Fix API password gathering

lib/api.js

@@ -23,6 +23,11 @@ const buildQuery = params => {
   return query;
 };
 
+const getPassword = (role, options) => {
+  return options.password && options.password[role] ?
+    options.password[role] : config.api.password[role];
+};
+
 const getURL = (action, params, options) => {
   const query = buildQuery(params);
   const checksum = calculateChecksum(action, query, options);
@@ -44,8 +49,8 @@ const getCreateURL = (options) => {
   const params = {
     meetingID: options.room || config.url.meeting.name,
     record: true,
-    moderatorPW: options.password.moderator || config.api.password.moderator,
-    attendeePW: options.password.attendee || config.api.password.attendee,
+    moderatorPW: getPassword('moderator', options),
+    attendeePW: getPassword('attendee', options),
   };
 
   return getURL('create', params, options);
@@ -54,16 +59,16 @@ const getCreateURL = (options) => {
 const getEndURL = (options) => {
   const params = {
     meetingID: options.room || config.url.meeting.name,
-    password: options.password.moderator || config.api.password.moderator,
+    password: getPassword('moderator', options),
   };
 
   return getURL('end', params, options);
 };
 
 const getJoinURL = (username, options) => {
-  let password = options.password.attendee || config.api.password.attendee;
+  let password = getPassword('attendee', options);
   if (options.moderator !== undefined ? options.moderator : config.url.moderator.value) {
-    password = options.password.moderator || config.api.password.moderator;
+    password = getPassword('moderator', options);
   }
 
   const params = {