baucis-decorator-guests/index.js

Automatically creates unauthenticated users as guests and reserves guest names.

'use strict';

// modules
var baucis = require('baucis');
var mongoose = require('mongoose');
var ObjectId = mongoose.Types.ObjectId;
var auth = require('baucis-decorator-auth');

/**
 * Automatically creates unauthenticated users as guests, and reserves guest 
 * names.
 * 
 * @param {Object} app Express application
 * @api public
 */
exports = module.exports = guests;
function guests (app) {
  return function () {
    // if not logged in, create guest
    app.use(function (req, res, next) {
      if (req.session.userId) {
        next();
      } else {
        createGuest.call(this, function (err, props) {
          if (err) {
            next(err);
          } else {
            auth.setUserId.call(this, req.session, props);
            next();
          }
        });
      }   
    }.bind(this));

    // reserve Guest names
    this.request('post put', function (req, res, next) {
      if (/^Guest[0-9]+$/i.test(req.body && req.body.name)) {
        next(baucis.Error.Forbidden({message: 'Guest names are reserved.'}));
      } else {
        next();
      }
    });
  }
}


/**
 * Creates a guest.
 *
 * @param {Function} callback
 * @api public
 */
exports.createGuest = createGuest;
function createGuest (callback) {
  var Model = this.model();

  Model.count(function (err, count) {
    var guest;
    var guestId;
    var guestLevel;
    var guestProps;
    
    if (err) {
      console.log('Error getting guest count:', err);
      callback(err);
      return;
    }
    
    guestId = ObjectId();
    guestLevel = 0;
    guestProps = {};
    guestProps._id = guestId;
    guestProps.createdBy = guestId;
    guestProps.modifiedBy = guestId;
    guestProps.name = 'Guest'+count;
    guestProps.email = guestId+'@loggur.com';
    guestProps.editors = [guestId];
    guestProps.level = guestLevel;
    
    guest = new Model(guestProps);
    guest.save(function (err, userDoc) {
      if (!err && userDoc.id != guestId) {
        err = new Error('ID mismatch?');
      }
      if (err) {
        console.log('Error creating guest:', err);
        callback(err);
      } else {
        callback(null, userDoc);
      }
    });
  }); 
}