[Google Apps Script] Change Owner of Google Drive Folder and All It's Contents

code.gs

var allFolders = [];
var allFiles = [];

function changeOwnership() {
  
  var newOwner = "new.owner@gmail.com";
  var folderIdToChange = "0B7uECGWKsTGu712INmZSYzReSBE";
  
  // update the global allFiles and allFolders arrays
  allFolders.push(DriveApp.getFolderById(folderIdToChange));
  recursivelyGetAllFilesAndFolders(folderIdToChange);
  
  Logger.log("Got all of the folders and files. Updating ownership...");
  
  for (var i in allFolders) {
    try {
      allFolders[i].setOwner(newOwner);
    }
    catch(e) {
      Logger.log("Problem updating ownership for the file " + allFolders[i].getName() + ". Continuing...");
    }
  }
  for (var i in allFiles) {
    try {
      allFiles[i].setOwner(newOwner);
    }
    catch(e) {
      Logger.log("Problem updating ownership for the file " + allFiles[i].getName() + ". Continuing...");
    }
  }
  
  Logger.log("Updating complete! Pew pew.");
  
  return;
  
}

function recursivelyGetAllFilesAndFolders(parent) {
  
  parent = DriveApp.getFolderById(parent);
  var childFolders = parent.getFolders();
  
  while (childFolders.hasNext()) {
    
    var childFolder = childFolders.next();
    allFolders.push(childFolder);
    
    var files = childFolder.getFiles();
    
    while (files.hasNext()) {
      allFiles.push(files.next());
    }
    
    // Recursive call for any sub-folders
    recursivelyGetAllFilesAndFolders(childFolder.getId());
    
  }
  
}