Watson Assistant for WeChat

Watson Assistant integration in WeChat for ExpressJS.

Usage

Install

yarn install watson-assistant-for-wechat

OR

npm i watson-assistant-for-wechat

Example

Detail example is avaliable at app.js.

const {wechatWatsonAssistant} = require('watson-assistant-for-wechat');

// Initialize the applicatoin, and mount the endpoint at `/watson`
wechatWatsonAssistant(app, config, '/watson');

app.post('/watson', async (req, res) => {
	const {user, message} = req;
	const {chat} = req.app.locals;
  const storage = req.sessionStore;

  // Retrive sessionId of current WeChat user
  const sessionId = await getSessionId();

  // Post incoming text to Watson Assistant
  const {result: assistantResponse} = await chat(
    {message_type: 'text', text: message.Content},
    sessionId,
    setSessionId
  );

  // Generate response to WeChat server
  const response = reply.text(
    message.ToUserName,
    message.FromUserName,
    assistantResponse.output.generic[0].text
  );
  res.set('Content-Type', 'text/xml');
  res.send(response);
}

Configuration

Below is a list of avaliable configuration.

// Initialize the applicatoin, and mount the endpoint at `/watson`
wechatWatsonAssistant(
  app,
  {
    apiKey: process.env.IBM_CLOUD_IAM_KEY,
    assistantId: process.env.IBM_WATSON_ASSISTANT_ID,
    wechatToken: process.env.WECHAT_TOKEN,
    version: "2020-02-05",
    url: "https://api.us-south.assistant.watson.cloud.ibm.com",
    chatRequestProperty: "locals.chat",
    messageRequestProperty: "message",
    userRequestProperty: "user"
  },
  "/watson"
);

Options

apiKey (required)

IBM Cloud IAM API Key, see IBM Cloud Documentation

assistantId (required)

The ID of the Watson Assistant instance.

Avaliable at Launch assistant -> Top Right (settings) -> API Details

wechatToken (required)

The token set at WeChat server endpoint configuration, see WeChat Documentation

version

Default value 2020-02-05

Watson Assistant API version, see IBM Cloud Documentation

url

Default value https://api.us-south.assistant.watson.cloud.ibm.com

Watson Assistant API endpoint, see IBM Cloud Documentation

chatRequestProperty

Default value locals.chat

The name of property under app where to attach the chat method

const { chat } = req.app.locals;

messageRequestProperty

Default value message

The name of property under req where to attach the incoming message from WeChat server

const { message } = req;

userRequestProperty

Default value user

The name of property under req where to attach the ID of incoming WeChat user

const { user } = req;

Development

Require

• NodeJS: >=12
• Yarn

Setup

• cp .env.example .env
• yarn install
• yarn dev

Author

• IBM Cognitive Class, IBM Digital Business Group