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annotate planemo/lib/python3.7/site-packages/future/backports/email/policy.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 """This will be the home for the policy that hooks in the new
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2 code that adds all the email6 features.
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3 """
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4 from __future__ import unicode_literals
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5 from __future__ import division
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6 from __future__ import absolute_import
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7 from future.builtins import super
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8
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9 from future.standard_library.email._policybase import (Policy, Compat32,
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10 compat32, _extend_docstrings)
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11 from future.standard_library.email.utils import _has_surrogates
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12 from future.standard_library.email.headerregistry import HeaderRegistry as HeaderRegistry
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13
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14 __all__ = [
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15 'Compat32',
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16 'compat32',
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17 'Policy',
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18 'EmailPolicy',
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19 'default',
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20 'strict',
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21 'SMTP',
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22 'HTTP',
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23 ]
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24
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25 @_extend_docstrings
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26 class EmailPolicy(Policy):
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27
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28 """+
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29 PROVISIONAL
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30
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31 The API extensions enabled by this policy are currently provisional.
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32 Refer to the documentation for details.
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33
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34 This policy adds new header parsing and folding algorithms. Instead of
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35 simple strings, headers are custom objects with custom attributes
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36 depending on the type of the field. The folding algorithm fully
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37 implements RFCs 2047 and 5322.
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38
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39 In addition to the settable attributes listed above that apply to
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40 all Policies, this policy adds the following additional attributes:
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41
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42 refold_source -- if the value for a header in the Message object
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43 came from the parsing of some source, this attribute
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44 indicates whether or not a generator should refold
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45 that value when transforming the message back into
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46 stream form. The possible values are:
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47
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48 none -- all source values use original folding
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49 long -- source values that have any line that is
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50 longer than max_line_length will be
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51 refolded
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52 all -- all values are refolded.
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53
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54 The default is 'long'.
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55
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56 header_factory -- a callable that takes two arguments, 'name' and
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57 'value', where 'name' is a header field name and
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58 'value' is an unfolded header field value, and
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59 returns a string-like object that represents that
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60 header. A default header_factory is provided that
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61 understands some of the RFC5322 header field types.
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62 (Currently address fields and date fields have
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63 special treatment, while all other fields are
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64 treated as unstructured. This list will be
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65 completed before the extension is marked stable.)
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66 """
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67
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68 refold_source = 'long'
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69 header_factory = HeaderRegistry()
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70
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71 def __init__(self, **kw):
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72 # Ensure that each new instance gets a unique header factory
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73 # (as opposed to clones, which share the factory).
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74 if 'header_factory' not in kw:
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75 object.__setattr__(self, 'header_factory', HeaderRegistry())
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76 super().__init__(**kw)
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77
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78 def header_max_count(self, name):
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79 """+
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80 The implementation for this class returns the max_count attribute from
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81 the specialized header class that would be used to construct a header
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82 of type 'name'.
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83 """
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84 return self.header_factory[name].max_count
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85
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86 # The logic of the next three methods is chosen such that it is possible to
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87 # switch a Message object between a Compat32 policy and a policy derived
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88 # from this class and have the results stay consistent. This allows a
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89 # Message object constructed with this policy to be passed to a library
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90 # that only handles Compat32 objects, or to receive such an object and
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91 # convert it to use the newer style by just changing its policy. It is
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92 # also chosen because it postpones the relatively expensive full rfc5322
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93 # parse until as late as possible when parsing from source, since in many
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94 # applications only a few headers will actually be inspected.
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95
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96 def header_source_parse(self, sourcelines):
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97 """+
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98 The name is parsed as everything up to the ':' and returned unmodified.
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99 The value is determined by stripping leading whitespace off the
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100 remainder of the first line, joining all subsequent lines together, and
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101 stripping any trailing carriage return or linefeed characters. (This
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102 is the same as Compat32).
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103
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104 """
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105 name, value = sourcelines[0].split(':', 1)
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106 value = value.lstrip(' \t') + ''.join(sourcelines[1:])
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107 return (name, value.rstrip('\r\n'))
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108
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109 def header_store_parse(self, name, value):
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110 """+
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111 The name is returned unchanged. If the input value has a 'name'
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112 attribute and it matches the name ignoring case, the value is returned
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113 unchanged. Otherwise the name and value are passed to header_factory
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114 method, and the resulting custom header object is returned as the
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115 value. In this case a ValueError is raised if the input value contains
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116 CR or LF characters.
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117
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118 """
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119 if hasattr(value, 'name') and value.name.lower() == name.lower():
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120 return (name, value)
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121 if isinstance(value, str) and len(value.splitlines())>1:
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122 raise ValueError("Header values may not contain linefeed "
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123 "or carriage return characters")
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124 return (name, self.header_factory(name, value))
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125
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126 def header_fetch_parse(self, name, value):
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127 """+
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128 If the value has a 'name' attribute, it is returned to unmodified.
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129 Otherwise the name and the value with any linesep characters removed
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130 are passed to the header_factory method, and the resulting custom
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131 header object is returned. Any surrogateescaped bytes get turned
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132 into the unicode unknown-character glyph.
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133
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134 """
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135 if hasattr(value, 'name'):
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136 return value
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137 return self.header_factory(name, ''.join(value.splitlines()))
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138
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139 def fold(self, name, value):
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140 """+
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141 Header folding is controlled by the refold_source policy setting. A
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142 value is considered to be a 'source value' if and only if it does not
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143 have a 'name' attribute (having a 'name' attribute means it is a header
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144 object of some sort). If a source value needs to be refolded according
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145 to the policy, it is converted into a custom header object by passing
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146 the name and the value with any linesep characters removed to the
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147 header_factory method. Folding of a custom header object is done by
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148 calling its fold method with the current policy.
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149
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150 Source values are split into lines using splitlines. If the value is
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151 not to be refolded, the lines are rejoined using the linesep from the
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152 policy and returned. The exception is lines containing non-ascii
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153 binary data. In that case the value is refolded regardless of the
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154 refold_source setting, which causes the binary data to be CTE encoded
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155 using the unknown-8bit charset.
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156
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157 """
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158 return self._fold(name, value, refold_binary=True)
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159
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160 def fold_binary(self, name, value):
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161 """+
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162 The same as fold if cte_type is 7bit, except that the returned value is
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163 bytes.
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164
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165 If cte_type is 8bit, non-ASCII binary data is converted back into
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166 bytes. Headers with binary data are not refolded, regardless of the
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167 refold_header setting, since there is no way to know whether the binary
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168 data consists of single byte characters or multibyte characters.
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169
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170 """
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171 folded = self._fold(name, value, refold_binary=self.cte_type=='7bit')
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172 return folded.encode('ascii', 'surrogateescape')
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173
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174 def _fold(self, name, value, refold_binary=False):
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175 if hasattr(value, 'name'):
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176 return value.fold(policy=self)
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177 maxlen = self.max_line_length if self.max_line_length else float('inf')
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178 lines = value.splitlines()
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179 refold = (self.refold_source == 'all' or
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180 self.refold_source == 'long' and
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181 (lines and len(lines[0])+len(name)+2 > maxlen or
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182 any(len(x) > maxlen for x in lines[1:])))
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183 if refold or refold_binary and _has_surrogates(value):
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184 return self.header_factory(name, ''.join(lines)).fold(policy=self)
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185 return name + ': ' + self.linesep.join(lines) + self.linesep
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186
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187
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188 default = EmailPolicy()
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189 # Make the default policy use the class default header_factory
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190 del default.header_factory
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191 strict = default.clone(raise_on_defect=True)
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192 SMTP = default.clone(linesep='\r\n')
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193 HTTP = default.clone(linesep='\r\n', max_line_length=None)