feat: Add WhatsApp Business Trigger Node (#8840)

Co-authored-by: Giulio Andreini <andreini@netseven.it>
Co-authored-by: Michael Kret <michael.k@radency.com>

packages/nodes-base/nodes/WhatsApp/GenericFunctions.ts

@@ -0,0 +1,103 @@
+import type {
+	IDataObject,
+	IExecuteFunctions,
+	IHookFunctions,
+	IHttpRequestMethods,
+	IHttpRequestOptions,
+	ILoadOptionsFunctions,
+	IWebhookFunctions,
+	JsonObject,
+} from 'n8n-workflow';
+import { NodeApiError } from 'n8n-workflow';
+import type {
+	WhatsAppAppWebhookSubscriptionsResponse,
+	WhatsAppAppWebhookSubscription,
+} from './types';
+
+async function appAccessTokenRead(
+	this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IWebhookFunctions,
+): Promise<{ access_token: string }> {
+	const credentials = await this.getCredentials('whatsAppTriggerApi');
+
+	const options: IHttpRequestOptions = {
+		headers: {
+			'content-type': 'application/x-www-form-urlencoded',
+		},
+		method: 'POST',
+		body: {
+			client_id: credentials.clientId,
+			client_secret: credentials.clientSecret,
+			grant_type: 'client_credentials',
+		},
+		url: 'https://graph.facebook.com/v19.0/oauth/access_token',
+		json: true,
+	};
+	try {
+		return await this.helpers.httpRequest.call(this, options);
+	} catch (error) {
+		throw new NodeApiError(this.getNode(), error as JsonObject);
+	}
+}
+
+async function whatsappApiRequest(
+	this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IWebhookFunctions,
+	method: IHttpRequestMethods,
+	resource: string,
+	body?: { type: 'json'; payload: IDataObject } | { type: 'form'; payload: IDataObject },
+	qs: IDataObject = {},
+): Promise<any> {
+	const tokenResponse = await appAccessTokenRead.call(this);
+	const appAccessToken = tokenResponse.access_token;
+
+	const options: IHttpRequestOptions = {
+		headers: {
+			accept: 'application/json',
+			authorization: `Bearer ${appAccessToken}`,
+		},
+		method,
+		qs,
+		body: body?.payload,
+		url: `https://graph.facebook.com/v19.0${resource}`,
+		json: true,
+	};
+
+	try {
+		return await this.helpers.httpRequest.call(this, options);
+	} catch (error) {
+		throw new NodeApiError(this.getNode(), error as JsonObject);
+	}
+}
+
+export async function appWebhookSubscriptionList(
+	this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IWebhookFunctions,
+	appId: string,
+): Promise<WhatsAppAppWebhookSubscription[]> {
+	const response = (await whatsappApiRequest.call(
+		this,
+		'GET',
+		`/${appId}/subscriptions`,
+	)) as WhatsAppAppWebhookSubscriptionsResponse;
+	return response.data;
+}
+
+export async function appWebhookSubscriptionCreate(
+	this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IWebhookFunctions,
+	appId: string,
+	subscription: IDataObject,
+) {
+	return await whatsappApiRequest.call(this, 'POST', `/${appId}/subscriptions`, {
+		type: 'form',
+		payload: { ...subscription },
+	});
+}
+
+export async function appWebhookSubscriptionDelete(
+	this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IWebhookFunctions,
+	appId: string,
+	object: string,
+) {
+	return await whatsappApiRequest.call(this, 'DELETE', `/${appId}/subscriptions`, {
+		type: 'form',
+		payload: { object },
+	});
+}