Fix private repository access handling

[abhishek-anand]

Summary

• Improved error handling for private repository access failures with specific error messages
• Added GitHub Personal Access Token support for private repository access
• Enhanced user experience with contextual token input that appears only when needed

Test plan

• Test public repository access (should work as before)
• Test private repository access without token (should show clear error message)
• Test private repository access with valid token (should work)
• Verify token input only appears when private repo error occurs
• Confirm token is not stored and used only for current request

Changes Made

Backend

• Enhanced GitHub API error handling with specific messages for 403/404 responses
• Added user token parameter to GitHubService constructor
• Updated API request models to accept github_token field
• Modified service instantiation to use user tokens when provided

Frontend

• Added contextual GitHub token input that appears only after private repo errors
• Included helpful documentation link for token creation
• Used password input type for security
• Added clear messaging about token usage and storage

[gemini-code-assist]

Summary of Changes

Hello @abhishek-anand, 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 introduces significant enhancements to how the application interacts with GitHub repositories, particularly private ones. The primary goal is to enable users to access their private repositories by providing a GitHub Personal Access Token, while also greatly improving the clarity and specificity of error messages when repository access fails due to permissions or non-existence. This makes the application more robust and user-friendly for private repository workflows.

Highlights

• Private Repository Access: Implemented support for GitHub Personal Access Tokens (PATs) to allow users to access private repositories, enhancing the application's utility for a wider range of GitHub projects.
• Enhanced Error Handling: Improved error handling for GitHub API calls, providing more specific and user-friendly messages for 403 (Forbidden) and 404 (Not Found) responses, guiding users on how to resolve access issues.
• Backend Integration: Modified API request models (ApiRequest, SlideRequest) to accept a github_token and updated the get_cached_github_data function to dynamically instantiate GitHubService with the provided token, ensuring secure and authenticated access.
• GitHub Service Refinement: The GitHubService now prioritizes user-provided tokens for authentication and includes more robust error propagation for various GitHub API interactions (e.g., fetching default branch, file tree, README, or file content).

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[abhishek-anand]

#2

[gemini-code-assist]

Code Review

This pull request enhances the application by adding support for private repositories and improving error handling. The changes are well-structured and the intent is clear. The review focuses on improving API error handling and reducing code duplication to enhance maintainability.