Rate limits deletion endpoint, remove insecure fallback logic

[lnovitz]

Pull Request

Description

Rate limits deletion endpoint, remove insecure fallback logic

Related Issue

Fixes #

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• 🎨 Style update (formatting, renaming)
• ♻️ Code refactor (no functional changes)
• ⚡️ Performance improvement
• ✅ Test update
• 🔨 Build configuration update
• 🔒 Security update

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By submitting this pull request, I confirm that my contribution is made under the terms of the project's license.

[gemini-code-assist]

Summary of Changes

Hello @lnovitz, 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 bolstering the application's security posture by introducing rate limiting to a critical deletion endpoint and refining authentication error handling. The changes aim to prevent potential misuse of the API and provide more robust and explicit feedback when user authentication fails.

Highlights

• Security Enhancement: Rate Limiting: Implemented a rate limit of 20 requests per minute on the /delete-email/{email_id} endpoint to prevent abuse and enhance security.
• Authentication Error Handling Improvement: Refactored the get_user_id_and_email function in auth_utils.py to raise a ValueError for invalid or expired authentication tokens, instead of generating and returning a proxy user ID. This ensures clearer error propagation and prevents unintended fallback behavior.

Changelog

• backend/routes/email_routes.py
  • Added a rate limit decorator to the delete_email endpoint.
• backend/utils/auth_utils.py
  • Removed logic for generating proxy user IDs on authentication failure.
  • Modified error handling to raise ValueError when ID tokens are invalid or expired.

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[gemini-code-assist]

Code Review

The pull request successfully implements rate limiting for the email deletion endpoint and refactors the authentication utility to remove insecure fallback logic. However, a NameError was introduced in backend/utils/auth_utils.py because the variable e is referenced in a scope where it is not defined. This will cause the application to crash when handling specific authentication failures. Please address this regression to ensure the authentication flow remains robust.