mirror of
https://github.com/n8n-io/n8n.git
synced 2024-11-10 06:34:05 -08:00
523 lines
12 KiB
TypeScript
523 lines
12 KiB
TypeScript
import {
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BINARY_ENCODING,
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IWebhookFunctions,
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} from 'n8n-core';
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import {
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IDataObject,
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INodeExecutionData,
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INodeType,
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INodeTypeDescription,
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IWebhookResponseData,
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NodeApiError,
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NodeOperationError,
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} from 'n8n-workflow';
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import * as basicAuth from 'basic-auth';
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import { Response } from 'express';
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import * as fs from 'fs';
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import * as formidable from 'formidable';
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function authorizationError(resp: Response, realm: string, responseCode: number, message?: string) {
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if (message === undefined) {
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message = 'Authorization problem!';
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if (responseCode === 401) {
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message = 'Authorization is required!';
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} else if (responseCode === 403) {
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message = 'Authorization data is wrong!';
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}
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}
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resp.writeHead(responseCode, { 'WWW-Authenticate': `Basic realm="${realm}"` });
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resp.end(message);
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return {
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noWebhookResponse: true,
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};
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}
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export class Webhook implements INodeType {
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description: INodeTypeDescription = {
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displayName: 'Webhook',
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icon: 'file:webhook.svg',
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name: 'webhook',
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group: ['trigger'],
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version: 1,
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description: 'Starts the workflow when a webhook is called',
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defaults: {
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name: 'Webhook',
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color: '#885577',
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},
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inputs: [],
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outputs: ['main'],
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credentials: [
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{
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name: 'httpBasicAuth',
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required: true,
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displayOptions: {
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show: {
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authentication: [
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'basicAuth',
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],
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},
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},
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},
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{
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name: 'httpHeaderAuth',
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required: true,
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displayOptions: {
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show: {
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authentication: [
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'headerAuth',
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],
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},
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},
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},
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],
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webhooks: [
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{
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name: 'default',
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httpMethod: '={{$parameter["httpMethod"]}}',
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isFullPath: true,
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responseCode: '={{$parameter["responseCode"]}}',
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responseMode: '={{$parameter["responseMode"]}}',
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responseData: '={{$parameter["responseData"]}}',
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responseBinaryPropertyName: '={{$parameter["responseBinaryPropertyName"]}}',
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responseContentType: '={{$parameter["options"]["responseContentType"]}}',
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responsePropertyName: '={{$parameter["options"]["responsePropertyName"]}}',
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responseHeaders: '={{$parameter["options"]["responseHeaders"]}}',
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path: '={{$parameter["path"]}}',
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},
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],
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properties: [
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{
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displayName: 'Authentication',
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name: 'authentication',
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type: 'options',
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options: [
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{
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name: 'Basic Auth',
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value: 'basicAuth',
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},
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{
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name: 'Header Auth',
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value: 'headerAuth',
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},
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{
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name: 'None',
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value: 'none',
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},
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],
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default: 'none',
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description: 'The way to authenticate.',
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},
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{
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displayName: 'HTTP Method',
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name: 'httpMethod',
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type: 'options',
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options: [
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{
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name: 'GET',
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value: 'GET',
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},
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{
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name: 'HEAD',
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value: 'HEAD',
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},
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{
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name: 'POST',
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value: 'POST',
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},
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],
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default: 'GET',
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description: 'The HTTP method to liste to.',
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},
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{
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displayName: 'Path',
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name: 'path',
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type: 'string',
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default: '',
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placeholder: 'webhook',
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required: true,
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description: 'The path to listen to.',
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},
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{
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displayName: 'Response Code',
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name: 'responseCode',
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type: 'number',
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typeOptions: {
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minValue: 100,
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maxValue: 599,
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},
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default: 200,
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description: 'The HTTP Response code to return',
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},
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{
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displayName: 'Response Mode',
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name: 'responseMode',
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type: 'options',
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options: [
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{
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name: 'On Received',
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value: 'onReceived',
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description: 'Returns directly with defined Response Code',
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},
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{
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name: 'Last Node',
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value: 'lastNode',
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description: 'Returns data of the last executed node',
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},
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],
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default: 'onReceived',
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description: 'When and how to respond to the webhook.',
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},
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{
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displayName: 'Response Data',
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name: 'responseData',
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type: 'options',
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displayOptions: {
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show: {
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responseMode: [
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'lastNode',
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],
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},
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},
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options: [
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{
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name: 'All Entries',
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value: 'allEntries',
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description: 'Returns all the entries of the last node. Always returns an array.',
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},
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{
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name: 'First Entry JSON',
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value: 'firstEntryJson',
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description: 'Returns the JSON data of the first entry of the last node. Always returns a JSON object.',
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},
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{
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name: 'First Entry Binary',
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value: 'firstEntryBinary',
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description: 'Returns the binary data of the first entry of the last node. Always returns a binary file.',
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},
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],
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default: 'firstEntryJson',
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description: 'What data should be returned. If it should return<br />all the itemsas array or only the first item as object.',
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},
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{
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displayName: 'Property Name',
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name: 'responseBinaryPropertyName',
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type: 'string',
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required: true,
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default: 'data',
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displayOptions: {
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show: {
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responseData: [
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'firstEntryBinary',
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],
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},
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},
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description: 'Name of the binary property to return',
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},
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{
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displayName: 'Options',
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name: 'options',
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type: 'collection',
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placeholder: 'Add Option',
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default: {},
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options: [
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{
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displayName: 'Binary Data',
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name: 'binaryData',
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type: 'boolean',
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displayOptions: {
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show: {
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'/httpMethod': [
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'POST',
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],
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},
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},
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default: false,
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description: 'Set to true if webhook will receive binary data.',
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},
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{
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displayName: 'Binary Property',
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name: 'binaryPropertyName',
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type: 'string',
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default: 'data',
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required: true,
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displayOptions: {
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show: {
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binaryData: [
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true,
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],
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},
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},
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description: `Name of the binary property to which to write the data of<br />
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the received file. If the data gets received via "Form-Data Multipart"<br />
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it will be the prefix and a number starting with 0 will be attached to it.`,
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},
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{
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displayName: 'Response Data',
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name: 'responseData',
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type: 'string',
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displayOptions: {
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show: {
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'/responseMode': [
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'onReceived',
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],
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},
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},
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default: '',
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placeholder: 'success',
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description: 'Custom response data to send.',
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},
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{
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displayName: 'Response Content-Type',
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name: 'responseContentType',
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type: 'string',
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displayOptions: {
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show: {
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'/responseData': [
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'firstEntryJson',
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],
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'/responseMode': [
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'lastNode',
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],
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},
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},
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default: '',
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placeholder: 'application/xml',
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description: 'Set a custom content-type to return if another one as the "application/json" should be returned.',
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},
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{
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displayName: 'Response Headers',
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name: 'responseHeaders',
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placeholder: 'Add Response Header',
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description: 'Add headers to the webhook response.',
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type: 'fixedCollection',
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typeOptions: {
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multipleValues: true,
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},
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default: {},
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options: [
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{
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name: 'entries',
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displayName: 'Entries',
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values: [
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{
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displayName: 'Name',
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name: 'name',
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type: 'string',
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default: '',
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description: 'Name of the header.',
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},
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{
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displayName: 'Value',
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name: 'value',
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type: 'string',
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default: '',
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description: 'Value of the header.',
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},
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],
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},
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],
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},
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{
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displayName: 'Property Name',
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name: 'responsePropertyName',
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type: 'string',
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displayOptions: {
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show: {
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'/responseData': [
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'firstEntryJson',
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],
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'/responseMode': [
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'lastNode',
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],
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},
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},
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default: 'data',
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description: 'Name of the property to return the data of instead of the whole JSON.',
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},
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{
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displayName: 'Raw Body',
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name: 'rawBody',
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type: 'boolean',
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displayOptions: {
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hide: {
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binaryData: [
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true,
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],
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},
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},
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default: false,
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description: 'Raw body (binary)',
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},
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],
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},
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],
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};
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async webhook(this: IWebhookFunctions): Promise<IWebhookResponseData> {
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const authentication = this.getNodeParameter('authentication') as string;
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const options = this.getNodeParameter('options', {}) as IDataObject;
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const req = this.getRequestObject();
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const resp = this.getResponseObject();
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const headers = this.getHeaderData();
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const realm = 'Webhook';
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if (authentication === 'basicAuth') {
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// Basic authorization is needed to call webhook
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const httpBasicAuth = this.getCredentials('httpBasicAuth');
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if (httpBasicAuth === undefined || !httpBasicAuth.user || !httpBasicAuth.password) {
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// Data is not defined on node so can not authenticate
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return authorizationError(resp, realm, 500, 'No authentication data defined on node!');
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}
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const basicAuthData = basicAuth(req);
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if (basicAuthData === undefined) {
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// Authorization data is missing
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return authorizationError(resp, realm, 401);
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}
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if (basicAuthData.name !== httpBasicAuth!.user || basicAuthData.pass !== httpBasicAuth!.password) {
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// Provided authentication data is wrong
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return authorizationError(resp, realm, 403);
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}
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} else if (authentication === 'headerAuth') {
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// Special header with value is needed to call webhook
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const httpHeaderAuth = this.getCredentials('httpHeaderAuth');
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if (httpHeaderAuth === undefined || !httpHeaderAuth.name || !httpHeaderAuth.value) {
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// Data is not defined on node so can not authenticate
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return authorizationError(resp, realm, 500, 'No authentication data defined on node!');
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}
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const headerName = (httpHeaderAuth.name as string).toLowerCase();
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const headerValue = (httpHeaderAuth.value as string);
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if (!headers.hasOwnProperty(headerName) || (headers as IDataObject)[headerName] !== headerValue) {
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// Provided authentication data is wrong
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return authorizationError(resp, realm, 403);
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}
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}
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// @ts-ignore
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const mimeType = headers['content-type'] || 'application/json';
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if (mimeType.includes('multipart/form-data')) {
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const form = new formidable.IncomingForm({});
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return new Promise((resolve, reject) => {
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form.parse(req, async (err, data, files) => {
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const returnItem: INodeExecutionData = {
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binary: {},
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json: {
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headers,
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params: this.getParamsData(),
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query: this.getQueryData(),
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body: data,
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},
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};
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let count = 0;
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for (const file of Object.keys(files)) {
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let binaryPropertyName = file;
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if (options.binaryPropertyName) {
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binaryPropertyName = `${options.binaryPropertyName}${count}`;
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}
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const fileJson = (files[file] as formidable.File).toJSON() as unknown as IDataObject;
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const fileContent = await fs.promises.readFile((files[file] as formidable.File).path);
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returnItem.binary![binaryPropertyName] = await this.helpers.prepareBinaryData(Buffer.from(fileContent), fileJson.name as string, fileJson.type as string);
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count += 1;
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}
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resolve({
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workflowData: [
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[
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returnItem,
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],
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],
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});
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});
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});
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}
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if (options.binaryData === true) {
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return new Promise((resolve, reject) => {
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const binaryPropertyName = options.binaryPropertyName || 'data';
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const data: Buffer[] = [];
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req.on('data', (chunk) => {
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data.push(chunk);
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});
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req.on('end', async () => {
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const returnItem: INodeExecutionData = {
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binary: {},
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json: {
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headers,
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params: this.getParamsData(),
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query: this.getQueryData(),
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body: this.getBodyData(),
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},
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};
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returnItem.binary![binaryPropertyName as string] = await this.helpers.prepareBinaryData(Buffer.concat(data));
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return resolve({
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workflowData: [
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[
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returnItem,
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],
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],
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});
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});
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req.on('error', (error) => {
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throw new NodeOperationError(this.getNode(), error);
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});
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});
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}
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const response: INodeExecutionData = {
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json: {
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headers,
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params: this.getParamsData(),
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query: this.getQueryData(),
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body: this.getBodyData(),
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},
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};
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if (options.rawBody) {
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response.binary = {
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data: {
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// @ts-ignore
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data: req.rawBody.toString(BINARY_ENCODING),
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mimeType,
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},
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};
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}
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let webhookResponse: string | undefined;
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if (options.responseData) {
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webhookResponse = options.responseData as string;
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}
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return {
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webhookResponse,
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workflowData: [
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[
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response,
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],
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],
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};
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}
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}
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