New: Added support for Gotify notifications (#730)

* Added support for Gotify notifications

* Removed non-supported features and adjusted priorities

* Use string interpolation to build url

* Rename a few variables and improve Url validation

* Improve building of the Url, move validation to Gotify.cs (adapting changes by markus101 over at Sonarr)

* Move validation from GotifyProxy.cs to here (adapting changes by markus101 over at Sonarr)

src/NzbDrone.Core/Notifications/Gotify/Gotify.cs

@@ -0,0 +1,67 @@
+using System;
+using System.Collections.Generic;
+using FluentValidation.Results;
+using NLog;
+
+namespace NzbDrone.Core.Notifications.Gotify
+{
+    public class Gotify : NotificationBase<GotifySettings>
+    {
+        private readonly IGotifyProxy _proxy;
+        private readonly Logger _logger;
+
+        public Gotify(IGotifyProxy proxy, Logger logger)
+        {
+            _proxy = proxy;
+            _logger = logger;
+        }
+
+        public override string Name => "Gotify";
+        public override string Link => "https://gotify.net/";
+
+        public override void OnGrab(GrabMessage grabMessage)
+        {
+            _proxy.SendNotification(ALBUM_GRABBED_TITLE, grabMessage.Message, Settings);
+        }
+
+        public override void OnReleaseImport(AlbumDownloadMessage message)
+        {
+            _proxy.SendNotification(ALBUM_DOWNLOADED_TITLE, message.Message, Settings);
+        }
+
+        public override void OnHealthIssue(HealthCheck.HealthCheck healthCheck)
+        {
+            _proxy.SendNotification(HEALTH_ISSUE_TITLE, healthCheck.Message, Settings);
+        }
+
+        public override void OnDownloadFailure(DownloadFailedMessage message)
+        {
+            _proxy.SendNotification(DOWNLOAD_FAILURE_TITLE, message.Message, Settings);
+        }
+
+        public override void OnImportFailure(AlbumDownloadMessage message)
+        {
+            _proxy.SendNotification(IMPORT_FAILURE_TITLE, message.Message, Settings);
+        }
+
+        public override ValidationResult Test()
+        {
+            var failures = new List<ValidationFailure>();
+
+            try
+            {
+                const string title = "Test Notification";
+                const string body = "This is a test message from Lidarr";
+
+                _proxy.SendNotification(title, body, Settings);
+            }
+            catch (Exception ex)
+            {
+                _logger.Error(ex, "Unable to send test message");
+                failures.Add(new ValidationFailure("", "Unable to send test message"));
+            }
+
+            return new ValidationResult(failures);
+        }
+    }
+}

src/NzbDrone.Core/Notifications/Gotify/GotifyPriority.cs

@@ -0,0 +1,11 @@
+namespace NzbDrone.Core.Notifications.Gotify
+
+{
+    public enum GotifyPriority
+    {
+        Min = 0,
+        Low = 2,
+        Normal = 5,
+        High = 8
+    }
+}

src/NzbDrone.Core/Notifications/Gotify/GotifyProxy.cs

@@ -0,0 +1,26 @@
+using RestSharp;
+using NzbDrone.Core.Rest;
+
+namespace NzbDrone.Core.Notifications.Gotify
+{
+    public interface IGotifyProxy
+    {
+        void SendNotification(string title, string message, GotifySettings settings);
+    }
+
+    public class GotifyProxy : IGotifyProxy
+    {
+        public void SendNotification(string title, string message, GotifySettings settings)
+        {
+            var client = RestClientFactory.BuildClient(settings.Server);
+            var request = new RestRequest("message", Method.POST);
+
+            request.AddQueryParameter("token", settings.AppToken);
+            request.AddParameter("title", title);
+            request.AddParameter("message", message);
+            request.AddParameter("priority", settings.Priority);
+
+            client.ExecuteAndValidate(request);
+        }
+    }
+}

src/NzbDrone.Core/Notifications/Gotify/GotifySettings.cs

@@ -0,0 +1,40 @@
+using FluentValidation;
+using NzbDrone.Core.Annotations;
+using NzbDrone.Core.ThingiProvider;
+using NzbDrone.Core.Validation;
+
+namespace NzbDrone.Core.Notifications.Gotify
+{
+    public class GotifySettingsValidator : AbstractValidator<GotifySettings>
+    {
+        public GotifySettingsValidator()
+        {
+            RuleFor(c => c.Server).IsValidUrl();
+            RuleFor(c => c.AppToken).NotEmpty();
+        }
+    }
+
+    public class GotifySettings : IProviderConfig
+    {
+        private static readonly GotifySettingsValidator Validator = new GotifySettingsValidator();
+
+        public GotifySettings()
+        {
+            Priority = 5;
+        }
+
+        [FieldDefinition(0, Label = "Gotify Server", HelpText = "Gotify server URL, including http(s):// and port if needed")]
+        public string Server { get; set; }
+
+        [FieldDefinition(1, Label = "App Token", HelpText = "The Application Token generated by Gotify")]
+        public string AppToken { get; set; }
+
+        [FieldDefinition(2, Label = "Priority", Type = FieldType.Select, SelectOptions = typeof(GotifyPriority), HelpText = "Priority of the notification")]
+        public int Priority { get; set; }
+
+        public NzbDroneValidationResult Validate()
+        {
+            return new NzbDroneValidationResult(Validator.Validate(this));
+        }
+    }
+}

src/NzbDrone.Core/Notifications/Gotify/InvalidResponseException.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace NzbDrone.Core.Notifications.Gotify
+{
+    public class InvalidResponseException : Exception
+    {
+        public InvalidResponseException()
+        {
+        }
+
+        public InvalidResponseException(string message) : base(message)
+        {
+        }
+    }
+}

src/NzbDrone.Core/NzbDrone.Core.csproj

@@ -936,6 +936,11 @@
     <Compile Include="Music\TrackService.cs" />
     <Compile Include="Notifications\AlbumDownloadMessage.cs" />
     <Compile Include="Notifications\DownloadFailedMessage.cs" />
+    <Compile Include="Notifications\Gotify\Gotify.cs" />
+    <Compile Include="Notifications\Gotify\GotifyPriority.cs" />
+    <Compile Include="Notifications\Gotify\GotifyProxy.cs" />
+    <Compile Include="Notifications\Gotify\GotifySettings.cs" />
+    <Compile Include="Notifications\Gotify\InvalidResponseException.cs" />
     <Compile Include="Notifications\Join\JoinAuthException.cs" />
     <Compile Include="Notifications\Join\JoinInvalidDeviceException.cs" />
     <Compile Include="Notifications\Join\JoinPriority.cs" />