Imported code from old repository

classes/Sandbox/FunctionExecutor.php

@@ -0,0 +1,34 @@
+<?php
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+namespace CloudObjects\PhpMAE\Sandbox;
+
+use CloudObjects\PhpMAE\Exceptions\PhpMAEException;
+
+class FunctionExecutor {
+
+    private static $trusted = false;
+    private static $packageWhitelist = [ 'function_exists', 'extension_loaded',
+        'defined', 'ini_get', 'is_callable', 'class_exists', 'get_called_class',
+        'stream_for' ];
+
+    public static function setTrusted(bool $trusted) {
+        self::$trusted = $trusted;
+    }
+
+    public static function execute() {
+        $call = func_get_args();
+        if (self::$trusted == true || in_array($call[0], self::$packageWhitelist))
+            return call_user_func_array($call[0], array_slice($call, 1));        
+        else
+            throw new PhpMAEException("A package attempted to call the non-whitelisted PHP function ".$call[0]."()!");
+    }
+
+    public static function returnNull() {
+        return null;
+    }
+
+}