Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/future/backports/email/quoprimime.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: Ben Gertzfield
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3 # Contact: email-sig@python.org
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4
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5 """Quoted-printable content transfer encoding per RFCs 2045-2047.
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6
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7 This module handles the content transfer encoding method defined in RFC 2045
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8 to encode US ASCII-like 8-bit data called `quoted-printable'. It is used to
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9 safely encode text that is in a character set similar to the 7-bit US ASCII
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10 character set, but that includes some 8-bit characters that are normally not
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11 allowed in email bodies or headers.
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12
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13 Quoted-printable is very space-inefficient for encoding binary files; use the
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14 email.base64mime module for that instead.
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15
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16 This module provides an interface to encode and decode both headers and bodies
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17 with quoted-printable encoding.
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18
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19 RFC 2045 defines a method for including character set information in an
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20 `encoded-word' in a header. This method is commonly used for 8-bit real names
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21 in To:/From:/Cc: etc. fields, as well as Subject: lines.
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22
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23 This module does not do the line wrapping or end-of-line character
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24 conversion necessary for proper internationalized headers; it only
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25 does dumb encoding and decoding. To deal with the various line
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26 wrapping issues, use the email.header module.
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27 """
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28 from __future__ import unicode_literals
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29 from __future__ import division
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30 from __future__ import absolute_import
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31 from future.builtins import bytes, chr, dict, int, range, super
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32
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33 __all__ = [
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34 'body_decode',
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35 'body_encode',
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36 'body_length',
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37 'decode',
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38 'decodestring',
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39 'header_decode',
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40 'header_encode',
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41 'header_length',
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42 'quote',
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43 'unquote',
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44 ]
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45
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46 import re
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47 import io
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48
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49 from string import ascii_letters, digits, hexdigits
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50
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51 CRLF = '\r\n'
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52 NL = '\n'
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53 EMPTYSTRING = ''
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54
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55 # Build a mapping of octets to the expansion of that octet. Since we're only
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56 # going to have 256 of these things, this isn't terribly inefficient
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57 # space-wise. Remember that headers and bodies have different sets of safe
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58 # characters. Initialize both maps with the full expansion, and then override
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59 # the safe bytes with the more compact form.
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60 _QUOPRI_HEADER_MAP = dict((c, '=%02X' % c) for c in range(256))
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61 _QUOPRI_BODY_MAP = _QUOPRI_HEADER_MAP.copy()
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62
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63 # Safe header bytes which need no encoding.
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64 for c in bytes(b'-!*+/' + ascii_letters.encode('ascii') + digits.encode('ascii')):
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65 _QUOPRI_HEADER_MAP[c] = chr(c)
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66 # Headers have one other special encoding; spaces become underscores.
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67 _QUOPRI_HEADER_MAP[ord(' ')] = '_'
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68
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69 # Safe body bytes which need no encoding.
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70 for c in bytes(b' !"#$%&\'()*+,-./0123456789:;<>'
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71 b'?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`'
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72 b'abcdefghijklmnopqrstuvwxyz{|}~\t'):
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73 _QUOPRI_BODY_MAP[c] = chr(c)
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74
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75
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76
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77 # Helpers
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78 def header_check(octet):
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79 """Return True if the octet should be escaped with header quopri."""
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80 return chr(octet) != _QUOPRI_HEADER_MAP[octet]
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81
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82
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83 def body_check(octet):
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84 """Return True if the octet should be escaped with body quopri."""
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85 return chr(octet) != _QUOPRI_BODY_MAP[octet]
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86
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87
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88 def header_length(bytearray):
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89 """Return a header quoted-printable encoding length.
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90
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91 Note that this does not include any RFC 2047 chrome added by
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92 `header_encode()`.
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93
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94 :param bytearray: An array of bytes (a.k.a. octets).
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95 :return: The length in bytes of the byte array when it is encoded with
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96 quoted-printable for headers.
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97 """
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98 return sum(len(_QUOPRI_HEADER_MAP[octet]) for octet in bytearray)
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99
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100
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101 def body_length(bytearray):
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102 """Return a body quoted-printable encoding length.
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103
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104 :param bytearray: An array of bytes (a.k.a. octets).
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105 :return: The length in bytes of the byte array when it is encoded with
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106 quoted-printable for bodies.
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107 """
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108 return sum(len(_QUOPRI_BODY_MAP[octet]) for octet in bytearray)
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109
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110
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111 def _max_append(L, s, maxlen, extra=''):
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112 if not isinstance(s, str):
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113 s = chr(s)
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114 if not L:
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115 L.append(s.lstrip())
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116 elif len(L[-1]) + len(s) <= maxlen:
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117 L[-1] += extra + s
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118 else:
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119 L.append(s.lstrip())
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120
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121
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122 def unquote(s):
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123 """Turn a string in the form =AB to the ASCII character with value 0xab"""
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124 return chr(int(s[1:3], 16))
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125
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126
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127 def quote(c):
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128 return '=%02X' % ord(c)
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129
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130
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131
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132 def header_encode(header_bytes, charset='iso-8859-1'):
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133 """Encode a single header line with quoted-printable (like) encoding.
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134
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135 Defined in RFC 2045, this `Q' encoding is similar to quoted-printable, but
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136 used specifically for email header fields to allow charsets with mostly 7
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137 bit characters (and some 8 bit) to remain more or less readable in non-RFC
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138 2045 aware mail clients.
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139
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140 charset names the character set to use in the RFC 2046 header. It
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141 defaults to iso-8859-1.
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142 """
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143 # Return empty headers as an empty string.
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144 if not header_bytes:
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145 return ''
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146 # Iterate over every byte, encoding if necessary.
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147 encoded = []
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148 for octet in header_bytes:
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149 encoded.append(_QUOPRI_HEADER_MAP[octet])
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150 # Now add the RFC chrome to each encoded chunk and glue the chunks
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151 # together.
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152 return '=?%s?q?%s?=' % (charset, EMPTYSTRING.join(encoded))
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153
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154
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155 class _body_accumulator(io.StringIO):
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156
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157 def __init__(self, maxlinelen, eol, *args, **kw):
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158 super().__init__(*args, **kw)
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159 self.eol = eol
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160 self.maxlinelen = self.room = maxlinelen
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161
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162 def write_str(self, s):
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163 """Add string s to the accumulated body."""
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164 self.write(s)
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165 self.room -= len(s)
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166
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167 def newline(self):
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168 """Write eol, then start new line."""
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169 self.write_str(self.eol)
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170 self.room = self.maxlinelen
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171
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172 def write_soft_break(self):
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173 """Write a soft break, then start a new line."""
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174 self.write_str('=')
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175 self.newline()
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176
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177 def write_wrapped(self, s, extra_room=0):
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178 """Add a soft line break if needed, then write s."""
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179 if self.room < len(s) + extra_room:
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180 self.write_soft_break()
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181 self.write_str(s)
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182
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183 def write_char(self, c, is_last_char):
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184 if not is_last_char:
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185 # Another character follows on this line, so we must leave
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186 # extra room, either for it or a soft break, and whitespace
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187 # need not be quoted.
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188 self.write_wrapped(c, extra_room=1)
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189 elif c not in ' \t':
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190 # For this and remaining cases, no more characters follow,
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191 # so there is no need to reserve extra room (since a hard
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192 # break will immediately follow).
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193 self.write_wrapped(c)
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194 elif self.room >= 3:
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195 # It's a whitespace character at end-of-line, and we have room
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196 # for the three-character quoted encoding.
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197 self.write(quote(c))
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198 elif self.room == 2:
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199 # There's room for the whitespace character and a soft break.
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200 self.write(c)
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201 self.write_soft_break()
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202 else:
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203 # There's room only for a soft break. The quoted whitespace
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204 # will be the only content on the subsequent line.
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205 self.write_soft_break()
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206 self.write(quote(c))
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207
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208
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209 def body_encode(body, maxlinelen=76, eol=NL):
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210 """Encode with quoted-printable, wrapping at maxlinelen characters.
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211
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212 Each line of encoded text will end with eol, which defaults to "\\n". Set
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213 this to "\\r\\n" if you will be using the result of this function directly
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214 in an email.
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215
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216 Each line will be wrapped at, at most, maxlinelen characters before the
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217 eol string (maxlinelen defaults to 76 characters, the maximum value
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218 permitted by RFC 2045). Long lines will have the 'soft line break'
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219 quoted-printable character "=" appended to them, so the decoded text will
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220 be identical to the original text.
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221
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222 The minimum maxlinelen is 4 to have room for a quoted character ("=XX")
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223 followed by a soft line break. Smaller values will generate a
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224 ValueError.
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225
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226 """
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227
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228 if maxlinelen < 4:
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229 raise ValueError("maxlinelen must be at least 4")
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230 if not body:
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231 return body
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232
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233 # The last line may or may not end in eol, but all other lines do.
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234 last_has_eol = (body[-1] in '\r\n')
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235
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236 # This accumulator will make it easier to build the encoded body.
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237 encoded_body = _body_accumulator(maxlinelen, eol)
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238
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239 lines = body.splitlines()
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240 last_line_no = len(lines) - 1
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241 for line_no, line in enumerate(lines):
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242 last_char_index = len(line) - 1
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243 for i, c in enumerate(line):
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244 if body_check(ord(c)):
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245 c = quote(c)
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246 encoded_body.write_char(c, i==last_char_index)
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247 # Add an eol if input line had eol. All input lines have eol except
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248 # possibly the last one.
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249 if line_no < last_line_no or last_has_eol:
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250 encoded_body.newline()
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251
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252 return encoded_body.getvalue()
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253
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254
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255
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256 # BAW: I'm not sure if the intent was for the signature of this function to be
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257 # the same as base64MIME.decode() or not...
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258 def decode(encoded, eol=NL):
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259 """Decode a quoted-printable string.
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260
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261 Lines are separated with eol, which defaults to \\n.
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262 """
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263 if not encoded:
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264 return encoded
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265 # BAW: see comment in encode() above. Again, we're building up the
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266 # decoded string with string concatenation, which could be done much more
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267 # efficiently.
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268 decoded = ''
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269
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270 for line in encoded.splitlines():
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271 line = line.rstrip()
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272 if not line:
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273 decoded += eol
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274 continue
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275
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276 i = 0
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277 n = len(line)
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278 while i < n:
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279 c = line[i]
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280 if c != '=':
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281 decoded += c
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282 i += 1
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283 # Otherwise, c == "=". Are we at the end of the line? If so, add
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284 # a soft line break.
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285 elif i+1 == n:
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286 i += 1
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287 continue
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288 # Decode if in form =AB
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289 elif i+2 < n and line[i+1] in hexdigits and line[i+2] in hexdigits:
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290 decoded += unquote(line[i:i+3])
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291 i += 3
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292 # Otherwise, not in form =AB, pass literally
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293 else:
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294 decoded += c
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295 i += 1
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296
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297 if i == n:
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298 decoded += eol
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299 # Special case if original string did not end with eol
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300 if encoded[-1] not in '\r\n' and decoded.endswith(eol):
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301 decoded = decoded[:-1]
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302 return decoded
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303
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304
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305 # For convenience and backwards compatibility w/ standard base64 module
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306 body_decode = decode
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307 decodestring = decode
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308
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309
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310
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311 def _unquote_match(match):
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312 """Turn a match in the form =AB to the ASCII character with value 0xab"""
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313 s = match.group(0)
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314 return unquote(s)
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315
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316
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317 # Header decoding is done a bit differently
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318 def header_decode(s):
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319 """Decode a string encoded with RFC 2045 MIME header `Q' encoding.
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320
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321 This function does not parse a full MIME header value encoded with
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322 quoted-printable (like =?iso-8895-1?q?Hello_World?=) -- please use
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323 the high level email.header class for that functionality.
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324 """
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325 s = s.replace('_', ' ')
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326 return re.sub(r'=[a-fA-F0-9]{2}', _unquote_match, s, re.ASCII)