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proxy-resolver.ts
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proxy-resolver.ts
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/**********************************************************************
* Copyright (C) 2022 Red Hat, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-License-Identifier: Apache-2.0
***********************************************************************/
import * as http from 'http';
import * as https from 'https';
import * as nodeurl from 'url';
import type { HttpProxyAgentOptions, HttpsProxyAgentOptions } from 'hpagent';
import { HttpProxyAgent, HttpsProxyAgent } from 'hpagent';
import type { Proxy } from './proxy.js';
// Agents usage table
// ------------------------------------
// | Type | Proxy | Server |
// ------------------------------------
// | HttpProxyAgent | HTTP | HTTP |
// ------------------------------------
// | HttpProxyAgent | HTTPS | HTTP |
// ------------------------------------
// | HttpsProxyAgent | HTTP | HTTPS |
// ------------------------------------
// | HttpsProxyAgent | HTTPS | HTTPS |
// ------------------------------------
// Source - https://github.com/delvedor/hpagent/tree/main#usage
function createProxyAgent(secure: boolean, proxyUrl: string) {
const options = {
keepAlive: true,
keepAliveMsecs: 1000,
maxSockets: 256,
maxFreeSockets: 256,
scheduling: 'lifo',
proxy: proxyUrl,
};
return secure
? new HttpsProxyAgent(options as HttpsProxyAgentOptions)
: new HttpProxyAgent(options as HttpProxyAgentOptions);
}
export function getProxyUrl(proxy: Proxy): string | undefined {
if (proxy.isEnabled()) {
// use HTTPS proxy if it is configured, because HTTPS proxy works for both HTTP/HTTPS
// servers
if (proxy.proxy?.httpsProxy) {
return `https://${proxy.proxy?.httpsProxy}`;
}
return `http://${proxy.proxy?.httpProxy}`;
}
}
type ProxyOptions = { agent?: http.Agent | https.Agent };
export function getOptions(proxy: Proxy, secure: boolean): ProxyOptions {
const options: ProxyOptions = {};
const proxyUrl = getProxyUrl(proxy);
if (proxyUrl) {
options.agent = createProxyAgent(secure, proxyUrl);
}
return options;
}
export function createHttpPatch(originals: typeof http | typeof https, proxy: Proxy) {
return {
get: patch(originals.get),
request: patch(originals.request),
};
function patch(original: typeof http.get) {
function patched(
url?: string | nodeurl.URL | null,
options?: http.RequestOptions | null,
callback?: (res: http.IncomingMessage) => void,
): http.ClientRequest {
if (proxy?.isEnabled()) {
if (typeof url !== 'string' && !url?.searchParams) {
callback = <any>options; // eslint-disable-line @typescript-eslint/no-explicit-any
options = url;
url = undefined;
}
if (typeof options === 'function') {
callback = options;
options = undefined;
}
if (!options) {
options = {};
}
if (options.socketPath) {
return original(options, callback);
}
if (options.agent === true) {
throw new Error('Unexpected agent option: true');
}
if (url) {
const parsed = typeof url === 'string' ? new nodeurl.URL(url) : url;
const urlOptions = {
protocol: parsed.protocol,
hostname: parsed.hostname.lastIndexOf('[', 0) === 0 ? parsed.hostname.slice(1, -1) : parsed.hostname,
port: parsed.port,
path: `${parsed.pathname}${parsed.search}`,
};
if (parsed.username || parsed.password) {
options.auth = `${parsed.username}:${parsed.password}`;
}
options = { ...urlOptions, ...options };
} else {
options = { ...options };
}
const host = options.hostname || options.host;
const isLocalhost = !host || host === 'localhost' || host === '127.0.0.1';
if (!isLocalhost) {
options = Object.assign({}, options, getOptions(proxy, options.protocol === 'https:'));
}
return original(options, callback);
}
return original.apply(null, arguments as any); // eslint-disable-line
}
return patched;
}
}
export function createHttpPatchedModules(proxy: Proxy) {
const res = {
http: Object.assign({}, http, createHttpPatch(http, proxy)),
https: Object.assign({}, https, createHttpPatch(https, proxy)),
};
return { ...res, 'node:https': res.https, 'node:http': res.http };
}