MDL-58774 auth_oauth2: Cleanup on user delete.

auth/oauth2/classes/api.php

@@ -319,4 +319,18 @@ class api {
 
         $login->delete();
     }
+
+    /**
+     * Delete linked logins for a user.
+     *
+     * @param \core\event\user_deleted $event
+     * @return boolean
+     */
+    public static function user_deleted(\core\event\user_deleted $event) {
+        global $DB;
+
+        $userid = $event->objectid;
+
+        return $DB->delete_records(linked_login::TABLE, ['userid' => $userid]);
+    }
 }

auth/oauth2/db/events.php

@@ -0,0 +1,31 @@
+<?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/>.
+
+/**
+ * This file definies observers needed by the plugin.
+ *
+ * @package    auth_oauth2
+ * @copyright  2017 Damyon Wiese
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+// List of observers.
+$observers = [
+    [
+        'eventname'   => '\core\event\user_deleted',
+        'callback'    => '\auth_oauth2\api::user_deleted',
+    ],
+];

auth/oauth2/version.php

@@ -24,6 +24,6 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version   = 2017032300;        // The current plugin version (Date: YYYYMMDDXX).
+$plugin->version   = 2017050800;        // The current plugin version (Date: YYYYMMDDXX).
 $plugin->requires  = 2016112900;        // Requires this Moodle version.
 $plugin->component = 'auth_oauth2';       // Full name of the plugin (used for diagnostics).