Winify – Rev 49
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using System;
using System.Drawing;
using System.IO;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Newtonsoft.Json;
using Serilog;
using Servers;
using WebSocketSharp;
using Configuration = Configuration.Configuration;
using ErrorEventArgs = WebSocketSharp.ErrorEventArgs;
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;
private HttpClient _httpClient;
private readonly Uri _webSocketsUri;
private readonly Uri _httpUri;
private WebSocket _webSocketSharp;
private readonly global::Configuration.Configuration _configuration;
#endregion
#region Constructors, Destructors and Finalizers
private GotifyConnection()
{
}
public GotifyConnection(Server server, global::Configuration.Configuration configuration) : this()
{
_server = server;
_configuration = configuration;
var httpClientHandler = new HttpClientHandler();
_httpClient = new HttpClient(httpClientHandler);
if (_configuration.IgnoreSelfSignedCertificates)
{
httpClientHandler.ServerCertificateCustomValidationCallback =
(httpRequestMessage, cert, cetChain, policyErrors) => true;
}
_httpClient = new HttpClient(httpClientHandler);
if (!string.IsNullOrEmpty(_server.Username) && !string.IsNullOrEmpty(_server.Password))
{
_httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic",
Convert.ToBase64String(Encoding.Default.GetBytes($"{_server.Username}:{_server.Password}")));
}
if (!Uri.TryCreate(_server.Url, UriKind.Absolute, out _httpUri))
{
Log.Error($"No HTTP URL could be built out of the supplied server URI {_server.Url}.");
return;
}
// Build the web sockets URI.
var webSocketsUriBuilder = new UriBuilder(_httpUri);
switch (webSocketsUriBuilder.Scheme.ToUpperInvariant())
{
case "HTTP":
webSocketsUriBuilder.Scheme = "ws";
break;
case "HTTPS":
webSocketsUriBuilder.Scheme = "wss";
break;
}
try
{
webSocketsUriBuilder.Path = Path.Combine(webSocketsUriBuilder.Path, "stream");
}
catch (ArgumentException exception)
{
Log.Error($"No WebSockets URL could be built from the provided URL {_server.Url} due to {exception.Message}.");
}
_webSocketsUri = webSocketsUriBuilder.Uri;
}
public void Dispose()
{
if (_cancellationTokenSource != null)
{
_cancellationTokenSource.Dispose();
_cancellationTokenSource = null;
}
if (_webSocketSharp != null)
{
_webSocketSharp.Close();
_webSocketSharp = null;
}
if (_httpClient != null)
{
_httpClient.Dispose();
_httpClient = null;
}
}
#endregion
#region Public Methods
public void Start()
{
if (_webSocketsUri == null || _httpUri == null)
{
Log.Error("Could not start connection to server due to unreadable URLs.");
return;
}
_cancellationTokenSource = new CancellationTokenSource();
_cancellationToken = _cancellationTokenSource.Token;
Connect();
_runTask = Run(_cancellationToken);
}
private void Connect()
{
_webSocketSharp = new WebSocket(_webSocketsUri.AbsoluteUri);
if (!string.IsNullOrEmpty(_server.Username) && !string.IsNullOrEmpty(_server.Password))
{
_webSocketSharp.SetCredentials(_server.Username, _server.Password, true);
}
if (_configuration.IgnoreSelfSignedCertificates)
{
_webSocketSharp.SslConfiguration.ServerCertificateValidationCallback +=
(sender, certificate, chain, errors) => true;
}
_webSocketSharp.OnMessage += WebSocketSharp_OnMessage;
_webSocketSharp.OnError += WebSocketSharp_OnError;
_webSocketSharp.OnOpen += WebSocketSharp_OnOpen;
_webSocketSharp.OnClose += WebSocketSharp_OnClose;
_webSocketSharp.ConnectAsync();
}
private void WebSocketSharp_OnClose(object sender, CloseEventArgs e)
{
Log.Information($"WebSockets connection to server {_webSocketsUri.AbsoluteUri} closed with reason {e.Reason}.");
}
private void WebSocketSharp_OnOpen(object sender, EventArgs e)
{
Log.Information($"WebSockets connection to server {_webSocketsUri.AbsoluteUri} is now open.");
}
private async void WebSocketSharp_OnError(object sender, ErrorEventArgs e)
{
Log.Error($"Connection to WebSockets server {_webSocketsUri.AbsoluteUri} terminated unexpectedly with message {e.Message}.", e.Exception);
if (_cancellationToken.IsCancellationRequested)
{
Stop();
return;
}
await Task.Delay(TimeSpan.FromSeconds(1), _cancellationToken);
Log.Information($"Reconnecting to websocket server {_webSocketsUri.AbsoluteUri}.");
Connect();
}
private async void WebSocketSharp_OnMessage(object sender, MessageEventArgs e)
{
if (e.RawData.Length == 0)
{
Log.Warning($"Empty message received from server.");
return;
}
var message = Encoding.UTF8.GetString(e.RawData, 0, e.RawData.Length);
GotifyNotification gotifyNotification;
try
{
gotifyNotification = JsonConvert.DeserializeObject<GotifyNotification>(message);
}
catch (JsonSerializationException exception)
{
Log.Warning($"Could not deserialize notification: {exception.Message}");
return;
}
if (gotifyNotification == null)
{
Log.Warning($"Could not deserialize gotify notification: {message}");
return;
}
gotifyNotification.Server = _server;
if (!Uri.TryCreate(Path.Combine($"{_httpUri}", "application"), UriKind.Absolute,
out var applicationUri))
{
Log.Warning($"Could not build an URI to an application.");
return;
}
using (var imageStream =
await RetrieveGotifyApplicationImage(gotifyNotification.AppId, applicationUri, _cancellationToken))
{
if (imageStream == null)
{
Log.Warning("Could not find any application image for notification.");
return;
}
var image = Image.FromStream(imageStream);
GotifyNotification?.Invoke(this,
new GotifyNotificationEventArgs(gotifyNotification, image));
}
Log.Debug($"Notification message received: {gotifyNotification.Message}");
}
public void Stop()
{
if (_cancellationTokenSource != null) _cancellationTokenSource.Cancel();
}
#endregion
#region Private Methods
private async Task Run(CancellationToken cancellationToken)
{
try
{
do
{
await Task.Delay(TimeSpan.FromSeconds(1), cancellationToken);
} while (!cancellationToken.IsCancellationRequested);
}
catch (Exception exception) when (exception is OperationCanceledException || exception is ObjectDisposedException)
{
}
catch (Exception exception)
{
Log.Warning(exception, "Failure running connection loop.");
}
}
private async Task<Stream> RetrieveGotifyApplicationImage(int appId, Uri applicationUri,
CancellationToken cancellationToken)
{
var applicationResponse = await _httpClient.GetAsync(applicationUri, cancellationToken);
var applications = await applicationResponse.Content.ReadAsStringAsync();
GotifyApplication[] gotifyApplications;
try
{
gotifyApplications =
JsonConvert.DeserializeObject<GotifyApplication[]>(applications);
}
catch (JsonSerializationException exception)
{
Log.Warning($"Could not deserialize the list of applications from the server: {exception.Message}");
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))
{
Log.Warning("Could not build URL path to application icon.");
continue;
}
var imageResponse = await _httpClient.GetAsync(applicationImageUri, cancellationToken);
var memoryStream = new MemoryStream();
await imageResponse.Content.CopyToAsync(memoryStream);
return memoryStream;
}
return null;
}
#endregion
}
}
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