import { IHookFunctions, IWebhookFunctions, } from 'n8n-core'; import { INodeType, INodeTypeDescription, IWebhookResponseData, NodeOperationError, } from 'n8n-workflow'; import { apiRequest, } from './GenericFunctions'; // import { createHmac } from 'crypto'; export class TrelloTrigger implements INodeType { description: INodeTypeDescription = { displayName: 'Trello Trigger', name: 'trelloTrigger', icon: 'file:trello.svg', group: ['trigger'], version: 1, description: 'Starts the workflow when Trello events occur', defaults: { name: 'Trello Trigger', }, inputs: [], outputs: ['main'], credentials: [ { name: 'trelloApi', required: true, }, ], webhooks: [ { name: 'setup', httpMethod: 'HEAD', responseMode: 'onReceived', path: 'webhook', }, { name: 'default', httpMethod: 'POST', responseMode: 'onReceived', path: 'webhook', }, ], properties: [ { displayName: 'Model ID', name: 'id', type: 'string', default: '', placeholder: '4d5ea62fd76aa1136000000c', required: true, description: 'ID of the model of which to subscribe to events', }, ], }; // @ts-ignore (because of request) webhookMethods = { default: { async checkExists(this: IHookFunctions): Promise { const credentials = await this.getCredentials('trelloApi'); // Check all the webhooks which exist already if it is identical to the // one that is supposed to get created. const endpoint = `tokens/${credentials.apiToken}/webhooks`; const responseData = await apiRequest.call(this, 'GET', endpoint, {}); const idModel = this.getNodeParameter('id') as string; const webhookUrl = this.getNodeWebhookUrl('default'); for (const webhook of responseData) { if (webhook.idModel === idModel && webhook.callbackURL === webhookUrl) { // Set webhook-id to be sure that it can be deleted const webhookData = this.getWorkflowStaticData('node'); webhookData.webhookId = webhook.id as string; return true; } } return false; }, async create(this: IHookFunctions): Promise { const webhookUrl = this.getNodeWebhookUrl('default'); const credentials = await this.getCredentials('trelloApi'); const idModel = this.getNodeParameter('id') as string; const endpoint = `tokens/${credentials.apiToken}/webhooks`; const body = { description: `n8n Webhook - ${idModel}`, callbackURL: webhookUrl, idModel, }; const responseData = await apiRequest.call(this, 'POST', endpoint, body); if (responseData.id === undefined) { // Required data is missing so was not successful return false; } const webhookData = this.getWorkflowStaticData('node'); webhookData.webhookId = responseData.id as string; return true; }, async delete(this: IHookFunctions): Promise { const webhookData = this.getWorkflowStaticData('node'); if (webhookData.webhookId !== undefined) { const credentials = await this.getCredentials('trelloApi'); const endpoint = `tokens/${credentials.apiToken}/webhooks/${webhookData.webhookId}`; const body = {}; try { await apiRequest.call(this, 'DELETE', endpoint, body); } 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 { const webhookName = this.getWebhookName(); if (webhookName === 'setup') { // Is a create webhook confirmation request const res = this.getResponseObject(); res.status(200).end(); return { noWebhookResponse: true, }; } const bodyData = this.getBodyData(); // TODO: Check why that does not work as expected even though it gets done as described // https://developers.trello.com/page/webhooks //const credentials = await this.getCredentials('trelloApi'); // // Check if the request is valid // const headerData = this.getHeaderData() as IDataObject; // const webhookUrl = this.getNodeWebhookUrl('default'); // const checkContent = JSON.stringify(bodyData) + webhookUrl; // const computedSignature = createHmac('sha1', credentials.oauthSecret as string).update(checkContent).digest('base64'); // if (headerData['x-trello-webhook'] !== computedSignature) { // // Signature is not valid so ignore call // return {}; // } return { workflowData: [ this.helpers.returnJsonArray(bodyData), ], }; } }