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✍️ Editing: utils.py

            File: /opt/alt/python37/lib/python3.7/site-packages/pip/_internal/network/utils.py

            Size: 4.07 KB | 
            Last Modified: 2023-11-14 04:31:06        

from pip._vendor.requests.models import CONTENT_CHUNK_SIZE, Response

from pip._internal.exceptions import NetworkConnectionError
from pip._internal.utils.typing import MYPY_CHECK_RUNNING

if MYPY_CHECK_RUNNING:
    from typing import Dict, Iterator

# 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 = {'Accept-Encoding': 'identity'}  # type: Dict[str, str]

def raise_for_status(resp):
    # type: (Response) -> None
    http_error_msg = u''
    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 = u'%s Client Error: %s for url: %s' % (
            resp.status_code, reason, resp.url)

elif 500 <= resp.status_code < 600:
        http_error_msg = u'%s Server Error: %s for url: %s' % (
            resp.status_code, reason, resp.url)

if http_error_msg:
        raise NetworkConnectionError(http_error_msg, response=resp)

def response_chunks(response, chunk_size=CONTENT_CHUNK_SIZE):
    # type: (Response, int) -> Iterator[bytes]
    """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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