'use strict';

var parseUrl = require('url').parse;

var DEFAULT_PORTS = {
  ftp: 21,
  gopher: 70,
  http: 80,
  https: 443,
  ws: 80,
  wss: 443,
};

var stringEndsWith = String.prototype.endsWith || function(s) {
  return s.length <= this.length &&
    this.indexOf(s, this.length - s.length) !== -1;
};

/**
 * @param {string|object} url - The URL, or the result from url.parse.
 * @return {string} The URL of the proxy that should handle the request to the
 *  given URL. If no proxy is set, this will be an empty string.
 */
function getProxyForUrl(url) {
  var parsedUrl = typeof url === 'string' ? parseUrl(url) : url || {};
  var proto = parsedUrl.protocol;
  var hostname = parsedUrl.host;
  var port = parsedUrl.port;
  if (typeof hostname !== 'string' || !hostname || typeof proto !== 'string') {
    return '';  // Don't proxy URLs without a valid scheme or host.
  }

  proto = proto.split(':', 1)[0];
  // Stripping ports in this way instead of using parsedUrl.hostname to make
  // sure that the brackets around IPv6 addresses are kept.
  hostname = hostname.replace(/:\d*$/, '');
  port = parseInt(port) || DEFAULT_PORTS[proto] || 0;
  if (!shouldProxy(hostname, port)) {
    return '';  // Don't proxy URLs that match NO_PROXY.
  }

  var proxy =
    getEnv('npm_config_' + proto + '_proxy') ||
    getEnv(proto + '_proxy') ||
    getEnv('npm_config_proxy') ||
    getEnv('all_proxy');
  if (proxy && proxy.indexOf('://') === -1) {
    // Missing scheme in proxy, default to the requested URL's scheme.
    proxy = proto + '://' + proxy;
  }
  return proxy;
}

/**
 * Determines whether a given URL should be proxied.
 *
 * @param {string} hostname - The host name of the URL.
 * @param {number} port - The effective port of the URL.
 * @returns {boolean} Whether the given URL should be proxied.
 * @private
 */
function shouldProxy(hostname, port) {
  var NO_PROXY =
    (getEnv('npm_config_no_proxy') || getEnv('no_proxy')).toLowerCase();
  if (!NO_PROXY) {
    return true;  // Always proxy if NO_PROXY is not set.
  }
  if (NO_PROXY === '*') {
    return false;  // Never proxy if wildcard is set.
  }

  return NO_PROXY.split(/[,\s]/).every(function(proxy) {
    if (!proxy) {
      return true;  // Skip zero-length hosts.
    }
    var parsedProxy = proxy.match(/^(.+):(\d+)$/);
    var parsedProxyHostname = parsedProxy ? parsedProxy[1] : proxy;
    var parsedProxyPort = parsedProxy ? parseInt(parsedProxy[2]) : 0;
    if (parsedProxyPort && parsedProxyPort !== port) {
      return true;  // Skip if ports don't match.
    }

    if (!/^[.*]/.test(parsedProxyHostname)) {
      // No wildcards, so stop proxying if there is an exact match.
      return hostname !== parsedProxyHostname;
    }

    if (parsedProxyHostname.charAt(0) === '*') {
      // Remove leading wildcard.
      parsedProxyHostname = parsedProxyHostname.slice(1);
    }
    // Stop proxying if the hostname ends with the no_proxy host.
    return !stringEndsWith.call(hostname, parsedProxyHostname);
  });
}

/**
 * Get the value for an environment variable.
 *
 * @param {string} key - The name of the environment variable.
 * @return {string} The value of the environment variable.
 * @private
 */
function getEnv(key) {
  return process.env[key.toLowerCase()] || process.env[key.toUpperCase()] || '';
}

exports.getProxyForUrl = getProxyForUrl;

.NET Framework

Project Request

ProjectC

Vehicle Maintenance

Movie Navigator

Customers Exchange

ATM

.NET Core

Mail Daemon

Custom

Buns of code

PHP

Mediabox

Loan Castle

Content Management

Laravel

Phone Check

Frontend

Forex Wall

Business projects

Certification Center

Amerikas Auto

Pet projects

Geolocation Assistant

Web Dynamics

Blackball

Good old times

DOS Clock

BrainOut

Airport Administrator

Atomizer

Mediabox