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For_More_Tools:
from __future__ import absolute_import
import binascii
import codecs
import os
from io import BytesIO
from .fields import RequestField
import six
from six import b
writer = codecs.lookup("utf-8")[3]
def choose_boundary():
"""
Our embarrassingly-simple replacement for mimetools.choose_boundary.
"""
boundary = binascii.hexlify(os.urandom(16))
if not six.PY2:
boundary = boundary.decode("ascii")
return boundary
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):
"""
.. deprecated:: 1.6
Iterate over fields.
The addition of :class:`~urllib3.fields.RequestField` makes this function
obsolete. Instead, use :func:`iter_field_objects`, which returns
:class:`~urllib3.fields.RequestField` objects.
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:`urllib3.filepost.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