TwigDataUriStashCache.php

<?php

/**
 * This one leverages include with a data uri. Can't leverage opcache with it, but
 * for those of you with a religious fear of eval, this is an alternative.
 * 
 * Requires allow_url_include to be enabled in php.ini
 */
class TwigDataUriStashCache implements \Twig_CacheInterface
{
    private $pool;
    
    public function __construct(\Stash\Interfaces\PoolInterface $pool)
    {
        $this->pool = $pool;
    }
    
    /**
     * {@inheritdoc}
     */
    public function generateKey($name, $className)
    {
        $key = "$name;$className";
        // Key generation can be tweaked, it doesn't need to be cryptographically secure
        // Just fast.
        $key = "TWIG_CACHE;" . hash_hmac('sha256', $key, 'TWIG', false);
        return $key;
    }
    
    /**
     * {@inheritdoc}
     */
    public function write($key, $content)
    {
        $item = $this->pool->getItem($key);
        $item->set([
            'data' => 'data://text/plain;base64,' . base64_encode($content),
            'timestamp' => time()
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function load($key)
    {
        $item = $this->pool->getItem($key);
        $content = $item->get();
        if(!$item->isMiss()) {
            @include ($content['data']);
        }
    }
    
     /**
     * {@inheritdoc}
     */
    public function getTimestamp($key)
    {
        $item = $this->pool->getItem($key);
        $content = $item->get();
        if(!$item->isMiss()) {
            return $content['timestamp'];
        }
        return 0;
    }
}