Index: Src/GoogleApis.Auth/OAuth2/Responses/AuthorizationCodeResponseUrl.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 System.Collections.Generic;
+
+namespace Google.Apis.Auth.OAuth2.Responses
+{
+    /// <summary>
+    /// Authorization Code response for the redirect URL after end user grants or denies authorization as specified 
+    /// in http://tools.ietf.org/html/rfc6749#section-4.1.2.
+    /// <para>
+    /// Check that <see cref="Code"/> is not <c>null</c> or empty to verify the end-user granted authorization.
+    /// </para>
+    /// </summary>
+    public class AuthorizationCodeResponseUrl
+    {
+        /// <summary>Gets or sets the authorization code generated by the authorization server.</summary>
+        public string Code { get; set; }
+
+        /// <summary>
+        /// Gets or sets the state parameter matching the state parameter in the authorization request.
+        /// </summary>
+        public string State { get; set; }
+
+        /// <summary>
+        /// Gets or sets the error code (e.g. "invalid_request", "unauthorized_client", "access_denied", 
+        /// "unsupported_response_type", "invalid_scope", "server_error", "temporarily_unavailable") as specified in 
+        /// http://tools.ietf.org/html/rfc6749#section-4.1.2.1.
+        /// </summary>
+        public string Error { get; set; }
+
+        /// <summary>
+        /// Gets or sets the human-readable text which provides additional information used to assist the client 
+        /// developer in understanding the error occurred.
+        /// </summary>
+        public string ErrorDescription { get; set; }
+
+        /// <summary>
+        /// Gets or sets the URI identifying a human-readable web page with provides information about the error.
+        /// </summary>
+        public string ErrorUri { get; set; }
+
+        /// <summary>Constructs a new authorization code response URL from the specified dictionary.</summary>
+        public AuthorizationCodeResponseUrl(IDictionary<string, string> queryString)
+        {
+            InitFromDictionary(queryString);
+        }
+
+        #region Constructs
+
+        /// <summary>Constructs a new authorization code response URL from the specified query string.</summary>
+        public AuthorizationCodeResponseUrl(string query)
+        {
+            var pairs = query.Split('&');
+            var queryString = new Dictionary<string, string>();
+            foreach (var pair in pairs)
+            {
+                var keyValue = pair.Split('=');
+                queryString[keyValue[0]] = keyValue[1];
+            }
+
+            InitFromDictionary(queryString);
+        }
+
+        /// <summary>Initializes this instance from the input dictionary.</summary>
+        private void InitFromDictionary(IDictionary<string, string> queryString)
+        {
+            //TODO(peleyal): improve the following code and make it a utility
+            IDictionary<string, Action<string>> setters = new Dictionary<string, Action<string>>();
+            setters["code"] = v => Code = v;
+            setters["state"] = v => State = v;
+            setters["error"] = v => Error = v;
+            setters["error_description"] = v => ErrorDescription = v;
+            setters["error_uri"] = v => ErrorUri = v;
+
+            Action<string> setter;
+            foreach (var pair in queryString)
+            {
+                if (setters.TryGetValue(pair.Key, out setter))
+                {
+                    setter(pair.Value);
+                }
+            }
+        }
+
+        /// <summary>Constructs a new empty authorization code response URL.</summary>
+        public AuthorizationCodeResponseUrl()
+        {
+        }
+
+        #endregion
+    }
+}