I created an app by using the following tutorial:
http://www.luisevalencia.com/2014/07/23/prepare-environments-sharepoint-provider-hosted-apps/
The app works perfectly if there are no sharepoint calls, I meant a response.write with hello world works.
But, if I add some sharepoint stuff like printing out the name of the user, I got a The remote server returned an error: (401) Unauthorized.
Uri hostWeb = new Uri(Request.QueryString["SPHostUrl"]);
using (var clientContext = TokenHelper.GetS2SClientContextWithWindowsIdentity(hostWeb, Request.LogonUserIdentity))
{
clientContext.Load(clientContext.Web, web => web.Title);
clientContext.ExecuteQuery();
Response.Write(clientContext.Web.Title);
Response.Write("Hello World");
}
I get the following error on the logs.
SPApplicationAuthenticationModule: Failed to authenticate request, unknown error. Exception details: System.IdentityModel.Tokens.SecurityTokenException: The issuer of the token is not a trusted issuer.
at Microsoft.SharePoint.IdentityModel.SPTrustedIssuerNameRegistry`1.GetIssuerName(SecurityToken securityToken, String requestedIssuerName)
at Microsoft.SharePoint.IdentityModel.SPJsonWebSecurityBaseTokenHandler.GetIssuerNameFromIssuerToken(JsonWebSecurityToken token)
at Microsoft.SharePoint.IdentityModel.SPJsonWebSecurityBaseTokenHandler.GetIssuerName(JsonWebSecurityToken token)
at Microsoft.IdentityModel.S2S.Tokens.JsonWebSecurityTokenHandler.ValidateTokenCore(SecurityToken token, Boolean isActorToken)
at Microsoft.IdentityModel.S2S.Tokens.JsonWebSecurityTokenHandler.ValidateTokenCore(SecurityToken token, Boolean isActorToken)
at Microsoft.SharePoint.IdentityModel.SPJsonWebSecurityBaseTokenHandler.ValidateToken(SecurityToken token)
at Microsoft.SharePoint.IdentityModel.SPJsonWebSecurityTokenHandler.ValidateToken(SecurityToken token)
at Microsoft.SharePoint.IdentityModel.SPApplicationAuthenticationModule.TryExtractAndValidateToken(HttpContext httpContext, SPIncomingTokenContext& tokenContext)
at Microsoft.SharePoint.IdentityModel.SPApplicationAuthenticationModule.ConstructIClaimsPrincipalAndSetThreadIdentity(HttpApplication httpApplication, HttpContext httpContext, SPFederationAuthenticationModule fam)
at Microsoft.SharePoint.IdentityModel.SPApplicationAuthenticationModule.AuthenticateRequest(Object sender, EventArgs e)
