Endpoint authorization

Tokens are validated for some of the endpoints. Need to add other measures to rule out bogus tokens.

Models/Token.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Linq;
+
+using Newtonsoft.Json;
+
+
+namespace Icarus.Models
+{
+    public class Token
+    {
+        #region Properties
+        [JsonProperty("scope")]
+        public string Scope { get; set; }
+        [JsonProperty("exp")]
+        public int Expiration { get; set; }
+        [JsonProperty("aud")]
+        public string Audience { get; set; }
+        [JsonProperty("iss")]
+        public string Issuer { get; set; }
+        [JsonProperty("iat")]
+        public int Issued { get; set; }
+        #endregion
+    
+        #region Methods
+        public bool TokenExpired()
+        {
+            var result = false;
+            var currentDate = DateTime.Now;
+
+            var currentDateInSeconds = Math.Floor((currentDate - DateTime.UnixEpoch).TotalSeconds);
+
+            result = (currentDateInSeconds >= Expiration) ? true : false;
+
+            return result;
+        }
+
+        public bool ContainsScope(string desiredScope)
+        {
+            var result = false;
+            result = Scope.Contains(desiredScope);
+
+            return result;
+        }
+        #endregion
+    }
+}