feat: Add GitHub Copilot integration with authentication and model management

- Implemented the Copilot component with authentication flow, including device code handling and error management.
- Added tests for the Copilot component to ensure proper functionality and user experience during authentication and model selection.
- Updated localization files to include Copilot-related strings in multiple languages.
- Enhanced model selection logic to support Copilot models.
- Updated validation functions to accommodate Copilot model IDs.
- Exported the Copilot component from the providers index for accessibility.

Author: NaccOll

packages/types/src/provider-settings.ts

@@ -47,6 +47,7 @@ export const providerNames = [
 	"zai",
 	"fireworks",
 	"io-intelligence",
+	"copilot",
 ] as const
 
 export const providerNamesSchema = z.enum(providerNames)
@@ -288,6 +289,10 @@ const ioIntelligenceSchema = apiModelIdProviderModelSchema.extend({
 	ioIntelligenceApiKey: z.string().optional(),
 })
 
+const copilotSchema = baseProviderSettingsSchema.extend({
+	copilotModelId: z.string().optional(),
+})
+
 const defaultSchema = z.object({
 	apiProvider: z.undefined(),
 })
@@ -324,6 +329,7 @@ export const providerSettingsSchemaDiscriminated = z.discriminatedUnion("apiProv
 	zaiSchema.merge(z.object({ apiProvider: z.literal("zai") })),
 	fireworksSchema.merge(z.object({ apiProvider: z.literal("fireworks") })),
 	ioIntelligenceSchema.merge(z.object({ apiProvider: z.literal("io-intelligence") })),
+	copilotSchema.merge(z.object({ apiProvider: z.literal("copilot") })),
 	defaultSchema,
 ])
 
@@ -360,6 +366,7 @@ export const providerSettingsSchema = z.object({
 	...zaiSchema.shape,
 	...fireworksSchema.shape,
 	...ioIntelligenceSchema.shape,
+	...copilotSchema.shape,
 	...codebaseIndexProviderSchema.shape,
 })
 
@@ -386,6 +393,7 @@ export const MODEL_ID_KEYS: Partial<keyof ProviderSettings>[] = [
 	"litellmModelId",
 	"huggingFaceModelId",
 	"ioIntelligenceModelId",
+	"copilotModelId",
 ]
 
 export const getModelId = (settings: ProviderSettings): string | undefined => {

packages/types/src/providers/copilot.ts

@@ -0,0 +1,16 @@
+export const copilotDefaultModelId = "claude-sonnet-4"
+
+export const GITHUB_CLIENT_ID = "Iv1.b507a08c87ecfe98"
+export const GITHUB_DEVICE_CODE_URL = "https://github.com/login/device/code"
+export const GITHUB_ACCESS_TOKEN_URL = "https://github.com/login/oauth/access_token"
+export const GITHUB_API_KEY_URL = "https://api.github.com/copilot_internal/v2/token"
+export const GITHUB_COPILOT_API_BASE = "https://api.githubcopilot.com/"
+
+export const COPILOT_DEFAULT_HEADER = {
+	accept: "application/json",
+	"content-type": "application/json",
+	"editor-version": "vscode/1.85.1",
+	"editor-plugin-version": "copilot/1.155.0",
+	"user-agent": "GithubCopilot/1.155.0",
+	"accept-encoding": "gzip,deflate,br",
+}

packages/types/src/providers/index.ts

@@ -25,3 +25,4 @@ export * from "./xai.js"
 export * from "./doubao.js"
 export * from "./zai.js"
 export * from "./fireworks.js"
+export * from "./copilot.js"

src/api/index.ts

@@ -36,6 +36,7 @@ import {
 	DoubaoHandler,
 	ZAiHandler,
 	FireworksHandler,
+	CopilotHandler,
 } from "./providers"
 
 export interface SingleCompletionHandler {
@@ -140,6 +141,8 @@ export function buildApiHandler(configuration: ProviderSettings): ApiHandler {
 			return new FireworksHandler(options)
 		case "io-intelligence":
 			return new IOIntelligenceHandler(options)
+		case "copilot":
+			return new CopilotHandler(options)
 		default:
 			apiProvider satisfies "gemini-cli" | undefined
 			return new AnthropicHandler(options)