add eleven labs (#240)

* add eleven labs

* wip

* add voices and languages endpoints

lib/utils/speech-utils.js

@@ -203,6 +203,29 @@ const testWellSaidTts = async(logger, credentials) => {
   }
 };
 
+const testElevenlabs = async(logger, credentials) => {
+  const {api_key, model_id} = credentials;
+  try {
+    const post = bent('https://api.elevenlabs.io', 'POST', 'buffer', {
+      'xi-api-key': api_key,
+      'Accept': 'audio/mpeg',
+      'Content-Type': 'application/json'
+    });
+    const mp3 = await post('/v1/text-to-speech/21m00Tcm4TlvDq8ikWAM', {
+      text: 'Hello',
+      model_id,
+      voice_settings: {
+        stability: 0.5,
+        similarity_boost: 0.5
+      }
+    });
+    return mp3;
+  } catch (err) {
+    logger.info({err}, 'synthEvenlabs returned error');
+    throw err;
+  }
+};
+
 const testIbmTts = async(logger, getTtsVoices, credentials) => {
   const {tts_api_key, tts_region} = credentials;
   const voices = await getTtsVoices({vendor: 'ibm', credentials: {tts_api_key, tts_region}});
@@ -251,5 +274,6 @@ module.exports = {
   testDeepgramStt,
   testIbmTts,
   testIbmStt,
-  testSonioxStt
+  testSonioxStt,
+  testElevenlabs
 };