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annotate roundup/anypy/email_.py @ 5543:bc3e00a3d24b

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MySQL backend fixes for Python 3. With Python 2, text sent to and from MySQL is treated as bytes in Python. The database may be recorded by MySQL as having some other encoding (latin1 being the default in some MySQL versions - Roundup does not set an encoding explicitly, unlike in back_postgresql), but as long as MySQL's notion of the connection encoding agrees with its notion of the database encoding, no conversions actually take place and the bytes are stored and returned as-is. With Python 3, text sent to and from MySQL is treated as Python Unicode strings. When the database and connection encoding is latin1, that means the bytes stored in the database under Python 2 are interpreted as latin1 and converted from that to Unicode, producing incorrect results for any non-ASCII characters; furthermore, if trying to store new non-ASCII data in the database under Python 3, any non-latin1 characters produce errors. This patch arranges for both the connection and database character sets to be UTF-8 when using Python 3, and documents a need to export and import the database when moving from Python 2 to Python 3 with this backend.
author Joseph Myers <jsm@polyomino.org.uk>
date Sun, 16 Sep 2018 16:19:20 +0000
parents 29346d92d80c
children cacef71b3a54
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1 import re
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2 import binascii
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3 import email
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4 from email import quoprimime, base64mime
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5
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6 if str == bytes:
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7 message_from_bytes = email.message_from_string
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8 message_from_binary_file = email.message_from_file
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9 else:
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10 message_from_bytes = email.message_from_bytes
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11 message_from_binary_file = email.message_from_binary_file
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12
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13 ## please import this file if you are using the email module
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14
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15 # Match encoded-word strings in the form =?charset?q?Hello_World?=
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16 ecre = re.compile(r'''
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17 =\? # literal =?
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18 (?P<charset>[^?]*?) # non-greedy up to the next ? is the charset
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19 \? # literal ?
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20 (?P<encoding>[qb]) # either a "q" or a "b", case insensitive
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21 \? # literal ?
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22 (?P<encoded>.*?) # non-greedy up to the next ?= is the encoded string
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23 \?= # literal ?=
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24 ''', re.VERBOSE | re.IGNORECASE | re.MULTILINE)
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25
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26
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27 # Fixed header parser, see my proposed patch and discussions:
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28 # http://bugs.python.org/issue1079 "decode_header does not follow RFC 2047"
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29 # http://bugs.python.org/issue1467619 "Header.decode_header eats up spaces"
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30 # This implements the decode_header specific parts of my proposed patch
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31 # backported to python2.X
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32 def decode_header(header):
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33 """Decode a message header value without converting charset.
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34
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35 Returns a list of (string, charset) pairs containing each of the decoded
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36 parts of the header. Charset is None for non-encoded parts of the header,
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37 otherwise a lower-case string containing the name of the character set
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38 specified in the encoded string.
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39
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40 header may be a string that may or may not contain RFC2047 encoded words,
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41 or it may be a Header object.
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42
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43 An email.errors.HeaderParseError may be raised when certain decoding error
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44 occurs (e.g. a base64 decoding exception).
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45 """
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46 # If it is a Header object, we can just return the encoded chunks.
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47 if hasattr(header, '_chunks'):
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48 return [(_charset._encode(string, str(charset)), str(charset))
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49 for string, charset in header._chunks]
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50 # If no encoding, just return the header with no charset.
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51 if not ecre.search(header):
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52 return [(header, None)]
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53 # First step is to parse all the encoded parts into triplets of the form
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54 # (encoded_string, encoding, charset). For unencoded strings, the last
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55 # two parts will be None.
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56 words = []
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57 for line in header.splitlines():
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58 parts = ecre.split(line)
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59 first = True
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60 while parts:
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61 unencoded = parts.pop(0)
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62 if first:
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63 unencoded = unencoded.lstrip()
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64 first = False
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65 if unencoded:
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66 words.append((unencoded, None, None))
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67 if parts:
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68 charset = parts.pop(0).lower()
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69 encoding = parts.pop(0).lower()
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70 encoded = parts.pop(0)
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71 words.append((encoded, encoding, charset))
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72 # Now loop over words and remove words that consist of whitespace
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73 # between two encoded strings.
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74 import sys
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75 droplist = []
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76 for n, w in enumerate(words):
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77 if n>1 and w[1] and words[n-2][1] and words[n-1][0].isspace():
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78 droplist.append(n-1)
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79 for d in reversed(droplist):
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80 del words[d]
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81
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82 # The next step is to decode each encoded word by applying the reverse
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83 # base64 or quopri transformation. decoded_words is now a list of the
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84 # form (decoded_word, charset).
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85 decoded_words = []
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86 for encoded_string, encoding, charset in words:
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87 if encoding is None:
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88 # This is an unencoded word.
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89 decoded_words.append((encoded_string, charset))
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90 elif encoding == 'q':
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91 word = quoprimime.header_decode(encoded_string)
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92 decoded_words.append((word, charset))
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93 elif encoding == 'b':
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94 paderr = len(encoded_string) % 4 # Postel's law: add missing padding
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95 if paderr:
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96 encoded_string += '==='[:4 - paderr]
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97 try:
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98 word = base64mime.decode(encoded_string)
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99 except binascii.Error:
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100 raise email.errors.HeaderParseError('Base64 decoding error')
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101 else:
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102 decoded_words.append((word, charset))
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103 else:
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104 raise AssertionError('Unexpected encoding: ' + encoding)
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105 # Now convert all words to bytes and collapse consecutive runs of
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106 # similarly encoded words.
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107 collapsed = []
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108 last_word = last_charset = None
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109 for word, charset in decoded_words:
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110 if isinstance(word, str):
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111 pass
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112 if last_word is None:
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113 last_word = word
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114 last_charset = charset
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115 elif charset != last_charset:
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116 collapsed.append((last_word, last_charset))
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117 last_word = word
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118 last_charset = charset
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119 elif last_charset is None:
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120 BSPACE = b' '
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121 last_word += BSPACE + word
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122 else:
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123 last_word += word
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124 collapsed.append((last_word, last_charset))
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125 return collapsed
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126
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