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- 06.01.2017
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FileBinaryMimeTypeGuesser.php
01 <?php
02
03 /*
04 * This file is part of the Symfony package.
05 *
06 * (c) Fabien Potencier <fabien@symfony.com>
07 *
08 * For the full copyright and license information, please view the LICENSE
09 * file that was distributed with this source code.
10 */
11
12 namespace Symfony\Component\HttpFoundation\File\MimeType;
13
14 use Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException;
15 use Symfony\Component\HttpFoundation\File\Exception\AccessDeniedException;
16
17 /**
18 * Guesses the mime type with the binary "file" (only available on *nix).
19 *
20 * @author Bernhard Schussek <bschussek@gmail.com>
21 */
22 class FileBinaryMimeTypeGuesser implements MimeTypeGuesserInterface
23 {
24 private $cmd;
25
26 /**
27 * Constructor.
28 *
29 * The $cmd pattern must contain a "%s" string that will be replaced
30 * with the file name to guess.
31 *
32 * The command output must start with the mime type of the file.
33 *
34 * @param string $cmd The command to run to get the mime type of a file
35 */
36 public function __construct($cmd = 'file -b --mime %s 2>/dev/null')
37 {
38 $this->cmd = $cmd;
39 }
40
41 /**
42 * Returns whether this guesser is supported on the current OS.
43 *
44 * @return bool
45 */
46 public static function isSupported()
47 {
48 return '\\' !== DIRECTORY_SEPARATOR && function_exists('passthru') && function_exists('escapeshellarg');
49 }
50
51 /**
52 * {@inheritdoc}
53 */
54 public function guess($path)
55 {
56 if (!is_file($path)) {
57 throw new FileNotFoundException($path);
58 }
59
60 if (!is_readable($path)) {
61 throw new AccessDeniedException($path);
62 }
63
64 if (!self::isSupported()) {
65 return;
66 }
67
68 ob_start();
69
70 // need to use --mime instead of -i. see #6641
71 passthru(sprintf($this->cmd, escapeshellarg($path)), $return);
72 if ($return > 0) {
73 ob_end_clean();
74
75 return;
76 }
77
78 $type = trim(ob_get_clean());
79
80 if (!preg_match('#^([a-z0-9\-]+/[a-z0-9\-\.]+)#i', $type, $match)) {
81 // it's not a type, but an error message
82 return;
83 }
84
85 return $match[1];
86 }
87 }
88