130 lines
3.4 KiB
PHP
130 lines
3.4 KiB
PHP
<?php
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namespace Shaarli;
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use Shaarli\Config\ConfigManager;
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use WebThumbnailer\Exception\WebThumbnailerException;
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use WebThumbnailer\WebThumbnailer;
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use WebThumbnailer\Application\ConfigManager as WTConfigManager;
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/**
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* Class Thumbnailer
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*
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* Utility class used to retrieve thumbnails using web-thumbnailer dependency.
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*/
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class Thumbnailer
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{
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const COMMON_MEDIA_DOMAINS = [
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'imgur.com',
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'flickr.com',
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'youtube.com',
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'wikimedia.org',
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'redd.it',
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'gfycat.com',
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'media.giphy.com',
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'twitter.com',
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'twimg.com',
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'instagram.com',
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'pinterest.com',
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'pinterest.fr',
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'tumblr.com',
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'deviantart.com',
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];
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const MODE_ALL = 'all';
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const MODE_COMMON = 'common';
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const MODE_NONE = 'none';
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/**
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* @var WebThumbnailer instance.
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*/
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protected $wt;
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/**
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* @var ConfigManager instance.
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*/
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protected $conf;
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/**
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* Thumbnailer constructor.
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*
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* @param ConfigManager $conf instance.
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*/
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public function __construct($conf)
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{
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$this->conf = $conf;
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if (! $this->checkRequirements()) {
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$this->conf->set('thumbnails.enabled', false);
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$this->conf->write(true);
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// TODO: create a proper error handling system able to catch exceptions...
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die(t(
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'php-gd extension must be loaded to use thumbnails. '
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.'Thumbnails are now disabled. Please reload the page.'
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));
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}
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$this->wt = new WebThumbnailer();
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WTConfigManager::addFile('inc/web-thumbnailer.json');
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$this->wt->maxWidth($this->conf->get('thumbnails.width'))
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->maxHeight($this->conf->get('thumbnails.height'))
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->crop(true)
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->debug($this->conf->get('dev.debug', false));
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}
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/**
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* Retrieve a thumbnail for given URL
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*
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* @param string $url where to look for a thumbnail.
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*
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* @return bool|string The thumbnail relative cache file path, or false if none has been found.
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*/
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public function get($url)
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{
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if ($this->conf->get('thumbnails.mode') === self::MODE_COMMON
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&& ! $this->isCommonMediaOrImage($url)
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) {
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return false;
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}
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try {
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return $this->wt->thumbnail($url);
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} catch (WebThumbnailerException $e) {
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// Exceptions are only thrown in debug mode.
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error_log(get_class($e) . ': ' . $e->getMessage());
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}
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return false;
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}
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/**
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* We check weather the given URL is from a common media domain,
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* or if the file extension is an image.
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*
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* @param string $url to check
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*
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* @return bool true if it's an image or from a common media domain, false otherwise.
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*/
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public function isCommonMediaOrImage($url)
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{
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foreach (self::COMMON_MEDIA_DOMAINS as $domain) {
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if (strpos($url, $domain) !== false) {
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return true;
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}
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}
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if (endsWith($url, '.jpg') || endsWith($url, '.png') || endsWith($url, '.jpeg')) {
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return true;
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}
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return false;
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}
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/**
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* Make sure that requirements are match to use thumbnails:
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* - php-gd is loaded
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*/
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protected function checkRequirements()
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{
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return extension_loaded('gd');
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}
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}
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