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# urllib3/filepost.py
# Copyright 2008-2013 Andrey Petrov and contributors (see CONTRIBUTORS.txt)
#
# This module is part of urllib3 and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
import codecs
import mimetypes
from uuid import uuid4
from io import BytesIO
import six
from six import b
from .fields import RequestField
writer = codecs.lookup('utf-8')[3]
def choose_boundary():
"""
Our embarassingly-simple replacement for mimetools.choose_boundary.
"""
return uuid4().hex
def iter_field_objects(fields):
"""
Iterate over fields.
Supports list of (k, v) tuples and dicts, and lists of
:class:`~urllib3.fields.RequestField`.
"""
if isinstance(fields, dict):
i = six.iteritems(fields)
else:
i = iter(fields)
for field in i:
if isinstance(field, RequestField):
yield field
else:
yield RequestField.from_tuples(*field)
def iter_fields(fields):
"""
Iterate over fields.
.. deprecated ::
The addition of `~urllib3.fields.RequestField` makes this function
obsolete. Instead, use :func:`iter_field_objects`, which returns
`~urllib3.fields.RequestField` objects, instead.
Supports list of (k, v) tuples and dicts.
"""
if isinstance(fields, dict):
return ((k, v) for k, v in six.iteritems(fields))
return ((k, v) for k, v in fields)
def encode_multipart_formdata(fields, boundary=None):
"""
Encode a dictionary of ``fields`` using the multipart/form-data MIME format.
:param fields:
Dictionary of fields or list of (key, :class:`~urllib3.fields.RequestField`).
:param boundary:
If not specified, then a random boundary will be generated using
:func:`mimetools.choose_boundary`.
"""
body = BytesIO()
if boundary is None:
boundary = choose_boundary()
for field in iter_field_objects(fields):
body.write(b('--%s\r\n' % (boundary)))
writer(body).write(field.render_headers())
data = field.data
if isinstance(data, int):
data = str(data) # Backwards compatibility
if isinstance(data, six.text_type):
writer(body).write(data)
else:
body.write(data)
body.write(b'\r\n')
body.write(b('--%s--\r\n' % (boundary)))
content_type = str('multipart/form-data; boundary=%s' % boundary)
return body.getvalue(), content_type