Files
mcp-chassis/go.sum
Mathias 67decddc8a feat: initial mcp-chassis with auth primitives
Shared Go library for Mathias-owned MCP servers, born from spike S3 of
the 2026-05 homelab architecture review (see
gitea.d-ma.be/mathias/infra/docs/superpowers/handoffs/2026-05-22-mcp-chassis-spike.md
for the viability assessment and abort-criterion check).

Provides three primitives every MCP server today re-implements:

- auth.JWTValidator — Dex OIDC JWT validation. nil-safe (nil = "JWT
  disabled"), audience-optional. Lifted from the identical
  ~80-LOC implementations in gitea-mcp and hyperguild/ingestion.
- auth.BearerMiddleware — dual-mode static-Bearer-or-Dex-JWT gate.
  Static wins first to avoid emitting a WWW-Authenticate challenge
  that would flip claude.ai's MCP client into OAuth discovery for
  static-only deployments. The fall-through 401 emits the RFC 9728
  resource_metadata header only when explicitly configured.
- auth.ProtectedResourceHandler — RFC 9728
  /.well-known/oauth-protected-resource metadata document handler.

Test coverage exercises every branch (static OK, JWT-disabled,
empty bearer, wrong static, with-challenge vs without-challenge,
nil-validator-Validate). go test -race clean.

Deps: github.com/lestrrat-go/jwx/v2 (already a dep of every consumer)
and testify (test-only). No new transitive deps.

First migration target: gitea-mcp. If that port lands in one PR
(abort criterion from spec), brain-mcp (ingestion) follows. Otherwise
chassis reverts per the spec.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-22 09:07:53 +02:00

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