<?php

/*

 * This file is part of the Assetic package, an OpenSky project.

 *

 * (c) 2010-2011 OpenSky Project Inc

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

namespace Assetic\Asset;

use Assetic\Filter\FilterInterface;

/**

 * Represents an asset loaded via an HTTP request.

 *

 * @author Kris Wallsmith <kris.wallsmith@gmail.com>

 */

class HttpAsset extends BaseAsset

{

    private $sourceUrl;

    private $ignoreErrors;

    /**

     * Constructor.

     *

     * @param string $sourceUrl The source URL

     * @param array  $filters   An array of filters

     *

     * @throws InvalidArgumentException If the first argument is not an URL

     */

    public function __construct($sourceUrl, $filters = array(), $ignoreErrors = false)

    {

        if (0 === strpos($sourceUrl, '//')) {

            $sourceUrl = 'http:'.$sourceUrl;

        } elseif (false === strpos($sourceUrl, '://')) {

            throw new \InvalidArgumentException(sprintf('"%s" is not a valid URL.', $sourceUrl));

        }

        $this->sourceUrl = $sourceUrl;

        $this->ignoreErrors = $ignoreErrors;

        list($scheme, $url) = explode('://', $sourceUrl, 2);

        list($host, $path) = explode('/', $url, 2);

        parent::__construct($filters, $scheme.'://'.$host, $path);

    }

    public function load(FilterInterface $additionalFilter = null)

    {

        if (false === $content = @file_get_contents($this->sourceUrl)) {

            if ($this->ignoreErrors) {

                return;

            } else {

                throw new \RuntimeException(sprintf('Unable to load asset from URL "%s"', $this->sourceUrl));

            }

        }

        $this->doLoad($content, $additionalFilter);

    }

    public function getLastModified()

    {

        if (false !== @file_get_contents($this->sourceUrl, false, stream_context_create(array('http' => array('method' => 'HEAD'))))) {

            foreach ($http_response_header as $header) {

                if (0 === stripos($header, 'Last-Modified: ')) {

                    list(, $mtime) = explode(':', $header, 2);

                    return strtotime(trim($mtime));

                }

            }

        }

    }

}