feat: add nuance, riva, ibm

lib/utils.js

@@ -0,0 +1,25 @@
+const crypto = require('crypto');
+/**
+ * Future TODO: cache recently used connections to providers
+ * to avoid connection overhead during a call.
+ * Will need to periodically age them out to avoid memory leaks.
+ */
+//const nuanceClientMap = new Map();
+
+function makeSynthKey({vendor, language, voice, engine = '', text}) {
+  const hash = crypto.createHash('sha1');
+  hash.update(`${language}:${vendor}:${voice}:${engine}:${text}`);
+  return `tts:${hash.digest('hex')}`;
+}
+
+const noopLogger = {
+  info: () => {},
+  debug: () => {},
+  error: () => {}
+};
+
+
+module.exports = {
+  makeSynthKey,
+  noopLogger
+};