Winify – Rev 35
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using System;
using System.Drawing;
using System.IO;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Net.WebSockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Newtonsoft.Json;
using Serilog;
using Servers;
using ClientWebSocket = System.Net.WebSockets.Managed.ClientWebSocket;
namespace Winify.Gotify
{
public class GotifyConnection : IDisposable
{
#region Public Events & Delegates
public event EventHandler<GotifyNotificationEventArgs> GotifyNotification;
#endregion
#region Private Delegates, Events, Enums, Properties, Indexers and Fields
private readonly Server _server;
private CancellationToken _cancellationToken;
private CancellationTokenSource _cancellationTokenSource;
private Task _runTask;
#endregion
#region Constructors, Destructors and Finalizers
public GotifyConnection(Server server)
{
_server = server;
}
public void Dispose()
{
if (_cancellationTokenSource != null)
{
_cancellationTokenSource.Dispose();
_cancellationTokenSource = null;
}
}
#endregion
#region Public Methods
public void Start()
{
if (!Uri.TryCreate(_server.Url, UriKind.Absolute, out var httpUri)) return;
// Build the web sockets URI.
var webSocketsUriBuilder = new UriBuilder(httpUri);
webSocketsUriBuilder.Scheme = "ws";
webSocketsUriBuilder.Path = Path.Combine($"{webSocketsUriBuilder.Path}", "stream");
var webSocketsUri = webSocketsUriBuilder.Uri;
_cancellationTokenSource = new CancellationTokenSource();
_cancellationToken = _cancellationTokenSource.Token;
_runTask = Run(webSocketsUri, httpUri, _server.Username, _server.Password, _cancellationToken);
}
public void Stop()
{
if (_cancellationTokenSource != null) _cancellationTokenSource.Cancel();
}
#endregion
#region Private Methods
private async Task Run(Uri webSocketsUri, Uri httpUri, string username, string password,
CancellationToken cancellationToken)
{
try
{
do
{
try
{
using (var webSocketClient = new ClientWebSocket())
{
var auth = Convert.ToBase64String(Encoding.Default.GetBytes($"{username}:{password}"));
webSocketClient.Options.SetRequestHeader("Authorization", $"Basic {auth}");
await webSocketClient.ConnectAsync(webSocketsUri, cancellationToken);
do
{
var payload = new ArraySegment<byte>(new byte[1024]);
var result = await webSocketClient.ReceiveAsync(payload, cancellationToken);
if (result.Count == 0) continue;
if (payload.Array == null || payload.Count == 0) continue;
var message = Encoding.UTF8.GetString(payload.Array, 0, payload.Count);
var gotifyNotification = JsonConvert.DeserializeObject<GotifyNotification>(message);
if (gotifyNotification == null)
{
Log.Warning($"Could not deserialize gotify notification: {message}");
continue;
}
gotifyNotification.Server = _server;
if (!Uri.TryCreate(Path.Combine($"{httpUri}", "application"), UriKind.Absolute,
out var applicationUri))
{
continue;
}
var image = await RetrieveGotifyApplicationImage(gotifyNotification.AppId, httpUri,
applicationUri, auth, cancellationToken);
GotifyNotification?.Invoke(this,
new GotifyNotificationEventArgs(gotifyNotification, image));
Log.Debug($"Notification message received: {gotifyNotification.Message}");
} while (!cancellationToken.IsCancellationRequested);
}
}
catch (Exception ex) when (ex is WebSocketException || ex is HttpRequestException)
{
// Reconnect
Log.Warning($"Unable to connect to gotify server: {ex.Message}");
await Task.Delay(TimeSpan.FromSeconds(1), cancellationToken);
}
} while (!cancellationToken.IsCancellationRequested);
}
catch (Exception ex) when (ex is OperationCanceledException || ex is ObjectDisposedException)
{
}
catch (Exception ex)
{
Log.Warning(ex, "Failure running connection loop.");
}
}
private static async Task<Image> RetrieveGotifyApplicationImage(int appId, Uri httpUri, Uri applicationUri,
string auth,
CancellationToken cancellationToken)
{
using (var httpClient = new HttpClient())
{
httpClient.DefaultRequestHeaders.Authorization =
new AuthenticationHeaderValue("Basic", auth);
var applicationResponse = await httpClient.GetAsync(applicationUri, cancellationToken);
var applications = await applicationResponse.Content.ReadAsStringAsync();
var gotifyApplications =
JsonConvert.DeserializeObject<GotifyApplication[]>(applications);
if (gotifyApplications == null) return null;
foreach (var application in gotifyApplications)
{
if (application.Id != appId) continue;
if (!Uri.TryCreate(Path.Combine($"{httpUri}", $"{application.Image}"), UriKind.Absolute,
out var applicationImageUri))
continue;
var imageResponse = await httpClient.GetAsync(applicationImageUri, cancellationToken);
using (var memoryStream = new MemoryStream())
{
await imageResponse.Content.CopyToAsync(memoryStream);
return Image.FromStream(memoryStream);
}
}
}
return null;
}
#endregion
}
}
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