feat(provider): add GitHub Enterprise support for Copilot (#2522)

Co-authored-by: Jon-Mikkel Korsvik <48263282+jkorsvik@users.noreply.github.com>
Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: Aiden Cline <aidenpcline@gmail.com>

packages/opencode/src/provider/provider.ts

@@ -283,6 +283,18 @@ export namespace Provider {
 
     const configProviders = Object.entries(config.provider ?? {})
 
+    // Add GitHub Copilot Enterprise provider that inherits from GitHub Copilot
+    if (database["github-copilot"]) {
+      const githubCopilot = database["github-copilot"]
+      database["github-copilot-enterprise"] = {
+        ...githubCopilot,
+        id: "github-copilot-enterprise",
+        name: "GitHub Copilot Enterprise",
+        // Enterprise uses a different API endpoint - will be set dynamically based on auth
+        api: undefined,
+      }
+    }
+
     for (const [providerID, provider] of configProviders) {
       const existing = database[providerID]
       const parsed: ModelsDev.Provider = {
@@ -378,14 +390,44 @@ export namespace Provider {
       if (!plugin.auth) continue
       const providerID = plugin.auth.provider
       if (disabled.has(providerID)) continue
+
+      // For github-copilot plugin, check if auth exists for either github-copilot or github-copilot-enterprise
+      let hasAuth = false
       const auth = await Auth.get(providerID)
-      if (!auth) continue
+      if (auth) hasAuth = true
+
+      // Special handling for github-copilot: also check for enterprise auth
+      if (providerID === "github-copilot" && !hasAuth) {
+        const enterpriseAuth = await Auth.get("github-copilot-enterprise")
+        if (enterpriseAuth) hasAuth = true
+      }
+
+      if (!hasAuth) continue
       if (!plugin.auth.loader) continue
-      const options = await plugin.auth.loader(
-        () => Auth.get(providerID) as any,
-        database[plugin.auth.provider],
-      )
-      mergeProvider(plugin.auth.provider, options ?? {}, "custom")
+
+      // Load for the main provider if auth exists
+      if (auth) {
+        const options = await plugin.auth.loader(
+          () => Auth.get(providerID) as any,
+          database[plugin.auth.provider],
+        )
+        mergeProvider(plugin.auth.provider, options ?? {}, "custom")
+      }
+
+      // If this is github-copilot plugin, also register for github-copilot-enterprise if auth exists
+      if (providerID === "github-copilot") {
+        const enterpriseProviderID = "github-copilot-enterprise"
+        if (!disabled.has(enterpriseProviderID)) {
+          const enterpriseAuth = await Auth.get(enterpriseProviderID)
+          if (enterpriseAuth) {
+            const enterpriseOptions = await plugin.auth.loader(
+              () => Auth.get(enterpriseProviderID) as any,
+              database[enterpriseProviderID],
+            )
+            mergeProvider(enterpriseProviderID, enterpriseOptions ?? {}, "custom")
+          }
+        }
+      }
     }
 
     // load config
@@ -458,7 +500,8 @@ export namespace Provider {
           : installedPath
       const mod = await import(modPath)
       if (options["timeout"] !== undefined && options["timeout"] !== null) {
-        // Only override fetch if user explicitly sets timeout
+        // Preserve custom fetch if it exists, wrap it with timeout logic
+        const customFetch = options["fetch"]
         options["fetch"] = async (input: any, init?: BunFetchRequestInit) => {
           const { signal, ...rest } = init ?? {}
 
@@ -468,7 +511,8 @@ export namespace Provider {
 
           const combined = signals.length > 1 ? AbortSignal.any(signals) : signals[0]
 
-          return fetch(input, {
+          const fetchFn = customFetch ?? fetch
+          return fetchFn(input, {
             ...rest,
             signal: combined,
             // @ts-ignore see here: https://github.com/oven-sh/bun/issues/16682