DRF的版本
版本控制是做什么用的, 我们为什么要用
首先我们要知道我们的版本是干嘛用的呢~~大家都知道我们开发项目是有多个版本的~~
当我们项目越来越更新~版本就越来越多~~我们不可能新的版本出了~以前旧的版本就不进行维护了~~~
那我们就需要对版本进行控制~~这个DRF也给我们提供了一些封装好的版本控制方法~~
版本控制怎么用
之前我们学视图的时候知道APIView，也知道APIView返回View中的view函数，然后调用的dispatch方法~
执行self.initial方法之前是各种赋值，包括request的重新封装赋值，下面是路由的分发，那我们看下这个方法都做了什么~~
我们可以看到，我们的version版本信息赋值给了 request.version 版本控制方案赋值给了 request.versioning_scheme~~
只是DRF默认的版本信息是None，我们需要重写一些配置，让request.version携带上我自定义的版本信息
request.versioning_scheme是实现版本控制的类的实例化对象~
详细用法
a. 基于url的get传参方式
如：/users?version=v1
REST_FRAMEWORK = { 'DEFAULT_VERSION': 'v1', # 默认版本 'ALLOWED_VERSIONS': ['v1', 'v2'], # 允许的版本 'VERSION_PARAM': 'version' # URL中获取值的key }
from django.conf.urls import url, include from web.views import TestView urlpatterns = [ url(r'^test/', TestView.as_view(),name='test'), ]
#!/usr/bin/env python # -*- coding:utf-8 -*- from rest_framework.views import APIView from rest_framework.response import Response from rest_framework.versioning import QueryParameterVersioning class TestView(APIView): versioning_class = QueryParameterVersioning def get(self, request, *args, **kwargs): # 获取版本 print(request.version) # 获取版本管理的类 print(request.versioning_scheme) # 反向生成URL reverse_url = request.versioning_scheme.reverse('test', request=request) print(reverse_url) return Response('GET请求，响应内容') def post(self, request, *args, **kwargs): return Response('POST请求，响应内容') def put(self, request, *args, **kwargs): return Response('PUT请求，响应内容') views.py
b. 基于url的正则方式
如：/v1/users/
REST_FRAMEWORK = { 'DEFAULT_VERSION': 'v1', # 默认版本 'ALLOWED_VERSIONS': ['v1', 'v2'], # 允许的版本 'VERSION_PARAM': 'version' # URL中获取值的key }
from django.conf.urls import url, include from web.views import TestView urlpatterns = [ url(r'^(?P<version>[v1|v2]+)/test/', TestView.as_view(), name='test'), ] urls.py
#!/usr/bin/env python # -*- coding:utf-8 -*- from rest_framework.views import APIView from rest_framework.response import Response from rest_framework.versioning import URLPathVersioning class TestView(APIView): versioning_class = URLPathVersioning def get(self, request, *args, **kwargs): # 获取版本 print(request.version) # 获取版本管理的类 print(request.versioning_scheme) # 反向生成URL reverse_url = request.versioning_scheme.reverse('test', request=request) print(reverse_url) return Response('GET请求，响应内容') def post(self, request, *args, **kwargs): return Response('POST请求，响应内容') def put(self, request, *args, **kwargs): return Response('PUT请求，响应内容') views.py
c. 基于 accept 请求头方式
如：Accept: application/json; version=1.0
REST_FRAMEWORK = { 'DEFAULT_VERSION': 'v1', # 默认版本 'ALLOWED_VERSIONS': ['v1', 'v2'], # 允许的版本 'VERSION_PARAM': 'version' # URL中获取值的key }
from django.conf.urls import url, include from web.views import TestView urlpatterns = [ url(r'^test/', TestView.as_view(), name='test'), ]
#!/usr/bin/env python # -*- coding:utf-8 -*- from rest_framework.views import APIView from rest_framework.response import Response from rest_framework.versioning import AcceptHeaderVersioning class TestView(APIView): versioning_class = AcceptHeaderVersioning def get(self, request, *args, **kwargs): # 获取版本 HTTP_ACCEPT头 print(request.version) # 获取版本管理的类 print(request.versioning_scheme) # 反向生成URL reverse_url = request.versioning_scheme.reverse('test', request=request) print(reverse_url) return Response('GET请求，响应内容') def post(self, request, *args, **kwargs): return Response('POST请求，响应内容') def put(self, request, *args, **kwargs): return Response('PUT请求，响应内容')
d. 基于主机名方法
如：v1.example.com
ALLOWED_HOSTS = ['*'] REST_FRAMEWORK = { 'DEFAULT_VERSION': 'v1', # 默认版本 'ALLOWED_VERSIONS': ['v1', 'v2'], # 允许的版本 'VERSION_PARAM': 'version' # URL中获取值的key }
from django.conf.urls import url, include from web.views import TestView urlpatterns = [ url(r'^test/', TestView.as_view(), name='test'), ]
#!/usr/bin/env python # -*- coding:utf-8 -*- from rest_framework.views import APIView from rest_framework.response import Response from rest_framework.versioning import HostNameVersioning class TestView(APIView): versioning_class = HostNameVersioning def get(self, request, *args, **kwargs): # 获取版本 print(request.version) # 获取版本管理的类 print(request.versioning_scheme) # 反向生成URL reverse_url = request.versioning_scheme.reverse('test', request=request) print(reverse_url) return Response('GET请求，响应内容') def post(self, request, *args, **kwargs): return Response('POST请求，响应内容') def put(self, request, *args, **kwargs): return Response('PUT请求，响应内容')
e. 基于django路由系统的namespace
如：example.com/v1/users/
REST_FRAMEWORK = { 'DEFAULT_VERSION': 'v1', # 默认版本 'ALLOWED_VERSIONS': ['v1', 'v2'], # 允许的版本 'VERSION_PARAM': 'version' # URL中获取值的key }
from django.conf.urls import url, include from web.views import TestView urlpatterns = [ url(r'^v1/', ([ url(r'test/', TestView.as_view(), name='test'), ], None, 'v1')), url(r'^v2/', ([ url(r'test/', TestView.as_view(), name='test'), ], None, 'v2')), ]
#!/usr/bin/env python # -*- coding:utf-8 -*- from rest_framework.views import APIView from rest_framework.response import Response from rest_framework.versioning import NamespaceVersioning class TestView(APIView): versioning_class = NamespaceVersioning def get(self, request, *args, **kwargs): # 获取版本 print(request.version) # 获取版本管理的类 print(request.versioning_scheme) # 反向生成URL reverse_url = request.versioning_scheme.reverse('test', request=request) print(reverse_url) return Response('GET请求，响应内容') def post(self, request, *args, **kwargs): return Response('POST请求，响应内容') def put(self, request, *args, **kwargs): return Response('PUT请求，响应内容')
f. 全局使用
REST_FRAMEWORK = { 'DEFAULT_VERSIONING_CLASS':"rest_framework.versioning.URLPathVersioning", 'DEFAULT_VERSION': 'v1', 'ALLOWED_VERSIONS': ['v1', 'v2'], 'VERSION_PARAM': 'version' }
DRF的versioning模块
# 基础类 class BaseVersioning(object): default_version = api_settings.DEFAULT_VERSION allowed_versions = api_settings.ALLOWED_VERSIONS version_param = api_settings.VERSION_PARAM def determine_version(self, request, *args, **kwargs): msg = '{cls}.determine_version() must be implemented.' raise NotImplementedError(msg.format( cls=self.__class__.__name__ )) def reverse(self, viewname, args=None, kwargs=None, request=None, format=None, **extra): return _reverse(viewname, args, kwargs, request, format, **extra) def is_allowed_version(self, version): if not self.allowed_versions: return True return ((version is not None and version == self.default_version) or (version in self.allowed_versions)) # 在请求头中携带版本信息 class AcceptHeaderVersioning(BaseVersioning): """ GET /something/ HTTP/1.1 Host: example.com Accept: application/json; version=1.0 """ # 在URL中携带版本信息 class URLPathVersioning(BaseVersioning): ''' urlpatterns = [ url(r'^(?P<version>[v1|v2]+)/users/$', users_list, name='users-list'), url(r'^(?P<version>[v1|v2]+)/users/(?P<pk>[0-9]+)/$', users_detail, name='users-detail') ] ''' # 在namespace中携带版本信息 class NamespaceVersioning(BaseVersioning): ''' # users/urls.py urlpatterns = [ url(r'^/users/$', users_list, name='users-list'), url(r'^/users/(?P<pk>[0-9]+)/$', users_detail, name='users-detail') ] # urls.py urlpatterns = [ url(r'^v1/', include('users.urls', namespace='v1')), url(r'^v2/', include('users.urls', namespace='v2')) ] ''' # 在域名中携带版本信息 class HostNameVersioning(BaseVersioning): """ GET /something/ HTTP/1.1 Host: v1.example.com Accept: application/json """ # 在参数中携带版本信息 class QueryParameterVersioning(BaseVersioning)： """ GET /something/?version=0.1 HTTP/1.1 Host: example.com Accept: application/json """
DRF的认证
上面讲版本的时候我们知道~在dispatch方法里~执行了initial方法~~那里初始化了我们的版本~~
如果我们细心我们能看到~版本的下面其实就是我们的认证，权限，频率组件了~~
我们先看看我们的认证组件~~
我们进去我们的认证看下~~
我们这个权限组件返回的是request.user，那我们这里的request是新的还是旧的呢~~
我们的initial是在我们request重新赋值之后的~所以这里的request是新的~也就是Request类实例对象~~
那这个user一定是一个静态方法~我们进去看看~~
很明显，有传参
我们通过上面基本可以知道我们的认证类一定要实现的方法~~以及返回值类型~~以及配置的参数authentication_classes~
DRF的权限
权限是什么
大家之前都应该听过权限~那么我们权限到底是做什么用的呢~~
大家都有博客~或者去一些论坛~一定知道管理员这个角色~
比如我们申请博客的时候~一定要向管理员申请~也就是说管理员会有一些特殊的权利~是我们没有的~~
这些对某件事情决策的范围和程度~我们叫做权限~~权限是我们在项目开发中非常常用到的~~
那我们看DRF框架给我们提供的权限组件都有哪些方法~~
权限组件源码
我们之前说过了DRF的版本和认证~也知道了权限和频率跟版本认证都是在initial方法里初始化的~~
其实我们版本，认证，权限，频率控制走的源码流程大致相同~~大家也可以在源码里看到~~
我们的权限类一定要有has_permission方法~否则就会抛出异常~~这也是框架给我提供的钩子~~
我们先看到在rest_framework.permissions这个文件中~存放了框架给我们提供的所有权限的方法~~
我这里就不带着大家详细去看每一个了~大家可以去浏览一下每个权限类~看看每个都是干嘛的~~
这里主要说下BasePermission 这个是我们写权限类继承的一个基础权限类~~~
认证权限的详细用法
用户url传入的token认证
from django.db import models # Create your models here. class User(models.Model): name = models.CharField(max_length=32) pwd = models.CharField(max_length=32) token = models.UUIDField(null=True, blank=True)#随机字符串 CHOICES = ((1, "vip"), (2, "普通用户"), (3, "vvip")) type = models.IntegerField(choices=CHOICES, default=2)
执行：makemigrations AuthDemo
migrate AuthDemo
from django.conf.urls import url, include from django.contrib import admin urlpatterns = [ url(r'^admin/', admin.site.urls), url(r'^book/', include("SerDemo.urls")), url(r'^api/user/', include("AuthDemo.urls")), url(r'^api/(?P<version>[v1|v2]+)/', include("VersionDemo.urls")), ]
from django.conf.urls import url, include from django.contrib import admin from .views import RegisterView, LoginView, TestView, PermissionView urlpatterns = [ url(r'^register', RegisterView.as_view()), url(r'^login', LoginView.as_view()), url(r'^test', TestView.as_view()), url(r'^permission', PermissionView.as_view()), ]
from django.shortcuts import render from rest_framework.views import APIView from rest_framework.response import Response from .models import User import uuid from utils.auth import MyAuth from utils.permission import MyPermission # Create your views here. class RegisterView(APIView): def post(self, request): name = request.data.get("name", "") pwd = request.data.get("pwd", "") if name and pwd: User.objects.create(name=name, pwd=pwd) return Response("注册成功") return Response("用户名或密码不合法") class LoginView(APIView): def post(self, request): name = request.data.get("name", "") pwd = request.data.get("pwd", "") user_obj = User.objects.filter(name=name, pwd=pwd).first() if user_obj: # 登录成功 创建一个token并给前端返回 token = uuid.uuid4() user_obj.token = token user_obj.save() return Response(token) return Response("用户名或密码错误") class TestView(APIView): authentication_classes = [MyAuth, ] def get(self, request): print(request.user) print(request.user.name) print(request.auth) return Response("登录后发送的数据") class PermissionView(APIView): authentication_classes = [MyAuth, ] permission_classes = [MyPermission, ] def get(self, request): # 这个接口只能vip或者vvip访问 return Response("权限测试接口")
REST_FRAMEWORK = { # "DEFAULT_VERSIONING_CLASS": "utils.version.MyVersion", "DEFAULT_VERSIONING_CLASS": "rest_framework.versioning.URLPathVersioning", 'DEFAULT_VERSION': "v1", 'ALLOWED_VERSIONS': ["v1", "v2"], 'VERSION_PARAM': 'version', # 配置认证类 # "DEFAULT_AUTHENTICATION_CLASSES": ["utils.auth.MyAuth", ] }
from rest_framework import permissions class MyPermission(permissions.BasePermission): message = "请充VIP，999一年" def has_permission(self, request, view): # 判断用户是否有权限 if request.user.type in [1, 3]: return True return False
from django.db import models # Create your models here. class User(models.Model): name = models.CharField(max_length=32) pwd = models.CharField(max_length=32) token = models.UUIDField(null=True, blank=True) CHOICES = ((1, "vip"), (2, "普通用户"), (3, "vvip")) type = models.IntegerField(choices=CHOICES, default=2)