Remotely/Server/Services/RcImplementations/ViewerAuthorizer.cs

using Immense.RemoteControl.Server.Abstractions;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.Extensions.Caching.Memory;
using Remotely.Shared.Utilities;
using System;
using System.Threading.Tasks;

namespace Remotely.Server.Services.RcImplementations
{
    public class ViewerAuthorizer : IViewerAuthorizer
    {
        private readonly IApplicationConfig _appConfig;
        private readonly IOtpProvider _otpProvider;

        public ViewerAuthorizer(IApplicationConfig appConfig, IOtpProvider otpProvider)
        {
            _appConfig = appConfig;
            _otpProvider = otpProvider;
        }

        public string UnauthorizedRedirectUrl { get; } = "/Identity/Account/Login";

        public Task<bool> IsAuthorized(AuthorizationFilterContext context)
        {
            if (!_appConfig.RemoteControlRequiresAuthentication)
            {
                return Task.FromResult(true);
            }

            if (context.HttpContext.User.Identity?.IsAuthenticated == true)
            {
                return Task.FromResult(true);
            }

            if (context.HttpContext.Request.Query.TryGetValue("otp", out var otp) &&
                _otpProvider.Exists($"{otp}"))
            {
                return Task.FromResult(true);
            }

            return Task.FromResult(false);
        }
    }
}