Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/future/backports/email/header.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) 2002-2007 Python Software Foundation
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2 # Author: Ben Gertzfield, Barry Warsaw
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3 # Contact: email-sig@python.org
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4
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5 """Header encoding and decoding functionality."""
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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 bytes, range, str, super, zip
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10
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11 __all__ = [
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12 'Header',
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13 'decode_header',
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14 'make_header',
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15 ]
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16
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17 import re
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18 import binascii
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19
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20 from future.backports import email
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21 from future.backports.email import base64mime
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22 from future.backports.email.errors import HeaderParseError
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23 import future.backports.email.charset as _charset
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24
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25 # Helpers
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26 from future.backports.email.quoprimime import _max_append, header_decode
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27
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28 Charset = _charset.Charset
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29
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30 NL = '\n'
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31 SPACE = ' '
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32 BSPACE = b' '
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33 SPACE8 = ' ' * 8
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34 EMPTYSTRING = ''
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35 MAXLINELEN = 78
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36 FWS = ' \t'
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37
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38 USASCII = Charset('us-ascii')
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39 UTF8 = Charset('utf-8')
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40
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41 # Match encoded-word strings in the form =?charset?q?Hello_World?=
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42 ecre = re.compile(r'''
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43 =\? # literal =?
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44 (?P<charset>[^?]*?) # non-greedy up to the next ? is the charset
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45 \? # literal ?
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46 (?P<encoding>[qb]) # either a "q" or a "b", case insensitive
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47 \? # literal ?
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48 (?P<encoded>.*?) # non-greedy up to the next ?= is the encoded string
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49 \?= # literal ?=
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50 ''', re.VERBOSE | re.IGNORECASE | re.MULTILINE)
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51
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52 # Field name regexp, including trailing colon, but not separating whitespace,
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53 # according to RFC 2822. Character range is from tilde to exclamation mark.
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54 # For use with .match()
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55 fcre = re.compile(r'[\041-\176]+:$')
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56
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57 # Find a header embedded in a putative header value. Used to check for
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58 # header injection attack.
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59 _embeded_header = re.compile(r'\n[^ \t]+:')
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60
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61
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62 def decode_header(header):
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63 """Decode a message header value without converting charset.
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64
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65 Returns a list of (string, charset) pairs containing each of the decoded
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66 parts of the header. Charset is None for non-encoded parts of the header,
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67 otherwise a lower-case string containing the name of the character set
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68 specified in the encoded string.
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69
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70 header may be a string that may or may not contain RFC2047 encoded words,
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71 or it may be a Header object.
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72
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73 An email.errors.HeaderParseError may be raised when certain decoding error
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74 occurs (e.g. a base64 decoding exception).
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75 """
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76 # If it is a Header object, we can just return the encoded chunks.
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77 if hasattr(header, '_chunks'):
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78 return [(_charset._encode(string, str(charset)), str(charset))
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79 for string, charset in header._chunks]
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80 # If no encoding, just return the header with no charset.
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81 if not ecre.search(header):
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82 return [(header, None)]
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83 # First step is to parse all the encoded parts into triplets of the form
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84 # (encoded_string, encoding, charset). For unencoded strings, the last
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85 # two parts will be None.
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86 words = []
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87 for line in header.splitlines():
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88 parts = ecre.split(line)
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89 first = True
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90 while parts:
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91 unencoded = parts.pop(0)
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92 if first:
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93 unencoded = unencoded.lstrip()
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94 first = False
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95 if unencoded:
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96 words.append((unencoded, None, None))
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97 if parts:
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98 charset = parts.pop(0).lower()
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99 encoding = parts.pop(0).lower()
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100 encoded = parts.pop(0)
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101 words.append((encoded, encoding, charset))
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102 # Now loop over words and remove words that consist of whitespace
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103 # between two encoded strings.
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104 import sys
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105 droplist = []
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106 for n, w in enumerate(words):
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107 if n>1 and w[1] and words[n-2][1] and words[n-1][0].isspace():
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108 droplist.append(n-1)
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109 for d in reversed(droplist):
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110 del words[d]
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111
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112 # The next step is to decode each encoded word by applying the reverse
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113 # base64 or quopri transformation. decoded_words is now a list of the
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114 # form (decoded_word, charset).
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115 decoded_words = []
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116 for encoded_string, encoding, charset in words:
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117 if encoding is None:
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118 # This is an unencoded word.
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119 decoded_words.append((encoded_string, charset))
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120 elif encoding == 'q':
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121 word = header_decode(encoded_string)
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122 decoded_words.append((word, charset))
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123 elif encoding == 'b':
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124 paderr = len(encoded_string) % 4 # Postel's law: add missing padding
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125 if paderr:
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126 encoded_string += '==='[:4 - paderr]
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127 try:
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128 word = base64mime.decode(encoded_string)
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129 except binascii.Error:
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130 raise HeaderParseError('Base64 decoding error')
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131 else:
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132 decoded_words.append((word, charset))
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133 else:
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134 raise AssertionError('Unexpected encoding: ' + encoding)
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135 # Now convert all words to bytes and collapse consecutive runs of
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136 # similarly encoded words.
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137 collapsed = []
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138 last_word = last_charset = None
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139 for word, charset in decoded_words:
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140 if isinstance(word, str):
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141 word = bytes(word, 'raw-unicode-escape')
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142 if last_word is None:
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143 last_word = word
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144 last_charset = charset
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145 elif charset != last_charset:
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146 collapsed.append((last_word, last_charset))
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147 last_word = word
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148 last_charset = charset
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149 elif last_charset is None:
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150 last_word += BSPACE + word
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151 else:
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152 last_word += word
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153 collapsed.append((last_word, last_charset))
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154 return collapsed
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155
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156
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157 def make_header(decoded_seq, maxlinelen=None, header_name=None,
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158 continuation_ws=' '):
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159 """Create a Header from a sequence of pairs as returned by decode_header()
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160
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161 decode_header() takes a header value string and returns a sequence of
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162 pairs of the format (decoded_string, charset) where charset is the string
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163 name of the character set.
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164
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165 This function takes one of those sequence of pairs and returns a Header
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166 instance. Optional maxlinelen, header_name, and continuation_ws are as in
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167 the Header constructor.
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168 """
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169 h = Header(maxlinelen=maxlinelen, header_name=header_name,
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170 continuation_ws=continuation_ws)
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171 for s, charset in decoded_seq:
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172 # None means us-ascii but we can simply pass it on to h.append()
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173 if charset is not None and not isinstance(charset, Charset):
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174 charset = Charset(charset)
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175 h.append(s, charset)
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176 return h
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177
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178
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179 class Header(object):
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180 def __init__(self, s=None, charset=None,
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181 maxlinelen=None, header_name=None,
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182 continuation_ws=' ', errors='strict'):
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183 """Create a MIME-compliant header that can contain many character sets.
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184
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185 Optional s is the initial header value. If None, the initial header
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186 value is not set. You can later append to the header with .append()
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187 method calls. s may be a byte string or a Unicode string, but see the
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188 .append() documentation for semantics.
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189
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190 Optional charset serves two purposes: it has the same meaning as the
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191 charset argument to the .append() method. It also sets the default
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192 character set for all subsequent .append() calls that omit the charset
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193 argument. If charset is not provided in the constructor, the us-ascii
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194 charset is used both as s's initial charset and as the default for
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195 subsequent .append() calls.
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196
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197 The maximum line length can be specified explicitly via maxlinelen. For
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198 splitting the first line to a shorter value (to account for the field
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199 header which isn't included in s, e.g. `Subject') pass in the name of
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200 the field in header_name. The default maxlinelen is 78 as recommended
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201 by RFC 2822.
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202
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203 continuation_ws must be RFC 2822 compliant folding whitespace (usually
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204 either a space or a hard tab) which will be prepended to continuation
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205 lines.
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206
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207 errors is passed through to the .append() call.
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208 """
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209 if charset is None:
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210 charset = USASCII
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211 elif not isinstance(charset, Charset):
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212 charset = Charset(charset)
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213 self._charset = charset
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214 self._continuation_ws = continuation_ws
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215 self._chunks = []
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216 if s is not None:
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217 self.append(s, charset, errors)
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218 if maxlinelen is None:
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219 maxlinelen = MAXLINELEN
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220 self._maxlinelen = maxlinelen
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221 if header_name is None:
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222 self._headerlen = 0
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223 else:
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224 # Take the separating colon and space into account.
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225 self._headerlen = len(header_name) + 2
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226
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227 def __str__(self):
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228 """Return the string value of the header."""
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229 self._normalize()
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230 uchunks = []
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231 lastcs = None
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232 lastspace = None
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233 for string, charset in self._chunks:
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234 # We must preserve spaces between encoded and non-encoded word
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235 # boundaries, which means for us we need to add a space when we go
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236 # from a charset to None/us-ascii, or from None/us-ascii to a
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237 # charset. Only do this for the second and subsequent chunks.
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238 # Don't add a space if the None/us-ascii string already has
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239 # a space (trailing or leading depending on transition)
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240 nextcs = charset
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241 if nextcs == _charset.UNKNOWN8BIT:
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242 original_bytes = string.encode('ascii', 'surrogateescape')
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243 string = original_bytes.decode('ascii', 'replace')
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244 if uchunks:
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245 hasspace = string and self._nonctext(string[0])
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246 if lastcs not in (None, 'us-ascii'):
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247 if nextcs in (None, 'us-ascii') and not hasspace:
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248 uchunks.append(SPACE)
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249 nextcs = None
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250 elif nextcs not in (None, 'us-ascii') and not lastspace:
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251 uchunks.append(SPACE)
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252 lastspace = string and self._nonctext(string[-1])
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253 lastcs = nextcs
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254 uchunks.append(string)
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255 return EMPTYSTRING.join(uchunks)
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256
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257 # Rich comparison operators for equality only. BAW: does it make sense to
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258 # have or explicitly disable <, <=, >, >= operators?
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259 def __eq__(self, other):
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260 # other may be a Header or a string. Both are fine so coerce
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261 # ourselves to a unicode (of the unencoded header value), swap the
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262 # args and do another comparison.
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263 return other == str(self)
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264
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265 def __ne__(self, other):
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266 return not self == other
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267
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268 def append(self, s, charset=None, errors='strict'):
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269 """Append a string to the MIME header.
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270
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271 Optional charset, if given, should be a Charset instance or the name
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272 of a character set (which will be converted to a Charset instance). A
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273 value of None (the default) means that the charset given in the
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274 constructor is used.
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275
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276 s may be a byte string or a Unicode string. If it is a byte string
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277 (i.e. isinstance(s, str) is false), then charset is the encoding of
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278 that byte string, and a UnicodeError will be raised if the string
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279 cannot be decoded with that charset. If s is a Unicode string, then
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280 charset is a hint specifying the character set of the characters in
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281 the string. In either case, when producing an RFC 2822 compliant
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282 header using RFC 2047 rules, the string will be encoded using the
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283 output codec of the charset. If the string cannot be encoded to the
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284 output codec, a UnicodeError will be raised.
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285
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286 Optional `errors' is passed as the errors argument to the decode
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287 call if s is a byte string.
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288 """
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289 if charset is None:
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290 charset = self._charset
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291 elif not isinstance(charset, Charset):
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292 charset = Charset(charset)
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293 if not isinstance(s, str):
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294 input_charset = charset.input_codec or 'us-ascii'
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295 if input_charset == _charset.UNKNOWN8BIT:
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296 s = s.decode('us-ascii', 'surrogateescape')
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297 else:
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298 s = s.decode(input_charset, errors)
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299 # Ensure that the bytes we're storing can be decoded to the output
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300 # character set, otherwise an early error is raised.
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301 output_charset = charset.output_codec or 'us-ascii'
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302 if output_charset != _charset.UNKNOWN8BIT:
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303 try:
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304 s.encode(output_charset, errors)
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305 except UnicodeEncodeError:
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306 if output_charset!='us-ascii':
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307 raise
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308 charset = UTF8
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309 self._chunks.append((s, charset))
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310
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311 def _nonctext(self, s):
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312 """True if string s is not a ctext character of RFC822.
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313 """
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314 return s.isspace() or s in ('(', ')', '\\')
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315
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316 def encode(self, splitchars=';, \t', maxlinelen=None, linesep='\n'):
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317 r"""Encode a message header into an RFC-compliant format.
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318
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319 There are many issues involved in converting a given string for use in
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320 an email header. Only certain character sets are readable in most
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321 email clients, and as header strings can only contain a subset of
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322 7-bit ASCII, care must be taken to properly convert and encode (with
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323 Base64 or quoted-printable) header strings. In addition, there is a
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324 75-character length limit on any given encoded header field, so
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325 line-wrapping must be performed, even with double-byte character sets.
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326
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327 Optional maxlinelen specifies the maximum length of each generated
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328 line, exclusive of the linesep string. Individual lines may be longer
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329 than maxlinelen if a folding point cannot be found. The first line
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330 will be shorter by the length of the header name plus ": " if a header
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331 name was specified at Header construction time. The default value for
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332 maxlinelen is determined at header construction time.
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333
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334 Optional splitchars is a string containing characters which should be
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335 given extra weight by the splitting algorithm during normal header
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336 wrapping. This is in very rough support of RFC 2822's `higher level
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337 syntactic breaks': split points preceded by a splitchar are preferred
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338 during line splitting, with the characters preferred in the order in
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339 which they appear in the string. Space and tab may be included in the
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340 string to indicate whether preference should be given to one over the
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341 other as a split point when other split chars do not appear in the line
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342 being split. Splitchars does not affect RFC 2047 encoded lines.
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343
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344 Optional linesep is a string to be used to separate the lines of
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345 the value. The default value is the most useful for typical
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346 Python applications, but it can be set to \r\n to produce RFC-compliant
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347 line separators when needed.
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348 """
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349 self._normalize()
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350 if maxlinelen is None:
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351 maxlinelen = self._maxlinelen
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352 # A maxlinelen of 0 means don't wrap. For all practical purposes,
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353 # choosing a huge number here accomplishes that and makes the
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354 # _ValueFormatter algorithm much simpler.
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355 if maxlinelen == 0:
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356 maxlinelen = 1000000
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357 formatter = _ValueFormatter(self._headerlen, maxlinelen,
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358 self._continuation_ws, splitchars)
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359 lastcs = None
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360 hasspace = lastspace = None
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361 for string, charset in self._chunks:
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362 if hasspace is not None:
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363 hasspace = string and self._nonctext(string[0])
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364 import sys
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365 if lastcs not in (None, 'us-ascii'):
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366 if not hasspace or charset not in (None, 'us-ascii'):
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367 formatter.add_transition()
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368 elif charset not in (None, 'us-ascii') and not lastspace:
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369 formatter.add_transition()
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370 lastspace = string and self._nonctext(string[-1])
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371 lastcs = charset
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372 hasspace = False
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373 lines = string.splitlines()
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374 if lines:
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375 formatter.feed('', lines[0], charset)
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376 else:
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377 formatter.feed('', '', charset)
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378 for line in lines[1:]:
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379 formatter.newline()
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380 if charset.header_encoding is not None:
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381 formatter.feed(self._continuation_ws, ' ' + line.lstrip(),
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382 charset)
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383 else:
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384 sline = line.lstrip()
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385 fws = line[:len(line)-len(sline)]
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386 formatter.feed(fws, sline, charset)
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387 if len(lines) > 1:
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388 formatter.newline()
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diff changeset
389 if self._chunks:
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diff changeset
390 formatter.add_transition()
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391 value = formatter._str(linesep)
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392 if _embeded_header.search(value):
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393 raise HeaderParseError("header value appears to contain "
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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394 "an embedded header: {!r}".format(value))
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395 return value
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396
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397 def _normalize(self):
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diff changeset
398 # Step 1: Normalize the chunks so that all runs of identical charsets
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399 # get collapsed into a single unicode string.
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400 chunks = []
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401 last_charset = None
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402 last_chunk = []
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403 for string, charset in self._chunks:
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diff changeset
404 if charset == last_charset:
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405 last_chunk.append(string)
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406 else:
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407 if last_charset is not None:
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408 chunks.append((SPACE.join(last_chunk), last_charset))
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409 last_chunk = [string]
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410 last_charset = charset
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411 if last_chunk:
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412 chunks.append((SPACE.join(last_chunk), last_charset))
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413 self._chunks = chunks
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414
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415
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416 class _ValueFormatter(object):
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417 def __init__(self, headerlen, maxlen, continuation_ws, splitchars):
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418 self._maxlen = maxlen
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419 self._continuation_ws = continuation_ws
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420 self._continuation_ws_len = len(continuation_ws)
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421 self._splitchars = splitchars
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422 self._lines = []
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423 self._current_line = _Accumulator(headerlen)
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424
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425 def _str(self, linesep):
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426 self.newline()
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427 return linesep.join(self._lines)
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428
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429 def __str__(self):
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430 return self._str(NL)
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431
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432 def newline(self):
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433 end_of_line = self._current_line.pop()
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434 if end_of_line != (' ', ''):
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435 self._current_line.push(*end_of_line)
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436 if len(self._current_line) > 0:
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437 if self._current_line.is_onlyws():
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438 self._lines[-1] += str(self._current_line)
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439 else:
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440 self._lines.append(str(self._current_line))
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441 self._current_line.reset()
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442
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443 def add_transition(self):
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444 self._current_line.push(' ', '')
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445
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446 def feed(self, fws, string, charset):
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447 # If the charset has no header encoding (i.e. it is an ASCII encoding)
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448 # then we must split the header at the "highest level syntactic break"
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449 # possible. Note that we don't have a lot of smarts about field
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450 # syntax; we just try to break on semi-colons, then commas, then
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451 # whitespace. Eventually, this should be pluggable.
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452 if charset.header_encoding is None:
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453 self._ascii_split(fws, string, self._splitchars)
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454 return
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455 # Otherwise, we're doing either a Base64 or a quoted-printable
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456 # encoding which means we don't need to split the line on syntactic
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457 # breaks. We can basically just find enough characters to fit on the
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458 # current line, minus the RFC 2047 chrome. What makes this trickier
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459 # though is that we have to split at octet boundaries, not character
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460 # boundaries but it's only safe to split at character boundaries so at
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461 # best we can only get close.
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462 encoded_lines = charset.header_encode_lines(string, self._maxlengths())
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463 # The first element extends the current line, but if it's None then
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464 # nothing more fit on the current line so start a new line.
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465 try:
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466 first_line = encoded_lines.pop(0)
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467 except IndexError:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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468 # There are no encoded lines, so we're done.
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469 return
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470 if first_line is not None:
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471 self._append_chunk(fws, first_line)
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diff changeset
472 try:
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473 last_line = encoded_lines.pop()
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474 except IndexError:
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475 # There was only one line.
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476 return
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477 self.newline()
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478 self._current_line.push(self._continuation_ws, last_line)
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479 # Everything else are full lines in themselves.
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480 for line in encoded_lines:
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481 self._lines.append(self._continuation_ws + line)
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482
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483 def _maxlengths(self):
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484 # The first line's length.
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485 yield self._maxlen - len(self._current_line)
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486 while True:
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487 yield self._maxlen - self._continuation_ws_len
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488
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489 def _ascii_split(self, fws, string, splitchars):
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490 # The RFC 2822 header folding algorithm is simple in principle but
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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491 # complex in practice. Lines may be folded any place where "folding
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492 # white space" appears by inserting a linesep character in front of the
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493 # FWS. The complication is that not all spaces or tabs qualify as FWS,
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diff changeset
494 # and we are also supposed to prefer to break at "higher level
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diff changeset
495 # syntactic breaks". We can't do either of these without intimate
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diff changeset
496 # knowledge of the structure of structured headers, which we don't have
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diff changeset
497 # here. So the best we can do here is prefer to break at the specified
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498 # splitchars, and hope that we don't choose any spaces or tabs that
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diff changeset
499 # aren't legal FWS. (This is at least better than the old algorithm,
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500 # where we would sometimes *introduce* FWS after a splitchar, or the
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diff changeset
501 # algorithm before that, where we would turn all white space runs into
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
502 # single spaces or tabs.)
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503 parts = re.split("(["+FWS+"]+)", fws+string)
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504 if parts[0]:
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505 parts[:0] = ['']
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506 else:
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507 parts.pop(0)
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508 for fws, part in zip(*[iter(parts)]*2):
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509 self._append_chunk(fws, part)
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510
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511 def _append_chunk(self, fws, string):
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512 self._current_line.push(fws, string)
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513 if len(self._current_line) > self._maxlen:
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514 # Find the best split point, working backward from the end.
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515 # There might be none, on a long first line.
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516 for ch in self._splitchars:
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517 for i in range(self._current_line.part_count()-1, 0, -1):
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518 if ch.isspace():
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519 fws = self._current_line[i][0]
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520 if fws and fws[0]==ch:
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521 break
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522 prevpart = self._current_line[i-1][1]
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523 if prevpart and prevpart[-1]==ch:
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524 break
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525 else:
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526 continue
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527 break
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528 else:
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529 fws, part = self._current_line.pop()
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530 if self._current_line._initial_size > 0:
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531 # There will be a header, so leave it on a line by itself.
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532 self.newline()
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533 if not fws:
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534 # We don't use continuation_ws here because the whitespace
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535 # after a header should always be a space.
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536 fws = ' '
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537 self._current_line.push(fws, part)
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538 return
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539 remainder = self._current_line.pop_from(i)
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540 self._lines.append(str(self._current_line))
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541 self._current_line.reset(remainder)
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542
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543
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544 class _Accumulator(list):
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545
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546 def __init__(self, initial_size=0):
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547 self._initial_size = initial_size
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548 super().__init__()
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549
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550 def push(self, fws, string):
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551 self.append((fws, string))
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552
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553 def pop_from(self, i=0):
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554 popped = self[i:]
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555 self[i:] = []
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556 return popped
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557
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558 def pop(self):
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559 if self.part_count()==0:
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560 return ('', '')
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561 return super().pop()
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562
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563 def __len__(self):
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564 return sum((len(fws)+len(part) for fws, part in self),
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565 self._initial_size)
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566
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567 def __str__(self):
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568 return EMPTYSTRING.join((EMPTYSTRING.join((fws, part))
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569 for fws, part in self))
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570
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571 def reset(self, startval=None):
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572 if startval is None:
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573 startval = []
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574 self[:] = startval
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575 self._initial_size = 0
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576
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577 def is_onlyws(self):
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578 return self._initial_size==0 and (not self or str(self).isspace())
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579
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580 def part_count(self):
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581 return super().__len__()