python框架之Django(7)-CBV中添加装饰器

现有如下检查登录装饰器：

 1 from functools import wraps
 2 
 3 
 4 def check_login(func):
 5     @wraps(func)
 6     def inner(request, *args, **kwargs):
 7         next_url = request.get_full_path()
 8         if request.session.get("user"):
 9             return func(request, *args, **kwargs)
10         else:
11             return redirect("/login/?next={}".format(next_url))
12     return inner

Code

使用

要在CBV视图中使用我们上面的check_login装饰器，有以下三种方式：

加在的get或post方法上

 1 from django.utils.decorators import method_decorator
 2 
 3 
 4 class HomeView(View):
 5 
 6     def dispatch(self, request, *args, **kwargs):
 7         return super(HomeView, self).dispatch(request, *args, **kwargs)
 8 
 9     def get(self, request):
10         return render(request, "home.html")
11     
12     @method_decorator(check_login)
13     def post(self, request):
14         print("Home View POST method...")
15         return redirect("/index/")

Code

加在dispatch方法上

 1 from django.utils.decorators import method_decorator
 2 
 3 
 4 class HomeView(View):
 5 
 6     @method_decorator(check_login)
 7     def dispatch(self, request, *args, **kwargs):
 8         return super(HomeView, self).dispatch(request, *args, **kwargs)
 9 
10     def get(self, request):
11         return render(request, "home.html")
12 
13     def post(self, request):
14         print("Home View POST method...")
15         return redirect("/index/")

Code

因为CBV中首先执行的就是dispatch方法，所以这么写相当于给get和post方法都加上了登录校验。

加在视图类上

直接加在视图类上，但method_decorator必须传name关键字参数。如果get方法和post方法都需要登录校验的话就写两个装饰器。

 1 from django.utils.decorators import method_decorator
 2 
 3 @method_decorator(check_login, name="get")
 4 @method_decorator(check_login, name="post")
 5 class HomeView(View):
 6 
 7     def dispatch(self, request, *args, **kwargs):
 8         return super(HomeView, self).dispatch(request, *args, **kwargs)
 9 
10     def get(self, request):
11         return render(request, "home.html")
12 
13     def post(self, request):
14         print("Home View POST method...")
15         return redirect("/index/")

Code

补充

CSRF Token相关装饰器

• csrf_protect

  为当前函数强制设置防跨站请求伪造功能，即便settings中没有设置全局中间件。

• csrf_exempt

  取消当前函数防跨站请求伪造功能，即便settings中设置了全局中间件。

• 使用

  CSRF Token相关装饰器在CBV只能加到dispatch方法上，或者加在视图类上然后name参数指定为dispatch方法。

  

   1 from django.views.decorators.csrf import csrf_exempt, csrf_protect
   2 from django.utils.decorators import method_decorator
   3 
   4 
   5 class HomeView(View):
   6 
   7     @method_decorator(csrf_exempt)
   8     def dispatch(self, request, *args, **kwargs):
   9         return super(HomeView, self).dispatch(request, *args, **kwargs)
  10 
  11     def get(self, request):
  12         return render(request, "home.html")
  13 
  14     def post(self, request):
  15         print("Home View POST method...")
  16         return redirect("/index/")

  加到dispatch方法上
  

   1 from django.views.decorators.csrf import csrf_exempt, csrf_protect
   2 from django.utils.decorators import method_decorator
   3 
   4 
   5 @method_decorator(csrf_exempt, name='dispatch')
   6 class HomeView(View):
   7    
   8     def dispatch(self, request, *args, **kwargs):
   9         return super(HomeView, self).dispatch(request, *args, **kwargs)
  10 
  11     def get(self, request):
  12         return render(request, "home.html")
  13 
  14     def post(self, request):
  15         print("Home View POST method...")
  16         return redirect("/index/")

  加在视图类上