//-----------------------------------------------------------------------
// <copyright file="AuthServerUtilities.cs" company="Outercurve Foundation">
//     Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------

namespace DotNetOpenAuth.OAuth2 {
	using System;
	using System.Collections.Generic;
	using System.Diagnostics.Contracts;
	using System.Linq;
	using System.Text;
	using DotNetOpenAuth.Messaging;

	/// <summary>
	/// Utility methods for authorization servers.
	/// </summary>
	internal static class AuthServerUtilities {
		/// <summary>
		/// Gets information about the client with a given identifier.
		/// </summary>
		/// <param name="authorizationServer">The authorization server.</param>
		/// <param name="clientIdentifier">The client identifier.</param>
		/// <returns>The client information.  Never null.</returns>
		internal static IClientDescription GetClientOrThrow(this IAuthorizationServer authorizationServer, string clientIdentifier) {
			Requires.NotNullOrEmpty(clientIdentifier, "clientIdentifier");
			Contract.Ensures(Contract.Result<IClientDescription>() != null);

			try {
				var result = authorizationServer.GetClient(clientIdentifier);
				ErrorUtilities.VerifyHost(result != null, OAuthStrings.ResultShouldNotBeNull, authorizationServer.GetType().FullName, "GetClient(string)");
				return result;
			} catch (KeyNotFoundException ex) {
				throw ErrorUtilities.Wrap(ex, OAuthStrings.ClientOrTokenSecretNotFound);
			} catch (ArgumentException ex) {
				throw ErrorUtilities.Wrap(ex, OAuthStrings.ClientOrTokenSecretNotFound);
			}
		}
	}
}