MDL-85235 core: Add extend url hook

lib/classes/hook/output/extend_url.php

@@ -0,0 +1,65 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace core\hook\output;
+
+use moodle_url;
+
+/**
+ * Allow augmentation of the moodle URL.
+ *
+ * The hook carries a mutable moodle_url. Callbacks can add query params.
+ *
+ * @package    core
+ * @copyright  2025 Safat Shahin <[email protected]>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+#[\core\attribute\label('Allow augmentation of the moodle URL')]
+#[\core\attribute\tags('output')]
+final class extend_url {
+    /**
+     * Create a new instance of the hook.
+     *
+     * @param moodle_url $url The url of the page
+     */
+    public function __construct(
+        /** @var moodle_url The url of the page */
+        private moodle_url $url,
+    ) {
+    }
+
+    /**
+     * Get the URL being modified.
+     *
+     * @return moodle_url
+     */
+    public function get_url(): moodle_url {
+        return $this->url;
+    }
+
+    /**
+     * Add a query parameter to the URL.
+     *
+     * @param string $name The name of the parameter
+     * @param string $value The value of the parameter
+     */
+    public function add_param(
+        string $name,
+        string $value,
+    ): void {
+        $this->url->param($name, $value);
+    }
+}