DotNetOpenAuth实践之WebApi资源服务器

系列目录：

DotNetOpenAuth实践系列（源码在这里）

上篇我们讲到WCF服务作为资源服务器接口提供数据服务，那么这篇我们介绍WebApi作为资源服务器，下面开始：

一、环境搭建

1、新建WebAPI项目

2、利用Nuget添加DotNetOpenAuth

注意：

Nuget里面的 NotNetOpenAuth 5.0. alpha3有bug，要到github(DotNetOpenAuth)里面下源码自己编译，用编译的dll替换掉Nuget引用的dll

3、把上次制作的证书文件拷贝的项目中

二、关键代码编写

1、公共代码

ResourceServerConfiguration

 using System.Security.Cryptography.X509Certificates;

 namespace WebApiResourcesServer.Code
 {
     public class ResourceServerConfiguration
     {
         public X509Certificate2 EncryptionCertificate { get; set; }
         public X509Certificate2 SigningCertificate { get; set; }
     }
 }

Common.cs

 namespace WebApiResourcesServer.Code
 {
     public class Common
     {
         public static ResourceServerConfiguration Configuration = new ResourceServerConfiguration();
     }
 }

Global.cs

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Security.Cryptography.X509Certificates;
 using System.Web;
 using System.Web.Http;
 using System.Web.Mvc;
 using System.Web.Optimization;
 using System.Web.Routing;
 using WebApiResourcesServer.Code;

 namespace WebApiResourcesServer
 {
     public class WebApiApplication : System.Web.HttpApplication
     {
         protected void Application_Start()
         {
             Common.Configuration = new ResourceServerConfiguration
             {
                 EncryptionCertificate = new X509Certificate2(Server.MapPath("~/Certs/idefav.pfx"), "a"),
                 SigningCertificate = new X509Certificate2(Server.MapPath("~/Certs/idefav.cer"))
             };
             AreaRegistration.RegisterAllAreas();
             GlobalConfiguration.Configure(WebApiConfig.Register);
             FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
             RouteConfig.RegisterRoutes(RouteTable.Routes);
             BundleConfig.RegisterBundles(BundleTable.Bundles);
         }
     }
 }

注意：

这里有个地方要注意，就是认证服务器上面用公钥加密，在资源服务器要用私钥解密，所以ResourceServeConfiguration里面传进去的证书是和认证服务器里面的是对调的

2、重写DelegatingHandler

 using DotNetOpenAuth.OAuth2;
 using System;
 using System.Net.Http;
 using System.Security.Cryptography;
 using System.Security.Principal;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Web;

 namespace WebApiResourcesServer.Code
 {
     public class OAuth2Handler : DelegatingHandler
     {
         private static async Task<IPrincipal> VerifyOAuth2(HttpRequestMessage httpDetails, params string[] requiredScopes)
         {
             // for this sample where the auth server and resource server are the same site,
             // we use the same public/private key.
             var resourceServer = new ResourceServer(new StandardAccessTokenAnalyzer((RSACryptoServiceProvider)Common.Configuration.SigningCertificate.PublicKey.Key, (RSACryptoServiceProvider)Common.Configuration.EncryptionCertificate.PrivateKey));
             return await resourceServer.GetPrincipalAsync(httpDetails, requiredScopes: requiredScopes);
         }

         protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
         {
             if (request.Headers.Authorization != null && request.Headers.Authorization.Scheme == "Bearer")
             {

                 var principal =VerifyOAuth2(request);

                 if (principal.Result != null)
                 {
                     HttpContext.Current.User = principal.Result;
                     Thread.CurrentPrincipal = principal.Result;
                 }

             }

             return base.SendAsync(request, cancellationToken);
         }

     }
 }

3、App_Start/WebApiConfig.cs里面添加OAuthHandler

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web.Http;
 using WebApiResourcesServer.Code;

 namespace WebApiResourcesServer
 {
     public static class WebApiConfig
     {
         public static void Register(HttpConfiguration config)
         {
             // Web API 配置和服务
             config.MessageHandlers.Add(new OAuth2Handler());
             // Web API 路由
             config.MapHttpAttributeRoutes();

             config.Routes.MapHttpRoute(
                 name: "DefaultApi",
                 routeTemplate: "api/{controller}/{id}",
                 defaults: new { id = RouteParameter.Optional }
             );
         }
     }
 }

4、设置要验证的接口

三、测试

打开解决方案属性，设置启动项目，启动认证服务器和WebApi资源服务器

利用Post工具访问认证服务器获取access_token

本次获取的Token的有效期为5分钟，超过5分钟要重新获取

用access_token范围WebAPI接口

我们手动改一下Token

下篇我们看一下Webform的ashx做的接口如何做资源服务器实现Authorization