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<?php
/**
* ownCloud - News
*
* This file is licensed under the Affero General Public License version 3 or
* later. See the COPYING file.
*
* @author Alessandro Cosentino <cosenal@gmail.com>
* @author Bernhard Posselt <dev@bernhard-posselt.com>
* @copyright Alessandro Cosentino 2012
* @copyright Bernhard Posselt 2012, 2014
*/
namespace OCA\News\Utility;
class FaviconFetcher {
private $apiFactory;
private $config;
/**
* Inject a factory to build a simplepie file object. This is needed because
* the file object contains logic in its constructor which makes it
* impossible to inject and test
*/
public function __construct(SimplePieAPIFactory $apiFactory, Config $config) {
$this->apiFactory = $apiFactory;
$this->config = $config;
}
/**
* Fetches a favicon from a given URL
*
* @param string|null $url the url where to fetch it from
* @return null|string
*/
public function fetch($url) {
try {
$url = $this->buildURL($url);
} catch (NoValidUrlException $e) {
return null;
}
$faviconUrl = $this->extractFromPage($url);
// check the url for a valid image
if($faviconUrl && $this->isImage($faviconUrl)) {
return $faviconUrl;
} elseif($url) {
// try /favicon.ico as fallback
$parts = parse_url($url);
$faviconUrl = $parts['scheme'] . "://" . $parts['host'] . (array_key_exists("port", $parts) ? $parts['port'] : '') . "/favicon.ico";
if($this->isImage($faviconUrl)) {
return $faviconUrl;
}
}
return null;
}
/**
* Tries to get a favicon from a page
* @param string $url the url to the page
* @return string the full url to the page
*/
protected function extractFromPage($url) {
if(!$url) {
return null;
}
$file = $this->getFile($url);
/** @noinspection PhpUndefinedFieldInspection */
if($file->body !== '') {
$document = new \DOMDocument();
/** @noinspection PhpUndefinedFieldInspection */
@$document->loadHTML($file->body);
if($document) {
$xpath = new \DOMXpath($document);
$elements = $xpath->query("//link[contains(@rel, 'icon')]");
if ($elements->length > 0) {
/** @noinspection PhpUndefinedMethodInspection */
$iconPath = $elements->item(0)->getAttribute('href');
$absPath = \SimplePie_Misc::absolutize_url($iconPath, $url);
return $absPath;
}
}
}
return null;
}
private function getFile($url) {
if(trim($this->config->getProxyHost()) === '') {
return $this->apiFactory->getFile($url, 10, 5, null, null, false,
null, null, null);
} else {
return $this->apiFactory->getFile($url, 10, 5, null, null, false,
$this->config->getProxyHost(),
$this->config->getProxyPort(),
$this->config->getProxyAuth());
}
}
/**
* Test if the file is an image
* @param string $url the url to the file
* @return bool true if image
*/
protected function isImage($url) {
// check for empty urls
if(!$url) {
return false;
}
$file = $this->getFile($url);
/** @noinspection PhpParamsInspection */
$sniffer = new \SimplePie_Content_Type_Sniffer($file);
return $sniffer->image() !== false;
}
/**
* Get HTTP or HTTPS addresses from an incomplete URL
* @param string $url the url that should be built
* @return string a string containing the http or https address
* @throws NoValidUrlException when no valid url can be returned
*/
protected function buildURL($url) {
// trim the right / from the url
$url = trim($url);
$url = rtrim($url, '/');
// check for http:// or https:// and validate URL
if (strpos($url, 'http://') === 0 || strpos($url, 'https://') === 0) {
if (filter_var($url, FILTER_VALIDATE_URL)) {
return $url;
}
} elseif (filter_var("http://" . $url, FILTER_VALIDATE_URL)) {
// maybe $url was something like www.example.com
return 'http://' . $url;
}
// no valid URL was passed in or could be built from $url
throw new NoValidUrlException();
}
}
/**
* Thrown when no valid url was found by faviconfetcher
*/
class NoValidUrlException extends \Exception {
}
|
