.ts index 5dba9e9..e36be75 100644 --- a/src/payments/server-payments-utils.ts +++ b/src/payments/server-payments-utils.ts @@ -1,4 +1,5 @@ import type { JSONRPCRequest } from '@contextvm/mcp-sdk/types.js'; +import { type Logger } from '../core/utils/logger.js'; import type { PricedCapability, ResolvePriceRejection, @@ -8,6 +9,23 @@ import type { PaymentRequired, } from './types.js'; +/** Builds the PMI → processor map, warning once on duplicate PMIs. */ +export function buildProcessorsByPmi( + processors: readonly PaymentProcessor[], + logger: Logger, +): Map { + const seenProcessorPmis = new Set(); + for (const p of processors) { + if (seenProcessorPmis.has(p.pmi)) { + logger.warn('duplicate PMI processor registered, last one wins', { + pmi: p.pmi, + }); + } + seenProcessorPmis.add(p.pmi); + } + return new Map(processors.map((p) => [p.pmi, p] as const)); +} + function getVerificationTimeoutMs(params: { ttlSeconds: number | undefined; }): number { diff --git a/src/payments/server-payments.ts b/src/payments/server-payments.ts index 8372cba..7cd3c20 100644 --- a/src/payments/server-payments.ts +++ b/src/payments/server-payments.ts @@ -20,6 +20,7 @@ import { PAYMENT_REQUIRED_METHOD, } from './constants.js'; import { + buildProcessorsByPmi, matchPricedCapability, resolveAndInitiatePayment, } from './server-payments-utils.js'; @@ -120,23 +121,13 @@ function createPaymentRejectedNotification(params: { export function createServerPaymentsMiddleware(params: { sender: CorrelatedNotificationSender; options: ServerPaymentsOptions; + /** Pre-built PMI → processor map. Built locally when omitted (standalone use). */ + processorsByPmi?: Map; }): ServerMiddlewareFn { const { sender, options } = params; const logger = createLogger('server-payments'); - const processorsByPmi = new Map( - options.processors.map((p) => [p.pmi, p] as const), - ); - - // Warn on duplicate PMI processors — Map construction silently keeps only the last. - const seenProcessorPmis = new Set(); - for (const p of options.processors) { - if (seenProcessorPmis.has(p.pmi)) { - logger.warn('duplicate PMI processor registered, last one wins', { - pmi: p.pmi, - }); - } - seenProcessorPmis.add(p.pmi); - } + const processorsByPmi = + params.processorsByPmi ?? buildProcessorsByPmi(options.processors, logger); const paymentTtlMs = options.paymentTtlMs ?? DEFAULT_PAYMENT_TTL_MS; const pending = new LruCache( @@ -233,7 +224,8 @@ export function createServerPaymentsMiddleware(params: { return; } - const { paymentRequired, mergedMeta, processor, verifyTimeoutMs } = initResult; + const { paymentRequired, mergedMeta, processor, verifyTimeoutMs } = + initResult; const requiredNotification = createPaymentRequiredNotification({ amount: paymentRequired.amount, @@ -260,48 +252,48 @@ export function createServerPaymentsMiddleware(params: { // Use the strict verification timeout bound for polling const pollingTimeoutMs = Math.min(verifyTimeoutMs, paymentTtlMs); - logger.debug('verifying payment', { - requestEventId, - pmi: paymentRequired.pmi, - timeoutMs: pollingTimeoutMs, - }); + logger.debug('verifying payment', { + requestEventId, + pmi: paymentRequired.pmi, + timeoutMs: pollingTimeoutMs, + }); - const controller = new AbortController(); - const verified = await withTimeout( - processor.verifyPayment({ - pay_req: paymentRequired.pay_req, - requestEventId, - clientPubkey: ctx.clientPubkey, - abortSignal: controller.signal, - }), - pollingTimeoutMs, - 'verifyPayment timed out', - ).finally(() => controller.abort()); - - logger.info('payment accepted', { + const controller = new AbortController(); + const verified = await withTimeout( + processor.verifyPayment({ + pay_req: paymentRequired.pay_req, requestEventId, - pmi: paymentRequired.pmi, - amount: paymentRequired.amount, - }); + clientPubkey: ctx.clientPubkey, + abortSignal: controller.signal, + }), + pollingTimeoutMs, + 'verifyPayment timed out', + ).finally(() => controller.abort()); + + logger.info('payment accepted', { + requestEventId, + pmi: paymentRequired.pmi, + amount: paymentRequired.amount, + }); - const acceptedNotification = createPaymentAcceptedNotification({ - amount: paymentRequired.amount, - pmi: paymentRequired.pmi, - _meta: verified._meta, - }); + const acceptedNotification = createPaymentAcceptedNotification({ + amount: paymentRequired.amount, + pmi: paymentRequired.pmi, + _meta: verified._meta, + }); - await sender.sendNotification( - ctx.clientPubkey, - acceptedNotification, - requestEventId, - ); + await sender.sendNotification( + ctx.clientPubkey, + acceptedNotification, + requestEventId, + ); - logger.debug('forwarding priced request after payment', { - requestEventId, - method: message.method, - }); + logger.debug('forwarding priced request after payment', { + requestEventId, + method: message.method, + }); - await forward(message); + await forward(message); })(); const state: PendingPaymentState = { diff --git a/src/payments/server-transport-payments.ts b/src/payments/server-transport-payments.ts index 4562ce8..d6aace0 100644 --- a/src/payments/server-transport-payments.ts +++ b/src/payments/server-transport-payments.ts @@ -5,6 +5,8 @@ import { createPmiTagsFromProcessors } from './pmi-tags.js'; import { createServerPaymentsMiddleware } from './server-payments.js'; import { createExplicitGatingMiddleware } from './server-explicit-gating.js'; import { AuthorizationStore } from './authorization-store.js'; +import { buildProcessorsByPmi } from './server-payments-utils.js'; +import { createLogger } from '../core/utils/logger.js'; import { NOSTR_TAGS } from '../core/constants.js'; /** @@ -14,6 +16,12 @@ export function withServerPayments( transport: NostrServerTransport, options: ServerPaymentsOptions, ): NostrServerTransport { + // Build the PMI → processor map once and share it across both middlewares. + const processorsByPmi = buildProcessorsByPmi( + options.processors, + createLogger('server-payments'), + ); + // CEP-8 discovery tags: advertise supported PMIs + reference pricing on announcement/list events. const extraTags: string[][] = createPmiTagsFromProcessors(options.processors); @@ -30,7 +38,11 @@ export function withServerPayments( transport.setSupportedPaymentInteraction(options.paymentInteraction); transport.addInboundMiddleware( - createServerPaymentsMiddleware({ sender: transport, options }), + createServerPaymentsMiddleware({ + sender: transport, + options, + processorsByPmi, + }), ); if (options.paymentInteraction === 'explicit_gating') { @@ -46,6 +58,7 @@ export function withServerPayments( requestEventId, ); }, + processorsByPmi, }), ); } diff --git a/src/transport/capability-negotiator.test.ts b/src/transport/capability-negotiator.test.ts index ae34f8e..3acbfb0 100644 --- a/src/transport/capability-negotiator.test.ts +++ b/src/transport/capability-negotiator.test.ts @@ -16,7 +16,7 @@ describe('ClientCapabilityNegotiator', () => { ...negotiationTags, ], }); - + negotiator.setPaymentInteraction('explicit_gating'); // Simulate measurement call (tags discarded) @@ -25,7 +25,9 @@ describe('ClientCapabilityNegotiator', () => { includeDiscovery: true, }); expect( - measurementTags.some(t => t[0] === 'payment_interaction' && t[1] === 'explicit_gating') + measurementTags.some( + (t) => t[0] === 'payment_interaction' && t[1] === 'explicit_gating', + ), ).toBe(true); // Simulate real send (tags actually used) @@ -34,7 +36,9 @@ describe('ClientCapabilityNegotiator', () => { includeDiscovery: true, }); expect( - realTags.some(t => t[0] === 'payment_interaction' && t[1] === 'explicit_gating') + realTags.some( + (t) => t[0] === 'payment_interaction' && t[1] === 'explicit_gating', + ), ).toBe(true); // Mark as sent (post-send) @@ -45,8 +49,6 @@ describe('ClientCapabilityNegotiator', () => { baseTags: [['p', 'server-pubkey']], includeDiscovery: true, }); - expect( - afterTags.some(t => t[0] === 'payment_interaction') - ).toBe(false); + expect(afterTags.some((t) => t[0] === 'payment_interaction')).toBe(false); }); }); diff --git a/src/transport/nostr-client/correlation-store.ts b/src/transport/nostr-client/correlation-store.ts index ce7e809..f422bac 100644 --- a/src/transport/nostr-client/correlation-store.ts +++ b/src/transport/nostr-client/correlation-store.ts @@ -74,7 +74,6 @@ export class ClientCorrelationStore { return this.pendingRequests.get(eventId); } - /** * Resolves a response by finding and removing the corresponding request. * Restores the original request ID in the response before resolving. diff --git a/src/transport/nostr-client/inbound-coordinator.ts b/src/transport/nostr-client/inbound-coordinator.ts index 1e3f0d4..f11a205 100644 --- a/src/transport/nostr-client/inbound-coordinator.ts +++ b/src/transport/nostr-client/inbound-coordinator.ts @@ -202,7 +202,8 @@ export class ClientInboundCoordinator { ); const paymentInteractionTag = event.tags.find( - (tag) => tag[0] === NOSTR_TAGS.PAYMENT_INTERACTION && typeof tag[1] === 'string', + (tag) => + tag[0] === NOSTR_TAGS.PAYMENT_INTERACTION && typeof tag[1] === 'string', ); if (paymentInteractionTag) { const mode = paymentInteractionTag[1]; diff --git a/src/transport/nostr-client/outbound-sender.ts b/src/transport/nostr-client/outbound-sender.ts index a55bee6..50a0814 100644 --- a/src/transport/nostr-client/outbound-sender.ts +++ b/src/transport/nostr-client/outbound-sender.ts @@ -147,7 +147,6 @@ export class ClientOutboundSender { progressToken: progressToken !== undefined ? String(progressToken) : undefined, originalRequestContext, - }); }, giftWrapKind, @@ -215,7 +214,6 @@ export class ClientOutboundSender { progressToken, originalRequestContext: this.deps.getOriginalRequestContext(originalMessage), - }); } diff --git a/src/transport/nostr-server-transport.test.ts b/src/transport/nostr-server-transport.test.ts index 30642fa..7b7e99d 100644 --- a/src/transport/nostr-server-transport.test.ts +++ b/src/transport/nostr-server-transport.test.ts @@ -637,9 +637,17 @@ describe.serial('NostrServerTransport', () => { } expect(connectError).toBeDefined(); - // MCP client wraps JSON-RPC errors. The underlying code should be -32602 + // MCP client wraps JSON-RPC errors into McpError, preserving code/message/data. + // The underlying code should be -32602 expect((connectError as { code: number }).code).toBe(-32602); - expect((connectError as { message: string }).message).toContain('Unsupported payment_interaction mode'); + expect((connectError as { message: string }).message).toContain( + 'Unsupported payment_interaction mode', + ); + // CEP-8: the -32602 MUST disclose the requested mode and the modes the server supports. + expect((connectError as { data: unknown }).data).toEqual({ + requested: 'explicit_gating', + supported: ['transparent'], + }); await server.close(); await clientNostrTransport.close(); diff --git a/src/transport/nostr-server/inbound-coordinator.ts b/src/transport/nostr-server/inbound-coordinator.ts index e28c28d..c451246 100644 --- a/src/transport/nostr-server/inbound-coordinator.ts +++ b/src/transport/nostr-server/inbound-coordinator.ts @@ -179,7 +179,9 @@ export class ServerInboundCoordinator { this.deps.supportedPaymentInteraction === 'explicit_gating'; const paymentInteractionTag = event.tags.find( - (tag) => tag[0] === NOSTR_TAGS.PAYMENT_INTERACTION && typeof tag[1] === 'string', + (tag) => + tag[0] === NOSTR_TAGS.PAYMENT_INTERACTION && + typeof tag[1] === 'string', ); if (paymentInteractionTag && !session.requestedPaymentInteraction) { @@ -198,6 +200,11 @@ export class ServerInboundCoordinator { code: UNSUPPORTED_PAYMENT_INTERACTION_ERROR_CODE, message: 'Unsupported payment_interaction mode: explicit_gating', + // CEP-8 effective-mode disclosure: requested + supported modes. + data: { + requested: mode, + supported: ['transparent'], + }, }, }; const tags = this.deps.createResponseTags(event.pubkey, event.id); diff --git a/src/transport/nostr-server/outbound-response-router.ts b/src/transport/nostr-server/outbound-response-router.ts index 6a188e1..4759867 100644 --- a/src/transport/nostr-server/outbound-response-router.ts +++ b/src/transport/nostr-server/outbound-response-router.ts @@ -326,7 +326,10 @@ export class OutboundResponseRouter { !session.hasDisclosedPaymentInteraction && session.effectivePaymentInteraction ) { - tags.push([NOSTR_TAGS.PAYMENT_INTERACTION, session.effectivePaymentInteraction]); + tags.push([ + NOSTR_TAGS.PAYMENT_INTERACTION, + session.effectivePaymentInteraction, + ]); session.hasDisclosedPaymentInteraction = true; } } diff --git a/src/transport/payments-flow.test.ts b/src/transport/payments-flow.test.ts index 84c6134..67cb5eb 100644 --- a/src/transport/payments-flow.test.ts +++ b/src/transport/payments-flow.test.ts @@ -28,6 +28,7 @@ import { FakePaymentHandler, FakePaymentProcessor, createServerPaymentsMiddleware, + rejectPrice, withClientPayments, withServerPayments, } from '../payments/index.js'; @@ -1104,4 +1105,604 @@ describe.serial('payments fake flow (transport-level)', () => { await client.close(); await mcpServer.close(); }, 20000); + + // CEP-8 MUST: server indicates the effective mode on its first direct response. + test('explicit gating: server discloses payment_interaction=explicit_gating on first direct response', async () => { + const serverSK = generateSecretKey(); + const serverPublicKey = getPublicKey(serverSK); + const serverPrivateKey = bytesToHex(serverSK); + + const mcpServer = new McpServer({ + name: 'disclosure-server', + version: '1.0.0', + }); + mcpServer.registerTool( + 'add', + { + title: 'Addition Tool', + description: 'Add two numbers', + inputSchema: { a: z.number(), b: z.number() }, + }, + async ({ a, b }: { a: number; b: number }) => { + return { content: [{ type: 'text', text: String(a + b) }] }; + }, + ); + + const processor = new FakePaymentProcessor(); + const serverTransport = withServerPayments( + new NostrServerTransport({ + signer: new PrivateKeySigner(serverPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + encryptionMode: EncryptionMode.DISABLED, + }), + { + processors: [processor], + pricedCapabilities: [ + { + method: 'tools/call', + name: 'add', + amount: 1, + currencyUnit: 'test', + }, + ], + paymentInteraction: 'explicit_gating', + }, + ); + await mcpServer.connect(serverTransport); + + // Capture the server's first published CTXVM event carrying a payment_interaction tag. + const capturePromise = captureNextCtxvmEvent({ + relayUrl, + authors: [serverPublicKey], + where: (event) => + event.tags.some( + (t) => t[0] === 'payment_interaction' && typeof t[1] === 'string', + ), + timeoutMs: 5000, + }); + + const clientSK = generateSecretKey(); + const clientPrivateKey = bytesToHex(clientSK); + const clientTransport = new NostrClientTransport({ + signer: new PrivateKeySigner(clientPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + serverPubkey: serverPublicKey, + encryptionMode: EncryptionMode.DISABLED, + }); + const paidClientTransport = withClientPayments(clientTransport, { + handlers: [], + paymentInteraction: 'explicit_gating', + onPaymentRequired: async () => ({ paid: true }), + }); + + const client = new Client({ + name: 'disclosure-client', + version: '1.0.0', + }); + await client.connect(paidClientTransport); // triggers initialize → first response + + const event = await capturePromise; + const piTag = event.tags.find((t) => t[0] === 'payment_interaction') as + | readonly string[] + | undefined; + expect(piTag?.[1]).toBe('explicit_gating'); + + await client.close(); + await mcpServer.close(); + }, 20000); + + // Locks the pending race: pay → slow verify → -32043 → backoff → grant → success. + test('explicit gating: -32043 pending race resolves after verify completes', async () => { + const serverSK = generateSecretKey(); + const serverPublicKey = getPublicKey(serverSK); + const serverPrivateKey = bytesToHex(serverSK); + + const mcpServer = new McpServer({ + name: 'pending-race-server', + version: '1.0.0', + }); + let toolCallCount = 0; + mcpServer.registerTool( + 'add', + { + title: 'Addition Tool', + description: 'Add two numbers', + inputSchema: { a: z.number(), b: z.number() }, + }, + async ({ a, b }: { a: number; b: number }) => { + toolCallCount++; + return { content: [{ type: 'text', text: String(a + b) }] }; + }, + ); + + // verifyDelayMs >> relay round-trip, so the client's first retry arrives + // while verification is still pending (→ -32043). Default grant TTL (5 min) + // keeps retry_after at 2 s; verification completes well before the backoff. + const processor = new FakePaymentProcessor({ verifyDelayMs: 500 }); + const createSpy = spyOn(processor, 'createPaymentRequired'); + const verifySpy = spyOn(processor, 'verifyPayment'); + + const serverTransport = withServerPayments( + new NostrServerTransport({ + signer: new PrivateKeySigner(serverPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + encryptionMode: EncryptionMode.DISABLED, + }), + { + processors: [processor], + pricedCapabilities: [ + { + method: 'tools/call', + name: 'add', + amount: 1, + currencyUnit: 'test', + }, + ], + paymentInteraction: 'explicit_gating', + }, + ); + await mcpServer.connect(serverTransport); + + const clientSK = generateSecretKey(); + const clientPrivateKey = bytesToHex(clientSK); + const clientTransport = new NostrClientTransport({ + signer: new PrivateKeySigner(clientPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + serverPubkey: serverPublicKey, + encryptionMode: EncryptionMode.DISABLED, + }); + const paidClientTransport = withClientPayments(clientTransport, { + handlers: [], + paymentInteraction: 'explicit_gating', + onPaymentRequired: async () => ({ paid: true }), + }); + + const client = new Client({ + name: 'pending-race-client', + version: '1.0.0', + }); + await client.connect(paidClientTransport); + + const result = await client.callTool({ + name: 'add', + arguments: { a: 5, b: 7 }, + }); + + const typedResult = result as { + content: Array<{ type: string; text?: string }>; + }; + expect(typedResult.content[0]).toMatchObject({ type: 'text', text: '12' }); + + // Despite the request being sent multiple times (initial + retry-after-pay + + // retry-after-32043), exactly one payment was created and one verification ran. + // This is the core anti-double-charge invariant of the explicit-gating flow. + expect(toolCallCount).toBe(1); + expect(createSpy.mock.calls.length).toBe(1); + expect(verifySpy.mock.calls.length).toBe(1); + + await client.close(); + await mcpServer.close(); + }, 25000); + + // User declines to pay: the wrapper synthesizes -32042 with the given reason + // and does not retry. Locks the { paid: false } contract end-to-end. + test('explicit gating: user-declined payment surfaces -32042 and does not retry', async () => { + const serverSK = generateSecretKey(); + const serverPrivateKey = bytesToHex(serverSK); + const serverPublicKey = getPublicKey(serverSK); + + const mcpServer = new McpServer({ + name: 'decline-server', + version: '1.0.0', + }); + let toolCallCount = 0; + mcpServer.registerTool( + 'add', + { + title: 'Addition Tool', + description: 'Add two numbers', + inputSchema: { a: z.number(), b: z.number() }, + }, + async ({ a, b }: { a: number; b: number }) => { + toolCallCount++; + return { content: [{ type: 'text', text: String(a + b) }] }; + }, + ); + + const processor = new FakePaymentProcessor(); + const serverTransport = withServerPayments( + new NostrServerTransport({ + signer: new PrivateKeySigner(serverPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + encryptionMode: EncryptionMode.DISABLED, + }), + { + processors: [processor], + pricedCapabilities: [ + { + method: 'tools/call', + name: 'add', + amount: 1, + currencyUnit: 'test', + }, + ], + paymentInteraction: 'explicit_gating', + }, + ); + await mcpServer.connect(serverTransport); + + const clientSK = generateSecretKey(); + const clientPrivateKey = bytesToHex(clientSK); + const clientTransport = new NostrClientTransport({ + signer: new PrivateKeySigner(clientPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + serverPubkey: serverPublicKey, + encryptionMode: EncryptionMode.DISABLED, + }); + const paidClientTransport = withClientPayments(clientTransport, { + handlers: [], + paymentInteraction: 'explicit_gating', + onPaymentRequired: async () => ({ + paid: false, + reason: 'user_cancelled', + }), + }); + + const client = new Client({ name: 'decline-client', version: '1.0.0' }); + await client.connect(paidClientTransport); + + await expect( + client.callTool({ name: 'add', arguments: { a: 1, b: 2 } }), + ).rejects.toMatchObject({ + code: -32042, + data: { reason: 'user_cancelled' }, + }); + + expect(toolCallCount).toBe(0); + + await client.close(); + await mcpServer.close(); + }, 20000); + + // onPaymentRequired rejects: the wrapper synthesizes -32042 with + // data.type = 'payment_handler_error' and surfaces it to the caller. + test('explicit gating: onPaymentRequired throwing surfaces -32042 with type payment_handler_error', async () => { + const serverSK = generateSecretKey(); + const serverPrivateKey = bytesToHex(serverSK); + const serverPublicKey = getPublicKey(serverSK); + + const mcpServer = new McpServer({ + name: 'handler-error-server', + version: '1.0.0', + }); + let toolCallCount = 0; + mcpServer.registerTool( + 'add', + { + title: 'Addition Tool', + description: 'Add two numbers', + inputSchema: { a: z.number(), b: z.number() }, + }, + async ({ a, b }: { a: number; b: number }) => { + toolCallCount++; + return { content: [{ type: 'text', text: String(a + b) }] }; + }, + ); + + const processor = new FakePaymentProcessor(); + const serverTransport = withServerPayments( + new NostrServerTransport({ + signer: new PrivateKeySigner(serverPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + encryptionMode: EncryptionMode.DISABLED, + }), + { + processors: [processor], + pricedCapabilities: [ + { + method: 'tools/call', + name: 'add', + amount: 1, + currencyUnit: 'test', + }, + ], + paymentInteraction: 'explicit_gating', + }, + ); + await mcpServer.connect(serverTransport); + + const clientSK = generateSecretKey(); + const clientPrivateKey = bytesToHex(clientSK); + const clientTransport = new NostrClientTransport({ + signer: new PrivateKeySigner(clientPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + serverPubkey: serverPublicKey, + encryptionMode: EncryptionMode.DISABLED, + }); + const paidClientTransport = withClientPayments(clientTransport, { + handlers: [], + paymentInteraction: 'explicit_gating', + onPaymentRequired: async () => { + throw new Error('wallet offline'); + }, + }); + + const client = new Client({ + name: 'handler-error-client', + version: '1.0.0', + }); + await client.connect(paidClientTransport); + + await expect( + client.callTool({ name: 'add', arguments: { a: 1, b: 2 } }), + ).rejects.toMatchObject({ + code: -32042, + data: { reason: 'wallet offline', type: 'payment_handler_error' }, + }); + + expect(toolCallCount).toBe(0); + + await client.close(); + await mcpServer.close(); + }, 20000); + + // Verify-failure window: when verification fails after the client paid, the + // server clears pending state and the next retry yields a FRESH invoice + // (distinct pay_req). The client pays twice; the tool runs exactly once. + // Locks wire-level correlation across the verify-failure branch (the double- + // charge window documented on onPaymentRequired). + test('explicit gating: verifyPayment failure yields a fresh invoice on retry', async () => { + const serverSK = generateSecretKey(); + const serverPrivateKey = bytesToHex(serverSK); + const serverPublicKey = getPublicKey(serverSK); + + const mcpServer = new McpServer({ + name: 'fresh-invoice-server', + version: '1.0.0', + }); + let toolCallCount = 0; + mcpServer.registerTool( + 'add', + { + title: 'Addition Tool', + description: 'Add two numbers', + inputSchema: { a: z.number(), b: z.number() }, + }, + async ({ a, b }: { a: number; b: number }) => { + toolCallCount++; + return { content: [{ type: 'text', text: String(a + b) }] }; + }, + ); + + const issuedPayReqs: string[] = []; + let verifyCount = 0; + const processor: PaymentProcessor = { + pmi: 'fake', + async createPaymentRequired(params) { + const pay_req = `pr-${issuedPayReqs.length + 1}`; + issuedPayReqs.push(pay_req); + return { + amount: params.amount, + pay_req, + description: params.description, + pmi: 'fake', + ttl: 300, + }; + }, + async verifyPayment() { + verifyCount += 1; + if (verifyCount === 1) { + throw new Error('settlement failed'); + } + return { _meta: { settled: true } }; + }, + }; + + const serverTransport = withServerPayments( + new NostrServerTransport({ + signer: new PrivateKeySigner(serverPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + encryptionMode: EncryptionMode.DISABLED, + }), + { + processors: [processor], + pricedCapabilities: [ + { + method: 'tools/call', + name: 'add', + amount: 1, + currencyUnit: 'test', + }, + ], + paymentInteraction: 'explicit_gating', + }, + ); + await mcpServer.connect(serverTransport); + + const clientSK = generateSecretKey(); + const clientPrivateKey = bytesToHex(clientSK); + const clientTransport = new NostrClientTransport({ + signer: new PrivateKeySigner(clientPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + serverPubkey: serverPublicKey, + encryptionMode: EncryptionMode.DISABLED, + }); + // Client pays unconditionally, so both invoices get paid. + const paidClientTransport = withClientPayments(clientTransport, { + handlers: [], + paymentInteraction: 'explicit_gating', + onPaymentRequired: async () => ({ paid: true }), + }); + + const client = new Client({ + name: 'fresh-invoice-client', + version: '1.0.0', + }); + await client.connect(paidClientTransport); + + const result = await client.callTool({ + name: 'add', + arguments: { a: 5, b: 7 }, + }); + const typedResult = result as { + content: Array<{ type: string; text?: string }>; + }; + expect(typedResult.content[0]).toMatchObject({ type: 'text', text: '12' }); + + // Two distinct invoices issued; verify ran twice; the tool ran exactly once. + expect(issuedPayReqs).toHaveLength(2); + expect(issuedPayReqs[0]).not.toBe(issuedPayReqs[1]); + expect(verifyCount).toBe(2); + expect(toolCallCount).toBe(1); + + await client.close(); + await mcpServer.close(); + }, 25000); + + // CEP-8 negotiation: a client requesting explicit_gating against a transparent- + // only server receives -32602 with the requested + supported modes. Locks the + // effective-mode-disclosure MUST at the integration level. + test('explicit gating: transparent-only server rejects initialize with -32602', async () => { + const serverSK = generateSecretKey(); + const serverPrivateKey = bytesToHex(serverSK); + const serverPublicKey = getPublicKey(serverSK); + + const mcpServer = new McpServer({ + name: 'transparent-only-server', + version: '1.0.0', + }); + mcpServer.registerTool( + 'add', + { + title: 'Addition Tool', + description: 'Add two numbers', + inputSchema: { a: z.number(), b: z.number() }, + }, + async ({ a, b }: { a: number; b: number }) => { + return { content: [{ type: 'text', text: String(a + b) }] }; + }, + ); + + // No paymentInteraction option → transparent-only server. + const processor = new FakePaymentProcessor(); + const serverTransport = withServerPayments( + new NostrServerTransport({ + signer: new PrivateKeySigner(serverPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + encryptionMode: EncryptionMode.DISABLED, + }), + { + processors: [processor], + pricedCapabilities: [ + { + method: 'tools/call', + name: 'add', + amount: 1, + currencyUnit: 'test', + }, + ], + }, + ); + await mcpServer.connect(serverTransport); + + const clientSK = generateSecretKey(); + const clientPrivateKey = bytesToHex(clientSK); + const clientTransport = new NostrClientTransport({ + signer: new PrivateKeySigner(clientPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + serverPubkey: serverPublicKey, + encryptionMode: EncryptionMode.DISABLED, + }); + const paidClientTransport = withClientPayments(clientTransport, { + handlers: [], + paymentInteraction: 'explicit_gating', + onPaymentRequired: async () => ({ paid: true }), + }); + + const client = new Client({ name: 'negotiation-client', version: '1.0.0' }); + + await expect(client.connect(paidClientTransport)).rejects.toMatchObject({ + code: -32602, + data: { requested: 'explicit_gating', supported: ['transparent'] }, + }); + + await mcpServer.close(); + }, 20000); + + // resolvePrice rejection: server emits payment_rejected instead of requesting + // payment; the client synthesizes -32000 so the caller rejects immediately + // instead of timing out. Locks the full transparent rejection path end-to-end. + test('transparent: resolvePrice rejection surfaces -32000 to the caller', async () => { + const serverSK = generateSecretKey(); + const serverPrivateKey = bytesToHex(serverSK); + const serverPublicKey = getPublicKey(serverSK); + + const mcpServer = new McpServer({ + name: 'reject-server', + version: '1.0.0', + }); + let toolCallCount = 0; + mcpServer.registerTool( + 'add', + { + title: 'Addition Tool', + description: 'Add two numbers', + inputSchema: { a: z.number(), b: z.number() }, + }, + async ({ a, b }: { a: number; b: number }) => { + toolCallCount++; + return { content: [{ type: 'text', text: String(a + b) }] }; + }, + ); + + const processor = new FakePaymentProcessor(); + const serverTransport = withServerPayments( + new NostrServerTransport({ + signer: new PrivateKeySigner(serverPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + encryptionMode: EncryptionMode.DISABLED, + }), + { + processors: [processor], + pricedCapabilities: [ + { + method: 'tools/call', + name: 'add', + amount: 1, + currencyUnit: 'test', + }, + ], + resolvePrice: async () => rejectPrice('Free quota exhausted'), + }, + ); + await mcpServer.connect(serverTransport); + + const clientSK = generateSecretKey(); + const clientPrivateKey = bytesToHex(clientSK); + const clientTransport = new NostrClientTransport({ + signer: new PrivateKeySigner(clientPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + serverPubkey: serverPublicKey, + encryptionMode: EncryptionMode.DISABLED, + }); + const paidClientTransport = withClientPayments(clientTransport, { + handlers: [new FakePaymentHandler({ pmi: 'fake', delayMs: 1 })], + }); + + const client = new Client({ name: 'reject-client', version: '1.0.0' }); + await client.connect(paidClientTransport); + + await expect( + client.callTool({ name: 'add', arguments: { a: 1, b: 2 } }), + ).rejects.toMatchObject({ code: -32000 }); + // McpError wraps the message as 'MCP error -32000: ' + await expect( + client.callTool({ name: 'add', arguments: { a: 3, b: 4 } }), + ).rejects.toThrow('Free quota exhausted'); + + expect(toolCallCount).toBe(0); + + await client.close(); + await mcpServer.close(); + }, 20000); }); From aabfb4ff1b11bbd44c4b7b79839a8efed11774c8 Mon Sep 17 00:00:00 2001 From: ContextVM Date: Mon, 22 Jun 2026 17:08:48 +0200 Subject: [PATCH 17/19] test(payments): add CEP-8 explicit-gating security isolation tests Add test cases that verify a paid grant authorizes exactly one execution of one specific invocation by one specific client. The tests cover isolation on method+params, client pubkey, and JSON-RPC id, ensuring the canonical invocation identity is enforced and aligns with CEP-8 semantics. --- src/payments/server-explicit-gating.test.ts | 264 ++++++++++++++++++++ src/transport/payments-flow.test.ts | 209 +++++++++++++++- 2 files changed, 471 insertions(+), 2 deletions(-) diff --git a/src/payments/server-explicit-gating.test.ts b/src/payments/server-explicit-gating.test.ts index 2056375..2c5b0c9 100644 --- a/src/payments/server-explicit-gating.test.ts +++ b/src/payments/server-explicit-gating.test.ts @@ -6,6 +6,7 @@ import type { import { createExplicitGatingMiddleware } from './server-explicit-gating.js'; import type { ServerPaymentsContext } from './types.js'; import { AuthorizationStore } from './authorization-store.js'; +import { computeCanonicalInvocationIdentity } from './canonical-identity.js'; import { PAYMENT_PENDING_ERROR_CODE, PAYMENT_REQUIRED_ERROR_CODE, @@ -422,4 +423,267 @@ describe('Explicit Gating Middleware', () => { expect(sentResponses[1].error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); expect(createCount).toBe(2); }); + + // --- CEP-8 explicit-gating security invariants --- + // A paid grant authorizes exactly one execution of one specific invocation + // by one specific client. The canonical identity is SHA-256(JCS({method, + // params})) scoped to the client pubkey; the JSON-RPC id MUST NOT affect it. + // These tests lock each isolation axis at the middleware level. + + test('grant for one param set does not authorize a different param set', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [processor], + pricedCapabilities: [...pricedCapabilities], + }, + authorizationStore: store, + sendResponse: async (_pubkey, response) => { + sentResponses.push(response); + }, + }); + + // Grant authorization for add({ a: 1, b: 2 }). + store.grant( + computeCanonicalInvocationIdentity( + ctx.clientPubkey, + message.method, + message.params, + ), + 10000, + ); + + // Different params: add({ a: 9, b: 9 }). + const otherMessage: JSONRPCRequest = { + jsonrpc: '2.0', + id: 'event-id', + method: 'tools/call', + params: { name: 'add', arguments: { a: 9, b: 9 } }, + }; + + let forwarded = false; + await mw(otherMessage, ctx, async () => { + forwarded = true; + }); + + // The grant for {a:1,b:2} must NOT authorize {a:9,b:9}. + expect(forwarded).toBe(false); + expect(sentResponses).toHaveLength(1); + expect(sentResponses[0].error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); + + // The original grant is still consumable by its own params. + let forwardedOriginal = false; + await mw(message, ctx, async () => { + forwardedOriginal = true; + }); + expect(forwardedOriginal).toBe(true); + expect(sentResponses).toHaveLength(1); + }); + + test('grant for one client does not authorize a different client', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [processor], + pricedCapabilities: [...pricedCapabilities], + }, + authorizationStore: store, + sendResponse: async (_pubkey, response) => { + sentResponses.push(response); + }, + }); + + // Grant authorization scoped to 'test-client'. + store.grant( + computeCanonicalInvocationIdentity( + ctx.clientPubkey, + message.method, + message.params, + ), + 10000, + ); + + // Same method + params, but a different client pubkey. + const otherCtx: ServerPaymentsContext = { + ...ctx, + clientPubkey: 'other-client', + }; + + let forwarded = false; + await mw(message, otherCtx, async () => { + forwarded = true; + }); + + // The grant for 'test-client' must NOT authorize 'other-client'. + expect(forwarded).toBe(false); + expect(sentResponses).toHaveLength(1); + expect(sentResponses[0].error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); + + // The original client can still consume its grant. + let forwardedOriginal = false; + await mw(message, ctx, async () => { + forwardedOriginal = true; + }); + expect(forwardedOriginal).toBe(true); + expect(sentResponses).toHaveLength(1); + }); + + test('grant matches across different JSON-RPC ids (id is not part of identity)', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [processor], + pricedCapabilities: [...pricedCapabilities], + }, + authorizationStore: store, + sendResponse: async (_pubkey, response) => { + sentResponses.push(response); + }, + }); + + // Identity is computed from method + params only; the original request's + // id ('event-id') is intentionally excluded from the canonical form. + store.grant( + computeCanonicalInvocationIdentity( + ctx.clientPubkey, + message.method, + message.params, + ), + 10000, + ); + + // Retry with a DIFFERENT JSON-RPC id but identical method + params. + const retryWithDifferentId: JSONRPCRequest = { + ...message, + id: 'a-completely-different-event-id', + }; + + let forwarded = false; + await mw(retryWithDifferentId, ctx, async () => { + forwarded = true; + }); + + // The grant must still match despite the different id. + expect(forwarded).toBe(true); + expect(sentResponses).toHaveLength(0); + }); + + test('concurrent requests after a grant: exactly one consumes it, the other is gated', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [processor], + pricedCapabilities: [...pricedCapabilities], + }, + authorizationStore: store, + sendResponse: async (_pubkey, response) => { + sentResponses.push(response); + }, + }); + + // A single grant is available for this invocation. + store.grant( + computeCanonicalInvocationIdentity( + ctx.clientPubkey, + message.method, + message.params, + ), + 10000, + ); + + let forwards = 0; + const forward = async () => { + forwards += 1; + }; + + // Fire two concurrent middleware calls for the same invocation. + await Promise.all([mw(message, ctx, forward), mw(message, ctx, forward)]); + + // Exactly one consumes the single-use grant and forwards; the other is + // gated with a fresh -32042. claim() is synchronous, so the first call + // to reach it always wins deterministically. + expect(forwards).toBe(1); + expect(sentResponses).toHaveLength(1); + expect(sentResponses[0].error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); + }); + + test('expired grant yields a fresh -32042 instead of forwarding', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [processor], + pricedCapabilities: [...pricedCapabilities], + }, + authorizationStore: store, + sendResponse: async (_pubkey, response) => { + sentResponses.push(response); + }, + }); + + // Grant authorization with a very short TTL. + store.grant( + computeCanonicalInvocationIdentity( + ctx.clientPubkey, + message.method, + message.params, + ), + 50, + ); + + // Wait past the grant TTL so it expires before the retry arrives. + await new Promise((r) => setTimeout(r, 75)); + + // The stale grant must NOT authorize the request: the middleware should + // treat it as unpaid and emit a fresh -32042 rather than forwarding. + let forwarded = false; + await mw(message, ctx, async () => { + forwarded = true; + }); + + expect(forwarded).toBe(false); + expect(sentResponses).toHaveLength(1); + expect(sentResponses[0].error.code).toBe(PAYMENT_REQUIRED_ERROR_CODE); + }); + + test('non-priced capability passes through ungated in explicit gating mode', async () => { + const store = new AuthorizationStore(); + const sentResponses: JSONRPCErrorResponse[] = []; + + const mw = createExplicitGatingMiddleware({ + options: { + processors: [processor], + pricedCapabilities: [...pricedCapabilities], + }, + authorizationStore: store, + sendResponse: async (_pubkey, response) => { + sentResponses.push(response); + }, + }); + + // A tool NOT listed in pricedCapabilities (only 'add' is priced). + const unpricedMessage: JSONRPCRequest = { + jsonrpc: '2.0', + id: 'event-id', + method: 'tools/call', + params: { name: 'free', arguments: {} }, + }; + + let forwarded = false; + await mw(unpricedMessage, ctx, async () => { + forwarded = true; + }); + + expect(forwarded).toBe(true); + expect(sentResponses).toHaveLength(0); + }); }); diff --git a/src/transport/payments-flow.test.ts b/src/transport/payments-flow.test.ts index 67cb5eb..bdd4bc4 100644 --- a/src/transport/payments-flow.test.ts +++ b/src/transport/payments-flow.test.ts @@ -89,6 +89,20 @@ async function captureNextCtxvmEvent(params: { }); } +/** + * Nostr event ids are derived from (content, author, created_at, tags) at + * second granularity. An explicit-gating retry republishes the same JSON-RPC + * request; if it lands in the same second as the original, the identical event + * id is deduplicated by relay subscriptions and the server never sees the + * retry. Sleep past the current second boundary so the retry's event id + * differs. Real-world payment flows naturally take >1s (wallet interaction, + * settlement); this only affects instant-pay tests. + */ +async function sleepPastSecondBoundary(): Promise { + const waitMs = 1000 - (Date.now() % 1000) + 10; + await new Promise((resolve) => setTimeout(resolve, waitMs)); +} + describe.serial('payments fake flow (transport-level)', () => { let stopRelay: (() => void) | undefined; @@ -1079,6 +1093,7 @@ describe.serial('payments fake flow (transport-level)', () => { handlers: [], paymentInteraction: 'explicit_gating', onPaymentRequired: async () => { + await sleepPastSecondBoundary(); explicitPaymentHandled = true; return { paid: true }; }, @@ -1254,7 +1269,10 @@ describe.serial('payments fake flow (transport-level)', () => { const paidClientTransport = withClientPayments(clientTransport, { handlers: [], paymentInteraction: 'explicit_gating', - onPaymentRequired: async () => ({ paid: true }), + onPaymentRequired: async () => { + await sleepPastSecondBoundary(); + return { paid: true }; + }, }); const client = new Client({ @@ -1531,7 +1549,10 @@ describe.serial('payments fake flow (transport-level)', () => { const paidClientTransport = withClientPayments(clientTransport, { handlers: [], paymentInteraction: 'explicit_gating', - onPaymentRequired: async () => ({ paid: true }), + onPaymentRequired: async () => { + await sleepPastSecondBoundary(); + return { paid: true }; + }, }); const client = new Client({ @@ -1559,6 +1580,105 @@ describe.serial('payments fake flow (transport-level)', () => { await mcpServer.close(); }, 25000); + // resolvePrice + explicit_gating integration: a dynamic quote flows through + // the explicit-gating path end-to-end. The quoted amount (not the static + // pricedCapabilities amount) reaches createPaymentRequired, payment succeeds, + // and the tool runs exactly once. + test('explicit gating: resolvePrice quotes a dynamic amount that reaches createPaymentRequired', async () => { + const serverSK = generateSecretKey(); + const serverPublicKey = getPublicKey(serverSK); + const serverPrivateKey = bytesToHex(serverSK); + + const mcpServer = new McpServer({ + name: 'dynamic-price-server', + version: '1.0.0', + }); + let toolCallCount = 0; + mcpServer.registerTool( + 'add', + { + title: 'Addition Tool', + description: 'Add two numbers', + inputSchema: { a: z.number(), b: z.number() }, + }, + async ({ a, b }: { a: number; b: number }) => { + toolCallCount++; + return { content: [{ type: 'text', text: String(a + b) }] }; + }, + ); + + const processor = new FakePaymentProcessor(); + const createSpy = spyOn(processor, 'createPaymentRequired'); + + const serverTransport = withServerPayments( + new NostrServerTransport({ + signer: new PrivateKeySigner(serverPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + encryptionMode: EncryptionMode.DISABLED, + }), + { + processors: [processor], + pricedCapabilities: [ + { + method: 'tools/call', + name: 'add', + amount: 1, // static fallback; resolvePrice overrides this + currencyUnit: 'test', + }, + ], + paymentInteraction: 'explicit_gating', + resolvePrice: async () => ({ + amount: 42, + description: 'dynamic quote', + meta: { quoted: true }, + }), + }, + ); + await mcpServer.connect(serverTransport); + + const clientSK = generateSecretKey(); + const clientPrivateKey = bytesToHex(clientSK); + const clientTransport = new NostrClientTransport({ + signer: new PrivateKeySigner(clientPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + serverPubkey: serverPublicKey, + encryptionMode: EncryptionMode.DISABLED, + }); + const paidClientTransport = withClientPayments(clientTransport, { + handlers: [], + paymentInteraction: 'explicit_gating', + onPaymentRequired: async () => { + await sleepPastSecondBoundary(); + return { paid: true }; + }, + }); + + const client = new Client({ + name: 'dynamic-price-client', + version: '1.0.0', + }); + await client.connect(paidClientTransport); + + const result = await client.callTool({ + name: 'add', + arguments: { a: 5, b: 7 }, + }); + const typedResult = result as { + content: Array<{ type: string; text?: string }>; + }; + expect(typedResult.content[0]).toMatchObject({ type: 'text', text: '12' }); + + // resolvePrice was consulted: createPaymentRequired received the quoted + // amount (42), not the static pricedCapabilities amount (1). + expect(createSpy.mock.calls.length).toBe(1); + expect(createSpy.mock.calls[0][0].amount).toBe(42); + + expect(toolCallCount).toBe(1); + + await client.close(); + await mcpServer.close(); + }, 20000); + // CEP-8 negotiation: a client requesting explicit_gating against a transparent- // only server receives -32602 with the requested + supported modes. Locks the // effective-mode-disclosure MUST at the integration level. @@ -1705,4 +1825,89 @@ describe.serial('payments fake flow (transport-level)', () => { await client.close(); await mcpServer.close(); }, 20000); + + // CEP-8 coexistence: a server that offers explicit_gating is opt-in. When the + // client omits the payment_interaction tag (default transparent), the session + // falls back to transparent mode and the request flows through the transparent + // payment_required path. The reverse direction (client requests, server + // doesn't support) is covered by the -32602 negotiation test above. + test('explicit-capable server falls back to transparent for a transparent client', async () => { + const serverSK = generateSecretKey(); + const serverPrivateKey = bytesToHex(serverSK); + const serverPublicKey = getPublicKey(serverSK); + + const mcpServer = new McpServer({ + name: 'explicit-capable-server', + version: '1.0.0', + }); + let toolCallCount = 0; + mcpServer.registerTool( + 'add', + { + title: 'Addition Tool', + description: 'Add two numbers', + inputSchema: { a: z.number(), b: z.number() }, + }, + async ({ a, b }: { a: number; b: number }) => { + toolCallCount++; + return { content: [{ type: 'text', text: String(a + b) }] }; + }, + ); + + const processor = new FakePaymentProcessor({ verifyDelayMs: 50 }); + const serverTransport = withServerPayments( + new NostrServerTransport({ + signer: new PrivateKeySigner(serverPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + encryptionMode: EncryptionMode.DISABLED, + }), + { + processors: [processor], + pricedCapabilities: [ + { + method: 'tools/call', + name: 'add', + amount: 1, + currencyUnit: 'test', + }, + ], + // Server advertises explicit_gating, but it is opt-in per session. + paymentInteraction: 'explicit_gating', + }, + ); + await mcpServer.connect(serverTransport); + + const clientSK = generateSecretKey(); + const clientPrivateKey = bytesToHex(clientSK); + const clientTransport = new NostrClientTransport({ + signer: new PrivateKeySigner(clientPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + serverPubkey: serverPublicKey, + encryptionMode: EncryptionMode.DISABLED, + }); + // No paymentInteraction option → transparent client with an auto-satisfying + // handler. The server must NOT gate this session with -32042. + const paidClientTransport = withClientPayments(clientTransport, { + handlers: [new FakePaymentHandler({ pmi: 'fake', delayMs: 50 })], + }); + + const client = new Client({ + name: 'transparent-client', + version: '1.0.0', + }); + await client.connect(paidClientTransport); + + const result = await client.callTool({ + name: 'add', + arguments: { a: 2, b: 3 }, + }); + const typedResult = result as { + content: Array<{ type: string; text?: string }>; + }; + expect(typedResult.content[0]).toMatchObject({ type: 'text', text: '5' }); + expect(toolCallCount).toBe(1); + + await client.close(); + await mcpServer.close(); + }, 20000); }); From b469912bb34c60eec3c0929923348322d9f8140b Mon Sep 17 00:00:00 2001 From: Khushvendra Date: Mon, 22 Jun 2026 22:25:48 +0530 Subject: [PATCH 18/19] chore: add minor changeset for CEP-8 explicit gating --- .changeset/calm-wallets-gate.md | 42 +++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 .changeset/calm-wallets-gate.md diff --git a/.changeset/calm-wallets-gate.md b/.changeset/calm-wallets-gate.md new file mode 100644 index 0000000..e0725c7 --- /dev/null +++ b/.changeset/calm-wallets-gate.md @@ -0,0 +1,42 @@ +--- +"@contextvm/sdk": minor +--- + +feat: CEP-8 Explicit Payment Gating lifecycle + +Add full support for the CEP-8 Explicit Gating payment interaction mode (`explicit_gating`), +enabling servers to strictly gate priced MCP capabilities behind verifiable payments before +execution. + +**Protocol** + +- Servers and clients negotiate `payment_interaction` mode via Nostr event tags on the first + direct message. Servers disclose their effective mode on the first response event. +- `-32042 Payment Required`: returned with structured `payment_options` (PMI, amount, pay_req, + description, TTL) when a priced capability is invoked without authorization. +- `-32043 Payment Pending`: returned with `retry_after` backoff when a retry races against + active payment verification, preventing invoice-generation spam. +- `-32602 Invalid Params`: returned with `{ requested, supported }` when a client requests + `explicit_gating` on a transparent-only server. + +**Server** + +- New `createExplicitGatingMiddleware` with TTL-bounded `AuthorizationStore` for single-use, + atomic check-and-set execution grants scoped by canonical invocation identity + (SHA-256 over JCS-canonicalized method + params + client pubkey). +- Shared `resolveAndInitiatePayment` pipeline eliminates duplication between transparent and + explicit-gating server middlewares. + +**Client** + +- `withClientPayments` intercepts `-32042`/`-32043` upstream, delegates to the user's + `onPaymentRequired` handler, and auto-retries the original request with configurable + `maxPendingRetries` and exponential backoff. +- Effective-mode guard prevents auto-satisfying transparent payments when the server rejected + explicit gating—synthesizes a local `-32000` decline instead. + +**Backward Compatibility** + +- 100% backward compatible. Legacy clients not advertising the new mode continue using the + default `transparent` flow. Per-session middleware guards ensure explicit-gating behavior + only activates for sessions that opted in. From b8537ef4751a4342645ab410f13c2c88c58cbf84 Mon Sep 17 00:00:00 2001 From: ContextVM Date: Tue, 23 Jun 2026 14:20:06 +0200 Subject: [PATCH 19/19] feat(payments): add PaymentInteractionPolicy type and optional server default MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Introduce `PaymentInteractionPolicy` (`'optional' | 'transparent'`) to separate the server-side policy from the wire-level `PaymentInteractionMode`. The `withServerPayments` middleware now defaults to `'optional'`, which advertises `explicit_gating` support and mirrors each client's requested lifecycle, allowing explicit-gating clients to be gated while transparent clients keep the notification flow. Pass `'transparent'` for a transparent‑only server. Update the changeset documentation to describe the new policy, the server default change, backward compatibility, and the client’s effective‑mode negotiation behavior. --- .changeset/calm-wallets-gate.md | 16 +- src/payments/server-payments.ts | 11 +- src/payments/server-transport-payments.ts | 27 +++- src/payments/types.ts | 24 ++- src/transport/capability-negotiator.test.ts | 16 ++ src/transport/capability-negotiator.ts | 11 ++ .../nostr-client/inbound-coordinator.ts | 11 +- src/transport/nostr-server-transport.ts | 6 +- .../nostr-server/inbound-coordinator.ts | 11 +- .../nostr-server/outbound-response-router.ts | 16 +- src/transport/payments-flow.test.ts | 145 ++++++++++++++++-- 11 files changed, 262 insertions(+), 32 deletions(-) diff --git a/.changeset/calm-wallets-gate.md b/.changeset/calm-wallets-gate.md index e0725c7..1f8b9e0 100644 --- a/.changeset/calm-wallets-gate.md +++ b/.changeset/calm-wallets-gate.md @@ -26,6 +26,12 @@ execution. (SHA-256 over JCS-canonicalized method + params + client pubkey). - Shared `resolveAndInitiatePayment` pipeline eliminates duplication between transparent and explicit-gating server middlewares. +- New `PaymentInteractionPolicy` type (`'optional' | 'transparent'`) separates the server-side + policy from the wire-level `PaymentInteractionMode`. `withServerPayments` now defaults to + `'optional'`: a server that accepts payments advertises `explicit_gating` support and mirrors + each client's requested lifecycle, so explicit-gating clients are gated while transparent + clients keep the notification flow. Pass `paymentInteraction: 'transparent'` for a + transparent-only server. **Client** @@ -34,9 +40,17 @@ execution. `maxPendingRetries` and exponential backoff. - Effective-mode guard prevents auto-satisfying transparent payments when the server rejected explicit gating—synthesizes a local `-32000` decline instead. +- An inbound `payment_interaction` tag on a server response is now recorded as the session's + effective mode only when the client itself requested `explicit_gating`. Otherwise the tag is + treated as a server availability advertisement, preventing a transparent client from + incorrectly believing it is on the explicit-gating lifecycle. **Backward Compatibility** -- 100% backward compatible. Legacy clients not advertising the new mode continue using the +- Wire and client compatible: legacy clients not advertising the new mode continue using the default `transparent` flow. Per-session middleware guards ensure explicit-gating behavior only activates for sessions that opted in. +- The new `'optional'` server default is a behavioral change for server operators who relied on + the previous implicit transparent-only default: their server now also accepts + `explicit_gating` requests from clients that ask for it. Set `paymentInteraction: 'transparent'` + to restore transparent-only behavior. diff --git a/src/payments/server-payments.ts b/src/payments/server-payments.ts index 7cd3c20..cfdfe31 100644 --- a/src/payments/server-payments.ts +++ b/src/payments/server-payments.ts @@ -2,13 +2,13 @@ import { isJsonRpcRequest } from './types.js'; import type { CorrelatedNotificationSender, PaymentAcceptedNotification, + PaymentInteractionPolicy, PaymentProcessor, PaymentRejectedNotification, PaymentRequiredNotification, PricedCapability, ResolvePriceFn, ServerMiddlewareFn, - PaymentInteractionMode, } from './types.js'; import { LruCache } from '../core/utils/lru-cache.js'; import { withTimeout } from '../core/utils/utils.js'; @@ -50,8 +50,13 @@ export interface ServerPaymentsOptions { */ maxPendingPayments?: number; - /** Effective payment interaction mode for this server instance. @default 'transparent' */ - paymentInteraction?: PaymentInteractionMode; + /** + * Server-side policy for which payment interaction lifecycles this server + * accepts. `optional` mirrors the client's requested mode (the default); + * `transparent` makes the server transparent-only. + * @default 'optional' + */ + paymentInteraction?: PaymentInteractionPolicy; } function purgeExpiredPending(params: { diff --git a/src/payments/server-transport-payments.ts b/src/payments/server-transport-payments.ts index d6aace0..d9e42dd 100644 --- a/src/payments/server-transport-payments.ts +++ b/src/payments/server-transport-payments.ts @@ -1,4 +1,5 @@ import type { NostrServerTransport } from '../transport/nostr-server-transport.js'; +import type { PaymentInteractionPolicy } from './types.js'; import type { ServerPaymentsOptions } from './server-payments.js'; import { createCapTagsFromPricedCapabilities } from './cap-tags.js'; import { createPmiTagsFromProcessors } from './pmi-tags.js'; @@ -11,6 +12,12 @@ import { NOSTR_TAGS } from '../core/constants.js'; /** * Attaches CEP-8 payments gating to a NostrServerTransport. + * + * By default the server uses the `optional` policy: it advertises + * `explicit_gating` support and mirrors each client's requested lifecycle, so a + * client that requests `explicit_gating` is gated while transparent clients keep + * the notification-based flow. Pass `paymentInteraction: 'transparent'` for a + * transparent-only server. */ export function withServerPayments( transport: NostrServerTransport, @@ -22,10 +29,16 @@ export function withServerPayments( createLogger('server-payments'), ); - // CEP-8 discovery tags: advertise supported PMIs + reference pricing on announcement/list events. + const policy: PaymentInteractionPolicy = + options.paymentInteraction ?? 'optional'; + const supportsExplicitGating = policy === 'optional'; + + // CEP-8 discovery tags: advertise supported PMIs + reference pricing on + // announcement/list events. When explicit gating is supported, also advertise + // it as an available opt-in mode (availability, not effective session mode). const extraTags: string[][] = createPmiTagsFromProcessors(options.processors); - if (options.paymentInteraction === 'explicit_gating') { + if (supportsExplicitGating) { extraTags.push([NOSTR_TAGS.PAYMENT_INTERACTION, 'explicit_gating']); } @@ -34,8 +47,9 @@ export function withServerPayments( createCapTagsFromPricedCapabilities(options.pricedCapabilities), ); - // Expose the configured payment interaction mode to the transport coordinator. - transport.setSupportedPaymentInteraction(options.paymentInteraction); + // Expose the configured policy to the transport coordinator so it can accept + // or reject per-session `payment_interaction` requests. + transport.setSupportedPaymentInteraction(policy); transport.addInboundMiddleware( createServerPaymentsMiddleware({ @@ -45,7 +59,10 @@ export function withServerPayments( }), ); - if (options.paymentInteraction === 'explicit_gating') { + // The transparent middleware self-gates on the per-session effective mode, so + // it is safe to register the explicit-gating middleware alongside it. Each + // request is routed to exactly one lifecycle based on the negotiated mode. + if (supportsExplicitGating) { const authorizationStore = new AuthorizationStore({}); transport.addInboundMiddleware( createExplicitGatingMiddleware({ diff --git a/src/payments/types.ts b/src/payments/types.ts index 1e6c939..531821e 100644 --- a/src/payments/types.ts +++ b/src/payments/types.ts @@ -62,9 +62,31 @@ export type PaymentRequiredNotification = JSONRPCNotification & { }; }; -/** CEP-8 payment interaction modes. */ +/** + * CEP-8 payment interaction modes. + * + * These are the wire/session-level modes negotiated via the `payment_interaction` + * tag: `transparent` (default) and `explicit_gating` (opt-in). + */ export type PaymentInteractionMode = 'transparent' | 'explicit_gating'; +/** + * Server-side policy for which payment interaction lifecycles it accepts. + * + * This is a server configuration concern, distinct from the wire-level + * {@link PaymentInteractionMode}. It mirrors the OPTIONAL policy used for + * encryption and gift wrapping, where the peer's chosen mode is mirrored rather + * than forced. + * + * - `optional`: Accept both lifecycles and mirror the client's requested mode + * for the session (the default). A client that requests `explicit_gating` + * gets it; a client that omits the tag or requests `transparent` stays on the + * transparent lifecycle. + * - `transparent`: Transparent-only. Reject `explicit_gating` requests with a + * `-32602` negotiation error per CEP-8 effective-mode disclosure. + */ +export type PaymentInteractionPolicy = 'optional' | 'transparent'; + /** A single payment option inside a -32042 error.data.payment_options entry. */ export interface PaymentOption { amount: number; diff --git a/src/transport/capability-negotiator.test.ts b/src/transport/capability-negotiator.test.ts index 3acbfb0..29b5fbc 100644 --- a/src/transport/capability-negotiator.test.ts +++ b/src/transport/capability-negotiator.test.ts @@ -51,4 +51,20 @@ describe('ClientCapabilityNegotiator', () => { }); expect(afterTags.some((t) => t[0] === 'payment_interaction')).toBe(false); }); + + test('getRequestedPaymentInteraction reflects the negotiated mode', () => { + const negotiator = new ClientCapabilityNegotiator({ + encryptionMode: EncryptionMode.OPTIONAL, + giftWrapMode: GiftWrapMode.EPHEMERAL, + oversizedEnabled: false, + openStreamEnabled: false, + composeOutboundTags: () => [], + }); + + // Defaults to undefined (transparent client). + expect(negotiator.getRequestedPaymentInteraction()).toBeUndefined(); + + negotiator.setPaymentInteraction('explicit_gating'); + expect(negotiator.getRequestedPaymentInteraction()).toBe('explicit_gating'); + }); }); diff --git a/src/transport/capability-negotiator.ts b/src/transport/capability-negotiator.ts index 4e724f5..cf67344 100644 --- a/src/transport/capability-negotiator.ts +++ b/src/transport/capability-negotiator.ts @@ -214,6 +214,17 @@ export class ClientCapabilityNegotiator { this.paymentInteraction = mode; } + /** + * Returns the payment interaction mode this client requested, if any. + * + * Used to distinguish an inbound `payment_interaction` tag observed as the + * session's effective mode (authoritative only when the client requested a + * non-default mode) from a server availability advertisement. + */ + public getRequestedPaymentInteraction(): PaymentInteractionMode | undefined { + return this.paymentInteraction; + } + /** * Updates server capability flags from discovered peer tags. * Called by the transport when it learns new capabilities from inbound events. diff --git a/src/transport/nostr-client/inbound-coordinator.ts b/src/transport/nostr-client/inbound-coordinator.ts index f11a205..8eaa01d 100644 --- a/src/transport/nostr-client/inbound-coordinator.ts +++ b/src/transport/nostr-client/inbound-coordinator.ts @@ -205,7 +205,16 @@ export class ClientInboundCoordinator { (tag) => tag[0] === NOSTR_TAGS.PAYMENT_INTERACTION && typeof tag[1] === 'string', ); - if (paymentInteractionTag) { + if ( + paymentInteractionTag && + // CEP-8: the effective mode observed on a response is authoritative only + // when the client requested a non-default mode. Otherwise the tag is a + // server availability advertisement and MUST NOT be recorded as this + // session's effective mode (which would leave a transparent client + // incorrectly believing it is on the explicit-gating lifecycle). + this.deps.capabilityNegotiator.getRequestedPaymentInteraction() === + 'explicit_gating' + ) { const mode = paymentInteractionTag[1]; if (mode === 'transparent' || mode === 'explicit_gating') { this.deps.metadataStore.setEffectivePaymentInteraction( diff --git a/src/transport/nostr-server-transport.ts b/src/transport/nostr-server-transport.ts index 8b24f8e..42dfbcf 100644 --- a/src/transport/nostr-server-transport.ts +++ b/src/transport/nostr-server-transport.ts @@ -52,7 +52,7 @@ import { ServerOpenStreamFactory } from './nostr-server/open-stream-factory.js'; import { ServerEventPipeline } from './nostr-server/event-pipeline.js'; import { ServerInboundCoordinator } from './nostr-server/inbound-coordinator.js'; import type { InboundMiddlewareFn } from './middleware.js'; -import type { PaymentInteractionMode } from '../payments/types.js'; +import type { PaymentInteractionPolicy } from '../payments/types.js'; export type { InboundMiddlewareFn } from './middleware.js'; /** @@ -489,10 +489,10 @@ export class NostrServerTransport } /** - * Sets the supported payment interaction mode for this server. + * Sets the supported payment interaction policy for this server. */ public setSupportedPaymentInteraction( - mode: PaymentInteractionMode | undefined, + mode: PaymentInteractionPolicy | undefined, ): void { this.inboundCoordinator.setSupportedPaymentInteraction(mode); } diff --git a/src/transport/nostr-server/inbound-coordinator.ts b/src/transport/nostr-server/inbound-coordinator.ts index c451246..0189c18 100644 --- a/src/transport/nostr-server/inbound-coordinator.ts +++ b/src/transport/nostr-server/inbound-coordinator.ts @@ -28,7 +28,10 @@ import { import { GiftWrapMode } from '../../core/interfaces.js'; import { type OpenStreamWriter } from '../open-stream/index.js'; import { UNSUPPORTED_PAYMENT_INTERACTION_ERROR_CODE } from '../../payments/constants.js'; -import type { PaymentInteractionMode } from '../../payments/types.js'; +import type { + PaymentInteractionMode, + PaymentInteractionPolicy, +} from '../../payments/types.js'; export interface ServerInboundCoordinatorDeps { sessionStore: SessionStore; @@ -41,7 +44,7 @@ export interface ServerInboundCoordinatorDeps { oversizedEnabled: boolean; openStreamEnabled: boolean; giftWrapMode: GiftWrapMode; - supportedPaymentInteraction?: PaymentInteractionMode; + supportedPaymentInteraction?: PaymentInteractionPolicy; sendMcpMessage: ( msg: JSONRPCMessage, pubkey: string, @@ -80,7 +83,7 @@ export class ServerInboundCoordinator { } public setSupportedPaymentInteraction( - mode: PaymentInteractionMode | undefined, + mode: PaymentInteractionPolicy | undefined, ): void { this.deps.supportedPaymentInteraction = mode; } @@ -176,7 +179,7 @@ export class ServerInboundCoordinator { .map((tag) => tag[1] as string); const serverSupportsExplicitGating = - this.deps.supportedPaymentInteraction === 'explicit_gating'; + this.deps.supportedPaymentInteraction === 'optional'; const paymentInteractionTag = event.tags.find( (tag) => diff --git a/src/transport/nostr-server/outbound-response-router.ts b/src/transport/nostr-server/outbound-response-router.ts index 4759867..d70cdbd 100644 --- a/src/transport/nostr-server/outbound-response-router.ts +++ b/src/transport/nostr-server/outbound-response-router.ts @@ -319,17 +319,23 @@ export class OutboundResponseRouter { tags: string[][], session: ClientSession, ): void { - // CEP-8: Disclose effective mode on first response if client requested a non-default mode + // CEP-8: Disclose effective mode on first response if client requested a non-default mode. if ( session.requestedPaymentInteraction && session.requestedPaymentInteraction !== 'transparent' && !session.hasDisclosedPaymentInteraction && session.effectivePaymentInteraction ) { - tags.push([ - NOSTR_TAGS.PAYMENT_INTERACTION, - session.effectivePaymentInteraction, - ]); + const effective = session.effectivePaymentInteraction; + // The availability advertisement (extraCommonTags) may already be flushed + // onto this first response with the same value. Avoid emitting a duplicate + // tag; the existing one already satisfies the disclosure obligation. + const alreadyPresent = tags.some( + (t) => t[0] === NOSTR_TAGS.PAYMENT_INTERACTION && t[1] === effective, + ); + if (!alreadyPresent) { + tags.push([NOSTR_TAGS.PAYMENT_INTERACTION, effective]); + } session.hasDisclosedPaymentInteraction = true; } } diff --git a/src/transport/payments-flow.test.ts b/src/transport/payments-flow.test.ts index bdd4bc4..17cecee 100644 --- a/src/transport/payments-flow.test.ts +++ b/src/transport/payments-flow.test.ts @@ -1071,7 +1071,7 @@ describe.serial('payments fake flow (transport-level)', () => { { processors: [processor], pricedCapabilities: [...pricedCapabilities], - paymentInteraction: 'explicit_gating', + paymentInteraction: 'optional', }, ); @@ -1160,7 +1160,7 @@ describe.serial('payments fake flow (transport-level)', () => { currencyUnit: 'test', }, ], - paymentInteraction: 'explicit_gating', + paymentInteraction: 'optional', }, ); await mcpServer.connect(serverTransport); @@ -1253,7 +1253,7 @@ describe.serial('payments fake flow (transport-level)', () => { currencyUnit: 'test', }, ], - paymentInteraction: 'explicit_gating', + paymentInteraction: 'optional', }, ); await mcpServer.connect(serverTransport); @@ -1344,7 +1344,7 @@ describe.serial('payments fake flow (transport-level)', () => { currencyUnit: 'test', }, ], - paymentInteraction: 'explicit_gating', + paymentInteraction: 'optional', }, ); await mcpServer.connect(serverTransport); @@ -1424,7 +1424,7 @@ describe.serial('payments fake flow (transport-level)', () => { currencyUnit: 'test', }, ], - paymentInteraction: 'explicit_gating', + paymentInteraction: 'optional', }, ); await mcpServer.connect(serverTransport); @@ -1532,7 +1532,7 @@ describe.serial('payments fake flow (transport-level)', () => { currencyUnit: 'test', }, ], - paymentInteraction: 'explicit_gating', + paymentInteraction: 'optional', }, ); await mcpServer.connect(serverTransport); @@ -1626,7 +1626,7 @@ describe.serial('payments fake flow (transport-level)', () => { currencyUnit: 'test', }, ], - paymentInteraction: 'explicit_gating', + paymentInteraction: 'optional', resolvePrice: async () => ({ amount: 42, description: 'dynamic quote', @@ -1703,7 +1703,7 @@ describe.serial('payments fake flow (transport-level)', () => { }, ); - // No paymentInteraction option → transparent-only server. + // Explicitly transparent-only: rejects explicit_gating negotiation. const processor = new FakePaymentProcessor(); const serverTransport = withServerPayments( new NostrServerTransport({ @@ -1721,6 +1721,7 @@ describe.serial('payments fake flow (transport-level)', () => { currencyUnit: 'test', }, ], + paymentInteraction: 'transparent', }, ); await mcpServer.connect(serverTransport); @@ -1872,7 +1873,7 @@ describe.serial('payments fake flow (transport-level)', () => { }, ], // Server advertises explicit_gating, but it is opt-in per session. - paymentInteraction: 'explicit_gating', + paymentInteraction: 'optional', }, ); await mcpServer.connect(serverTransport); @@ -1910,4 +1911,130 @@ describe.serial('payments fake flow (transport-level)', () => { await client.close(); await mcpServer.close(); }, 20000); + + // CEP-8 optional default: when `paymentInteraction` is omitted the server + // defaults to the optional policy and mirrors each client's requested + // lifecycle. A transparent client (no tag) gets the notification flow, while + // an explicit-gating client is gated. Locks the new default + mirror behavior. + test('optional default (omitted paymentInteraction): server mirrors the lifecycle each client requests', async () => { + const serverSK = generateSecretKey(); + const serverPublicKey = getPublicKey(serverSK); + const serverPrivateKey = bytesToHex(serverSK); + + const mcpServer = new McpServer({ + name: 'optional-default-server', + version: '1.0.0', + }); + let toolCallCount = 0; + mcpServer.registerTool( + 'add', + { + title: 'Addition Tool', + description: 'Add two numbers', + inputSchema: { a: z.number(), b: z.number() }, + }, + async ({ a, b }: { a: number; b: number }) => { + toolCallCount++; + return { content: [{ type: 'text', text: String(a + b) }] }; + }, + ); + + const processor = new FakePaymentProcessor({ verifyDelayMs: 50 }); + // NOTE: no paymentInteraction option → defaults to 'optional'. + const serverTransport = withServerPayments( + new NostrServerTransport({ + signer: new PrivateKeySigner(serverPrivateKey), + relayHandler: new ApplesauceRelayPool([relayUrl]), + encryptionMode: EncryptionMode.DISABLED, + }), + { + processors: [processor], + pricedCapabilities: [ + { + method: 'tools/call', + name: 'add', + amount: 1, + currencyUnit: 'test', + }, + ], + }, + ); + await mcpServer.connect(serverTransport); + + // --- Transparent client (omits payment_interaction): stays on notifications --- + await sleepPastSecondBoundary(); + const transparentSK = generateSecretKey(); + const transparentTransport = new NostrClientTransport({ + signer: new PrivateKeySigner(bytesToHex(transparentSK)), + relayHandler: new ApplesauceRelayPool([relayUrl]), + serverPubkey: serverPublicKey, + encryptionMode: EncryptionMode.DISABLED, + }); + const transparentPaid = withClientPayments(transparentTransport, { + handlers: [new FakePaymentHandler({ pmi: 'fake', delayMs: 10 })], + }); + const transparentClient = new Client({ + name: 'transparent-client', + version: '1.0.0', + }); + await transparentClient.connect(transparentPaid); + + const transparentResult = await transparentClient.callTool({ + name: 'add', + arguments: { a: 1, b: 2 }, + }); + const transparentTyped = transparentResult as { + content: Array<{ type: string; text?: string }>; + }; + expect(transparentTyped.content[0]).toMatchObject({ + type: 'text', + text: '3', + }); + + await transparentClient.close(); + + // --- Explicit-gating client (requests payment_interaction=explicit_gating): gated --- + await sleepPastSecondBoundary(); + let explicitHandled = false; + const explicitSK = generateSecretKey(); + const explicitTransport = new NostrClientTransport({ + signer: new PrivateKeySigner(bytesToHex(explicitSK)), + relayHandler: new ApplesauceRelayPool([relayUrl]), + serverPubkey: serverPublicKey, + encryptionMode: EncryptionMode.DISABLED, + }); + const explicitPaid = withClientPayments(explicitTransport, { + handlers: [], + paymentInteraction: 'explicit_gating', + onPaymentRequired: async () => { + await sleepPastSecondBoundary(); + explicitHandled = true; + return { paid: true }; + }, + }); + const explicitClient = new Client({ + name: 'explicit-client', + version: '1.0.0', + }); + await explicitClient.connect(explicitPaid); + + const explicitResult = await explicitClient.callTool({ + name: 'add', + arguments: { a: 4, b: 5 }, + }); + const explicitTyped = explicitResult as { + content: Array<{ type: string; text?: string }>; + }; + expect(explicitTyped.content[0]).toMatchObject({ + type: 'text', + text: '9', + }); + expect(explicitHandled).toBe(true); + + // Both lifecycles reached the underlying handler exactly once. + expect(toolCallCount).toBe(2); + + await explicitClient.close(); + await mcpServer.close(); + }, 20000); });