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109 lines
3.6 KiB
TypeScript
109 lines
3.6 KiB
TypeScript
/**
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* Copyright (c) Microsoft Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import type { IncomingMessage, Server } from 'http';
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import type { Socket } from 'net';
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import createProxy from 'proxy';
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export class TestProxy {
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readonly PORT: number;
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readonly URL: string;
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connectHosts: string[] = [];
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requestUrls: string[] = [];
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private readonly _server: Server;
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private readonly _sockets = new Set<Socket>();
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private _handlers: { event: string, handler: (...args: any[]) => void }[] = [];
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static async create(port: number): Promise<TestProxy> {
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const proxy = new TestProxy(port);
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await new Promise<void>(f => proxy._server.listen(port, f));
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return proxy;
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}
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private constructor(port: number) {
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this.PORT = port;
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this.URL = `http://localhost:${port}`;
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this._server = createProxy();
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this._server.on('connection', socket => this._onSocket(socket));
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}
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async stop(): Promise<void> {
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this.reset();
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for (const socket of this._sockets)
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socket.destroy();
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this._sockets.clear();
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await new Promise(x => this._server.close(x));
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}
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forwardTo(port: number, options?: { skipConnectRequests: boolean }) {
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this._prependHandler('request', (req: IncomingMessage) => {
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this.requestUrls.push(req.url);
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const url = new URL(req.url);
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url.host = `localhost:${port}`;
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req.url = url.toString();
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});
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this._prependHandler('connect', (req: IncomingMessage) => {
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// If using this proxy at the browser-level, you'll want to skip trying to
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// MITM connect requests otherwise, unless the system/browser is configured
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// to ignore HTTPS errors (or the host has been configured to trust the test
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// certs), Playwright will crash in funny ways. (e.g. CR Headful tries to connect
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// to accounts.google.com as part of its starup routine and fatally complains of "Invalid method encountered".)
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if (options?.skipConnectRequests)
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return;
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this.connectHosts.push(req.url);
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req.url = `localhost:${port}`;
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});
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}
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setAuthHandler(handler: (req: IncomingMessage) => boolean) {
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(this._server as any).authenticate = (req: IncomingMessage, callback) => {
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try {
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callback(null, handler(req));
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} catch (e) {
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callback(e, false);
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}
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};
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}
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reset() {
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this.connectHosts = [];
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this.requestUrls = [];
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for (const { event, handler } of this._handlers)
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this._server.removeListener(event, handler);
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this._handlers = [];
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(this._server as any).authenticate = undefined;
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}
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private _prependHandler(event: string, handler: (...args: any[]) => void) {
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this._handlers.push({ event, handler });
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this._server.prependListener(event, handler);
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}
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private _onSocket(socket: Socket) {
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this._sockets.add(socket);
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// ECONNRESET and HPE_INVALID_EOF_STATE are legit errors given
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// that tab closing aborts outgoing connections to the server.
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socket.on('error', (error: any) => {
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if (error.code !== 'ECONNRESET' && error.code !== 'HPE_INVALID_EOF_STATE')
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throw error;
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});
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socket.once('close', () => this._sockets.delete(socket));
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}
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}
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