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    1. 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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