feat: add GitHub Copilot Provider that support agent mode #7010

[NaccOll]

Related GitHub Issue

Closes: #7010

Description

• Implemented the Copilot component with authentication and model selection features.
• Added tests for the Copilot component covering authentication states, error handling, and model management.
• Updated localization files to include Copilot-related strings in multiple languages.
• Enhanced the model validation functions to support Copilot models.
• Modified the useSelectedModel hook to handle Copilot model selection.
• Updated the index file to export the Copilot component.

VS Code LM API cannot achieve multiple use of the tool consuming only one premium requeusts. Therefore, I implemented a Copilot Provider, mimicking the Copilot authentication process found at https://github.com/BerriAI/litellm and https://github.com/sst/opencode.

In my own test, I chose claude-4 and had him write a web version of Angry Birds. This involved reading and writing eight files, requiring approximately 20 tool calls and consuming only one premium requeust.

Test Procedure

1. Select Copilot as your service provider.
2. Click Copilot Authentication.
3. Copy the device code.
4. Click Open Link.
5. Enter the device code and wait for authentication to complete.
6. Select a model and save.
7. Start the task.

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Screenshots / Videos

Documentation Updates

Additional Notes

Get in Touch

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Important

Add GitHub Copilot Provider with agent mode support, including authentication, model selection, and validation, along with tests and localization updates.

• Behavior:
  • Adds CopilotHandler in copilot.ts to handle GitHub Copilot API interactions, including authentication and model selection.
  • Updates webviewMessageHandler.ts to handle Copilot authentication and model requests.
  • Supports model validation for Copilot in validate.ts.
• Tests:
  • Adds tests for CopilotHandler in copilot.spec.ts.
  • Adds tests for Copilot authentication and model fetching in copilot.test.ts.
  • Updates validate.test.ts to include Copilot model validation.
• Localization:
  • Updates localization files to include Copilot-related strings in multiple languages.
• UI:
  • Adds Copilot component in Copilot.tsx for UI interactions related to Copilot authentication and model selection.

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[roomote]

Thank you for your contribution! I've reviewed the GitHub Copilot Provider implementation and found it to be well-structured overall. The OAuth device flow authentication is properly implemented, and the TypeScript typing is comprehensive. However, there are some issues that need attention before merging.

[roomote]

Is this X-Initiator logic correct? The method seems complex and the logic for determining 'agent' vs 'user' might not cover all edge cases. Could you add more comments explaining the rationale, or consider simplifying this?

[NaccOll]

Yeah. This method is mainly used to determine whether the last request was sent by the user. However, there is currently no such flag, which can only determine whether the text in the message has the specified tag.

[roomote]

Security concern: Tokens are stored in plaintext at ~/.roo-code/copilot/tokens.json. Have you considered using VSCode's secret storage API instead for better security?

Example:

await context.secrets.store('copilot_access_token', accessToken)

[NaccOll]

Yes, this is no different from other apiKeys. And it is difficult to get the context in a singleton object

[daniel-lxs]

Thank you @NaccOll. This looks good. My main concern is the TOS that we might be breaking by pretending we are Copilot:

After the review comments are addressed, I will approve it and let the team decide if we should merge this.

[daniel-lxs]

@NaccOll Thank you for addressing the review, it seems that a unit test is failing, can you take a look?

[NaccOll]

@daniel-lxs fixed unit test

[NaccOll]

@daniel-lxs

How do I resolve this latest conflict: Types of property 'apiProvider' are incompatible.

@roo-code/cloud restricts adding providers.

[daniel-lxs]

Hey @NaccOll, Thank you for the contribution. After discussing it with the team, we decided to close this PR. We prefer not to bypass restrictions by using the Copilot User Agent.

Let me know if you have any questions!

[NaccOll]

@daniel-lxs I think the issue should be closed as the VSCode LM API does not provide this functionality. It is unique to copilot and relies on a hack with a specific http header.

[hannesrudolph]

I have just sent a message to a Senior Developer Advocate at GitHub. Maybe we can merge this...

[NaccOll]

I have just sent a message to a Senior Developer Advocate at GitHub. Maybe we can merge this...

If there's any progress, please let me know so I can make changes.

Copilot's documentation does allow third-party agents to access this. They might ban pretend copilots and instead require RooCode to register an Github app and grant permissions for the app.

I've tried this myself, but when I tried to access the final API key, I got a message saying I didn't have the required permissions, so I gave up.

[snoyiatk]

I think GH Copilot allow tools call response to be agent and not count toward premium requests.
This PR only apply the header to tool call result request, all users messages are still user input so I think it's acceptable.

[dyaminigo]

@daniel-lxs Any updates on this issue? Unfortunately, it's impossible to effectively use GitHub Copilot models with Roo-Code as premium requests are consumed too quickly.