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102 lines
3.3 KiB
102 lines
3.3 KiB
1 year ago
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from __future__ import annotations
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import http.client as httplib
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from email.errors import MultipartInvariantViolationDefect, StartBoundaryNotFoundDefect
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from ..exceptions import HeaderParsingError
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def is_fp_closed(obj: object) -> bool:
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"""
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Checks whether a given file-like object is closed.
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:param obj:
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The file-like object to check.
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"""
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try:
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# Check `isclosed()` first, in case Python3 doesn't set `closed`.
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# GH Issue #928
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return obj.isclosed() # type: ignore[no-any-return, attr-defined]
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except AttributeError:
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pass
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try:
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# Check via the official file-like-object way.
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return obj.closed # type: ignore[no-any-return, attr-defined]
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except AttributeError:
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pass
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try:
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# Check if the object is a container for another file-like object that
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# gets released on exhaustion (e.g. HTTPResponse).
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return obj.fp is None # type: ignore[attr-defined]
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except AttributeError:
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pass
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raise ValueError("Unable to determine whether fp is closed.")
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def assert_header_parsing(headers: httplib.HTTPMessage) -> None:
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"""
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Asserts whether all headers have been successfully parsed.
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Extracts encountered errors from the result of parsing headers.
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Only works on Python 3.
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:param http.client.HTTPMessage headers: Headers to verify.
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:raises urllib3.exceptions.HeaderParsingError:
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If parsing errors are found.
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"""
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# This will fail silently if we pass in the wrong kind of parameter.
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# To make debugging easier add an explicit check.
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if not isinstance(headers, httplib.HTTPMessage):
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raise TypeError(f"expected httplib.Message, got {type(headers)}.")
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unparsed_data = None
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# get_payload is actually email.message.Message.get_payload;
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# we're only interested in the result if it's not a multipart message
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if not headers.is_multipart():
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payload = headers.get_payload()
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if isinstance(payload, (bytes, str)):
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unparsed_data = payload
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# httplib is assuming a response body is available
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# when parsing headers even when httplib only sends
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# header data to parse_headers() This results in
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# defects on multipart responses in particular.
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# See: https://github.com/urllib3/urllib3/issues/800
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# So we ignore the following defects:
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# - StartBoundaryNotFoundDefect:
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# The claimed start boundary was never found.
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# - MultipartInvariantViolationDefect:
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# A message claimed to be a multipart but no subparts were found.
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defects = [
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defect
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for defect in headers.defects
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if not isinstance(
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defect, (StartBoundaryNotFoundDefect, MultipartInvariantViolationDefect)
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)
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]
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if defects or unparsed_data:
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raise HeaderParsingError(defects=defects, unparsed_data=unparsed_data)
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def is_response_to_head(response: httplib.HTTPResponse) -> bool:
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"""
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Checks whether the request of a response has been a HEAD-request.
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:param http.client.HTTPResponse response:
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Response to check if the originating request
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used 'HEAD' as a method.
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"""
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# FIXME: Can we do this somehow without accessing private httplib _method?
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method_str = response._method # type: str # type: ignore[attr-defined]
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return method_str.upper() == "HEAD"
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