feat(auth): migrate to Keycloak metadata auth

app/auth/keycloak_dependencies.py

@@ -8,35 +8,41 @@ from jose import JWTError, jwt
 from app.core.config import settings
 
 oauth2_optional = OAuth2PasswordBearer(
-    tokenUrl=f"{settings.API_V1_STR}/auth/login", auto_error=False
+    tokenUrl="keycloak", auto_error=False
 )
 
 # logger = logging.getLogger(__name__)
 
 
-async def get_current_keycloak_sub(
+def _decode_keycloak_token(token: str) -> dict:
+    if not settings.KEYCLOAK_PUBLIC_KEY:
+        raise HTTPException(
+            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
+            detail="Keycloak public key is not configured",
+        )
+
+    key = settings.KEYCLOAK_PUBLIC_KEY.replace("\\n", "\n")
+
+    return jwt.decode(
+        token,
+        key,
+        algorithms=[settings.KEYCLOAK_ALGORITHM],
+        audience=settings.KEYCLOAK_AUDIENCE or None,
+    )
+
+
+async def get_current_keycloak_payload(
     token: str | None = Depends(oauth2_optional),
-) -> UUID:
+) -> dict:
     if not token:
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
             detail="Not authenticated",
             headers={"WWW-Authenticate": "Bearer"},
         )
-    if settings.KEYCLOAK_PUBLIC_KEY:
-        key = settings.KEYCLOAK_PUBLIC_KEY.replace("\\n", "\n")
-        algorithms = [settings.KEYCLOAK_ALGORITHM]
-    else:
-        key = settings.SECRET_KEY
-        algorithms = [settings.ALGORITHM]
 
     try:
-        payload = jwt.decode(
-            token,
-            key,
-            algorithms=algorithms,
-            audience=settings.KEYCLOAK_AUDIENCE or None,
-        )
+        return _decode_keycloak_token(token)
     except JWTError as exc:
         # logger.warning("Keycloak token validation failed: %s", exc)
         raise HTTPException(
@@ -45,6 +51,10 @@ async def get_current_keycloak_sub(
             headers={"WWW-Authenticate": "Bearer"},
         ) from exc
 
+
+async def get_current_keycloak_sub(
+    payload: dict = Depends(get_current_keycloak_payload),
+) -> UUID:
     sub = payload.get("sub")
     if not sub:
         raise HTTPException(
@@ -64,35 +74,8 @@ async def get_current_keycloak_sub(
 
 
 async def get_current_keycloak_username(
-    token: str | None = Depends(oauth2_optional),
+    payload: dict = Depends(get_current_keycloak_payload),
 ) -> str:
-    if not token:
-        raise HTTPException(
-            status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="Not authenticated",
-            headers={"WWW-Authenticate": "Bearer"},
-        )
-    if settings.KEYCLOAK_PUBLIC_KEY:
-        key = settings.KEYCLOAK_PUBLIC_KEY.replace("\\n", "\n")
-        algorithms = [settings.KEYCLOAK_ALGORITHM]
-    else:
-        key = settings.SECRET_KEY
-        algorithms = [settings.ALGORITHM]
-
-    try:
-        payload = jwt.decode(
-            token,
-            key,
-            algorithms=algorithms,
-            audience=settings.KEYCLOAK_AUDIENCE or None,
-        )
-    except JWTError as exc:
-        raise HTTPException(
-            status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="Invalid token",
-            headers={"WWW-Authenticate": "Bearer"},
-        ) from exc
-
     username = payload.get("preferred_username") or payload.get("username")
     if not username:
         raise HTTPException(