drf权限组件

from app01 import models
from rest_framework import exceptions
from rest_framework.authentication import BaseAuthentication


# 用drf的认证,写一个类
class LoginAuth(BaseAuthentication):
    # 函数名一定要叫authenticate,接收必须两个参数,第二个参数是request对象
    def authenticate(self, request):
        # 从request对象中取出token(也可以从其它地方取)
        token = request.query_params.get('token')
        # 去数据库过滤,查询
        ret = models.UserToken.objects.filter(token=token).first()
        if ret:
            # 能查到,说明认证通过,返回空
            # ret.user就是当前登录用户对象
            return ret.user, ret
        # 如果查不到,抛异常
        raise exceptions.APIException('您认证失败')

from rest_framework.permissions import BasePermission
class UserPermission(BasePermission):
    # message是出错显示的中文
    message='您没有权限查看'
    def has_permission(self, request, view):
        user_type = request.user.user_type
        # 取出用户类型对应的文字
        # 固定用法:get_字段名字_display()
        user_type_name = request.user.get_user_type_display()
        print(user_type_name)
        if user_type == 2:
            return True
        else:
            return False

from rest_framework import serializers
from app01 import models


class BookSerializer(serializers.ModelSerializer):
    class Meta:
        model = models.Book
        fields='__all__'

class AuthorSerializer(serializers.ModelSerializer):
    class Meta:
        model = models.Author
        fields='__all__'


class UserSer(serializers.ModelSerializer):
    class Meta:
        model = models.UserInfo
        fields='__all__'

    # user_type=serializers.CharField(source='get_user_type_display')
    user_type=serializers.SerializerMethodField()
    def get_user_type(self,obj):
        return obj.get_user_type_display()