Add Discord Notifier

README.md

@@ -340,6 +340,18 @@ The [Pushover](https://www.pushover.net/) notification will send an image and a
 * Sound [optional]: The [sound](https://pushover.net/api#sounds) to override the user's default sound choice
 * Priority [optional]: The [priority](https://pushover.net/api#priority) with which to send the message
 
+### Discord
+Send notifications to a discord server via Discord Webhooks. You can get a Discord Webhook URL for your Discord server by following the instructions [here](https://support.discord.com/hc/en-us/articles/228383668-Intro-to-Webhooks).
+
+```json
+{
+  "Type": "Discord",
+  "DiscordWebhookUrl": " https://discord.com/api/webhooks/F4K3W3BH00K"
+}
+```
+* DiscordWebhookUrl [required]: The URL of the Discord Webhook you want to send messages to. 
+
+
 ## Caveats
 * SynoAI still relies on Surveillance Station triggering the motion alerts
 * Looking for an object, such as a car on a driveway, will continually trigger alerts if that object is in view of the camera when Surveillance Station detects movement, e.g. a tree blowing in the wind.

SynoAI/Notifiers/Discord/Discord.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net;
+using System.Net.Http;
+using System.Net.Http.Json;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
+using SynoAI.App;
+using SynoAI.Models;
+
+namespace SynoAI.Notifiers.Discord
+{
+    public class Discord : NotifierBase
+    {
+
+        /// <summary>
+        /// Discord Webhook Url
+        /// </summary>
+        public string DiscordWebhookUrl { get; set; }
+        public override async Task SendAsync(Camera camera, Notification notification, ILogger logger)
+        {
+            var formData = new MultipartFormDataContent();
+            ProcessedImage processedImage = notification.ProcessedImage;
+
+            var message = base.GetMessage(camera, notification.FoundTypes);
+            //Discord seems to require double escaped newlines
+            message = message.Replace("\n", "\\n");
+
+            formData.Add(new StringContent($"{{\"content\":\"{message}\"}}"),"payload_json");
+            formData.Add(new StreamContent(processedImage.GetReadonlyStream()),"file",processedImage.FileName);
+
+            HttpResponseMessage responseMessage = await Shared.HttpClient.PostAsync(DiscordWebhookUrl, formData);
+            if (responseMessage.IsSuccessStatusCode)
+            {
+                logger.LogInformation($"{camera.Name}: Discord: Notification sent successfully");
+            }
+            else
+            {
+                string error = await responseMessage.Content.ReadAsStringAsync();
+                logger.LogError($"{camera.Name}: Discord: The end point responded with HTTP status code '{responseMessage.StatusCode}' and error '{error}'.");
+            }
+        }
+    }
+}

SynoAI/Notifiers/Discord/DiscordFactory.cs

@@ -0,0 +1,19 @@
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+
+namespace SynoAI.Notifiers.Discord
+{
+    public class DiscordFactory : NotifierFactory
+    {
+        public override INotifier Create(ILogger logger, IConfigurationSection section)
+        {
+            string discordWebhookUrl = section.GetValue<string>("DiscordWebhookUrl");
+            logger.LogInformation("Processing Discord Config", discordWebhookUrl);
+
+            return new Discord()
+            {
+                DiscordWebhookUrl = discordWebhookUrl
+            };
+        }
+    }
+}

SynoAI/Notifiers/NotifierFactory.cs

@@ -5,6 +5,7 @@
 using SynoAI.Notifiers.Pushover;
 using SynoAI.Notifiers.Telegram;
 using SynoAI.Notifiers.Webhook;
+using SynoAI.Notifiers.Discord;
 using System;
 using System.Collections.Generic;
 
@@ -37,6 +38,9 @@ public static INotifier Create(NotifierType type, ILogger logger, IConfiguration
                 case NotifierType.Webhook:
                     factory = new WebhookFactory();
                     break;
+                case NotifierType.Discord:
+                    factory = new DiscordFactory();
+                    break;
                 default:
                     throw new NotImplementedException(type.ToString());
             }

SynoAI/Notifiers/NotifierType.cs

@@ -25,6 +25,10 @@ public enum NotifierType
         /// <summary>
         /// Calls a webhook with the image attached.
         /// </summary>
-        Webhook
+        Webhook,
+        /// <summary>
+        /// Sends a notification message using Discord with the image attached.
+        /// </summary>
+        Discord
     }
 }