想必大家或多或少都听过微软推出的ASP.NET Identity技术，可以简单的认为就是一种授权的实现
很巧的是，Nancy中也有与之相类似的技术Authentication， 这两者之间都用到了一些相通的安全技术
(我没有去看ASP.NET Identity的内部实现，是从它的简单用法中判断的)
正式开始介绍之前先推荐几篇ASP.NET Identity的好文章
r01cn 的 ASP.NET Identity系列教程（目录）
腾飞（Jesse）的 MVC5 - ASP.NET Identity登录原理 - Claims-based认证和OWIN
好了，下面还是用demo的形式来介绍怎么简单使用Forms authentication吧
1 Install-Package Nancy2 Install-Package Nancy.Hosting.Aspnet3 Install-Package Nancy.Authentication.Forms4 Install-Package Dapper
由于用到了数据库访问，所以还安装了Dapper
1 CREATE TABLE [dbo].[SystemUser]( 2 [SystemUserId] [uniqueidentifier] NOT NULL, 3 [SystemUserName] [nvarchar](50) NOT NULL, 4 [SystemUserPassword] [nvarchar](50) NOT NULL, 5 CONSTRAINT [PK_SystemUser] PRIMARY KEY CLUSTERED 6 ( 7 [SystemUserId] ASC 8 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 9 ) ON [PRIMARY]10 GO
同时像表中插入两条数据
1 INSERT INTO [dbo].[SystemUser]([SystemUserId],[SystemUserName],[SystemUserPassword])2 VALUES(newid(),'catcher','123')3 INSERT INTO [dbo].[SystemUser]([SystemUserId],[SystemUserName],[SystemUserPassword])4 VALUES(newid(),'admin','123')
Models用于存放模型
Modules用于存放相应的操作
Views用于存放视图
1 public class SystemUser2 {3 public Guid SystemUserId { get; set; }4 public string SystemUserName { get; set; }5 public string SystemUserPassword { get; set; }6 } 1 using Dapper; 2 using Nancy; 3 using Nancy.Authentication.Forms; 4 using Nancy.ModelBinding; 5 using NancyDemoForFormsauthentication.Models; 6 using System.Data; 7 using System.Data.SqlClient; 8 using System.Linq; 9 namespace NancyDemoForFormsauthentication.Modules10 {11 public class HomeModule : NancyModule12 {13 public HomeModule()14 {15 Get["/"] = _ =>16 {17 return View["index"];18 };19 Get["/login"] = _ =>20 {21 return View["login"];22 };23 Post["/login"] = _ =>24 {25 var loginUser = this.Bind<SystemUser>();26 SystemUser user = GetValidUser(loginUser.SystemUserName, loginUser.SystemUserPassword);27 if (user == null)28 {29 return Response.AsText("出错了", "text/html;charset=UTF-8");30 }31 return this.LoginAndRedirect(user.SystemUserId, fallbackRedirectUrl: "/secure");32 };33 }34 private readonly string sqlconnection =35 "Data Source=127.0.0.1;Initial Catalog=NancyDemo;User Id=sa;Password=dream_time1314;";36 private SqlConnection OpenConnection()37 {38 SqlConnection connection = new SqlConnection(sqlconnection);39 connection.Open();40 return connection;41 }42 private SystemUser GetValidUser(string name, string pwd)43 {44 using (IDbConnection conn = OpenConnection())45 {46 const string query = "select * from SystemUser where SystemUserName=@SystemUserName and SystemUserPassword=@SystemUserPassword";47 return conn.Query<SystemUser>(query, new { SystemUserName = name, SystemUserPassword = pwd }).SingleOrDefault();48 }49 }50 }51 } 其中，登录的post方法中用到了 LoginAndRedirect 这个静态方法
这个方法位于ModuleExtensions.cs中，返回值是Response类型的
1 public static Response LoginAndRedirect(this INancyModule module, Guid userIdentifier, DateTime? cookieExpiry = null, string fallbackRedirectUrl = "/")2 {3 return FormsAuthentication.UserLoggedInRedirectResponse(module.Context, userIdentifier, cookieExpiry, fallbackRedirectUrl);4 }看方法名都能知道这个是用来干什么的！
还有Response.AsText后面的第二个参数可以让中文不乱码！！
index.html
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <title></title> 5 <meta charset="utf-8" /> 6 </head> 7 <body> 8 <h2>Nancy之基于Forms authentication的简单使用</h2> 9 <p>访问需要权限的页面</p>10 <a href="/secure">secure</a>11 </body>12 </html>
login.html
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <title></title> 5 <meta charset="utf-8" /> 6 </head> 7 <body> 8 <form method="post" action="/login"> 9 <label>姓名：</label><input type="text" name="SystemUserName" /><br />10 <label>密码：</label><input type="password" name="SystemUserPassword" /><br />11 <input type="submit" />12 </form>13 </body>14 </html>
1 using Nancy; 2 using Nancy.Security; 3 4 namespace NancyDemoForFormsauthentication.Modules 5 { 6 public class SecureModule : NancyModule 7 { 8 public SecureModule() 9 {10 this.RequiresAuthentication();11 Get["/secure"] = _ =>12 {13 return "Hello ," + this.Context.CurrentUser.UserName;14 };15 }16 }17 } 其中
1 this.RequiresAuthentication();
这句是关键！！表明需要验证才能通过。位于Nancy.Security这个命名空间
通过验证访问后会打印出当前的用户名称。
1 using Nancy; 2 using Nancy.Authentication.Forms; 3 using Nancy.TinyIoc; 4 using Nancy.Bootstrapper; 5 namespace NancyDemoForFormsauthentication 6 { 7 public class Bootstrapper : DefaultNancyBootstrapper 8 { 9 protected override void ConfigureRequestContainer(TinyIoCContainer container, NancyContext context)10 {11 base.ConfigureRequestContainer(container, context);12 container.Register<IUserMapper, UserMapper>();13 }14 protected override void RequestStartup(TinyIoCContainer container, IPipelines pipelines, NancyContext context)15 {16 base.RequestStartup(container, pipelines, context);17 var formsAuthConfiguration = new FormsAuthenticationConfiguration18 {19 RedirectUrl = "~/login",20 UserMapper = container.Resolve<IUserMapper>(),21 };22 FormsAuthentication.Enable(pipelines, formsAuthConfiguration);23 }24 }25 } 这里是至关重要的一步！！！
要在RequestStartup中启用我们的FormsAuthentication！！
同时我们还要配置FormsAuthenticationConfiguration
注册了UserMapper，所以我们接下来就是实现UserMapper
1 using Dapper; 2 using Nancy; 3 using Nancy.Authentication.Forms; 4 using Nancy.Security; 5 using NancyDemoForFormsauthentication.Models; 6 using System; 7 using System.Data; 8 using System.Data.SqlClient; 9 using System.Linq;10 namespace NancyDemoForFormsauthentication11 {12 public class UserMapper : IUserMapper13 {14 public IUserIdentity GetUserFromIdentifier(Guid identifier, NancyContext context)15 {16 using (IDbConnection conn = OpenConnection())17 {18 const string query = "select * from SystemUser where SystemUserId=@SystemUserId";19 var user = conn.Query<SystemUser>(query, new { SystemUserId = identifier }).SingleOrDefault();20 if (user == null)21 {22 return null;23 }24 else25 {26 return new UserIdentity27 {28 UserName = user.SystemUserName,29 Claims = new[] { "SystemUser"}30 };31 }32 }33 }34 private readonly string sqlconnection =35 "Data Source=127.0.0.1;Initial Catalog=NancyDemo;User Id=sa;Password=dream_time1314;";36 private SqlConnection OpenConnection()37 {38 SqlConnection connection = new SqlConnection(sqlconnection);39 connection.Open();40 return connection;41 }42 }43 } UserMapper必须要实现IUserMapper这个接口！同时返回一个实现IUserIdentity接口的对象。
1 using Nancy.Security; 2 using System.Collections.Generic; 3 namespace NancyDemoForFormsauthentication 4 { 5 public class UserIdentity : IUserIdentity 6 { 7 public string UserName { get; set; } 8 public IEnumerable<string> Claims { get; set; } 9 }10 } 到这里所有的工作都已经做完了，下面就是看看效果了
我们点击 secure链接，发现自动跳转到登录界面了！！
我们输入用户名和密码
登录成功，并返回到secure页面了！
当我们输入错误的用户名和密码时
最后是本次示例代码：
https://github.com/hwqdt/Demos/tree/master/src/NancyDemoForFormsauthentication
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