Index: Src/GoogleApis.Auth/OAuth2/Responses/TokenResponse.cs
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+/*
+Copyright 2013 Google Inc
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+using System;
+
+using Google.Apis.Util;
+
+namespace Google.Apis.Auth.OAuth2.Responses
+{
+    /// <summary>
+    /// OAuth 2.0 model for a successful access token response as specified in 
+    /// http://tools.ietf.org/html/rfc6749#section-5.1.
+    /// </summary>
+    public class TokenResponse
+    {
+        /// <summary>Gets or sets the access token issued by the authorization server.</summary>
+        [Newtonsoft.Json.JsonPropertyAttribute("access_token")]
+        public string AccessToken { get; set; }
+
+        /// <summary>
+        /// Gets or sets the token type as specified in http://tools.ietf.org/html/rfc6749#section-7.1.
+        /// </summary>
+        [Newtonsoft.Json.JsonPropertyAttribute("token_type")]
+        public string TokenType { get; set; }
+
+        /// <summary>Gets or sets the lifetime in seconds of the access token.</summary>
+        [Newtonsoft.Json.JsonPropertyAttribute("expires_in")]
+        public Nullable<long> ExpiresInSeconds { get; set; }
+
+        /// <summary>
+        /// Gets or sets the refresh token which can be used to obtain a new access token.
+        /// For example, the value "3600" denotes that the access token will expire in one hour from the time the 
+        /// response was generated.
+        /// </summary>
+        [Newtonsoft.Json.JsonPropertyAttribute("refresh_token")]
+        public string RefreshToken { get; set; }
+
+        /// <summary>
+        /// Gets or sets the scope of the access token as specified in http://tools.ietf.org/html/rfc6749#section-3.3.
+        /// </summary>
+        [Newtonsoft.Json.JsonPropertyAttribute("scope")]
+        public string Scope { get; set; }
+
+        /// <summary>The date and time that this token was issued. <remarks>
+        /// It should be set by the CLIENT after the token was received from the server.
+        /// </remarks> 
+        /// </summary>
+        public DateTime Issued { get; set; }
+
+        /// <summary>
+        /// Returns <c>true</c> if the token is expired or it's going to be expired in the next minute.
+        /// </summary>
+        public bool IsExpired(IClock clock)
+        {
+            //TODO(peleyal): consider move it to an extension method
+            if (!ExpiresInSeconds.HasValue)
+            {
+                return true;
+            }
+
+            return Issued.AddSeconds(ExpiresInSeconds.Value + 60) <= clock.Now;
+        }
+
+        /// <summary>
+        /// Copies all properties from the other token, except the other's refresh token property in case it's null.
+        /// </summary>
+        internal void CopyFrom(TokenResponse other)
+        {
+            AccessToken = other.AccessToken;
+            TokenType = other.TokenType;
+            ExpiresInSeconds = other.ExpiresInSeconds;
+            if (other.RefreshToken != null)
+            {
+                RefreshToken = other.RefreshToken;
+            }
+            Scope = other.Scope;
+            Issued = other.Issued;
+        }
+    }
+}
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