1: <?php
 2: 
 3: /*
 4:  * This file is part of the Symfony package.
 5:  *
 6:  * (c) Fabien Potencier <fabien@symfony.com>
 7:  *
 8:  * For the full copyright and license information, please view the LICENSE
 9:  * 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: