c# – 如何在Asp.net MVC中编写OAuth2 Web API客户端

我想编写一个将使用API??的基于Web的(Asp.net MVC 5)客户端.是否有可以下载的nuget软件包可以帮助我实现客户端OAuth2流程？任何人都可以指导我在客户端实现OAuth2流程的一个很好的例子(用asp.net MVC编写)？

更新
我能够使用下面的代码块获取访问令牌,但是我想要的是一个“客户端凭据”oauth 2流程,我不必输入登录名和密码.我现在的代码是：

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        app.SetDefaultSignInAsAuthenticationType("ClientCookie");

        app.UseCookieAuthentication(new CookieAuthenticationOptions
        {
            AuthenticationMode = AuthenticationMode.Active,AuthenticationType = "ClientCookie",CookieName = CookieAuthenticationDefaults.CookiePrefix + "ClientCookie",ExpireTimeSpan = TimeSpan.FromMinutes(5)
        });

        app.USEOpenIdConnectAuthentication(new OpenIdConnectAuthenticationOptions
        {
            AuthenticationMode = AuthenticationMode.Active,AuthenticationType = OpenIdConnectAuthenticationDefaults.AuthenticationType,SignInAsAuthenticationType = app.GetDefaultSignInAsAuthenticationType(),ClientId = ConfigurationManager.AppSettings["AuthServer:ClientId"],ClientSecret = ConfigurationManager.AppSettings["AuthServer:ClientSecret"],RedirectUri = ConfigurationManager.AppSettings["AuthServer:RedirectUrl"],Configuration = new OpenIdConnectConfiguration
            {
                AuthorizationEndpoint = "https://identityserver.com/oauth2/authorize",TokenEndpoint = "https://identityserver.com/oauth2/token"                                        
            },//ResponseType = "client_credentials",// Doesn't work
            ResponseType = "token",Notifications = new OpenIdConnectAuthenticationNotifications
            {
                AuthenticationFailed = notification =>
                {
                    if (string.Equals(notification.ProtocolMessage.Error,"access_denied",StringComparison.Ordinal))
                    {
                        notification.HandleResponse();

                        notification.Response.Redirect("/");
                    }

                    return Task.FromResult<object>(null);
                },AuthorizationCodeReceived = async notification =>
                {
                    using (var client = new HttpClient())
                    {
                        //var configuration = await notification.Options.ConfigurationManager.GetConfigurationAsync(notification.Request.CallCancelled);
                        String tokenEndPoint = "https://identityserver.com/oauth2/token";

                        //var request = new HttpRequestMessage(HttpMethod.Post,configuration.TokenEndpoint);
                        var request = new HttpRequestMessage(HttpMethod.Post,tokenEndPoint);
                        request.Content = new FormUrlEncodedContent(new Dictionary<string,string> {
                            { OpenIdConnectParameterNames.ClientId,notification.Options.ClientId },{ OpenIdConnectParameterNames.ClientSecret,notification.Options.ClientSecret },{ OpenIdConnectParameterNames.Code,notification.ProtocolMessage.Code },{ OpenIdConnectParameterNames.GrantType,"authorization_code" },{ OpenIdConnectParameterNames.RedirectUri,notification.Options.RedirectUri }
                        });

                        var response = await client.SendAsync(request,notification.Request.CallCancelled);
                        response.EnsureSuccessStatusCode();

                        var payload = JObject.Parse(await response.Content.ReadAsStringAsync());

                        // Add the access token to the returned ClaimsIdentity to make it easier to retrieve.
                        notification.AuthenticationTicket.Identity.AddClaim(new Claim(
                            type: OpenIdConnectParameterNames.AccessToken,value: payload.Value<string>(OpenIdConnectParameterNames.AccessToken)));
                    }
                }
            }
        });


    }
}