feat: support guest session (#919)

app/(auth)/api/auth/guest/route.ts

@@ -0,0 +1,21 @@
+import { signIn } from '@/app/(auth)/auth';
+import { isDevelopmentEnvironment } from '@/lib/constants';
+import { getToken } from 'next-auth/jwt';
+import { NextResponse } from 'next/server';
+
+export async function GET(request: Request) {
+  const { searchParams } = new URL(request.url);
+  const redirectUrl = searchParams.get('redirectUrl') || '/';
+
+  const token = await getToken({
+    req: request,
+    secret: process.env.AUTH_SECRET,
+    secureCookie: !isDevelopmentEnvironment,
+  });
+
+  if (token) {
+    return NextResponse.redirect(new URL('/', request.url));
+  }
+
+  return signIn('guest', { redirect: true, redirectTo: redirectUrl });
+}