chore: deprecate + remove verbio, nuance, playht speech vendor support (#144)

* chore: deprecate and remove verbio, nuance speech vendor support

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* chore: also deprecate and remove PlayHT speech vendor

PlayHT was acquired and no longer provides the service.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/get-tts-voices.js

@@ -1,74 +1,8 @@
 const assert = require('assert');
-const {noopLogger, createNuanceClient, createKryptonClient} = require('./utils');
-const getNuanceAccessToken = require('./get-nuance-access-token');
-const getVerbioAccessToken = require('./get-verbio-token');
-const {GetVoicesRequest, Voice} = require('../stubs/nuance/synthesizer_pb');
+const {noopLogger} = require('./utils');
 const ttsGoogle = require('@google-cloud/text-to-speech');
 const { PollyClient, DescribeVoicesCommand } = require('@aws-sdk/client-polly');
 const getAwsAuthToken = require('./get-aws-sts-token');
-const {Pool} = require('undici');
-const { HTTP_TIMEOUT } = require('./config');
-const verbioVoicePool = new Pool('https://us.rest.speechcenter.verbio.com');
-
-const getNuanceVoices = async(client, logger, credentials) => {
-  const {client_id: clientId, secret: secret, nuance_tts_uri} = credentials;
-
-  return new Promise(async(resolve, reject) => {
-    /* get a nuance access token */
-    let token, nuanceClient;
-    try {
-      if (nuance_tts_uri) {
-        nuanceClient = await createKryptonClient(nuance_tts_uri);
-      }
-      else {
-        const access_token = await getNuanceAccessToken(client, logger, clientId, secret, 'tts');
-        token = access_token.access_token;
-        nuanceClient = await createNuanceClient(token);
-      }
-    } catch (err) {
-      logger.error({err}, 'getTtsVoices: error retrieving access token');
-      return reject(err);
-    }
-    /* retrieve all voices */
-    const v = new Voice();
-    const request = new GetVoicesRequest();
-    request.setVoice(v);
-
-    nuanceClient.getVoices(request, (err, response) => {
-      if (err) {
-        logger.error({err, clientId, secret, token}, 'getTtsVoices: error retrieving voices');
-        return reject(err);
-      }
-
-      /* return all the voices that are not restricted and eliminate duplicates */
-      const voices = response.getVoicesList()
-        .map((v) => {
-          return {
-            language: v.getLanguage(),
-            name: v.getName(),
-            model: v.getModel(),
-            gender: v.getGender() === 1 ? 'male' : 'female',
-            restricted: v.getRestricted()
-          };
-        });
-      const v = voices
-        .filter((v) => v.restricted === false)
-        .map((v) => {
-          delete v.restricted;
-          return v;
-        })
-        .sort((a, b) => {
-          if (a.language < b.language) return -1;
-          if (a.language > b.language) return 1;
-          if (a.name < b.name) return -1;
-          return 1;
-        });
-      const arr = [...new Set(v.map((v) => JSON.stringify(v)))]
-        .map((v) => JSON.parse(v));
-      resolve(arr);
-    });
-  });
-};
 
 const getGoogleVoices = async(_client, logger, credentials) => {
   const client = new ttsGoogle.TextToSpeechClient({credentials});
@@ -109,26 +43,6 @@ const getAwsVoices = async(_client, createHash, retrieveHash, logger, credential
   }
 };
 
-const getVerbioVoices = async(client, logger, credentials) => {
-  try {
-    const access_token = await getVerbioAccessToken(client, logger, credentials);
-    const { body} =  await verbioVoicePool.request({
-      path: '/api/v1/voices',
-      method: 'GET',
-      headers: {
-        'Authorization': `Bearer ${access_token.access_token}`,
-        'User-Agent': 'jambonz'
-      },
-      timeout: HTTP_TIMEOUT,
-      followRedirects: false
-    });
-    return await body.json();
-  } catch (err) {
-    logger.info({err}, 'getVerbioVoices - failed to list voices for Verbio');
-    throw err;
-  }
-};
-
 /**
  * Synthesize speech to an mp3 file, and also cache the generated speech
  * in redis (base64 format) for 24 hours so as to avoid unnecessarily paying
@@ -148,19 +62,15 @@ const getVerbioVoices = async(client, logger, credentials) => {
 async function getTtsVoices(client, createHash, retrieveHash, logger, {vendor, credentials}) {
   logger = logger || noopLogger;
 
-  assert.ok(['nuance', 'google', 'aws', 'polly', 'verbio'].includes(vendor),
+  assert.ok(['google', 'aws', 'polly'].includes(vendor),
     `getTtsVoices not supported for vendor ${vendor}`);
 
   switch (vendor) {
-    case 'nuance':
-      return getNuanceVoices(client, logger, credentials);
     case 'google':
       return getGoogleVoices(client, logger, credentials);
     case 'aws':
     case 'polly':
       return getAwsVoices(client, createHash, retrieveHash, logger, credentials);
-    case 'verbio':
-      return getVerbioVoices(client, logger, credentials);
     default:
       break;
   }