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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import * as http from 'http';
import { URL } from 'url';
import * as fs from 'fs';
import * as path from 'path';
import { randomBytes } from 'crypto';
function sendFile(res: http.ServerResponse, filepath: string) {
fs.readFile(filepath, (err, body) => {
if (err) {
console.error(err);
res.writeHead(404);
res.end();
} else {
res.writeHead(200, {
'content-length': body.length,
});
res.end(body);
}
});
}
interface IOAuthResult {
code: string;
state: string;
}
interface ILoopbackServer {
/**
* If undefined, the server is not started yet.
*/
port: number | undefined;
/**
* The nonce used
*/
nonce: string;
/**
* The state parameter used in the OAuth flow.
*/
state: string | undefined;
/**
* Starts the server.
* @returns The port to listen on.
* @throws If the server fails to start.
* @throws If the server is already started.
*/
start(): Promise<number>;
/**
* Stops the server.
* @throws If the server is not started.
* @throws If the server fails to stop.
*/
stop(): Promise<void>;
/**
* Returns a promise that resolves to the result of the OAuth flow.
*/
waitForOAuthResponse(): Promise<IOAuthResult>;
}
export class LoopbackAuthServer implements ILoopbackServer {
private readonly _server: http.Server;
private readonly _resultPromise: Promise<IOAuthResult>;
private _startingRedirect: URL;
public nonce = randomBytes(16).toString('base64');
public port: number | undefined;
public set state(state: string | undefined) {
if (state) {
this._startingRedirect.searchParams.set('state', state);
} else {
this._startingRedirect.searchParams.delete('state');
}
}
public get state(): string | undefined {
return this._startingRedirect.searchParams.get('state') ?? undefined;
}
constructor(serveRoot: string, startingRedirect: string) {
if (!serveRoot) {
throw new Error('serveRoot must be defined');
}
if (!startingRedirect) {
throw new Error('startingRedirect must be defined');
}
this._startingRedirect = new URL(startingRedirect);
let deferred: { resolve: (result: IOAuthResult) => void; reject: (reason: any) => void };
this._resultPromise = new Promise<IOAuthResult>((resolve, reject) => deferred = { resolve, reject });
this._server = http.createServer((req, res) => {
const reqUrl = new URL(req.url!, `http://${req.headers.host}`);
switch (reqUrl.pathname) {
case '/signin': {
const receivedNonce = (reqUrl.searchParams.get('nonce') ?? '').replace(/ /g, '+');
if (receivedNonce !== this.nonce) {
res.writeHead(302, { location: `/?error=${encodeURIComponent('Nonce does not match.')}` });
res.end();
}
res.writeHead(302, { location: this._startingRedirect.toString() });
res.end();
break;
}
case '/callback': {
const code = reqUrl.searchParams.get('code') ?? undefined;
const state = reqUrl.searchParams.get('state') ?? undefined;
const nonce = (reqUrl.searchParams.get('nonce') ?? '').replace(/ /g, '+');
if (!code || !state || !nonce) {
res.writeHead(400);
res.end();
return;
}
if (this.state !== state) {
res.writeHead(302, { location: `/?error=${encodeURIComponent('State does not match.')}` });
res.end();
throw new Error('State does not match.');
}
if (this.nonce !== nonce) {
res.writeHead(302, { location: `/?error=${encodeURIComponent('Nonce does not match.')}` });
res.end();
throw new Error('Nonce does not match.');
}
deferred.resolve({ code, state });
res.writeHead(302, { location: '/' });
res.end();
break;
}
// Serve the static files
case '/':
sendFile(res, path.join(serveRoot, 'index.html'));
break;
default:
// substring to get rid of leading '/'
sendFile(res, path.join(serveRoot, reqUrl.pathname.substring(1)));
break;
}
});
}
public start(): Promise<number> {
return new Promise<number>((resolve, reject) => {
if (this._server.listening) {
throw new Error('Server is already started');
}
const portTimeout = setTimeout(() => {
reject(new Error('Timeout waiting for port'));
}, 5000);
this._server.on('listening', () => {
const address = this._server.address();
if (typeof address === 'string') {
this.port = parseInt(address);
} else if (address instanceof Object) {
this.port = address.port;
} else {
throw new Error('Unable to determine port');
}
clearTimeout(portTimeout);
// set state which will be used to redirect back to vscode
this.state = `http://127.0.0.1:${this.port}/callback?nonce=${encodeURIComponent(this.nonce)}`;
resolve(this.port);
});
this._server.on('error', err => {
reject(new Error(`Error listening to server: ${err}`));
});
this._server.on('close', () => {
reject(new Error('Closed'));
});
this._server.listen(0, '127.0.0.1');
});
}
public stop(): Promise<void> {
return new Promise<void>((resolve, reject) => {
if (!this._server.listening) {
throw new Error('Server is not started');
}
this._server.close((err) => {
if (err) {
reject(err);
} else {
resolve();
}
});
});
}
public waitForOAuthResponse(): Promise<IOAuthResult> {
return this._resultPromise;
}
}
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