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# Copyright 2019 PrivateStorage.io, LLC
#
# 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.
"""
This module implements base64 encoding-related functionality.
"""
from __future__ import (
absolute_import,
)
from re import (
compile as _compile,
)
from binascii import (
Error,
)
from base64 import (
b64decode as _b64decode,
)
_b64decode_validator = _compile(b'^[A-Za-z0-9-_]*={0,2}$')
def urlsafe_b64decode(s):
"""
Like ``base64.b64decode`` but with validation.
"""
if not _b64decode_validator.match(s):
raise Error('Non-base64 digit found')
return _b64decode(s, altchars=b"-_")