基于view kwargs编写Django Session中间件
Writing Django Session Middleware based on view kwargs
我需要能够在我点击特定的 URLS 时不在我的 Django 应用程序中设置会话，因为 URLs 决定去哪个数据库和会话 django 使用存储在那些数据库中
那么，请问我如何编写 SessionMiddleware 以使用 process_view 而不是 process_response()？
import time
from importlib import import_module
from django.conf import settings
from django.contrib.sessions.backends.base import UpdateError
from django.contrib.sessions.exceptions import SessionInterrupted
from django.utils.cache import patch_vary_headers
from django.utils.deprecation import MiddlewareMixin
from django.utils.functional import SimpleLazyObject
from django.utils.http import http_date
class SessionMiddleware(MiddlewareMixin):
pass
# RemovedInDjango40Warning: when the deprecation ends, replace with:
# def __init__(self, get_response):
def __init__(self, get_response=None):
super().__init__(get_response)
engine = import_module(settings.SESSION_ENGINE)
self.SessionStore = engine.SessionStore
def process_request(self, request):
session_key = request.COOKIES.get(settings.SESSION_COOKIE_NAME)
print(request.__dict__)
if hasattr(request, 'client_url'):
print('client url')
request.session = self.SessionStore(session_key)
print(self.SessionStore(session_key), self.SessionStore(session_key).__dict__)
else:
from django.contrib.sessions.backends.db import SessionStore
s = SessionStore(session_key)
print('session eluded...')
request.session = s
print('session eluded after...')
request.session = {}
def process_view(self, request, callback, callback_args, callback_kwargs):
# I NEED TO CALL THIS TO ENSURE SESSIONS ARE IN A SPECIFIC DB
pass
def process_response(self, request, response):
"""
If request.session was modified, or if the configuration is to save the
session every time, save the changes and set a session cookie or delete
the session cookie if the session has been emptied.
"""
try:
accessed = request.session.accessed
modified = request.session.modified
empty = request.session.is_empty()
except AttributeError:
return response
# First check if we need to delete this cookie.
# The session should be deleted only if the session is entirely empty.
if settings.SESSION_COOKIE_NAME in request.COOKIES and empty:
response.delete_cookie(
settings.SESSION_COOKIE_NAME,
path=settings.SESSION_COOKIE_PATH,
domain=settings.SESSION_COOKIE_DOMAIN,
samesite=settings.SESSION_COOKIE_SAMESITE,
)
patch_vary_headers(response, ('Cookie',))
else:
if accessed:
patch_vary_headers(response, ('Cookie',))
if (modified or settings.SESSION_SAVE_EVERY_REQUEST) and not empty:
if request.session.get_expire_at_browser_close():
max_age = None
expires = None
else:
max_age = request.session.get_expiry_age()
expires_time = time.time() + max_age
expires = http_date(expires_time)
# Save the session data and refresh the client cookie.
# Skip session save for 500 responses, refs #3881.
if response.status_code != 500:
try:
request.session.save()
except UpdateError:
raise SessionInterrupted(
"The request's session was deleted before the "
"request completed. The user may have logged "
"out in a concurrent request, for example."
)
response.set_cookie(
settings.SESSION_COOKIE_NAME,
request.session.session_key, max_age=max_age,
expires=expires, domain=settings.SESSION_COOKIE_DOMAIN,
path=settings.SESSION_COOKIE_PATH,
secure=settings.SESSION_COOKIE_SECURE or None,
httponly=settings.SESSION_COOKIE_HTTPONLY or None,
samesite=settings.SESSION_COOKIE_SAMESITE,
)
return response
from django.contrib import auth
def get_user(request):
if not hasattr(request, '_cached_user'):
request._cached_user = auth.get_user(request)
return request._cached_user
class AuthenticationMiddleware(MiddlewareMixin):
def process_request(self, request):
assert hasattr(request, 'session'), (
"The Django authentication middleware requires session middleware "
"to be installed. Edit your MIDDLEWARE setting to insert "
"'django.contrib.sessions.middleware.SessionMiddleware' before "
"'django.contrib.auth.middleware.AuthenticationMiddleware'."
)
request.user = SimpleLazyObject(lambda: get_user(request))
我试过的所有方法都不起作用。我需要会话不保存，除非有 URL kwarg，客户端 URL。我该怎么做？
解决方案是更改 process_request() 以检查 client_url 是否位于已解析的 request.path_info 变量中，如下所示：
import time
from importlib import import_module
from django.conf import settings
from django.contrib.sessions.backends.base import UpdateError
from django.contrib.sessions.exceptions import SessionInterrupted
from django.urls import resolve
from django.utils.cache import patch_vary_headers
from django.utils.deprecation import MiddlewareMixin
from django.utils.functional import SimpleLazyObject
from django.utils.http import http_date
class SessionMiddleware(MiddlewareMixin):
pass
# RemovedInDjango40Warning: when the deprecation ends, replace with:
# def __init__(self, get_response):
def __init__(self, get_response=None):
super().__init__(get_response)
engine = import_module(settings.SESSION_ENGINE)
self.SessionStore = engine.SessionStore
def process_request(self, request): # HERE!!!!!
session_key = request.COOKIES.get(settings.SESSION_COOKIE_NAME)
# print(request.path, resolve(request.path_info).kwargs)
if 'client_url' in resolve(request.path_info).kwargs:
print('client url found')
request.session = self.SessionStore(session_key)
# print(self.SessionStore(session_key), self.SessionStore(session_key).__dict__)
else:
# this is an error because the db cannot be found without client_url,
# but we need to assign session or auth does not work
print('session eluded...')
request.session = {}
def process_view(self, request, callback, callback_args, callback_kwargs):
# I NEED TO CALL THIS TO ENSURE SESSIONS ARE IN A SPECIFIC DB
pass
def process_response(self, request, response):
"""
If request.session was modified, or if the configuration is to save the
session every time, save the changes and set a session cookie or delete
the session cookie if the session has been emptied.
"""
try:
accessed = request.session.accessed
modified = request.session.modified
empty = request.session.is_empty()
except AttributeError:
return response
# First check if we need to delete this cookie.
# The session should be deleted only if the session is entirely empty.
if settings.SESSION_COOKIE_NAME in request.COOKIES and empty:
response.delete_cookie(
settings.SESSION_COOKIE_NAME,
path=settings.SESSION_COOKIE_PATH,
domain=settings.SESSION_COOKIE_DOMAIN,
samesite=settings.SESSION_COOKIE_SAMESITE,
)
patch_vary_headers(response, ('Cookie',))
else:
if accessed:
patch_vary_headers(response, ('Cookie',))
if (modified or settings.SESSION_SAVE_EVERY_REQUEST) and not empty:
if request.session.get_expire_at_browser_close():
max_age = None
expires = None
else:
max_age = request.session.get_expiry_age()
expires_time = time.time() + max_age
expires = http_date(expires_time)
# Save the session data and refresh the client cookie.
# Skip session save for 500 responses, refs #3881.
if response.status_code != 500:
try:
request.session.save()
except UpdateError:
raise SessionInterrupted(
"The request's session was deleted before the "
"request completed. The user may have logged "
"out in a concurrent request, for example."
)
response.set_cookie(
settings.SESSION_COOKIE_NAME,
request.session.session_key, max_age=max_age,
expires=expires, domain=settings.SESSION_COOKIE_DOMAIN,
path=settings.SESSION_COOKIE_PATH,
secure=settings.SESSION_COOKIE_SECURE or None,
httponly=settings.SESSION_COOKIE_HTTPONLY or None,
samesite=settings.SESSION_COOKIE_SAMESITE,
)
return response
我需要能够在我点击特定的 URLS 时不在我的 Django 应用程序中设置会话，因为 URLs 决定去哪个数据库和会话 django 使用存储在那些数据库中
那么，请问我如何编写 SessionMiddleware 以使用 process_view 而不是 process_response()？
import time
from importlib import import_module
from django.conf import settings
from django.contrib.sessions.backends.base import UpdateError
from django.contrib.sessions.exceptions import SessionInterrupted
from django.utils.cache import patch_vary_headers
from django.utils.deprecation import MiddlewareMixin
from django.utils.functional import SimpleLazyObject
from django.utils.http import http_date
class SessionMiddleware(MiddlewareMixin):
pass
# RemovedInDjango40Warning: when the deprecation ends, replace with:
# def __init__(self, get_response):
def __init__(self, get_response=None):
super().__init__(get_response)
engine = import_module(settings.SESSION_ENGINE)
self.SessionStore = engine.SessionStore
def process_request(self, request):
session_key = request.COOKIES.get(settings.SESSION_COOKIE_NAME)
print(request.__dict__)
if hasattr(request, 'client_url'):
print('client url')
request.session = self.SessionStore(session_key)
print(self.SessionStore(session_key), self.SessionStore(session_key).__dict__)
else:
from django.contrib.sessions.backends.db import SessionStore
s = SessionStore(session_key)
print('session eluded...')
request.session = s
print('session eluded after...')
request.session = {}
def process_view(self, request, callback, callback_args, callback_kwargs):
# I NEED TO CALL THIS TO ENSURE SESSIONS ARE IN A SPECIFIC DB
pass
def process_response(self, request, response):
"""
If request.session was modified, or if the configuration is to save the
session every time, save the changes and set a session cookie or delete
the session cookie if the session has been emptied.
"""
try:
accessed = request.session.accessed
modified = request.session.modified
empty = request.session.is_empty()
except AttributeError:
return response
# First check if we need to delete this cookie.
# The session should be deleted only if the session is entirely empty.
if settings.SESSION_COOKIE_NAME in request.COOKIES and empty:
response.delete_cookie(
settings.SESSION_COOKIE_NAME,
path=settings.SESSION_COOKIE_PATH,
domain=settings.SESSION_COOKIE_DOMAIN,
samesite=settings.SESSION_COOKIE_SAMESITE,
)
patch_vary_headers(response, ('Cookie',))
else:
if accessed:
patch_vary_headers(response, ('Cookie',))
if (modified or settings.SESSION_SAVE_EVERY_REQUEST) and not empty:
if request.session.get_expire_at_browser_close():
max_age = None
expires = None
else:
max_age = request.session.get_expiry_age()
expires_time = time.time() + max_age
expires = http_date(expires_time)
# Save the session data and refresh the client cookie.
# Skip session save for 500 responses, refs #3881.
if response.status_code != 500:
try:
request.session.save()
except UpdateError:
raise SessionInterrupted(
"The request's session was deleted before the "
"request completed. The user may have logged "
"out in a concurrent request, for example."
)
response.set_cookie(
settings.SESSION_COOKIE_NAME,
request.session.session_key, max_age=max_age,
expires=expires, domain=settings.SESSION_COOKIE_DOMAIN,
path=settings.SESSION_COOKIE_PATH,
secure=settings.SESSION_COOKIE_SECURE or None,
httponly=settings.SESSION_COOKIE_HTTPONLY or None,
samesite=settings.SESSION_COOKIE_SAMESITE,
)
return response
from django.contrib import auth
def get_user(request):
if not hasattr(request, '_cached_user'):
request._cached_user = auth.get_user(request)
return request._cached_user
class AuthenticationMiddleware(MiddlewareMixin):
def process_request(self, request):
assert hasattr(request, 'session'), (
"The Django authentication middleware requires session middleware "
"to be installed. Edit your MIDDLEWARE setting to insert "
"'django.contrib.sessions.middleware.SessionMiddleware' before "
"'django.contrib.auth.middleware.AuthenticationMiddleware'."
)
request.user = SimpleLazyObject(lambda: get_user(request))
我试过的所有方法都不起作用。我需要会话不保存，除非有 URL kwarg，客户端 URL。我该怎么做？
解决方案是更改 process_request() 以检查 client_url 是否位于已解析的 request.path_info 变量中，如下所示：
import time
from importlib import import_module
from django.conf import settings
from django.contrib.sessions.backends.base import UpdateError
from django.contrib.sessions.exceptions import SessionInterrupted
from django.urls import resolve
from django.utils.cache import patch_vary_headers
from django.utils.deprecation import MiddlewareMixin
from django.utils.functional import SimpleLazyObject
from django.utils.http import http_date
class SessionMiddleware(MiddlewareMixin):
pass
# RemovedInDjango40Warning: when the deprecation ends, replace with:
# def __init__(self, get_response):
def __init__(self, get_response=None):
super().__init__(get_response)
engine = import_module(settings.SESSION_ENGINE)
self.SessionStore = engine.SessionStore
def process_request(self, request): # HERE!!!!!
session_key = request.COOKIES.get(settings.SESSION_COOKIE_NAME)
# print(request.path, resolve(request.path_info).kwargs)
if 'client_url' in resolve(request.path_info).kwargs:
print('client url found')
request.session = self.SessionStore(session_key)
# print(self.SessionStore(session_key), self.SessionStore(session_key).__dict__)
else:
# this is an error because the db cannot be found without client_url,
# but we need to assign session or auth does not work
print('session eluded...')
request.session = {}
def process_view(self, request, callback, callback_args, callback_kwargs):
# I NEED TO CALL THIS TO ENSURE SESSIONS ARE IN A SPECIFIC DB
pass
def process_response(self, request, response):
"""
If request.session was modified, or if the configuration is to save the
session every time, save the changes and set a session cookie or delete
the session cookie if the session has been emptied.
"""
try:
accessed = request.session.accessed
modified = request.session.modified
empty = request.session.is_empty()
except AttributeError:
return response
# First check if we need to delete this cookie.
# The session should be deleted only if the session is entirely empty.
if settings.SESSION_COOKIE_NAME in request.COOKIES and empty:
response.delete_cookie(
settings.SESSION_COOKIE_NAME,
path=settings.SESSION_COOKIE_PATH,
domain=settings.SESSION_COOKIE_DOMAIN,
samesite=settings.SESSION_COOKIE_SAMESITE,
)
patch_vary_headers(response, ('Cookie',))
else:
if accessed:
patch_vary_headers(response, ('Cookie',))
if (modified or settings.SESSION_SAVE_EVERY_REQUEST) and not empty:
if request.session.get_expire_at_browser_close():
max_age = None
expires = None
else:
max_age = request.session.get_expiry_age()
expires_time = time.time() + max_age
expires = http_date(expires_time)
# Save the session data and refresh the client cookie.
# Skip session save for 500 responses, refs #3881.
if response.status_code != 500:
try:
request.session.save()
except UpdateError:
raise SessionInterrupted(
"The request's session was deleted before the "
"request completed. The user may have logged "
"out in a concurrent request, for example."
)
response.set_cookie(
settings.SESSION_COOKIE_NAME,
request.session.session_key, max_age=max_age,
expires=expires, domain=settings.SESSION_COOKIE_DOMAIN,
path=settings.SESSION_COOKIE_PATH,
secure=settings.SESSION_COOKIE_SECURE or None,
httponly=settings.SESSION_COOKIE_HTTPONLY or None,
samesite=settings.SESSION_COOKIE_SAMESITE,
)
return response