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svn+ssh://pythondev@svn.python.org/python/trunk ........ r79994 | r.david.murray | 2010-04-12 10:26:06 -0400 (Mon, 12 Apr 2010) | 9 lines Issue #7472: ISO-2022 charsets now consistently use 7bit CTE. Fixed a typo in the email.encoders module so that messages output using an ISO-2022 character set will use a content-transfer-encoding of 7bit consistently. Previously if the input data had any eight bit characters the output data would get marked as 8bit even though it was actually 7bit. ........
75 lines
2 KiB
Python
75 lines
2 KiB
Python
# Copyright (C) 2001-2006 Python Software Foundation
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# Author: Barry Warsaw
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# Contact: email-sig@python.org
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"""Encodings and related functions."""
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__all__ = [
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'encode_7or8bit',
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'encode_base64',
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'encode_noop',
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'encode_quopri',
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]
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from base64 import b64encode as _bencode
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from quopri import encodestring as _encodestring
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def _qencode(s):
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enc = _encodestring(s, quotetabs=True)
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# Must encode spaces, which quopri.encodestring() doesn't do
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return enc.replace(' ', '=20')
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def encode_base64(msg):
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"""Encode the message's payload in Base64.
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Also, add an appropriate Content-Transfer-Encoding header.
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"""
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orig = msg.get_payload()
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encdata = _bencode(orig)
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msg.set_payload(encdata)
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msg['Content-Transfer-Encoding'] = 'base64'
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def encode_quopri(msg):
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"""Encode the message's payload in quoted-printable.
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Also, add an appropriate Content-Transfer-Encoding header.
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"""
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orig = msg.get_payload()
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encdata = _qencode(orig)
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msg.set_payload(encdata)
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msg['Content-Transfer-Encoding'] = 'quoted-printable'
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def encode_7or8bit(msg):
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"""Set the Content-Transfer-Encoding header to 7bit or 8bit."""
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orig = msg.get_payload()
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if orig is None:
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# There's no payload. For backwards compatibility we use 7bit
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msg['Content-Transfer-Encoding'] = '7bit'
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return
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# We play a trick to make this go fast. If encoding to ASCII succeeds, we
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# know the data must be 7bit, otherwise treat it as 8bit.
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try:
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orig.encode('ascii')
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except UnicodeError:
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# iso-2022-* is non-ASCII but still 7-bit
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charset = msg.get_charset()
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output_cset = charset and charset.output_charset
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if output_cset and output_cset.lower().startswith('iso-2022-'):
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msg['Content-Transfer-Encoding'] = '7bit'
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else:
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msg['Content-Transfer-Encoding'] = '8bit'
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else:
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msg['Content-Transfer-Encoding'] = '7bit'
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def encode_noop(msg):
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"""Do nothing."""
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