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https://scm.univ-tours.fr/22107988t/rappaurio-sae501_502.git
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109 lines
3.3 KiB
JavaScript
109 lines
3.3 KiB
JavaScript
'use strict';
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var parseUrl = require('url').parse;
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var DEFAULT_PORTS = {
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ftp: 21,
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gopher: 70,
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http: 80,
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https: 443,
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ws: 80,
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wss: 443,
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};
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var stringEndsWith = String.prototype.endsWith || function(s) {
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return s.length <= this.length &&
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this.indexOf(s, this.length - s.length) !== -1;
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};
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/**
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* @param {string|object} url - The URL, or the result from url.parse.
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* @return {string} The URL of the proxy that should handle the request to the
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* given URL. If no proxy is set, this will be an empty string.
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*/
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function getProxyForUrl(url) {
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var parsedUrl = typeof url === 'string' ? parseUrl(url) : url || {};
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var proto = parsedUrl.protocol;
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var hostname = parsedUrl.host;
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var port = parsedUrl.port;
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if (typeof hostname !== 'string' || !hostname || typeof proto !== 'string') {
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return ''; // Don't proxy URLs without a valid scheme or host.
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}
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proto = proto.split(':', 1)[0];
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// Stripping ports in this way instead of using parsedUrl.hostname to make
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// sure that the brackets around IPv6 addresses are kept.
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hostname = hostname.replace(/:\d*$/, '');
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port = parseInt(port) || DEFAULT_PORTS[proto] || 0;
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if (!shouldProxy(hostname, port)) {
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return ''; // Don't proxy URLs that match NO_PROXY.
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}
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var proxy =
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getEnv('npm_config_' + proto + '_proxy') ||
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getEnv(proto + '_proxy') ||
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getEnv('npm_config_proxy') ||
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getEnv('all_proxy');
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if (proxy && proxy.indexOf('://') === -1) {
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// Missing scheme in proxy, default to the requested URL's scheme.
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proxy = proto + '://' + proxy;
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}
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return proxy;
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}
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/**
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* Determines whether a given URL should be proxied.
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*
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* @param {string} hostname - The host name of the URL.
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* @param {number} port - The effective port of the URL.
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* @returns {boolean} Whether the given URL should be proxied.
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* @private
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*/
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function shouldProxy(hostname, port) {
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var NO_PROXY =
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(getEnv('npm_config_no_proxy') || getEnv('no_proxy')).toLowerCase();
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if (!NO_PROXY) {
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return true; // Always proxy if NO_PROXY is not set.
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}
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if (NO_PROXY === '*') {
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return false; // Never proxy if wildcard is set.
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}
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return NO_PROXY.split(/[,\s]/).every(function(proxy) {
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if (!proxy) {
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return true; // Skip zero-length hosts.
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}
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var parsedProxy = proxy.match(/^(.+):(\d+)$/);
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var parsedProxyHostname = parsedProxy ? parsedProxy[1] : proxy;
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var parsedProxyPort = parsedProxy ? parseInt(parsedProxy[2]) : 0;
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if (parsedProxyPort && parsedProxyPort !== port) {
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return true; // Skip if ports don't match.
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}
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if (!/^[.*]/.test(parsedProxyHostname)) {
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// No wildcards, so stop proxying if there is an exact match.
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return hostname !== parsedProxyHostname;
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}
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if (parsedProxyHostname.charAt(0) === '*') {
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// Remove leading wildcard.
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parsedProxyHostname = parsedProxyHostname.slice(1);
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}
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// Stop proxying if the hostname ends with the no_proxy host.
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return !stringEndsWith.call(hostname, parsedProxyHostname);
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});
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}
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/**
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* Get the value for an environment variable.
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*
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* @param {string} key - The name of the environment variable.
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* @return {string} The value of the environment variable.
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* @private
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*/
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function getEnv(key) {
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return process.env[key.toLowerCase()] || process.env[key.toUpperCase()] || '';
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}
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exports.getProxyForUrl = getProxyForUrl;
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