FoxTube/FoxTube.Core/Helpers/UserControl.cs

using Google.Apis.Auth.OAuth2;
using Google.Apis.Oauth2.v2;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Windows.Security.Authentication.Web;
using YouTube.Authorization;
using YouTube;
using System.Text.RegularExpressions;
using Windows.Security.Credentials;
using FoxTube.Core.Models;
using System.Threading;
using Google.Apis.YouTube.v3;

namespace FoxTube
{
    public static class UserControl
    {
        static string[] Scopes { get; } = new string[]
        {
            Oauth2Service.Scope.UserinfoProfile,
            Oauth2Service.Scope.UserinfoEmail,
            YouTubeService.Scope.YoutubeForceSsl
        };

        static ClientSecrets ClientSecrets { get; } = new ClientSecrets
        {
            ClientId = "1096685398208-u95rcpkqb4e1ijfmb8jdq3jsg37l8igv.apps.googleusercontent.com",
            ClientSecret = "IU5bbdjwvmx8ttJoXQ7e6JWd"
        };

        public static User CurrentUser { get; set; }
        public static bool Authorized => CurrentUser != null;

        public static async Task<bool> AddUser()
        {
            Uri callbackUri = WebAuthenticationBroker.GetCurrentApplicationCallbackUri();
            Uri requestString = AuthorizationHelpers.FormQueryString(ClientSecrets, callbackUri, Scopes);

            WebAuthenticationResult result = await WebAuthenticationBroker.AuthenticateAsync(WebAuthenticationOptions.UseTitle, requestString, AuthorizationHelpers.Endpoint);
            switch(result.ResponseStatus)
            {
                case WebAuthenticationStatus.Success:
                    UserCredential credential = await AuthorizationHelpers.ExchangeToken(ClientSecrets, new Regex(@"(?<=code=).?\w+").Match(result.ResponseData).Value);   // TODO: Add credential assignment
                    CurrentUser = new User(credential);
                    return true;
                case WebAuthenticationStatus.UserCancel:
                    break;
                case WebAuthenticationStatus.ErrorHttp:
                    Metrics.AddEvent("Authorization failed (HTTP Error)", ("Response data", result.ResponseData), ("Error details", result.ResponseErrorDetail.ToString()));
                    break;
            }
            return false;
        }

        public static async Task Initialize()
        {
            PasswordVault passwordVault = new PasswordVault();
            List<PasswordCredential> credentials = passwordVault.FindAllByResource("foxtube").ToList();

            if (credentials.Count == 0)
                return;

            credentials[0].RetrievePassword();
            UserCredential credential = await AuthorizationHelpers.RestoreUser(ClientSecrets, credentials[0].Password);
            CurrentUser = new User(credential);
        }

        public static async Task Logout() =>
            await CurrentUser.Credential.RevokeTokenAsync(CancellationToken.None);
    }
}