MDL-61307 core_privacy: Implementation of itself

lang/en/privacy.php

@@ -21,3 +21,5 @@
  * @copyright  2018 Andrew Nicols <andrew@nicols.co.uk>
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
+
+$string['privacy:metadata'] = 'The privacy subsystem does not store any data of it\'s own and is designed to act as a conduit between components and the interface used to describe, export, and remove their data.';

privacy/classes/privacy/provider.php

+<?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/>.
+
+/**
+ * Privacy Subsystem implementation for the Privacy Subsystem (how very meta).
+ *
+ * @package    core_privacy
+ * @copyright  2018 Andrew Nicols <andrew@nicols.co.uk>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace core_privacy\privacy;
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * The privacy subsystem does not store any data of it's own.
+ * It merely serves as a conduit to allow other components to describe, export, and delete data.
+ *
+ * @copyright  2018 Andrew Nicols <andrew@nicols.co.uk>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class provider implements \core_privacy\local\metadata\null_provider {
+
+    /**
+     * Get the language string identifier with the component's language
+     * file to explain why this plugin stores no data.
+     *
+     * @return  string
+     */
+    public static function get_reason() : string {
+        return 'privacy:metadata';
+    }
+}