Function extract_header

authlib/jose/util.py:9–22

(header_segment, error_cls)

def extract_header(header_segment, error_cls):
    if len(header_segment) > 256000:
        raise ValueError("Value of header is too long")

    header_data = extract_segment(header_segment, error_cls, "header")

    try:
        header = json_loads(header_data.decode("utf-8"))
    except ValueError as e:
        raise error_cls(f"Invalid header string: {e}") from e

    if not isinstance(header, dict):
        raise error_cls("Header must be a json object")
    return header


def extract_segment(segment, error_cls, name="payload"):