REST framwork之认证，权限与频率

认证组件

局部视图认证

在app01.service.auth.py:

class Authentication(BaseAuthentication):

    def authenticate(self,request):
        token=request._request.GET.get("token")
        token_obj=UserToken.objects.filter(token=token).first()
        if not token_obj:
            raise exceptions.AuthenticationFailed("验证失败!")
        return (token_obj.user,token_obj)

在views.py：

def get_random_str(user):
    import hashlib,time
    ctime=str(time.time())

    md5=hashlib.md5(bytes(user,encoding="utf8"))
    md5.update(bytes(ctime,encoding="utf8"))

    return md5.hexdigest()


from app01.service.auth import *

from django.http import JsonResponse
class LoginViewSet(APIView):
    authentication_classes = [Authentication,]
    def post(self,request,*args,**kwargs):
        res={"code":1000,"msg":None}
        try:
            user=request._request.POST.get("user")
            pwd=request._request.POST.get("pwd")
            user_obj=UserInfo.objects.filter(user=user,pwd=pwd).first()
            print(user,pwd,user_obj)
            if not user_obj:
                res["code"]=1001
                res["msg"]="用户名或者密码错误"
            else:
                token=get_random_str(user)
                UserToken.objects.update_or_create(user=user_obj,defaults={"token":token})
                res["token"]=token

        except Exception as e:
            res["code"]=1002
            res["msg"]=e

        return JsonResponse(res,json_dumps_params={"ensure_ascii":False})

全局视图认证组件

settings.py配置如下：

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

权限组件

局部视图权限

在app01.service.permissions.py中：

from rest_framework.permissions import BasePermission
class SVIPPermission(BasePermission):
    message="SVIP才能访问!"
    def has_permission(self, request, view):
        if request.user.user_type==3:
            return True
        return False

在views.py：

from app01.service.permissions import *

class BookViewSet(generics.ListCreateAPIView):
    permission_classes = [SVIPPermission,]
    queryset = Book.objects.all()
    serializer_class = BookSerializers

全局视图权限

settings.py配置如下：

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

throttle(访问频率)组件

局部视图throttle

在app01.service.throttles.py中：

from rest_framework.throttling import BaseThrottle

VISIT_RECORD={}
class VisitThrottle(BaseThrottle):

    def __init__(self):
        self.history=None

    def allow_request(self,request,view):
        remote_addr = request.META.get('REMOTE_ADDR')
        print(remote_addr)
        import time
        ctime=time.time()

        if remote_addr not in VISIT_RECORD:
            VISIT_RECORD[remote_addr]=[ctime,]
            return True

        history=VISIT_RECORD.get(remote_addr)
        self.history=history

        while history and history[-1]<ctime-60:
            history.pop()

        if len(history)<3:
            history.insert(0,ctime)
            return True
        else:
            return False

    def wait(self):
        import time
        ctime=time.time()
        return 60-(ctime-self.history[-1])

在views.py中：

from app01.service.throttles import *

class BookViewSet(generics.ListCreateAPIView):
    throttle_classes = [VisitThrottle,]
    queryset = Book.objects.all()
    serializer_class = BookSerializers

全局视图throttle

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

内置throttle类

在app01.service.throttles.py修改为：

class VisitThrottle(SimpleRateThrottle):

    scope="visit_rate"
    def get_cache_key(self, request, view):

        return self.get_ident(request)

settings.py设置：

REST_FRAMEWORK={
    "DEFAULT_AUTHENTICATION_CLASSES":["app01.service.auth.Authentication",],
    "DEFAULT_PERMISSION_CLASSES":["app01.service.permissions.SVIPPermission",],
    "DEFAULT_THROTTLE_CLASSES":["app01.service.throttles.VisitThrottle",],
    "DEFAULT_THROTTLE_RATES":{
        "visit_rate":"5/m",
    }
}

根据访问频率组件Throttle 设计一个程序：

每分钟同一个IP只能访问十次

from django.db import models

# Create your models here.

class Userinfo(models.Model):
    name=models.CharField(max_length=32,verbose_name='用户名')
    pwd=models.CharField(max_length=32,verbose_name='密码')
    token=models.CharField(max_length=64,null=True)

    def __str__(self):
        return self.name

from django.shortcuts import render

# Create your views here.

import time


from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework.throttling import BaseThrottle
from rest_framework import exceptions

# Create your views here.


AllOW = {}


class MyThrottle(BaseThrottle):
    '''
    限制每分钟访问10次
    '''
    ip = '127.0.0.1'
    def allow_request(self, request, view):
        ctime = time.time()        # 当前时间。
        ip = self.ip               # IP。
        if ip not in AllOW:        # 如果IP不在ALLOW里面。
            AllOW[ip] = [ctime, ]  # 为IP设置一个当前时间。
        else:
            time_list = AllOW[ip]  # IP对应的访问时间。
            while True:
                if  not time_list:    # 这里加判断是为了防止，在time_list中没有值的时候会报错。
                    break
                if ctime - 60 > time_list[-1]:  # 当当前的时间减去60，大于最初的时间。
                    time_list.pop()   # 自动去掉最初的一条记录。
                else:
                    break
            if len(AllOW[ip]) > 9:   # 如果一分钟内，IP的访问次数超过10次。
                return False
            AllOW[ip].insert(0, ctime)
        return True

    def wait(self):
        ip = self.ip
        ctime = time.time()
        first_in_time = AllOW[ip][-1]
        wt = 60 - (ctime - first_in_time)  # 等待时间，当前时间减去最后一次的时间得到的一个数，然后再使用60秒减去这个数。
        return wt


class Limitview(APIView):
    throttle_classes = [MyThrottle,]  # 请求频率的设置为MyThrottle

    def get(self, request):
        return Response('欢迎进入python的世界！！！')

    def throttled(self, request, wait):
        class InnerThrottled(exceptions.Throttled):
            default_detail = '您的请求已被限制.'
            extra_detail_singular = 'Expected available in {wait} second.'
            extra_detail_plural = '请耐心等待{wait}秒'

        raise InnerThrottled(wait)

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^Limitview/',views.Limitview.as_view())
]

REST_FRAMEWORK = {
    'UNAUTHENTICATED_USER': None,
    'UNAUTHENTICATED_TOKEN': None,
    "DEFAULT_AUTHENTICATION_CLASSES": [
      # "app01.utils.MyAuthentication",
      #   "app02.utils.MyAuthentication",
    ],
    "DEFAULT_PERMISSION_CLASSES":[
       # "app02.utils.MyPermission",
       # "app02.utils.AdminPermission",
    ],
    "DEFAULT_THROTTLE_RATES":{
       'tiga':'10/m',
    }
}

那么我们还可以把认证，权限与频率组合起来进行一个访问频率限制：

from django.shortcuts import render
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework.authentication import BaseAuthentication
from rest_framework.permissions import BasePermission
from rest_framework.throttling import SimpleRateThrottle
from rest_framework import exceptions

from app01 import models

# Create your views here.
class MyAuthentication(BaseAuthentication):
    def authenticate(self, request):
        token=request.query_params.get(‘token‘)
        user=models.Userinfo.objects.filter(token=token).first()
        if user:
            return (user.name,user)
        return None

class UserPermission(BasePermission):
    message=‘登录用户才可以访问‘
    def has_permission(self, request, view):
        if request.user:
            return True
        return False
class AdminPermission(BasePermission):
    message=‘管理员才能访问‘
    def has_permission(self, request, view):
        if request.user ==‘ctz‘:
            return True
        return False


class AnnoThrottle(SimpleRateThrottle):
    scope = ‘anno‘
    def get_cache_key(self, request, view):
        #如果是匿名用户则执行
        if not request.user:
            return self.get_ident(request)
        #如果不是匿名用户则让他执行
        return None

class UserThrottle(SimpleRateThrottle):
    scope = ‘user‘

    def get_cache_key(self, request, view):
        #当前用户登陆了,并且当前用户不是管理员
        if request.user and request.user!=‘ctz‘:
            return self.get_ident(request)
        #如果是匿名用户和管理员 则让他继续执行
        return None

class AdminThrottle(SimpleRateThrottle):
    scope = ‘admin‘

    def get_cache_key(self, request, view):
        #如果是管理员
        if request.user==‘ctz‘:
            return self.get_ident(request)
        #不是管理员
        return  None

class IndexView(APIView):
    ‘‘‘
    要求,所有用户都能访问，匿名用户5/m,普通用户10/m,管理员不限
    ‘‘‘
    authentication_classes = [MyAuthentication,]
    permission_classes = []
    throttle_classes = [AnnoThrottle,UserThrottle,AdminThrottle]
    def get(self,request):
        return Response(‘首页‘)

    def throttled(self, request, wait):
        class UserInnerThrottled(exceptions.Throttled):
            default_detail = ‘请求被限制.‘
            extra_detail_singular = ‘Expected available in {wait} second.‘
            extra_detail_plural = ‘还需要再等待{wait}秒‘
        raise UserInnerThrottled(wait)



class UserView(APIView):
    ‘‘‘
    要求:登录用户能访问,普通用户10/m,管理员20/m
    ‘‘‘
    authentication_classes = [MyAuthentication,]
    permission_classes = [UserPermission,]
    throttle_classes = [UserThrottle,AdminThrottle]
    def get(self,request):
        return Response(‘用户界面‘)

    def permission_denied(self, request, message=None):
        """
        If request is not permitted, determine what kind of exception to raise.
        """

        if request.authenticators and not request.successful_authenticator:
            raise exceptions.NotAuthenticated(‘无权访问‘)
        raise exceptions.PermissionDenied(detail=message)


    def throttled(self, request, wait):
        class UserInnerThrottled(exceptions.Throttled):
            default_detail = ‘请求被限制.‘
            extra_detail_singular = ‘Expected available in {wait} second.‘
            extra_detail_plural = ‘还需要再等待{wait}秒‘
        raise UserInnerThrottled(wait)

class ManageView(APIView):
    ‘‘‘
    要求:只有管理园能访问,5/m
    ‘‘‘
    authentication_classes = [MyAuthentication,]
    permission_classes = [AdminPermission,]
    throttle_classes = [AdminThrottle]
    def get(self,request):
        return Response(‘管理员界面‘)

    def permission_denied(self, request, message=None):
        """
        If request is not permitted, determine what kind of exception to raise.
        """

        if request.authenticators and not request.successful_authenticator:
            raise exceptions.NotAuthenticated(‘无权访问‘)
        raise exceptions.PermissionDenied(detail=message)

    def throttled(self, request, wait):
        class UserInnerThrottled(exceptions.Throttled):
            default_detail = ‘请求被限制.‘
            extra_detail_singular = ‘Expected available in {wait} second.‘
            extra_detail_plural = ‘还需要再等待{wait}秒‘
        raise UserInnerThrottled(wait)

from django.db import models

# Create your models here.
class Userinfo(models.Model):
    name=models.CharField(max_length=32,verbose_name=‘用户名‘)
    pwd=models.CharField(max_length=32,verbose_name=‘密码‘)
    token=models.CharField(max_length=64,null=True)

    def __str__(self):
        return self.name

REST_FRAMEWORK = {
    ‘UNAUTHENTICATED_USER‘: None,
    ‘UNAUTHENTICATED_TOKEN‘: None,
    "DEFAULT_AUTHENTICATION_CLASSES": [
      # "app01.utils.MyAuthentication",
        "app02.utils.MyAuthentication",
    ],
    "DEFAULT_PERMISSION_CLASSES":[
       "app02.utils.MyPermission",
       "app02.utils.AdminPermission",
    ],
    "DEFAULT_THROTTLE_RATES":{
       ‘tiga‘:‘10/m‘,
       ‘anno‘:‘5/m‘,
       ‘user‘:‘10/m‘,
       ‘admin‘:‘20/m‘,
    }
}

   url(r‘^index/‘, views.IndexView.as_view()),
    url(r‘^user/‘, views.UserView.as_view()),
    url(r‘^manage/‘, views.ManageView.as_view()),