Horde RPC Library

RPC adapters for Horde's API system. Modern implementations share a dispatch layer (ApiProviderInterface, MethodInvokerInterface) across protocols — write a provider once, serve it over JSON-RPC, MCP, and SOAP.

Protocols

JSON-RPC

Modern	src/JsonRpc/ — PSR-7/15/18, JSON-RPC 1.1 and 2.0
Legacy	lib/Horde/Rpc/Jsonrpc.php
Docs	doc/JSONRPC-USAGE.md

MCP (Model Context Protocol)

Modern	src/Mcp/ — MCP spec, Streamable HTTP transport
Docs	doc/MCP-USAGE.md

SOAP

Modern	src/Soap/ — PSR-15, ext-soap (optional) in WSDL-less mode
Legacy	lib/Horde/Rpc/Soap.php
Docs	doc/SOAP-USAGE.md

XML-RPC

Legacy	lib/Horde/Rpc/Xmlrpc.php — requires ext-xmlrpc, will probably not work in most modern PHP installations XML-RPC spec

Delegation Protocols

These delegate to other Horde packages:

• ActiveSync — lib/Horde/Rpc/ActiveSync.php → horde/activesync
• WebDAV / CalDAV / CardDAV — lib/Horde/Rpc/Webdav.php → horde/dav
• SyncML — lib/Horde/Rpc/Syncml.php → horde/syncml (deprecated)
• PHPGroupware XML-RPC — lib/Horde/Rpc/Phpgw.php (deprecated)

Shared Dispatch Layer

JsonRpcHandler ──┐
McpServer ───────┤── ApiProviderInterface / MethodInvokerInterface
SoapHandler ─────┘

Providers

CallableMapProvider - a generic map of callables to API names MathApiProvider - an educational example API provider HordeRegistryApiProvider - Integrates the Horde Registry Inter-App API

All modern handlers implement both RequestHandlerInterface and MiddlewareInterface for flexible middleware stacking.