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File Name : heuristics.py

# 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

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2026-03-03 09:04:35
..	dir	-	root/root	0755	2026-03-03 09:06:27
__pycache__	dir	-	root/root	0755	2026-03-03 09:04:35
caches	dir	-	root/root	0755	2026-03-03 09:04:35
LICENSE.txt	text/plain	558 B	root/root	0644	2026-02-13 12:40:39
__init__.py	text/x-script.python	820 B	root/root	0644	2026-02-13 12:40:39
_cmd.py	text/x-script.python	1.7 KB	root/root	0644	2026-02-13 12:40:39
adapter.py	text/x-script.python	6.43 KB	root/root	0644	2026-02-13 12:40:39
cache.py	text/x-script.python	1.91 KB	root/root	0644	2026-02-13 12:40:39
controller.py	text/x-script.python	18.65 KB	root/root	0644	2026-02-13 12:40:39
filewrapper.py	text/x-script.python	4.25 KB	root/root	0644	2026-02-13 12:40:39
heuristics.py	text/x-script.python	4.77 KB	root/root	0644	2026-02-13 12:40:39
py.typed	application/x-empty	0 B	root/root	0644	2026-02-13 12:40:39
serialize.py	text/x-script.python	5.04 KB	root/root	0644	2026-02-13 12:40:39
wrapper.py	text/x-script.python	1.38 KB	root/root	0644	2026-02-13 12:40:39

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