Implement login functionality

auth.php

@@ -79,6 +79,59 @@ class auth_plugin_userkey extends auth_plugin_base {
         return false;
     }
 
+    /**
+     * Login user using userkey.
+     *
+     * This is basically customised core require_user_key_login().
+     */
+    public function user_login_userkey() {
+        global $DB;
+
+        $keyvalue = required_param('key', PARAM_ALPHANUM);
+        $wantsurl = optional_param('wantsurl', '', PARAM_LOCALURL);
+
+        $options = array(
+            'script' => core_userkey_manager::CORE_USER_KEY_MANAGER_SCRIPT,
+            'value' => $keyvalue
+        );
+
+        if (!$key = $DB->get_record('user_private_key', $options)) {
+            print_error('invalidkey');
+        }
+
+        if (!empty($key->validuntil) and $key->validuntil < time()) {
+            print_error('expiredkey');
+        }
+
+        if ($key->iprestriction) {
+            $remoteaddr = getremoteaddr(null);
+            if (empty($remoteaddr) or !address_in_subnet($remoteaddr, $key->iprestriction)) {
+                print_error('ipmismatch');
+            }
+        }
+
+        if (!$user = $DB->get_record('user', array('id' => $key->userid))) {
+            print_error('invaliduserid');
+        }
+
+        if (!isset($this->userkeymanager)) {
+            $userkeymanager = new core_userkey_manager($user->id, $this->config);
+            $this->set_userkey_manager($userkeymanager);
+        }
+
+        $this->userkeymanager->delete_key();
+
+        $user = get_complete_user_data('id', $user->id);
+
+        complete_user_login($user);
+
+        if (!empty($wantsurl)) {
+            redirect($wantsurl);
+        } else {
+            redirect('/');
+        }
+    }
+
     /**
      * Don't store local passwords.
      *

login.php

@@ -0,0 +1,27 @@
+<?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/>.
+
+/**
+ * Login page for auth_userkey.
+ *
+ * @package    auth_userkey
+ * @copyright  2016 Dmitrii Metelkin (dmitriim@catalyst-au.net)
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+require_once(dirname(__FILE__) . '/../../config.php');
+
+get_auth_plugin('userkey')->user_login_userkey();