Add 'requests' library to third_party.

third_party/requests/packages/urllib3/filepost.py

+# 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) or (key, value, MIME type)
+        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 and a suitable MIME type is guessed based on the
+        filename. If the value is a tuple of three elements, then the third
+        element is treated as an explicit MIME type 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):
+            if len(value) == 3:
+                filename, data, content_type = value
+            else:
+                filename, data = value
+                content_type = get_content_type(filename)
+            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' %
+                       (content_type,)))
+        else:
+            data = value
+            writer(body).write('Content-Disposition: form-data; name="%s"\r\n'
+                               % (fieldname))
+            body.write(b'\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 = str('multipart/form-data; boundary=%s' % boundary)
+
+    return body.getvalue(), content_type