fix: validate Theia auth via direct Postgres session lookup

Avoid importing authOptions/PrismaClient in the forwardAuth endpoint.
Under --network host (Coolify's build flag), routes that import Prisma
at module evaluation time are silently dropped from the build output.

Instead, read the NextAuth session-token cookie directly and verify
it with a raw SQL query against the sessions table - the same pattern
used by other working API routes via @/lib/db-postgres.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/api/theia-auth/route.ts

@@ -5,29 +5,79 @@
  *
  * Traefik calls this URL for every request to the Theia IDE, forwarding
  * the user's Cookie header via authRequestHeaders. We validate the
- * NextAuth session and return:
- *   200  — session valid, Traefik lets the request through
- *   302  — no session, redirect browser to Vibn login
+ * NextAuth database session (strategy: "database") by looking up the
+ * session token directly in Postgres — avoiding Prisma / authOptions
+ * imports that cause build-time issues under --network host.
+ *
+ * Returns:
+ *   200  — valid session, Traefik lets the request through
+ *   302  — no/expired session, redirect browser to Vibn login
  */
 
 import { NextRequest, NextResponse } from 'next/server';
-import { getServerSession } from 'next-auth';
-import { authOptions } from '@/lib/auth/authOptions';
+import { query } from '@/lib/db-postgres';
+
+export const dynamic = 'force-dynamic';
 
 const APP_URL = process.env.NEXTAUTH_URL ?? 'https://vibnai.com';
 const THEIA_URL = 'https://theia.vibnai.com';
 
-export async function GET(request: NextRequest) {
-  let session: Awaited<ReturnType<typeof getServerSession>> = null;
+// NextAuth v4 uses these cookie names for database sessions
+const SESSION_COOKIE_NAMES = [
+  '__Secure-next-auth.session-token', // HTTPS (production)
+  'next-auth.session-token',          // HTTP fallback
+];
 
-  try {
-    session = await getServerSession(authOptions);
-  } catch {
-    // Treat any session-validation errors as unauthenticated
+export async function GET(request: NextRequest) {
+  // Extract session token from cookies
+  let sessionToken: string | null = null;
+  for (const name of SESSION_COOKIE_NAMES) {
+    const val = request.cookies.get(name)?.value;
+    if (val) { sessionToken = val; break; }
   }
 
-  if (!session?.user) {
-    // Build a callbackUrl so the user lands back in Theia after login
+  if (!sessionToken) {
+    return redirectToLogin(request);
+  }
+
+  // Look up session in Postgres (NextAuth stores sessions in the "sessions" table)
+  let userEmail: string | null = null;
+  let userName: string | null = null;
+
+  try {
+    const result = await query<{ email: string; name: string }>(
+      `SELECT u.email, u.name
+         FROM sessions s
+         JOIN users u ON u.id = s."userId"
+        WHERE s."sessionToken" = $1
+          AND s.expires > NOW()
+        LIMIT 1`,
+      [sessionToken],
+    );
+    if (result.rows.length > 0) {
+      userEmail = result.rows[0].email;
+      userName = result.rows[0].name;
+    }
+  } catch {
+    // DB error → treat as unauthenticated
+    return redirectToLogin(request);
+  }
+
+  if (!userEmail) {
+    return redirectToLogin(request);
+  }
+
+  // Session valid — pass user identity to Theia via response headers
+  return new NextResponse(null, {
+    status: 200,
+    headers: {
+      'X-Auth-Email': userEmail,
+      'X-Auth-Name': userName ?? '',
+    },
+  });
+}
+
+function redirectToLogin(request: NextRequest): NextResponse {
   const forwardedHost = request.headers.get('x-forwarded-host');
   const forwardedProto = request.headers.get('x-forwarded-proto') ?? 'https';
   const forwardedUri = request.headers.get('x-forwarded-uri') ?? '/';
@@ -37,16 +87,5 @@ export async function GET(request: NextRequest) {
     : THEIA_URL;
 
   const loginUrl = `${APP_URL}/auth?callbackUrl=${encodeURIComponent(destination)}`;
-
   return NextResponse.redirect(loginUrl, { status: 302 });
-  }
-
-  // Session is valid — forward user identity to Theia via response headers
-  return new NextResponse(null, {
-    status: 200,
-    headers: {
-      'X-Auth-Email': session.user.email ?? '',
-      'X-Auth-Name': session.user.name ?? '',
-    },
-  });
 }