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178 lines
5.8 KiB
Python
178 lines
5.8 KiB
Python
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# urllib3/fields.py
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# Copyright 2008-2013 Andrey Petrov and contributors (see CONTRIBUTORS.txt)
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#
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# This module is part of urllib3 and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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import email.utils
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import mimetypes
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from .packages import six
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def guess_content_type(filename, default='application/octet-stream'):
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"""
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Guess the "Content-Type" of a file.
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:param filename:
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The filename to guess the "Content-Type" of using :mod:`mimetypes`.
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:param default:
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If no "Content-Type" can be guessed, default to `default`.
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"""
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if filename:
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return mimetypes.guess_type(filename)[0] or default
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return default
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def format_header_param(name, value):
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"""
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Helper function to format and quote a single header parameter.
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Particularly useful for header parameters which might contain
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non-ASCII values, like file names. This follows RFC 2231, as
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suggested by RFC 2388 Section 4.4.
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:param name:
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The name of the parameter, a string expected to be ASCII only.
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:param value:
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The value of the parameter, provided as a unicode string.
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"""
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if not any(ch in value for ch in '"\\\r\n'):
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result = '%s="%s"' % (name, value)
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try:
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result.encode('ascii')
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except UnicodeEncodeError:
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pass
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else:
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return result
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if not six.PY3: # Python 2:
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value = value.encode('utf-8')
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value = email.utils.encode_rfc2231(value, 'utf-8')
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value = '%s*=%s' % (name, value)
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return value
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class RequestField(object):
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"""
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A data container for request body parameters.
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:param name:
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The name of this request field.
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:param data:
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The data/value body.
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:param filename:
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An optional filename of the request field.
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:param headers:
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An optional dict-like object of headers to initially use for the field.
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"""
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def __init__(self, name, data, filename=None, headers=None):
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self._name = name
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self._filename = filename
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self.data = data
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self.headers = {}
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if headers:
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self.headers = dict(headers)
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@classmethod
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def from_tuples(cls, fieldname, value):
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"""
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A :class:`~urllib3.fields.RequestField` factory from old-style tuple parameters.
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Supports constructing :class:`~urllib3.fields.RequestField` from parameter
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of key/value strings AND key/filetuple. A filetuple is a (filename, data, MIME type)
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tuple where the MIME type is optional. For example: ::
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'foo': 'bar',
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'fakefile': ('foofile.txt', 'contents of foofile'),
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'realfile': ('barfile.txt', open('realfile').read()),
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'typedfile': ('bazfile.bin', open('bazfile').read(), 'image/jpeg'),
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'nonamefile': 'contents of nonamefile field',
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Field names and filenames must be unicode.
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"""
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if isinstance(value, tuple):
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if len(value) == 3:
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filename, data, content_type = value
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else:
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filename, data = value
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content_type = guess_content_type(filename)
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else:
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filename = None
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content_type = None
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data = value
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request_param = cls(fieldname, data, filename=filename)
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request_param.make_multipart(content_type=content_type)
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return request_param
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def _render_part(self, name, value):
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"""
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Overridable helper function to format a single header parameter.
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:param name:
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The name of the parameter, a string expected to be ASCII only.
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:param value:
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The value of the parameter, provided as a unicode string.
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"""
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return format_header_param(name, value)
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def _render_parts(self, header_parts):
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"""
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Helper function to format and quote a single header.
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Useful for single headers that are composed of multiple items. E.g.,
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'Content-Disposition' fields.
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:param header_parts:
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A sequence of (k, v) typles or a :class:`dict` of (k, v) to format as
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`k1="v1"; k2="v2"; ...`.
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"""
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parts = []
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iterable = header_parts
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if isinstance(header_parts, dict):
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iterable = header_parts.items()
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for name, value in iterable:
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if value:
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parts.append(self._render_part(name, value))
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return '; '.join(parts)
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def render_headers(self):
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"""
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Renders the headers for this request field.
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"""
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lines = []
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sort_keys = ['Content-Disposition', 'Content-Type', 'Content-Location']
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for sort_key in sort_keys:
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if self.headers.get(sort_key, False):
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lines.append('%s: %s' % (sort_key, self.headers[sort_key]))
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for header_name, header_value in self.headers.items():
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if header_name not in sort_keys:
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if header_value:
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lines.append('%s: %s' % (header_name, header_value))
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lines.append('\r\n')
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return '\r\n'.join(lines)
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def make_multipart(self, content_disposition=None, content_type=None, content_location=None):
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"""
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Makes this request field into a multipart request field.
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This method overrides "Content-Disposition", "Content-Type" and
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"Content-Location" headers to the request parameter.
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:param content_type:
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The 'Content-Type' of the request body.
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:param content_location:
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The 'Content-Location' of the request body.
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"""
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self.headers['Content-Disposition'] = content_disposition or 'form-data'
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self.headers['Content-Disposition'] += '; '.join(['', self._render_parts((('name', self._name), ('filename', self._filename)))])
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self.headers['Content-Type'] = content_type
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self.headers['Content-Location'] = content_location
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