Harden auth profile fallback for slow backend responses

frontend/app/api/auth/me/route.ts

@@ -16,10 +16,18 @@ export async function GET(req: NextRequest) {
 
   try {
     const auth = await buildBackendRequestHeaders(req);
-    const res = await fetch(`${API_BASE}/api/auth/me`, {
+    const controller = new AbortController();
-      headers: auth.headers,
+    const timeoutId = setTimeout(() => controller.abort(), 6000);
-      cache: "no-store",
+    let res: Response;
-    });
+    try {
+      res = await fetch(`${API_BASE}/api/auth/me`, {
+        headers: auth.headers,
+        cache: "no-store",
+        signal: controller.signal,
+      });
+    } finally {
+      clearTimeout(timeoutId);
+    }
     if (res.status === 401 || res.status === 403) {
       const response = NextResponse.json({
         authenticated: false,
@@ -30,6 +38,23 @@ export async function GET(req: NextRequest) {
     }
     if (!res.ok) {
       const raw = await res.text();
+      if (auth.authUserId) {
+        const response = NextResponse.json({
+          authenticated: true,
+          user_id: auth.authUserId,
+          email: auth.authEmail || null,
+          subscription_active: null,
+          subscription_plan_code: null,
+          subscription_expires_at: null,
+          subscription_total_expires_at: null,
+          subscription_queued_days: 0,
+          subscription_queued_count: 0,
+          points: 0,
+          degraded_auth_profile: true,
+          degraded_reason: `backend_${res.status}`,
+        });
+        return applyAuthResponseCookies(response, auth.response);
+      }
       const response = NextResponse.json(
         { error: `Backend returned ${res.status}`, detail: raw.slice(0, 300) },
         { status: res.status },
@@ -40,9 +65,28 @@ export async function GET(req: NextRequest) {
     const response = NextResponse.json(data);
     return applyAuthResponseCookies(response, auth.response);
   } catch (error) {
+    const auth = await buildBackendRequestHeaders(req);
+    if (auth.authUserId) {
+      const response = NextResponse.json({
+        authenticated: true,
+        user_id: auth.authUserId,
+        email: auth.authEmail || null,
+        subscription_active: null,
+        subscription_plan_code: null,
+        subscription_expires_at: null,
+        subscription_total_expires_at: null,
+        subscription_queued_days: 0,
+        subscription_queued_count: 0,
+        points: 0,
+        degraded_auth_profile: true,
+        degraded_reason: String(error),
+      });
+      return applyAuthResponseCookies(response, auth.response);
+    }
     return NextResponse.json(
       { error: "Failed to fetch auth profile", detail: String(error) },
       { status: 500 },
     );
   }
 }
+

frontend/lib/backend-auth.ts

@@ -9,6 +9,8 @@ export const FORWARDED_SUPABASE_EMAIL_HEADER = "x-polyweather-auth-email";
 type HeaderBuildResult = {
   headers: HeadersInit;
   response: NextResponse | null;
+  authUserId?: string | null;
+  authEmail?: string | null;
 };
 
 type HeaderBuildOptions = {
@@ -59,20 +61,20 @@ export async function buildBackendRequestHeaders(
 
     if (incomingAuth) {
       headers.set("Authorization", `Bearer ${incomingAuth}`);
-      return { headers, response: passthroughResponse };
+      return { headers, response: passthroughResponse, authUserId: forwardedUserId || null, authEmail: forwardedEmail || null };
     }
     const accessToken = session?.access_token || "";
     if (accessToken) {
       // Fallback to cookie-backed session when request does not carry bearer.
       headers.set("Authorization", `Bearer ${accessToken}`);
     }
-    return { headers, response: passthroughResponse };
+    return { headers, response: passthroughResponse, authUserId: forwardedUserId || null, authEmail: forwardedEmail || null };
   }
 
   if (incomingAuth) {
     headers.set("Authorization", `Bearer ${incomingAuth}`);
   }
-  return { headers, response: null };
+  return { headers, response: null, authUserId: null, authEmail: null };
 }
 
 export function applyAuthResponseCookies(
@@ -87,3 +89,5 @@ export function applyAuthResponseCookies(
   }
   return target;
 }
+
+