index.js

/**
 * Module dependencies.
 */

var url = require('url'),
  qs = require('querystring');

/**
 * Helpers method
 *
 * @param {String} name
 * @return {Function}
 * @api public
 */

function helpers(name) {
  return function(req, res, next) {
    res.locals.appName = name || 'App';
    res.locals.title = name || 'App';
    res.locals.req = req;
    res.locals.isActive = function(link) {
      if (link === '/') {
        return req.url === '/' ? 'active' : '';
      } else {
        return req.url.indexOf(link) !== -1 ? 'active' : '';
      }
    };
    res.locals.formatDate = formatDate;
    res.locals.formatDatetime = formatDatetime;
    res.locals.stripScript = stripScript;
    res.locals.createPagination = createPagination(req);

    if (typeof req.flash !== 'undefined') {
      res.locals.info = req.flash('info');
      res.locals.errors = req.flash('error');
      res.locals.success = req.flash('success');
      res.locals.warning = req.flash('warning');
    }

    /**
     * Render mobile views
     *
     * If the request is coming from a mobile/tablet device, it will check if
     * there is a .mobile.ext file and it that exists it tries to render it.
     *
     * Refer https://github.com/madhums/nodejs-express-mongoose-demo/issues/39
     * For the implementation refer the above app
     */

    // For backward compatibility check if `app` param has been passed
    var ua = req.header('user-agent');
    var fs = require('fs');

    res._render = res.render;
    req.isMobile = /mobile/i.test(ua);

    res.render = function(template, locals, cb) {
      var view = template + '.mobile.' + req.app.get('view engine');
      var file = req.app.get('views') + '/' + view;

      if (/mobile/i.test(ua) && fs.existsSync(file)) {
        res._render(view, locals, cb);
      } else {
        res._render(template, locals, cb);
      }
    };

    next();
  };
}

module.exports = helpers;

/**
 * Pagination helper
 *
 * @param {Number} pages
 * @param {Number} page
 * @return {String}
 * @api private
 */

function createPagination(req) {
  return function createPagination(pages, page, liClass, anchorClass) {
    var params = qs.parse(url.parse(req.url).query);
    var str = '';

    params.page = 1;
    var clas = (page == 1 && 'active') || '';

    for (var p = 1; p <= pages; p++) {
      params.page = p;
      clas = (page == p && 'active') || '';

      var href = '?' + qs.stringify(params);

      str += `<li class="${liClass} ${clas}"><a class="${anchorClass}" href="${href}">${p}</a></li>`;
    }

    return str;
  };
}

/**
 * Format date helper
 *
 * @param {Date} date
 * @return {String}
 * @api private
 */

function formatDate(date) {
  date = new Date(date);
  var monthNames = [
    'Jan',
    'Feb',
    'Mar',
    'Apr',
    'May',
    'June',
    'July',
    'Aug',
    'Sep',
    'Oct',
    'Nov',
    'Dec'
  ];
  return (
    monthNames[date.getMonth()] +
    ' ' +
    date.getDate() +
    ', ' +
    date.getFullYear()
  );
}

/**
 * Format date time helper
 *
 * @param {Date} date
 * @return {String}
 * @api private
 */

function formatDatetime(date) {
  date = new Date(date);
  var hour = date.getHours();
  var minutes =
    date.getMinutes() < 10
      ? '0' + date.getMinutes().toString()
      : date.getMinutes();

  return formatDate(date) + ' ' + hour + ':' + minutes;
}

/**
 * Strip script tags
 *
 * @param {String} str
 * @return {String}
 * @api private
 */

function stripScript(str) {
  return str.replace(/<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi, '');
}