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POImplementation of two legged OAuth 2.0 for WebApi
 

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  1. POImplementation of two legged OAuth 2.0 for WebApi
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    <p>I created a mvc4 webapi project using VS2012RC. I tried to implement two legged Oauth 2 in my project. I followed the tutorial "http://community.codesmithtools.com/CodeSmith_Community/b/tdupont/archive/2011/03/18/oauth-2-0-for-mvc-two-legged-implementation.aspx", even though it is for mvc i am implementing it for web api. But isn't working </p> <p>I created a html page for my client side. When the html page load it executes an ajax function which is intended to return "access Token".</p> <pre><code> &lt;script type="text/javascript"&gt; $(document).ready(function () { var url = 'http://localhost:9792/api/Login'; $.get(url, function(data) { alert(data); }, "jsonp"); }); &lt;/script&gt; </code></pre> <p><strong>The server side code is,</strong></p> <pre><code>[NoCache] public class LoginController : ApiController { public LoginModelOAuth GetLogin() { var response = OAuthServiceBase.Instance.RequestToken(); LoginModelOAuth lmo = new LoginModelOAuth(); lmo.RequestToken = response.RequestToken; return lmo; } </code></pre> <p>}</p> <p><strong>RequestToken()</strong> method look like,</p> <pre><code> public override OAuthResponse RequestToken() { var token = Guid.NewGuid().ToString("N"); var expire = DateTime.Now.AddMinutes(5); RequestTokens.Add(token, expire); return new OAuthResponse { Expires = (int)expire.Subtract(DateTime.Now).TotalSeconds, RequestToken = token, RequireSsl = false, Success = true }; } </code></pre> <p><strong>LoginModelOAuth</strong> model look like,</p> <pre><code>public class LoginModelOAuth { public string RequestToken { get; set; } public string ErrorMessage { get; set; } public string ReturnUrl { get; set; } } </code></pre> <p>When i execute the client side code i receive following error </p> <pre><code>"500 Internal Server Error" </code></pre> <p>So i debugged server side code and in server side I got an error corresponding to this code </p> <p>"var response = OAuthServiceBase.Instance.RequestToken();" , and the error is</p> <pre><code> NullReferenceException was unhandled by user code "Object reference not set to an instance of an object." </code></pre> <p>My webconfig file look like,</p> <pre><code> &lt;configuration&gt; &lt;configSections&gt; &lt;section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" /&gt; &lt;section name="oauth" type="OAuth2.Mvc.Configuration.OAuthSection, OAuth2.Mvc, Version=1.0.0.0, Culture=neutral"/&gt; &lt;sectionGroup name="dotNetOpenAuth" type="DotNetOpenAuth.Configuration.DotNetOpenAuthSection, DotNetOpenAuth.Core"&gt; &lt;section name="messaging" type="DotNetOpenAuth.Configuration.MessagingElement, DotNetOpenAuth.Core" requirePermission="false" allowLocation="true" /&gt; &lt;section name="reporting" type="DotNetOpenAuth.Configuration.ReportingElement, DotNetOpenAuth.Core" requirePermission="false" allowLocation="true" /&gt; &lt;/sectionGroup&gt; &lt;/configSections&gt; &lt;oauth defaultProvider="DemoProvider" defaultService="DemoService"&gt; &lt;providers&gt; &lt;add name="DemoProvider" type="MillionNodesApi.OAuth.DemoProvider, MillionNodesApi" /&gt; &lt;/providers&gt; &lt;services&gt; &lt;add name="DemoService" type="MillionNodesApi.OAuth.DemoService, MillionNodesApi" /&gt; &lt;/services&gt; &lt;/oauth&gt; &lt;system.web&gt; &lt;httpModules&gt; &lt;add name="OAuthAuthentication" type="OAuth2.Mvc.Module.OAuthAuthenticationModule, OAuth2.Mvc, Version=1.0.0.0, Culture=neutral"/&gt; &lt;/httpModules&gt; &lt;compilation debug="true" targetFramework="4.0" /&gt; &lt;authentication mode="Forms"&gt; &lt;forms loginUrl="~/Account/Login" timeout="2880" /&gt; &lt;/authentication&gt; &lt;pages&gt; &lt;namespaces&gt; &lt;add namespace="System.Web.Helpers" /&gt; &lt;add namespace="System.Web.Mvc" /&gt; &lt;add namespace="System.Web.Mvc.Ajax" /&gt; &lt;add namespace="System.Web.Mvc.Html" /&gt; &lt;add namespace="System.Web.Optimization" /&gt; &lt;add namespace="System.Web.Routing" /&gt; &lt;add namespace="System.Web.WebPages" /&gt; &lt;/namespaces&gt; &lt;/pages&gt; &lt;/system.web&gt; &lt;dotNetOpenAuth&gt; &lt;messaging&gt; &lt;untrustedWebRequest&gt; &lt;whitelistHosts&gt; &lt;!-- Uncomment to enable communication with localhost (should generally not activate in production!) --&gt; &lt;!--&lt;add name="localhost" /&gt;--&gt; &lt;/whitelistHosts&gt; &lt;/untrustedWebRequest&gt; &lt;/messaging&gt; &lt;!-- Allow DotNetOpenAuth to publish usage statistics to library authors to improve the library. --&gt; &lt;reporting enabled="true" /&gt; </code></pre> <p> </p> <p>Will it work for web api?</p> <p>If not, please suggest me any tutorial that would help.</p> <p>Thanks.</p>
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