90 lines
3.8 KiB
Python
90 lines
3.8 KiB
Python
"""Dynamically set SameSite depending if the upstream connection is TLS or not"""
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import time
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from django.conf import settings
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from django.contrib.sessions.backends.base import UpdateError
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from django.contrib.sessions.exceptions import SessionInterrupted
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from django.contrib.sessions.middleware import (
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SessionMiddleware as UpstreamSessionMiddleware,
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)
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from django.http.request import HttpRequest
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from django.http.response import HttpResponse
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from django.utils.cache import patch_vary_headers
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from django.utils.http import http_date
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class SessionMiddleware(UpstreamSessionMiddleware):
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"""Dynamically set SameSite depending if the upstream connection is TLS or not"""
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@staticmethod
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def is_secure(request: HttpRequest) -> bool:
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"""Check if request is TLS'd or localhost"""
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if request.is_secure():
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return True
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host, _, _ = request.get_host().partition(":")
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if host == "localhost" and settings.DEBUG:
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return True
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return False
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def process_response(
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self, request: HttpRequest, response: HttpResponse
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) -> HttpResponse:
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"""
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If request.session was modified, or if the configuration is to save the
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session every time, save the changes and set a session cookie or delete
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the session cookie if the session has been emptied.
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"""
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try:
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accessed = request.session.accessed
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modified = request.session.modified
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empty = request.session.is_empty()
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except AttributeError:
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return response
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# Set SameSite based on whether or not the request is secure
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secure = SessionMiddleware.is_secure(request)
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same_site = "None" if secure else "Lax"
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# First check if we need to delete this cookie.
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# The session should be deleted only if the session is entirely empty.
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if settings.SESSION_COOKIE_NAME in request.COOKIES and empty:
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response.delete_cookie(
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settings.SESSION_COOKIE_NAME,
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path=settings.SESSION_COOKIE_PATH,
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domain=settings.SESSION_COOKIE_DOMAIN,
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samesite=same_site,
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)
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patch_vary_headers(response, ("Cookie",))
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else:
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if accessed:
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patch_vary_headers(response, ("Cookie",))
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if (modified or settings.SESSION_SAVE_EVERY_REQUEST) and not empty:
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if request.session.get_expire_at_browser_close():
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max_age = None
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expires = None
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else:
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max_age = request.session.get_expiry_age()
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expires_time = time.time() + max_age
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expires = http_date(expires_time)
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# Save the session data and refresh the client cookie.
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# Skip session save for 500 responses, refs #3881.
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if response.status_code != 500:
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try:
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request.session.save()
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except UpdateError:
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raise SessionInterrupted(
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"The request's session was deleted before the "
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"request completed. The user may have logged "
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"out in a concurrent request, for example."
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)
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response.set_cookie(
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settings.SESSION_COOKIE_NAME,
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request.session.session_key,
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max_age=max_age,
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expires=expires,
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domain=settings.SESSION_COOKIE_DOMAIN,
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path=settings.SESSION_COOKIE_PATH,
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secure=secure,
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httponly=settings.SESSION_COOKIE_HTTPONLY or None,
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samesite=same_site,
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)
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return response
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