1<?php
2
3/*
4 * This file is part of the Assetic package, an OpenSky project.
5 *
6 * (c) 2010-2014 OpenSky Project Inc
7 *
8 * For the full copyright and license information, please view the LICENSE
9 * file that was distributed with this source code.
10 */
11
12namespace Assetic\Asset;
13
14use Assetic\Filter\FilterInterface;
15use Assetic\Util\VarUtils;
16
17/**
18 * Represents an asset loaded via an HTTP request.
19 *
20 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
21 */
22class HttpAsset extends BaseAsset
23{
24    private $sourceUrl;
25    private $ignoreErrors;
26
27    /**
28     * Constructor.
29     *
30     * @param string  $sourceUrl    The source URL
31     * @param array   $filters      An array of filters
32     * @param Boolean $ignoreErrors
33     * @param array   $vars
34     *
35     * @throws \InvalidArgumentException If the first argument is not an URL
36     */
37    public function __construct($sourceUrl, $filters = array(), $ignoreErrors = false, array $vars = array())
38    {
39        if (0 === strpos($sourceUrl, '//')) {
40            $sourceUrl = 'http:'.$sourceUrl;
41        } elseif (false === strpos($sourceUrl, '://')) {
42            throw new \InvalidArgumentException(sprintf('"%s" is not a valid URL.', $sourceUrl));
43        }
44
45        $this->sourceUrl = $sourceUrl;
46        $this->ignoreErrors = $ignoreErrors;
47
48        list($scheme, $url) = explode('://', $sourceUrl, 2);
49        list($host, $path) = explode('/', $url, 2);
50
51        parent::__construct($filters, $scheme.'://'.$host, $path, $vars);
52    }
53
54    public function load(FilterInterface $additionalFilter = null)
55    {
56        $content = @file_get_contents(
57            VarUtils::resolve($this->sourceUrl, $this->getVars(), $this->getValues())
58        );
59
60        if (false === $content && !$this->ignoreErrors) {
61            throw new \RuntimeException(sprintf('Unable to load asset from URL "%s"', $this->sourceUrl));
62        }
63
64        $this->doLoad($content, $additionalFilter);
65    }
66
67    public function getLastModified()
68    {
69        if (false !== @file_get_contents($this->sourceUrl, false, stream_context_create(array('http' => array('method' => 'HEAD'))))) {
70            foreach ($http_response_header as $header) {
71                if (0 === stripos($header, 'Last-Modified: ')) {
72                    list(, $mtime) = explode(':', $header, 2);
73
74                    return strtotime(trim($mtime));
75                }
76            }
77        }
78    }
79}
80