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