n8n/packages/nodes-base/nodes/MailerLite/MailerLiteTrigger.node.ts

import {
	IHookFunctions,
	IWebhookFunctions,
} from 'n8n-core';

import {
	IDataObject,
	INodeType,
	INodeTypeDescription,
	IWebhookResponseData,
} from 'n8n-workflow';

import {
	mailerliteApiRequest,
} from './GenericFunctions';

export class MailerLiteTrigger implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'MailerLite Trigger',
		name: 'mailerLiteTrigger',
		icon: 'file:mailerLite.png',
		group: ['trigger'],
		version: 1,
		description: 'Starts the workflow when a MailerLite events occurs.',
		defaults: {
			name: 'MailerLite Trigger',
			color: '#58be72',
		},
		inputs: [],
		outputs: ['main'],
		credentials: [
			{
				name: 'mailerLiteApi',
				required: true,
			},
		],
		webhooks: [
			{
				name: 'default',
				httpMethod: 'POST',
				responseMode: 'onReceived',
				path: 'webhook',
			},
		],
		properties: [
			{
				displayName: 'Event',
				name: 'event',
				type: 'options',
				options: [
					{
						name: 'Campaign Sent',
						value: 'campaign.sent',
						description: `Fired when campaign is sent.`,
					},
					{
						name: 'Subscriber Added to Group',
						value: 'subscriber.add_to_group',
						description: `Fired when a subscriber is added to a group.`,
					},
					{
						name: 'Subscriber Added Throught Webform',
						value: 'subscriber.added_through_webform',
						description: `Fired when a subscriber is added though a form.`,
					},
					{
						name: 'Subscriber Autonomation Completed',
						value: 'subscriber.automation_complete',
						description: `Fired when subscriber finishes automation.`,
					},
					{
						name: 'Subscriber Autonomation Triggered',
						value: 'subscriber.automation_triggered',
						description: `Fired when subscriber starts automation.`,
					},
					{
						name: 'Subscriber Bounced',
						value: 'subscriber.bounced',
						description: `Fired when an email address bounces.`,
					},
					{
						name: 'Subscriber Created',
						value: 'subscriber.create',
						description: 'Fired when a new subscriber is added to an account.',
					},
					{
						name: 'Subscriber Complained',
						value: 'subscriber.complaint',
						description: `Fired when subscriber marks a campaign as a spam.`,
					},
					{
						name: 'Subscriber Removed from Group',
						value: 'subscriber.remove_from_group',
						description: `Fired when a subscriber is removed from a group.`,
					},
					{
						name: 'Subscriber Unsubscribe',
						value: 'subscriber.unsubscribe',
						description: `Fired when a subscriber becomes unsubscribed.`,
					},
					{
						name: 'Subscriber Updated',
						value: 'subscriber.update',
						description: `Fired when any of the subscriber's custom fields are updated.`,
					},
				],
				required: true,
				default: [],
				description: 'The events to listen to.',
			},
		],
	};

	// @ts-ignore (because of request)
	webhookMethods = {
		default: {
			async checkExists(this: IHookFunctions): Promise<boolean> {
				const webhookUrl = this.getNodeWebhookUrl('default');
				const webhookData = this.getWorkflowStaticData('node');
				const event = this.getNodeParameter('event') as string;
				// Check all the webhooks which exist already if it is identical to the
				// one that is supposed to get created.
				const endpoint = '/webhooks';
				const { webhooks } = await mailerliteApiRequest.call(this, 'GET', endpoint, {});
				for (const webhook of webhooks) {
					if (webhook.url === webhookUrl &&
						webhook.event === event) {
						// Set webhook-id to be sure that it can be deleted
						webhookData.webhookId = webhook.id as string;
						return true;
					}
				}
				return false;
			},
			async create(this: IHookFunctions): Promise<boolean> {
				const webhookData = this.getWorkflowStaticData('node');
				const webhookUrl = this.getNodeWebhookUrl('default');
				const event = this.getNodeParameter('event') as string;

				const endpoint = '/webhooks';

				const body = {
					url: webhookUrl,
					event,
				};

				const responseData = await mailerliteApiRequest.call(this, 'POST', endpoint, body);

				if (responseData.id === undefined) {
					// Required data is missing so was not successful
					return false;
				}

				webhookData.webhookId = responseData.id as string;
				return true;
			},
			async delete(this: IHookFunctions): Promise<boolean> {
				const webhookData = this.getWorkflowStaticData('node');
				if (webhookData.webhookId !== undefined) {

					const endpoint = `/webhooks/${webhookData.webhookId}`;

					try {
						await mailerliteApiRequest.call(this, 'DELETE', endpoint);
					} catch (error) {
						return false;
					}

					// Remove from the static workflow data so that it is clear
					// that no webhooks are registred anymore
					delete webhookData.webhookId;
				}
				return true;
			},
		},
	};

	async webhook(this: IWebhookFunctions): Promise<IWebhookResponseData> {
		const body = this.getBodyData() as IDataObject;

		const events = body.events as IDataObject[];

		return {
			workflowData: [
				this.helpers.returnJsonArray(events),
			],
		};
	}
}