Function decode_part

msal/oauth2cli/oidc.py:14–34

Decode a part of the JWT. JWT is encoded by padding-less base64url, based on `JWS specs `_. :param encoding: If you are going to decode the first 2 parts of a JWT, i.e. the header or the payload, the default value "utf-8"

(raw, encoding="utf-8")

logger = logging.getLogger(__name__)

def decode_part(raw, encoding="utf-8"):
    """Decode a part of the JWT.

    JWT is encoded by padding-less base64url,
    based on `JWS specs <https://tools.ietf.org/html/rfc7515#appendix-C>`_.

    :param encoding:
        If you are going to decode the first 2 parts of a JWT, i.e. the header
        or the payload, the default value "utf-8" would work fine.
        If you are going to decode the last part i.e. the signature part,
        it is a binary string so you should use `None` as encoding here.
    """
    raw += '=' * (-len(raw) % 4)  # https://stackoverflow.com/a/32517907/728675
    raw = str(
        # On Python 2.7, argument of urlsafe_b64decode must be str, not unicode.
        # This is not required on Python 3.
        raw)
    output = base64.urlsafe_b64decode(raw)
    if encoding:
        output = output.decode(encoding)
    return output

base64decode = decode_part  # Obsolete. For backward compatibility only.