feat(providers): Updated Gitlab Provider to support baseURL for self hosted Instances

docs/pages/getting-started/providers/gitlab.mdx

@@ -54,7 +54,16 @@ import NextAuth from "next-auth"
 import GitLab from "next-auth/providers/gitlab"
 
 export const { handlers, auth, signIn, signOut } = NextAuth({
-  providers: [GitLab],
+  providers: [
+    // Default (gitlab.com)
+    GitLab,
+    // Self-hosted example
+    GitLab({
+      instance: {
+        baseUrl: "https://gitlab.example.com"
+      }
+    })
+  ],
 })
 ```
 
@@ -67,7 +76,14 @@ import GitLab from "@auth/qwik/providers/gitlab"
 
 export const { onRequest, useSession, useSignIn, useSignOut } = QwikAuth$(
   () => ({
-    providers: [GitLab],
+    providers: [
+      GitLab,
+      GitLab({
+        instance: {
+          baseUrl: "https://gitlab.example.com"
+        }
+      })
+    ],
   })
 )
 ```
@@ -80,7 +96,14 @@ import { SvelteKitAuth } from "@auth/sveltekit"
 import GitLab from "@auth/sveltekit/providers/gitlab"
 
 export const { handle, signIn, signOut } = SvelteKitAuth({
-  providers: [GitLab],
+  providers: [
+    GitLab,
+    GitLab({
+      instance: {
+        baseUrl: "https://gitlab.example.com"
+      }
+    })
+  ],
 })
 ```
 
@@ -91,7 +114,14 @@ export const { handle, signIn, signOut } = SvelteKitAuth({
 import { ExpressAuth } from "@auth/express"
 import GitLab from "@auth/express/providers/gitlab"
 
-app.use("/auth/*", ExpressAuth({ providers: [GitLab] }))
+app.use("/auth/*", ExpressAuth({ providers: [
+  GitLab,
+  GitLab({
+    instance: {
+      baseUrl: "https://gitlab.example.com"
+    }
+  })
+] }))
 ```
 
   </Code.Express>

packages/core/src/providers/gitlab.ts

@@ -109,24 +109,32 @@ export interface GitLabProfile extends Record<string, any> {
  * :::
  */
 export default function GitLab<P extends GitLabProfile>(
-  options: OAuthUserConfig<P>
+  config: OAuthUserConfig<P> & {
+    /** Configuration for usage with self-hosted GitLab instances. */
+    instance?: {
+      /** The base URL of your GitLab instance. */
+      baseUrl?: string
+    }
+  }
 ): OAuthConfig<P> {
+  const baseUrl = config?.instance?.baseUrl ?? "https://gitlab.com"
+
   return {
     id: "gitlab",
     name: "GitLab",
     type: "oauth",
-    authorization: "https://gitlab.com/oauth/authorize?scope=read_user",
-    token: "https://gitlab.com/oauth/token",
-    userinfo: "https://gitlab.com/api/v4/user",
+    authorization: `${baseUrl}/oauth/authorize?scope=read_user`,
+    token: `${baseUrl}/oauth/token`,
+    userinfo: `${baseUrl}/api/v4/user`,
     profile(profile) {
       return {
-        id: profile.sub?.toString(),
+        id: profile.sub?.toString() ?? profile.id?.toString(),
         name: profile.name ?? profile.username,
         email: profile.email,
         image: profile.avatar_url,
       }
     },
     style: { bg: "#FC6D26", text: "#fff" },
-    options,
+    options: config,
   }
 }