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test_client_resource.py

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  • _base64.py 1.10 KiB
    # 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"-_")