first commit

packages/nodes-base/nodes/Trello/TrelloTrigger.node.ts

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+import {
+	type IHookFunctions,
+	type IWebhookFunctions,
+	type INodeType,
+	type INodeTypeDescription,
+	type IWebhookResponseData,
+	NodeConnectionTypes,
+} 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: [NodeConnectionTypes.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',
+			},
+		],
+	};
+
+	webhookMethods = {
+		default: {
+			async checkExists(this: IHookFunctions): Promise<boolean> {
+				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/${credentials.apiToken}/webhooks`;
+
+				const responseData = await apiRequest.call(this, 'GET', endpoint, {});
+
+				const idModel = this.getNodeParameter('id') as string;
+				const webhookUrl = this.getNodeWebhookUrl('default');
+
+				for (const webhook of responseData) {
+					if (webhook.idModel === idModel && webhook.callbackURL === webhookUrl) {
+						// Set webhook-id to be sure that it can be deleted
+						const webhookData = this.getWorkflowStaticData('node');
+						webhookData.webhookId = webhook.id as string;
+						return true;
+					}
+				}
+
+				return false;
+			},
+			async create(this: IHookFunctions): Promise<boolean> {
+				const webhookUrl = this.getNodeWebhookUrl('default');
+
+				const credentials = await this.getCredentials('trelloApi');
+
+				const idModel = this.getNodeParameter('id') as string;
+
+				const endpoint = `tokens/${credentials.apiToken}/webhooks`;
+
+				const body = {
+					description: `n8n Webhook - ${idModel}`,
+					callbackURL: webhookUrl,
+					idModel,
+				};
+
+				const responseData = await apiRequest.call(this, 'POST', endpoint, body);
+
+				if (responseData.id === undefined) {
+					// Required data is missing so was not successful
+					return false;
+				}
+
+				const webhookData = this.getWorkflowStaticData('node');
+				webhookData.webhookId = responseData.id as string;
+
+				return true;
+			},
+			async delete(this: IHookFunctions): Promise<boolean> {
+				const webhookData = this.getWorkflowStaticData('node');
+
+				if (webhookData.webhookId !== undefined) {
+					const credentials = await this.getCredentials('trelloApi');
+
+					const endpoint = `tokens/${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 registered anymore
+					delete webhookData.webhookId;
+				}
+
+				return true;
+			},
+		},
+	};
+
+	async webhook(this: IWebhookFunctions): Promise<IWebhookResponseData> {
+		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)],
+		};
+	}
+}