Django教程笔记之中间件middleware详解

MIDDLEWARE_CLASSES = [
 'django.middleware.security.SecurityMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

class CommonMiddleware(object):
 def process_request(self, request):
 return None

 def process_response(self, request, response):
 return response

class BlockedIpMiddleware(object):
 def process_request(self, request):
   ...数据库拿access值
   access = access+1
   ...存起来,类似这个原理  

MIDDLEWARE_CLASSES = (
 'zjj.middleware.BlockedIpMiddleware',
 ...其它的中间件
)

import sys
from django.views.debug import technical_500_response
from django.conf import settings

class UserBasedExceptionMiddleware(object):
 def process_exception(self, request, exception):
  if request.user.is_superuser or request.META.get('REMOTE_ADDR') in settings.INTERNAL_IPS:
   return technical_500_response(request, *sys.exc_info())

MOBILE_USERAGENTS = ("2.0 MMP","240x320","400X240","AvantGo","BlackBerry",
 "Blazer","Cellphone","Danger","DoCoMo","Elaine/3.0","EudoraWeb",
 "Googlebot-Mobile","hiptop","IEMobile","KYOCERA/WX310K","LG/U990",
 "MIDP-2.","MMEF20","MOT-V","NetFront","Newt","Nintendo Wii","Nitro",
 "Nokia","Opera Mini","Palm","PlayStation Portable","portalmmm","Proxinet",
 "ProxiNet","SHARP-TQ-GX10","SHG-i900","Small","SonyEricsson","Symbian OS",
 "SymbianOS","TS21i-10","UP.Browser","UP.Link","webOS","Windows CE",
 "WinWAP","YahooSeeker/M1A1-R2D2","iPhone","iPod","Android",
 "BlackBerry9530","LG-TU915 Obigo","LGE VX","webOS","Nokia5800")

class MobileTemplate(object):
 """
 If a mobile user agent is detected, inspect the default args for the view 
 func, and if a template name is found assume it is the template arg and 
 attempt to load a mobile template based on the original template name.
 """

 def process_view(self, request, view_func, view_args, view_kwargs):
  if any(ua for ua in MOBILE_USERAGENTS if ua in 
   request.META["HTTP_USER_AGENT"]):
   template = view_kwargs.get("template")
   if template is None:
    for default in view_func.func_defaults:
     if str(default).endswith(".html"):
      template = default
   if template is not None:
    template = template.rsplit(".html", 1)[0] + ".mobile.html"
    try:
     get_template(template)
    except TemplateDoesNotExist:
     pass
    else:
     view_kwargs["template"] = template
     return view_func(request, *view_args, **view_kwargs)
  return None

class LocaleMiddleware(object):

 def process_request(self, request):

  if 'locale' in request.cookies:
   request.locale = request.cookies.locale
  else:
   request.locale = None

 def process_response(self, request, response):

  if getattr(request, 'locale', False):
   response.cookies['locale'] = request.locale