Introduce keys method to RequestWrapper interface.

This method is introduced to retrieve all keys from the wrapped $_GET, $_POST, and $_COOKIE superglobals
in order to enable the consumer to loop over multiple request parameter using the RequestWrapper infrastructure.

components/ILIAS/HTTP/src/Wrapper/ArrayBasedRequestWrapper.php

@@ -58,4 +58,12 @@ public function has(string $key): bool
     {
         return isset($this->raw_values[$key]);
     }
+
+    /**
+     * @inheritDoc
+     */
+    public function keys(): array
+    {
+        return array_keys($this->raw_values);
+    }
 }

components/ILIAS/HTTP/src/Wrapper/RequestWrapper.php

@@ -34,4 +34,11 @@ public function retrieve(string $key, Transformation $transformation);
 
 
     public function has(string $key): bool;
+
+    /**
+     * Get all keys from the request
+     *
+     * @return array<string|int>
+     */
+    public function keys(): array;
 }

components/ILIAS/HTTP/tests/Services/WrapperTest.php

@@ -82,6 +82,7 @@ public function testQuery(): void
         $this->assertTrue($query->has('key_one'));
         $this->assertTrue($query->has('key_two'));
         $this->assertFalse($query->has('key_three'));
+        $this->assertEquals(['key_one', 'key_two'], $query->keys());
 
         $string_trafo = $this->refinery->kindlyTo()->string();
         $int_trafo = $this->refinery->kindlyTo()->int();
@@ -106,6 +107,7 @@ public function testPost(): void
         $this->assertTrue($post->has('key_one'));
         $this->assertTrue($post->has('key_two'));
         $this->assertFalse($post->has('key_three'));
+        $this->assertEquals(['key_one', 'key_two'], $post->keys());
 
         $string_trafo = $this->refinery->kindlyTo()->string();
         $int_trafo = $this->refinery->kindlyTo()->int();
@@ -130,6 +132,7 @@ public function testCookie(): void
         $this->assertTrue($cookie->has('key_one'));
         $this->assertTrue($cookie->has('key_two'));
         $this->assertFalse($cookie->has('key_three'));
+        $this->assertEquals(['key_one', 'key_two'], $cookie->keys());
 
         $string_trafo = $this->refinery->kindlyTo()->string();
         $int_trafo = $this->refinery->kindlyTo()->int();