feat(fastmcp,mcp): expose fail_closed through the adapter auth factories - #21
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The core SDK already implements fail_closed on AuthplaneClient.resource(...), but neither authplane_auth() nor authplane_mcp_auth() forwarded it, so factory users opting into revocation checking were locked into fail-open behavior on introspection/revocation-check outages. Both factories now accept fail_closed: bool = False and pass it through at the client.resource(...) boundary. The default preserves today's fail-open behavior. Also adds the previously missing core coverage for fail_closed=True (crashing custom checker and introspection HTTP 500 both reject with TokenRevokedError), forwarding tests for both adapters, and user-guide docs covering the availability/security trade-off, the authenticated-introspection credential requirement, and the circuit-breaker interaction. Requested in #20.
ruff 0.16.0 started formatting Python code blocks inside Markdown files, so CI (which installs the latest ruff satisfying >=0.8) rejects the previously formatted docs. Blank-line normalization only, no content changes.
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…ases - AuthplaneClient.resource() logs a warning when fail_closed=True is combined with revocation_checker=None. The flag is a security-relevant no-op in that combination, and the misconfiguration should be observable in production, not only documented. The warning lives in the core factory rather than the adapters so direct resource() users get it too. - New core tests pin two fail-closed failure modes that were emergent: AS metadata without introspection_endpoint rejects every token (permanently, since it is a configuration property rather than an outage), and an open circuit breaker rejects all traffic without further HTTP calls (TokenRevokedError with CircuitOpenError as cause). - Both user guides gain the metadata trade-off bullet and note the new warning.
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muralx
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Thanks, please pin ruff version so we avoid formatting changes from happening during feature development and bug fixes.
| ## [Unreleased] | ||
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| ### Added | ||
| - `authplane-fastmcp`, `authplane-mcp`: `authplane_auth()` and `authplane_mcp_auth()` accept `fail_closed: bool = False` and forward it to `AuthplaneClient.resource(...)`, so factory users can opt into rejecting tokens (`TokenRevokedError`) when the configured `revocation_checker` itself fails — e.g. an unreachable introspection endpoint — instead of the default fail-open acceptance. The flag is only consulted when a `revocation_checker` is configured; `AuthplaneClient.resource(...)` now logs a warning when `fail_closed=True` is set without one, since that combination runs no revocation check at all. Both user guides document the availability/security trade-off, the authenticated-introspection credential requirement, the circuit-breaker interaction, and the permanent rejection that results from AS metadata lacking `introspection_endpoint`. |
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Keep changelog short, documentation is in the code, and in the Issue.
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Closes #20.
What
Both adapter factories —
authplane_fastmcp.authplane_auth()andauthplane_mcp.authplane_mcp_auth()— now acceptfail_closed: bool = Falseand forward it toAuthplaneClient.resource(...). The core SDK already implementedfail_closed; the factories simply never exposed it, so integrations opting intoIntrospectionRevocation()were locked into fail-open behavior on introspection/revocation-check outages unless they abandoned the one-call factory and wired the resource manually.authplane-mcphad the same gap asauthplane-fastmcp, so both factories are covered in this PR to keep them in parity with the core API.Changes
fail_closed: bool = Falsekeyword on both factories, forwarded at theclient.resource(...)boundary. Default preserves today's fail-open behavior; fully backward compatible.fail_closed=True(previously untested): a crashing custom checker and an introspection HTTP 500 both reject withTokenRevokedError.False, explicitTrue).revocation_checker.Testing
pytest tests(core): 522 passedpytest testsinauthplane-fastmcp: 55 passedpytest testsinauthplane-mcp: 55 passedruff check/ruff format --check: cleanpyright: 0 errors