feat(auth): move JWT blacklist to Redis with TTL [FASE-0.2]

Revoke tokens by jti in a dedicated Redis DB, honor TTL from JWT exp on logout, reject revoked tokens in get_current_user, and add FakeRedis-backed API tests.

backend/app/auth.py

@@ -80,11 +80,11 @@ def blacklist_token(jti: str, exp: float) -> None:
     to ``exp - now`` so the key vanishes when the token would have expired
     naturally.
     """
-    from app.infrastructure.redis_client import get_redis
+    from app.infrastructure.redis_client import get_redis_blacklist
 
     ttl = max(int(exp - datetime.now(timezone.utc).timestamp()), 1)
     try:
-        r = get_redis()
+        r = get_redis_blacklist()
         r.setex(f"{_BLACKLIST_PREFIX}{jti}", ttl, "1")
     except Exception:
         logger.warning("Failed to blacklist token %s in Redis", jti, exc_info=True)
@@ -92,10 +92,10 @@ def blacklist_token(jti: str, exp: float) -> None:
 
 def is_token_blacklisted(jti: str) -> bool:
     """Return ``True`` if *jti* has been revoked (exists in Redis)."""
-    from app.infrastructure.redis_client import get_redis
+    from app.infrastructure.redis_client import get_redis_blacklist
 
     try:
-        r = get_redis()
+        r = get_redis_blacklist()
         return r.exists(f"{_BLACKLIST_PREFIX}{jti}") > 0
     except Exception:
         logger.warning("Failed to check blacklist for %s in Redis", jti, exc_info=True)

backend/app/dependencies/auth.py

@@ -15,7 +15,7 @@ from fastapi.security import OAuth2PasswordBearer
 from jose import JWTError, jwt
 from sqlalchemy.orm import Session
 
-from app.auth import is_token_blacklisted
+from app import auth as auth_lib
 from app.config import settings
 from app.database import get_db
 from app.models.user import User
@@ -57,6 +57,11 @@ async def get_current_user(
         detail="Could not validate credentials",
         headers={"WWW-Authenticate": "Bearer"},
     )
+    revoked_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Token has been revoked",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
 
     # Prefer cookie, fall back to header
     token = aegis_token or bearer_token
@@ -74,8 +79,8 @@ async def get_current_user(
             raise credentials_exception
         # Check token blacklist (revoked tokens)
         jti: str | None = payload.get("jti")
-        if jti and is_token_blacklisted(jti):
-            raise credentials_exception
+        if jti and auth_lib.is_token_blacklisted(jti):
+            raise revoked_exception
     except JWTError:
         raise credentials_exception
 

backend/app/routers/auth.py

@@ -96,13 +96,26 @@ def logout(
     The token's ``jti`` is added to the Redis blacklist so it cannot
     be reused even if the cookie has already been copied elsewhere.
     The blacklist entry auto-expires when the token's ``exp`` is reached.
+
+    When both HttpOnly cookie and ``Authorization: Bearer`` are present
+    (typical for API clients), **both** are revoked so the session cannot
+    survive on whichever credential the next request prefers.
     """
-    # Attempt to blacklist the token's jti
-    token = aegis_token or request.headers.get("Authorization", "").removeprefix("Bearer ").strip()
-    if token:
+    bearer = (
+        request.headers.get("Authorization")
+        or request.headers.get("authorization")
+        or ""
+    )
+    bearer = bearer.removeprefix("Bearer ").removeprefix("bearer ").strip()
+
+    seen: set[str] = set()
+    for raw in (aegis_token, bearer):
+        if not raw or raw in seen:
+            continue
+        seen.add(raw)
         try:
             payload = jwt.decode(
-                token,
+                raw,
                 settings.SECRET_KEY,
                 algorithms=[settings.ALGORITHM],
             )
@@ -111,7 +124,7 @@ def logout(
             if jti:
                 blacklist_token(jti, float(exp))
         except JWTError:
-            pass  # token already invalid — nothing to revoke
+            pass  # token already invalid — nothing to revoke for this raw value
 
     response.delete_cookie(
         key=_COOKIE_NAME,