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<?php |
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/** |
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* @copyright 2018 Vladimir Jimenez |
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* @license https://github.com/stakx-io/stakx/blob/master/LICENSE.md MIT |
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*/ |
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namespace allejo\stakx\Document; |
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/** |
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* A wrapper object to only allow certain functions on the white list to be called and will redirect "jailed" function |
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* calls to their appropriate jailed calls. This is used in order to limit which functions a user can call from |
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* templates to prevent unexpected behavior. |
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*/ |
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class JailedDocument implements \ArrayAccess, \IteratorAggregate, \JsonSerializable |
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{ |
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/** @var string[] */ |
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private $whiteListFunctions; |
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/** @var string[] */ |
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private $jailedFunctions; |
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/** @var TemplateReadyDocument */ |
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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 TemplateReadyDocument $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 $jailedFunctions a list of functions that will be redirected to another function |
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*/ |
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public function __construct(TemplateReadyDocument &$object, array $whiteListFunctions, array $jailedFunctions = []) |
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{ |
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$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 = ($lcName[0] === '_' || strpos($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, $this->jailedFunctions)) |
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{ |
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return call_user_func_array([$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, $this->whiteListFunctions)) |
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{ |
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return call_user_func_array([$this->object, $getFxnCall], $arguments); |
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} |
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throw new \BadMethodCallException(); |
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} |
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/** |
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* Check if the jailed object is an instance of a given class. |
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* |
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* @param string $class |
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* |
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* @return bool |
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*/ |
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public function _coreInstanceOf($class) |
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{ |
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return ($this->object instanceof $class) || is_subclass_of($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, $value) |
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{ |
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throw new \LogicException('A jailed document is read-only.'); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function offsetUnset($offset) |
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{ |
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throw new \LogicException('A jailed document is read-only.'); |
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} |
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/// |
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// IteratorAggregate implementation |
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/// |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getIterator() |
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{ |
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return $this->object->getIterator(); |
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} |
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/// |
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// JsonSerializable implementation |
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/// |
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/** |
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* {@inheritdoc} |
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*/ |
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public function jsonSerialize() |
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{ |
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return $this->object->jsonSerialize(); |
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} |
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} |
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stakx-io /
stakx
