feat: add github oauth configuration

apps/blog/astro.config.mjs

@@ -1,5 +1,6 @@
 import { defineConfig } from 'astro/config';
 import vercel from '@astrojs/vercel';
+import auth from 'auth-astro';
 import remarkDirective from 'remark-directive';
 import remarkGfm from 'remark-gfm';
 import remarkSlug from 'remark-slug';
@@ -9,6 +10,7 @@ import remarkAside from './src/plugins/remark-aside.ts';
 export default defineConfig({
   output: 'static',
   adapter: vercel(),
+  integrations: [auth()],
   markdown: {
     remarkPlugins: [
       remarkGfm,

apps/blog/auth.config.ts

@@ -0,0 +1,19 @@
+import GitHub from '@auth/core/providers/github';
+import { defineConfig } from 'auth-astro';
+
+export default defineConfig({
+  providers: [
+    GitHub({
+      clientId: import.meta.env.GITHUB_CLIENT_ID,
+      clientSecret: import.meta.env.GITHUB_CLIENT_SECRET,
+    }),
+  ],
+  callbacks: {
+    session({ session, token }) {
+      if (session.user && token.sub) {
+        session.user.id = token.sub;
+      }
+      return session;
+    },
+  },
+});

apps/blog/src/lib/auth.ts

@@ -0,0 +1,3 @@
+export function isAdmin(userId: string | undefined): boolean {
+  return userId === import.meta.env.ADMIN_GITHUB_ID;
+}