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