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# urllib3/filepost.py
# Copyright 2008-2012 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
from .packages import six
from .packages.six import b
writer = codecs.lookup('utf-8')[3]
def choose_boundary():
"""
Our embarassingly-simple replacement for mimetools.choose_boundary.
"""
return uuid4().hex
def get_content_type(filename):
return mimetypes.guess_type(filename)[0] or 'application/octet-stream'
def iter_fields(fields):
"""
Iterate over fields.
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, value) field tuples. The key is
treated as the field name, and the value as the body of the form-data
bytes. If the value is a tuple of two elements, then the first element
is treated as the filename of the form-data section.
Field names and filenames must be unicode.
: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 fieldname, value in iter_fields(fields):
body.write(b('--%s\r\n' % (boundary)))
if isinstance(value, tuple):
filename, data = value
writer(body).write('Content-Disposition: form-data; name="%s"; '
'filename="%s"\r\n' % (fieldname, filename))
body.write(b('Content-Type: %s\r\n\r\n' %
(get_content_type(filename))))
else:
data = value
writer(body).write('Content-Disposition: form-data; name="%s"\r\n'
% (fieldname))
body.write(b'Content-Type: text/plain\r\n\r\n')
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 = b('multipart/form-data; boundary=%s' % boundary)
return body.getvalue(), content_type
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