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<?php
namespace PicoFeed\Client;
use DOMXpath;
use PicoFeed\Config\Config;
use PicoFeed\Logging\Logger;
use PicoFeed\Parser\XmlParser;
/**
* Favicon class
*
* https://en.wikipedia.org/wiki/Favicon
*
* @author Frederic Guillot
* @package Client
*/
class Favicon
{
/**
* Config class instance
*
* @access private
* @var \PicoFeed\Config\Config
*/
private $config;
/**
* Icon content
*
* @access private
* @var string
*/
private $content = '';
/**
* Constructor
*
* @access public
* @param \PicoFeed\Config\Config $config Config class instance
*/
public function __construct(Config $config = null)
{
$this->config = $config ?: new Config;
}
/**
* Get the icon file content (available only after the download)
*
* @access public
* @return string
*/
public function getContent()
{
return $this->content;
}
/**
* Download and check if a resource exists
*
* @access public
* @param string $url URL
* @return string Resource content
*/
public function download($url)
{
try {
Logger::setMessage(get_called_class().' Download => '.$url);
$client = Client::getInstance();
$client->setConfig($this->config);
$client->execute($url);
return $client->getContent();
}
catch (ClientException $e) {
return '';
}
}
/**
* Check if a remote file exists
*
* @access public
* @param string $url URL
* @return boolean
*/
public function exists($url)
{
return $this->download($url) !== '';
}
/**
* Get the icon link for a website
*
* @access public
* @param string $website_link URL
* @return string
*/
public function find($website_link)
{
$website = new Url($website_link);
$icons = $this->extract($this->download($website->getBaseUrl('/')));
$icons[] = $website->getBaseUrl('/favicon.ico');
foreach ($icons as $icon_link) {
$icon_link = $this->convertLink($website, new Url($icon_link));
$this->content = $this->download($icon_link);
if ($this->content !== '') {
return $icon_link;
}
}
return '';
}
/**
* Convert icon links to absolute url
*
* @access public
* @param \PicoFeed\Client\Url $website Website url
* @param \PicoFeed\Client\Url $icon Icon url
* @return string
*/
public function convertLink(Url $website, Url $icon)
{
$base_url = '';
if ($icon->isRelativeUrl()) {
$base_url = $website->getBaseUrl();
}
else if ($icon->isProtocolRelative()) {
$icon->setScheme($website->getScheme());
}
return $icon->getAbsoluteUrl($base_url);
}
/**
* Extract the icon links from the HTML
*
* @access public
* @param string $html HTML
* @return array
*/
public function extract($html)
{
$icons = array();
if (empty($html)) {
return $icons;
}
$dom = XmlParser::getHtmlDocument($html);
$xpath = new DOMXpath($dom);
$elements = $xpath->query("//link[contains(@rel, 'icon') and not(contains(@rel, 'apple'))]");
for ($i = 0; $i < $elements->length; $i++) {
$icons[] = $elements->item($i)->getAttribute('href');
}
return $icons;
}
}
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