From f643cefa4498ec6ecd76479db6c7de22868e4309 Mon Sep 17 00:00:00 2001
From: Valentin Popov <info@valentineus.link>
Date: Tue, 17 Oct 2017 09:27:45 +0400
Subject: Initial commit

---
 auth.php | 167 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 167 insertions(+)
 create mode 100644 auth.php

(limited to 'auth.php')

diff --git a/auth.php b/auth.php
new file mode 100644
index 0000000..d41a414
--- /dev/null
+++ b/auth.php
@@ -0,0 +1,167 @@
+<?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/>.
+
+/**
+ * Authorization by direct link.
+ *
+ * @package    auth_link
+ * @copyright  2017 Valentin Popov (https://valentineus.link/)
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+require_once($CFG->libdir.'/authlib.php');
+
+/**
+ * Plugin for no authentication.
+ */
+class auth_plugin_link extends auth_plugin_base {
+
+    /**
+     * Constructor.
+     */
+    public function __construct() {
+        $this->authtype = 'link';
+    }
+
+    /**
+     * Old syntax of class constructor. Deprecated in PHP7.
+     * @deprecated since Moodle 3.1
+     */
+    public function auth_plugin_link() {
+        debugging('Use of class name as constructor is deprecated', DEBUG_DEVELOPER);
+        self::__construct();
+    }
+
+    /**
+     * Returns true if the username and password work or don't exist and false
+     * if the user exists and the password is wrong.
+     * @param string $username The username
+     * @param string $password The password
+     * @return bool Authentication success or failure.
+     */
+    function user_login($username, $password) {
+        global $CFG, $DB;
+
+        if ($user = $DB->get_record('user', array('username'=>$username, 'mnethostid'=>$CFG->mnet_localhost_id))) {
+            return validate_internal_user_password($user, $password);
+        }
+
+        return true;
+    }
+
+    /**
+     * No password updates.
+     */
+    function user_update_password($user, $newpassword) {
+        return false;
+    }
+
+    function prevent_local_passwords() {
+        // just in case, we do not want to loose the passwords
+        return false;
+    }
+
+    /**
+     * Returns true if this authentication plugin is 'internal'.
+     * @return bool
+     */
+    function is_internal() {
+        //we do not know if it was internal or external originally
+        return true;
+    }
+
+    /**
+     * No changing of password.
+     */
+    function can_change_password() {
+        return false;
+    }
+
+    /**
+     * Returns the URL for changing the user's pw, or empty if the default can
+     * be used.
+     * @return moodle_url
+     */
+    function change_password_url() {
+        return null;
+    }
+
+    /**
+     * No password resetting.
+     */
+    function can_reset_password() {
+        return true;
+    }
+
+    /**
+     * Returns true if plugin can be manually set.
+     * @return bool
+     */
+    function can_be_manually_set() {
+        return true;
+    }
+
+    /**
+     * Hook for overriding behaviour before going to the login page.
+     */
+    function pre_loginpage_hook() {
+        $this->loginpage_hook();
+    }
+
+    /**
+     * Hook for overriding behaviour of login page.
+     */
+    function loginpage_hook() {
+        global $DB;
+
+        if (!isloggedin()) {
+            if (isset($_REQUEST['username']) &&
+                isset($_REQUEST['password'])) {
+
+                $username = htmlspecialchars($_REQUEST['username']);
+                $password = htmlspecialchars($_REQUEST['password']);
+
+                // User existence check
+                if ($user = $DB->get_record('user', array( 'username' => $username) )) {
+                    // Verification of authorization data
+                    if (validate_internal_user_password($user, $password)) {
+                        complete_user_login($user);
+                        $this->redirect_user();
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Redirect client to the original target.
+     */
+    function redirect_user() {
+        global $CFG, $SESSION;
+
+        if (isset($SESSION->wantsurl)) {
+            $redirect = $SESSION->wantsurl;
+        } elseif (isset($_GET['wantsurl'])) {
+            $redirect = htmlspecialchars($_GET['wantsurl']);
+        } else {
+            $redirect = $CFG->wwwroot;
+        }
+
+        redirect($redirect);
+    }
+}
\ No newline at end of file
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