From 519c4b07c260e7b4dbce676e1522e429d22babfd Mon Sep 17 00:00:00 2001
From: Valentin Popov <info@valentineus.link>
Date: Tue, 12 Dec 2017 20:22:11 +0400
Subject: Added external functions for managing administrator rights

---
 externallib.php | 129 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 externallib.php

diff --git a/externallib.php b/externallib.php
new file mode 100644
index 0000000..57d6f9d
--- /dev/null
+++ b/externallib.php
@@ -0,0 +1,129 @@
+<?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/>.
+
+/**
+ * External API functions.
+ *
+ * @package   local_billingpatch
+ * @copyright 2017 "Valentin Popov" <info@valentineus.link>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined("MOODLE_INTERNAL") || die();
+
+require_once($CFG->libdir . "/externallib.php");
+
+/**
+ * External functions of patches.
+ *
+ * @copyright 2017 "Valentin Popov" <info@valentineus.link>
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class local_billingpatch_external extends external_api {
+    /**
+     * Returns description of method parameters.
+     *
+     * @return external_function_parameters
+     * @since  Moodle 2.2
+     */
+    public static function enable_administrator_parameters() {
+        return new external_function_parameters(
+            array(
+                "userid" => new external_value(PARAM_INT, "User ID")
+            )
+        );
+    }
+
+    /**
+     * Adds a user to site administrators.
+     *
+     * @param number $userid
+     * @since Moodle 2.2
+     */
+    public static function enable_administrator($userid) {
+        global $CFG, $DB;
+
+        $parameters = self::validate_parameters(self::enable_administrator_parameters(), array("userid" => $userid));
+        $userid     = strval($parameters["userid"]);
+
+        $context = context_system::instance();
+        self::validate_context($context);
+
+        if ($DB->record_exists("user", array("id" => $userid, "deleted" => 0, "suspended" => 0))) {
+            $admins = explode(",", $CFG->siteadmins);
+            if (!in_array($userid, $admins)) {
+                $admins[] = $userid;
+                set_config("siteadmins", implode(",", $admins));
+            }
+        }
+    }
+
+    /**
+     * Returns description of method result value.
+     *
+     * @since Moodle 2.2
+     */
+    public static function enable_administrator_returns() {
+        return null;
+    }
+
+    /**
+     * Returns description of method parameters.
+     *
+     * @return external_function_parameters
+     * @since  Moodle 2.2
+     */
+    public static function disable_administrator_parameters() {
+        return new external_function_parameters(
+            array(
+                "userid" => new external_value(PARAM_INT, "User ID")
+            )
+        );
+    }
+
+    /**
+     * Removes a user from the site administrators.
+     *
+     * @param number $userid
+     * @since Moodle 2.2
+     */
+    public static function disable_administrator($userid) {
+        global $CFG, $DB;
+
+        $parameters = self::validate_parameters(self::enable_administrator_parameters(), array("userid" => $userid));
+        $userid     = strval($parameters["userid"]);
+
+        $context = context_system::instance();
+        self::validate_context($context);
+
+        if ($DB->record_exists("user", array("id" => $userid, "deleted" => 0, "suspended" => 0))) {
+            $admins = explode(",", $CFG->siteadmins);
+            if ($key = array_search($userid, $admins) !== FALSE) {
+                unset($admins[$key]);
+                set_config("siteadmins", implode(",", $admins));
+            }
+        }
+    }
+
+    /**
+     * Returns description of method parameters.
+     *
+     * @since Moodle 2.2
+     */
+    public static function disable_administrator_returns() {
+        return null;
+    }
+}
\ No newline at end of file
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