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90 lines
2.3 KiB
Python
90 lines
2.3 KiB
Python
from __future__ import annotations
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import binascii
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import codecs
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import os
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import typing
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from io import BytesIO
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from .fields import _TYPE_FIELD_VALUE_TUPLE, RequestField
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writer = codecs.lookup("utf-8")[3]
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_TYPE_FIELDS_SEQUENCE = typing.Sequence[
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typing.Union[tuple[str, _TYPE_FIELD_VALUE_TUPLE], RequestField]
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]
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_TYPE_FIELDS = typing.Union[
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_TYPE_FIELDS_SEQUENCE,
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typing.Mapping[str, _TYPE_FIELD_VALUE_TUPLE],
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]
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def choose_boundary() -> str:
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"""
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Our embarrassingly-simple replacement for mimetools.choose_boundary.
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"""
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return binascii.hexlify(os.urandom(16)).decode()
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def iter_field_objects(fields: _TYPE_FIELDS) -> typing.Iterable[RequestField]:
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"""
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Iterate over fields.
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Supports list of (k, v) tuples and dicts, and lists of
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:class:`~urllib3.fields.RequestField`.
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"""
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iterable: typing.Iterable[RequestField | tuple[str, _TYPE_FIELD_VALUE_TUPLE]]
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if isinstance(fields, typing.Mapping):
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iterable = fields.items()
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else:
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iterable = fields
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for field in iterable:
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if isinstance(field, RequestField):
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yield field
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else:
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yield RequestField.from_tuples(*field)
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def encode_multipart_formdata(
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fields: _TYPE_FIELDS, boundary: str | None = None
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) -> tuple[bytes, str]:
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"""
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Encode a dictionary of ``fields`` using the multipart/form-data MIME format.
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:param fields:
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Dictionary of fields or list of (key, :class:`~urllib3.fields.RequestField`).
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Values are processed by :func:`urllib3.fields.RequestField.from_tuples`.
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:param boundary:
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If not specified, then a random boundary will be generated using
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:func:`urllib3.filepost.choose_boundary`.
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"""
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body = BytesIO()
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if boundary is None:
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boundary = choose_boundary()
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for field in iter_field_objects(fields):
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body.write(f"--{boundary}\r\n".encode("latin-1"))
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writer(body).write(field.render_headers())
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data = field.data
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if isinstance(data, int):
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data = str(data) # Backwards compatibility
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if isinstance(data, str):
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writer(body).write(data)
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else:
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body.write(data)
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body.write(b"\r\n")
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body.write(f"--{boundary}--\r\n".encode("latin-1"))
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content_type = f"multipart/form-data; boundary={boundary}"
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return body.getvalue(), content_type
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