Initial commit: YouTube Studio Flow (backend, frontend, infrastructure, docs)

frontend/src/middleware.ts

@@ -0,0 +1,24 @@
+import { NextResponse } from 'next/server';
+import type { NextRequest } from 'next/server';
+
+const PUBLIC_PATHS = ['/login', '/auth/callback'];
+
+export function middleware(request: NextRequest) {
+  const { pathname } = request.nextUrl;
+  const isPublic = PUBLIC_PATHS.some((p) => pathname.startsWith(p));
+  const hasSession = request.cookies.has('sf_session');
+
+  if (!isPublic && !hasSession) {
+    return NextResponse.redirect(new URL('/login', request.url));
+  }
+
+  if (pathname === '/login' && hasSession) {
+    return NextResponse.redirect(new URL('/', request.url));
+  }
+
+  return NextResponse.next();
+}
+
+export const config = {
+  matcher: ['/((?!_next/static|_next/image|favicon.ico).*)'],
+};