feat: add nuance on-premise (#131)

* feat: add nuance on-premise

* feat: update fetch nuance credential

* fix: update

* fix nuance tts test against on-prem, refactor aws/google tts testing to use speech-utils package

---------

Co-authored-by: Quan HL <quanluuhoang8@gmail.com>
Co-authored-by: Dave Horton <daveh@beachdognet.com>

lib/utils/speech-utils.js

@@ -1,6 +1,4 @@
-const ttsGoogle = require('@google-cloud/text-to-speech');
 const sttGoogle = require('@google-cloud/speech').v1p1beta1;
-const { PollyClient, DescribeVoicesCommand } = require('@aws-sdk/client-polly');
 const { TranscribeClient, ListVocabulariesCommand } = require('@aws-sdk/client-transcribe');
 const { Deepgram } = require('@deepgram/sdk');
 const sdk = require('microsoft-cognitiveservices-speech-sdk');
@@ -34,9 +32,10 @@ const testNuanceStt = async(logger, credentials) => {
   return true;
 };
 
-const testGoogleTts = async(logger, credentials) => {
-  const client = new ttsGoogle.TextToSpeechClient({credentials});
-  await client.listVoices();
+const testGoogleTts = async(logger, getTtsVoices, credentials) => {
+  const voices = await getTtsVoices({vendor: 'google', credentials});
+  return voices;
+
 };
 
 const testGoogleStt = async(logger, credentials) => {
@@ -120,19 +119,10 @@ const testMicrosoftStt = async(logger, credentials) => {
   });
 };
 
-const testAwsTts = async(logger, credentials) => {
+const testAwsTts = async(logger, getTtsVoices, credentials) => {
   try {
-    const {region, accessKeyId, secretAccessKey} = credentials;
-    const client = new PollyClient({
-      region,
-      credentials: {
-        accessKeyId,
-        secretAccessKey
-      }
-    });
-    const command = new DescribeVoicesCommand({LanguageCode: 'en-US'});
-    const response = await client.send(command);
-    return response;
+    const voices = await getTtsVoices({vendor: 'aws', credentials});
+    return voices;
   } catch (err) {
     logger.info({err}, 'testMicrosoftTts - failed to list voices for region ${region}');
     throw err;