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