/*

* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.

* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.

*

* 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 Microsoft.VisualStudio.Shell;

using System;

namespace QuantConnect.VisualStudioPlugin

{

/// <summary>

/// Singleton that stores a reference to an authenticated Api instance

/// </summary>

internal class AuthorizationManager

{

/// <summary>

/// Authorization manager singleton instance

/// </summary>

private static readonly AuthorizationManager _authorizationManager = new AuthorizationManager();

private Api.Api _api;

/// <summary>

/// Get singleton authorization manager instance accessable from multiple commands

/// </summary>

/// <returns>singleton authorization instance</returns>

public static AuthorizationManager GetInstance()

{

return _authorizationManager;

}

/// <summary>

/// Get an authenticated API instance.

/// </summary>

/// <returns>Authenticated API instance</returns>

/// <exception cref="InvalidOperationException">API is not authenticated</exception>

public Api.Api GetApi()

{

if (_api == null)

{

VSActivityLog.Error("Accessing API without logging in first");

throw new InvalidOperationException("Accessing API without logging in first");

}

return _api;

}

/// <summary>

/// Check if the API is authenticated

/// </summary>

/// <returns>true if API is authenticated, false otherwise</returns>

public bool IsLoggedIn()

{

return _api != null;

}

/// <summary>

/// Authenticate API

/// </summary>

/// <param name="credentials">User id and access token to authenticate the API</param>

/// <returns>true if successfully authenticated API, false otherwise</returns>

public async System.Threading.Tasks.Task<bool> Login(Credentials credentials)

{

VSActivityLog.Info("Authenticating QuantConnect API");

try

{

var api = new Api.Api();

api.Initialize(int.Parse(credentials.UserId), credentials.AccessToken, Globals.DataFolder);

var apiConnected = await System.Threading.Tasks.Task.Run(() => api.Connected);

if (apiConnected)

{

_api = api;

return true;

}

}

catch (Exception exception)

{

VsUtils.ShowErrorMessageBox(ServiceProvider.GlobalProvider,

"QuantConnect Exception", exception.ToString());

}

return false;

}

/// <summary>

/// Logout the API

/// </summary>

public void Logout()

{

_api = null;

}

}

}