Add user settings cloud sync (GetUserSettings / SetUserSettings)

[Copilot]

• Explore codebase and understand existing patterns
• Run existing tests (40 pass)
• Create migration file for user_settings table (migrations/0004_add_user_settings.sql)
• Add SetUserSettings endpoint to Process.ts
• Add GetUserSettings endpoint to Process.ts
• Add tests for both new endpoints (48 total, all pass)
• Code review feedback addressed (size limit, shape validation, atomic upsert)
• Fix failing test: update SetUserSettings updates existing settings row to simulate PK conflict instead of checking GetTableSize
• CodeQL security scan: 0 alerts

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Summary by cubic

Adds a backend API to sync user settings across devices. Stores per-user settings in D1 and requires a valid phpsessid; the frontend calls it from XMOJ-Script (XMOJ.user.js).

• New Features

  • New endpoints GetUserSettings/SetUserSettings for the logged-in user (JSON object only; 10k max; returns {} when unset; reports corrupted data).
  • D1 persistence in user_settings keyed by user_id.
  • Requests are session-guarded and reject missing/invalid phpsessid.

• Bug Fixes

  • Removed race conditions by inserting first and updating on unique-key conflicts; tests cover insert/update paths, invalid/corrupted JSON, and the update test now simulates a PK conflict to assert the upsert path.

^{Written for commit 791dc79. Summary will update on new commits.}

[Copilot]

Pull request overview

Adds authenticated, D1-backed API support for syncing per-user script settings across devices via two new endpoints.

Changes:

• Introduces SetUserSettings to validate and persist a JSON settings object for the authenticated user.
• Introduces GetUserSettings to retrieve stored settings (or {} when none exist) and report corrupted stored data.
• Adds a D1 migration creating the user_settings table and unit tests covering the new endpoints.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
Source/Process.ts	Adds SetUserSettings / GetUserSettings Process endpoints with JSON validation and D1 persistence.
migrations/0004_add_user_settings.sql	Creates user_settings table keyed by user_id with a JSON-string settings column.
test/process.test.js	Adds tests for insert/update flows, invalid JSON handling, empty settings, and corrupted stored JSON.

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[cubic-dev-ai]

1 issue found across 3 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="Source/Process.ts">

<violation number="1" location="Source/Process.ts:1509">
P2: The check-then-insert/update flow is race-prone; concurrent saves can hit a duplicate-key failure on first write for the same user.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[PythonSmall-Q]

@copilot fix failed test

[Copilot]

@copilot fix failed test

Fixed in 791dc79. The test SetUserSettings updates existing settings row was written for the old check-then-insert/update flow, but the code was updated (per review) to use an atomic insert-first/catch-on-conflict approach. Updated the test to simulate a primary key UNIQUE constraint failed error from Insert, which then triggers the Update fallback — matching the actual runtime behaviour.

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[PythonSmall-Q]

// Save — serialize all UserScript-Setting-* localStorage keys
RequestAPI("SetUserSettings", {
    Settings: JSON.stringify(
        Object.fromEntries(
            Object.keys(localStorage)
                .filter(k => k.startsWith("UserScript-Setting-"))
                .map(k => [k.replace("UserScript-Setting-", ""), localStorage.getItem(k)])
        )
    )
}, (res) => { /* handle */ });

// Load — restore into localStorage
RequestAPI("GetUserSettings", {}, (res) => {
    if (res.Success) {
        for (const [key, value] of Object.entries(res.Data.Settings))
            localStorage.setItem("UserScript-Setting-" + key, value);
    }
});

[cubic-dev-ai]

1 issue found across 2 files (changes from recent commits).

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="Source/Process.ts">

<violation number="1" location="Source/Process.ts:1529">
P1: Duplicate-key fallback is unreachable because `ThrowErrorIfFailed` throws `Result`, not `Error`, so existing-user updates can fail instead of running the update path.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[cubic-dev-ai]

P1: Duplicate-key fallback is unreachable because ThrowErrorIfFailed throws Result, not Error, so existing-user updates can fail instead of running the update path.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At Source/Process.ts, line 1529:

<comment>Duplicate-key fallback is unreachable because `ThrowErrorIfFailed` throws `Result`, not `Error`, so existing-user updates can fail instead of running the update path.</comment>

<file context>
@@ -1493,32 +1493,50 @@ export class Process {
-          user_id: this.Username
-        }));
+      } catch (e) {
+        if (e instanceof Error && /UNIQUE|constraint|duplicate/i.test(e.message)) {
+          // Row for this user_id already exists, perform an update instead.
+          ThrowErrorIfFailed(await this.XMOJDatabase.Update("user_settings", {
</file context>

Suggested change

	if (e instanceof Error && /UNIQUE|constraint|duplicate/i.test(e.message)) {
	const errorMessage = e instanceof Error ? e.message : (typeof e === "object" && e !== null && "Message" in e ? String((e as { Message?: unknown }).Message) : String(e));
	if (/UNIQUE|constraint|duplicate/i.test(errorMessage)) {