[frontend]: add auth middleware

frontend/src/middleware.ts

@@ -0,0 +1,29 @@
+import { type NextRequest, NextResponse } from 'next/server';
+
+export default function middleware(request: NextRequest) {
+  const { url, cookies, nextUrl } = request;
+
+  const session = cookies.get('session')?.value;
+
+  const isAuthRoute = nextUrl.pathname.startsWith('/account');
+  const isDeactivateRoute = nextUrl.pathname === '/account/deactivate';
+  const isDashboardRoute = nextUrl.pathname.startsWith('/dashboard');
+
+  if (!session && isDashboardRoute) {
+    return NextResponse.redirect(new URL('/account/login', url));
+  }
+
+  if (!session && isDeactivateRoute) {
+    return NextResponse.redirect(new URL('/account/login', url));
+  }
+
+  if (session && isAuthRoute && !isDeactivateRoute) {
+    return NextResponse.redirect(new URL('/dashboard/settings', url));
+  }
+
+  return NextResponse.next();
+}
+
+export const config = {
+  matcher: ['/account/:path*', '/dashboard/:path*'],
+};