JpegtranFilter.php

<?php

/*
 * This file is part of the Assetic package, an OpenSky project.
 *
 * (c) 2010-2012 OpenSky Project Inc
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Assetic\Filter;

use Assetic\Asset\AssetInterface;
use Assetic\Exception\FilterException;
use Symfony\Component\Process\ProcessBuilder;

/**
 * Runs assets through jpegtran.
 *
 * @link http://jpegclub.org/jpegtran/
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
class JpegtranFilter implements FilterInterface {
  const COPY_NONE = 'none';
  const COPY_COMMENTS = 'comments';
  const COPY_ALL = 'all';
  private $jpegtranBin;
  private $optimize;
  private $copy;
  private $progressive;
  private $restart;

  /**
   * Constructor.
   *
   * @param string $jpegtranBin Path to the jpegtran binary
   */
  public function __construct($jpegtranBin = '/usr/bin/jpegtran') {
    $this->jpegtranBin = $jpegtranBin;
  }
  public function setOptimize($optimize) {
    $this->optimize = $optimize;
  }
  public function setCopy($copy) {
    $this->copy = $copy;
  }
  public function setProgressive($progressive) {
    $this->progressive = $progressive;
  }
  public function setRestart($restart) {
    $this->restart = $restart;
  }
  public function filterLoad(AssetInterface $asset) {
  }
  public function filterDump(AssetInterface $asset) {
    $pb = new ProcessBuilder(array(
      $this->jpegtranBin,
    ));
    if ($this->optimize) {
      $pb
        ->add('-optimize');
    }
    if ($this->copy) {
      $pb
        ->add('-copy')
        ->add($this->copy);
    }
    if ($this->progressive) {
      $pb
        ->add('-progressive');
    }
    if (null !== $this->restart) {
      $pb
        ->add('-restart')
        ->add($this->restart);
    }
    $pb
      ->add($input = tempnam(sys_get_temp_dir(), 'assetic_jpegtran'));
    file_put_contents($input, $asset
      ->getContent());
    $proc = $pb
      ->getProcess();
    $code = $proc
      ->run();
    unlink($input);
    if (0 < $code) {
      throw FilterException::fromProcess($proc)
        ->setInput($asset
        ->getContent());
    }
    $asset
      ->setContent($proc
      ->getOutput());
  }

}