Fix GitHub App configuration detection and dynamic installation ID lookup

[ishaileshpant]

🔧 Fix GitHub App Configuration Detection

Problem

The bot API was failing with "FUNCTION_INVOCATION_FAILED" error because it required GITHUB_APP_INSTALLATION_ID as an environment variable, but the GitHub App is installed and configured in Vercel.

Root Cause

The bot API was checking for GITHUB_APP_INSTALLATION_ID as a required environment variable, but GitHub Apps can dynamically find their installation ID using the GitHub API.

Solution

• ✅ Removed requirement for GITHUB_APP_INSTALLATION_ID environment variable
• ✅ Added dynamic installation ID lookup for prepguides organization
• ✅ Improved GitHub App initialization with better error handling
• ✅ Maintains backward compatibility with explicit installation ID if provided

Technical Changes

// Before - required GITHUB_APP_INSTALLATION_ID env var
if (!process.env.GITHUB_APP_ID || !process.env.GITHUB_APP_PRIVATE_KEY || !process.env.GITHUB_APP_INSTALLATION_ID) {
    return res.status(503).json({ error: 'GitHub App not configured' });
}

// After - dynamically finds installation ID
if (!process.env.GITHUB_APP_ID || !process.env.GITHUB_APP_PRIVATE_KEY) {
    return res.status(503).json({ error: 'GitHub App not configured' });
}

// Dynamic installation ID lookup
const installations = await tempOctokit.apps.listInstallations();
const targetInstallation = installations.data.find(installation => 
    installation.account.login === 'prepguides'
);

How It Works

1. Creates app auth with just App ID and Private Key
2. Gets app token to access GitHub API
3. Lists installations to find the prepguides organization
4. Uses found installation ID to create authenticated Octokit instance
5. Creates PRs directly on origin repository using bot account

Files Changed

• api/github/create-content-pr.js - Fixed GitHub App configuration detection and initialization

Impact

• 🎯 Resolves FUNCTION_INVOCATION_FAILED error
• 🚀 Enables bot API to work with existing GitHub App configuration
• 🛡️ Uses bot account to create PRs directly on origin repository
• 🔄 Maintains backward compatibility with explicit installation ID

Testing

• GitHub App configuration detection now works properly
• Dynamic installation ID lookup implemented
• Bot API can create PRs using bot account
• No linting errors

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
prepguides-dev	Ready	Preview	Comment	Oct 8, 2025 6:52pm

[ishaileshpant]

Closing this PR as it's no longer needed. PR #118 was merged which includes the fallback mechanism, making this GitHub App configuration fix unnecessary.