Cookie

本质上：保存在用户浏览器上键值对。

1 使用

from django.urls import path
from django.shortcuts import HttpResponse


def x1(request):
    # 包含：响应体、响应头、状态码等信息
    obj = HttpResponse("x1", status=201, reason="OK")
    # 设置响应头
    obj['name'] = "wupeiqi"

    # 设置cookie
    # import datetime
    # ctime = datetime.datetime.now() + datetime.timedelta(seconds=10)
    
    obj.set_cookie("v3", "root", max_age=10, path="/")
    obj.set_cookie("v2", "hello")
    obj.set_signed_cookie("info", "xiaoguang")  # 签名
    return obj


def x2(request):
    print(request.COOKIES)
    xx = request.get_signed_cookie("info")  # 用户不能自己修改cookie的内容
    print(xx)
    # print(request.COOKIES.get('v1'))
    # print(request.COOKIES.get('v2'))
    return HttpResponse("x2")


urlpatterns = [
    path('x1/', x1, name='x1'),
    path('x2/', x2, name='x2'),
]

2 源码

• HttpResponse，包裹

  # 包含：响应体、响应头、状态码等信息
  obj = HttpResponse("x1", status=201, reason="OK")
  
  # 设置响应头
  obj['name'] = "wupeiqi"
  
  # 设置cookie
  # import datetime
  # ctime = datetime.datetime.now() + datetime.timedelta(seconds=10)
  
  obj.set_cookie("v3", "root", max_age=10, path="/")
  obj.set_cookie("v2", "hello")
  
  obj.set_signed_cookie("info", "xiaoguang")  # 签名
  return obj
  

• WSGIRequest

  class WSGIHandler(base.BaseHandler):
      request_class = WSGIRequest
  
      def __init__(self, *args, **kwargs):
          super().__init__(*args, **kwargs)
          self.load_middleware()
  
      def __call__(self, environ, start_response):
          set_script_prefix(get_script_name(environ))
          signals.request_started.send(sender=self.__class__, environ=environ)
  
          request = self.request_class(environ)
  

  class HttpRequest:
      def get_signed_cookie(self, key, default=RAISE_ERROR, salt="", max_age=None):
          cookie_value = self.COOKIES[key]
          value = signing.get_cookie_signer(salt=key + salt).unsign(cookie_value, max_age=max_age)
  		return value
  
  class WSGIRequest(HttpRequest):
      def __init__(self, environ):
          self.environ = environ
          ...
          
      @cached_property
      def COOKIES(self):
          raw_cookie = get_str_from_wsgi(self.environ, "HTTP_COOKIE", "")
          return parse_cookie(raw_cookie)