From 72ed3241226940bee8c45b27be85b4a22453f99c Mon Sep 17 00:00:00 2001
From: Valentin Popov <info@valentineus.link>
Date: Thu, 7 Jun 2018 06:39:36 +0400
Subject: Main library

Signed-off-by: Valentin Popov <info@valentineus.link>
---
 lib.php | 137 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 lib.php

diff --git a/lib.php b/lib.php
new file mode 100644
index 0000000..b67904f
--- /dev/null
+++ b/lib.php
@@ -0,0 +1,137 @@
+<?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/>.
+
+/**
+ * Main functions of the plugin.
+ *
+ * @copyright   2018 "Valentin Popov" <info@valentineus.link>
+ * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @package     tool_apisiteadmins
+ */
+
+defined("MOODLE_INTERNAL") || die();
+
+/**
+ * Functions for working with the list of administrators.
+ *
+ * @copyright   2018 "Valentin Popov" <info@valentineus.link>
+ * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @package     tool_apisiteadmins
+ */
+class tool_apisiteadmins {
+    /**
+     * Adds a user to the list of administrators.
+     *
+     * @param   number  $userid System user ID
+     * @return  boolean         Result of execution
+     */
+    public static function add_user($userid) {
+        if (!core_user::is_real_user($userid, true)) {
+            print_error("invaliduser", "error", null);
+        }
+
+        $userid = (int)$userid;
+        $admins = self::get_list();
+        $admins[$userid] = $userid;
+
+        self::create_event("administrator_added", $userid);
+        return self::save_changes($admins);
+    }
+
+    /**
+     * Removes a user from the list of administrators.
+     *
+     * @param   number  $userid System user ID
+     * @return  boolean         Result of execution
+     */
+    public static function remove_user($userid) {
+        if (!core_user::is_real_user($userid, true)) {
+            print_error("invaliduser", "error", null);
+        }
+
+        $userid = (int)$userid;
+        $admins = self::get_list();
+        unset($admins[$userid]);
+
+        self::create_event("administrator_deleted", $userid);
+        return self::save_changes($admins);
+    }
+
+    /**
+     * Registers the user as the primary administrator.
+     *
+     * @param   number  $userid System user ID
+     * @return  boolean         Result of execution
+     */
+    public static function set_main($userid) {
+        if (!core_user::is_real_user($userid, true)) {
+            print_error("invaliduser", "error", null);
+        }
+
+        $userid = (int)$userid;
+        $admins = self::get_list();
+        if (isset($admins[$userid])) {
+            unset($admins[$userid]);
+            array_unshift($admins, $userid);
+        }
+
+        self::create_event("administrator_changed", $userid);
+        return self::save_changes($admins);
+    }
+
+    /**
+     * Creates an entry in the system log.
+     *
+     * @param   string  $name   Event name
+     * @param   number  $userid System user ID
+     */
+    private static function create_event($name, $userid) {
+        $function = "tool_apisiteadmins\\event\\$name";
+        $function::create(array("relateduserid" => $userid))->trigger();
+    }
+
+    /**
+     * Applies the changes on the site.
+     *
+     * @return  array           List of administrators
+     */
+    private static function get_list() {
+        $config = get_config("core", "siteadmins");
+
+        $result = array();
+        foreach (explode(",", $config) as $id) {
+            $id = (int)$id;
+            if (!empty($id)) {
+                $result[$id] = $id;
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Applies the changes on the site.
+     *
+     * @param   array   $admins List of administrators
+     */
+    private static function save_changes($admins) {
+        if (empty($admins)) {
+            $admins = self::get_list();
+        }
+
+        return set_config("siteadmins", implode(",", $admins));
+    }
+}
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