mirror of
https://github.com/n8n-io/n8n.git
synced 2024-11-15 17:14:05 -08:00
427 lines
11 KiB
TypeScript
427 lines
11 KiB
TypeScript
import {
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type IDataObject,
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type IWebhookFunctions,
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type IWebhookResponseData,
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type INodeType,
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type INodeTypeDescription,
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NodeConnectionType,
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} from 'n8n-workflow';
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import { pick } from 'lodash';
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import type { BaseChatMemory } from '@langchain/community/memory/chat_memory';
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import { createPage } from './templates';
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import { validateAuth } from './GenericFunctions';
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import type { LoadPreviousSessionChatOption } from './types';
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const CHAT_TRIGGER_PATH_IDENTIFIER = 'chat';
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export class ChatTrigger implements INodeType {
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description: INodeTypeDescription = {
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displayName: 'Chat Trigger',
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name: 'chatTrigger',
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icon: 'fa:comments',
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iconColor: 'black',
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group: ['trigger'],
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version: 1,
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description: 'Runs the workflow when an n8n generated webchat is submitted',
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defaults: {
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name: 'When chat message received',
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},
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codex: {
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categories: ['Core Nodes'],
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resources: {
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primaryDocumentation: [
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{
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url: 'https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-langchain.chattrigger/',
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},
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],
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},
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},
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supportsCORS: true,
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maxNodes: 1,
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inputs: `={{ (() => {
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if (!['hostedChat', 'webhook'].includes($parameter.mode)) {
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return [];
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}
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if ($parameter.options?.loadPreviousSession !== 'memory') {
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return [];
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}
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return [
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{
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displayName: 'Memory',
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maxConnections: 1,
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type: '${NodeConnectionType.AiMemory}',
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required: true,
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}
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];
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})() }}`,
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outputs: ['main'],
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credentials: [
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{
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// eslint-disable-next-line n8n-nodes-base/node-class-description-credentials-name-unsuffixed
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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: ['basicAuth'],
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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: 'setup',
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httpMethod: 'GET',
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responseMode: 'onReceived',
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path: CHAT_TRIGGER_PATH_IDENTIFIER,
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ndvHideUrl: true,
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},
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{
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name: 'default',
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httpMethod: 'POST',
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responseMode: '={{$parameter.options?.["responseMode"] || "lastNode" }}',
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path: CHAT_TRIGGER_PATH_IDENTIFIER,
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ndvHideMethod: true,
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ndvHideUrl: '={{ !$parameter.public }}',
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},
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],
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eventTriggerDescription: 'Waiting for you to submit the chat',
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activationMessage: 'You can now make calls to your production chat URL.',
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triggerPanel: false,
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properties: [
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/**
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* @note If we change this property, also update it in ChatEmbedModal.vue
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*/
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{
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displayName: 'Make Chat Publicly Available',
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name: 'public',
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type: 'boolean',
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default: false,
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description:
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'Whether the chat should be publicly available or only accessible through the manual chat interface',
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},
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{
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displayName: 'Mode',
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name: 'mode',
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type: 'options',
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options: [
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{
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name: 'Hosted Chat',
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value: 'hostedChat',
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description: 'Chat on a page served by n8n',
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},
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{
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name: 'Embedded Chat',
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value: 'webhook',
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description: 'Chat through a widget embedded in another page, or by calling a webhook',
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},
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],
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default: 'hostedChat',
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displayOptions: {
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show: {
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public: [true],
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},
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},
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},
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{
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displayName:
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'Chat will be live at the URL above once you activate this workflow. Live executions will show up in the ‘executions’ tab',
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name: 'hostedChatNotice',
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type: 'notice',
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displayOptions: {
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show: {
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mode: ['hostedChat'],
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public: [true],
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},
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},
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default: '',
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},
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{
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displayName:
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'Follow the instructions <a href="https://www.npmjs.com/package/@n8n/chat" target="_blank">here</a> to embed chat in a webpage (or just call the webhook URL at the top of this section). Chat will be live once you activate this workflow',
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name: 'embeddedChatNotice',
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type: 'notice',
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displayOptions: {
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show: {
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mode: ['webhook'],
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public: [true],
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},
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},
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default: '',
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},
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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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displayOptions: {
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show: {
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public: [true],
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},
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},
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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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description: 'Simple username and password (the same one for all users)',
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},
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{
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// eslint-disable-next-line n8n-nodes-base/node-param-display-name-miscased
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name: 'n8n User Auth',
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value: 'n8nUserAuth',
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description: 'Require user to be logged in with their n8n account',
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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: 'Initial Message(s)',
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name: 'initialMessages',
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type: 'string',
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displayOptions: {
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show: {
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mode: ['hostedChat'],
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public: [true],
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},
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},
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typeOptions: {
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rows: 3,
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},
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default: 'Hi there! 👋\nMy name is Nathan. How can I assist you today?',
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description: 'Default messages shown at the start of the chat, one per line',
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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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displayOptions: {
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show: {
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mode: ['hostedChat', 'webhook'],
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public: [true],
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},
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},
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placeholder: 'Add Field',
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default: {},
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options: [
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{
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displayName: 'Input Placeholder',
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name: 'inputPlaceholder',
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type: 'string',
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displayOptions: {
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show: {
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'/mode': ['hostedChat'],
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},
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},
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default: 'Type your question..',
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placeholder: 'e.g. Type your message here',
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description: 'Shown as placeholder text in the chat input field',
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},
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{
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displayName: 'Load Previous Session',
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name: 'loadPreviousSession',
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type: 'options',
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options: [
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{
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name: 'Off',
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value: 'notSupported',
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description: 'Loading messages of previous session is turned off',
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},
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{
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name: 'From Memory',
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value: 'memory',
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description: 'Load session messages from memory',
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},
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{
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name: 'Manually',
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value: 'manually',
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description: 'Manually return messages of session',
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},
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],
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default: 'notSupported',
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description: 'If loading messages of a previous session should be enabled',
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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: 'When Last Node Finishes',
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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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name: "Using 'Respond to Webhook' Node",
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value: 'responseNode',
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description: 'Response defined in that node',
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},
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],
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default: 'lastNode',
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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: 'Require Button Click to Start Chat',
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name: 'showWelcomeScreen',
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type: 'boolean',
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displayOptions: {
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show: {
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'/mode': ['hostedChat'],
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},
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},
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default: false,
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description: 'Whether to show the welcome screen at the start of the chat',
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},
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{
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displayName: 'Start Conversation Button Text',
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name: 'getStarted',
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type: 'string',
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displayOptions: {
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show: {
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showWelcomeScreen: [true],
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'/mode': ['hostedChat'],
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},
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},
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default: 'New Conversation',
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placeholder: 'e.g. New Conversation',
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description: 'Shown as part of the welcome screen, in the middle of the chat window',
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},
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{
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displayName: 'Subtitle',
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name: 'subtitle',
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type: 'string',
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displayOptions: {
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show: {
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'/mode': ['hostedChat'],
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},
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},
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default: "Start a chat. We're here to help you 24/7.",
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placeholder: "e.g. We're here for you",
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description: 'Shown at the top of the chat, under the title',
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},
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{
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displayName: 'Title',
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name: 'title',
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type: 'string',
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displayOptions: {
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show: {
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'/mode': ['hostedChat'],
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},
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},
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default: 'Hi there! 👋',
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placeholder: 'e.g. Welcome',
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description: 'Shown at the top of the chat',
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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 res = this.getResponseObject();
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const isPublic = this.getNodeParameter('public', false) as boolean;
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const nodeMode = this.getNodeParameter('mode', 'hostedChat') as string;
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if (!isPublic) {
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res.status(404).end();
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return {
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noWebhookResponse: true,
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};
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}
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const webhookName = this.getWebhookName();
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const mode = this.getMode() === 'manual' ? 'test' : 'production';
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const bodyData = this.getBodyData() ?? {};
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const options = this.getNodeParameter('options', {}) as {
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getStarted?: string;
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inputPlaceholder?: string;
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loadPreviousSession?: LoadPreviousSessionChatOption;
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showWelcomeScreen?: boolean;
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subtitle?: string;
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title?: string;
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};
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if (nodeMode === 'hostedChat') {
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try {
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await validateAuth(this);
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} catch (error) {
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if (error) {
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res.writeHead((error as IDataObject).responseCode as number, {
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'www-authenticate': 'Basic realm="Webhook"',
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});
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res.end((error as IDataObject).message as string);
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return { noWebhookResponse: true };
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}
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throw error;
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}
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// Show the chat on GET request
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if (webhookName === 'setup') {
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const webhookUrlRaw = this.getNodeWebhookUrl('default') as string;
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const webhookUrl =
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mode === 'test' ? webhookUrlRaw.replace('/webhook', '/webhook-test') : webhookUrlRaw;
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const authentication = this.getNodeParameter('authentication') as
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| 'none'
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| 'basicAuth'
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| 'n8nUserAuth';
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const initialMessagesRaw = this.getNodeParameter('initialMessages', '') as string;
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const initialMessages = initialMessagesRaw
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.split('\n')
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.filter((line) => line)
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.map((line) => line.trim());
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const instanceId = this.getInstanceId();
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const i18nConfig = pick(options, ['getStarted', 'inputPlaceholder', 'subtitle', 'title']);
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const page = createPage({
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i18n: {
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en: i18nConfig,
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},
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showWelcomeScreen: options.showWelcomeScreen,
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loadPreviousSession: options.loadPreviousSession,
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initialMessages,
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webhookUrl,
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mode,
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instanceId,
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authentication,
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});
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res.status(200).send(page).end();
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return {
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noWebhookResponse: true,
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};
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}
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}
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if (bodyData.action === 'loadPreviousSession') {
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if (options?.loadPreviousSession === 'memory') {
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const memory = (await this.getInputConnectionData(NodeConnectionType.AiMemory, 0)) as
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| BaseChatMemory
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| undefined;
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const messages = ((await memory?.chatHistory.getMessages()) ?? [])
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.filter((message) => !message?.additional_kwargs?.hideFromUI)
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.map((message) => message?.toJSON());
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return {
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webhookResponse: { data: messages },
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};
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} else if (options?.loadPreviousSession === 'notSupported') {
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// If messages of a previous session should not be loaded, simply return an empty array
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return {
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webhookResponse: { data: [] },
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};
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}
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}
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const returnData: IDataObject = { ...bodyData };
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const webhookResponse: IDataObject = { status: 200 };
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return {
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webhookResponse,
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workflowData: [this.helpers.returnJsonArray(returnData)],
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};
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}
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}
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