index.js

const express = require('express');
const { Configuration, OpenAIApi } = require("openai");
require('dotenv').config();


const configuration = new Configuration({
    apiKey: process.env.OPENAI_API_KEY,
});
const openai = new OpenAIApi(configuration);


const textGeneration = async (prompt) => {

    try {
        const response = await openai.createCompletion({
            model: 'text-davinci-003',
            prompt: `Human: ${prompt}\nAI: `,
            temperature: 0.9,
            max_tokens: 500,
            top_p: 1,
            frequency_penalty: 0,
            presence_penalty: 0.6,
            stop: ['Human:', 'AI:']
        });
    
        return {
            status: 1,
            response: `${response.data.choices[0].text}`
        };
    } catch (error) {
        return {
            status: 0,
            response: ''
        };
    }
};


const webApp = express();

const PORT = process.env.PORT;

webApp.use(express.urlencoded({ extended: true }));
webApp.use(express.json());
webApp.use((req, res, next) => {
    console.log(`Path ${req.path} with Method ${req.method}`);
    next();
});


webApp.get('/', (req, res) => {
    res.sendStatus(200);
});


webApp.post('/dialogflow', async (req, res) => {
    
    let action = req.body.queryResult.action;
    let queryText = req.body.queryResult.queryText;

    if (action === 'input.unknown') {
        let result = await textGeneration(queryText);
        if (result.status == 1) {
            res.send(
                {
                    fulfillmentText: result.response
                }
            );
        } else {
            res.send(
                {
                    fulfillmentText: `Sorry, I'm not able to help with that.`
                }
            );
        }
    } else {
        res.send(
            {
                fulfillmentText: `No handler for the action ${action}.`
            }
        );
    }
});


webApp.listen(PORT, () => {
    console.log(`Server is up and running at ${PORT}`);
});