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PONullReferenceException on Bootstraptoken (ACS authentication)
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  1. PONullReferenceException on Bootstraptoken (ACS authentication)
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    copied!<p>I've been following the steps to make a Windows 8 Store app get an ACS token as described here: <a href="https://stackoverflow.com/questions/12485665/does-the-webauthenticationbroker-work-in-windows-8-metro-app-post-release-candid">Does the WebAuthenticationBroker work in Windows 8 Metro App post Release Candidate</a></p> <p><strong>Authentication method of Windows 8 client</strong></p> <pre><code>private async void Authenticate() { WebAuthenticationResult webAuthenticationResult = await WebAuthenticationBroker.AuthenticateAsync( WebAuthenticationOptions.None, new Uri("https://myACSnamespace.accesscontrol.windows.net:443/v2/wsfederation?wa=wsignin1.0&amp;wtrealm=http://localhost:12714/"), new Uri("http://mypublicIPaddress:80/WebAppMVCAPI/api/federation/end")); </code></pre> <p>My controller on the web application is programmed as follows:</p> <pre><code>public class FederationController : ApiController { protected virtual string ExtractBootstrapToken() { return HttpContext.Current.User.BootstrapToken(); } [HttpGet] public string Get() { return "Hello Get World"; } [HttpPost] public HttpResponseMessage Post() { var response = this.Request.CreateResponse(HttpStatusCode.Redirect); response.Headers.Add("Location", "/WebAppMVCAPI/api/federation/end?acsToken=" + ExtractBootstrapToken()); return response; } } </code></pre> <p>}</p> <p>The idea is to have the Windows 8 store app get a token from ACS with a Facebook login. When I launch the win8 client, the application shows a Facebook login page. However, the instruction <code>return HttpContext.Current.User.Bootstraptoken()</code> fails with the following exception:</p> <p><code>NullReferenceException. Object reference not set to an instance of an object.</code></p> <p>My web.config looks like this:</p> <pre><code> &lt;microsoft.identityModel&gt; &lt;service saveBootstrapTokens="true"&gt; &lt;audienceUris&gt; &lt;add value="http://localhost:80" /&gt; &lt;/audienceUris&gt; &lt;federatedAuthentication&gt; &lt;wsFederation passiveRedirectEnabled="true" issuer="https://bondsapp.accesscontrol.windows.net/v2/wsfederation" realm="http://localhost:80/" reply="http://localhost:80/" requireHttps="false" /&gt; &lt;cookieHandler requireSsl="false" path="/" /&gt; &lt;/federatedAuthentication&gt; &lt;issuerNameRegistry type="Microsoft.IdentityModel.Swt.SwtIssuerNameRegistry, Wif.Swt"&gt; &lt;trustedIssuers&gt; &lt;add name="https://bondsapp.accesscontrol.windows.net/" thumbprint="xxxxx" /&gt; &lt;/trustedIssuers&gt; &lt;/issuerNameRegistry&gt; &lt;securityTokenHandlers&gt; &lt;add type="Microsoft.IdentityModel.Swt.SwtSecurityTokenHandler, Wif.Swt" /&gt; &lt;/securityTokenHandlers&gt; &lt;issuerTokenResolver type="Microsoft.IdentityModel.Swt.SwtIssuerTokenResolver, Wif.Swt" /&gt; &lt;/service&gt; </code></pre> <p></p> <p>Can somebody shed some light on how to use the Bootstraptoken method to get an ACS token?</p> <p>Thanks Luis</p>
 

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