feat support multi speech credential with diff labels and same vendor (#218)

* feat support multi speech credential with diff labels and same vendor

* fix review comment

* wip

* fix review comments

* update verb spec version

lib/routes/api/speech-credentials.js

@@ -207,6 +207,7 @@ router.post('/', async(req, res) => {
       use_for_stt,
       use_for_tts,
       vendor,
+      label
     } = req.body;
     const account_sid = req.user.account_sid || req.body.account_sid;
     const service_provider_sid = req.user.service_provider_sid ||
@@ -221,11 +222,21 @@ router.post('/', async(req, res) => {
       }
     }
 
+    // Check if vendor and label is already used for account or SP
+    if (label) {
+      const existingSpeech = await SpeechCredential.isAvailableVendorAndLabel(
+        service_provider_sid, account_sid, vendor, label);
+      if (existingSpeech.length > 0) {
+        throw new DbErrorUnprocessableRequest(`Label ${label} is already in use for another speech credential`);
+      }
+    }
+
     const encrypted_credential = encryptCredential(req.body);
     const uuid = await SpeechCredential.make({
       account_sid,
       service_provider_sid,
       vendor,
+      label,
       use_for_tts,
       use_for_stt,
       credential: encrypted_credential