feat: add magic link auth provider with code exchange#2649
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Adds a custom OmniAuth provider that delegates authentication to a separate auth app. The auth callback receives a one-time code which is exchanged server-to-server for a JWT, verified against the auth app's JWKS endpoint. State/nonce protects against CSRF; only RS256/ES256 algorithms are accepted.
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Summary
Adds a custom OmniAuth strategy (
:codebar) that delegates authentication to a separate auth app running on port 3001. The auth app becomes an identity provider — users authenticate via magic link or GitHub OAuth on the auth app, which issues a one-time code exchanged server-to-server for a signed JWT.Key Design Decisions
:githuband:codebarproviders coexist — existing auth controller unchanged.Files
lib/omniauth/strategies/codebar.rb— Custom OmniAuth strategy (request_phase, callback_phase, code exchange, JWT verification)config/initializers/omniauth.rb— Added:codebarprovider alongside existing:githubspec/lib/omniauth/strategies/codebar_spec.rb— 16 tests covering all error paths through callback phaseGemfile/Gemfile.lock— AddedjwtgemTesting
484 examples, 0 failures. All existing auth service tests continue to pass. New strategy tests cover state mismatch, missing code, empty code, exchange failure, JWT verification failure, and full success path.