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# Copyright 2014, 2015 OpenMarket Ltd
# Copyright 2021 The Matrix.org Foundation C.I.C.
#
# 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
def encode_base64(input_bytes: bytes, urlsafe: bool = False) -> str:
"""Encode bytes as an unpadded base64 string."""
if urlsafe:
encode = base64.urlsafe_b64encode
else:
encode = base64.b64encode
output_bytes = encode(input_bytes)
output_string = output_bytes.decode("ascii")
return output_string.rstrip("=")
def decode_base64(input_string: str) -> bytes:
"""Decode an unpadded standard or urlsafe base64 string to bytes."""
input_bytes = input_string.encode("ascii")
input_len = len(input_bytes)
padding = b"=" * (3 - ((input_len + 3) % 4))
# Passing altchars here allows decoding both standard and urlsafe base64
output_bytes = base64.b64decode(input_bytes + padding, altchars=b"-_")
return output_bytes
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