application/Thumbnailer.php

   1 <?php
   2
   3 namespace Shaarli;
   4
   5 use Shaarli\Config\ConfigManager;
   6 use WebThumbnailer\Exception\WebThumbnailerException;
   7 use WebThumbnailer\WebThumbnailer;
   8 use WebThumbnailer\Application\ConfigManager as WTConfigManager;
   9
  10 /**
  11  * Class Thumbnailer
  12  *
  13  * Utility class used to retrieve thumbnails using web-thumbnailer dependency.
  14  */
  15 class Thumbnailer
  16 {
  17     /**
  18      * @var WebThumbnailer instance.
  19      */
  20     protected $wt;
  21
  22     /**
  23      * @var ConfigManager instance.
  24      */
  25     protected $conf;
  26
  27     /**
  28      * Thumbnailer constructor.
  29      *
  30      * @param ConfigManager $conf instance.
  31      */
  32     public function __construct($conf)
  33     {
  34         $this->conf = $conf;
  35
  36         if (! $this->checkRequirements()) {
  37             $this->conf->set('thumbnails.enabled', false);
  38             $this->conf->write(true);
  39             // TODO: create a proper error handling system able to catch exceptions...
  40             die(t('php-gd extension must be loaded to use thumbnails. Thumbnails are now disabled. Please reload the page.'));
  41         }
  42
  43         $this->wt = new WebThumbnailer();
  44         WTConfigManager::addFile('inc/web-thumbnailer.json');
  45         $this->wt->maxWidth($this->conf->get('thumbnails.width'))
  46                  ->maxHeight($this->conf->get('thumbnails.height'))
  47                  ->crop(true)
  48                  ->debug($this->conf->get('dev.debug', false));
  49     }
  50
  51     /**
  52      * Retrieve a thumbnail for given URL
  53      *
  54      * @param string $url where to look for a thumbnail.
  55      *
  56      * @return bool|string The thumbnail relative cache file path, or false if none has been found.
  57      */
  58     public function get($url)
  59     {
  60         try {
  61             return $this->wt->thumbnail($url);
  62         } catch (WebThumbnailerException $e) {
  63             // Exceptions are only thrown in debug mode.
  64             error_log(get_class($e) .': '. $e->getMessage());
  65             return false;
  66         }
  67     }
  68
  69     /**
  70      * Make sure that requirements are match to use thumbnails:
  71      *   - php-gd is loaded
  72      */
  73     protected function checkRequirements()
  74     {
  75         return extension_loaded('gd');
  76     }
  77 }