feat: clear account tts cache (#176)

* feat: clear account tts cache

* get parsed account_sid

lib/routes/api/tts-cache.js

@@ -1,14 +1,28 @@
 const router = require('express').Router();
+const {
+  parseAccountSid
+} = require('./utils');
 
 router.delete('/', async(req, res) => {
   const {purgeTtsCache} = req.app.locals;
-  await purgeTtsCache();
+  const account_sid = parseAccountSid(req);
+  if (account_sid) {
+    await purgeTtsCache({account_sid});
+  } else {
+    await purgeTtsCache();
+  }
   res.sendStatus(204);
 });
 
 router.get('/', async(req, res) => {
   const {getTtsSize} = req.app.locals;
-  const size = await getTtsSize();
+  const account_sid = parseAccountSid(req);
+  let size = 0;
+  if (account_sid) {
+    size = await getTtsSize(`tts:${account_sid}:*`);
+  } else {
+    size = await getTtsSize();
+  }
   res.status(200).json({size});
 });