* * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\HttpFoundation\File\MimeType; use Symfony\Component\HttpFoundation\File\Exception\AccessDeniedException; use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException; /** * Guesses the mime type with the binary "file" (only available on *nix). * * @author Bernhard Schussek */ 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 $cmd The command to run to get the mime type of a file */ public function __construct($cmd = 'file -b --mime -- %s 2>/dev/null') { $this->cmd = $cmd; } /** * Returns whether this guesser is supported on the current OS. * * @return bool */ public static function isSupported() { 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 && '' !== $binPath; } /** * {@inheritdoc} */ public function guess($path) { if (!is_file($path)) { throw new FileNotFoundException($path); } if (!is_readable($path)) { throw new AccessDeniedException($path); } if (!self::isSupported()) { return; } ob_start(); // need to use --mime instead of -i. see #6641 passthru(sprintf($this->cmd, escapeshellarg((0 === strpos($path, '-') ? './' : '').$path)), $return); if ($return > 0) { ob_end_clean(); return; } $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; } return $match[1]; } }