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- 28.08.2024
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FileBinaryMimeTypeGuesser.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\HttpFoundation\File\MimeType;
013
014 use Symfony\Component\HttpFoundation\File\Exception\AccessDeniedException;
015 use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
016
017 /**
018 * Guesses the mime type with the binary "file" (only available on *nix).
019 *
020 * @author Bernhard Schussek <bschussek@gmail.com>
021 */
022 class FileBinaryMimeTypeGuesser implements MimeTypeGuesserInterface
023 {
024 private $cmd;
025
026 /**
027 * The $cmd pattern must contain a "%s" string that will be replaced
028 * with the file name to guess.
029 *
030 * The command output must start with the mime type of the file.
031 *
032 * @param string $cmd The command to run to get the mime type of a file
033 */
034 public function __construct($cmd = 'file -b --mime -- %s 2>/dev/null')
035 {
036 $this->cmd = $cmd;
037 }
038
039 /**
040 * Returns whether this guesser is supported on the current OS.
041 *
042 * @return bool
043 */
044 public static function isSupported()
045 {
046 static $supported = null;
047
048 if (null !== $supported) {
049 return $supported;
050 }
051
052 if ('\\' === \DIRECTORY_SEPARATOR || !\function_exists('passthru') || !\function_exists('escapeshellarg')) {
053 return $supported = false;
054 }
055
056 ob_start();
057 passthru('command -v file', $exitStatus);
058 $binPath = trim(ob_get_clean());
059
060 return $supported = 0 === $exitStatus && '' !== $binPath;
061 }
062
063 /**
064 * {@inheritdoc}
065 */
066 public function guess($path)
067 {
068 if (!is_file($path)) {
069 throw new FileNotFoundException($path);
070 }
071
072 if (!is_readable($path)) {
073 throw new AccessDeniedException($path);
074 }
075
076 if (!self::isSupported()) {
077 return null;
078 }
079
080 ob_start();
081
082 // need to use --mime instead of -i. see #6641
083 passthru(sprintf($this->cmd, escapeshellarg((0 === strpos($path, '-') ? './' : '').$path)), $return);
084 if ($return > 0) {
085 ob_end_clean();
086
087 return null;
088 }
089
090 $type = trim(ob_get_clean());
091
092 if (!preg_match('#^([a-z0-9\-]+/[a-z0-9\-\+\.]+)#i', $type, $match)) {
093 // it's not a type, but an error message
094 return null;
095 }
096
097 return $match[1];
098 }
099 }
100