opusdev/vector-similarity-api

1'use strict';2 3var parseUrl = require('url').parse;4 5var DEFAULT_PORTS = {6  ftp: 21,7  gopher: 70,8  http: 80,9  https: 443,10  ws: 80,11  wss: 443,12};13 14var stringEndsWith = String.prototype.endsWith || function(s) {15  return s.length <= this.length &&16    this.indexOf(s, this.length - s.length) !== -1;17};18 19/**20 * @param {string|object} url - The URL, or the result from url.parse.21 * @return {string} The URL of the proxy that should handle the request to the22 *  given URL. If no proxy is set, this will be an empty string.23 */24function getProxyForUrl(url) {25  var parsedUrl = typeof url === 'string' ? parseUrl(url) : url || {};26  var proto = parsedUrl.protocol;27  var hostname = parsedUrl.host;28  var port = parsedUrl.port;29  if (typeof hostname !== 'string' || !hostname || typeof proto !== 'string') {30    return '';  // Don't proxy URLs without a valid scheme or host.31  }32 33  proto = proto.split(':', 1)[0];34  // Stripping ports in this way instead of using parsedUrl.hostname to make35  // sure that the brackets around IPv6 addresses are kept.36  hostname = hostname.replace(/:\d*$/, '');37  port = parseInt(port) || DEFAULT_PORTS[proto] || 0;38  if (!shouldProxy(hostname, port)) {39    return '';  // Don't proxy URLs that match NO_PROXY.40  }41 42  var proxy =43    getEnv('npm_config_' + proto + '_proxy') ||44    getEnv(proto + '_proxy') ||45    getEnv('npm_config_proxy') ||46    getEnv('all_proxy');47  if (proxy && proxy.indexOf('://') === -1) {48    // Missing scheme in proxy, default to the requested URL's scheme.49    proxy = proto + '://' + proxy;50  }51  return proxy;52}53 54/**55 * Determines whether a given URL should be proxied.56 *57 * @param {string} hostname - The host name of the URL.58 * @param {number} port - The effective port of the URL.59 * @returns {boolean} Whether the given URL should be proxied.60 * @private61 */62function shouldProxy(hostname, port) {63  var NO_PROXY =64    (getEnv('npm_config_no_proxy') || getEnv('no_proxy')).toLowerCase();65  if (!NO_PROXY) {66    return true;  // Always proxy if NO_PROXY is not set.67  }68  if (NO_PROXY === '*') {69    return false;  // Never proxy if wildcard is set.70  }71 72  return NO_PROXY.split(/[,\s]/).every(function(proxy) {73    if (!proxy) {74      return true;  // Skip zero-length hosts.75    }76    var parsedProxy = proxy.match(/^(.+):(\d+)$/);77    var parsedProxyHostname = parsedProxy ? parsedProxy[1] : proxy;78    var parsedProxyPort = parsedProxy ? parseInt(parsedProxy[2]) : 0;79    if (parsedProxyPort && parsedProxyPort !== port) {80      return true;  // Skip if ports don't match.81    }82 83    if (!/^[.*]/.test(parsedProxyHostname)) {84      // No wildcards, so stop proxying if there is an exact match.85      return hostname !== parsedProxyHostname;86    }87 88    if (parsedProxyHostname.charAt(0) === '*') {89      // Remove leading wildcard.90      parsedProxyHostname = parsedProxyHostname.slice(1);91    }92    // Stop proxying if the hostname ends with the no_proxy host.93    return !stringEndsWith.call(hostname, parsedProxyHostname);94  });95}96 97/**98 * Get the value for an environment variable.99 *100 * @param {string} key - The name of the environment variable.101 * @return {string} The value of the environment variable.102 * @private103 */104function getEnv(key) {105  return process.env[key.toLowerCase()] || process.env[key.toUpperCase()] || '';106}107 108exports.getProxyForUrl = getProxyForUrl;109