util.py 文件源码

def validate_png(filename):
    """Validate file as a png image. Throws a DCOSException if it is not an PNG

    :param filename: path to the image
    :type filename: str
    :rtype: None
    """

    try:
        png.Reader(filename=filename).validate_signature()
    except Exception as e:
        logger.exception(e)
        raise DCOSException(
            'Unable to validate [{}] as a PNG file'.format(filename))