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annotate roundup/rfc2822.py @ 2005:fc52d57c6c3e

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documentation cleanup
author Richard Jones <richard@users.sourceforge.net>
date Wed, 11 Feb 2004 23:55:10 +0000
parents ea1afeb64b45
children be047db3dd3d
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2005
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1 """Some rfc822 functions taken from the new (python2.3) "email" module.
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2 """
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3 __docformat__ = 'restructuredtext'
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4
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5 import re
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6 from string import letters, digits
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7 from binascii import b2a_base64, a2b_base64
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8
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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)
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18
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19 hqre = re.compile(r'^[A-z0-9!"#$%%&\'()*+,-./:;<=>?@\[\]^_`{|}~ ]+$')
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20
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21 def base64_decode(s, convert_eols=None):
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22 """Decode a raw base64 string.
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23
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24 If convert_eols is set to a string value, all canonical email linefeeds,
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25 e.g. "\\r\\n", in the decoded text will be converted to the value of
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26 convert_eols. os.linesep is a good choice for convert_eols if you are
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27 decoding a text attachment.
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28
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29 This function does not parse a full MIME header value encoded with
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30 base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
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31 level email.Header class for that functionality.
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32
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33 Taken from 'email' module
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34 """
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35 if not s:
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36 return s
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37
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38 dec = a2b_base64(s)
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39 if convert_eols:
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40 return dec.replace(CRLF, convert_eols)
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41 return dec
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42
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43 def unquote_match(match):
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44 """Turn a match in the form ``=AB`` to the ASCII character with value
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45 0xab.
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46
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47 Taken from 'email' module
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48 """
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49 s = match.group(0)
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50 return chr(int(s[1:3], 16))
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51
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52 def qp_decode(s):
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53 """Decode a string encoded with RFC 2045 MIME header 'Q' encoding.
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54
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55 This function does not parse a full MIME header value encoded with
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56 quoted-printable (like =?iso-8895-1?q?Hello_World?=) -- please use
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57 the high level email.Header class for that functionality.
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58
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59 Taken from 'email' module
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60 """
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61 s = s.replace('_', ' ')
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62 return re.sub(r'=\w{2}', unquote_match, s)
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63
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64 def _decode_header(header):
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65 """Decode a message header value without converting charset.
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66
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67 Returns a list of (decoded_string, charset) pairs containing each of the
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68 decoded parts of the header. Charset is None for non-encoded parts of the
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69 header, otherwise a lower-case string containing the name of the character
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70 set specified in the encoded string.
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71
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72 Taken from 'email' module
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73 """
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74 # If no encoding, just return the header
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75 header = str(header)
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76 if not ecre.search(header):
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77 return [(header, None)]
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78
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79 decoded = []
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80 dec = ''
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81 for line in header.splitlines():
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82 # This line might not have an encoding in it
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83 if not ecre.search(line):
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84 decoded.append((line, None))
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85 continue
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86
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87 parts = ecre.split(line)
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88 while parts:
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89 unenc = parts.pop(0)
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90 if unenc:
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91 if unenc.strip():
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92 decoded.append((unenc, None))
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93 if parts:
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94 charset, encoding = [s.lower() for s in parts[0:2]]
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95 encoded = parts[2]
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96 dec = ''
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97 if encoding == 'q':
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98 dec = qp_decode(encoded)
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99 elif encoding == 'b':
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100 dec = base64_decode(encoded)
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101 else:
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102 dec = encoded
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103
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104 if decoded and decoded[-1][1] == charset:
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105 decoded[-1] = (decoded[-1][0] + dec, decoded[-1][1])
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106 else:
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107 decoded.append((dec, charset))
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108 del parts[0:3]
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109 return decoded
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110
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111 def decode_header(hdr):
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112 """ Decodes rfc2822 encoded header and return utf-8 encoded string
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113 """
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114 if not hdr:
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115 return None
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116 outs = u""
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117 for section in _decode_header(hdr):
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118 charset = unaliasCharset(section[1])
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119 outs += unicode(section[0], charset or 'iso-8859-1', 'replace')
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120 return outs.encode('utf-8')
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121
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122 def encode_header(header):
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123 """ Will encode in quoted-printable encoding only if header
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124 contains non latin characters
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125 """
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126
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127 # Return empty headers unchanged
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128 if not header:
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129 return header
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130
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131 # return plain header if it is not contains non-ascii characters
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132 if hqre.match(header):
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133 return header
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134
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135 charset = 'utf-8'
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136 quoted = ''
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137 #max_encoded = 76 - len(charset) - 7
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138 for c in header:
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139 # Space may be represented as _ instead of =20 for readability
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140 if c == ' ':
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141 quoted += '_'
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142 # These characters can be included verbatim
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143 elif hqre.match(c):
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144 quoted += c
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145 # Otherwise, replace with hex value like =E2
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146 else:
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147 quoted += "=%02X" % ord(c)
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148 plain = 0
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149
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150 return '=?%s?q?%s?=' % (charset, quoted)
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151
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152 def unaliasCharset(charset):
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153 if charset:
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154 return charset.lower().replace("windows-", 'cp')
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155 #return charset_table.get(charset.lower(), charset)
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156 return None
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157
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158 def test():
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159 print encode_header("Contrary, Mary")
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160 #print unaliasCharset('Windows-1251')
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161
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Andrey Lebedev <kedder@users.sourceforge.net>
parents:
diff changeset
162 if __name__ == '__main__':
f19dde90e473 applied unicode patch
Andrey Lebedev <kedder@users.sourceforge.net>
parents:
diff changeset
163 test()
f19dde90e473 applied unicode patch
Andrey Lebedev <kedder@users.sourceforge.net>
parents:
diff changeset
164
f19dde90e473 applied unicode patch
Andrey Lebedev <kedder@users.sourceforge.net>
parents:
diff changeset
165 # vim: et
Roundup Issue Tracker: http://roundup-tracker.org/