python框架之Django(8)-CBV中添加装饰器

现有如下检查登录装饰器：

from functools import wraps


def check_login(func):
    @wraps(func)
    def inner(request, *args, **kwargs):
        next_url = request.get_full_path()
        if request.session.get("user"):
            return func(request, *args, **kwargs)
        else:
            return redirect("/login/?next={}".format(next_url))
    return inner

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

from django.utils.decorators import method_decorator


class HomeView(View):

    def dispatch(self, request, *args, **kwargs):
        return super(HomeView, self).dispatch(request, *args, **kwargs)

    def get(self, request):
        return render(request, "home.html")
    
    @method_decorator(check_login)
    def post(self, request):
        print("Home View POST method...")
        return redirect("/index/")

加在dispatch方法上

from django.utils.decorators import method_decorator


class HomeView(View):

    @method_decorator(check_login)
    def dispatch(self, request, *args, **kwargs):
        return super(HomeView, self).dispatch(request, *args, **kwargs)

    def get(self, request):
        return render(request, "home.html")

    def post(self, request):
        print("Home View POST method...")
        return redirect("/index/")

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。

from django.utils.decorators import method_decorator

@method_decorator(check_login, name="get")
@method_decorator(check_login, name="post")
class HomeView(View):

    def dispatch(self, request, *args, **kwargs):
        return super(HomeView, self).dispatch(request, *args, **kwargs)

    def get(self, request):
        return render(request, "home.html")

    def post(self, request):
        print("Home View POST method...")
        return redirect("/index/")

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。

  from django.views.decorators.csrf import csrf_exempt, csrf_protect
  from django.utils.decorators import method_decorator
  
  
  class HomeView(View):
  
      @method_decorator(csrf_exempt)
      def dispatch(self, request, *args, **kwargs):
          return super(HomeView, self).dispatch(request, *args, **kwargs)
  
      def get(self, request):
          return render(request, "home.html")
  
      def post(self, request):
          print("Home View POST method...")
          return redirect("/index/")

  from django.views.decorators.csrf import csrf_exempt, csrf_protect
  from django.utils.decorators import method_decorator
  
  
  @method_decorator(csrf_exempt, name='dispatch')
  class HomeView(View):
     
      def dispatch(self, request, *args, **kwargs):
          return super(HomeView, self).dispatch(request, *args, **kwargs)
  
      def get(self, request):
          return render(request, "home.html")
  
      def post(self, request):
          print("Home View POST method...")
          return redirect("/index/")