drf 取消csrf token校验

背景

因为csrftoken的校验一般是后端放在html模板中, 然后前端在提交form表单时一起提交给后端做校验, 但是在前后端分离的项目中, 都是通过ajax请求来完成的, 所以想取消这个校验
但是Django框架是默认开启这个校验的, 并且关闭后无法使用.

代码

先上代码, 再说原理

class CustomMiddleware(MiddlewareMixin):
  
    def process_request(self, request):
        setattr(request, "_dont_enforce_csrf_checks", True)

在中间件中, 给每一个request, 赋值_dont_enforce_csrf_checks为True

源码剖析

在django/middleware/csrf.py的CsrfViewMiddleware中有这样一个方法,

  def process_view(self, request, callback, callback_args, callback_kwargs):
        if getattr(request, 'csrf_processing_done', False):
            return None

        # Wait until request.META["CSRF_COOKIE"] has been manipulated before
        # bailing out, so that get_token still works
        if getattr(callback, 'csrf_exempt', False):
            return None

        # Assume that anything not defined as 'safe' by RFC7231 needs protection
        if request.method not in ('GET', 'HEAD', 'OPTIONS', 'TRACE'):
            if getattr(request, '_dont_enforce_csrf_checks', False):    # 这个是重点, 修改的就是这个参数, 来达到目的
                # Mechanism to turn off CSRF checks for test suite.
                # It comes after the creation of CSRF cookies, so that
                # everything else continues to work exactly the same
                # (e.g. cookies are sent, etc.), but before any
                # branches that call reject().
                return self._accept(request)