def validate_and_format_range_headers()

in azure/multiapi/storagev2/filedatalake/v2021_08_06/_shared/request_handlers.py [0:0]

• 27 lines of code
• 18 McCabe index (conditional complexity)

def validate_and_format_range_headers(
        start_range, end_range, start_range_required=True,
        end_range_required=True, check_content_md5=False, align_to_page=False):
    # If end range is provided, start range must be provided
    if (start_range_required or end_range is not None) and start_range is None:
        raise ValueError("start_range value cannot be None.")
    if end_range_required and end_range is None:
        raise ValueError("end_range value cannot be None.")

    # Page ranges must be 512 aligned
    if align_to_page:
        if start_range is not None and start_range % 512 != 0:
            raise ValueError("Invalid page blob start_range: {0}. "
                             "The size must be aligned to a 512-byte boundary.".format(start_range))
        if end_range is not None and end_range % 512 != 511:
            raise ValueError("Invalid page blob end_range: {0}. "
                             "The size must be aligned to a 512-byte boundary.".format(end_range))

    # Format based on whether end_range is present
    range_header = None
    if end_range is not None:
        range_header = 'bytes={0}-{1}'.format(start_range, end_range)
    elif start_range is not None:
        range_header = "bytes={0}-".format(start_range)

    # Content MD5 can only be provided for a complete range less than 4MB in size
    range_validation = None
    if check_content_md5:
        if start_range is None or end_range is None:
            raise ValueError("Both start and end range requied for MD5 content validation.")
        if end_range - start_range > 4 * 1024 * 1024:
            raise ValueError("Getting content MD5 for a range greater than 4MB is not supported.")
        range_validation = 'true'

    return range_header, range_validation