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97 lines
4.0 KiB
Python
97 lines
4.0 KiB
Python
2 years ago
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from typing import Dict, Iterator
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from pip._vendor.requests.models import CONTENT_CHUNK_SIZE, Response
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from pip._internal.exceptions import NetworkConnectionError
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# The following comments and HTTP headers were originally added by
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# Donald Stufft in git commit 22c562429a61bb77172039e480873fb239dd8c03.
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#
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# We use Accept-Encoding: identity here because requests defaults to
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# accepting compressed responses. This breaks in a variety of ways
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# depending on how the server is configured.
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# - Some servers will notice that the file isn't a compressible file
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# and will leave the file alone and with an empty Content-Encoding
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# - Some servers will notice that the file is already compressed and
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# will leave the file alone, adding a Content-Encoding: gzip header
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# - Some servers won't notice anything at all and will take a file
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# that's already been compressed and compress it again, and set
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# the Content-Encoding: gzip header
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# By setting this to request only the identity encoding we're hoping
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# to eliminate the third case. Hopefully there does not exist a server
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# which when given a file will notice it is already compressed and that
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# you're not asking for a compressed file and will then decompress it
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# before sending because if that's the case I don't think it'll ever be
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# possible to make this work.
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HEADERS: Dict[str, str] = {"Accept-Encoding": "identity"}
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def raise_for_status(resp: Response) -> None:
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http_error_msg = ""
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if isinstance(resp.reason, bytes):
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# We attempt to decode utf-8 first because some servers
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# choose to localize their reason strings. If the string
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# isn't utf-8, we fall back to iso-8859-1 for all other
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# encodings.
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try:
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reason = resp.reason.decode("utf-8")
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except UnicodeDecodeError:
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reason = resp.reason.decode("iso-8859-1")
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else:
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reason = resp.reason
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if 400 <= resp.status_code < 500:
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http_error_msg = (
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f"{resp.status_code} Client Error: {reason} for url: {resp.url}"
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)
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elif 500 <= resp.status_code < 600:
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http_error_msg = (
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f"{resp.status_code} Server Error: {reason} for url: {resp.url}"
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)
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if http_error_msg:
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raise NetworkConnectionError(http_error_msg, response=resp)
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def response_chunks(
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response: Response, chunk_size: int = CONTENT_CHUNK_SIZE
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) -> Iterator[bytes]:
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"""Given a requests Response, provide the data chunks."""
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try:
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# Special case for urllib3.
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for chunk in response.raw.stream(
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chunk_size,
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# We use decode_content=False here because we don't
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# want urllib3 to mess with the raw bytes we get
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# from the server. If we decompress inside of
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# urllib3 then we cannot verify the checksum
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# because the checksum will be of the compressed
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# file. This breakage will only occur if the
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# server adds a Content-Encoding header, which
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# depends on how the server was configured:
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# - Some servers will notice that the file isn't a
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# compressible file and will leave the file alone
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# and with an empty Content-Encoding
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# - Some servers will notice that the file is
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# already compressed and will leave the file
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# alone and will add a Content-Encoding: gzip
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# header
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# - Some servers won't notice anything at all and
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# will take a file that's already been compressed
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# and compress it again and set the
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# Content-Encoding: gzip header
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#
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# By setting this not to decode automatically we
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# hope to eliminate problems with the second case.
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decode_content=False,
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):
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yield chunk
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except AttributeError:
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# Standard file-like object.
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while True:
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chunk = response.raw.read(chunk_size)
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if not chunk:
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break
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yield chunk
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