refactor for firebase improvements #5
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WalkthroughThe FirebaseAuthService class in app/auth/firebase_auth.py was updated to enhance logging, error handling, and credential initialization flexibility. A new asynchronous method for refreshing access tokens using refresh JWT tokens was added. Token verification and user creation now handle errors more robustly, and the code structure was clarified. Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant FirebaseAuthService
participant FirebaseAdminSDK
Client->>FirebaseAuthService: Call refresh_access_token(refresh_token)
FirebaseAuthService->>FirebaseAdminSDK: Verify refresh_token (JWT)
alt Valid refresh token
FirebaseAuthService->>FirebaseAdminSDK: Fetch user by UID
FirebaseAuthService->>FirebaseAdminSDK: Generate new access token
FirebaseAuthService-->>Client: Return new access token
else Invalid token or error
FirebaseAuthService-->>Client: Return None
end
Poem
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Summary of Changes
Hello @arvi18, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request focuses on refactoring the Firebase authentication service to improve its robustness, observability, and clarity. The changes primarily involve enhancing error handling, integrating a structured logging system, and refining user management operations within the FirebaseAuthService class.
Highlights
- Enhanced Logging and Error Handling: I've integrated Python's standard
loggingmodule across theFirebaseAuthServiceto replace directprintstatements. This provides more structured and configurable logging for Firebase initialization, user creation, sign-in, and token verification/refresh operations. Additionally, I've introduced more specific exception types likeRuntimeError,PermissionError, andValueErrorfor clearer error propagation. - Improved Firebase SDK Initialization: The
_initialize_firebasemethod now includes explicit logging for successful initialization and raises aRuntimeErrorwith proper exception chaining if initialization fails, making it easier to diagnose setup issues. - User Management Robustness and Clarity: The
create_usermethod now returns thecreated_attimestamp as a string, which is more suitable for serialization. Forsign_in_user, I've updated the docstring to clarify that it simulates authentication via the Admin SDK and that password verification should ideally use the Firebase Auth REST API in production. Bothverify_tokenandsign_in_usernow robustly handle custom claims by ensuring they default to an empty dictionary if no claims are present. - Code Structure and Readability: Minor refactorings include reordering imports for consistency, moving the
refresh_access_tokenmethod for better logical flow, and updating comments (e.g., clarifyingfirebase_authas a 'Singleton instance').
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Actionable comments posted: 0
🔭 Outside diff range comments (1)
app/auth/firebase_auth.py (1)
69-98: Implement Firebase Auth REST API for Password VerificationNo existing integration for production password checks was found in the codebase—sign_in_user still only simulates authentication. Please add or outline a proper REST-based sign-in flow:
• File: app/auth/firebase_auth.py (around lines 69–98)
• Action: Implement a helper (e.g._verify_password_via_rest) that calls Firebase Auth’s REST endpoints to validate credentials, or at minimum add a clear TODO with a link to Firebase REST docs.
• Ensure error handling/logging aligns with the simulated flow.
🧹 Nitpick comments (1)
app/auth/firebase_auth.py (1)
118-131: Well-implemented refresh token functionality with proper validation.The new
refresh_access_tokenmethod correctly validates the refresh token type and handles errors gracefully. However, consider adding expiry validation before proceeding with user lookup for better performance.async def refresh_access_token(self, refresh_token: str) -> Optional[str]: """Issue new access token if refresh token is valid.""" try: payload = jwt.decode(refresh_token, self.jwt_secret, algorithms=[self.jwt_algorithm]) if payload.get("type") != "refresh": raise ValueError("Invalid token type for refresh") + + # Check if token is expired + if payload.get("exp", 0) < datetime.utcnow().timestamp(): + raise ValueError("Refresh token expired") user_id = payload.get("user_id") user_record = auth.get_user(user_id)
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📒 Files selected for processing (1)
app/auth/firebase_auth.py(4 hunks)
🧰 Additional context used
🧬 Code Graph Analysis (1)
app/auth/firebase_auth.py (1)
app/auth/routes.py (2)
refresh_token(76-97)verify_token(124-135)
🔇 Additional comments (6)
app/auth/firebase_auth.py (6)
3-12: Good logging setup and import improvements.The addition of logging configuration and proper type hints enhances code maintainability and debugging capabilities.
24-40: Excellent Firebase initialization flexibility with robust error handling.The enhanced initialization method now supports multiple credential sources with proper error handling and logging. The use of
RuntimeErrorwith chained exceptions provides clear error context.
42-67: Improved user creation with better error handling.The user creation method now has proper error logging and raises
RuntimeErrorinstead of generic exceptions. The timestamp conversion to string is a good practice for serialization.
100-116: Better token verification with graceful error handling.The change to return
Noneinstead of raising exceptions on token verification failure is appropriate for this use case, allowing callers to handle invalid tokens gracefully.
133-150: Token generation methods maintain consistency.The token generation methods are well-structured with proper expiry handling and type identification.
153-154: Clear singleton instance documentation.The updated comment clearly identifies this as a singleton instance.
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Code Review
This pull request refactors the FirebaseAuthService to introduce structured logging and improve exception handling. Key changes include using more specific exception types and reorganizing the code for better clarity. The changes are generally positive, but there are a few areas for improvement:
- The logging configuration should be moved to the application entry point.
- The format of the
created_attimestamp should be standardized. - Error messages for user creation could be more specific.
- Some docstrings were removed and should be restored.
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
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| password=password, | ||
| display_name=f"{first_name} {last_name}", | ||
| email_verified=False | ||
| ) |
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Security Issue: The sign_in_user method simulates authentication without actual password verification, which creates a significant security vulnerability. This could lead to authentication bypass and unauthorized access.
Recommendation: Implement proper authentication using Firebase Auth REST API with secure credential validation instead of simulation.
| "email": user_record.email, | ||
| "first_name": custom_claims.get("first_name", ""), | ||
| "last_name": custom_claims.get("last_name", ""), | ||
| "role": custom_claims.get("role", "user") |
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Security Issue: Token verification returns None on failure instead of raising an appropriate exception. This silent failure pattern could lead to authentication bypass if callers don't explicitly check for None returns.
Recommendation: Raise specific authentication exceptions with clear error messages rather than returning None.
| "last_name": custom_claims.get("last_name", ""), | ||
| "is_active": not user_record.disabled, | ||
| "created_at": str(user_record.user_metadata.creation_timestamp) | ||
| } |
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Error Handling Issue: Using generic RuntimeError for authentication failures reduces API clarity and may expose unnecessary system details to clients.
Recommendation: Create and use specific authentication-related exceptions that provide clear, user-friendly error messages without exposing implementation details.
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PR already reviewed at the latest commit: 5116d71. |
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PR already reviewed at the latest commit: 5116d71. |
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Summary by CodeRabbit
New Features
Improvements