preserve-qs/lib/index.js

Preserve querystrings during redirect and creating new URLs for Node.js and browser environments (supports Lad, Koa, Express, and Connect)

'use strict';

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

var URL = require('url-parse');

var preserveQs = function preserveQs(ctx, str) {
  var override = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
  var blacklist = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : [];

  if (Array.isArray(override)) {
    blacklist = override;
    override = {};
  }

  var originalUrl = void 0;

  // support Node.js (Koa/Express) and browser environments
  if (typeof ctx === 'string') originalUrl = ctx;else if ((typeof ctx === 'undefined' ? 'undefined' : _typeof(ctx)) === 'object') {
    if (_typeof(ctx.request) === 'object' && typeof ctx.request.originalUrl === 'string') {
      ;
      originalUrl = ctx.request.originalUrl;
    } else if (typeof ctx.originalUrl === 'string') {
      ;
      originalUrl = ctx.originalUrl;
    } else if (_typeof(ctx.location) === 'object' && typeof ctx.location.pathname === 'string' && typeof ctx.location.search === 'string') originalUrl = ctx.location.pathname + ctx.location.search;
  }

  // throw an error if we didn't have a valid original URL passed
  if (!originalUrl || typeof originalUrl !== 'string') throw new Error('URL could not be parsed');

  // throw an error if we didn't have a valid string passed
  if (!str || typeof str !== 'string') throw new Error('New path must be a string');

  originalUrl = new URL(originalUrl);

  var url = new URL(str);
  var path = url.origin === 'null' ? url.pathname : '' + url.origin + url.pathname;
  var query = Object.assign({}, URL.qs.parse(originalUrl.query), URL.qs.parse(url.query), override);
  if (Array.isArray(blacklist) && blacklist.length > 0) blacklist.forEach(function (prop) {
    delete query[prop];
  });
  var qs = URL.qs.stringify(query, true);
  return path + qs;
};

module.exports = preserveQs;
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