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<?php
namespace PicoFeed\Reader;
use DOMXpath;
use PicoFeed\Client\Client;
use PicoFeed\Client\ClientException;
use PicoFeed\Client\Url;
use PicoFeed\Config\Config;
use PicoFeed\Logging\Logger;
use PicoFeed\Parser\XmlParser;
/**
* Favicon class.
*
* https://en.wikipedia.org/wiki/Favicon
*
* @author Frederic Guillot
*/
class Favicon
{
/**
* Valid types for favicon (supported by browsers).
*
* @var array
*/
private $types = array(
'image/png',
'image/gif',
'image/x-icon',
'image/jpeg',
'image/jpg',
'image/svg+xml'
);
/**
* Config class instance.
*
* @var \PicoFeed\Config\Config
*/
private $config;
/**
* Icon binary content.
*
* @var string
*/
private $content = '';
/**
* Icon content type.
*
* @var string
*/
private $content_type = '';
/**
* Constructor.
*
* @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).
*
* @return string
*/
public function getContent()
{
return $this->content;
}
/**
* Get the icon file type (available only after the download).
*
* @return string
*/
public function getType()
{
foreach ($this->types as $type) {
if (strpos($this->content_type, $type) === 0) {
return $type;
}
}
return 'image/x-icon';
}
/**
* Get data URI (http://en.wikipedia.org/wiki/Data_URI_scheme).
*
* @return string
*/
public function getDataUri()
{
if (empty($this->content)) {
return '';
}
return sprintf(
'data:%s;base64,%s',
$this->getType(),
base64_encode($this->content)
);
}
/**
* Download and check if a resource exists.
*
* @param string $url URL
*
* @return \PicoFeed\Client Client instance
*/
public function download($url)
{
$client = Client::getInstance();
$client->setConfig($this->config);
Logger::setMessage(get_called_class().' Download => '.$url);
try {
$client->execute($url);
} catch (ClientException $e) {
Logger::setMessage(get_called_class().' Download Failed => '.$e->getMessage());
}
return $client;
}
/**
* Check if a remote file exists.
*
* @param string $url URL
*
* @return bool
*/
public function exists($url)
{
return $this->download($url)->getContent() !== '';
}
/**
* Get the icon link for a website.
*
* @param string $website_link URL
* @param string $favicon_link optional URL
*
* @return string
*/
public function find($website_link, $favicon_link = '')
{
$website = new Url($website_link);
if ($favicon_link !== '') {
$icons = array($favicon_link);
} else {
$icons = $this->extract($this->download($website->getBaseUrl('/'))->getContent());
$icons[] = $website->getBaseUrl('/favicon.ico');
}
foreach ($icons as $icon_link) {
$icon_link = Url::resolve($icon_link, $website);
$resource = $this->download($icon_link);
$this->content = $resource->getContent();
$this->content_type = $resource->getContentType();
if ($this->content !== '') {
return $icon_link;
} elseif ($favicon_link !== '') {
return $this->find($website_link);
}
}
return '';
}
/**
* Extract the icon links from the HTML.
*
* @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 = $xpath->query('//link[@rel="icon" or @rel="shortcut icon" or @rel="icon shortcut"]');
for ($i = 0; $i < $elements->length; ++$i) {
$icons[] = $elements->item($i)->getAttribute('href');
}
return $icons;
}
}
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