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