# 第一步：導(dǎo)入routers模塊
from rest_framework import routers

# 第二步：實例化得到對象
router = routers.SimpleRouter()  

# 第三步：注冊( register('前綴', viewset視圖集, 路由的別名) )
router.register('books', views.BooksViewset)

# 第四步：生成路由加入到原路由中
# 方式一：
urlpatterns = [
    ...
]
urlpatterns += router.urls

# 方式二:
urlpatterns = [
    ...
    url(r'^', include(router.urls))
]


# 形成路由如下
<URLPattern '^books/$' [name='books-list']>
<URLPattern '^books/(?P<pk>[^/.]+)/$' [name='books-detail']>

# 前兩條和SimpleRouter一樣
<URLPattern '^books/$' [name='books-list']>
<URLPattern '^books/(?P<pk>[^/.]+)/$' [name='books-detail']>

# 效果也和前兩條類似，
# 如：http://127.0.0.1:8000/books.json
<URLPattern '^books\.(?P<format>[a-z0-9]+)/?$' [name='books-list']>
# http://127.0.0.1:8000/books/1.json
<URLPattern '^books/(?P<pk>[^/.]+)\.(?P<format>[a-z0-9]+)/?$' [name='books-detail']>

# 多了個根路由http://127.0.0.1:8000/
<URLPattern '^$' [name='api-root']>, <URLPattern '^\.(?P<format>[a-z0-9]+)/?$' [name='api-root']>

from rest_framework.viewsets import ModelViewSet
from rest_framework.response import Response
from app01.ser import BooksSerializers
from app01.models import Books


class BooksViewSet(ModelViewSet):
    queryset = Books.objects.all()
    serializer_class = BooksSerializers

    # 這種方法不會自動生成，需要用action配置
    def get_num(self, request, pk):
        book = self.get_queryset()[:int(pk)]
        ser = self.get_serializer(book, many=True)
        return Response(ser.data)

from rest_framework.viewsets import ModelViewSet
from rest_framework.response import Response
from rest_framework.decorators import action
from app01.ser import BooksSerializers
from app01.models import Books


class BooksViewSet(ModelViewSet):
    queryset = Books.objects.all()
    serializer_class = BooksSerializers

    @action(methods=['GET', 'POST'], detail=True)
    def get_num(self, request, pk):
        book = self.get_queryset()[:int(pk)]	# 獲取前幾條數(shù)據(jù)
        ser = self.get_serializer(book, many=True)
        return Response(ser.data)
    
    
# 生成路由如下
http://127.0.0.1:8000/books/2/get_num/
<URLPattern '^books/(?P<pk>[^/.]+)/get_num/$' [name='books-get-num']>

# 全局使用，在setting.py中配置
REST_FRAMEWORK={
    "DEFAULT_AUTHENTICATION_CLASSES":["app01.app_auth.MyAuthentication",]
}

# 局部使用，在視圖類上寫
authentication_classes=[MyAuthentication]
# 局部禁用
authentication_classes=[]

@property
def user(self):
    # 先去判斷當(dāng)前對象中有沒有'_user'這個屬性，一開始肯定是沒有的，因為用戶是沒有登錄的
    if not hasattr(self, '_user'):
        with wrap_attributeerrors():
            # 沒有用戶，認(rèn)證出用戶
            self._authenticate()
    # 有用戶，直接返回用戶
    return self._user

def _authenticate(self):
    
    # 遍歷拿到一個認(rèn)證器，進行認(rèn)證
    # self.authenticators 配置的一堆認(rèn)證類產(chǎn)生的認(rèn)證類對象組成的 list
    # self.authenticators 就是在視圖類中配置的：authentication_classes = [認(rèn)證類1，認(rèn)證類2] 的一個個認(rèn)證類的對象：
    
    ————>self.authenticators ==》 [認(rèn)證類1對象，認(rèn)證類2對象]
    for authenticator in self.authenticators:
        try:
            
            # 認(rèn)證器調(diào)用認(rèn)證方法authenticate(認(rèn)證類對象self，request對象)
            """
            def authenticate(self, request):
        		return (self.force_user, self.force_token)
            """
            # 返回值：登錄的用戶與認(rèn)證的信息組成的 tuple
            # 并且該方法被try包裹，就代表該方法會拋異常，拋異常就代表認(rèn)證失敗
            user_auth_tuple = authenticator.authenticate(self) # self是request對象
        except exceptions.APIException:
            self._not_authenticated()
            raise
		
        # 返回值的處理
        if user_auth_tuple is not None:
            self._authenticator = authenticator
            # 如果有返回值，就將 "登錄用戶" 與 "登錄認(rèn)證" 分別保存到 request.user / request.auth
            self.user, self.auth = user_auth_tuple
            return
	# 如果返回值user_auth_tuple為空，代表認(rèn)證通過，但是沒有 "登錄用戶" 與 "登錄認(rèn)證信息"，代表游客
    self._not_authenticated()

# app01_auth.py
from rest_framework.authentication import BaseAuthentication
from rest_framework.exceptions import AuthenticationFailed
from app01.models import UserToken


class TokenAuthentication(BaseAuthentication):
    def authenticate(self, request):
        # 認(rèn)證邏輯，如果認(rèn)證通過，返回兩個值
        # 如果認(rèn)證失敗，拋出AuthenticationFailed異常
        token = request.data.get('token')
        if token:
            user_token = UserToken.objects.filter(token=token).first()

            # 認(rèn)證通過
            if user_token:
                return UserToken.user, token
            else:
                raise AuthenticationFailed('認(rèn)證失敗')
        else:
            raise AuthenticationFailed('請求地址中需要帶token')

# views.py
from rest_framework.viewsets import ModelViewSet
from rest_framework.views import APIView
from rest_framework.response import Response
from app01.models import Books, UserInfo, UserToken
from app01.ser import BooksSerializer
from app01.app01_auth import TokenAuthentication
import uuid


# 查看Books需要經(jīng)過認(rèn)證才能查看
class BooksView(ModelViewSet):
    authentication_classes = [TokenAuthentication]

    queryset = Books.objects.all()
    serializer_class = BooksSerializer


# 登錄視圖，登錄后獲得token，后續(xù)用token認(rèn)證
class LoginView(APIView):

    def post(self, request):
        response_msg = {'status': 200, 'msg': ''}
        username = request.data.get('username')
        password = request.data.get('password')
        user_obj = UserInfo.objects.filter(username=username, password=password).first()

        if user_obj:
            # 登錄成功生成一個隨機字符串
            token = uuid.uuid4()
            
            # 存到UserToken表中，update_or_create有就更新，沒有就新增
            UserToken.objects.update_or_create(defaults={'token': token}, user=user_obj)
            response_msg['msg'] = '登錄成功'
            response_msg['token'] = token
        else:
            response_msg['msg'] = '賬戶或密碼錯誤'
            response_msg['status'] = 204
        return Response(response_msg)