/**
* Registers all natively provided mime type guessers.
*/
private function __construct()
{
$this->guessers = [];
if (FileInfoMimeType::isSupported()) {
$this->guessers[] = new FileInfoMimeType();
}
if (BinaryMimeType::isSupported()) {
$this->guessers[] = new BinaryMimeType();
}
}
/**
* @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 (0 == count($this->guessers)) {
$msg = 'Unable to guess the mime type as no guessers are available';
if (!FileInfoMimeType::isSupported()) {
$msg .= ' (Did you enable the php_fileinfo extension?)';
}
throw new \LogicException($msg);
}
/** @var FileInfoMimeType|BinaryMimeType $guesser */
foreach ($this->guessers as $guesser) {
if (null !== ($mimeType = $guesser->guess($path))) {
return $mimeType;
}
}
return null;
}
