MimeTypeGuesser.php in Zircon Profile 8.0

Namespace

Symfony\Component\HttpFoundation\File\MimeType

File

vendor/symfony/http-foundation/File/MimeType/MimeTypeGuesser.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <[e-mail]>
 *
 * 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\FileNotFoundException;
use Symfony\Component\HttpFoundation\File\Exception\AccessDeniedException;

/**
 * A singleton mime type guesser.
 *
 * By default, all mime type guessers provided by the framework are installed
 * (if available on the current OS/PHP setup).
 *
 * You can register custom guessers by calling the register() method on the
 * singleton instance. Custom guessers are always called before any default ones.
 *
 *     $guesser = MimeTypeGuesser::getInstance();
 *     $guesser->register(new MyCustomMimeTypeGuesser());
 *
 * If you want to change the order of the default guessers, just re-register your
 * preferred one as a custom one. The last registered guesser is preferred over
 * previously registered ones.
 *
 * Re-registering a built-in guesser also allows you to configure it:
 *
 *     $guesser = MimeTypeGuesser::getInstance();
 *     $guesser->register(new FileinfoMimeTypeGuesser('/path/to/magic/file'));
 *
 * @author Bernhard Schussek <[e-mail]>
 */
class MimeTypeGuesser implements MimeTypeGuesserInterface {

  /**
   * The singleton instance.
   *
   * @var MimeTypeGuesser
   */
  private static $instance = null;

  /**
   * All registered MimeTypeGuesserInterface instances.
   *
   * @var array
   */
  protected $guessers = array();

  /**
   * Returns the singleton instance.
   *
   * @return MimeTypeGuesser
   */
  public static function getInstance() {
    if (null === self::$instance) {
      self::$instance = new self();
    }
    return self::$instance;
  }

  /**
   * Resets the singleton instance.
   */
  public static function reset() {
    self::$instance = null;
  }

  /**
   * Registers all natively provided mime type guessers.
   */
  private function __construct() {
    if (FileBinaryMimeTypeGuesser::isSupported()) {
      $this
        ->register(new FileBinaryMimeTypeGuesser());
    }
    if (FileinfoMimeTypeGuesser::isSupported()) {
      $this
        ->register(new FileinfoMimeTypeGuesser());
    }
  }

  /**
   * Registers a new mime type guesser.
   *
   * When guessing, this guesser is preferred over previously registered ones.
   *
   * @param MimeTypeGuesserInterface $guesser
   */
  public function register(MimeTypeGuesserInterface $guesser) {
    array_unshift($this->guessers, $guesser);
  }

  /**
   * Tries to guess the mime type of the given file.
   *
   * The file is passed to each registered mime type guesser in reverse order
   * of their registration (last registered is queried first). Once a guesser
   * returns a value that is not NULL, this method terminates and returns the
   * value.
   *
   * @param string $path The path to the file
   *
   * @return string The mime type or NULL, if none could be guessed
   *
   * @throws \LogicException
   * @throws FileNotFoundException
   * @throws AccessDeniedException
   */
  public function guess($path) {
    if (!is_file($path)) {
      throw new FileNotFoundException($path);
    }
    if (!is_readable($path)) {
      throw new AccessDeniedException($path);
    }
    if (!$this->guessers) {
      $msg = 'Unable to guess the mime type as no guessers are available';
      if (!FileinfoMimeTypeGuesser::isSupported()) {
        $msg .= ' (Did you enable the php_fileinfo extension?)';
      }
      throw new \LogicException($msg);
    }
    foreach ($this->guessers as $guesser) {
      if (null !== ($mimeType = $guesser
        ->guess($path))) {
        return $mimeType;
      }
    }
  }

}

Classes

Name	Description
MimeTypeGuesser	A singleton mime type guesser.