[9.x] Allow signed URLs with custom key resolver

src/Illuminate/Routing/UrlGenerator.php

@@ -811,6 +811,17 @@ public function setKeyResolver(callable $keyResolver)
         return $this;
     }
 
+    /**
+     * Clone a new instance of the URL generator with a different encryption key resolver.
+     *
+     * @param  callable  $keyResolver
+     * @return \Illuminate\Routing\UrlGenerator
+     */
+    public function withKeyResolver(callable $keyResolver)
+    {
+        return (clone $this)->setKeyResolver($keyResolver);
+    }
+
     /**
      * Get the root controller namespace.
      *

tests/Routing/RoutingUrlGeneratorTest.php

@@ -867,6 +867,41 @@ public function testRouteGenerationWithBackedEnums()
 
         $this->assertSame('http://www.foo.com/foo/fruits', $url->route('foo.bar', CategoryBackedEnum::Fruits));
     }
+
+    public function testSignedUrlWithKeyResolver()
+    {
+        $url = new UrlGenerator(
+            $routes = new RouteCollection,
+            $request = Request::create('http://www.foo.com/')
+        );
+        $url->setKeyResolver(function () {
+            return 'secret';
+        });
+
+        $route = new Route(['GET'], 'foo', ['as' => 'foo', function () {
+            //
+        }]);
+        $routes->add($route);
+
+        $request = Request::create($url->signedRoute('foo'));
+
+        $this->assertTrue($url->hasValidSignature($request));
+
+        $request = Request::create($url->signedRoute('foo').'?tempered=true');
+
+        $this->assertFalse($url->hasValidSignature($request));
+
+        $url2 = $url->withKeyResolver(function () {
+            return 'other-secret';
+        });
+
+        $this->assertFalse($url2->hasValidSignature($request));
+
+        $request = Request::create($url2->signedRoute('foo'));
+
+        $this->assertTrue($url2->hasValidSignature($request));
+        $this->assertFalse($url->hasValidSignature($request));
+    }
 }
 
 class RoutableInterfaceStub implements UrlRoutable