index.js

/**
 * Module dependencies.
 */

var debug = require('debug')('cookie');

/**
 * Set or get cookie `name` with `value` and `options` object.
 *
 * @param {String} name
 * @param {String} value
 * @param {Object} options
 * @return {Mixed}
 * @api public
 */

module.exports = function(name, value, options){
  switch (arguments.length) {
    case 3:
    case 2:
      return set(name, value, options);
    case 1:
      return get(name);
    default:
      return all();
  }
};

/**
 * Set cookie `name` to `value`.
 *
 * @param {String} name
 * @param {String} value
 * @param {Object} options
 * @api private
 */

function set(name, value, options) {
  options = options || {};
  var str = encode(name) + '=' + encode(value);

  if (null == value) options.maxage = -1;

  if (options.maxage) {
    options.expires = new Date(+new Date + options.maxage);
  }

  if (options.path) str += '; path=' + options.path;
  if (options.domain) str += '; domain=' + options.domain;
  if (options.expires) str += '; expires=' + options.expires.toUTCString();
  if (options.secure) str += '; secure';

  document.cookie = str;
}

/**
 * Return all cookies.
 *
 * @return {Object}
 * @api private
 */

function all() {
  var str;
  try {
    str = document.cookie;
  } catch (err) {
    if (typeof console !== 'undefined' && typeof console.error === 'function') {
      console.error(err.stack || err);
    }
    return {};
  }
  return parse(str);
}

/**
 * Get cookie `name`.
 *
 * @param {String} name
 * @return {String}
 * @api private
 */

function get(name) {
  return all()[name];
}

/**
 * Parse cookie `str`.
 *
 * @param {String} str
 * @return {Object}
 * @api private
 */

function parse(str) {
  var obj = {};
  var pairs = str.split(/ *; */);
  var pair;
  if ('' == pairs[0]) return obj;
  for (var i = 0; i < pairs.length; ++i) {
    pair = pairs[i].split('=');
    obj[decode(pair[0])] = decode(pair[1]);
  }
  return obj;
}

/**
 * Encode.
 */

function encode(value){
  try {
    return encodeURIComponent(value);
  } catch (e) {
    debug('error `encode(%o)` - %o', value, e)
  }
}

/**
 * Decode.
 */

function decode(value) {
  try {
    return decodeURIComponent(value);
  } catch (e) {
    debug('error `decode(%o)` - %o', value, e)
  }
}