feat: new notification provider 46elks (#5184)

Co-authored-by: Frank Elsinga <frank@elsinga.de>

server/notification-providers/46elks.js

@@ -0,0 +1,35 @@
+const NotificationProvider = require("./notification-provider");
+const axios = require("axios");
+
+class Elks extends NotificationProvider {
+    name = "Elks";
+
+    /**
+     * @inheritdoc
+     */
+    async send(notification, msg, monitorJSON = null, heartbeatJSON = null) {
+        const okMsg = "Sent Successfully.";
+        const url = "https://api.46elks.com/a1/sms";
+
+        try {
+            let data = new URLSearchParams();
+            data.append("from", notification.elksFromNumber);
+            data.append("to", notification.elksToNumber );
+            data.append("message", msg);
+
+            const config = {
+                headers: {
+                    "Authorization": "Basic " + Buffer.from(`${notification.elksUsername}:${notification.elksAuthToken}`).toString("base64")
+                }
+            };
+
+            await axios.post(url, data, config);
+
+            return okMsg;
+        } catch (error) {
+            this.throwGeneralAxiosError(error);
+        }
+    }
+}
+
+module.exports = Elks;