Add WhatsApp (WAHA) notification provider (#5647)

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

server/notification-providers/waha.js

@@ -0,0 +1,40 @@
+const NotificationProvider = require("./notification-provider");
+const axios = require("axios");
+
+class WAHA extends NotificationProvider {
+    name = "waha";
+
+    /**
+     * @inheritdoc
+     */
+    async send(notification, msg, monitorJSON = null, heartbeatJSON = null) {
+        const okMsg = "Sent Successfully.";
+
+        try {
+            const config = {
+                headers: {
+                    "Accept": "application/json",
+                    "Content-Type": "application/json",
+                    "X-Api-Key": notification.wahaApiKey,
+                }
+            };
+
+            let data = {
+                "session": notification.wahaSession,
+                "chatId": notification.wahaChatId,
+                "text": msg,
+            };
+
+            let url = notification.wahaApiUrl.replace(/([^/])\/+$/, "$1") + "/api/sendText";
+
+            await axios.post(url, data, config);
+
+            return okMsg;
+        } catch (error) {
+            this.throwGeneralAxiosError(error);
+        }
+    }
+
+}
+
+module.exports = WAHA;