cookie.js

/*!
 * cookie
 * Copyright(c) 2012-2014 Roman Shtylman
 * Copyright(c) 2015 Douglas Christopher Wilson
 * MIT Licensed
 */

'use strict';

/**
 * Module exports.
 * @public
 */

exports.parse = parse;

/**
 * Module variables.
 * @private
 */

var decode = decodeURIComponent;
var pairSplitRegExp = /; */;



/**
 * Parse a cookie header.
 *
 * Parse the given cookie header string into an object
 * The object has the various cookies as keys(names) => values
 *
 * @param {string} str
 * @param {object} [options]
 * @return {object}
 * @public
 */

function parse(str, options) {
  if (typeof str !== 'string') {
    throw new TypeError('argument str must be a string');
  }

  var obj = {}
  var opt = options || {};
  var pairs = str.split(pairSplitRegExp);
  var dec = opt.decode || decode;

  for (var i = 0; i < pairs.length; i++) {
    var pair = pairs[i];
    var eq_idx = pair.indexOf('=');

    // skip things that don't look like key=value
    if (eq_idx < 0) {
      continue;
    }

    var key = pair.substr(0, eq_idx).trim()
    var val = pair.substr(++eq_idx, pair.length).trim();

    // quoted values
    if ('"' == val[0]) {
      val = val.slice(1, -1);
    }

    // only assign once
    if (undefined == obj[key]) {
      obj[key] = tryDecode(val, dec);
    }
  }

  return obj;
}


/**
 * Try decoding a string using a decoding function.
 *
 * @param {string} str
 * @param {function} decode
 * @private
 */

function tryDecode(str, decode) {
  try {
    return decode(str);
  } catch (e) {
    return str;
  }
}