[5.x] Require url in nocache request (#12975)

Co-authored-by: Jason Varga <jason@pixelfear.com>

Author: Jade-GG

src/StaticCaching/NoCache/Controller.php

@@ -10,6 +10,8 @@ class Controller
 {
     public function __invoke(Request $request, Session $session)
     {
+        $request->validate(['url' => 'required|string']);
+
         $url = $request->input('url');
 
         if (config('statamic.static_caching.ignore_query_strings', false)) {

tests/StaticCaching/NocacheRouteTest.php

@@ -53,4 +53,12 @@ public function index()
                 ],
             ]);
     }
+
+    #[Test]
+    public function url_is_required()
+    {
+        $this
+            ->postJson('/!/nocache')
+            ->assertJsonValidationErrorFor('url');
+    }
 }