New: Add Apprise notifications

src/NzbDrone.Core/Notifications/Apprise/Apprise.cs

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+using System.Collections.Generic;
+using FluentValidation.Results;
+using NzbDrone.Common.Extensions;
+
+namespace NzbDrone.Core.Notifications.Apprise
+{
+    public class Apprise : NotificationBase<AppriseSettings>
+    {
+        public override string Name => "Apprise";
+
+        public override string Link => "https://github.com/caronc/apprise";
+
+        private readonly IAppriseProxy _proxy;
+
+        public Apprise(IAppriseProxy proxy)
+        {
+            _proxy = proxy;
+        }
+
+        public override void OnGrab(GrabMessage grabMessage)
+        {
+            _proxy.SendNotification(EPISODE_GRABBED_TITLE, grabMessage.Message, Settings);
+        }
+
+        public override void OnDownload(DownloadMessage message)
+        {
+            _proxy.SendNotification(EPISODE_DOWNLOADED_TITLE, message.Message, Settings);
+        }
+
+        public override void OnEpisodeFileDelete(EpisodeDeleteMessage deleteMessage)
+        {
+            _proxy.SendNotification(EPISODE_DELETED_TITLE, deleteMessage.Message, Settings);
+        }
+
+        public override void OnSeriesAdd(SeriesAddMessage message)
+        {
+            _proxy.SendNotification(SERIES_ADDED_TITLE, message.Message, Settings);
+        }
+
+        public override void OnSeriesDelete(SeriesDeleteMessage deleteMessage)
+        {
+            _proxy.SendNotification(SERIES_DELETED_TITLE, deleteMessage.Message, Settings);
+        }
+
+        public override void OnHealthIssue(HealthCheck.HealthCheck healthCheck)
+        {
+            _proxy.SendNotification(HEALTH_ISSUE_TITLE, healthCheck.Message, Settings);
+        }
+
+        public override void OnApplicationUpdate(ApplicationUpdateMessage updateMessage)
+        {
+            _proxy.SendNotification(APPLICATION_UPDATE_TITLE, updateMessage.Message, Settings);
+        }
+
+        public override ValidationResult Test()
+        {
+            var failures = new List<ValidationFailure>();
+
+            failures.AddIfNotNull(_proxy.Test(Settings));
+
+            return new ValidationResult(failures);
+        }
+    }
+}

src/NzbDrone.Core/Notifications/Apprise/AppriseError.cs

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+namespace NzbDrone.Core.Notifications.Apprise
+{
+    public class AppriseError
+    {
+        public string Error { get; set; }
+    }
+}

src/NzbDrone.Core/Notifications/Apprise/AppriseException.cs

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+using System;
+using NzbDrone.Common.Exceptions;
+
+namespace NzbDrone.Core.Notifications.Apprise
+{
+    public class AppriseException : NzbDroneException
+    {
+        public AppriseException(string message)
+            : base(message)
+        {
+        }
+
+        public AppriseException(string message, Exception innerException, params object[] args)
+            : base(message, innerException, args)
+        {
+        }
+    }
+}

src/NzbDrone.Core/Notifications/Apprise/AppriseNotificationType.cs

@@ -0,0 +1,19 @@
+using System.Runtime.Serialization;
+
+namespace NzbDrone.Core.Notifications.Apprise
+{
+    public enum AppriseNotificationType
+    {
+        [EnumMember(Value = "info")]
+        Info = 0,
+
+        [EnumMember(Value = "success")]
+        Success,
+
+        [EnumMember(Value = "warning")]
+        Warning,
+
+        [EnumMember(Value = "failure")]
+        Failure,
+    }
+}

src/NzbDrone.Core/Notifications/Apprise/ApprisePayload.cs

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+namespace NzbDrone.Core.Notifications.Apprise
+{
+    public class ApprisePayload
+    {
+        public string Urls { get; set; }
+
+        public string Title { get; set; }
+
+        public string Body { get; set; }
+
+        public AppriseNotificationType Type { get; set; }
+
+        public string Tag { get; set; }
+    }
+}

src/NzbDrone.Core/Notifications/Apprise/AppriseProxy.cs

@@ -0,0 +1,118 @@
+using System;
+using System.Linq;
+using System.Net;
+using FluentValidation.Results;
+using NLog;
+using NzbDrone.Common.Extensions;
+using NzbDrone.Common.Http;
+using NzbDrone.Common.Serializer;
+
+namespace NzbDrone.Core.Notifications.Apprise
+{
+    public interface IAppriseProxy
+    {
+        void SendNotification(string title, string message, AppriseSettings settings);
+        ValidationFailure Test(AppriseSettings settings);
+    }
+
+    public class AppriseProxy : IAppriseProxy
+    {
+        private readonly IHttpClient _httpClient;
+        private readonly Logger _logger;
+
+        public AppriseProxy(IHttpClient httpClient, Logger logger)
+        {
+            _httpClient = httpClient;
+            _logger = logger;
+        }
+
+        public void SendNotification(string title, string message, AppriseSettings settings)
+        {
+            var payload = new ApprisePayload
+            {
+                Title = title,
+                Body = message,
+                Type = (AppriseNotificationType)settings.NotificationType
+            };
+
+            var requestBuilder = new HttpRequestBuilder(settings.ServerUrl.TrimEnd('/', ' '))
+                .Post()
+                .Accept(HttpAccept.Json);
+
+            if (settings.ConfigurationKey.IsNotNullOrWhiteSpace())
+            {
+                requestBuilder
+                    .Resource("/notify/{configurationKey}")
+                    .SetSegment("configurationKey", settings.ConfigurationKey);
+            }
+            else if (settings.StatelessUrls.IsNotNullOrWhiteSpace())
+            {
+                requestBuilder.Resource("/notify");
+
+                payload.Urls = settings.StatelessUrls;
+            }
+
+            if (settings.Tags.Any())
+            {
+                payload.Tag = settings.Tags.Join(",");
+            }
+
+            if (settings.AuthUsername.IsNotNullOrWhiteSpace() || settings.AuthPassword.IsNotNullOrWhiteSpace())
+            {
+                requestBuilder.NetworkCredential = new BasicNetworkCredential(settings.AuthUsername, settings.AuthPassword);
+            }
+
+            var request = requestBuilder.Build();
+
+            request.Headers.ContentType = "application/json";
+            request.SetContent(payload.ToJson());
+
+            try
+            {
+                _httpClient.Execute(request);
+            }
+            catch (HttpException ex)
+            {
+                _logger.Error(ex, "Unable to send message");
+                throw new AppriseException("Unable to send Apprise notifications: {0}", ex, ex.Message);
+            }
+        }
+
+        public ValidationFailure Test(AppriseSettings settings)
+        {
+            const string title = "Sonarr - Test Notification";
+            const string body = "Success! You have properly configured your apprise notification settings.";
+
+            try
+            {
+                SendNotification(title, body, settings);
+            }
+            catch (AppriseException ex) when (ex.InnerException is HttpException httpException)
+            {
+                if (httpException.Response.StatusCode == HttpStatusCode.Unauthorized)
+                {
+                    _logger.Error(ex, $"HTTP Auth credentials are invalid: {0}", ex.Message);
+                    return new ValidationFailure("AuthUsername", $"HTTP Auth credentials are invalid: {ex.Message}");
+                }
+
+                if (httpException.Response.Content.IsNotNullOrWhiteSpace())
+                {
+                    var error = Json.Deserialize<AppriseError>(httpException.Response.Content);
+
+                    _logger.Error(ex, $"Unable to send test message. Response from API: {0}", error.Error);
+                    return new ValidationFailure(string.Empty, $"Unable to send test message. Response from API: {error.Error}");
+                }
+
+                _logger.Error(ex, "Unable to send test message. Server connection failed: ({0}) {1}", httpException.Response.StatusCode, ex.Message);
+                return new ValidationFailure("Url", $"Unable to connect to Apprise API. Server connection failed: ({httpException.Response.StatusCode}) {ex.Message}");
+            }
+            catch (Exception ex)
+            {
+                _logger.Error(ex, "Unable to send test message: {0}", ex.Message);
+                return new ValidationFailure("Url", $"Unable to send test message: {ex.Message}");
+            }
+
+            return null;
+        }
+    }
+}

src/NzbDrone.Core/Notifications/Apprise/AppriseSettings.cs

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+using System;
+using System.Collections.Generic;
+using FluentValidation;
+using NzbDrone.Common.Extensions;
+using NzbDrone.Core.Annotations;
+using NzbDrone.Core.ThingiProvider;
+using NzbDrone.Core.Validation;
+
+namespace NzbDrone.Core.Notifications.Apprise
+{
+    public class AppriseSettingsValidator : AbstractValidator<AppriseSettings>
+    {
+        public AppriseSettingsValidator()
+        {
+            RuleFor(c => c.ServerUrl).IsValidUrl();
+
+            RuleFor(c => c.ConfigurationKey).NotEmpty()
+                .When(c => c.StatelessUrls.IsNullOrWhiteSpace())
+                .WithMessage("Use either Configuration Key or Stateless URLs");
+
+            RuleFor(c => c.ConfigurationKey).Matches("^[a-z0-9-]*$")
+                .WithMessage("Allowed characters a-z, 0-9 and -");
+
+            RuleFor(c => c.StatelessUrls).NotEmpty()
+                .When(c => c.ConfigurationKey.IsNullOrWhiteSpace())
+                .WithMessage("Use either Configuration Key or Stateless URLs");
+
+            RuleFor(c => c.StatelessUrls).Empty()
+                .When(c => c.ConfigurationKey.IsNotNullOrWhiteSpace())
+                .WithMessage("Use either Configuration Key or Stateless URLs");
+
+            RuleFor(c => c.Tags).Empty()
+                .When(c => c.StatelessUrls.IsNotNullOrWhiteSpace())
+                .WithMessage("Stateless URLs do not support tags");
+        }
+    }
+
+    public class AppriseSettings : IProviderConfig
+    {
+        private static readonly AppriseSettingsValidator Validator = new ();
+
+        public AppriseSettings()
+        {
+            NotificationType = (int)AppriseNotificationType.Info;
+            Tags = Array.Empty<string>();
+        }
+
+        [FieldDefinition(1, Label = "Apprise Server URL", Type = FieldType.Url, Placeholder = "http://localhost:8000", HelpText = "Apprise server URL, including http(s):// and port if needed", HelpLink = "https://github.com/caronc/apprise-api")]
+        public string ServerUrl { get; set; }
+
+        [FieldDefinition(2, Label = "Apprise Configuration Key", Type = FieldType.Textbox, HelpText = "Configuration Key for the Persistent Storage Solution. Leave empty if Stateless URLs is used.", HelpLink = "https://github.com/caronc/apprise-api#persistent-storage-solution")]
+        public string ConfigurationKey { get; set; }
+
+        [FieldDefinition(3, Label = "Apprise Stateless URLs", Type = FieldType.Textbox, HelpText = "One or more URLs separated by commas identifying where the notification should be sent to. Leave empty if Persistent Storage is used.", HelpLink = "https://github.com/caronc/apprise#productivity-based-notifications")]
+        public string StatelessUrls { get; set; }
+
+        [FieldDefinition(4, Label = "Apprise Notification Type", Type = FieldType.Select, SelectOptions = typeof(AppriseNotificationType))]
+        public int NotificationType { get; set; }
+
+        [FieldDefinition(5, Label = "Apprise Tags", Type = FieldType.Tag, HelpText = "Optionally notify only those tagged accordingly.")]
+        public IEnumerable<string> Tags { get; set; }
+
+        [FieldDefinition(6, Label = "Username", Type = FieldType.Textbox, HelpText = "HTTP Basic Auth Username", Privacy = PrivacyLevel.UserName)]
+        public string AuthUsername { get; set; }
+
+        [FieldDefinition(7, Label = "Password", Type = FieldType.Password, HelpText = "HTTP Basic Auth Password", Privacy = PrivacyLevel.Password)]
+        public string AuthPassword { get; set; }
+
+        public NzbDroneValidationResult Validate()
+        {
+            return new NzbDroneValidationResult(Validator.Validate(this));
+        }
+    }
+}