@theia/core/src/electron-node/hosting/electron-ws-origin-validator.ts

Theia is a cloud & desktop IDE framework implemented in TypeScript.

// *****************************************************************************
// Copyright (C) 2020 Ericsson and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// http://www.eclipse.org/legal/epl-2.0.
//
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License v. 2.0 are satisfied: GNU General Public License, version 2
// with the GNU Classpath Exception which is available at
// https://www.gnu.org/software/classpath/license.html.
//
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0
// *****************************************************************************

import * as http from 'http';
import { inject, injectable } from 'inversify';
import { BackendRemoteService } from '../../node/remote/backend-remote-service';
import { WsRequestValidatorContribution } from '../../node/ws-request-validators';

@injectable()
export class ElectronWsOriginValidator implements WsRequestValidatorContribution {

    @inject(BackendRemoteService)
    protected readonly backendRemoteService: BackendRemoteService;

    allowWsUpgrade(request: http.IncomingMessage): boolean {
        // If we are running as a remote server, requests will come from an http endpoint
        if (this.backendRemoteService.isRemoteServer()) {
            return true;
        }
        // On Electron the main page is served from the `file` protocol.
        // We don't expect the requests to come from anywhere else.
        return request.headers.origin === 'file://';
    }
}