Assetic gzip filter

GzipFilter.php

<?php

namespace Assetic\Filter;

use Assetic\Asset\AssetInterface;
use Assetic\Util\ProcessBuilder;

/**
 * Runs assets through gzip.
 */
class GzipFilter implements FilterInterface
{
	private $gzipBin;
	private $compression;

	/**
	 * Constructor.
	 *
	 * @param string $gzipBin Path to the gzip binary
	 */
	public function __construct($gzipBin = '/usr/local/bin')
	{
		$this->gzipBin = $gzipBin;
	}

	public function setCompression($compression)
	{
		if( !is_numeric($compression) || (int)$compression < 1 || (int)$compression > 9 )
			throw new \RuntimeException('Compression must be an integer between 1 and 9, inclusive.');

		$this->compression = $compression;
	}

	public function filterLoad(AssetInterface $asset)
	{
	}

	public function filterDump(AssetInterface $asset)
	{
		$pb = new ProcessBuilder();
		$pb
			->inheritEnvironmentVariables()
			->add($this->gzipBin);
		;

		if (null !== $this->compression) {
			$pb->add('-' . $this->compression);
		}

		$pb->add('--no-name');

		$pb->add($input = tempnam(sys_get_temp_dir(), 'assetic_gzip'));
		file_put_contents($input, $asset->getContent());

		$proc = $pb->getProcess();
		$code = $proc->run();

		if (0 < $code) {
			unlink($input);
			throw new \RuntimeException($proc->getErrorOutput());
		}

		$asset->setContent(file_get_contents($input . '.gz'));

		unlink($input . '.gz');
	}
}