自定义用户登录，会话保持，自动跳转

# -*- coding: UTF-8 -*-
from django.shortcuts import render
from django.http import HttpResponse,HttpResponseRedirect
from django.core.urlresolvers import reverse
from django.contrib.auth import authenticate,login as auth_login,logout as auth_logout
from aptest.forms import hvform,testform,vmform,lusersform
from aptest.models import lusers
import time
# Create your views here.

global user_loggedin,login_url,index_url
user_loggedin=‘Guest‘ #设置未登录的默认用户名为Guest
login_url = ‘../login‘ #设置登录页面url
index_url = ‘../‘ #设置登陆成功后跳转到主页url

#定义登录检查函数
def login_req(url=login_url):
    def getFun(func):
        def wrapper(request,*args, **kv):
            global user_loggedin #将user_loggedin设置为global，否则其他view获取不到该值
            request.session[‘backurl‘]  = request.path #获取当前页面的url，登录成功后自动跳转回该页面，获取不到则为None
            #request.session.set_expiry(1800)
            userinfo = request.session.get(‘s_username‘,None) #获取session，如果获取不到则设置为None       
            if not userinfo:
                return HttpResponseRedirect(url) #没有登录，则跳转到登录页面    
            else:
                user_loggedin=request.session[‘s_username‘]  #获取当前登录用户名 
            return func(request,*args, **kv)   
        return wrapper
    return getFun

#定义主页函数
def index(request):
    return HttpResponse(u"欢迎光临 aa!")


@login_req()
def add(request):
    a=3
    b=55
    c=int(a)+int(b)
    err=[]
    if request.method == ‘POST‘:
        #print request.POST[‘hvname‘],request.POST[‘hvip‘]
        print request.method
        form = hvform(request.POST)
        
        if form.is_valid(): #判断输入数据是否合法
            #print form
            #print form.cleaned_data[‘name‘],form.cleaned_data[‘ip‘]
            fc = form.cleaned_data
            print fc[‘name‘],fc[‘ip‘]
        else:
            err.append(form.errors) #输出错误信息
    else:
        form = hvform()

    hour_offset= time.ctime()
    ls = range(10)
    context={‘hour_offset‘:hour_offset,‘ls‘:ls,‘err‘:err,‘user_loggedin‘:user_loggedin}
    return render(request,‘aptest/form.html‘,context)


@login_req() #使用装饰函数，登录前检查是否已登录
def testvw(request):
    err=[]
    if request.method == ‘POST‘:
        print request.method
        form = vmform(request.POST)
        if form.is_valid(): #判断输入数据是否合法
            fc = form.cleaned_data
            print fc[‘hvname‘],fc[‘name‘],fc[‘cpu‘]
        else:
            err.append(form.errors) #输出错误信息
    else:
        form = vmform()
    context={‘err‘:err,‘user_loggedin‘:user_loggedin}
    return render(request,‘aptest/current_datetime.html‘,context)


#定义用户登录函数，并判断登录后是否自动跳转到前一个页面，还是跳转到主页
def login(request):
    global user_loggedin
    errors_list=[]
    if request.method == ‘POST‘:
        form = lusersform(request.POST)
        if form.is_valid(): 
            fc = form.cleaned_data
            #print fc[‘name‘],fc[‘password‘]
            try:
                usero = lusers.objects.get(name=fc[‘name‘])
                if usero.password == fc[‘password‘]:
                    request.session[‘s_username‘] = usero.name  #设置该用户的session
                    user_loggedin = usero.name #获取登陆后用户的用户名
                    #print ‘login -get backurl: ‘,request.session.get(‘backurl‘),request.session[‘s_username‘]
                    if request.session.get(‘backurl‘) is not None: #检查跳转前的url是否存在
                        redirecturl = request.session[‘backurl‘]    
                    else:
                        redirecturl = index_url #跳转前的url不存在则跳转到主页
                    return HttpResponseRedirect(redirecturl)
                else:
                    errors_list.append(‘password is not correct!‘)

            except Exception:
                errors_list.append(fc[‘name‘] + ‘ Doesnot Exists‘)

        else:
            errors_list.append(form.errors) #输出字段格式错误信息
    else:
        form = lusersform()

    context={‘errors_list‘:errors_list,‘user_loggedin‘:user_loggedin}
    return render(request,‘aptest/login.html‘,context)

#定义注销函数
def logout(request):
    try:
        #删除保存用户名和跳转前url的session
        del request.session[‘s_username‘] 
        del request.session[‘backurl‘]
    except KeyError as e:
        pass
    #注销登陆后跳转到原页面
    #return HttpResponseRedirect(request.META.get(‘HTTP_REFERER‘, ‘/‘))
    return HttpResponseRedirect(‘../login‘)