Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/future/backports/email/headerregistry.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 """Representing and manipulating email headers via custom objects.
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2
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3 This module provides an implementation of the HeaderRegistry API.
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4 The implementation is designed to flexibly follow RFC5322 rules.
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5
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6 Eventually HeaderRegistry will be a public API, but it isn't yet,
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7 and will probably change some before that happens.
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8
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9 """
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10 from __future__ import unicode_literals
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11 from __future__ import division
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12 from __future__ import absolute_import
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13
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14 from future.builtins import super
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15 from future.builtins import str
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16 from future.utils import text_to_native_str
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17 from future.backports.email import utils
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18 from future.backports.email import errors
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19 from future.backports.email import _header_value_parser as parser
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20
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21 class Address(object):
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22
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23 def __init__(self, display_name='', username='', domain='', addr_spec=None):
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24 """Create an object represeting a full email address.
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25
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26 An address can have a 'display_name', a 'username', and a 'domain'. In
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27 addition to specifying the username and domain separately, they may be
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28 specified together by using the addr_spec keyword *instead of* the
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29 username and domain keywords. If an addr_spec string is specified it
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30 must be properly quoted according to RFC 5322 rules; an error will be
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31 raised if it is not.
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32
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33 An Address object has display_name, username, domain, and addr_spec
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34 attributes, all of which are read-only. The addr_spec and the string
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35 value of the object are both quoted according to RFC5322 rules, but
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36 without any Content Transfer Encoding.
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37
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38 """
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39 # This clause with its potential 'raise' may only happen when an
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40 # application program creates an Address object using an addr_spec
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41 # keyword. The email library code itself must always supply username
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42 # and domain.
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43 if addr_spec is not None:
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44 if username or domain:
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45 raise TypeError("addrspec specified when username and/or "
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46 "domain also specified")
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47 a_s, rest = parser.get_addr_spec(addr_spec)
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48 if rest:
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49 raise ValueError("Invalid addr_spec; only '{}' "
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50 "could be parsed from '{}'".format(
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51 a_s, addr_spec))
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52 if a_s.all_defects:
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53 raise a_s.all_defects[0]
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54 username = a_s.local_part
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55 domain = a_s.domain
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56 self._display_name = display_name
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57 self._username = username
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58 self._domain = domain
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59
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60 @property
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61 def display_name(self):
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62 return self._display_name
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63
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64 @property
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65 def username(self):
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66 return self._username
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67
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68 @property
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69 def domain(self):
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70 return self._domain
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71
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72 @property
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73 def addr_spec(self):
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74 """The addr_spec (username@domain) portion of the address, quoted
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75 according to RFC 5322 rules, but with no Content Transfer Encoding.
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76 """
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77 nameset = set(self.username)
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78 if len(nameset) > len(nameset-parser.DOT_ATOM_ENDS):
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79 lp = parser.quote_string(self.username)
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80 else:
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81 lp = self.username
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82 if self.domain:
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83 return lp + '@' + self.domain
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84 if not lp:
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85 return '<>'
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86 return lp
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87
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88 def __repr__(self):
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89 return "Address(display_name={!r}, username={!r}, domain={!r})".format(
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90 self.display_name, self.username, self.domain)
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91
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92 def __str__(self):
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93 nameset = set(self.display_name)
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94 if len(nameset) > len(nameset-parser.SPECIALS):
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95 disp = parser.quote_string(self.display_name)
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96 else:
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97 disp = self.display_name
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98 if disp:
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99 addr_spec = '' if self.addr_spec=='<>' else self.addr_spec
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100 return "{} <{}>".format(disp, addr_spec)
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101 return self.addr_spec
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102
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103 def __eq__(self, other):
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104 if type(other) != type(self):
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105 return False
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106 return (self.display_name == other.display_name and
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107 self.username == other.username and
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108 self.domain == other.domain)
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109
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110
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111 class Group(object):
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112
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113 def __init__(self, display_name=None, addresses=None):
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114 """Create an object representing an address group.
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115
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116 An address group consists of a display_name followed by colon and an
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117 list of addresses (see Address) terminated by a semi-colon. The Group
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118 is created by specifying a display_name and a possibly empty list of
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119 Address objects. A Group can also be used to represent a single
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120 address that is not in a group, which is convenient when manipulating
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121 lists that are a combination of Groups and individual Addresses. In
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122 this case the display_name should be set to None. In particular, the
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123 string representation of a Group whose display_name is None is the same
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124 as the Address object, if there is one and only one Address object in
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125 the addresses list.
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126
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127 """
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128 self._display_name = display_name
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129 self._addresses = tuple(addresses) if addresses else tuple()
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130
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131 @property
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132 def display_name(self):
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133 return self._display_name
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134
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135 @property
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136 def addresses(self):
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137 return self._addresses
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138
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139 def __repr__(self):
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140 return "Group(display_name={!r}, addresses={!r}".format(
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141 self.display_name, self.addresses)
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142
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143 def __str__(self):
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144 if self.display_name is None and len(self.addresses)==1:
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145 return str(self.addresses[0])
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146 disp = self.display_name
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147 if disp is not None:
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148 nameset = set(disp)
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149 if len(nameset) > len(nameset-parser.SPECIALS):
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150 disp = parser.quote_string(disp)
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151 adrstr = ", ".join(str(x) for x in self.addresses)
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152 adrstr = ' ' + adrstr if adrstr else adrstr
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153 return "{}:{};".format(disp, adrstr)
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154
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155 def __eq__(self, other):
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156 if type(other) != type(self):
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157 return False
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158 return (self.display_name == other.display_name and
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159 self.addresses == other.addresses)
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160
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161
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162 # Header Classes #
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163
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164 class BaseHeader(str):
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165
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166 """Base class for message headers.
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167
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168 Implements generic behavior and provides tools for subclasses.
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169
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170 A subclass must define a classmethod named 'parse' that takes an unfolded
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171 value string and a dictionary as its arguments. The dictionary will
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172 contain one key, 'defects', initialized to an empty list. After the call
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173 the dictionary must contain two additional keys: parse_tree, set to the
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174 parse tree obtained from parsing the header, and 'decoded', set to the
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175 string value of the idealized representation of the data from the value.
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176 (That is, encoded words are decoded, and values that have canonical
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177 representations are so represented.)
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178
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179 The defects key is intended to collect parsing defects, which the message
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180 parser will subsequently dispose of as appropriate. The parser should not,
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181 insofar as practical, raise any errors. Defects should be added to the
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182 list instead. The standard header parsers register defects for RFC
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183 compliance issues, for obsolete RFC syntax, and for unrecoverable parsing
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184 errors.
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185
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186 The parse method may add additional keys to the dictionary. In this case
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187 the subclass must define an 'init' method, which will be passed the
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188 dictionary as its keyword arguments. The method should use (usually by
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189 setting them as the value of similarly named attributes) and remove all the
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190 extra keys added by its parse method, and then use super to call its parent
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191 class with the remaining arguments and keywords.
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192
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193 The subclass should also make sure that a 'max_count' attribute is defined
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194 that is either None or 1. XXX: need to better define this API.
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195
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196 """
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197
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198 def __new__(cls, name, value):
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199 kwds = {'defects': []}
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200 cls.parse(value, kwds)
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201 if utils._has_surrogates(kwds['decoded']):
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202 kwds['decoded'] = utils._sanitize(kwds['decoded'])
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203 self = str.__new__(cls, kwds['decoded'])
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204 # del kwds['decoded']
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205 self.init(name, **kwds)
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206 return self
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207
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208 def init(self, name, **_3to2kwargs):
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209 defects = _3to2kwargs['defects']; del _3to2kwargs['defects']
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210 parse_tree = _3to2kwargs['parse_tree']; del _3to2kwargs['parse_tree']
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211 self._name = name
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212 self._parse_tree = parse_tree
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213 self._defects = defects
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214
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215 @property
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216 def name(self):
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217 return self._name
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218
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219 @property
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220 def defects(self):
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221 return tuple(self._defects)
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222
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223 def __reduce__(self):
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224 return (
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225 _reconstruct_header,
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226 (
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227 self.__class__.__name__,
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228 self.__class__.__bases__,
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229 str(self),
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230 ),
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231 self.__dict__)
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232
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233 @classmethod
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234 def _reconstruct(cls, value):
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235 return str.__new__(cls, value)
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236
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237 def fold(self, **_3to2kwargs):
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238 policy = _3to2kwargs['policy']; del _3to2kwargs['policy']
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239 """Fold header according to policy.
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240
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241 The parsed representation of the header is folded according to
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242 RFC5322 rules, as modified by the policy. If the parse tree
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243 contains surrogateescaped bytes, the bytes are CTE encoded using
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244 the charset 'unknown-8bit".
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245
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246 Any non-ASCII characters in the parse tree are CTE encoded using
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247 charset utf-8. XXX: make this a policy setting.
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248
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249 The returned value is an ASCII-only string possibly containing linesep
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250 characters, and ending with a linesep character. The string includes
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251 the header name and the ': ' separator.
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252
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253 """
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254 # At some point we need to only put fws here if it was in the source.
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255 header = parser.Header([
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256 parser.HeaderLabel([
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257 parser.ValueTerminal(self.name, 'header-name'),
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258 parser.ValueTerminal(':', 'header-sep')]),
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259 parser.CFWSList([parser.WhiteSpaceTerminal(' ', 'fws')]),
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260 self._parse_tree])
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261 return header.fold(policy=policy)
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262
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263
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264 def _reconstruct_header(cls_name, bases, value):
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265 return type(text_to_native_str(cls_name), bases, {})._reconstruct(value)
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266
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267
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268 class UnstructuredHeader(object):
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269
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270 max_count = None
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271 value_parser = staticmethod(parser.get_unstructured)
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272
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273 @classmethod
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274 def parse(cls, value, kwds):
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275 kwds['parse_tree'] = cls.value_parser(value)
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276 kwds['decoded'] = str(kwds['parse_tree'])
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277
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278
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279 class UniqueUnstructuredHeader(UnstructuredHeader):
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280
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281 max_count = 1
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282
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283
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284 class DateHeader(object):
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285
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286 """Header whose value consists of a single timestamp.
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287
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288 Provides an additional attribute, datetime, which is either an aware
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289 datetime using a timezone, or a naive datetime if the timezone
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290 in the input string is -0000. Also accepts a datetime as input.
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291 The 'value' attribute is the normalized form of the timestamp,
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292 which means it is the output of format_datetime on the datetime.
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293 """
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294
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295 max_count = None
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296
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297 # This is used only for folding, not for creating 'decoded'.
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298 value_parser = staticmethod(parser.get_unstructured)
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299
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300 @classmethod
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301 def parse(cls, value, kwds):
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302 if not value:
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303 kwds['defects'].append(errors.HeaderMissingRequiredValue())
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304 kwds['datetime'] = None
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305 kwds['decoded'] = ''
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306 kwds['parse_tree'] = parser.TokenList()
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307 return
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308 if isinstance(value, str):
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309 value = utils.parsedate_to_datetime(value)
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310 kwds['datetime'] = value
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311 kwds['decoded'] = utils.format_datetime(kwds['datetime'])
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312 kwds['parse_tree'] = cls.value_parser(kwds['decoded'])
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313
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314 def init(self, *args, **kw):
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315 self._datetime = kw.pop('datetime')
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316 super().init(*args, **kw)
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317
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318 @property
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319 def datetime(self):
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320 return self._datetime
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321
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322
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323 class UniqueDateHeader(DateHeader):
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324
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325 max_count = 1
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326
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327
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328 class AddressHeader(object):
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329
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330 max_count = None
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331
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332 @staticmethod
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333 def value_parser(value):
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334 address_list, value = parser.get_address_list(value)
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335 assert not value, 'this should not happen'
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336 return address_list
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337
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338 @classmethod
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339 def parse(cls, value, kwds):
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340 if isinstance(value, str):
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341 # We are translating here from the RFC language (address/mailbox)
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342 # to our API language (group/address).
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343 kwds['parse_tree'] = address_list = cls.value_parser(value)
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344 groups = []
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345 for addr in address_list.addresses:
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346 groups.append(Group(addr.display_name,
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347 [Address(mb.display_name or '',
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348 mb.local_part or '',
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349 mb.domain or '')
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350 for mb in addr.all_mailboxes]))
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351 defects = list(address_list.all_defects)
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352 else:
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353 # Assume it is Address/Group stuff
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354 if not hasattr(value, '__iter__'):
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355 value = [value]
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356 groups = [Group(None, [item]) if not hasattr(item, 'addresses')
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357 else item
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358 for item in value]
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359 defects = []
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360 kwds['groups'] = groups
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361 kwds['defects'] = defects
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362 kwds['decoded'] = ', '.join([str(item) for item in groups])
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363 if 'parse_tree' not in kwds:
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364 kwds['parse_tree'] = cls.value_parser(kwds['decoded'])
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365
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366 def init(self, *args, **kw):
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367 self._groups = tuple(kw.pop('groups'))
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368 self._addresses = None
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369 super().init(*args, **kw)
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370
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371 @property
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372 def groups(self):
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373 return self._groups
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374
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375 @property
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376 def addresses(self):
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377 if self._addresses is None:
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378 self._addresses = tuple([address for group in self._groups
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379 for address in group.addresses])
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380 return self._addresses
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381
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382
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383 class UniqueAddressHeader(AddressHeader):
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384
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385 max_count = 1
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386
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387
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388 class SingleAddressHeader(AddressHeader):
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389
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390 @property
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391 def address(self):
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392 if len(self.addresses)!=1:
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393 raise ValueError(("value of single address header {} is not "
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394 "a single address").format(self.name))
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395 return self.addresses[0]
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396
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397
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398 class UniqueSingleAddressHeader(SingleAddressHeader):
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399
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400 max_count = 1
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401
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402
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403 class MIMEVersionHeader(object):
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404
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405 max_count = 1
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406
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407 value_parser = staticmethod(parser.parse_mime_version)
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408
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409 @classmethod
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410 def parse(cls, value, kwds):
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411 kwds['parse_tree'] = parse_tree = cls.value_parser(value)
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412 kwds['decoded'] = str(parse_tree)
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413 kwds['defects'].extend(parse_tree.all_defects)
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414 kwds['major'] = None if parse_tree.minor is None else parse_tree.major
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415 kwds['minor'] = parse_tree.minor
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416 if parse_tree.minor is not None:
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417 kwds['version'] = '{}.{}'.format(kwds['major'], kwds['minor'])
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418 else:
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419 kwds['version'] = None
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420
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421 def init(self, *args, **kw):
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422 self._version = kw.pop('version')
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423 self._major = kw.pop('major')
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424 self._minor = kw.pop('minor')
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425 super().init(*args, **kw)
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426
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427 @property
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428 def major(self):
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429 return self._major
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430
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431 @property
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432 def minor(self):
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433 return self._minor
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434
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435 @property
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436 def version(self):
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437 return self._version
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438
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439
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440 class ParameterizedMIMEHeader(object):
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441
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442 # Mixin that handles the params dict. Must be subclassed and
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443 # a property value_parser for the specific header provided.
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444
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445 max_count = 1
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446
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447 @classmethod
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448 def parse(cls, value, kwds):
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449 kwds['parse_tree'] = parse_tree = cls.value_parser(value)
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450 kwds['decoded'] = str(parse_tree)
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451 kwds['defects'].extend(parse_tree.all_defects)
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452 if parse_tree.params is None:
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453 kwds['params'] = {}
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454 else:
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455 # The MIME RFCs specify that parameter ordering is arbitrary.
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456 kwds['params'] = dict((utils._sanitize(name).lower(),
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457 utils._sanitize(value))
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458 for name, value in parse_tree.params)
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459
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460 def init(self, *args, **kw):
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461 self._params = kw.pop('params')
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462 super().init(*args, **kw)
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463
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464 @property
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465 def params(self):
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466 return self._params.copy()
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467
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468
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469 class ContentTypeHeader(ParameterizedMIMEHeader):
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470
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471 value_parser = staticmethod(parser.parse_content_type_header)
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472
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473 def init(self, *args, **kw):
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474 super().init(*args, **kw)
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475 self._maintype = utils._sanitize(self._parse_tree.maintype)
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476 self._subtype = utils._sanitize(self._parse_tree.subtype)
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477
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478 @property
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479 def maintype(self):
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480 return self._maintype
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481
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482 @property
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483 def subtype(self):
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484 return self._subtype
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485
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486 @property
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487 def content_type(self):
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488 return self.maintype + '/' + self.subtype
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489
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490
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491 class ContentDispositionHeader(ParameterizedMIMEHeader):
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492
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493 value_parser = staticmethod(parser.parse_content_disposition_header)
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494
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495 def init(self, *args, **kw):
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496 super().init(*args, **kw)
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497 cd = self._parse_tree.content_disposition
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498 self._content_disposition = cd if cd is None else utils._sanitize(cd)
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499
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500 @property
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501 def content_disposition(self):
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502 return self._content_disposition
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503
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504
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505 class ContentTransferEncodingHeader(object):
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506
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507 max_count = 1
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508
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509 value_parser = staticmethod(parser.parse_content_transfer_encoding_header)
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510
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511 @classmethod
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512 def parse(cls, value, kwds):
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513 kwds['parse_tree'] = parse_tree = cls.value_parser(value)
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514 kwds['decoded'] = str(parse_tree)
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515 kwds['defects'].extend(parse_tree.all_defects)
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516
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517 def init(self, *args, **kw):
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518 super().init(*args, **kw)
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519 self._cte = utils._sanitize(self._parse_tree.cte)
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520
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521 @property
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522 def cte(self):
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523 return self._cte
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524
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525
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526 # The header factory #
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527
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528 _default_header_map = {
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529 'subject': UniqueUnstructuredHeader,
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530 'date': UniqueDateHeader,
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531 'resent-date': DateHeader,
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532 'orig-date': UniqueDateHeader,
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533 'sender': UniqueSingleAddressHeader,
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534 'resent-sender': SingleAddressHeader,
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535 'to': UniqueAddressHeader,
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536 'resent-to': AddressHeader,
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537 'cc': UniqueAddressHeader,
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538 'resent-cc': AddressHeader,
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539 'bcc': UniqueAddressHeader,
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540 'resent-bcc': AddressHeader,
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541 'from': UniqueAddressHeader,
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542 'resent-from': AddressHeader,
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543 'reply-to': UniqueAddressHeader,
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544 'mime-version': MIMEVersionHeader,
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545 'content-type': ContentTypeHeader,
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546 'content-disposition': ContentDispositionHeader,
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547 'content-transfer-encoding': ContentTransferEncodingHeader,
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548 }
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549
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550 class HeaderRegistry(object):
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551
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552 """A header_factory and header registry."""
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553
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554 def __init__(self, base_class=BaseHeader, default_class=UnstructuredHeader,
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555 use_default_map=True):
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556 """Create a header_factory that works with the Policy API.
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557
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558 base_class is the class that will be the last class in the created
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559 header class's __bases__ list. default_class is the class that will be
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560 used if "name" (see __call__) does not appear in the registry.
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561 use_default_map controls whether or not the default mapping of names to
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562 specialized classes is copied in to the registry when the factory is
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563 created. The default is True.
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564
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565 """
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566 self.registry = {}
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567 self.base_class = base_class
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568 self.default_class = default_class
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569 if use_default_map:
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570 self.registry.update(_default_header_map)
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571
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572 def map_to_type(self, name, cls):
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573 """Register cls as the specialized class for handling "name" headers.
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574
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575 """
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576 self.registry[name.lower()] = cls
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577
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578 def __getitem__(self, name):
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579 cls = self.registry.get(name.lower(), self.default_class)
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580 return type(text_to_native_str('_'+cls.__name__), (cls, self.base_class), {})
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581
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582 def __call__(self, name, value):
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583 """Create a header instance for header 'name' from 'value'.
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584
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585 Creates a header instance by creating a specialized class for parsing
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586 and representing the specified header by combining the factory
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587 base_class with a specialized class from the registry or the
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588 default_class, and passing the name and value to the constructed
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589 class's constructor.
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590
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591 """
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592 return self[name](name, value)