Python Copilot Proxy Server Implementation | Generated by AI

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This Python script is a local proxy server that interacts with GitHub Copilot to generate code completions. It mimics the behavior of the official GitHub Copilot plugin (e.g., for Neovim) by handling authentication and forwarding requests to Copilot’s API.

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Key Components & Workflow

1. Authentication (setup() and get_token())
   • Uses OAuth Device Flow to authenticate with GitHub.
   • Requests a device code and user code from GitHub.
   • Asks the user to visit a URL (verification_uri) and enter the user_code.
   • Polls GitHub until an access token is received.
   • Saves the token to .copilot_token for future use.
   • Exchanges the access token for a Copilot session token (required for API calls).
2. Token Refresh (token_thread())
   • Runs in a background thread.
   • Refreshes the Copilot token every 25 minutes (since tokens expire).
3. Copilot API Interaction (copilot())
   • Sends a prompt (code snippet) to Copilot’s API.
   • Returns generated completions in streaming mode (line-by-line).
   • Handles errors (e.g., invalid/expired tokens).
4. HTTP Server (HTTPRequestHandler)
   • Listens for POST requests (e.g., from a local editor).
   • Extracts the prompt and language from the request.
   • Calls copilot() and returns the completion as plain text.
5. Main Function (main())
   • Starts the token refresh thread.
   • Launches an HTTP server on a specified port (default: 8080).

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How It Works Step-by-Step

1. First Run (No Token)
   • The script calls setup() to authenticate via OAuth.
   • The user visits GitHub, enters a code, and grants access.
   • The script saves the access token to .copilot_token.
2. Subsequent Runs (Token Exists)
   • The script reads .copilot_token and fetches a Copilot session token.
   • If the token expires, it refreshes automatically.
3. Handling Requests
   • A local editor (e.g., Neovim) sends a POST request with a code snippet.
   • The script forwards the prompt to Copilot’s API.
   • The completion is returned to the editor.
4. Token Management
   • A background thread refreshes the token every 25 minutes to avoid expiration.

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Why This Exists

• Bypasses Official Plugins: Some editors (e.g., Neovim) lack official Copilot support. This script acts as a bridge.
• Local Proxy: Avoids rate limits by managing tokens locally.
• Customization: Can be modified to work with different editors or APIs.

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Security & Ethical Considerations

• Hardcoded Client ID: The script uses GitHub Copilot’s official client_id (Iv1.b507a08c87ecfe98), which may violate GitHub’s ToS if used outside approved plugins.
• Token Storage: The access token is stored in plaintext (.copilot_token), which is a security risk.
• Rate Limits: Frequent requests may trigger GitHub’s abuse detection.

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How to Use

1. Run the script:

   python copilot_proxy.py [PORT]
   

   (Default port: 8080)

2. Configure your editor to send requests to http://localhost:8080 with a JSON payload like:

   {
     "prompt": "def hello_world():",
     "language": "python"
   }
   

3. The script will return Copilot’s completion.

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Potential Improvements

• Better Error Handling: Retry failed requests, handle network issues.
• Secure Token Storage: Use encrypted storage or environment variables.
• Configuration File: Allow customizing client_id, port, etc.
• Logging: Add debug logs for troubleshooting.

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Alternatives

• Use official Copilot plugins (VS Code, JetBrains, etc.).
• Try open-source alternatives like Codeium or Tabby.

This script is a clever workaround but should be used cautiously due to potential ToS violations.

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