Cookie session-526互联

今日概要

【零】发展史

一开始：只有一个页面，没有登录功能，大家看到东西都一样
- 新闻
时代发展，出现了需要登录注册的网站，要有一门技术存储我们的登录信息
- 京东、天猫
- cookie
  - 存储形式：k:v键值对
  - 存储位置：客户端
  - 不安全，信息可能会泄露
时代发展，需要有一门新的安全的技术
- session
- 标识符，来表示我是当前用户加密出来的数据
- 对敏感信息进行加密处理
  - 存储服务端：
  - 标识符配合上你的加密串
- 把我的标识符+ 字符串全给客户端
  - 客户端存储格式
    - session_id:返回回来的表示符+加密串
token
- 三段式加密

【一】Cookie

【1】设置cookie

HttpResponse
render
redriect

obj = HttpResponse("ok")
obj.set_cookie('k','v')

设置cookie

def login(request, *args, **kwargs):
if request.method == 'POST':
username = request.POST.get("username")
password = request.POST.get("password")
if username == "dream" and password == "521":
obj = HttpResponse("ok")
obj.set_cookie('sign', 'user')
return obj
else:
return redirect('/login/')
return render(request, 'login.html')
取值cookie验证

def home(request, *args, **kwargs):
sign = request.COOKIES.get('sign')
if sign and sign == 'user':
return HttpResponse("这是home页面")
else:
return redirect('/login/')

【2】取值

request.COOKIES.get('k')

完整版 cookie登录注册

def login(request, *args, **kwargs):
# next_url = request.get_full_path()
# print(next_url) # /login/?next_url=/home/
if request.method == 'POST':
username = request.POST.get("username")
password = request.POST.get("password")
if username == "dream" and password == "521":
next_url = request.GET.get('next_url')
# print(next_url) # /home/
obj = redirect(next_url)
obj.set_cookie('sign', 'user')
return obj
else:
return redirect('/login/')
return render(request, 'login.html')

def login_auth(func):
def inner(request, *args, **kwargs):
# print(request.path_info) # /home/
# print(request.get_full_path()) # /home/?username=111
next_url = request.get_full_path() # /home/
# print(next_url)# /home/
sign = request.COOKIES.get('sign')
if sign and sign == 'user':
res = func(request, *args, **kwargs)
return res
else:
return redirect(f'/login/?next_url={next_url}')
```
  return inner
```
@login_auth
def home(request, *args, **kwargs):
return HttpResponse("这是home页面")

def home(request, *args, **kwargs):

sign = request.COOKIES.get('sign')

if sign and sign == 'user':

return HttpResponse("这是home页面")

else:

return redirect('/login/')

@login_auth
def index(request, *args, **kwargs):
return HttpResponse("这是index页面")

【3】设置过期时间

obj.set_cookie('sign', 'user', expires=3)
obj.set_cookie('sign', 'user', max_age=3)

【4】刪除cookie

def logout(request, *args, **kwargs):
    obj = redirect('/home/')
    # 设置超时时间 5s 到期
    obj.delete_cookie('sign')
    return obj

【二】Session

【1】设置session

request.session['sign'] = 'user'

【2】取值session

sign = request.session.get('sign')

def login(request, *args, **kwargs):
    # next_url = request.get_full_path()
    # print(next_url) # /login/?next_url=/home/
    if request.method == 'POST':
        username = request.POST.get("username")
        password = request.POST.get("password")
        if username == "dream" and password == "521":
            # next_url = request.GET.get('next_url')
            # print(next_url) # /home/
            request.session['sign'] = 'user'
            obj = redirect('/home/')
            # 设置过期时间
            # obj.set_cookie('sign', 'user', expires=3)
            # obj.set_cookie('sign', 'user', max_age=3)
            return obj
        else:
            return redirect('/login/')
    return render(request, 'login.html')


def login_auth(func):
    def inner(request, *args, **kwargs):
        # print(request.path_info) #  /home/
        # print(request.get_full_path()) # /home/?username=111
        next_url = request.get_full_path()  # /home/
        # print(next_url)# /home/
        sign = request.session.get('sign')
        # print(sign) # user
        if sign and sign == 'user':
            res = func(request, *args, **kwargs)
            return res
        else:
            return redirect(f'/login/?next_url={next_url}')

    return inner


@login_auth
def home(request, *args, **kwargs):
    return HttpResponse("这是home页面")

【3】注意

session基于数据库表才能使用的
- 必须先迁移数据库，生成 django_session 表
session只对当次登录有效
- 主动清除浏览器中本地存在的session
- 验签发现，没有sessionid就会自动生成新的session
django_sessoin表中的数据条数取决于浏览器
同一个计算机(IP地址)上同一个浏览器只会有一条数据生效
同一个计算机(IP地址)上多个浏览器会有多个数据生效
当session过期的时候，可能会出现多条数据对应一个浏览器
- 但是这些数据不会持久化存储，会被定时清理掉，可以手动清除也可以代码清除
目的是为了节省服务器数据库资源

【4】session设置过期时间

            request.session['sign'] = 'user'
            # 如果是数字的话就是指定 s shu
            # request.session.set_expiry(3)
            # 0 就是关闭浏览器后自动清除浏览器的sessionid
            request.session.set_expiry(0)

【5】删除session

    # 删除session方式一
    # request.session.delete()
    # 把浏览器和数据库里面的session全部清除掉
    request.session.flush()

【三】Token

【四】CBV加装饰器的三种方法

from django.utils.decorators import method_decorator

# 方式二：放在类视图上面 (放的装饰器函数,name指定你的视图函数里面的方法)
# @method_decorator(login_auth, name='get')
# @method_decorator(login_auth, name='post')
class UserView(View):
    
    # 方式三 ： dispactch 方法加装饰器 ： 本视图函数内所有的视图都需要走装饰器
    @method_decorator(login_auth)
    def dispatch(self, request, *args, **kwargs):
        # Try to dispatch to the right method; if a method doesn't exist,
        # defer to the error handler. Also defer to the error handler if the
        # request method isn't on the approved list.
        if request.method.lower() in self.http_method_names:
            handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
        else:
            handler = self.http_method_not_allowed
        return handler(request, *args, **kwargs)
    
    # 方式一：加载视图函数上面
    # @method_decorator(login_auth)
    def get(self, request, *args, **kwargs):
        return HttpResponse("这是home页面")

    def post(self):
        ...