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# Copyright 2014, 2015 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import base64
__version__ = "1.1.0"
def encode_base64(input_bytes, urlsafe=False):
"""Encode bytes as a base64 string without any padding."""
encode = base64.urlsafe_b64encode if urlsafe else base64.b64encode
output_bytes = encode(input_bytes)
output_string = output_bytes.decode("ascii")
return output_string.rstrip(u"=")
def decode_base64(input_string):
"""Decode a base64 string to bytes inferring padding from the length of the
string."""
input_bytes = input_string.encode("ascii")
input_len = len(input_bytes)
padding = b"=" * (3 - ((input_len + 3) % 4))
decode = base64.b64decode
if u'-' in input_string or u'_' in input_string:
decode = base64.urlsafe_b64decode
output_bytes = decode(input_bytes + padding)
return output_bytes
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