fix: address Qodo code review findings

- Add missing snapshot-differ.test.ts to npm test script
- Fix path traversal vulnerability in agent-mail.ts with message ID validation
- Fix readLastTouchedVersion to log errors instead of silently swallowing them
- Sanitize log statements to not leak full paths
- Add projectRoot validation to all API routes
- Fix activity persistence write race conditions with promise chaining

Co-authored-by: openhands <openhands@all-hands.dev>

package.json

@@ -9,7 +9,7 @@
     "start": "next start",
     "lint": "eslint .",
     "typecheck": "tsc --noEmit",
-    "test": "node --test tests/bootstrap.test.mjs && node --import tsx --test tests/lib/parser.test.ts && node --import tsx --test tests/lib/pathing.test.ts && node --import tsx --test tests/lib/project-context.test.ts && node --import tsx --test tests/lib/project-scope.test.ts && node --import tsx --test tests/lib/aggregate-read.test.ts && node --import tsx --test tests/lib/kanban.test.ts && node --import tsx --test tests/lib/graph.test.ts && node --import tsx --test tests/lib/graph-view.test.ts && node --import tsx --test tests/lib/read-text-retry.test.ts && node --import tsx --test tests/lib/read-issues.test.ts && node --import tsx --test tests/lib/bd-path.test.ts && node --import tsx --test tests/lib/bridge.test.ts && node --import tsx --test tests/lib/mutations.test.ts && node --import tsx --test tests/lib/issue-editor.test.ts && node --import tsx --test tests/lib/writeback.test.ts && node --import tsx --test tests/lib/realtime.test.ts && node --import tsx --test tests/lib/coalescer.test.ts && node --import tsx --test tests/lib/watcher.test.ts && node --import tsx --test tests/lib/registry.test.ts && node --import tsx --test tests/lib/agent-registry.test.ts && node --import tsx --test tests/lib/agent-mail.test.ts && node --import tsx --test tests/lib/agent-reservations.test.ts && node --import tsx --test tests/lib/scanner.test.ts && node --import tsx --test tests/skills/beadboard-driver/resolve-bb.test.ts && node --import tsx --test tests/skills/beadboard-driver/generate-agent-name.test.ts && node --import tsx --test tests/skills/beadboard-driver/session-preflight.test.ts && node --import tsx --test tests/skills/beadboard-driver/readiness-report.test.ts && node --import tsx --test tests/skills/beadboard-driver/skill-local-runner.test.ts && node --import tsx --test tests/api/projects-route.test.ts && node --import tsx --test tests/api/mutations-routes.test.ts && node --import tsx --test tests/api/events-route.test.ts && node --test tests/guards/no-direct-jsonl-write.test.mjs && node --test tests/guards/no-inline-style-in-kanban.test.mjs && node --test tests/guards/kanban-responsive-contract.test.mjs && node --test tests/guards/graph-responsive-contract.test.mjs"
+    "test": "node --test tests/bootstrap.test.mjs && node --import tsx --test tests/lib/parser.test.ts && node --import tsx --test tests/lib/pathing.test.ts && node --import tsx --test tests/lib/project-context.test.ts && node --import tsx --test tests/lib/project-scope.test.ts && node --import tsx --test tests/lib/aggregate-read.test.ts && node --import tsx --test tests/lib/kanban.test.ts && node --import tsx --test tests/lib/graph.test.ts && node --import tsx --test tests/lib/graph-view.test.ts && node --import tsx --test tests/lib/read-text-retry.test.ts && node --import tsx --test tests/lib/read-issues.test.ts && node --import tsx --test tests/lib/bd-path.test.ts && node --import tsx --test tests/lib/bridge.test.ts && node --import tsx --test tests/lib/mutations.test.ts && node --import tsx --test tests/lib/issue-editor.test.ts && node --import tsx --test tests/lib/writeback.test.ts && node --import tsx --test tests/lib/realtime.test.ts && node --import tsx --test tests/lib/coalescer.test.ts && node --import tsx --test tests/lib/snapshot-differ.test.ts && node --import tsx --test tests/lib/watcher.test.ts && node --import tsx --test tests/lib/registry.test.ts && node --import tsx --test tests/lib/agent-registry.test.ts && node --import tsx --test tests/lib/agent-mail.test.ts && node --import tsx --test tests/lib/agent-reservations.test.ts && node --import tsx --test tests/lib/scanner.test.ts && node --import tsx --test tests/skills/beadboard-driver/resolve-bb.test.ts && node --import tsx --test tests/skills/beadboard-driver/generate-agent-name.test.ts && node --import tsx --test tests/skills/beadboard-driver/session-preflight.test.ts && node --import tsx --test tests/skills/beadboard-driver/readiness-report.test.ts && node --import tsx --test tests/skills/beadboard-driver/skill-local-runner.test.ts && node --import tsx --test tests/api/projects-route.test.ts && node --import tsx --test tests/api/mutations-routes.test.ts && node --import tsx --test tests/api/events-route.test.ts && node --test tests/guards/no-direct-jsonl-write.test.mjs && node --test tests/guards/no-inline-style-in-kanban.test.mjs && node --test tests/guards/kanban-responsive-contract.test.mjs && node --test tests/guards/graph-responsive-contract.test.mjs"
   },
   "dependencies": {
     "@xyflow/react": "^12.10.0",

src/app/api/activity/route.ts

@@ -1,9 +1,26 @@
 import { activityEventBus } from '../../../lib/realtime';
 
+function isValidProjectRoot(root: string): boolean {
+  try {
+    const resolved = require('path').resolve(root);
+    return require('path').isAbsolute(resolved);
+  } catch {
+    return false;
+  }
+}
+
 export async function GET(request: Request): Promise<Response> {
   const url = new URL(request.url);
-  const projectRoot = url.searchParams.get('projectRoot') || undefined;
+  const projectRootParam = url.searchParams.get('projectRoot');
+  
+  if (projectRootParam && !isValidProjectRoot(projectRootParam)) {
+    return NextResponse.json(
+      { error: 'Invalid projectRoot path' },
+      { status: 400 }
+    );
+  }
 
+  const projectRoot = projectRootParam || undefined;
   const history = activityEventBus.getHistory(projectRoot);
 
   return Response.json(history);

src/app/api/agents/[agentId]/stats/route.ts

@@ -1,15 +1,30 @@
 import { NextResponse } from 'next/server';
+import path from 'node:path';
 import { readIssuesFromDisk } from '../../../../../lib/read-issues';
 import { activityEventBus } from '../../../../../lib/realtime';
 import { getAgentMetrics } from '../../../../../lib/agent-sessions';
 
+function isValidProjectRoot(root: string): boolean {
+  try {
+    const resolved = path.resolve(root);
+    return path.isAbsolute(resolved);
+  } catch {
+    return false;
+  }
+}
+
 export async function GET(
   request: Request,
   { params }: { params: Promise<{ agentId: string }> }
 ): Promise<Response> {
   const { agentId } = await params;
   const url = new URL(request.url);
-  const projectRoot = url.searchParams.get('projectRoot') ?? process.cwd();
+  const projectRootParam = url.searchParams.get('projectRoot');
+  const projectRoot = projectRootParam ?? process.cwd();
+
+  if (projectRootParam && !isValidProjectRoot(projectRootParam)) {
+    return NextResponse.json({ ok: false, error: 'Invalid projectRoot path' }, { status: 400 });
+  }
 
   try {
     const issues = await readIssuesFromDisk({ projectRoot, preferBd: true });

src/app/api/beads/read/route.ts

@@ -1,10 +1,27 @@
 import { NextResponse } from 'next/server';
-
+import path from 'node:path';
 import { readIssuesFromDisk } from '../../../../lib/read-issues';
 
+function isValidProjectRoot(root: string): boolean {
+  try {
+    const resolved = path.resolve(root);
+    return path.isAbsolute(resolved);
+  } catch {
+    return false;
+  }
+}
+
 export async function GET(request: Request): Promise<Response> {
   const url = new URL(request.url);
-  const projectRoot = url.searchParams.get('projectRoot') ?? process.cwd();
+  const projectRootParam = url.searchParams.get('projectRoot');
+  const projectRoot = projectRootParam ?? process.cwd();
+
+  if (projectRootParam && !isValidProjectRoot(projectRootParam)) {
+    return NextResponse.json(
+      { ok: false, error: { classification: 'validation', message: 'Invalid projectRoot path' } },
+      { status: 400 }
+    );
+  }
 
   try {
     const issues = await readIssuesFromDisk({ projectRoot, preferBd: true });

src/app/api/events/route.ts

@@ -17,6 +17,8 @@ async function readLastTouchedVersion(filePath: string): Promise<number | null>
     if ((error as NodeJS.ErrnoException).code === 'ENOENT') {
       return null;
     }
+    // Log non-ENOENT errors but don't swallow them silently
+    console.error('[Events] Failed to read last-touched version:', error);
     return null;
   }
 }

src/app/api/sessions/route.ts

@@ -3,11 +3,30 @@ import { readIssuesFromDisk } from '../../../lib/read-issues';
 import { activityEventBus } from '../../../lib/realtime';
 import { buildSessionTaskFeed, getCommunicationSummary } from '../../../lib/agent-sessions';
 
+function isValidProjectRoot(root: string): boolean {
+  // Basic validation: path should not contain traversal patterns
+  // and should resolve to an absolute path
+  try {
+    const resolved = require('path').resolve(root);
+    return require('path').isAbsolute(resolved);
+  } catch {
+    return false;
+  }
+}
+
 export const dynamic = 'force-dynamic';
 
 export async function GET(request: Request): Promise<Response> {
   const url = new URL(request.url);
-  const projectRoot = url.searchParams.get('projectRoot') ?? process.cwd();
+  const projectRootParam = url.searchParams.get('projectRoot');
+  const projectRoot = projectRootParam ?? process.cwd();
+
+  if (projectRootParam && !isValidProjectRoot(projectRoot)) {
+    return NextResponse.json(
+      { ok: false, error: { classification: 'validation', message: 'Invalid projectRoot path' } },
+      { status: 400 }
+    );
+  }
 
   try {
     const issues = await readIssuesFromDisk({ projectRoot, preferBd: true });

src/lib/agent-mail.ts

@@ -98,6 +98,12 @@ function trimOrEmpty(value: unknown): string {
   return typeof value === 'string' ? value.trim() : '';
 }
 
+function isValidMessageId(value: string): boolean {
+  // Message IDs must be alphanumeric with underscores, hyphens, and colons
+  // This prevents path traversal attacks
+  return /^[a-zA-Z0-9_\-:]+$/.test(value);
+}
+
 function success<T>(command: MailCommandName, data: T): MailCommandResponse<T> {
   return {
     ok: true,
@@ -330,6 +336,10 @@ export async function readAgentMessage(
     return invalid(command, 'MESSAGE_NOT_FOUND', 'Message id is required.');
   }
 
+  if (!isValidMessageId(messageId)) {
+    return invalid(command, 'INVALID_MESSAGE_ID', 'Message id contains invalid characters.');
+  }
+
   try {
     const existing = await readMessageIndex(messageId);
     if (!existing) {
@@ -374,6 +384,10 @@ export async function ackAgentMessage(
     return invalid(command, 'MESSAGE_NOT_FOUND', 'Message id is required.');
   }
 
+  if (!isValidMessageId(messageId)) {
+    return invalid(command, 'INVALID_MESSAGE_ID', 'Message id contains invalid characters.');
+  }
+
   try {
     const existing = await readMessageIndex(messageId);
     if (!existing) {

src/lib/realtime.ts

@@ -38,7 +38,7 @@ export class IssuesEventBus {
   private nextSubscriberId = 1;
 
   emit(projectRoot: string, changedPath?: string, kind: IssuesChangeKind = 'changed'): IssuesChangedEvent {
-    console.log(`[IssuesBus] Emitting event: ${kind} for ${projectRoot} (${changedPath})`);
+    console.log(`[IssuesBus] Emitting event: ${kind} for project (${changedPath ? path.basename(changedPath) : 'unknown'})`);
     const canonicalProjectRoot = canonicalizeWindowsPath(projectRoot);
     const projectKey = windowsPathKey(canonicalProjectRoot);
     const event: IssuesChangedEvent = {
@@ -94,6 +94,7 @@ export class ActivityEventBus {
   private readonly history: ActivityEvent[] = [];
   private readonly MAX_HISTORY = 100;
   private initialized = false;
+  private savePromise: Promise<void> | null = null;
 
   private nextSubscriberId = 1;
 
@@ -121,8 +122,22 @@ export class ActivityEventBus {
       this.history.pop();
     }
 
-    // Persist async
-    void saveActivityHistory(this.history);
+    // Persist async with deduplication - wait for any pending save to complete
+    const currentHistory = [...this.history];
+    const persist = async () => {
+      try {
+        await saveActivityHistory(currentHistory);
+      } catch (error) {
+        console.error('[ActivityEventBus] Failed to save history:', error);
+      }
+    };
+    
+    if (this.savePromise === null) {
+      this.savePromise = persist();
+    } else {
+      // Chain to existing promise to prevent concurrent writes
+      this.savePromise = this.savePromise.then(persist);
+    }
 
     for (const subscriber of this.subscribers.values()) {
       if (!subscriber.projectKey || subscriber.projectKey === projectKey) {