Convert text to mp3 using AWS Polly

aws-say.js

const aws = require('aws-sdk');
aws.config.loadFromPath('aws.json');

const locale = 'it-IT';

const fs = require('fs');

const pollyClient = new aws.Polly({
	signatureVersion: 'v4',
	region: 'eu-west-1'
});

function getVoice() {
	return new Promise((resolve, reject) => {
		pollyClient.describeVoices({
			LanguageCode: locale
		}, async(err, data) => {
			if (err != null) {
				if (err.code !== 'ValidationException') {
					console.error(TAG, err);
					return reject(err);
				}
			}

			voice = data.Voices.find((v) => { 
				return v.Gender == "Female"; 
			});

			return resolve(voice);
		});
	});
}

function getAudioFile(id, text) {
	return new Promise(async(resolve, reject) => {
		console.debug('request', { text });

		const ssml = /<speak>/.test(text);

		let voice = await getVoice();
		pollyClient.synthesizeSpeech({
			VoiceId: voice.Id,
			Text: text,
			TextType: ssml ? 'ssml' : 'text',
			OutputFormat: 'mp3',
		}, (err, data) => {
			if (err) {
				console.error(err);
				return reject(err);
			}

			let file = __dirname + '/' + id + '.mp3';
			fs.writeFile(file, data.AudioStream, function(err) {
				if (err) {
					throw err;
				}

				console.log('File saved to ' + file);
			});
		});

	});
};

getAudioFile(process.argv[1], process.argv[2]);