initial changes for microsoft speech support (#11)

* initial changes for microsoft speech support

* remove very wordy log message

lib/utils/speech-utils.js

@@ -2,6 +2,7 @@ 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 bent = require('bent');
 const fs = require('fs');
 
 const testGoogleTts = async(logger, credentials) => {
@@ -52,9 +53,33 @@ const testAwsStt = (logger, credentials) => {
   });
 };
 
+const testMicrosoftTts = async(logger, credentials) => {
+  const {api_key, region} = credentials;
+
+  if (!api_key) throw new Error('testMicrosoftTts: credentials are missing api_key');
+  if (!region) throw new Error('testMicrosoftTts: credentials are missing region');
+  try {
+    const getJSON = bent('json', {
+      'Ocp-Apim-Subscription-Key': api_key
+    });
+    const response = await getJSON(`https://${region}.tts.speech.microsoft.com/cognitiveservices/voices/list`);
+    return response;
+  } catch (err) {
+    logger.info({err}, `testMicrosoftTts - failed to list voices for region ${region}`);
+    throw err;
+  }
+};
+
+const testMicrosoftStt = async(logger, credentials) => {
+  //TODO
+  return true;
+};
+
 module.exports = {
   testGoogleTts,
   testGoogleStt,
   testAwsTts,
-  testAwsStt
+  testAwsStt,
+  testMicrosoftTts,
+  testMicrosoftStt
 };