Загрузить файлы в «venv/Lib/site-packages/pip/_vendor/cachecontrol»

venv/Lib/site-packages/pip/_vendor/cachecontrol/LICENSE.txt

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+Copyright 2012-2021  Eric Larson
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

venv/Lib/site-packages/pip/_vendor/cachecontrol/filewrapper.py

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+# SPDX-FileCopyrightText: 2015 Eric Larson
+#
+# SPDX-License-Identifier: Apache-2.0
+from __future__ import annotations
+
+import mmap
+from tempfile import NamedTemporaryFile
+from typing import TYPE_CHECKING, Any, Callable
+
+if TYPE_CHECKING:
+    from collections.abc import Buffer
+    from http.client import HTTPResponse
+
+
+class CallbackFileWrapper:
+    """
+    Small wrapper around a fp object which will tee everything read into a
+    buffer, and when that file is closed it will execute a callback with the
+    contents of that buffer.
+
+    All attributes are proxied to the underlying file object.
+
+    This class uses members with a double underscore (__) leading prefix so as
+    not to accidentally shadow an attribute.
+
+    The data is stored in a temporary file until it is all available.  As long
+    as the temporary files directory is disk-based (sometimes it's a
+    memory-backed-``tmpfs`` on Linux), data will be unloaded to disk if memory
+    pressure is high.  For small files the disk usually won't be used at all,
+    it'll all be in the filesystem memory cache, so there should be no
+    performance impact.
+    """
+
+    def __init__(
+        self, fp: HTTPResponse, callback: Callable[[Buffer], None] | None
+    ) -> None:
+        self.__buf = NamedTemporaryFile("rb+", delete=True)
+        self.__fp = fp
+        self.__callback = callback
+
+    def __getattr__(self, name: str) -> Any:
+        # The vagaries of garbage collection means that self.__fp is
+        # not always set.  By using __getattribute__ and the private
+        # name[0] allows looking up the attribute value and raising an
+        # AttributeError when it doesn't exist. This stop things from
+        # infinitely recursing calls to getattr in the case where
+        # self.__fp hasn't been set.
+        #
+        # [0] https://docs.python.org/2/reference/expressions.html#atom-identifiers
+        fp = self.__getattribute__("_CallbackFileWrapper__fp")
+        return getattr(fp, name)
+
+    def __is_fp_closed(self) -> bool:
+        try:
+            return self.__fp.fp is None
+
+        except AttributeError:
+            pass
+
+        try:
+            closed: bool = self.__fp.closed
+            return closed
+
+        except AttributeError:
+            pass
+
+        # We just don't cache it then.
+        # TODO: Add some logging here...
+        return False
+
+    def _close(self) -> None:
+        result: Buffer
+        if self.__callback:
+            if self.__buf.tell() == 0:
+                # Empty file:
+                result = b""
+            else:
+                # Return the data without actually loading it into memory,
+                # relying on Python's buffer API and mmap(). mmap() just gives
+                # a view directly into the filesystem's memory cache, so it
+                # doesn't result in duplicate memory use.
+                self.__buf.seek(0, 0)
+                result = memoryview(
+                    mmap.mmap(self.__buf.fileno(), 0, access=mmap.ACCESS_READ)
+                )
+            self.__callback(result)
+
+        # We assign this to None here, because otherwise we can get into
+        # really tricky problems where the CPython interpreter dead locks
+        # because the callback is holding a reference to something which
+        # has a __del__ method. Setting this to None breaks the cycle
+        # and allows the garbage collector to do it's thing normally.
+        self.__callback = None
+
+        # Closing the temporary file releases memory and frees disk space.
+        # Important when caching big files.
+        self.__buf.close()
+
+    def read(self, amt: int | None = None) -> bytes:
+        data: bytes = self.__fp.read(amt)
+        if data:
+            # We may be dealing with b'', a sign that things are over:
+            # it's passed e.g. after we've already closed self.__buf.
+            self.__buf.write(data)
+        if self.__is_fp_closed():
+            self._close()
+
+        return data
+
+    def _safe_read(self, amt: int) -> bytes:
+        data: bytes = self.__fp._safe_read(amt)  # type: ignore[attr-defined]
+        if amt == 2 and data == b"\r\n":
+            # urllib executes this read to toss the CRLF at the end
+            # of the chunk.
+            return data
+
+        self.__buf.write(data)
+        if self.__is_fp_closed():
+            self._close()
+
+        return data

venv/Lib/site-packages/pip/_vendor/cachecontrol/heuristics.py

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+# SPDX-FileCopyrightText: 2015 Eric Larson
+#
+# SPDX-License-Identifier: Apache-2.0
+from __future__ import annotations
+
+import calendar
+import time
+from datetime import datetime, timedelta, timezone
+from email.utils import formatdate, parsedate, parsedate_tz
+from typing import TYPE_CHECKING, Any, Mapping
+
+if TYPE_CHECKING:
+    from pip._vendor.urllib3 import HTTPResponse
+
+TIME_FMT = "%a, %d %b %Y %H:%M:%S GMT"
+
+
+def expire_after(delta: timedelta, date: datetime | None = None) -> datetime:
+    date = date or datetime.now(timezone.utc)
+    return date + delta
+
+
+def datetime_to_header(dt: datetime) -> str:
+    return formatdate(calendar.timegm(dt.timetuple()))
+
+
+class BaseHeuristic:
+    def warning(self, response: HTTPResponse) -> str | None:
+        """
+        Return a valid 1xx warning header value describing the cache
+        adjustments.
+
+        The response is provided too allow warnings like 113
+        http://tools.ietf.org/html/rfc7234#section-5.5.4 where we need
+        to explicitly say response is over 24 hours old.
+        """
+        return '110 - "Response is Stale"'
+
+    def update_headers(self, response: HTTPResponse) -> dict[str, str]:
+        """Update the response headers with any new headers.
+
+        NOTE: This SHOULD always include some Warning header to
+              signify that the response was cached by the client, not
+              by way of the provided headers.
+        """
+        return {}
+
+    def apply(self, response: HTTPResponse) -> HTTPResponse:
+        updated_headers = self.update_headers(response)
+
+        if updated_headers:
+            response.headers.update(updated_headers)
+            warning_header_value = self.warning(response)
+            if warning_header_value is not None:
+                response.headers.update({"Warning": warning_header_value})
+
+        return response
+
+
+class OneDayCache(BaseHeuristic):
+    """
+    Cache the response by providing an expires 1 day in the
+    future.
+    """
+
+    def update_headers(self, response: HTTPResponse) -> dict[str, str]:
+        headers = {}
+
+        if "expires" not in response.headers:
+            date = parsedate(response.headers["date"])
+            expires = expire_after(
+                timedelta(days=1),
+                date=datetime(*date[:6], tzinfo=timezone.utc),  # type: ignore[index,misc]
+            )
+            headers["expires"] = datetime_to_header(expires)
+            headers["cache-control"] = "public"
+        return headers
+
+
+class ExpiresAfter(BaseHeuristic):
+    """
+    Cache **all** requests for a defined time period.
+    """
+
+    def __init__(self, **kw: Any) -> None:
+        self.delta = timedelta(**kw)
+
+    def update_headers(self, response: HTTPResponse) -> dict[str, str]:
+        expires = expire_after(self.delta)
+        return {"expires": datetime_to_header(expires), "cache-control": "public"}
+
+    def warning(self, response: HTTPResponse) -> str | None:
+        tmpl = "110 - Automatically cached for %s. Response might be stale"
+        return tmpl % self.delta
+
+
+class LastModified(BaseHeuristic):
+    """
+    If there is no Expires header already, fall back on Last-Modified
+    using the heuristic from
+    http://tools.ietf.org/html/rfc7234#section-4.2.2
+    to calculate a reasonable value.
+
+    Firefox also does something like this per
+    https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching_FAQ
+    http://lxr.mozilla.org/mozilla-release/source/netwerk/protocol/http/nsHttpResponseHead.cpp#397
+    Unlike mozilla we limit this to 24-hr.
+    """
+
+    cacheable_by_default_statuses = {
+        200,
+        203,
+        204,
+        206,
+        300,
+        301,
+        404,
+        405,
+        410,
+        414,
+        501,
+    }
+
+    def update_headers(self, resp: HTTPResponse) -> dict[str, str]:
+        headers: Mapping[str, str] = resp.headers
+
+        if "expires" in headers:
+            return {}
+
+        if "cache-control" in headers and headers["cache-control"] != "public":
+            return {}
+
+        if resp.status not in self.cacheable_by_default_statuses:
+            return {}
+
+        if "date" not in headers or "last-modified" not in headers:
+            return {}
+
+        time_tuple = parsedate_tz(headers["date"])
+        assert time_tuple is not None
+        date = calendar.timegm(time_tuple[:6])
+        last_modified = parsedate(headers["last-modified"])
+        if last_modified is None:
+            return {}
+
+        now = time.time()
+        current_age = max(0, now - date)
+        delta = date - calendar.timegm(last_modified)
+        freshness_lifetime = max(0, min(delta / 10, 24 * 3600))
+        if freshness_lifetime <= current_age:
+            return {}
+
+        expires = date + freshness_lifetime
+        return {"expires": time.strftime(TIME_FMT, time.gmtime(expires))}
+
+    def warning(self, resp: HTTPResponse) -> str | None:
+        return None

venv/Lib/site-packages/pip/_vendor/cachecontrol/serialize.py

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+# SPDX-FileCopyrightText: 2015 Eric Larson
+#
+# SPDX-License-Identifier: Apache-2.0
+from __future__ import annotations
+
+import io
+from typing import IO, TYPE_CHECKING, Any, Mapping, cast
+
+from pip._vendor import msgpack
+from pip._vendor.requests.structures import CaseInsensitiveDict
+from pip._vendor.urllib3 import HTTPResponse
+
+if TYPE_CHECKING:
+    from pip._vendor.requests import PreparedRequest
+
+
+class Serializer:
+    serde_version = "4"
+
+    def dumps(
+        self,
+        request: PreparedRequest,
+        response: HTTPResponse,
+        body: bytes | None = None,
+    ) -> bytes:
+        response_headers: CaseInsensitiveDict[str] = CaseInsensitiveDict(
+            response.headers
+        )
+
+        if body is None:
+            # When a body isn't passed in, we'll read the response. We
+            # also update the response with a new file handler to be
+            # sure it acts as though it was never read.
+            body = response.read(decode_content=False)
+            response._fp = io.BytesIO(body)  # type: ignore[assignment]
+            response.length_remaining = len(body)
+
+        data = {
+            "response": {
+                "body": body,  # Empty bytestring if body is stored separately
+                "headers": {str(k): str(v) for k, v in response.headers.items()},
+                "status": response.status,
+                "version": response.version,
+                "reason": str(response.reason),
+                "decode_content": response.decode_content,
+            }
+        }
+
+        # Construct our vary headers
+        data["vary"] = {}
+        if "vary" in response_headers:
+            varied_headers = response_headers["vary"].split(",")
+            for header in varied_headers:
+                header = str(header).strip()
+                header_value = request.headers.get(header, None)
+                if header_value is not None:
+                    header_value = str(header_value)
+                data["vary"][header] = header_value
+
+        return b",".join([f"cc={self.serde_version}".encode(), self.serialize(data)])
+
+    def serialize(self, data: dict[str, Any]) -> bytes:
+        return cast(bytes, msgpack.dumps(data, use_bin_type=True))
+
+    def loads(
+        self,
+        request: PreparedRequest,
+        data: bytes,
+        body_file: IO[bytes] | None = None,
+    ) -> HTTPResponse | None:
+        # Short circuit if we've been given an empty set of data
+        if not data:
+            return None
+
+        # Previous versions of this library supported other serialization
+        # formats, but these have all been removed.
+        if not data.startswith(f"cc={self.serde_version},".encode()):
+            return None
+
+        data = data[5:]
+        return self._loads_v4(request, data, body_file)
+
+    def prepare_response(
+        self,
+        request: PreparedRequest,
+        cached: Mapping[str, Any],
+        body_file: IO[bytes] | None = None,
+    ) -> HTTPResponse | None:
+        """Verify our vary headers match and construct a real urllib3
+        HTTPResponse object.
+        """
+        # Special case the '*' Vary value as it means we cannot actually
+        # determine if the cached response is suitable for this request.
+        # This case is also handled in the controller code when creating
+        # a cache entry, but is left here for backwards compatibility.
+        if "*" in cached.get("vary", {}):
+            return None
+
+        # Ensure that the Vary headers for the cached response match our
+        # request
+        for header, value in cached.get("vary", {}).items():
+            if request.headers.get(header, None) != value:
+                return None
+
+        body_raw = cached["response"].pop("body")
+
+        headers: CaseInsensitiveDict[str] = CaseInsensitiveDict(
+            data=cached["response"]["headers"]
+        )
+        if headers.get("transfer-encoding", "") == "chunked":
+            headers.pop("transfer-encoding")
+
+        cached["response"]["headers"] = headers
+
+        try:
+            body: IO[bytes]
+            if body_file is None:
+                body = io.BytesIO(body_raw)
+            else:
+                body = body_file
+        except TypeError:
+            # This can happen if cachecontrol serialized to v1 format (pickle)
+            # using Python 2. A Python 2 str(byte string) will be unpickled as
+            # a Python 3 str (unicode string), which will cause the above to
+            # fail with:
+            #
+            #     TypeError: 'str' does not support the buffer interface
+            body = io.BytesIO(body_raw.encode("utf8"))
+
+        # Discard any `strict` parameter serialized by older version of cachecontrol.
+        cached["response"].pop("strict", None)
+
+        return HTTPResponse(body=body, preload_content=False, **cached["response"])
+
+    def _loads_v4(
+        self,
+        request: PreparedRequest,
+        data: bytes,
+        body_file: IO[bytes] | None = None,
+    ) -> HTTPResponse | None:
+        try:
+            cached = msgpack.loads(data, raw=False)
+        except ValueError:
+            return None
+
+        return self.prepare_response(request, cached, body_file)