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Ole-Morten Duesund 006d5c1448 feat(forgejo): upstream OAuth client (forgejo-mcp-broker-b9i) 
Adds internal/forgejo: a stateless OAuth 2.1 client for upstream Forgejo.
Covers what the broker AS needs:
  - AuthorizeURL: builds the user-agent redirect to /login/oauth/authorize
  - ExchangeCode: code → access+refresh tokens (PKCE verifier included)
  - Refresh: refresh_token grant (Forgejo rotates the refresh token)
  - FetchUserInfo: OIDC userinfo claims (sub, preferred_username, etc.)

OAuth errors come back as a structured *forgejo.Error so the AS can
distinguish "user must re-authenticate" (invalid_grant) from "transient
network problem" via errors.As. Forgejo doesn't currently expose a token
revocation endpoint, so revocation lives in the broker's own store —
upstream tokens expire naturally.

Defaults:
  - 30s HTTP timeout (Forgejo OAuth is sub-second when healthy)
  - User-Agent "fjmcp-broker" if not overridden
  - 64 KiB cap on response bodies (these endpoints return ~kilobytes)

Tests: 95.1% coverage. httptest.Server fake Forgejo exercises every
public method, every error shape (OAuth-formatted, plain {"message":...},
malformed JSON, missing required fields, network failure), and verifies
form params hit the wire as expected.

Closes forgejo-mcp-broker-b9i.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-27 13:31:19 +02:00
.beads feat(forgejo): upstream OAuth client (forgejo-mcp-broker-b9i) 2026-04-27 13:31:19 +02:00
.claude bd init: initialize beads issue tracking 2026-04-24 16:34:50 +02:00
cmd/broker feat(cmd/broker): wire config → log → store → httpserver (forgejo-mcp-broker-t37) 2026-04-24 17:29:37 +02:00
docs docs: initial planning artifacts for fjmcp-broker 2026-04-24 16:21:01 +02:00
internal feat(forgejo): upstream OAuth client (forgejo-mcp-broker-b9i) 2026-04-27 13:31:19 +02:00
.gitignore bd init: initialize beads issue tracking 2026-04-24 16:34:50 +02:00
AGENTS.md bd init: initialize beads issue tracking 2026-04-24 16:34:50 +02:00
CLAUDE.md docs: fill CLAUDE.md with phase-1 session learnings 2026-04-24 17:37:36 +02:00
go.mod feat(store): SQLite with embedded migrations (forgejo-mcp-broker-9jh) 2026-04-24 17:22:47 +02:00
go.sum feat(store): SQLite with embedded migrations (forgejo-mcp-broker-9jh) 2026-04-24 17:22:47 +02:00
LICENSE bd init: initialize beads issue tracking 2026-04-24 16:34:50 +02:00
Makefile feat: bootstrap Go project layout (forgejo-mcp-broker-n84) 2026-04-24 16:54:27 +02:00
README.md bd init: initialize beads issue tracking 2026-04-24 16:34:50 +02:00

README.md

forgejo-mcp-broker

OAuth 2.1 authorization server and MCP session broker for forgejo-mcp.

Lets MCP clients such as Claude.ai connect to a Forgejo instance through a single public HTTPS endpoint, with per-user authentication delegated to Forgejo's own OAuth2 provider. The broker handles the OAuth dance, then spawns a dedicated forgejo-mcp --transport stdio subprocess for each authenticated session, scoped to the authenticated user's Forgejo access token.

Status: Planning. No code yet. See docs/design.md for the architecture and docs/plan.md for the phased implementation plan.

How it fits

Claude.ai ──HTTPS──▶ Caddy ──▶ fjmcp-broker ──stdio──▶ forgejo-mcp  ──▶ Forgejo API
                                  (this)              (one per user     (per-user
                                                       session)          token)
  • fjmcp-broker (this project): one long-running process. Handles OAuth discovery, dynamic client registration, the authorization-code flow against Forgejo, session lifecycle, and stdio-to-streamable-HTTP bridging.
  • forgejo-mcp (existing project): used as-is. Spawned per-session with the authenticated user's FORGEJO_ACCESS_TOKEN in the environment.
  • Caddy: terminates TLS for the public hostname and reverse-proxies to the broker.

Why a broker instead of adding OAuth to forgejo-mcp?

Process-level isolation. Each user's Forgejo token lives in exactly one subprocess — the broker never needs to demultiplex tokens inside a single shared client. This keeps forgejo-mcp's sync.Once singleton-client pattern valid and avoids a refactor of every tool handler. Full trade-off in docs/design.md.

Quick map

File What
docs/design.md Architecture, components, token flow, deployment, security
docs/plan.md Seven-phase implementation plan with acceptance criteria

License

MIT © 2026 Ole-Morten Duesund.