v1.6.0/conference call upgrade

- anyone can start call
- colision check for calls
- better error handing for calls

functions/modules/tokenValidator.js

@@ -1,6 +1,9 @@
 const VoxeetSecret = require('../VoxeetSecret.json');
+const admin = require('firebase-admin');
 const fetch = require('node-fetch');
+
 module.exports = async (req, res) => {
+  const bodyData = JSON.parse(req.body);
   const { key, secret } = VoxeetSecret;
   const credentials = Buffer.from(encodeURI(key) + ':' + encodeURI(secret)).toString('base64');
   const headers = {
@@ -14,8 +17,48 @@ module.exports = async (req, res) => {
     body: JSON.stringify({
       grant_type: 'client_credentials',
     }),
-  })
-    .then((oauthResponse) => oauthResponse.json())
-    .catch((err) => res.status(500).send(err));
-  if (oauth) res.status(200).send(oauth);
+  }).then((oauthResponse) => oauthResponse.json())
+    .catch((err) => res.status(500).send({err, message: 'Unable to generate token for call'}));
+
+  const [exists, conferencePending, conference, adminOnly, adminUid] = await admin
+  .firestore()
+  .collection('rooms')
+  .doc(req.params.partyName)
+  .get()
+  .then(snap => {
+    const data = snap.exists ? snap.data() : {};
+    return [snap.exists, data.conferencePending, data.conference, data.adminOnly, data.adminUid];
+  });
+
+  if (exists === true) {
+    if (conference === undefined || conference === null) {
+      if (conferencePending === undefined || conferencePending === null) {
+        if (!adminOnly || (adminOnly && (adminUid === bodyData.uid)) ) {
+          await admin
+          .firestore()
+          .collection('rooms')
+          .doc(req.params.partyName)
+          .update({
+            conferencePending: bodyData.uid
+          });
+          await admin
+            .firestore()
+            .collection('rooms')
+            .doc(req.params.partyName)
+            .collection('messages')
+            .add({
+              uid: '<system>',
+              name: '',
+              text: 'A call session is being created (will be available soon).',
+              time: new Date(),
+          });
+        }
+      }
+    }
+    if (oauth) res.status(200).send(oauth);
+  } else {
+    res.status(400).send({ message: 'Unable to get party for call.' });
+  }
+
+  return;
 };