prs/prs.server/Engines/GPS/SigfoxListener.cs

using Comal.Classes;
using GenHTTP.Api.Content;
using GenHTTP.Api.Infrastructure;
using GenHTTP.Api.Protocol;
using GenHTTP.Engine;
using GenHTTP.Modules.Practices;
using InABox.Clients;
using InABox.Core;
using Microsoft.Exchange.WebServices.Data;
using Syncfusion.DocIO.DLS;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;
using RequestMethod = GenHTTP.Api.Protocol.RequestMethod;

namespace PRSServer.Engines
{
    class SigfoxHandlerProperties
    {
        public ConcurrentDictionary<string, Device> Devices;

        public GPSUpdateQueue Queue;

        public SigfoxHandlerProperties(ConcurrentDictionary<string, Device> devices, GPSUpdateQueue queue)
        {
            Devices = devices;
            Queue = queue;
        }
    }


    public class SigfoxRequest
    {
        public string DeviceID { get; set; }

        public string MessageID { get; set; }

        public long TimeStamp { get; set; }

        public string Payload { get; set; }
    }

    class SigfoxHandler : Handler<SigfoxHandlerProperties>
    {
        private ConcurrentDictionary<string, Device> Devices;

        private GPSUpdateQueue Queue;

        private IResponseBuilder HandleSigfox(IRequest request)
        {
            if(request.Content == null) return request.Respond().Status(ResponseStatus.BadRequest);
            var sigfoxRequest = Serialization.Deserialize<SigfoxRequest>(request.Content);

            var location = new GPSTrackerLocation();

            SigfoxBase sigfox;
            try
            {
                sigfox = SigfoxFactory.Parse(sigfoxRequest.Payload);
            }
            catch (Exception e)
            {
                Logger.Send(LogType.Information, "", CoreUtils.FormatException(e));
                return request.Respond().Status(ResponseStatus.BadRequest);
            }
            if (sigfox is not SigfoxLocation sigfoxLocation)
            {
                Logger.Send(LogType.Information, "",
                    string.Format("- Skipping {0} ({1})", sigfox.GetType().EntityName().Split('.').Last(), sigfoxRequest.Payload));
                return request.Respond().Status(ResponseStatus.BadRequest);
            }

            var device = Devices[sigfoxRequest.DeviceID];

            location.DeviceID = sigfoxRequest.DeviceID;

            location.Location.Latitude = sigfoxLocation.Latitude;
            location.Location.Longitude = sigfoxLocation.Longitude;

            // Incoming TimeStamp is in UTC - need to add local offset 
            location.Location.Timestamp = sigfoxRequest.TimeStamp > 0
                ? new DateTime(1970, 1, 1).AddSeconds(sigfoxRequest.TimeStamp).Add(TimeZoneInfo.Local.GetUtcOffset(DateTime.UtcNow))
                : DateTime.Now;

            location.Speed = sigfoxLocation.Speed;

            location.BatteryLevel = device.CalculateBatteryLevel(sigfoxLocation.BatteryLevel); // sigfoxLocation.BatteryLevel / 5.25F * 100.0F
            location.InTrip = sigfoxLocation.InTrip;
            location.LastFixFailed = sigfoxLocation.LastFixFailed;

            Logger.Send(LogType.Information, "", $"Sigfox ({location.DeviceID}) Lat: {sigfoxLocation.Latitude}, Long: {sigfoxLocation.Longitude}");

            Queue.QueueUpdate("Updated by Sigfox Platform", location);

            return request.Respond().Status(ResponseStatus.OK);
        }

        private IResponseBuilder HandlePOST(IRequest request)
        {
            var endpoint = request.Target.GetRemaining();
            if (endpoint.Parts.Count == 0) return request.Respond().Status(ResponseStatus.NotFound);

            var endpointFirst = endpoint.Parts[0].Value;
            if (endpointFirst == "sigfox") return HandleSigfox(request);
            return request.Respond().Status(ResponseStatus.NotFound);
        }

        public override ValueTask<IResponse?> HandleAsync(IRequest request)
        {
            try
            {
                switch (request.Method.KnownMethod)
                {
                    case RequestMethod.POST:
                        return new ValueTask<IResponse?>(HandlePOST(request).Build());
                    default:
                        Logger.Send(LogType.Error, ClientFactory.UserID, $"Request method {request.Method.RawMethod} unknown");
                        return new ValueTask<IResponse?>(request.Respond().Status(ResponseStatus.MethodNotAllowed).Build());
                }
            }
            catch (Exception eListen)
            {
                Logger.Send(LogType.Error, ClientFactory.UserID, eListen.Message);
                return new ValueTask<IResponse?>(request.Respond().Status(ResponseStatus.InternalServerError).Build());
            }
        }

        public override void Init(SigfoxHandlerProperties properties)
        {
            Devices = properties.Devices;
            Queue = properties.Queue;
        }
    }

}