DotNetOpenAuth实践之WebApi资源服务器

系列目录：

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 5.0.0 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

 1 using System.Security.Cryptography.X509Certificates;
 2 
 3 namespace WebApiResourcesServer.Code
 4 {
 5     public class ResourceServerConfiguration
 6     {
 7         public X509Certificate2 EncryptionCertificate { get; set; }
 8         public X509Certificate2 SigningCertificate { get; set; }
 9     }
10 }

Common.cs

1 namespace WebApiResourcesServer.Code
2 {
3     public class Common
4     {
5         public static ResourceServerConfiguration Configuration = new ResourceServerConfiguration();
6     }
7 }

Global.cs

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Security.Cryptography.X509Certificates;
 5 using System.Web;
 6 using System.Web.Http;
 7 using System.Web.Mvc;
 8 using System.Web.Optimization;
 9 using System.Web.Routing;
10 using WebApiResourcesServer.Code;
11 
12 namespace WebApiResourcesServer
13 {
14     public class WebApiApplication : System.Web.HttpApplication
15     {
16         protected void Application_Start()
17         {
18             Common.Configuration = new ResourceServerConfiguration
19             {
20                 EncryptionCertificate = new X509Certificate2(Server.MapPath("~/Certs/idefav.pfx"), "a"),
21                 SigningCertificate = new X509Certificate2(Server.MapPath("~/Certs/idefav.cer"))
22             };
23             AreaRegistration.RegisterAllAreas();
24             GlobalConfiguration.Configure(WebApiConfig.Register);
25             FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
26             RouteConfig.RegisterRoutes(RouteTable.Routes);
27             BundleConfig.RegisterBundles(BundleTable.Bundles);
28         }
29     }
30 }

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

 1 using DotNetOpenAuth.OAuth2;
 2 using System;
 3 using System.Net.Http;
 4 using System.Security.Cryptography;
 5 using System.Security.Principal;
 6 using System.Threading;
 7 using System.Threading.Tasks;
 8 using System.Web;
 9 
10 namespace WebApiResourcesServer.Code
11 {
12     public class OAuth2Handler : DelegatingHandler
13     {
14         private static async Task<IPrincipal> VerifyOAuth2(HttpRequestMessage httpDetails, params string[] requiredScopes)
15         {
16             // for this sample where the auth server and resource server are the same site,
17             // we use the same public/private key.
18             var resourceServer = new ResourceServer(new StandardAccessTokenAnalyzer((RSACryptoServiceProvider)Common.Configuration.SigningCertificate.PublicKey.Key, (RSACryptoServiceProvider)Common.Configuration.EncryptionCertificate.PrivateKey));
19             return await resourceServer.GetPrincipalAsync(httpDetails, requiredScopes: requiredScopes);
20         }
21 
22         protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
23         {
24             if (request.Headers.Authorization != null && request.Headers.Authorization.Scheme == "Bearer")
25             {
26                 
27                 var principal =VerifyOAuth2(request);
28 
29                 if (principal.Result != null)
30                 {
31                     HttpContext.Current.User = principal.Result;
32                     Thread.CurrentPrincipal = principal.Result;
33                 }
34                
35                 
36             }
37 
38             return base.SendAsync(request, cancellationToken);
39         }
40 
41     }
42 }

3、App_Start/WebApiConfig.cs里面添加OAuthHandler

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web.Http;
 5 using WebApiResourcesServer.Code;
 6 
 7 namespace WebApiResourcesServer
 8 {
 9     public static class WebApiConfig
10     {
11         public static void Register(HttpConfiguration config)
12         {
13             // Web API 配置和服务
14             config.MessageHandlers.Add(new OAuth2Handler());
15             // Web API 路由
16             config.MapHttpAttributeRoutes();
17 
18             config.Routes.MapHttpRoute(
19                 name: "DefaultApi",
20                 routeTemplate: "api/{controller}/{id}",
21                 defaults: new { id = RouteParameter.Optional }
22             );
23         }
24     }
25 }