MDL-61952 gradeexport_xls: Implement privacy API

grade/export/xls/classes/privacy/provider.php

@@ -0,0 +1,46 @@
+<?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 gradeexport_xls.
+ *
+ * @package    gradeexport_xls
+ * @copyright  2018 Sara Arjona <sara@moodle.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace gradeexport_xls\privacy;
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Privacy Subsystem for gradeexport_xls implementing null_provider.
+ *
+ * @copyright  2018 Sara Arjona <sara@moodle.com>
+ * @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() {
+        return 'privacy:metadata';
+    }
+}

grade/export/xls/lang/en/gradeexport_xls.php

@@ -25,6 +25,7 @@
 
 $string['eventgradeexported'] = 'XLS grade exported';
 $string['pluginname'] = 'Excel spreadsheet';
+$string['privacy:metadata'] = 'The Excel spreadsheet grade export plugin does not store any personal data.';
 $string['timeexported'] = 'Last downloaded from this course';
 $string['xls:publish'] = 'Publish XLS grade export';
 $string['xls:view'] = 'Use Excel grade export';