From bbb830d90b684ecc1f9285c19abef3cb3accd13f Mon Sep 17 00:00:00 2001
From: Tobias Heinze <mattock.oblong.8h@icloud.com>
Date: Mon, 29 Sep 2025 09:41:57 +0000
Subject: [PATCH 1/2] Updated Gitlab Provider to support baseURL for self
 hosted Instances

---
 .../getting-started/providers/gitlab.mdx      | 38 +++++++++++++++++--
 packages/core/src/providers/gitlab.ts         | 27 ++++++++++---
 2 files changed, 55 insertions(+), 10 deletions(-)

diff --git a/docs/pages/getting-started/providers/gitlab.mdx b/docs/pages/getting-started/providers/gitlab.mdx
index 85a6f7207a..040d1f97df 100644
--- a/docs/pages/getting-started/providers/gitlab.mdx
+++ b/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>
diff --git a/packages/core/src/providers/gitlab.ts b/packages/core/src/providers/gitlab.ts
index cc2562586d..dfccf6a659 100644
--- a/packages/core/src/providers/gitlab.ts
+++ b/packages/core/src/providers/gitlab.ts
@@ -109,24 +109,39 @@ 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"
+  const apiBaseUrl = config?.instance?.baseUrl
+    ? `${config?.instance?.baseUrl}/api/v4`
+    : "https://gitlab.com/api/v4"
+
   return {
     id: "gitlab",
     name: "GitLab",
     type: "oauth",
-    authorization: "https://gitlab.com/oauth/authorize?scope=read_user",
-    token: "https://gitlab.com/oauth/token",
-    userinfo: "https://gitlab.com/api/v4/user",
+    authorization: {
+      url: `${baseUrl}/oauth/authorize?scope=read_user`,
+    },
+    token: `${baseUrl}/oauth/token`,
+    userinfo: {
+      url: `${apiBaseUrl}/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,
   }
 }

From f8662d09a7fba44a3675a0c02b9791e28a7949b4 Mon Sep 17 00:00:00 2001
From: Tobias Heinze <mattock.oblong.8h@icloud.com>
Date: Mon, 29 Sep 2025 09:50:11 +0000
Subject: [PATCH 2/2] Fix the api Base URL

---
 packages/core/src/providers/gitlab.ts | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/packages/core/src/providers/gitlab.ts b/packages/core/src/providers/gitlab.ts
index dfccf6a659..69b25dca25 100644
--- a/packages/core/src/providers/gitlab.ts
+++ b/packages/core/src/providers/gitlab.ts
@@ -118,21 +118,14 @@ export default function GitLab<P extends GitLabProfile>(
   }
 ): OAuthConfig<P> {
   const baseUrl = config?.instance?.baseUrl ?? "https://gitlab.com"
-  const apiBaseUrl = config?.instance?.baseUrl
-    ? `${config?.instance?.baseUrl}/api/v4`
-    : "https://gitlab.com/api/v4"
 
   return {
     id: "gitlab",
     name: "GitLab",
     type: "oauth",
-    authorization: {
-      url: `${baseUrl}/oauth/authorize?scope=read_user`,
-    },
+    authorization: `${baseUrl}/oauth/authorize?scope=read_user`,
     token: `${baseUrl}/oauth/token`,
-    userinfo: {
-      url: `${apiBaseUrl}/user`,
-    },
+    userinfo: `${baseUrl}/api/v4/user`,
     profile(profile) {
       return {
         id: profile.sub?.toString() ?? profile.id?.toString(),