files tree made better.

src/Yavsc/AuthorizationServer/UserTokenProvider.cs

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+
+using System;
+using System.Threading.Tasks;
+using Microsoft.AspNet.DataProtection;
+using Microsoft.AspNet.Identity;
+using Yavsc.Models;
+
+namespace Yavsc.Auth  {
+
+    public class UserTokenProvider : Microsoft.AspNet.Identity.IUserTokenProvider<ApplicationUser>
+    {
+        private MonoDataProtector protector=null;
+        public MonoDataProtector Protector {
+            get { return protector; } 
+        }
+
+        public Task<bool> CanGenerateTwoFactorTokenAsync(UserManager<ApplicationUser> manager, ApplicationUser user)
+        {
+            return Task.FromResult(true);
+        }
+
+        public Task<string> GenerateAsync(string purpose, UserManager<ApplicationUser> manager, ApplicationUser user)
+        {
+            if ( user==null ) throw new InvalidOperationException("no user");
+            var por = new MonoDataProtector(Constants.ApplicationName,new string[] { purpose } );
+
+            return Task.FromResult(por.Protect(UserStamp(user)));
+        }
+
+        public Task<bool> ValidateAsync(string purpose, string token, UserManager<ApplicationUser> manager, ApplicationUser user)
+        {
+            var por = new MonoDataProtector(Constants.ApplicationName,new string[] { purpose } );
+            var userStamp = por.Unprotect(token);
+            Console.WriteLine ("Unprotected: "+userStamp);
+            string [] values = userStamp.Split(';');
+            return Task.FromResult ( user.Id == values[0] && user.Email == values[1] && user.UserName == values[2]);
+        }
+
+         public static string UserStamp(ApplicationUser user) {
+            return $"{user.Id};{user.Email};{user.UserName}";
+        }
+    }
+}