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"""`JOSE Base64`_ is defined as:
- URL-safe Base64
- padding stripped
.. _`JOSE Base64`:
https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-37#appendix-C
.. Do NOT try to call this module "base64", as it will "shadow" the
standard library.
"""
import base64
from typing import Union
def b64encode(data: bytes) -> bytes:
"""JOSE Base64 encode.
:param data: Data to be encoded.
:type data: bytes
:returns: JOSE Base64 string.
:rtype: bytes
:raises TypeError: if ``data`` is of incorrect type
"""
if not isinstance(data, bytes):
raise TypeError('argument should be bytes')
return base64.urlsafe_b64encode(data).rstrip(b'=')
def b64decode(data: Union[bytes, str]) -> bytes:
"""JOSE Base64 decode.
:param data: Base64 string to be decoded. If it's unicode, then
only ASCII characters are allowed.
:type data: bytes or unicode
:returns: Decoded data.
:rtype: bytes
:raises TypeError: if input is of incorrect type
:raises ValueError: if input is unicode with non-ASCII characters
"""
if isinstance(data, str):
try:
data = data.encode('ascii')
except UnicodeEncodeError:
raise ValueError(
'unicode argument should contain only ASCII characters')
elif not isinstance(data, bytes):
raise TypeError('argument should be a str or unicode')
return base64.urlsafe_b64decode(data + b'=' * (4 - (len(data) % 4)))