Add JWT authentication guard#884
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- Replace src/jwt-auth.guard.ts (was thin AuthGuard('jwt') wrapper) with
full CanActivate implementation:
- Extracts Bearer token from Authorization header
- Verifies signature/expiration via JwtService.verifyAsync
- Checks Redis blacklist: GET blacklist:jti:<jti>
- Attaches decoded payload to req.user
- Structured error responses: missing_token, token_expired,
invalid_token, token_revoked (all 401)
- Optional mode via @OptionalAuth() decorator — passes through
without error for missing/invalid/expired/blacklisted tokens
- Export OptionalAuth decorator for per-route optional auth
- Register JwtAuthGuard + export JwtModule in AuthModule so all
modules using @UseGuards(JwtAuthGuard) get it via DI
Unit tests (10/10):
- valid token → allows + attaches user
- missing Authorization header → 401 missing_token
- expired token → 401 token_expired
- invalid/malformed token → 401 invalid_token
- blacklisted jti → 401 token_revoked
- optional mode: no token, expired, blacklisted → pass through
- optional mode: valid token → attaches user
- performance: <5ms average over 50 iterations
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closes #697
Summary
Implements JWT authentication guard for protecting API routes.
This PR ensures that only authenticated users with valid JWT tokens can access protected endpoints.