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annotate roundup/anypy/email_.py @ 5460:87f22a5d65ca

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container modification while iterating over it
author Christof Meerwald <cmeerw@cmeerw.org>
date Tue, 24 Jul 2018 21:25:38 +0100
parents 45bfb4bf59c2
children b7fa56ced601
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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c426cb251bc7 Be more tolerant when parsing RFC2047 encoded mail headers.
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1 import re
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2 import binascii
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f1a2bd1dea77 issue2550877: Writing headers with the email module will use continuation_ws = ' ' now for python 2.5 and 2.6 when importing anypy.email_.
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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 ## please import this file if you are using the email module
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7
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8 # Match encoded-word strings in the form =?charset?q?Hello_World?=
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9 ecre = re.compile(r'''
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10 =\? # literal =?
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11 (?P<charset>[^?]*?) # non-greedy up to the next ? is the charset
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12 \? # literal ?
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13 (?P<encoding>[qb]) # either a "q" or a "b", case insensitive
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14 \? # literal ?
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15 (?P<encoded>.*?) # non-greedy up to the next ?= is the encoded string
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16 \?= # literal ?=
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17 ''', re.VERBOSE | re.IGNORECASE | re.MULTILINE)
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18
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19
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20 # Fixed header parser, see my proposed patch and discussions:
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21 # http://bugs.python.org/issue1079 "decode_header does not follow RFC 2047"
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22 # http://bugs.python.org/issue1467619 "Header.decode_header eats up spaces"
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23 # This implements the decode_header specific parts of my proposed patch
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24 # backported to python2.X
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25 def decode_header(header):
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26 """Decode a message header value without converting charset.
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27
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28 Returns a list of (string, charset) pairs containing each of the decoded
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29 parts of the header. Charset is None for non-encoded parts of the header,
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30 otherwise a lower-case string containing the name of the character set
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31 specified in the encoded string.
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32
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33 header may be a string that may or may not contain RFC2047 encoded words,
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34 or it may be a Header object.
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35
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36 An email.errors.HeaderParseError may be raised when certain decoding error
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37 occurs (e.g. a base64 decoding exception).
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38 """
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39 # If it is a Header object, we can just return the encoded chunks.
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40 if hasattr(header, '_chunks'):
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41 return [(_charset._encode(string, str(charset)), str(charset))
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42 for string, charset in header._chunks]
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43 # If no encoding, just return the header with no charset.
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44 if not ecre.search(header):
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45 return [(header, None)]
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46 # First step is to parse all the encoded parts into triplets of the form
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47 # (encoded_string, encoding, charset). For unencoded strings, the last
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48 # two parts will be None.
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49 words = []
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50 for line in header.splitlines():
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51 parts = ecre.split(line)
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52 first = True
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53 while parts:
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54 unencoded = parts.pop(0)
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55 if first:
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56 unencoded = unencoded.lstrip()
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57 first = False
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58 if unencoded:
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59 words.append((unencoded, None, None))
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60 if parts:
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61 charset = parts.pop(0).lower()
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62 encoding = parts.pop(0).lower()
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63 encoded = parts.pop(0)
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64 words.append((encoded, encoding, charset))
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65 # Now loop over words and remove words that consist of whitespace
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66 # between two encoded strings.
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67 import sys
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68 droplist = []
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69 for n, w in enumerate(words):
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70 if n>1 and w[1] and words[n-2][1] and words[n-1][0].isspace():
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71 droplist.append(n-1)
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72 for d in reversed(droplist):
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73 del words[d]
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74
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75 # The next step is to decode each encoded word by applying the reverse
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76 # base64 or quopri transformation. decoded_words is now a list of the
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77 # form (decoded_word, charset).
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78 decoded_words = []
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79 for encoded_string, encoding, charset in words:
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80 if encoding is None:
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81 # This is an unencoded word.
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82 decoded_words.append((encoded_string, charset))
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83 elif encoding == 'q':
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84 word = quoprimime.header_decode(encoded_string)
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85 decoded_words.append((word, charset))
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86 elif encoding == 'b':
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87 paderr = len(encoded_string) % 4 # Postel's law: add missing padding
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88 if paderr:
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89 encoded_string += '==='[:4 - paderr]
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90 try:
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91 word = base64mime.decode(encoded_string)
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92 except binascii.Error:
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93 raise email.errors.HeaderParseError('Base64 decoding error')
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94 else:
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95 decoded_words.append((word, charset))
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96 else:
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97 raise AssertionError('Unexpected encoding: ' + encoding)
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98 # Now convert all words to bytes and collapse consecutive runs of
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99 # similarly encoded words.
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100 collapsed = []
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101 last_word = last_charset = None
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102 for word, charset in decoded_words:
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103 if isinstance(word, str):
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104 pass
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105 if last_word is None:
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106 last_word = word
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107 last_charset = charset
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108 elif charset != last_charset:
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109 collapsed.append((last_word, last_charset))
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110 last_word = word
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111 last_charset = charset
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112 elif last_charset is None:
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113 BSPACE = b' '
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114 last_word += BSPACE + word
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115 else:
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116 last_word += word
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117 collapsed.append((last_word, last_charset))
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118 return collapsed
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119
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