Google apps script to hide incoming email and deliver it on a schedule

schedule_inbox.gs

var LABEL_NAME = 'inbox-holding'

function setup() {
  // Create a label to put paused messages in
  // First go through all the labels and check that it doesn't already exist
  var label = null;
  allLabels = Gmail.Users.Labels.list('me');
  for (var i = 0; i < allLabels.labels.length; i++) {
    if(allLabels.labels[i].name == LABEL_NAME){
      label = allLabels.labels[i];
      break; // Found it, just quit now
    }
  }

  if(label == null){ // Didn't find it, so create it
    label = Gmail.Users.Labels.create({'name':LABEL_NAME,
                                       'labelListVisibility':'labelHide'},
                                      'me');
  }

  // Add a filter that automatically puts all incoming messages into this label
  // and archives them so they don't appear in the inbox
  var filter = Gmail.Users.Settings.Filters.create({'id':'schedule_inbox_filter',
                                                    'criteria':{
                                                      'from':'*',
                                                      'query':'label:inbox'
                                                    },
                                                    'action':{
                                                      'addLabelIds':[label.id],
                                                      'removeLabelIds':['INBOX']
                                                    }}, 
                                                   'me');

  // Set up triggers to run the deliver() method at the desired times
  // TODO: allow separate schedule for weekends, probably by moving this to a
  // data structure rather than hard-coding it.
  ScriptApp.newTrigger("deliver")
    .timeBased()
    .atHour(7)
    .nearMinute(40)
    .everyDays(1)
    .create();

  ScriptApp.newTrigger("deliver")
    .timeBased()
    .atHour(13)
    .nearMinute(0)
    .everyDays(1)
    .create();

  ScriptApp.newTrigger("deliver")
    .timeBased()
    .atHour(17)
    .nearMinute(0)
    .everyDays(1)
    .create();
}

// Deliver mail stored in the special label to the inbox
// Scheduled for specific times of day, and will occur +/- 15 minutes of that time
function deliver() {
  // Find the label
  allLabels = Gmail.Users.Labels.list('me');
  var label = null;
  for (var i = 0; i < allLabels.labels.length; i++) {
    if(allLabels.labels[i].name == LABEL_NAME){
      label = allLabels.labels[i];
      break;
    }
  }
  if(label != null){
    // Get all the threads with the label
    allThreads = Gmail.Users.Threads.list('me', { 'labelIds':[label.id] } );
    
    // If there are no messages, we're done
    if(allThreads.resultSizeEstimate == 0){
      return;
    }
    
    Logger.log(new Date() + ": " + allThreads.threads.length + " messages delivered");
    
    // Now move each of these threads to the inbox and remove the label
    for (var i = 0; i < allThreads.threads.length; i++) {
      Gmail.Users.Threads.modify({'addLabelIds': ['INBOX'],
                                  'removeLabelIds': [label.id]},
                                 'me', allThreads.threads[i].id);
    }
  }
  else{
    Logger.log("Couldn't find scheduled inbox label!");
  }
}