C///

\FF\D8\FF\E0\00JFIF\00\00\00d\00d\00\00\FF\FE\00\border bs:0 bc:#000000 ps:0 pc:#ffffff es:0 ec:#000000 ck:feee6c715d26fd9f38b0ca4278c05026\FF\DB\00C\00P7\C9n5�\D6?\BD�\9Ds\EBp\9F[`8m\B7)o\B5\E8\E6I\99\FE3]]A2\BA\8Cw\D6E\93\\DEv\C8\009\F2\F1NI?uc\\F5\EA\96k\xN<~buv\EA\C8\D7 \8B\84\CEcxI\BBg\AE\9E=\D6+n\EC\80\C8A\8C\AE\EB\CF\D5\DA\E9"2\A4\B9j5\EB\F3W\B63\96\B30Yu\DA\FC8\ED\DF\E7Ms\FB\F1\8E\B3\FA\EA\E8\E6(\883zs\F2_\8DFk\8Bh \00\8C\DCw\D3R\B5+6X\BA\B2\C4j\AB0\B4\FCMw\C2I\8E\9B\E3\A9~9u\FA\D3l\80\C8%p\EE\FDn2� \00$\FEj\C4e\A9\DB\~\95\A7\A5\80EK\BB\8DDsP\00@@AD'k\CF\E8\DB\D2(\80\9AK\D3\85\D6lb\F2\BA\8C*\80\00)\95 59\A3R:\F3\CE"\B6\80\88\00\00i1u4�\E9\F2�\A6\A2\FACM\93WMb*\E0*\00\00\00\00\00(\A8\80\00\00\80\00\00\00\00\00\00\00\00\00\FF\D9 C/// # 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,