Init

core/bitrix/modules/messageservice/lib/context/user.php

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+<?php
+namespace Bitrix\MessageService\Context;
+
+use Bitrix\Main\Loader;
+
+class User
+{
+	public static function getId()
+	{
+		$user = static::getUser();
+		return $user? (int)$user->getId() : 0;
+	}
+
+	/** @return \CUser|null */
+	public static function getUser()
+	{
+		return isset($GLOBALS['USER']) && $GLOBALS['USER'] instanceof \CUser ? $GLOBALS['USER'] : null;
+	}
+
+	public static function isAdmin()
+	{
+		$user = static::getUser();
+
+		if ($user && $user->isAuthorized())
+		{
+			return (
+				$user->IsAdmin()
+				||
+				Loader::includeModule('bitrix24') && \CBitrix24::isPortalAdmin($user->getId())
+			);
+		}
+
+		return false;
+	}
+}