Deserialize vanilla openstack token with preconfigured jsonserializer

The default json.net serializer will helpfully reformat strings that appear
to be date time strings for you, even when the destination property is a string.
Use the preconfigured jsonserializer which has this disabled, to preserve
the expires string as-is.

Author: carolynvs

src/corelib/Core/Providers/OpenStackIdentityProvider.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using Newtonsoft.Json;
 using OpenStack;
 using OpenStack.Authentication;
 
@@ -109,11 +110,12 @@ public override UserAccess GetUserAccess(CloudIdentity identity, bool forceCache
                     if (response == null || response.Data == null)
                         return null;
 
-                    JToken userAccessObject = response.Data["access"];
-                    if (userAccessObject == null)
+                    // The defalut json serialization is helpfully formatting the expires date string. Use our custom serializer for this part to prevent chaos of timezone proportions.
+                    var rawJson = response.Data["access"]?.ToString(Formatting.None);
+                    if (rawJson == null)
                         return null;
 
-                    UserAccess access = userAccessObject.ToObject<UserAccess>();
+                    UserAccess access = OpenStackNet.Deserialize<UserAccess>(rawJson);
                     if (access == null || access.Token == null)
                         return null;
 

src/corelib/OpenStackNet.cs

@@ -89,6 +89,26 @@ public static void ResetDefaults()
             }
         }
 
+        /// <summary>
+        /// Deserializes an object from a json string representation.
+        /// </summary>
+        /// <typeparam name="T">The object type.</typeparam>
+        /// <param name="json">The json string.</param>
+        public static T Deserialize<T>(string json)
+        {
+            return Configuration.FlurlHttpSettings.JsonSerializer.Deserialize<T>(json);
+        }
+
+        /// <summary>
+        /// Serializes an object to a json string representation
+        /// </summary>
+        /// <param name="obj">The object.</param>
+        /// <returns>The json string representation of the object.</returns>
+        public static string Serialize(object obj)
+        {
+            return Configuration.FlurlHttpSettings.JsonSerializer.Serialize(obj);
+        }
+
         /// <summary>
         /// Provides global point for programmatically configuraing tracing
         /// </summary>