merge of features from hosted branch (#7)

major merge of features from the hosted branch that was created temporarily during the initial launch of jambonz.org

lib/utils/speech-utils.js

@@ -0,0 +1,60 @@
+const ttsGoogle = require('@google-cloud/text-to-speech');
+const sttGoogle = require('@google-cloud/speech').v1p1beta1;
+const Polly = require('aws-sdk/clients/polly');
+const AWS = require('aws-sdk');
+const fs = require('fs');
+
+const testGoogleTts = async(logger, credentials) => {
+  const client = new ttsGoogle.TextToSpeechClient({credentials});
+  await client.listVoices();
+};
+
+const testGoogleStt = async(logger, credentials) => {
+  const client = new sttGoogle.SpeechClient({credentials});
+  const config = {
+    sampleRateHertz: 8000,
+    languageCode: 'en-US',
+    model: 'default',
+  };
+  const audio = {
+    content: fs.readFileSync(`${__dirname}/../../data/test_audio.wav`).toString('base64'),
+  };
+  const request = {
+    config: config,
+    audio: audio,
+  };
+
+  // Detects speech in the audio file
+  const [response] = await client.recognize(request);
+  if (!Array.isArray(response.results) || 0 === response.results.length) {
+    throw new Error('failed to transcribe speech');
+  }
+};
+
+const testAwsTts = (logger, credentials) => {
+  const polly = new Polly(credentials);
+  return new Promise((resolve, reject) => {
+    polly.describeVoices({LanguageCode: 'en-US'}, (err, data) => {
+      if (err) return reject(err);
+      resolve();
+    });
+  });
+};
+
+const testAwsStt = (logger, credentials) => {
+  const transcribeservice = new AWS.TranscribeService(credentials);
+  return new Promise((resolve, reject) => {
+    transcribeservice.listVocabularies((err, data) => {
+      if (err) return reject(err);
+      logger.info({data}, 'retrieved language models');
+      resolve();
+    });
+  });
+};
+
+module.exports = {
+  testGoogleTts,
+  testGoogleStt,
+  testAwsTts,
+  testAwsStt
+};