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        JWT自定义校验规则与生成、用户多种方式登陆、搜索过滤,排序,分页


        # 自定义校验token规则
        1.视图类
        from .authentications import JWTAuthentication
        
        class UserDetail1(APIView):
            permission_classes = [IsAuthenticated]  # 必须登录
            authentication_classes = [JWTAuthentication]  # jwt用户token自定义登陆认证规则
        
            def get(self, request, *args, **kwargs):
                return APIResponse(results={username: request.user.username})
        2.自定义token规则,在api生成一个authentications.py认证文件
        import jwt
        from rest_framework_jwt.authentication import BaseJSONWebTokenAuthentication
        from rest_framework_jwt.authentication import jwt_decode_handler
        from rest_framework.exceptions import AuthenticationFailed
        
        class JWTAuthentication(BaseJSONWebTokenAuthentication):
            def authenticate(self, request):
                jwt_token = request.META.get(HTTP_AUTHORIZATION)
        
                # 自定义规则 :auth token jwt,调用下面规则方法
                token = self.parse_jwt_token(jwt_token)
        
                # 如果没有值,无法校验
                if token is None:
                    return None
        
                try:
                    # token =>payload  反向解析出payload
                    payload = jwt_decode_handler(token)
                except jwt.ExpiredSignature:  # 判断是否过期
                    raise AuthenticationFailed(token已过期)
                except:
                    raise AuthenticationFailed(非法用户)
                user = self.authenticate_credentials(payload) # 根据payload解析出user
        
                return (user, token)
        
            # 自定义校验规则:auth token jwt ,auth为前言,jwt为后缀
            def parse_jwt_token(self, jw_token):
                tokens = jw_token.split()
                if len(tokens) != 3 or tokens[0].lower() != auth or tokens[2].lower() != jwt:
                    return None
                # 把token核心内容返回进行校验
                return tokens[1]

        # 自定义 drf-jwt 配置
        import datetime
        JWT_AUTH = {
            # user => payload
            JWT_PAYLOAD_HANDLER:
                rest_framework_jwt.utils.jwt_payload_handler,
            # payload => token
            JWT_ENCODE_HANDLER:
                rest_framework_jwt.utils.jwt_encode_handler,
            # token => payload
            JWT_DECODE_HANDLER:
                rest_framework_jwt.utils.jwt_decode_handler,
            # token过期时间
            JWT_EXPIRATION_DELTA: datetime.timedelta(days=7),
            # token刷新的过期时间
            JWT_REFRESH_EXPIRATION_DELTA: datetime.timedelta(days=7),
            # 反爬小措施前缀
            JWT_AUTH_HEADER_PREFIX: JWT,
        }

        实现多种方式登录签发token:比如 -账号、手机号、邮箱等登录:
        1.禁用认证与权限组件
        2.拿到前台登录信息,交给序列化类
        3.序列化校验得到登陆用户与token存放在序列化对象中
        4.取出登陆用户与token返回给前台
        """

        from .serializers import UserModelSerializer

        # 1.视图类
        class LoginAPIView(APIView):
            authentication_classes = []  # 禁用认证
            permission_classes = []  # 禁用权限
        
            def post(self, request, *args, **kwargs):
                user_ser = UserModelSerializer(data=request.data)  # 反序列化进行校验
                # 校验通过,如果没有报异常
                user_ser.is_valid(raise_exception=True)
        
                # 正常登陆,把生成的token返回给前端
                return APIResponse(token=user_ser.token, results=UserModelSerializer(user_ser.user).data)
          
        #2. 序列化类,进行校验,生成token发送出去
        from rest_framework import serializers
        from . import models
        import re
        
        from rest_framework_jwt.serializers import jwt_payload_handler, jwt_encode_handler
        
        class UserModelSerializer(serializers.ModelSerializer):
            # 自定义反序列化字段:一定要设置write_only,值参与反序列化,不会与model类字段映射
            usr = serializers.CharField(write_only=True)
            pwd = serializers.CharField(write_only=True)
        
            class Meta:
                model = models.User
                fields = [usr, pwd, username, mobile, email]
                # 系统校验规则
                extra_kwargs = {
                    # ‘usr‘: {
                        # ‘required‘: True,  # 必须校验
                    #     ‘min_length‘: 3,
                    #     ‘error_messages‘: {
                    #         ‘required‘: ‘必须填写,你个铺盖‘,
                    #         ‘min_length‘: ‘太短楼!‘,
                    #     }
                    # },
                    username: {
                        read_only: True
                    },
                    mobile: {
                        read_only: True
                    },
                    email: {
                        read_only: True
                    }
        
                }
        
            # 全局钩子,attrs里面是通过校验的
            def validate(self, attrs):
                usr = attrs.get(usr)
                pwd = attrs.get(pwd)
                # 多方式登录:各分支处理得到该方式对应的用户
                if re.match(r[email protected]+, usr):
                    user_query = models.User.objects.filter(email=usr)
                elif re.match(r1[3-9][0-9]{9}, usr):
                    user_query = models.User.objects.filter(mobile=usr)
                else:
                    user_query = models.User.objects.filter(username=usr)
                user_obj = user_query.first()
        
                if user_obj and user_obj.check_password(pwd):
                    # 签发生成token,将token存放到实例化对象的中
                    payload = jwt_payload_handler(user_obj)  # 把头部,和载荷过期时间,user对象,生成payload
                    token = jwt_encode_handler(payload)  # 把头部,载荷,和秘=秘钥经过加密生成token
                    self.token = token  # 把token赋值到对象中
                    self.user = user_obj
                    print(token)
                    return attrs
                raise serializers.ValidationError({data: 数据提供有误})
         
        搜索过滤,排序,分页:
        from . import models
        from .serializers import CarModelSerializer
        # Car的群查接口
        from rest_framework.generics import ListAPIView
        
        # 1.drf的SearchFilter - 搜索过滤
        from rest_framework.filters import SearchFilter
        
        # 2.drf的OrderingFilter - 排序过滤
        from rest_framework.filters import OrderingFilter
        
        # 3.drf的分页类 - 自定义
        from . import pagenations
        
        class CarListAPIView(ListAPIView):
            permission_classes = []  # 权限取消
            authentication_classes = []  # 认证取消
        
            queryset = models.Car.objects.all()
            serializer_class = CarModelSerializer
        
            # 局部配置 过滤类 们(全局配置用DEFAULT_FILTER_BACKENDS)
            filter_backends = [SearchFilter,OrderingFilter]
        
            # SearchFilter过滤类依赖的过滤条件 => 接口:/cars/?search=...
            search_fields = [name, price]
        
            # OrderingFilter过滤类依赖的过滤条件 => 接口:/cars/?ordering=...,正是升序,-则是降序
            ordering_fields = [pk, price]
            # eg:/cars/?ordering=-price,pk,先按price降序,如果出现price相同,再按pk升序
        
            pagination_class = pagenations.MyPageNumberPagination
         
        # 自定义分页类
        from rest_framework.pagination import PageNumberPagination
        
        class MyPageNumberPagination(PageNumberPagination):
            # ?page=页码
            page_query_param = page
        
            # ?page=页面 下默认一页显示的条数
            page_size = 3
        
            # ?page=页面&page_size=条数 用户自定义一页显示的条数
            page_size_query_param = page_size
        
            max_page_size = 5
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