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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Mime;
use Symfony\Component\Mime\Exception\InvalidArgumentException;
use Symfony\Component\Mime\Exception\LogicException;
/**
* Guesses the MIME type with the binary "file" (only available on *nix).
*
* @author Bernhard Schussek <bschussek@gmail.com>
*
* @experimental in 4.3
*/
class FileBinaryMimeTypeGuesser implements MimeTypeGuesserInterface
{
private $cmd;
/**
* The $cmd pattern must contain a "%s" string that will be replaced
* with the file name to guess.
*
* The command output must start with the MIME type of the file.
*
* @param string $cmd The command to run to get the MIME type of a file
*/
public function __construct(string $cmd = 'file -b --mime %s 2>/dev/null')
{
$this->cmd = $cmd;
}
/**
* {@inheritdoc}
*/
public function isGuesserSupported(): bool
{
static $supported = null;
if (null !== $supported) {
return $supported;
}
if ('\\' === \DIRECTORY_SEPARATOR || !\function_exists('passthru') || !\function_exists('escapeshellarg')) {
return $supported = false;
}
ob_start();
passthru('command -v file', $exitStatus);
$binPath = trim(ob_get_clean());
return $supported = 0 === $exitStatus && '' !== $binPath;
}
/**
* {@inheritdoc}
*/
public function guessMimeType(string $path): ?string
{
if (!is_file($path) || !is_readable($path)) {
throw new InvalidArgumentException(sprintf('The "%s" file does not exist or is not readable.', $path));
}
if (!$this->isGuesserSupported()) {
throw new LogicException(sprintf('The "%s" guesser is not supported.', __CLASS__));
}
ob_start();
// need to use --mime instead of -i. see #6641
passthru(sprintf($this->cmd, escapeshellarg($path)), $return);
if ($return > 0) {
ob_end_clean();
return null;
}
$type = trim(ob_get_clean());
if (!preg_match('#^([a-z0-9\-]+/[a-z0-9\-\.]+)#i', $type, $match)) {
// it's not a type, but an error message
return null;
}
return $match[1];
}
}
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