bigbluebutton-Github/bigbluebutton-html5/imports/api/users/server/modifiers/handleLockingMic.js

import Users from '/imports/api/users';

// when new lock settings including disableMic are set,
// all viewers that are in the audio bridge with a mic should be muted and locked
export function handleLockingMic(meetingId, newSettings) {
  // send mute requests for the viewer users joined with mic
  let userObject;
  let userObjects = Users.find({
    meetingId: meetingId,
    'user.role': 'VIEWER',
    'user.listenOnly': false,
    'user.locked': true,
    'user.voiceUser.joined': true,
    'user.voiceUser.muted': false,
  }).fetch();

  _userObjectsLength = userObjects.length;
  let results = [];
  for (let i = 0; i < _userObjectsLength; i++) {
    userObject = userObjects[i];
    results.push(Meteor.call('muteUser', meetingId, userObject.userId, userObject.userId,
        userObject.authToken, true)); //true for muted
  }

  return results;
};