Add support for Whapi notification provider (#4323)

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

server/notification-providers/whapi.js

@@ -0,0 +1,39 @@
+const NotificationProvider = require("./notification-provider");
+const axios = require("axios");
+
+class Whapi extends NotificationProvider {
+    name = "whapi";
+
+    /**
+     * @inheritdoc
+     */
+    async send(notification, msg, monitorJSON = null, heartbeatJSON = null) {
+        const okMsg = "Sent Successfully.";
+
+        try {
+            const config = {
+                headers: {
+                    "Accept": "application/json",
+                    "Content-Type": "application/json",
+                    "Authorization": "Bearer " + notification.whapiAuthToken,
+                }
+            };
+
+            let data = {
+                "to": notification.whapiRecipient,
+                "body": msg,
+            };
+
+            let url = (notification.whapiApiUrl || "https://gate.whapi.cloud/").replace(/\/+$/, "") + "/messages/text";
+
+            await axios.post(url, data, config);
+
+            return okMsg;
+        } catch (error) {
+            this.throwGeneralAxiosError(error);
+        }
+    }
+
+}
+
+module.exports = Whapi;