guest/lib/linux.js

Lets you enable or disable guest account access on Linux, Mac and Windows.

var fs = require('fs');

var file = '/etc/lightdm/lightdm.conf';

var get_current = function(cb) {
  fs.readFile(file, function(err, data) {
    if (err) return cb(err);

    var match = data.toString().match(/allow-guest=(.+)/);
    if (!match)
      return cb(null, null, data);

    var bool = match[1];
    cb(null, bool, data);
  });
}

var toggle = function(enabling, cb) {
  get_current(function(err, current, data) {
    if (err) return cb(err);

    if (current === null) { // not there, so let's append it to the bottom
      var str = data.toString().trim() + '\nallow-guest=' + enabling.toString() + '\n';
    } else if (current.toString() == enabling.toString()) { 
      return cb() // nothing to do
    } else { 
      var str = data.toString().replace(/allow-guest=(.*)/, 'allow-guest=' + enabling.toString());
    }

    fs.writeFile(file, str, cb);
  })
}

exports.check = function(cb) {
  get_current(function(err, current) {
    if (err) return cb(err);

    // if no value is found, the default behaviour is to show the guest user option.
    var disabled = current !== null && current.toString() == 'false';
    cb(null, !disabled);
  })
}

exports.enable = function(cb) {
  toggle(true, cb);
}

exports.disable = function(cb) {
  toggle(false, cb);
}