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annotate planemo/lib/python3.7/site-packages/future/backports/email/encoders.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 # Copyright (C) 2001-2006 Python Software Foundation
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2 # Author: Barry Warsaw
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3 # Contact: email-sig@python.org
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4
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5 """Encodings and related functions."""
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6 from __future__ import unicode_literals
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7 from __future__ import division
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8 from __future__ import absolute_import
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9 from future.builtins import str
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10
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11 __all__ = [
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12 'encode_7or8bit',
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13 'encode_base64',
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14 'encode_noop',
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15 'encode_quopri',
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16 ]
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17
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18
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19 try:
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20 from base64 import encodebytes as _bencode
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21 except ImportError:
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22 # Py2 compatibility. TODO: test this!
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23 from base64 import encodestring as _bencode
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24 from quopri import encodestring as _encodestring
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25
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26
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27 def _qencode(s):
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28 enc = _encodestring(s, quotetabs=True)
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29 # Must encode spaces, which quopri.encodestring() doesn't do
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30 return enc.replace(' ', '=20')
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31
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32
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33 def encode_base64(msg):
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34 """Encode the message's payload in Base64.
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35
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36 Also, add an appropriate Content-Transfer-Encoding header.
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37 """
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38 orig = msg.get_payload()
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39 encdata = str(_bencode(orig), 'ascii')
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40 msg.set_payload(encdata)
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41 msg['Content-Transfer-Encoding'] = 'base64'
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42
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43
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44 def encode_quopri(msg):
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45 """Encode the message's payload in quoted-printable.
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46
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47 Also, add an appropriate Content-Transfer-Encoding header.
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48 """
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49 orig = msg.get_payload()
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50 encdata = _qencode(orig)
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51 msg.set_payload(encdata)
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52 msg['Content-Transfer-Encoding'] = 'quoted-printable'
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53
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54
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55 def encode_7or8bit(msg):
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56 """Set the Content-Transfer-Encoding header to 7bit or 8bit."""
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57 orig = msg.get_payload()
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58 if orig is None:
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59 # There's no payload. For backwards compatibility we use 7bit
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60 msg['Content-Transfer-Encoding'] = '7bit'
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61 return
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62 # We play a trick to make this go fast. If encoding/decode to ASCII
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63 # succeeds, we know the data must be 7bit, otherwise treat it as 8bit.
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64 try:
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65 if isinstance(orig, str):
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66 orig.encode('ascii')
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67 else:
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68 orig.decode('ascii')
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69 except UnicodeError:
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70 charset = msg.get_charset()
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71 output_cset = charset and charset.output_charset
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72 # iso-2022-* is non-ASCII but encodes to a 7-bit representation
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73 if output_cset and output_cset.lower().startswith('iso-2022-'):
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74 msg['Content-Transfer-Encoding'] = '7bit'
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75 else:
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76 msg['Content-Transfer-Encoding'] = '8bit'
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77 else:
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78 msg['Content-Transfer-Encoding'] = '7bit'
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79 if not isinstance(orig, str):
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80 msg.set_payload(orig.decode('ascii', 'surrogateescape'))
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81
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82
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83 def encode_noop(msg):
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84 """Do nothing."""
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85 # Well, not quite *nothing*: in Python3 we have to turn bytes into a string
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86 # in our internal surrogateescaped form in order to keep the model
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87 # consistent.
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88 orig = msg.get_payload()
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89 if not isinstance(orig, str):
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90 msg.set_payload(orig.decode('ascii', 'surrogateescape'))