/Source/facebook.Linq/Web/FacebookConfiguration.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Configuration;



namespace facebook.Web

{

	/// <summary>

	/// Configures the Facebook API

	/// </summary>

	class FacebookConfiguration

	{

		static FacebookConfiguration _Current;

		static object _Entrance = new object();

		public static FacebookConfiguration Current

		{

			get

			{

				if (_Current == null)

				{

					lock (_Entrance)

					{

						if (_Current == null)

						{

							_Current = new FacebookConfiguration();

							_Current.Load(ConfigurationManager.AppSettings);

						}

					}

				}

				return _Current;

			}

		}



		private void Load(System.Collections.Specialized.NameValueCollection settings)

		{

			APIKey = settings["facebook.Linq.APIKey"];

			Secret = settings["facebook.Linq.Secret"];

			ApplicationID = settings["facebook.Linq.ApplicationID"];

			UseTesterKey = settings["facebook.Linq.UseTesterKey"] == "true";

			DefaultPage = settings["facebook.Linq.DefaultPage"];

			Validate();

		}







		/// <summary>

		/// Facebook API Application Key (Length should be 32 chars)

		/// </summary>

		public string APIKey { get; set; }



		/// <summary>

		/// Facebook API Application Secret (Length should be 32 chars)

		/// </summary>

		public string Secret { get; set; }



		/// <summary>

		/// Facebook Application ID

		/// </summary>

		public string ApplicationID { get; set; }



		/// <summary>

		/// When set, the Facebook Application Tester application will be used. If you don't have a facebook application of your own, turn this on

		/// </summary>

		public bool UseTesterKey { get; set; }



		/// <summary>

		/// Default facebook entrance page that will be displayed when the user browses to the application

		/// </summary>		

		public string DefaultPage { get; set; }



		#region IValidatableConfiguration Members



		public void Validate()

		{

			if (UseTesterKey)

			{

				APIKey = "56776198fcd674ec896ad3d76bdde346";

				Secret = "f5983f1fd433d6d64f8f3317e57cd528";

				ApplicationID = "39301909849";

			}

			else

			{

				if (APIKey.IsNullOrEmpty() || APIKey.Length != 32)

					throw new Exception("Bad or missing Facebook facebook.Linq.APIKey");

				if (Secret.IsNullOrEmpty() || Secret.Length != 32)

					throw new Exception("Bad or missing Facebook facebook.Linq.Secret");

				if (ApplicationID.IsNullOrEmpty())

					throw new Exception("Missing Facebook facebook.Linq.ApplicationID");

			}

		}



		#endregion

	}

}