django-rest-framework中如何自定义一个权限类

from rest_framework.permissions import BasePermission


class SvipPermission(BasePermission):
    # 不能访问的提示信息
    message = "必须是Svip用户才能访问"

    def has_permission(self, request, view):
        if request.user.user_type != 3:
            return False
        return True