File Permissions and Sharing Settings in Google Drive

If you want to know who has access to your files in Google Drive there is the following script by Amit Agarwal.:

 /*   
    
    
  ======================================  
  Who Can See Your Files in Google Drive   
  ======================================  
    
  Written by Amit Agarwal on 09/11/2013   
    
  Tutorial :: http://labnol.org/?p=28237  
    
    
 */  
    
    
    
 function ScanGoogleDrive() {  
    
  // Get all files in your Google Drive  
  var files = DriveApp.getFiles();  
    
  var msg = "";  
  var report = "";  
    
  while (files.hasNext()) {  
     
   try {  
      
    var file = files.next();  
      
    // Get the Sharing Permissions of a file  
    var access = file.getSharingAccess();  
      
    // Is a file privately shared with specific users     
    if (access == DriveApp.Access.PRIVATE) {  
     var viewers = file.getViewers();     
     var editors = file.getEditors();  
     if (editors.length || viewers.length) {  
      var view="", edit="";  
        
      // Find who has "view" permissions for that file  
      for (var i=0; i<viewers.length; i++) {          
       if (view.length) {  
        view += ", ";  
       }  
       view += viewers[i].getName() + " " + viewers[i].getEmail();  
      }  
        
      // Find who has "edit" permissions for that file  
      for (var i=0; i<editors.length; i++) {          
       if (edit.length) {  
        edit += ", ";  
       }  
       edit += editors[i].getName() + " " + editors[i].getEmail();  
      }  
      report += "<tr><td style='padding:5px;'><a href='" + file.getUrl() + "'>" + file.getName()  
       + "</a></td><td style='padding:5px'>" + view + "</td><td style='padding:5px'>" + edit + "</td></tr>";                   
     }  
     // Or is the file public, shared with anyone on the Internet  
    } else if ((access == DriveApp.Access.ANYONE_WITH_LINK) || (access == DriveApp.Access.PRIVATE)) {  
     var permission = file.getSharingPermission();  
       
     // Is the file shared with "Edit" permissions?  
     if (permission == DriveApp.Permission.EDIT) {  
      permission = "Public";  
     } else {  
      permission = "";  
     }        
     report += "<tr><td style='padding:5px'><a href='" + file.getUrl() + "'>" + file.getName()   
      + "</a></td><td style='padding:5px'>Public</td><td style='padding:5px'>" + permission + "</td></tr>";            
    }  
   }  
   catch (e) {  
    Logger.log(e.toString());  
   }  
  }   
    
  // Send the report as HTML Email  
  report ="<table><tr><th'>File Name</th><th>Who can view</th><th>Who can edit</th></tr>" + report + "</table>";  
  MailApp.sendEmail(Session.getActiveUser().getEmail(),  
           "Google Drive - File Sharing Report", report, {htmlBody: report});  
 }