ac5787d0e4
The current change made in de68f08d37 breaks cinder and other projects that were expecting a TypeError, so for now and to keep those projects operating translate the py3.x exception from binascii into a type error to prefer consistency with existing code. Change-Id: I4575ea3dad51be9bb2278eb0bfa31cef54c300d5
93 lines
2.7 KiB
Python
93 lines
2.7 KiB
Python
# Copyright 2015 Red Hat
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Utilities to encode and decode Base64.
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.. versionadded:: 1.10
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"""
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from __future__ import absolute_import
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import base64
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import binascii
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import six
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def encode_as_bytes(s, encoding='utf-8'):
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"""Encode a string using Base64.
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If *s* is a text string, first encode it to *encoding* (UTF-8 by default).
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:param s: bytes or text string to be encoded
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:param encoding: encoding used to encode *s* if it's a text string
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:returns: Base64 encoded byte string (bytes)
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Use encode_as_text() to get the Base64 encoded string as text.
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"""
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if isinstance(s, six.text_type):
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s = s.encode(encoding)
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return base64.b64encode(s)
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def encode_as_text(s, encoding='utf-8'):
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"""Encode a string using Base64.
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If *s* is a text string, first encode it to *encoding* (UTF-8 by default).
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:param s: bytes or text string to be encoded
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:param encoding: encoding used to encode *s* if it's a text string
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:returns: Base64 encoded text string (Unicode)
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Use encode_as_bytes() to get the Base64 encoded string as bytes.
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"""
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encoded = encode_as_bytes(s, encoding=encoding)
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return encoded.decode('ascii')
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def decode_as_bytes(encoded):
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"""Decode a Base64 encoded string.
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:param encoded: bytes or text Base64 encoded string to be decoded
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:returns: decoded bytes string (bytes)
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Use decode_as_text() to get the decoded string as text.
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A TypeError is raised if the input is invalid (or incorrectly padded).
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"""
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if isinstance(encoded, bytes):
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encoded = encoded.decode('ascii')
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try:
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return base64.b64decode(encoded)
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except binascii.Error as e:
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# Transform this exception for consistency.
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raise TypeError(str(e))
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def decode_as_text(encoded, encoding='utf-8'):
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"""Decode a Base64 encoded string.
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Decode the Base64 string and then decode the result from *encoding*
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(UTF-8 by default).
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:param encoded: bytes or text Base64 encoded string to be decoded
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:returns: decoded text string (bytes)
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Use decode_as_bytes() to get the decoded string as bytes.
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"""
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decoded = decode_as_bytes(encoded)
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return decoded.decode(encoding)
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