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annotate lib/python3.8/site-packages/pip/_vendor/urllib3/fields.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 from __future__ import absolute_import
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2 import email.utils
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3 import mimetypes
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4 import re
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5
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6 from .packages import six
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7
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8
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9 def guess_content_type(filename, default="application/octet-stream"):
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10 """
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11 Guess the "Content-Type" of a file.
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12
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13 :param filename:
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14 The filename to guess the "Content-Type" of using :mod:`mimetypes`.
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15 :param default:
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16 If no "Content-Type" can be guessed, default to `default`.
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17 """
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18 if filename:
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19 return mimetypes.guess_type(filename)[0] or default
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20 return default
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21
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22
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23 def format_header_param_rfc2231(name, value):
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24 """
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25 Helper function to format and quote a single header parameter using the
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26 strategy defined in RFC 2231.
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27
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28 Particularly useful for header parameters which might contain
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29 non-ASCII values, like file names. This follows RFC 2388 Section 4.4.
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30
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31 :param name:
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32 The name of the parameter, a string expected to be ASCII only.
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33 :param value:
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34 The value of the parameter, provided as ``bytes`` or `str``.
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35 :ret:
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36 An RFC-2231-formatted unicode string.
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37 """
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38 if isinstance(value, six.binary_type):
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39 value = value.decode("utf-8")
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40
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41 if not any(ch in value for ch in '"\\\r\n'):
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42 result = u'%s="%s"' % (name, value)
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43 try:
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44 result.encode("ascii")
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45 except (UnicodeEncodeError, UnicodeDecodeError):
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46 pass
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47 else:
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48 return result
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49
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50 if six.PY2: # Python 2:
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51 value = value.encode("utf-8")
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52
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53 # encode_rfc2231 accepts an encoded string and returns an ascii-encoded
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54 # string in Python 2 but accepts and returns unicode strings in Python 3
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55 value = email.utils.encode_rfc2231(value, "utf-8")
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56 value = "%s*=%s" % (name, value)
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57
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58 if six.PY2: # Python 2:
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59 value = value.decode("utf-8")
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60
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61 return value
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62
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63
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64 _HTML5_REPLACEMENTS = {
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65 u"\u0022": u"%22",
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66 # Replace "\" with "\\".
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67 u"\u005C": u"\u005C\u005C",
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68 u"\u005C": u"\u005C\u005C",
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69 }
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70
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71 # All control characters from 0x00 to 0x1F *except* 0x1B.
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72 _HTML5_REPLACEMENTS.update(
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73 {
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74 six.unichr(cc): u"%{:02X}".format(cc)
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75 for cc in range(0x00, 0x1F + 1)
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76 if cc not in (0x1B,)
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77 }
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78 )
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79
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80
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81 def _replace_multiple(value, needles_and_replacements):
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82 def replacer(match):
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83 return needles_and_replacements[match.group(0)]
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84
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85 pattern = re.compile(
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86 r"|".join([re.escape(needle) for needle in needles_and_replacements.keys()])
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87 )
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88
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89 result = pattern.sub(replacer, value)
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90
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91 return result
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92
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93
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94 def format_header_param_html5(name, value):
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95 """
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96 Helper function to format and quote a single header parameter using the
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97 HTML5 strategy.
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98
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99 Particularly useful for header parameters which might contain
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100 non-ASCII values, like file names. This follows the `HTML5 Working Draft
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101 Section 4.10.22.7`_ and matches the behavior of curl and modern browsers.
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102
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103 .. _HTML5 Working Draft Section 4.10.22.7:
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104 https://w3c.github.io/html/sec-forms.html#multipart-form-data
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105
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106 :param name:
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107 The name of the parameter, a string expected to be ASCII only.
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108 :param value:
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109 The value of the parameter, provided as ``bytes`` or `str``.
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110 :ret:
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111 A unicode string, stripped of troublesome characters.
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112 """
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113 if isinstance(value, six.binary_type):
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114 value = value.decode("utf-8")
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115
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116 value = _replace_multiple(value, _HTML5_REPLACEMENTS)
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117
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118 return u'%s="%s"' % (name, value)
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119
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120
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121 # For backwards-compatibility.
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122 format_header_param = format_header_param_html5
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123
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124
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125 class RequestField(object):
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126 """
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127 A data container for request body parameters.
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128
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129 :param name:
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130 The name of this request field. Must be unicode.
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131 :param data:
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132 The data/value body.
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133 :param filename:
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134 An optional filename of the request field. Must be unicode.
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135 :param headers:
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136 An optional dict-like object of headers to initially use for the field.
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137 :param header_formatter:
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138 An optional callable that is used to encode and format the headers. By
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139 default, this is :func:`format_header_param_html5`.
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140 """
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141
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142 def __init__(
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143 self,
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144 name,
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145 data,
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146 filename=None,
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147 headers=None,
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148 header_formatter=format_header_param_html5,
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149 ):
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150 self._name = name
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151 self._filename = filename
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152 self.data = data
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153 self.headers = {}
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154 if headers:
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155 self.headers = dict(headers)
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156 self.header_formatter = header_formatter
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157
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158 @classmethod
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159 def from_tuples(cls, fieldname, value, header_formatter=format_header_param_html5):
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160 """
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161 A :class:`~urllib3.fields.RequestField` factory from old-style tuple parameters.
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162
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163 Supports constructing :class:`~urllib3.fields.RequestField` from
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164 parameter of key/value strings AND key/filetuple. A filetuple is a
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165 (filename, data, MIME type) tuple where the MIME type is optional.
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166 For example::
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167
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168 'foo': 'bar',
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169 'fakefile': ('foofile.txt', 'contents of foofile'),
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170 'realfile': ('barfile.txt', open('realfile').read()),
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171 'typedfile': ('bazfile.bin', open('bazfile').read(), 'image/jpeg'),
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172 'nonamefile': 'contents of nonamefile field',
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173
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174 Field names and filenames must be unicode.
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175 """
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176 if isinstance(value, tuple):
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177 if len(value) == 3:
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178 filename, data, content_type = value
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179 else:
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180 filename, data = value
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181 content_type = guess_content_type(filename)
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182 else:
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183 filename = None
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184 content_type = None
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185 data = value
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186
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187 request_param = cls(
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188 fieldname, data, filename=filename, header_formatter=header_formatter
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189 )
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190 request_param.make_multipart(content_type=content_type)
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191
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192 return request_param
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193
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194 def _render_part(self, name, value):
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195 """
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196 Overridable helper function to format a single header parameter. By
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197 default, this calls ``self.header_formatter``.
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198
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199 :param name:
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200 The name of the parameter, a string expected to be ASCII only.
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201 :param value:
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202 The value of the parameter, provided as a unicode string.
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203 """
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204
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205 return self.header_formatter(name, value)
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206
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207 def _render_parts(self, header_parts):
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208 """
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209 Helper function to format and quote a single header.
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210
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211 Useful for single headers that are composed of multiple items. E.g.,
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212 'Content-Disposition' fields.
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213
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214 :param header_parts:
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215 A sequence of (k, v) tuples or a :class:`dict` of (k, v) to format
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216 as `k1="v1"; k2="v2"; ...`.
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217 """
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218 parts = []
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219 iterable = header_parts
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220 if isinstance(header_parts, dict):
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221 iterable = header_parts.items()
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222
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223 for name, value in iterable:
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224 if value is not None:
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225 parts.append(self._render_part(name, value))
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226
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227 return u"; ".join(parts)
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228
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229 def render_headers(self):
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230 """
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231 Renders the headers for this request field.
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232 """
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233 lines = []
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234
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235 sort_keys = ["Content-Disposition", "Content-Type", "Content-Location"]
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236 for sort_key in sort_keys:
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237 if self.headers.get(sort_key, False):
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238 lines.append(u"%s: %s" % (sort_key, self.headers[sort_key]))
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239
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240 for header_name, header_value in self.headers.items():
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241 if header_name not in sort_keys:
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242 if header_value:
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243 lines.append(u"%s: %s" % (header_name, header_value))
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244
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245 lines.append(u"\r\n")
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246 return u"\r\n".join(lines)
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247
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248 def make_multipart(
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249 self, content_disposition=None, content_type=None, content_location=None
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250 ):
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251 """
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252 Makes this request field into a multipart request field.
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253
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254 This method overrides "Content-Disposition", "Content-Type" and
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255 "Content-Location" headers to the request parameter.
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256
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257 :param content_type:
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258 The 'Content-Type' of the request body.
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259 :param content_location:
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260 The 'Content-Location' of the request body.
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261
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262 """
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263 self.headers["Content-Disposition"] = content_disposition or u"form-data"
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264 self.headers["Content-Disposition"] += u"; ".join(
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265 [
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266 u"",
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267 self._render_parts(
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268 ((u"name", self._name), (u"filename", self._filename))
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269 ),
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270 ]
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271 )
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272 self.headers["Content-Type"] = content_type
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273 self.headers["Content-Location"] = content_location