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<?php |
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/** |
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* @copyright 2017 Vladimir Jimenez |
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* @license https://github.com/allejo/stakx/blob/master/LICENSE.md MIT |
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*/ |
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namespace allejo\stakx\Object; |
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/** |
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* Class JailObject. |
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* |
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* A wrapper object to only allow certain functions on the white list to be called. This is used in order to limit which |
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* functions a user can call from Twig templates to prevent unexpected behavior. |
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*/ |
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class JailObject implements \ArrayAccess |
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{ |
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/** |
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* @var string[] |
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*/ |
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private $whiteListFunctions; |
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/** |
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* @var string[] |
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*/ |
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private $jailedFunctions; |
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/** |
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* @var Jailable |
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*/ |
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private $object; |
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/** |
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* JailObject constructor. |
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* |
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* @param Jailable $object The object that will be jailed |
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* @param array $whiteListFunctions A list of function names that can be called |
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* @param array $jailedFunctions |
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*/ |
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public function __construct(&$object, array $whiteListFunctions, array $jailedFunctions = array()) |
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{ |
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if (!($object instanceof Jailable) && !($object instanceof \ArrayAccess)) |
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{ |
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throw new \InvalidArgumentException('Must implement the ArrayAccess and Jailable interfaces'); |
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} |
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$this->object = &$object; |
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$this->whiteListFunctions = $whiteListFunctions; |
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$this->jailedFunctions = $jailedFunctions; |
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} |
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public function __call($name, $arguments) |
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{ |
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// White listed functions will always be getter functions, so somehow get the name of a possible getter function |
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// name. |
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$lcName = lcfirst($name); |
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$getFxnCall = ($lcName[0] === 'g' && strpos($lcName, 'get') === 0) ? $lcName : sprintf('get%s', ucfirst($name)); |
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// Check if our function call is a jailed call, meaning the function should be mapped to special "jailed" |
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// jailed version of the function call. |
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if (array_key_exists($getFxnCall, $this->jailedFunctions)) |
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{ |
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return call_user_func_array(array($this->object, $this->jailedFunctions[$getFxnCall]), $arguments); |
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} |
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// Otherwise, test to see if the function call is in our white list and call it |
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if (in_array($getFxnCall, $this->whiteListFunctions)) |
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{ |
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return call_user_func_array(array($this->object, $getFxnCall), $arguments); |
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} |
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throw new \BadMethodCallException(); |
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} |
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public function coreInstanceOf($class) |
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{ |
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return is_subclass_of($this->object, $class); |
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} |
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// |
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// ArrayAccess Implementation |
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// |
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/** |
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* {@inheritdoc} |
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*/ |
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public function offsetExists($offset) |
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{ |
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return $this->object->offsetExists($offset); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function offsetGet($offset) |
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{ |
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return $this->object->offsetGet($offset); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function offsetSet($offset, $value) |
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{ |
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return $this->object->offsetSet($offset, $value); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function offsetUnset($offset) |
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{ |
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return $this->object->offsetUnset($offset); |
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} |
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} |
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stakx-io /
stakx
