From b04613784acb8824e748a3d091a219db3acd4263 Mon Sep 17 00:00:00 2001
From: ngc2207 <cfngc3109@gmail.com>
Date: Sat, 7 Dec 2024 21:01:22 +0800
Subject: [PATCH] feat(auth): implement Gitea authentication provider with
 NextAuth integration

---
 package.json                            |  2 +
 src/app/api/auth/[...nextauth]/route.ts |  3 ++
 src/auth.ts                             | 15 ++++++
 src/lib/providers/gitea.ts              | 72 +++++++++++++++++++++++++
 src/middleware.ts                       |  1 +
 5 files changed, 93 insertions(+)
 create mode 100644 src/app/api/auth/[...nextauth]/route.ts
 create mode 100644 src/auth.ts
 create mode 100644 src/lib/providers/gitea.ts
 create mode 100644 src/middleware.ts

diff --git a/package.json b/package.json
index ad2f657..2ae83ca 100644
--- a/package.json
+++ b/package.json
@@ -11,8 +11,10 @@
   "dependencies": {
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
+    "gitea-js": "^1.22.0",
     "lucide-react": "^0.468.0",
     "next": "15.0.4",
+    "next-auth": "^5.0.0-beta.25",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
     "tailwind-merge": "^2.5.5",
diff --git a/src/app/api/auth/[...nextauth]/route.ts b/src/app/api/auth/[...nextauth]/route.ts
new file mode 100644
index 0000000..86c9f3d
--- /dev/null
+++ b/src/app/api/auth/[...nextauth]/route.ts
@@ -0,0 +1,3 @@
+import { handlers } from "@/auth";
+
+export const { GET, POST } = handlers;
diff --git a/src/auth.ts b/src/auth.ts
new file mode 100644
index 0000000..21d7603
--- /dev/null
+++ b/src/auth.ts
@@ -0,0 +1,15 @@
+import NextAuth from "next-auth";
+import Gitea from "@/lib/providers/gitea";
+
+export const { handlers, signIn, signOut, auth } = NextAuth({
+  providers: [
+    Gitea({
+      clientId: process.env.AUTH_GITEA_ID,
+      clientSecret: process.env.AUTH_GITEA_SECRET,
+      enterprise: {
+        baseUrl: process.env.AUTH_GITEA_URL,
+      },
+    }),
+  ],
+  secret: process.env.AUTH_SECRET,
+});
diff --git a/src/lib/providers/gitea.ts b/src/lib/providers/gitea.ts
new file mode 100644
index 0000000..df50847
--- /dev/null
+++ b/src/lib/providers/gitea.ts
@@ -0,0 +1,72 @@
+import { Email as GiteaEmail, User } from "gitea-js";
+import { OAuthConfig, OAuthUserConfig } from "next-auth/providers";
+
+export interface GiteaProfile extends User {
+  username: string;
+}
+
+export default function Gitea(
+  config: OAuthUserConfig<GiteaProfile> & {
+    enterprise?: {
+      baseUrl?: string;
+    };
+  }
+): OAuthConfig<GiteaProfile> {
+  const baseUrl = config?.enterprise?.baseUrl ?? "https://gitea.com";
+  const apiBaseUrl = config?.enterprise?.baseUrl
+    ? `${config?.enterprise?.baseUrl}/api/v1`
+    : "https://gitea.com/api/v1";
+
+  return {
+    id: "gitea",
+    name: "Gitea",
+    type: "oauth",
+    authorization: {
+      url: `${baseUrl}/login/oauth/authorize`,
+      params: { scope: "read:user user:email" },
+    },
+    token: `${baseUrl}/login/oauth/access_token`,
+    userinfo: {
+      url: `${apiBaseUrl}/user`,
+      async request({
+        tokens,
+        provider,
+      }: {
+        tokens: { access_token: string };
+        provider: OAuthConfig<GiteaProfile>;
+      }) {
+        const profile = await fetch(provider.userinfo?.url as URL, {
+          headers: {
+            Authorization: `Bearer ${tokens.access_token}`,
+            "User-Agent": "authjs",
+          },
+        }).then(async (res) => await res.json());
+
+        if (!profile.email) {
+          const res = await fetch(`${apiBaseUrl}/user/emails`, {
+            headers: {
+              Authorization: `Bearer ${tokens.access_token}`,
+              "User-Agent": "authjs",
+            },
+          });
+
+          if (res.ok) {
+            const emails: GiteaEmail[] = await res.json();
+            profile.email = (emails.find((e) => e.primary) ?? emails[0]).email;
+          }
+        }
+
+        return profile;
+      },
+    },
+    profile(profile) {
+      return {
+        id: profile.id?.toString(),
+        name: profile.username ?? profile.login,
+        email: profile.email,
+        image: profile.avatar_url,
+      };
+    },
+    options: config,
+  };
+}
diff --git a/src/middleware.ts b/src/middleware.ts
new file mode 100644
index 0000000..8155fe0
--- /dev/null
+++ b/src/middleware.ts
@@ -0,0 +1 @@
+export { auth as middleware } from "@/auth";