Enable nullable reference types for Emby.Photos and Emby.Notifications

* Enable TreatWarningsAsErrors for Emby.Notifications
* Add analyzers to Emby.Notifications

Emby.Notifications/NotificationEntryPoint.cs

@@ -0,0 +1,326 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using MediaBrowser.Common.Configuration;
+using MediaBrowser.Controller;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Entities.Audio;
+using MediaBrowser.Controller.Entities.TV;
+using MediaBrowser.Controller.Library;
+using MediaBrowser.Controller.Notifications;
+using MediaBrowser.Controller.Plugins;
+using MediaBrowser.Model.Activity;
+using MediaBrowser.Model.Events;
+using MediaBrowser.Model.Globalization;
+using MediaBrowser.Model.Notifications;
+using Microsoft.Extensions.Logging;
+
+namespace Emby.Notifications
+{
+    /// <summary>
+    /// Creates notifications for various system events.
+    /// </summary>
+    public class NotificationEntryPoint : IServerEntryPoint
+    {
+        private readonly ILogger _logger;
+        private readonly IActivityManager _activityManager;
+        private readonly ILocalizationManager _localization;
+        private readonly INotificationManager _notificationManager;
+        private readonly ILibraryManager _libraryManager;
+        private readonly IServerApplicationHost _appHost;
+        private readonly IConfigurationManager _config;
+
+        private readonly object _libraryChangedSyncLock = new object();
+        private readonly List<BaseItem> _itemsAdded = new List<BaseItem>();
+
+        private Timer? _libraryUpdateTimer;
+
+        private string[] _coreNotificationTypes;
+
+        private bool _disposed = false;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="NotificationEntryPoint" /> class.
+        /// </summary>
+        /// <param name="logger">The logger.</param>
+        /// <param name="activityManager">The activity manager.</param>
+        /// <param name="localization">The localization manager.</param>
+        /// <param name="notificationManager">The notification manager.</param>
+        /// <param name="libraryManager">The library manager.</param>
+        /// <param name="appHost">The application host.</param>
+        /// <param name="config">The configuration manager.</param>
+        public NotificationEntryPoint(
+            ILogger<NotificationEntryPoint> logger,
+            IActivityManager activityManager,
+            ILocalizationManager localization,
+            INotificationManager notificationManager,
+            ILibraryManager libraryManager,
+            IServerApplicationHost appHost,
+            IConfigurationManager config)
+        {
+            _logger = logger;
+            _activityManager = activityManager;
+            _localization = localization;
+            _notificationManager = notificationManager;
+            _libraryManager = libraryManager;
+            _appHost = appHost;
+            _config = config;
+
+            _coreNotificationTypes = new CoreNotificationTypes(localization).GetNotificationTypes().Select(i => i.Type).ToArray();
+        }
+
+        /// <inheritdoc />
+        public Task RunAsync()
+        {
+            _libraryManager.ItemAdded += OnLibraryManagerItemAdded;
+            _appHost.HasPendingRestartChanged += OnAppHostHasPendingRestartChanged;
+            _appHost.HasUpdateAvailableChanged += OnAppHostHasUpdateAvailableChanged;
+            _activityManager.EntryCreated += OnActivityManagerEntryCreated;
+
+            return Task.CompletedTask;
+        }
+
+        private async void OnAppHostHasPendingRestartChanged(object sender, EventArgs e)
+        {
+            var type = NotificationType.ServerRestartRequired.ToString();
+
+            var notification = new NotificationRequest
+            {
+                NotificationType = type,
+                Name = string.Format(
+                    CultureInfo.InvariantCulture,
+                    _localization.GetLocalizedString("ServerNameNeedsToBeRestarted"),
+                    _appHost.Name)
+            };
+
+            await SendNotification(notification, null).ConfigureAwait(false);
+        }
+
+        private async void OnActivityManagerEntryCreated(object sender, GenericEventArgs<ActivityLogEntry> e)
+        {
+            var entry = e.Argument;
+
+            var type = entry.Type;
+
+            if (string.IsNullOrEmpty(type) || !_coreNotificationTypes.Contains(type, StringComparer.OrdinalIgnoreCase))
+            {
+                return;
+            }
+
+            var userId = e.Argument.UserId;
+
+            if (!userId.Equals(Guid.Empty) && !GetOptions().IsEnabledToMonitorUser(type, userId))
+            {
+                return;
+            }
+
+            var notification = new NotificationRequest
+            {
+                NotificationType = type,
+                Name = entry.Name,
+                Description = entry.Overview
+            };
+
+            await SendNotification(notification, null).ConfigureAwait(false);
+        }
+
+        private NotificationOptions GetOptions()
+        {
+            return _config.GetConfiguration<NotificationOptions>("notifications");
+        }
+
+        private async void OnAppHostHasUpdateAvailableChanged(object sender, EventArgs e)
+        {
+            if (!_appHost.HasUpdateAvailable)
+            {
+                return;
+            }
+
+            var type = NotificationType.ApplicationUpdateAvailable.ToString();
+
+            var notification = new NotificationRequest
+            {
+                Description = "Please see jellyfin.media for details.",
+                NotificationType = type,
+                Name = _localization.GetLocalizedString("NewVersionIsAvailable")
+            };
+
+            await SendNotification(notification, null).ConfigureAwait(false);
+        }
+
+        private void OnLibraryManagerItemAdded(object sender, ItemChangeEventArgs e)
+        {
+            if (!FilterItem(e.Item))
+            {
+                return;
+            }
+
+            lock (_libraryChangedSyncLock)
+            {
+                if (_libraryUpdateTimer == null)
+                {
+                    _libraryUpdateTimer = new Timer(
+                        LibraryUpdateTimerCallback,
+                        null,
+                        5000,
+                        Timeout.Infinite);
+                }
+                else
+                {
+                    _libraryUpdateTimer.Change(5000, Timeout.Infinite);
+                }
+
+                _itemsAdded.Add(e.Item);
+            }
+        }
+
+        private bool FilterItem(BaseItem item)
+        {
+            if (item.IsFolder)
+            {
+                return false;
+            }
+
+            if (!item.HasPathProtocol)
+            {
+                return false;
+            }
+
+            if (item is IItemByName)
+            {
+                return false;
+            }
+
+            return item.SourceType == SourceType.Library;
+        }
+
+        private async void LibraryUpdateTimerCallback(object state)
+        {
+            List<BaseItem> items;
+
+            lock (_libraryChangedSyncLock)
+            {
+                items = _itemsAdded.ToList();
+                _itemsAdded.Clear();
+                _libraryUpdateTimer!.Dispose(); // Shouldn't be null as it just set off this callback
+                _libraryUpdateTimer = null;
+            }
+
+            items = items.Take(10).ToList();
+
+            foreach (var item in items)
+            {
+                var notification = new NotificationRequest
+                {
+                    NotificationType = NotificationType.NewLibraryContent.ToString(),
+                    Name = string.Format(
+                        CultureInfo.InvariantCulture,
+                        _localization.GetLocalizedString("ValueHasBeenAddedToLibrary"),
+                        GetItemName(item)),
+                    Description = item.Overview
+                };
+
+                await SendNotification(notification, item).ConfigureAwait(false);
+            }
+        }
+
+        private static string GetItemName(BaseItem item)
+        {
+            var name = item.Name;
+            if (item is Episode episode)
+            {
+                if (episode.IndexNumber.HasValue)
+                {
+                    name = string.Format(
+                        CultureInfo.InvariantCulture,
+                        "Ep{0} - {1}",
+                        episode.IndexNumber.Value,
+                        name);
+                }
+
+                if (episode.ParentIndexNumber.HasValue)
+                {
+                    name = string.Format(
+                        CultureInfo.InvariantCulture,
+                        "S{0}, {1}",
+                        episode.ParentIndexNumber.Value,
+                        name);
+                }
+            }
+
+            if (item is IHasSeries hasSeries)
+            {
+                name = hasSeries.SeriesName + " - " + name;
+            }
+
+            if (item is IHasAlbumArtist hasAlbumArtist)
+            {
+                var artists = hasAlbumArtist.AlbumArtists;
+
+                if (artists.Count > 0)
+                {
+                    name = artists[0] + " - " + name;
+                }
+            }
+            else if (item is IHasArtist hasArtist)
+            {
+                var artists = hasArtist.Artists;
+
+                if (artists.Count > 0)
+                {
+                    name = artists[0] + " - " + name;
+                }
+            }
+
+            return name;
+        }
+
+        private async Task SendNotification(NotificationRequest notification, BaseItem? relatedItem)
+        {
+            try
+            {
+                await _notificationManager.SendNotification(notification, relatedItem, CancellationToken.None).ConfigureAwait(false);
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Error sending notification");
+            }
+        }
+
+        /// <inheritdoc />
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        /// <summary>
+        /// Releases unmanaged and - optionally - managed resources.
+        /// </summary>
+        /// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
+        protected virtual void Dispose(bool disposing)
+        {
+            if (_disposed)
+            {
+                return;
+            }
+
+            if (disposing)
+            {
+                _libraryUpdateTimer?.Dispose();
+            }
+
+            _libraryUpdateTimer = null;
+
+            _libraryManager.ItemAdded -= OnLibraryManagerItemAdded;
+            _appHost.HasPendingRestartChanged -= OnAppHostHasPendingRestartChanged;
+            _appHost.HasUpdateAvailableChanged -= OnAppHostHasUpdateAvailableChanged;
+            _activityManager.EntryCreated -= OnActivityManagerEntryCreated;
+
+            _disposed = true;
+        }
+    }
+}