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annotate venv/lib/python2.7/site-packages/requests_toolbelt/multipart/decoder.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 # -*- coding: utf-8 -*-
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2 """
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3
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4 requests_toolbelt.multipart.decoder
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5 ===================================
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6
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7 This holds all the implementation details of the MultipartDecoder
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8
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9 """
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10
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11 import sys
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12 import email.parser
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13 from .encoder import encode_with
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14 from requests.structures import CaseInsensitiveDict
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15
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16
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17 def _split_on_find(content, bound):
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18 point = content.find(bound)
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19 return content[:point], content[point + len(bound):]
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20
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21
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22 class ImproperBodyPartContentException(Exception):
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23 pass
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24
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25
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26 class NonMultipartContentTypeException(Exception):
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27 pass
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28
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29
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30 def _header_parser(string, encoding):
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31 major = sys.version_info[0]
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32 if major == 3:
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33 string = string.decode(encoding)
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34 headers = email.parser.HeaderParser().parsestr(string).items()
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35 return (
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36 (encode_with(k, encoding), encode_with(v, encoding))
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37 for k, v in headers
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38 )
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39
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40
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41 class BodyPart(object):
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42 """
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43
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44 The ``BodyPart`` object is a ``Response``-like interface to an individual
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45 subpart of a multipart response. It is expected that these will
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46 generally be created by objects of the ``MultipartDecoder`` class.
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47
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48 Like ``Response``, there is a ``CaseInsensitiveDict`` object named header,
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49 ``content`` to access bytes, ``text`` to access unicode, and ``encoding``
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50 to access the unicode codec.
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51
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52 """
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53
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54 def __init__(self, content, encoding):
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55 self.encoding = encoding
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56 headers = {}
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57 # Split into header section (if any) and the content
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58 if b'\r\n\r\n' in content:
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59 first, self.content = _split_on_find(content, b'\r\n\r\n')
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60 if first != b'':
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61 headers = _header_parser(first.lstrip(), encoding)
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62 else:
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63 raise ImproperBodyPartContentException(
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64 'content does not contain CR-LF-CR-LF'
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65 )
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66 self.headers = CaseInsensitiveDict(headers)
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67
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68 @property
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69 def text(self):
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70 """Content of the ``BodyPart`` in unicode."""
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71 return self.content.decode(self.encoding)
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72
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73
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74 class MultipartDecoder(object):
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75 """
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76
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77 The ``MultipartDecoder`` object parses the multipart payload of
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78 a bytestring into a tuple of ``Response``-like ``BodyPart`` objects.
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79
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80 The basic usage is::
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81
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82 import requests
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83 from requests_toolbelt import MultipartDecoder
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84
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85 response = request.get(url)
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86 decoder = MultipartDecoder.from_response(response)
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87 for part in decoder.parts:
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88 print(part.header['content-type'])
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89
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90 If the multipart content is not from a response, basic usage is::
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91
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92 from requests_toolbelt import MultipartDecoder
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93
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94 decoder = MultipartDecoder(content, content_type)
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95 for part in decoder.parts:
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96 print(part.header['content-type'])
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97
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98 For both these usages, there is an optional ``encoding`` parameter. This is
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99 a string, which is the name of the unicode codec to use (default is
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100 ``'utf-8'``).
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101
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102 """
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103 def __init__(self, content, content_type, encoding='utf-8'):
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104 #: Original content
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105 self.content = content
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106 #: Original Content-Type header
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107 self.content_type = content_type
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108 #: Response body encoding
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109 self.encoding = encoding
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110 #: Parsed parts of the multipart response body
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111 self.parts = tuple()
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112 self._find_boundary()
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113 self._parse_body()
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114
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115 def _find_boundary(self):
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116 ct_info = tuple(x.strip() for x in self.content_type.split(';'))
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117 mimetype = ct_info[0]
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118 if mimetype.split('/')[0] != 'multipart':
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119 raise NonMultipartContentTypeException(
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120 "Unexpected mimetype in content-type: '{0}'".format(mimetype)
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121 )
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122 for item in ct_info[1:]:
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123 attr, value = _split_on_find(
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124 item,
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125 '='
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126 )
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127 if attr.lower() == 'boundary':
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128 self.boundary = encode_with(value.strip('"'), self.encoding)
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129
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130 @staticmethod
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131 def _fix_first_part(part, boundary_marker):
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132 bm_len = len(boundary_marker)
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133 if boundary_marker == part[:bm_len]:
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134 return part[bm_len:]
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135 else:
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136 return part
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137
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138 def _parse_body(self):
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139 boundary = b''.join((b'--', self.boundary))
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140
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141 def body_part(part):
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142 fixed = MultipartDecoder._fix_first_part(part, boundary)
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143 return BodyPart(fixed, self.encoding)
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144
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145 def test_part(part):
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146 return part != b'' and part != b'\r\n' and part[:4] != b'--\r\n'
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147
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148 parts = self.content.split(b''.join((b'\r\n', boundary)))
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149 self.parts = tuple(body_part(x) for x in parts if test_part(x))
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150
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151 @classmethod
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152 def from_response(cls, response, encoding='utf-8'):
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153 content = response.content
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154 content_type = response.headers.get('content-type', None)
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155 return cls(content, content_type, encoding)