generateDirectLineToken.js

const fetch = require('node-fetch');
const { createUserID } = require('./createUserID');

const { DIRECT_LINE_URL = 'https://directline.botframework.com/' } = process.env;

module.exports = {

    generateDirectLineToken: async (userID) => {
        const { DIRECT_LINE_SECRET } = process.env;

        userID || (userID = await createUserID());

        console.log(`Generating Direct Line token using secret "${ DIRECT_LINE_SECRET.substr(0, 3) }...${ DIRECT_LINE_SECRET.substr(-3) }" and user ID "${ userID }"`);

        const cres = await fetch(`${ DIRECT_LINE_URL }v3/directline/tokens/generate`, {
            body: JSON.stringify({ User: { Id: userID } }),
            headers: {
                authorization: `Bearer ${ DIRECT_LINE_SECRET }`,
                'Content-Type': 'application/json'
            },
            method: 'POST'
        });

        if (cres.status === 200) {
            const json = await cres.json();

            if ('error' in json) {
                throw new Error(`Direct Line service responded ${ JSON.stringify(json.error) } while generating new token`);
            } else {
                const { conversationId: conversationID, ...otherJSON } = json;

                return { ...otherJSON, conversationID, userID };
            }
        } else {
            throw new Error(`Direct Line service returned ${ cres.status } while generating new token`);
        }
    }
};