add support for ibm speech credentials, and test for ibm tts (#82)

* add support for ibm speech credentials, and test for ibm tts

* add stt testing for ibm watson

lib/utils/speech-utils.js

@@ -179,6 +179,35 @@ const testWellSaidTts = async(logger, credentials) => {
   }
 };
 
+const testIbmTts = async(logger, getTtsVoices, credentials) => {
+  const {tts_api_key, tts_region} = credentials;
+  const voices = await getTtsVoices({vendor: 'ibm', credentials: {api_key: tts_api_key, region: tts_region}});
+  return voices;
+};
+
+const testIbmStt = async(logger, credentials) => {
+  const {stt_api_key, stt_region} = credentials;
+  const SpeechToTextV1 = require('ibm-watson/speech-to-text/v1');
+  const { IamAuthenticator } = require('ibm-watson/auth');
+  const speechToText = new SpeechToTextV1({
+    authenticator: new IamAuthenticator({
+      apikey: stt_api_key
+    }),
+    serviceUrl: `https://api.${stt_region}.speech-to-text.watson.cloud.ibm.com`
+  });
+  return new Promise((resolve, reject) => {
+    speechToText.listModels()
+      .then((speechModels) => {
+        logger.debug({speechModels}, 'got IBM speech models');
+        return resolve();
+      })
+      .catch((err) => {
+        logger.info({err}, 'failed to get speech models');
+        reject(err);
+      });
+  });
+};
+
 const testWellSaidStt = async(logger, credentials) => {
   //TODO
   return true;
@@ -195,5 +224,7 @@ module.exports = {
   testWellSaidStt,
   testNuanceTts,
   testNuanceStt,
-  testDeepgramStt
+  testDeepgramStt,
+  testIbmTts,
+  testIbmStt
 };