【7】.net WebAPI Owin OAuth 2.0 密码模式验证实例

1.OAuth密码模式

2.在VS中创建WebAPI项目

在nuget中安装：

Microsoft.AspNet.WebApi.Owin

Microsoft.Owin.Host.SystemWeb

这两个类库并添加Owin启动类Startup

using System;
using System.Threading.Tasks;
using Microsoft.Owin;
using Owin;
using Microsoft.Owin.Security.OAuth;

[assembly: OwinStartup(typeof(WebAPIOAuth.Startup))]

namespace WebAPIOAuth
{
public class Startup
{
public void Configuration(IAppBuilder app)
{
var OAuthOptions = new OAuthAuthorizationServerOptions
{
AllowInsecureHttp = true,
TokenEndpointPath = new PathString("/token"), //获取 access_token 授权服务请求地址
AuthorizeEndpointPath = new PathString("/authorize"), //获取 authorization_code 授权服务请求地址
AccessTokenExpireTimeSpan = TimeSpan.FromSeconds(10), //access_token 过期时间

Provider = new OpenAuthorizationServerProvider(), //access_token 相关授权服务
};

app.UseOAuthBearerTokens(OAuthOptions); //表示 token_type 使用 bearer 方式 不记名令牌验证
}
}
}

ConfigureOAuth(IAppBuilder app)方法开启了OAuth服务。简单说一下OAuthAuthorizationServerOptions中各参数的含义：

AllowInsecureHttp：允许客户端一http协议请求；

TokenEndpointPath：token请求的地址，即http://localhost:端口号/token；

AccessTokenExpireTim
4000
eSpan ：token过期时间；

Provider ：提供具体的认证策略；

3.继承授权服务OAuthAuthorizationServerProvider类

重载ValidateClientAuthentication方法验证客户端的正确性

重载GrantResourceOwnerCredentials方法实现用户名密码的验证，验证通过后会颁发token。

public class OpenAuthorizationServerProvider : OAuthAuthorizationServerProvider
{
/// <summary>
/// 验证调用端的clientid与clientSecret已验证调用端的合法性(clientid、clientSecret为约定好的字符串)。
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public override async Task ValidateClientAuthentication(OAuthValidateClientAuthenticationContext context)
{
string clientId;
string clientSecret;
context.TryGetBasicCredentials(out clientId, out clientSecret);
if (clientId == "1234" && clientSecret == "5678")
{
context.Validated(clientId);
}
await base.ValidateClientAuthentication(context);
}

/// <summary>
/// 通过重载GrantResourceOwnerCredentials获取用户名和密码进行认证
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public override async Task GrantResourceOwnerCredentials(OAuthGrantResourceOwnerCredentialsContext context)
{
//调用后台的登录服务验证用户名与密码
if (context.UserName != "Admin" || context.Password != "123456")
{
context.SetError("invalid_grant", "用户名或密码不正确。");
return;
}

var oAuthIdentity = new ClaimsIdentity(context.Options.AuthenticationType);
oAuthIdentity.AddClaim(new Claim(ClaimTypes.Name, context.UserName));
var ticket = new AuthenticationTicket(oAuthIdentity, new AuthenticationProperties());
context.Validated(ticket);

await base.GrantResourceOwnerCredentials(context);
}
}

在需要验证的方法处添加[Authorize]标签，当访问此接口时必须通过授权验证才可访问。

以上服务器端代码全部完成。

4.创建新的客户端项目进行测试

添加测试类

class OAuthClientTest
{
private HttpClient _httpClient;
private string token;

public OAuthClientTest()
{
_httpClient = new HttpClient();
_httpClient.BaseAddress = new Uri("http://localhost");
}

public async Task<string> GetAccessToken()
{
var clientId = "1234";
var clientSecret = "5678";

var parameters = new Dictionary<string, string>();
parameters.Add("grant_type", "password");
parameters.Add("username", "Admin");
parameters.Add("password", "123456");

_httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(
"Basic",
Convert.ToBase64String(Encoding.ASCII.GetBytes(clientId + ":" + clientSecret))
);

var response = await _httpClient.PostAsync("OAuthTest/token", new FormUrlEncodedContent(parameters));
var responseValue = await response.Content.ReadAsStringAsync();
if (response.StatusCode == System.Net.HttpStatusCode.OK)
{
return JObject.Parse(responseValue)["access_token"].Value<string>();
}
else
{
Console.WriteLine(responseValue);
return string.Empty;
}
}

public async Task Call_WebAPI_By_Resource_Owner_Password_Credentials_Grant()
{
if(string.IsNullOrEmpty(token))
token = await GetAccessToken();
Console.WriteLine(token);
_httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
Console.WriteLine(await (await _httpClient.GetAsync("OAuthTest/api/Values")).Content.ReadAsStringAsync());
}
}

main方法中调用进行测试：

static void Main(string[] args)
{
var clientTest = new OAuthClientTest();
var task = clientTest.Call_WebAPI_By_Resource_Owner_Password_Credentials_Grant();
task.Wait();
//var token = clientTest.GetAccessToken();
//var strToken = token.Result;
//Console.WriteLine(strToken);
Console.ReadLine();
}结果如下：



其中长串字符为token，"value1, value2"为访问webapi返回的结果，表明访问成功。

参考1：http://www.cnblogs.com/xishuai/p/aspnet-webapi-owin-oauth2.html

参考2：http://www.cnblogs.com/Leo_wl/p/4919783.html