n8n/packages/nodes-base/nodes/Flow/FlowTrigger.node.ts

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

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

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

export class FlowTrigger implements INodeType {
	description: INodeTypeDescription = {
		displayName: 'Flow Trigger',
		name: 'flow',
		icon: 'file:flow.png',
		group: ['trigger'],
		version: 1,
		description: 'Handle Flow events via webhooks',
		defaults: {
			name: 'Flow Trigger',
			color: '#559922',
		},
		inputs: [],
		outputs: ['main'],
		credentials: [
			{
				name: 'flowApi',
				required: true,
			}
		],
		webhooks: [
			{
				name: 'default',
				httpMethod: 'POST',
				responseMode: 'onReceived',
				path: 'webhook',
			},
		],
		properties: [
			{
				displayName: 'Resource',
				name: 'resource',
				type: 'options',
				default: '',
				options:
					[
						{
							name: 'Project',
							value: 'list'
						},
						{
							name: 'Task',
							value: 'task'
						},
					],
				description: 'Resource that triggers the webhook',
			},
			{
				displayName: 'Project ID',
				name: 'listIds',
				type: 'string',
				required: true,
				default: [],
				displayOptions: {
					show: {
						resource:[
							'list'
						]
					},
					hide: {
						resource: [
							'task'
						]
					}
				},
				description: `Lists ids, perhaps known better as "Projects" separated by ,`,
			},
			{
				displayName: 'Task ID',
				name: 'taskIds',
				type: 'string',
				required: true,
				default: [],
				displayOptions: {
					show: {
						resource:[
							'task'
						]
					},
					hide: {
						resource: [
							'list'
						]
					}
				},
				description: `Taks ids separated by ,`,
			},
		],

	};
	// @ts-ignore
	webhookMethods = {
		default: {
			async checkExists(this: IHookFunctions): Promise<boolean> {
				const credentials = this.getCredentials('flowApi');

				if (credentials === undefined) {
					throw new Error('No credentials got returned!');
				}

				let webhooks;
				const qs: IDataObject = {};
				const webhookData = this.getWorkflowStaticData('node');
				if (!Array.isArray(webhookData.webhookIds)) {
					webhookData.webhookIds = [];
				}
				if (!(webhookData.webhookIds as [number]).length) {
					return false;
				}
				qs.organization_id = credentials.organizationId as number;
				const endpoint = `/integration_webhooks`;
				try {
					webhooks = await flowApiRequest.call(this, 'GET', endpoint, {}, qs);
					webhooks = webhooks.integration_webhooks;
				} catch (e) {
					throw e;
				}
				for (const webhook of webhooks) {
					// @ts-ignore
					if (webhookData.webhookIds.includes(webhook.id)) {
						continue;
					} else {
						return false;
					}
				}
				return true;
			},
			async create(this: IHookFunctions): Promise<boolean> {
				const credentials = this.getCredentials('flowApi');

				if (credentials === undefined) {
					throw new Error('No credentials got returned!');
				}

				let resourceIds, body, responseData;
				const webhookUrl = this.getNodeWebhookUrl('default');
				const webhookData = this.getWorkflowStaticData('node');
				const resource = this.getNodeParameter('resource') as string;
				const endpoint = `/integration_webhooks`;
				if (resource === 'list') {
					resourceIds = (this.getNodeParameter('listIds') as string).split(',');
				}
				if (resource === 'task') {
					resourceIds = (this.getNodeParameter('taskIds') as string).split(',');
				}
				// @ts-ignore
				for (const resourceId of resourceIds ) {
					body = {
						organization_id: credentials.organizationId as number,
						integration_webhook: {
							name: 'n8n-trigger',
							url: webhookUrl,
							resource_type: resource,
							resource_id: parseInt(resourceId, 10),
						}
					};
					try {
						 responseData = await flowApiRequest.call(this, 'POST', endpoint, body);
					} catch(error) {
						return false;
					}
					if (responseData.integration_webhook === undefined
						|| responseData.integration_webhook.id === undefined) {
						// Required data is missing so was not successful
						return false;
					}
					// @ts-ignore
					webhookData.webhookIds.push(responseData.integration_webhook.id);
				}
				return true;
			},
			async delete(this: IHookFunctions): Promise<boolean> {
				const credentials = this.getCredentials('flowApi');

				if (credentials === undefined) {
					throw new Error('No credentials got returned!');
				}

				const qs: IDataObject = {};
				const webhookData = this.getWorkflowStaticData('node');
				qs.organization_id = credentials.organizationId as number;
				// @ts-ignore
				if (webhookData.webhookIds.length > 0) {
					// @ts-ignore
					for (const webhookId of webhookData.webhookIds ) {
						const endpoint = `/integration_webhooks/${webhookId}`;
						try {
							await flowApiRequest.call(this, 'DELETE', endpoint, {}, qs);
						} catch (e) {
							return false;
						}
					}
					delete webhookData.webhookIds;
				}
				return true;
			},
		},
	};

	async webhook(this: IWebhookFunctions): Promise<IWebhookResponseData> {
		const req = this.getRequestObject();
		return {
			workflowData: [
				this.helpers.returnJsonArray(req.body)
			],
		};
	}
}