django学习-29.表单提交方式之一：post请求(注册/登录/改密)

# coding:utf-8
'''
@file: userViews.py
@author: 洪景盛
@ide: PyCharm
@createTime: 2021年02月23日  11点02分
@contactInformation: 727803257@qq.com
'''

# 请从这行开始编写脚本

# 在这个py文件里，只存储操作数据表user的所有视图函数
from django.shortcuts import render
from django.http import HttpResponse,Http404,JsonResponse
from hello.models import User
from django.contrib.auth.hashers import make_password,check_password
import re

def register(request):
    '''用户注册页面对应的视图函数'''
    res = ''
    if request.method == 'POST':
        username = request.POST.get('username')  # 用户名
        password = request.POST.get('password')  # 密码
        mail = request.POST.get('mail')  # 注册邮箱
        # 先查询数据库是否已经有这个用户名
        user_list = User.objects.filter(user_name=username)
        if len(user_list) !=0 or user_list:
            # 如果这个用户名已存在，就给个提示
            res = '用户名为【%s】的用户已被注册!'%username
            return render(request, 'user/register_html.html', {"rename":res})
         # 如果这个用户名不存在即还没被注册，就执行新增数据到数据表的操作(涉及到sql新增语句)
        else:
            # 第一种写法(推荐以后都用这种写法)
            user = User()
            user.user_name  = username
            user.user_psw   = make_password(password)
            user.user_email = mail
            user.save()

            # 第二种写法(不推荐)
            # user = User(user_name=username,user_psw=password,user_email=mail)
            # user.save()

            return render(request,'user/register_success_html.html')
    return render(request, "user/register_html.html")

def register_success(request):
    '''用户注册成功后跳转到的注册成功页面对应的视图函数'''
    return render(request,'user/register_success_html.html')


def login(request):
    '''登录页面对应的视图函数'''
    # 第1步：判断请求方式是不是post
    if request.method == 'POST':
        # 第2歩：获取登录页面传给这个视图函数的每个提交字段的字段值
        username = request.POST.get("username")
        password = request.POST.get("password")
        # 第3步：查询用户名是否存在：如果不存在则返回一个用户名相关的错误提示语
        user_list_1 = User.objects.filter(user_name=username)
        if len(user_list_1) == 0:
            error_of_username = '用户名为【%s】的用户不存在，请重新输入!'%username
            return render(request,'user/login_html.html',{"error_of_username":error_of_username})


        # 第4步：校验密码：如果校验不通过则返回一个密码相关的错误提示语；如果校验通过则允许登录成功并跳转到后台主页；
        user_list_2 = User.objects.filter(user_name=username).first()
        is_password_true = check_password(password,user_list_2.user_psw)
        if is_password_true:
            return render(request,'index/index_html.html')
        else:
            error_of_password = '密码错误，请重新输入!'
            return render(request,'user/login_html.html',{"error_of_password":error_of_password})

    else:
        return render(request,"user/login_html.html")


def update_password(request):
    '''修改登录密码页面对应的视图函数'''
    if request.method == 'GET':
        return render(request,"user/update_password_html.html")

    if request.method == 'POST':
        username = request.POST.get("username") # 用户名
        old_password = request.POST.get("old_password") # 旧密码
        new_password = request.POST.get("new_password") # 旧密码

        if len(username)>10:
            error_of_username = '用户名的长度不能超过10'
            # data = {}
            # data["code"] = 100
            # data["success"] = False
            # data["error_of_username"] = error_of_username
            # return JsonResponse(data,json_dumps_params={"ensure_ascii":False})    # 返回一个json串
            return render(request,"user/update_password_html.html",{"error_of_username":error_of_username})
        if len(old_password)>10:
            error_of_old_password = '旧密码的长度不能超过10'
            return render(request,"user/update_password_html.html",{"error_of_old_password":error_of_old_password})
        if len(new_password)>10:
            error_of_new_password = '新密码的长度不能超过10'
            return render(request,"user/update_password_html.html",{"error_of_new_password":error_of_new_password})
        if old_password == new_password:
            error_of_new_password = '新密码不能跟旧密码一样'
            return render(request,"user/update_password_html.html",{"error_of_new_password":error_of_new_password})

        regex = "^[0-9a-zA-Z_]{1,}$"
        if not re.search(regex,old_password):
            error_of_old_password = '旧密码的值只能由数字和英文字母和下划线组成'
            return render(request,"user/update_password_html.html",{"error_of_old_password":error_of_old_password})
        if not re.search(regex,new_password):
            error_of_new_password = '新密码的值只能由数字和英文字母和下划线组成'
            return render(request,"user/update_password_html.html",{"error_of_new_password":error_of_new_password})


        user_list1 = User.objects.filter(user_name=username).values()
        if len(user_list1) == 0:
            error_of_username = '不存在用户名为【%s】的用户'%username
            return render(request,"user/update_password_html.html",{"error_of_username":error_of_username})

        user_list_2 = User.objects.filter(user_name=username).first()
        is_password_true = check_password(old_password,user_list_2.user_psw)

        if not is_password_true:
            error_of_old_password = '旧密码错误，请重新输入'
            return render(request,"user/update_password_html.html",{"error_of_old_password":error_of_old_password})
        else:
            user = User.objects.get(user_name=username)
            user.user_psw = make_password(new_password)
            user.save()
            # return HttpResponse("密码更新成功！")
            return render(request,"user/update_password_success_html.html")