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Side by Side Diff: swarm_client/third_party/requests/packages/urllib3/fields.py

Issue 69143004: Delete swarm_client. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/tools/
Patch Set: Created 7 years, 1 month ago
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1 # urllib3/fields.py
2 # Copyright 2008-2013 Andrey Petrov and contributors (see CONTRIBUTORS.txt)
3 #
4 # This module is part of urllib3 and is released under
5 # the MIT License: http://www.opensource.org/licenses/mit-license.php
6
7 import email.utils
8 import mimetypes
9
10 from .packages import six
11
12
13 def guess_content_type(filename, default='application/octet-stream'):
14 """
15 Guess the "Content-Type" of a file.
16
17 :param filename:
18 The filename to guess the "Content-Type" of using :mod:`mimetimes`.
19 :param default:
20 If no "Content-Type" can be guessed, default to `default`.
21 """
22 if filename:
23 return mimetypes.guess_type(filename)[0] or default
24 return default
25
26
27 def format_header_param(name, value):
28 """
29 Helper function to format and quote a single header parameter.
30
31 Particularly useful for header parameters which might contain
32 non-ASCII values, like file names. This follows RFC 2231, as
33 suggested by RFC 2388 Section 4.4.
34
35 :param name:
36 The name of the parameter, a string expected to be ASCII only.
37 :param value:
38 The value of the parameter, provided as a unicode string.
39 """
40 if not any(ch in value for ch in '"\\\r\n'):
41 result = '%s="%s"' % (name, value)
42 try:
43 result.encode('ascii')
44 except UnicodeEncodeError:
45 pass
46 else:
47 return result
48 if not six.PY3: # Python 2:
49 value = value.encode('utf-8')
50 value = email.utils.encode_rfc2231(value, 'utf-8')
51 value = '%s*=%s' % (name, value)
52 return value
53
54
55 class RequestField(object):
56 """
57 A data container for request body parameters.
58
59 :param name:
60 The name of this request field.
61 :param data:
62 The data/value body.
63 :param filename:
64 An optional filename of the request field.
65 :param headers:
66 An optional dict-like object of headers to initially use for the field.
67 """
68 def __init__(self, name, data, filename=None, headers=None):
69 self._name = name
70 self._filename = filename
71 self.data = data
72 self.headers = {}
73 if headers:
74 self.headers = dict(headers)
75
76 @classmethod
77 def from_tuples(cls, fieldname, value):
78 """
79 A :class:`~urllib3.fields.RequestField` factory from old-style tuple par ameters.
80
81 Supports constructing :class:`~urllib3.fields.RequestField` from paramet er
82 of key/value strings AND key/filetuple. A filetuple is a (filename, data , MIME type)
83 tuple where the MIME type is optional. For example: ::
84
85 'foo': 'bar',
86 'fakefile': ('foofile.txt', 'contents of foofile'),
87 'realfile': ('barfile.txt', open('realfile').read()),
88 'typedfile': ('bazfile.bin', open('bazfile').read(), 'image/jpeg'),
89 'nonamefile': 'contents of nonamefile field',
90
91 Field names and filenames must be unicode.
92 """
93 if isinstance(value, tuple):
94 if len(value) == 3:
95 filename, data, content_type = value
96 else:
97 filename, data = value
98 content_type = guess_content_type(filename)
99 else:
100 filename = None
101 content_type = None
102 data = value
103
104 request_param = cls(fieldname, data, filename=filename)
105 request_param.make_multipart(content_type=content_type)
106
107 return request_param
108
109 def _render_part(self, name, value):
110 """
111 Overridable helper function to format a single header parameter.
112
113 :param name:
114 The name of the parameter, a string expected to be ASCII only.
115 :param value:
116 The value of the parameter, provided as a unicode string.
117 """
118 return format_header_param(name, value)
119
120 def _render_parts(self, header_parts):
121 """
122 Helper function to format and quote a single header.
123
124 Useful for single headers that are composed of multiple items. E.g.,
125 'Content-Disposition' fields.
126
127 :param header_parts:
128 A sequence of (k, v) typles or a :class:`dict` of (k, v) to format a s
129 `k1="v1"; k2="v2"; ...`.
130 """
131 parts = []
132 iterable = header_parts
133 if isinstance(header_parts, dict):
134 iterable = header_parts.items()
135
136 for name, value in iterable:
137 if value:
138 parts.append(self._render_part(name, value))
139
140 return '; '.join(parts)
141
142 def render_headers(self):
143 """
144 Renders the headers for this request field.
145 """
146 lines = []
147
148 sort_keys = ['Content-Disposition', 'Content-Type', 'Content-Location']
149 for sort_key in sort_keys:
150 if self.headers.get(sort_key, False):
151 lines.append('%s: %s' % (sort_key, self.headers[sort_key]))
152
153 for header_name, header_value in self.headers.items():
154 if header_name not in sort_keys:
155 if header_value:
156 lines.append('%s: %s' % (header_name, header_value))
157
158 lines.append('\r\n')
159 return '\r\n'.join(lines)
160
161 def make_multipart(self, content_disposition=None, content_type=None, conten t_location=None):
162 """
163 Makes this request field into a multipart request field.
164
165 This method overrides "Content-Disposition", "Content-Type" and
166 "Content-Location" headers to the request parameter.
167
168 :param content_type:
169 The 'Content-Type' of the request body.
170 :param content_location:
171 The 'Content-Location' of the request body.
172
173 """
174 self.headers['Content-Disposition'] = content_disposition or 'form-data'
175 self.headers['Content-Disposition'] += '; '.join(['', self._render_parts ((('name', self._name), ('filename', self._filename)))])
176 self.headers['Content-Type'] = content_type
177 self.headers['Content-Location'] = content_location
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