Django之cookie&session

<div class="markdown-here-wrapper" data-md-url="https://i.cnblogs.com/EditPosts.aspx?postid=9962659"&gt;
<h1 id="cookie" style="margin: 20px 0px 10px; padding: 0px; font-weight: bold; color: black; font-size: 24px; border-bottom: 2px solid #aaaaaa;">cookie
<blockquote style="margin: 1.2em 0px; border-left: 4px solid #dddddd; padding: 0px 1em; color: #777777; quotes: none;">
<p style="margin: 0px 0px 1.2em !important; font-size: 16px; line-height: 1.75em; padding-right: 0.5em; padding-left: 0.5em;">Cookie 是在 HTTP 协议下，服务器或脚本可以维护客户工作站上信息的一种方式。Cookie 是由 Web 服务器保存在用户浏览器（客户端）上的小文本文件，它可以包含有关用户的信息。无论何时用户链接到服务器，Web 站点都可以访问 Cookie 信息

用户浏览器中写下的信息，用来存储用户当前的状态或该用户相关的信息，如是否已经登录。使用cookie的原因：HTTP协议是无状态的协议。一旦数据交换完毕，客户端与服务器端的连接就会关闭，再次交换数据需要建立新的连接。

ottom: 2px solid #aaaaaa;">在Django中使用cookie

一个用户登录的例子：用户登录后，在其浏览器中写入username键值对，并在其他页面判断是否有username

display: block; overflow: auto; overflow-x: auto; background: #f1efee; color: #68615e; text-size-adjust: none;">
 arams" style="color: #df5320;">(views.View):
     arams" style="color: #df5320;">(self,req,*args,**kwargs):
         render(req,,{: })
<span class="hljs-function" style="color: #407ee7;"&gt;<span class="hljs-keyword" style="color: #6666ea;"&gt;def</span> <span class="hljs-title" style="color: #766e6b;"&gt;post</span><span class="hljs-p<a href="/tag/ara/" target="_blank" class="keywords">ara</a>ms" style="color: #df5320;"&gt;(self,**<a href="/tag/kwargs/" target="_blank" class="keywords">kwargs</a>)</span>:</span>
    user = req.POST.get(<span class="hljs-string" style="color: #5ab738;"&gt;'user'</span>)
    pwd = req.POST.get(<span class="hljs-string" style="color: #5ab738;"&gt;'pwd'</span>)
    c = models.Administrator.objects.filter(username=user,password=pwd).count()
    <span class="hljs-keyword" style="color: #6666ea;"&gt;if</span> c > <span class="hljs-number" style="color: #df5320;"&gt;0</span>:
        rep = redirect(<span class="hljs-string" style="color: #5ab738;"&gt;'/index/'</span>)
        newuser = user.encode(<span class="hljs-string" style="color: #5ab738;"&gt;'utf-8'</span>).decode(<span class="hljs-string" style="color: #5ab738;"&gt;'latin-1'</span>)
        rep.set_cookie(<span class="hljs-string" style="color: #5ab738;"&gt;'username'</span>,newuser,max_age=<span class="hljs-number" style="color: #df5320;"&gt;10</span>)
        <span class="hljs-keyword" style="color: #6666ea;"&gt;return</span> rep
    <span class="hljs-keyword" style="color: #6666ea;"&gt;else</span>:
        massage = <span class="hljs-string" style="color: #5ab738;"&gt;'<a href="/tag/yonghuming/" target="_blank" class="keywords">用户名</a>或<a href="/tag/mimap/" target="_blank" class="keywords">密码</a><a href="/tag/cuowu/" target="_blank" class="keywords">错误</a>'</span>
    <span class="hljs-keyword" style="color: #6666ea;"&gt;return</span> render(req,{<span class="hljs-string" style="color: #5ab738;"&gt;'massage'</span>: massage})
<span class="hljs-function" style="color: #407ee7;"><span class="hljs-keyword" style="color: #6666ea;">def <span class="hljs-title" style="color: #766e6b;">index<span class="hljs-params" style="color: #df5320;">(req):

username=req.COOKIES.get(<span class="hljs-string" style="color: #5ab738;">'username')

<span class="hljs-keyword" style="color: #6666ea;">if username:

newuser=username.encode(<span class="hljs-string" style="color: #5ab738;">'latin-1').decode(<span class="hljs-string" style="color: #5ab738;">'utf-8')

<span class="hljs-keyword" style="color: #6666ea;">return render(req,<span class="hljs-string" style="color: #5ab738;">"app1/index.html",{<span class="hljs-string" style="color: #5ab738;">"name": newuser})

<span class="hljs-keyword" style="color: #6666ea;">return redirect(<span class="hljs-string" style="color: #5ab738;">"/login")

<p style="margin: 0px 0px 1.2em !important; font-size: 16px; line-height: 1.75em; padding-right: 0.5em; padding-left: 0.5em;">查看set_cookie参数

display: block; overflow: auto; overflow-x: auto; background: #f1efee; color: #68615e; text-size-adjust: none;">
 arams" style="color: #df5320;">(self,key,value=,max_age=None,expires=None,path=,domain=None,secure=False,httponly=False,samesite=None):

• 功能类似，如果不设置expires，函数会根据max_age自动设置expires，原因是ie浏览器需要expires
• 默认为’/‘，表示所有url
• 默认为当前域名
• 属性设置为true时，cookie只有在https协议下才能上传到服务器，而在http协议下是没法上传的
• 获取和修改
• 功能，此标志可防止cookie在跨站点请求中发送，从而防止CSRF攻击并使某些方法无法窃取会话cookie。None表示不适用此标志，还有Strict与Lax参数，具体查看goproject.com/en/2.1/ref/settings/#std:setting-SESSION_COOKIE_SAMESITE">https://docs.djangoproject.com/en/2.1/ref/settings/#std:setting-SESSION_COOKIE_SAMESITE

删除cookie

display: block; overflow: auto; overflow-x: auto; background: #f1efee; color: #68615e; text-size-adjust: none;">response.delete_cookie()

ottom: 2px solid #aaaaaa;">session

在这里我们可以叫它会话，既然是会话，那么就是一段时间的交流，交流的状态就需要保持着。对于cookie来说，数据或者用户相关信息是存放在客户的浏览器上，这样导致你的相关信息容易被暴露，让别人更容易进行cookie欺骗，如果可以将相关信息存放到服务器端，那么这种风险就会相对较低一些。使用的方式就是session客户端浏览器访问服务器的时候，服务器把客户端信息以某种形式记录在服务器上叫做session，当客户端浏览器再次访问时只需要从该Session中查找该客户的状态就可以了。客户端识别是哪一个用户的方式为为其分配一个SessionId。session内部也是通过cookie实现的。

ottom: 2px solid #aaaaaa;">在Django中使用session

登录认证的例子首先登录视图函数

 c > :
            req.session[] = 
            req.session[] = user
             redirect()
        :
            massage = 用户名或密码错误'
         render(req,{: massage})

用户是否登录的装饰器

display: block; overflow: auto; overflow-x: auto; background: #f1efee; color: #68615e; text-size-adjust: none;">
 arams" style="color: #df5320;">(func):
     arams" style="color: #df5320;">(request,**kwargs):
        is_login = request.session.get()
         is_login:
             func(request,**kwargs)
        :
             redirect()
     inner

函数，只需要为其添加auth装饰器即可这里发现，对于设置session和拿取session，和cookie的操作方式类似，那么它将设置的信息存储到了哪呢？答案是存到了数据库中在数据库中发现了一张diango_session的表，存储的信息为

ottom: 1px solid #aaaaaa;">session的其他方法

• 删除某条
• 删除所有
• 输出为dict_keys([‘is_login’,‘username’])，可for循环，不可以通过索引取值
• 输出dict_values([True,‘sfencs’])，同上
• 输出dict_items([(‘is_login’,True),(‘username’,‘sfencs’)])，同上
• 用户session的随机字符串
• 删除
• 用户session的随机字符串在数据库中是否存在
• 默认为两周。如果value是个整数，session会在些秒数后失效。如果value是个datatime或timedelta，session就会在这个时间后失效。如果value是0,用户关闭浏览器session就会失效。如果value是None,session会依赖全局session失效策略。

ottom: 1px solid #aaaaaa;">session的配置

display: block; overflow: auto; overflow-x: auto; background: #f1efee; color: #68615e; text-size-adjust: none;">SESSION_COOKIE_NAME ＝    
SESSION_COOKIE_PATH ＝                   
SESSION_COOKIE_DOMAIN =          默认）
SESSION_COOKIE_SECURE =          默认）
SESSION_COOKIE_HTTPONLY =       支持http传输（默认）
SESSION_COOKIE_AGE =           默认）
SESSION_EXPIRE_AT_broWSER_CLOSE =        关闭浏览器使得Session过期（默认）
SESSION_SAVE_EVERY_REQUEST =           默认修改之后才保存（默认）

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