ConduitMcp.OAuth.KeyProvider.JWKS (ConduitMCP v0.9.6)

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JWKS key provider that fetches keys from an HTTP endpoint with ETS caching.

Fetches JSON Web Key Sets from the authorization server's JWKS URI, caches them in ETS, and auto-refreshes on cache miss or expiration.

Configuration

auth: [
  strategy: :oauth,
  key_provider: {ConduitMcp.OAuth.KeyProvider.JWKS,
    jwks_uri: "https://auth.example.com/.well-known/jwks.json",
    cache_ttl: :timer.hours(1)}    # default: 1 hour
]

The jwks_uri must use https. For local development against a plain-HTTP authorization server, set allow_insecure_jwks: true in the provider config.

Fetches use conservative HTTP settings: redirects are not followed, requests time out (5s connect / 10s receive), and responses are capped at 1MB. If a refresh fails and previously fetched keys are still cached, those stale keys are served (with a logged warning) so a transient authorization-server outage does not hard-fail all authentication — bounded by :stale_max_age (default 24 hours), after which the provider fails closed so revoked keys cannot validate tokens indefinitely.

Requirements

Requires the req package:

{:req, "~> 0.5"}