346 lines
11 KiB
Python
346 lines
11 KiB
Python
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from __future__ import annotations
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import email.utils
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import mimetypes
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import typing
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_TYPE_FIELD_VALUE = typing.Union[str, bytes]
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_TYPE_FIELD_VALUE_TUPLE = typing.Union[
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_TYPE_FIELD_VALUE,
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typing.Tuple[str, _TYPE_FIELD_VALUE],
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typing.Tuple[str, _TYPE_FIELD_VALUE, str],
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]
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def guess_content_type(
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filename: str | None, default: str = "application/octet-stream"
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) -> str:
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"""
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Guess the "Content-Type" of a file.
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:param filename:
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The filename to guess the "Content-Type" of using :mod:`mimetypes`.
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:param default:
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If no "Content-Type" can be guessed, default to `default`.
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"""
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if filename:
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return mimetypes.guess_type(filename)[0] or default
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return default
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def format_header_param_rfc2231(name: str, value: _TYPE_FIELD_VALUE) -> str:
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"""
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Helper function to format and quote a single header parameter using the
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strategy defined in RFC 2231.
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Particularly useful for header parameters which might contain
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non-ASCII values, like file names. This follows
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`RFC 2388 Section 4.4 <https://tools.ietf.org/html/rfc2388#section-4.4>`_.
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:param name:
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The name of the parameter, a string expected to be ASCII only.
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:param value:
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The value of the parameter, provided as ``bytes`` or `str``.
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:returns:
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An RFC-2231-formatted unicode string.
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.. deprecated:: 2.0.0
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Will be removed in urllib3 v2.1.0. This is not valid for
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``multipart/form-data`` header parameters.
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"""
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import warnings
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warnings.warn(
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"'format_header_param_rfc2231' is deprecated and will be "
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"removed in urllib3 v2.1.0. This is not valid for "
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"multipart/form-data header parameters.",
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DeprecationWarning,
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stacklevel=2,
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)
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if isinstance(value, bytes):
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value = value.decode("utf-8")
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if not any(ch in value for ch in '"\\\r\n'):
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result = f'{name}="{value}"'
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try:
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result.encode("ascii")
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except (UnicodeEncodeError, UnicodeDecodeError):
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pass
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else:
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return result
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value = email.utils.encode_rfc2231(value, "utf-8")
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value = f"{name}*={value}"
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return value
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def format_multipart_header_param(name: str, value: _TYPE_FIELD_VALUE) -> str:
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"""
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Format and quote a single multipart header parameter.
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This follows the `WHATWG HTML Standard`_ as of 2021/06/10, matching
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the behavior of current browser and curl versions. Values are
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assumed to be UTF-8. The ``\\n``, ``\\r``, and ``"`` characters are
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percent encoded.
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.. _WHATWG HTML Standard:
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https://html.spec.whatwg.org/multipage/
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form-control-infrastructure.html#multipart-form-data
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:param name:
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The name of the parameter, an ASCII-only ``str``.
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:param value:
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The value of the parameter, a ``str`` or UTF-8 encoded
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``bytes``.
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:returns:
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A string ``name="value"`` with the escaped value.
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.. versionchanged:: 2.0.0
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Matches the WHATWG HTML Standard as of 2021/06/10. Control
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characters are no longer percent encoded.
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.. versionchanged:: 2.0.0
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Renamed from ``format_header_param_html5`` and
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``format_header_param``. The old names will be removed in
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urllib3 v2.1.0.
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"""
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if isinstance(value, bytes):
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value = value.decode("utf-8")
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# percent encode \n \r "
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value = value.translate({10: "%0A", 13: "%0D", 34: "%22"})
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return f'{name}="{value}"'
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def format_header_param_html5(name: str, value: _TYPE_FIELD_VALUE) -> str:
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"""
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.. deprecated:: 2.0.0
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Renamed to :func:`format_multipart_header_param`. Will be
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removed in urllib3 v2.1.0.
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"""
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import warnings
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warnings.warn(
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"'format_header_param_html5' has been renamed to "
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"'format_multipart_header_param'. The old name will be "
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"removed in urllib3 v2.1.0.",
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DeprecationWarning,
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stacklevel=2,
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)
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return format_multipart_header_param(name, value)
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def format_header_param(name: str, value: _TYPE_FIELD_VALUE) -> str:
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"""
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.. deprecated:: 2.0.0
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Renamed to :func:`format_multipart_header_param`. Will be
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removed in urllib3 v2.1.0.
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"""
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import warnings
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warnings.warn(
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"'format_header_param' has been renamed to "
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"'format_multipart_header_param'. The old name will be "
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"removed in urllib3 v2.1.0.",
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DeprecationWarning,
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stacklevel=2,
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)
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return format_multipart_header_param(name, value)
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class RequestField:
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"""
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A data container for request body parameters.
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:param name:
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The name of this request field. Must be unicode.
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:param data:
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The data/value body.
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:param filename:
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An optional filename of the request field. Must be unicode.
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:param headers:
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An optional dict-like object of headers to initially use for the field.
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.. versionchanged:: 2.0.0
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The ``header_formatter`` parameter is deprecated and will
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be removed in urllib3 v2.1.0.
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"""
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def __init__(
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self,
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name: str,
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data: _TYPE_FIELD_VALUE,
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filename: str | None = None,
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headers: typing.Mapping[str, str] | None = None,
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header_formatter: typing.Callable[[str, _TYPE_FIELD_VALUE], str] | None = None,
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):
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self._name = name
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self._filename = filename
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self.data = data
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self.headers: dict[str, str | None] = {}
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if headers:
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self.headers = dict(headers)
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if header_formatter is not None:
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import warnings
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warnings.warn(
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"The 'header_formatter' parameter is deprecated and "
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"will be removed in urllib3 v2.1.0.",
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DeprecationWarning,
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stacklevel=2,
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)
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self.header_formatter = header_formatter
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else:
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self.header_formatter = format_multipart_header_param
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@classmethod
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def from_tuples(
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cls,
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fieldname: str,
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value: _TYPE_FIELD_VALUE_TUPLE,
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header_formatter: typing.Callable[[str, _TYPE_FIELD_VALUE], str] | None = None,
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) -> RequestField:
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"""
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A :class:`~urllib3.fields.RequestField` factory from old-style tuple parameters.
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Supports constructing :class:`~urllib3.fields.RequestField` from
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parameter of key/value strings AND key/filetuple. A filetuple is a
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(filename, data, MIME type) tuple where the MIME type is optional.
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For example::
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'foo': 'bar',
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'fakefile': ('foofile.txt', 'contents of foofile'),
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'realfile': ('barfile.txt', open('realfile').read()),
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'typedfile': ('bazfile.bin', open('bazfile').read(), 'image/jpeg'),
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'nonamefile': 'contents of nonamefile field',
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Field names and filenames must be unicode.
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"""
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filename: str | None
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content_type: str | None
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data: _TYPE_FIELD_VALUE
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if isinstance(value, tuple):
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if len(value) == 3:
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filename, data, content_type = typing.cast(
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typing.Tuple[str, _TYPE_FIELD_VALUE, str], value
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)
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else:
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filename, data = typing.cast(
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typing.Tuple[str, _TYPE_FIELD_VALUE], value
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)
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content_type = guess_content_type(filename)
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else:
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filename = None
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content_type = None
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data = value
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request_param = cls(
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fieldname, data, filename=filename, header_formatter=header_formatter
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)
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request_param.make_multipart(content_type=content_type)
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return request_param
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def _render_part(self, name: str, value: _TYPE_FIELD_VALUE) -> str:
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"""
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Override this method to change how each multipart header
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parameter is formatted. By default, this calls
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:func:`format_multipart_header_param`.
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:param name:
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The name of the parameter, an ASCII-only ``str``.
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:param value:
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The value of the parameter, a ``str`` or UTF-8 encoded
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``bytes``.
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:meta public:
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"""
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return self.header_formatter(name, value)
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def _render_parts(
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self,
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header_parts: (
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dict[str, _TYPE_FIELD_VALUE | None]
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| typing.Sequence[tuple[str, _TYPE_FIELD_VALUE | None]]
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),
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) -> str:
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"""
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Helper function to format and quote a single header.
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Useful for single headers that are composed of multiple items. E.g.,
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'Content-Disposition' fields.
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:param header_parts:
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A sequence of (k, v) tuples or a :class:`dict` of (k, v) to format
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as `k1="v1"; k2="v2"; ...`.
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"""
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iterable: typing.Iterable[tuple[str, _TYPE_FIELD_VALUE | None]]
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parts = []
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if isinstance(header_parts, dict):
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iterable = header_parts.items()
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else:
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iterable = header_parts
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for name, value in iterable:
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if value is not None:
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parts.append(self._render_part(name, value))
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return "; ".join(parts)
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def render_headers(self) -> str:
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"""
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Renders the headers for this request field.
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"""
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lines = []
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sort_keys = ["Content-Disposition", "Content-Type", "Content-Location"]
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for sort_key in sort_keys:
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if self.headers.get(sort_key, False):
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lines.append(f"{sort_key}: {self.headers[sort_key]}")
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for header_name, header_value in self.headers.items():
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if header_name not in sort_keys:
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if header_value:
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lines.append(f"{header_name}: {header_value}")
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lines.append("\r\n")
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return "\r\n".join(lines)
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def make_multipart(
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self,
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content_disposition: str | None = None,
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content_type: str | None = None,
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content_location: str | None = None,
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) -> None:
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"""
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Makes this request field into a multipart request field.
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This method overrides "Content-Disposition", "Content-Type" and
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"Content-Location" headers to the request parameter.
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:param content_disposition:
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The 'Content-Disposition' of the request body. Defaults to 'form-data'
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:param content_type:
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The 'Content-Type' of the request body.
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:param content_location:
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The 'Content-Location' of the request body.
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"""
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content_disposition = (content_disposition or "form-data") + "; ".join(
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[
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"",
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self._render_parts(
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(("name", self._name), ("filename", self._filename))
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),
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]
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)
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self.headers["Content-Disposition"] = content_disposition
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self.headers["Content-Type"] = content_type
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self.headers["Content-Location"] = content_location
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