fix: add error handling to middleware to prevent INVOCATION_FAILED

- Check if Supabase env vars are configured before using them
- Wrap Supabase auth call in try/catch to prevent 500 crashes
- Graceful fallback: pass through on error instead of crashing

https://claude.ai/code/session_01H2aRGDaKgarPvhay2HxN6Y

middleware.ts

@@ -2,14 +2,37 @@ import { createServerClient } from "@supabase/ssr";
 import { NextResponse, type NextRequest } from "next/server";
 
 export async function middleware(request: NextRequest) {
+  // Si les env vars Supabase ne sont pas configurees, laisser passer
+  const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL;
+  const supabaseAnonKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY;
+
+  if (
+    !supabaseUrl ||
+    !supabaseAnonKey ||
+    supabaseUrl.includes("your-project") ||
+    supabaseAnonKey === "your-anon-key"
+  ) {
+    // Pas de Supabase configure : rediriger les routes protegees vers login
+    const protectedPaths = ["/dashboard", "/formations", "/profil"];
+    const isProtected = protectedPaths.some((p) =>
+      request.nextUrl.pathname.startsWith(p)
+    );
+
+    if (isProtected) {
+      const url = request.nextUrl.clone();
+      url.pathname = "/login";
+      return NextResponse.redirect(url);
+    }
+
+    return NextResponse.next();
+  }
+
+  try {
     let supabaseResponse = NextResponse.next({
       request,
     });
 
-  const supabase = createServerClient(
-    process.env.NEXT_PUBLIC_SUPABASE_URL!,
-    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
-    {
+    const supabase = createServerClient(supabaseUrl, supabaseAnonKey, {
       cookies: {
         getAll() {
           return request.cookies.getAll();
@@ -26,8 +49,7 @@ export async function middleware(request: NextRequest) {
           );
         },
       },
-    }
-  );
+    });
 
     const {
       data: { user },
@@ -57,6 +79,11 @@ export async function middleware(request: NextRequest) {
     }
 
     return supabaseResponse;
+  } catch (e) {
+    console.error("Middleware error:", e);
+    // En cas d'erreur, laisser passer la requete plutot que crasher
+    return NextResponse.next();
+  }
 }
 
 export const config = {