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b64.py
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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 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: bytes) -> 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)))