265 第八篇：Django Rest Framework-权限组件

一 权限简介

只用超级用户才能访问指定的数据，普通用户不能访问，所以就要有权限组件对其限制

二 局部使用

from rest_framework.permissions import BasePermission
class UserPermission(BasePermission):
    message = '不是超级用户，查看不了'
    def has_permission(self, request, view):
        # user_type = request.user.get_user_type_display()
        # if user_type == '超级用户':
        user_type = request.user.user_type
        print(user_type)
        if user_type == 1:
            return True
        else:
            return False
class Course(APIView):
    authentication_classes = [TokenAuth, ]
    permission_classes = [UserPermission,]
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    </span><span style="color: rgba(0, 0, 255, 1)">return</span> HttpResponse(<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">get</span><span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(0, 0, 0, 1)">)

</span><span style="color: rgba(0, 0, 255, 1)">def</span><span style="color: rgba(0, 0, 0, 1)"> post(self, request):
    </span><span style="color: rgba(0, 0, 255, 1)">return</span> HttpResponse(<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">post</span><span style="color: rgba(128, 0, 0, 1)">'</span>)</pre>

局部使用只需要在视图类里加入：

permission_classes = [UserPermission,]

三 全局使用

REST_FRAMEWORK={
    "DEFAULT_AUTHENTICATION_CLASSES":["app01.service.auth.Authentication",],
    "DEFAULT_PERMISSION_CLASSES":["app01.service.permissions.SVIPPermission",]
}

四 源码分析

def check_permissions(self, request):
    for permission in self.get_permissions():
        if not permission.has_permission(request, self):
            self.permission_denied(
                request, message=getattr(permission, 'message', None)
                )

self.get_permissions()

def get_permissions(self):
     return [permission() for permission in self.permission_classes]

权限类使用顺序：先用视图类中的权限类，再用settings里配置的权限类，最后用默认的权限类