HORIZON PROJECT

/*!

 * cookie

 * Copyright(c) 2012-2014 Roman Shtylman

 * Copyright(c) 2015 Douglas Christopher Wilson

 * MIT Licensed

 */

'use strict';

/**

 * Module exports.

 * @public

 */

exports.parse = parse;

exports.serialize = serialize;

/**

 * Module variables.

 * @private

 */

var decode = decodeURIComponent;

var encode = encodeURIComponent;

var pairSplitRegExp = /; */;

/**

 * RegExp to match field-content in RFC 7230 sec 3.2

 *

 * field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ]

 * field-vchar   = VCHAR / obs-text

 * obs-text      = %x80-FF

 */

var fieldContentRegExp = /^[\u0009\u0020-\u007e\u0080-\u00ff]+$/;

/**

 * 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;

}

/**

 * Serialize data into a cookie header.

 *

 * Serialize the a name value pair into a cookie string suitable for

 * http headers. An optional options object specified cookie parameters.

 *

 * serialize('foo', 'bar', { httpOnly: true })

 *   => "foo=bar; httpOnly"

 *

 * @param {string} name

 * @param {string} val

 * @param {object} [options]

 * @return {string}

 * @public

 */

function serialize(name, val, options) {

  var opt = options || {};

  var enc = opt.encode || encode;

  if (typeof enc !== 'function') {

    throw new TypeError('option encode is invalid');

  }

  if (!fieldContentRegExp.test(name)) {

    throw new TypeError('argument name is invalid');

  }

  var value = enc(val);

  if (value && !fieldContentRegExp.test(value)) {

    throw new TypeError('argument val is invalid');

  }

  var str = name + '=' + value;

  if (null != opt.maxAge) {

    var maxAge = opt.maxAge - 0;

    if (isNaN(maxAge)) throw new Error('maxAge should be a Number');

    str += '; Max-Age=' + Math.floor(maxAge);

  }

  if (opt.domain) {

    if (!fieldContentRegExp.test(opt.domain)) {

      throw new TypeError('option domain is invalid');

    }

    str += '; Domain=' + opt.domain;

  }

  if (opt.path) {

    if (!fieldContentRegExp.test(opt.path)) {

      throw new TypeError('option path is invalid');

    }

    str += '; Path=' + opt.path;

  }

  if (opt.expires) {

    if (typeof opt.expires.toUTCString !== 'function') {

      throw new TypeError('option expires is invalid');

    }

    str += '; Expires=' + opt.expires.toUTCString();

  }

  if (opt.httpOnly) {

    str += '; HttpOnly';

  }

  if (opt.secure) {

    str += '; Secure';

  }

  if (opt.sameSite) {

    var sameSite = typeof opt.sameSite === 'string'

      ? opt.sameSite.toLowerCase() : opt.sameSite;

    switch (sameSite) {

      case true:

        str += '; SameSite=Strict';

        break;

      case 'lax':

        str += '; SameSite=Lax';

        break;

      case 'strict':

        str += '; SameSite=Strict';

        break;

      default:

        throw new TypeError('option sameSite is invalid');

    }

  }

  return str;

}

/**

 * 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;

  }

}