GoogleHandler::getInternalMimeTypeByExtension

static function getInternalMimeTypeByExtension($ext)
{
	$ext = trim($ext, '.');
	$googleMimeTypes = array(
		'docx' => 'application/vnd.google-apps.document',
		'xlsx' => 'application/vnd.google-apps.spreadsheet',
		'pptx' => 'application/vnd.google-apps.presentation',
		'doc' => 'application/vnd.google-apps.document',
		'xls' => 'application/vnd.google-apps.spreadsheet',
		'ppt' => 'application/vnd.google-apps.presentation',
	);

	return isset($googleMimeTypes[$ext])? $googleMimeTypes[$ext] : null;
}