Email:账号激活/密码找回

我们在很多时候(比如重置密码),都需要用户的Email。但在使用之前,需要保证用户输入的Email是:

真实有效,且
属于当前用户的
惯常的办法就是对其进行验证/激活。

策略

如图所示:

用户:输入他的Email地址,提交给服务器
服务器:为该Email生成一个验证码code(为了安全期间,还可以有一个有限截止时间),将email和code一起保存到数据库
服务器:将验证码code发送到该Email中。为了方便用户操作,通常是发送一个链接,链接中包含该code和Email的Id
用户:从Email邮箱中获得code(或者直接点击发送过来的链接),到服务器激活
服务器:将用户输入的code和数据库中的存储的值进行比对,如果无误的话,激活该email(email.IsValid=true)
整个流程的关键就在于:用户只能通过他留下的email获取激活code。

实现

发送Email
Email并不能在用户之间直接传递,而是依赖于邮件的:

发送服务器(如下图:smtp.163.com)
接收服务器(如下图:pop.qq.com)

发送方(sender)将email推送给邮件发送服务器。这一过程可以由用户登录邮箱网站完成,或使用其他邮箱软件(如outlook)推送
163.com按邮件收件人地址将email推送到qq.com服务器
收件方(receiver)从服务器拉取自己的email
上述3个过程,1和2都是推送,使用SMTP(Simple Mail Transfer Protocol)协议;3是拉取,使用的是POP3协议。

我们开发只关注第1个阶段。.NET为我们提供了现成的类库:

首先,引入命名空间:

using System.Net.Mail; //注意不要引用成System.Web.Mail
然后,用一个MailMessage对象配置Email本身的相关信息:

MailMessage mail = new MailMessage();
mail.From = new MailAddress(ConfigurationManager.AppSettings["EmailAddress"]);
mail.To.Add(address);
mail.Subject = "激活Email";
mail.IsBodyHtml = true;  //最终呈现样式由收件服务器决定
mail.Body = $"感谢你的注册……";接下来,配置SMTP服务器(自己邮箱所在)

不能使用SSL方式发送

邮箱地址:[email protected]

密码:yuanzhan17bang(登录) / yz17bang(客户端授权)

(演示:略)

中的难点:

按职责:
url格式(使用的http协议、域名、路径、url参数名等)均在UI层生成

        string validationUrlFormat = 
            $"{Request.Scheme}://{Request.Host}/Email/Validate?{_code}={{0}}&{_id}={{1}}";

Email验证码应在BLL层生成

    public void MakeValidationCode()
    {
        ValidationCode = new Random().Next().ToString();
    }

Email的Id需要在Email被Repository存储之后才能生成

    public void Save(Email email)
    {
        Emails.Add(email);
        SaveChanges();
    }

那么,Email的发送应该是哪一个层的职责?
如何保证验证码只生成一次?
构造函数和属性都会被EF反复调用,不宜使用(演示:略)。
注意:不建议在Entity(需要映射到数据库的实体类)的构造函数和属性中加入业务逻辑
方法如何防止被多次调用?

        //体会:异常使用的场景
        if (!string.IsNullOrEmpty(ValidationCode))
        {
            throw new InvalidOperationException(
                $"在ValidationCode已有值的情况下(当前值为:{ValidationCode}),试图再次生成");
        }

课间作业:

事实上有没有激活?
为什么需要:if (!string.IsNullOrEmpty(id) && !string.IsNullOrEmpty(code))
补充:exception

作业:

实现用户登录全部功能,包括:导航栏变更(登录/退出登录)、新手任务等

此后所有作业都需要按项目流程:发布需求 - 承接 - 验收,团队实现,此后不再重复说明。

作业点评:

注意entity的可访问性 (只读)
需求文档:一体两用(开发/测试)
开发设计文档 vs 需求文档
一定要指定完成时间,未及时完成项目经理要催

示例:

原需求:可以使用邮箱找回密码,点击发送邮件获取验证码,用验证码重置密码,重置密码的邮件会发送到你填写的Email中。
问题:

找回密码的入口(页面)在哪里?页面内容如何?
发送邮件如何获取验证码?弹出提示吗?
如何用验证码重置密码?需要自己填写吗?https://github.com/hdfgfgh546...
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