Fix OAuth authentication: Add missing redirect_uri parameter

[ishaileshpant]

🔧 Fix OAuth Authentication Issue

Problem

Users were experiencing "Authentication Failed" errors with the message "The code passed is incorrect or expired" when trying to authenticate with GitHub OAuth.

Root Cause

The OAuth authorization request was missing the redirect_uri parameter, which GitHub requires to match exactly what's configured in the OAuth app settings.

Solution

• ✅ Added redirect_uri parameter to the GitHub OAuth authorization URL
• ✅ Improved error handling for expired OAuth codes with specific user-friendly messaging
• ✅ Enhanced logging for better OAuth debugging and troubleshooting

Changes Made

1. Modified github-auth.js:
   • Added redirect_uri parameter to OAuth authorization URL
   • Improved error handling for "incorrect or expired" codes
   • Added comprehensive logging for debugging

Technical Details

// Before
const authUrl = `https://github.com/login/oauth/authorize?` +
    `client_id=${this.clientId}&` +
    `scope=${this.scope}&` +
    `state=${this.generateState()}`;

// After  
const redirectUri = this.getCallbackUri();
const authUrl = `https://github.com/login/oauth/authorize?` +
    `client_id=${this.clientId}&` +
    `scope=${this.scope}&` +
    `state=${this.generateState()}&` +
    `redirect_uri=${encodeURIComponent(redirectUri)}`;

Testing

• OAuth flow now includes proper redirect_uri parameter
• Error handling provides clear feedback for expired codes
• Enhanced logging helps with debugging OAuth issues

Impact

• 🎯 Resolves "The code passed is incorrect or expired" error
• 🚀 Improves user experience with better error messages
• 🔍 Enhances debugging capabilities for OAuth issues

Closes: OAuth authentication failures

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
prepguides-dev	Ready	Preview	Comment	Oct 8, 2025 6:24pm

[ishaileshpant]

/approve

[github-actions]

🚀 Admin-Approved and Auto-Merged!

This PR has been automatically merged to main after admin approval by @ishaileshpant.

✅ **Status**: Merged and deployed
🔗 **Commit**: `9754d7db8d182ef5cdbf28745911a2d5a1b6f056`
📅 **Merged at**: 2025-10-08T18:29:03.964Z
👤 **Approved by**: Admin/Maintainer/Owner

Thank you for your contribution! 🎉