Chris@0: <?php
Chris@0: 
Chris@0: /*
Chris@0:  * This file is part of the Symfony package.
Chris@0:  *
Chris@0:  * (c) Fabien Potencier <fabien@symfony.com>
Chris@0:  *
Chris@0:  * For the full copyright and license information, please view the LICENSE
Chris@0:  * file that was distributed with this source code.
Chris@0:  */
Chris@0: 
Chris@0: namespace Symfony\Component\HttpKernel\Config;
Chris@0: 
Chris@0: use Symfony\Component\Config\Resource\SelfCheckingResourceInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * EnvParametersResource represents resources stored in prefixed environment variables.
Chris@0:  *
Chris@0:  * @author Chris Wilkinson <chriswilkinson84@gmail.com>
Chris@0:  */
Chris@0: class EnvParametersResource implements SelfCheckingResourceInterface, \Serializable
Chris@0: {
Chris@0:     /**
Chris@0:      * @var string
Chris@0:      */
Chris@0:     private $prefix;
Chris@0: 
Chris@0:     /**
Chris@0:      * @var string
Chris@0:      */
Chris@0:     private $variables;
Chris@0: 
Chris@0:     /**
Chris@0:      * Constructor.
Chris@0:      *
Chris@0:      * @param string $prefix
Chris@0:      */
Chris@0:     public function __construct($prefix)
Chris@0:     {
Chris@0:         $this->prefix = $prefix;
Chris@0:         $this->variables = $this->findVariables();
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * {@inheritdoc}
Chris@0:      */
Chris@0:     public function __toString()
Chris@0:     {
Chris@0:         return serialize($this->getResource());
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @return array An array with two keys: 'prefix' for the prefix used and 'variables' containing all the variables watched by this resource
Chris@0:      */
Chris@0:     public function getResource()
Chris@0:     {
Chris@0:         return array('prefix' => $this->prefix, 'variables' => $this->variables);
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * {@inheritdoc}
Chris@0:      */
Chris@0:     public function isFresh($timestamp)
Chris@0:     {
Chris@0:         return $this->findVariables() === $this->variables;
Chris@0:     }
Chris@0: 
Chris@0:     public function serialize()
Chris@0:     {
Chris@0:         return serialize(array('prefix' => $this->prefix, 'variables' => $this->variables));
Chris@0:     }
Chris@0: 
Chris@0:     public function unserialize($serialized)
Chris@0:     {
Chris@0:         $unserialized = unserialize($serialized);
Chris@0: 
Chris@0:         $this->prefix = $unserialized['prefix'];
Chris@0:         $this->variables = $unserialized['variables'];
Chris@0:     }
Chris@0: 
Chris@0:     private function findVariables()
Chris@0:     {
Chris@0:         $variables = array();
Chris@0: 
Chris@0:         foreach ($_SERVER as $key => $value) {
Chris@0:             if (0 === strpos($key, $this->prefix)) {
Chris@0:                 $variables[$key] = $value;
Chris@0:             }
Chris@0:         }
Chris@0: 
Chris@0:         ksort($variables);
Chris@0: 
Chris@0:         return $variables;
Chris@0:     }
Chris@0: }