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from typing import Dict, Generator
from pip._vendor.requests.models import Response
from pip._internal.exceptions import NetworkConnectionError
# The following comments and HTTP headers were originally added by
# Donald Stufft in git commit 22c562429a61bb77172039e480873fb239dd8c03.
#
# We use Accept-Encoding: identity here because requests defaults to
# accepting compressed responses. This breaks in a variety of ways
# depending on how the server is configured.
# - Some servers will notice that the file isn't a compressible file
# and will leave the file alone and with an empty Content-Encoding
# - Some servers will notice that the file is already compressed and
# will leave the file alone, adding a Content-Encoding: gzip header
# - Some servers won't notice anything at all and will take a file
# that's already been compressed and compress it again, and set
# the Content-Encoding: gzip header
# By setting this to request only the identity encoding we're hoping
# to eliminate the third case. Hopefully there does not exist a server
# which when given a file will notice it is already compressed and that
# you're not asking for a compressed file and will then decompress it
# before sending because if that's the case I don't think it'll ever be
# possible to make this work.
HEADERS: Dict[str, str] = {"Accept-Encoding": "identity"}
DOWNLOAD_CHUNK_SIZE = 256 * 1024
def raise_for_status(resp: Response) -> None:
http_error_msg = ""
if isinstance(resp.reason, bytes):
# We attempt to decode utf-8 first because some servers
# choose to localize their reason strings. If the string
# isn't utf-8, we fall back to iso-8859-1 for all other
# encodings.
try:
reason = resp.reason.decode("utf-8")
except UnicodeDecodeError:
reason = resp.reason.decode("iso-8859-1")
else:
reason = resp.reason
if 400 <= resp.status_code < 500:
http_error_msg = (
f"{resp.status_code} Client Error: {reason} for url: {resp.url}"
)
elif 500 <= resp.status_code < 600:
http_error_msg = (
f"{resp.status_code} Server Error: {reason} for url: {resp.url}"
)
if http_error_msg:
raise NetworkConnectionError(http_error_msg, response=resp)
def response_chunks(
response: Response, chunk_size: int = DOWNLOAD_CHUNK_SIZE
) -> Generator[bytes, None, None]:
"""Given a requests Response, provide the data chunks."""
try:
# Special case for urllib3.
for chunk in response.raw.stream(
chunk_size,
# We use decode_content=False here because we don't
# want urllib3 to mess with the raw bytes we get
# from the server. If we decompress inside of
# urllib3 then we cannot verify the checksum
# because the checksum will be of the compressed
# file. This breakage will only occur if the
# server adds a Content-Encoding header, which
# depends on how the server was configured:
# - Some servers will notice that the file isn't a
# compressible file and will leave the file alone
# and with an empty Content-Encoding
# - Some servers will notice that the file is
# already compressed and will leave the file
# alone and will add a Content-Encoding: gzip
# header
# - Some servers won't notice anything at all and
# will take a file that's already been compressed
# and compress it again and set the
# Content-Encoding: gzip header
#
# By setting this not to decode automatically we
# hope to eliminate problems with the second case.
decode_content=False,
):
yield chunk
except AttributeError:
# Standard file-like object.
while True:
chunk = response.raw.read(chunk_size)
if not chunk:
break
yield chunk
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