/// <summary>
/// 登录
/// </summary>
/// <param name="name"></param>
/// <param name="passWord"></param>
/// <param name="backUrl"></param>
/// <returns></returns>
[HttpPost]
public string Login(string name, string passWord, string backUrl)
{
 if (true)//TODO：验证用户名密码登录
 {
  //用Session标识会话是登录状态
  Session["user"] = "XX已经登录";
  //在认证中心 保存客户端Client的登录认证码
  TokenIds.Add(Session.SessionID, Guid.NewGuid());
 }
 else//验证失败重新登录
 {
  return "/Home/Login";
 }
 return backUrl + "?tokenId=" + TokenIds[Session.SessionID];//生成一个tokenId 发放到客户端
}

public static List<string> Tokens = new List<string>();
public async Task<ActionResult> Index()
{
 var tokenId = Request.QueryString["tokenId"];
 //如果tokenId不为空，则是由Service302过来的。
 if (tokenId != null)
 {
  using (HttpClient http = new HttpClient())
  {
   //验证Tokend是否有效
   var isValid = await http.GetStringAsync("http://localhost:8018/Home/TokenIdIsValid?tokenId=" + tokenId);
   if (bool.Parse(isValid.ToString()))
   {
    if (!Tokens.Contains(tokenId))
    {
     //记录登录过的Client (主要是为了可以统一登出)
     Tokens.Add(tokenId);
    }
    Session["token"] = tokenId;
   }
  }
 }
 //判断是否是登录状态
 if (Session["token"] == null || !Tokens.Contains(Session["token"].ToString()))
 {
  return Redirect("http://localhost:8018/Home/Verification?backUrl=http://localhost:26756/Home");
 }
 else
 {
  if (Session["token"] != null)
   Session["token"] = null;
 }
 return View();
}

public class Config
{  
 public static IEnumerable<IdentityResource> GetIdentityResources()
  {
   return new List<IdentityResource>
   {
    new IdentityResources.OpenId(),
    new IdentityResources.Profile(),
   };
  }
 public static IEnumerable<ApiResource> GetApiResources()
 {
  return new List<ApiResource>
  {
   new ApiResource("api1", "My API")
  };
 }
 // 可以访问的客户端
 public static IEnumerable<Client> GetClients()
  {   
   return new List<Client>
   {    
    // OpenID Connect hybrid flow and client credentials client (MVC)
    //Client1
    new Client
    {
     ClientId = "mvc1",
     ClientName = "MVC Client1",
     AllowedGrantTypes = GrantTypes.HybridAndClientCredentials,
     RequireConsent = true,
     ClientSecrets =
     {
      new Secret("secret".Sha256())
     },
     RedirectUris = { "http://localhost:5002/signin-oidc" }, //注意端口5002 是我们修改的Client的端口
     PostLogoutRedirectUris = { "http://localhost:5002/signout-callback-oidc" },
     AllowedScopes =
     {
      IdentityServerConstants.StandardScopes.OpenId,
      IdentityServerConstants.StandardScopes.Profile,
      "api1"
     },
     AllowOfflineAccess = true
    },
     //Client2
    new Client
    {
     ClientId = "mvc2",
     ClientName = "MVC Client2",
     AllowedGrantTypes = GrantTypes.HybridAndClientCredentials,
     RequireConsent = true,
     ClientSecrets =
     {
      new Secret("secret".Sha256())
     },
     RedirectUris = { "http://localhost:5003/signin-oidc" },
     PostLogoutRedirectUris = { "http://localhost:5003/signout-callback-oidc" },
     AllowedScopes =
     {
      IdentityServerConstants.StandardScopes.OpenId,
      IdentityServerConstants.StandardScopes.Profile,
      "api1"
     },
     AllowOfflineAccess = true
    }
   };
  }
}

public class ApplicationDbContext : IdentityDbContext<IdentityUser>
{
 public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
  : base(options)
 {
 } 
 protected override void OnModelCreating(ModelBuilder builder)
 {
  base.OnModelCreating(builder);
 }
}

"ConnectionStrings": {
 "DefaultConnection": "Server=(local);Database=IdentityServer4_Demo;Trusted_Connection=True;MultipleActiveResultSets=true"
 }

public void ConfigureServices(IServiceCollection services)
{
 services.AddDbContext<ApplicationDbContext>(options =>
  options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection"))); //数据库连接字符串
 services.AddIdentity<IdentityUser, IdentityRole>()
  .AddEntityFrameworkStores<ApplicationDbContext>()
  .AddDefaultTokenProviders();
 services.AddMvc();
 string connectionString = Configuration.GetConnectionString("DefaultConnection");
 var migrationsAssembly = typeof(Startup).GetTypeInfo().Assembly.GetName().Name;
 services.AddIdentityServer()
  .AddDeveloperSigningCredential()
  .AddAspNetIdentity<IdentityUser>() 
  .AddConfigurationStore(options =>
  {
   options.ConfigureDbContext = builder =>
    builder.UseSqlServer(connectionString,
     sql => sql.MigrationsAssembly(migrationsAssembly));
  })
  .AddOperationalStore(options =>
  {
   options.ConfigureDbContext = builder =>
    builder.UseSqlServer(connectionString,
     sql => sql.MigrationsAssembly(migrationsAssembly));
   options.EnableTokenCleanup = true;
   options.TokenCleanupInterval = 30;
  });
}

/// <summary>
/// 初始数据库
/// </summary>
/// <param name="app"></param>
private void InitializeDatabase(IApplicationBuilder app)
{
 using (var serviceScope = app.ApplicationServices.GetService<IServiceScopeFactory>().CreateScope())
 {
  serviceScope.ServiceProvider.GetRequiredService<ApplicationDbContext>().Database.Migrate();//执行数据库迁移
  serviceScope.ServiceProvider.GetRequiredService<PersistedGrantDbContext>().Database.Migrate();
  var context = serviceScope.ServiceProvider.GetRequiredService<ConfigurationDbContext>();
  context.Database.Migrate();
  if (!context.Clients.Any())
  {
   foreach (var client in Config.GetClients())//循环添加 我们直接添加的 5002、5003 客户端
   {
    context.Clients.Add(client.ToEntity());
   }
   context.SaveChanges();
  } 
  if (!context.IdentityResources.Any())
    {
     foreach (var resource in Config.GetIdentityResources())
     {
      context.IdentityResources.Add(resource.ToEntity());
     }
     context.SaveChanges();
    } 
  if (!context.ApiResources.Any())
    {
     foreach (var resource in Config.GetApiResources())
     {
      context.ApiResources.Add(resource.ToEntity());
     }
     context.SaveChanges();
    }
 }
}

 public void Configure(IApplicationBuilder app, IHostingEnvironment env)
 {
  //初始化数据
  InitializeDatabase(app);
  if (env.IsDevelopment())
  {
   app.UseDeveloperExceptionPage();
   app.UseBrowserLink();
   app.UseDatabaseErrorPage();
  }
  else
  {
   app.UseExceptionHandler("/Home/Error");
  }
  app.UseStaticFiles();
  app.UseIdentityServer();
  app.UseMvc(routes =>
  {
   routes.MapRoute(
    name: "default",
    template: "{controller=Home}/{action=Index}/{id?}");
  });
 }

public void ConfigureServices(IServiceCollection services)
{
 services.AddMvc();
 JwtSecurityTokenHandler.DefaultInboundClaimTypeMap.Clear();
 services.AddAuthentication(options =>
 {
  options.DefaultScheme = "Cookies";
  options.DefaultChallengeScheme = "oidc";
 }).AddCookie("Cookies").AddOpenIdConnect("oidc", options =>
 {
  options.SignInScheme = "Cookies";
  options.Authority = "http://localhost:5001";
  options.RequireHttpsMetadata = false;
  options.ClientId = "mvc2";
  options.ClientSecret = "secret";
  options.ResponseType = "code id_token";
  options.SaveTokens = true;
  options.GetClaimsFromUserInfoEndpoint = true;
  options.Scope.Add("api1");
  options.Scope.Add("offline_access");
 });
}

[Authorize]//身份认证
public IActionResult Index()
{
 return View();
}

/// <summary>
/// 登出
/// </summary>
/// <returns></returns>
public async Task<IActionResult> Logout()
{
 await HttpContext.SignOutAsync("Cookies");
 await HttpContext.SignOutAsync("oidc");
 return View("Index");
}