how-to-make-the-speech-api-call.md

How to make the Speech API call?

• Get a token
• Create SpeechConfig object
• Define the recognition language
• Create an AudioConfig object from microphone stream
• Create a SpeechRecognizer object

Simple Express Server

require('dotenv').config();
const express = require('express');
const axios = require('axios');
const bodyParser = require('body-parser');
const pino = require('express-pino-logger')();

const app = express();
app.use(bodyParser.urlencoded({ extended: false }));
app.use(pino);

app.get('/api/get-speech-token', async (req, res, next) => {
    res.setHeader('Content-Type', 'application/json');
    const speechKey = process.env.SPEECH_KEY;
    const speechRegion = process.env.SPEECH_REGION;

    if (speechKey === 'paste-your-speech-key-here' || speechRegion === 'paste-your-speech-region-here') {
        res.status(400).send('You forgot to add your speech key or region to the .env file.');
    } else {
        const headers = { 
            headers: {
                'Ocp-Apim-Subscription-Key': speechKey,
                'Content-Type': 'application/x-www-form-urlencoded'
            }
        };

        try {
            const tokenResponse = await axios.post(`https://${speechRegion}.api.cognitive.microsoft.com/sts/v1.0/issueToken`, null, headers);
            res.send({ token: tokenResponse.data, region: speechRegion });
        } catch (err) {
            res.status(401).send('There was an error authorizing your speech key.');
        }
    }
});

app.listen(3001, () =>
    console.log('Express server is running on localhost:3001')
);

Token Utility Function

import axios from 'axios';
import Cookie from 'universal-cookie';

export async function getTokenOrRefresh() {
    const cookie = new Cookie();
    const speechToken = cookie.get('speech-token');

    if (speechToken === undefined) {
        try {
            const res = await axios.get('/api/get-speech-token');
            const token = res.data.token;
            const region = res.data.region;
            cookie.set('speech-token', region + ':' + token, {maxAge: 540, path: '/'});

            console.log('Token fetched from back-end: ' + token);
            return { authToken: token, region: region };
        } catch (err) {
            console.log(err.response.data);
            return { authToken: null, error: err.response.data };
        }
    } else {
        console.log('Token fetched from cookie: ' + speechToken);
        const idx = speechToken.indexOf(':');
        return { authToken: speechToken.slice(idx + 1), region: speechToken.slice(0, idx) };
    }
}