fix(proxy): bridge ticketed PTY WebSockets for remote terminals

[chriswritescode-dev]

Summary

The Manager's OpenCode proxy refused every WebSocket upgrade, so a remote TUI could not open a terminal.

• createOpenCodeProxyRoutes returned 501 for any upgrade, and its internal-token middleware required an Authorization header that WebSocket clients cannot send, so the terminal socket never connected when attached remotely.
• A ticketed PTY connect (/api/pty/:id/connect, /api/experimental/persistent-pty/:id/connect) now skips the Manager token check and is bridged to the OpenCode server's matching socket. The ticket is minted through the authenticated proxy, is single-use, and is validated by the OpenCode server.
• Upgrades without a ticket still require the internal token, and non-PTY upgrades still return 501.
• createOpenCodeProxyRoutes takes the Hono upgradeWebSocket helper, wired from index.ts.
• The resolved directory is added as location[directory] on the socket, since the x-opencode-directory header cannot travel on a WebSocket.

Type of Change

• Bug fix
• New feature
• Refactor
• Documentation

Checklist

• Code follows project style (no comments, named imports)
• TypeScript types are properly defined
• Tests added/updated (80% coverage target)
• pnpm lint passes locally
• pnpm typecheck passes locally

Backend typecheck is clean and pnpm lint reports 0 errors (41 pre-existing no-explicit-any warnings). backend/test/routes/opencode-proxy.test.ts passes (51 tests), including a new end-to-end test against the shipped OpenCode 2 binary that creates a PTY through the repo proxy, mints a ticket, connects without an Authorization header, and round-trips echo.

Summary by CodeRabbit

• New Features
  • Remote terminal sessions can connect through the proxy with a valid connection ticket, enabling shell input and output over WebSockets without an Authorization header.
  • Terminal connections receive a workspace directory when one is available.
• Bug Fixes
  • Closing all terminals now also cleans up persistent terminals across sessions.
  • WebSocket connections handle slow or failed upstream connections more reliably, and requests from untrusted origins are rejected.

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Repository UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 703b0a70-19ca-4e28-97f1-4bc78782efc3

📥 Commits

Reviewing files that changed from the base of the PR and between 98668f6 and 958cf7c.

📒 Files selected for processing (13)

• backend/src/routes/opencode-proxy.ts
• backend/src/routes/repo-terminal-socket.ts
• backend/src/services/opencode/upstream.ts
• backend/src/services/preview/gateway.ts
• backend/src/services/terminal.ts
• backend/src/utils/websocket-bridge.ts
• backend/test/helpers/websocket-server.ts
• backend/test/routes/opencode-proxy.test.ts
• backend/test/routes/repo-terminal-socket.test.ts
• backend/test/services/opencode/upstream.test.ts
• backend/test/services/preview/gateway-ws.test.ts
• backend/test/services/terminal.test.ts
• backend/test/utils/websocket-bridge.test.ts

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📝 Walkthrough

Walkthrough

The proxy now accepts ticketed persistent-PTY WebSocket upgrades and bridges them to OpenCode. Shared WebSocket utilities handle connection setup, event forwarding, and buffering. Terminal cleanup now traverses directory sessions and removes persistent terminals.

Changes

WebSocket proxy and terminal behavior

Layer / File(s)	Summary
Extend WebSocket bridge lifecycle backend/src/utils/websocket-bridge.ts, backend/test/utils/websocket-bridge.test.ts	The shared bridge adds connection setup and timeout handling, message buffering, initial peer messages, origin validation, and buffer limits. Tests cover bridge lifecycle and failure cases.
Authorize and bridge ticketed PTY connections backend/src/routes/opencode-proxy.ts, backend/src/index.ts, backend/test/routes/opencode-proxy.test.ts	The proxy handles ticketed persistent-PTY upgrades after lifecycle and origin checks. Other requests retain internal-token authentication. Tests cover authorization, rejection cases, and an upstream PTY connection without a client Authorization header.
Use shared WebSocket handling in routes backend/src/routes/repo-terminal-socket.ts, backend/src/services/preview/gateway.ts, backend/src/services/opencode/upstream.ts, backend/test/routes/repo-terminal-socket.test.ts, backend/test/services/preview/gateway-ws.test.ts, backend/test/services/opencode/upstream.test.ts, backend/test/helpers/websocket-server.ts	The repository terminal route and preview gateway use shared WebSocket event wiring. A URL helper converts HTTP(S) URLs to WebSocket URLs. WebSocket tests use a shared server helper.
Remove persistent terminals across sessions backend/src/services/terminal.ts, backend/test/services/terminal.test.ts	removeAll now traverses directory sessions and removes persistent terminals, tolerating 404 responses and propagating other errors. Tests cover pagination and cleanup outcomes.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~45 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant OpenCodeProxy
  participant OpenCode
  Client->>OpenCodeProxy: Request persistent PTY connection with ticket
  OpenCodeProxy->>OpenCode: Connect upstream WebSocket
  OpenCode-->>OpenCodeProxy: Send WebSocket events
  OpenCodeProxy-->>Client: Bridge WebSocket events

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Merge Risk: ⚪ Minimal · up to 958cf

Ticketed remote terminal connections now work through the proxy. Other upgrades keep their existing authentication or 501 behavior, and persistent terminals are cleaned up with their directory. No concrete merge-blocking issue was identified.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 6.25% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 48 functions across 14 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: bridging ticketed PTY WebSocket connections through the proxy for remote terminals.
Description check	✅ Passed	The description follows the required template, explains the bug and implementation, identifies the change type, and completes the checklist with reported validation results.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
Review comments at @backend/src/routes/opencode-proxy.ts:
- Line 119: Bound the client-message queue around bridgeWebSocket while the
upstream WebSocket created from upstreamUrl is connecting, and close the client
socket when the configured limit is reached. Ensure messages cannot accumulate
without a byte limit before upstream ticket validation completes.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Repository UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: f76d9773-e4e8-422c-b64c-6bb82cf824bc

📥 Commits

Reviewing files that changed from the base of the PR and between bf36954 and 98668f6.

📒 Files selected for processing (3)

• backend/src/index.ts
• backend/src/routes/opencode-proxy.ts
• backend/test/routes/opencode-proxy.test.ts

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