external-uri-service.ts

/********************************************************************************
 * Copyright (C) 2019 TypeFox 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 WITH Classpath-exception-2.0
 ********************************************************************************/

import { injectable } from 'inversify';
import URI from '../common/uri';
import { MaybePromise } from '../common/types';
import { Endpoint } from './endpoint';

@injectable()
export class ExternalUriService {

    /**
     * Maps local to remote URLs.
     * Should be no-op if the given URL is not a localhost URL.
     *
     * By default maps to an origin serving Theia.
     *
     * Use `parseLocalhost` to retrieve localhost address and port information.
     */
    resolve(uri: URI): MaybePromise<URI> {
        const localhost = this.parseLocalhost(uri);
        if (localhost) {
            return this.toRemoteUrl(uri, localhost);
        }
        return uri;
    }

    protected toRemoteUrl(uri: URI, localhost: { address: string, port: number }): URI {
        const host = this.toRemoteHost(localhost);
        return new Endpoint({ host }).getRestUrl().withPath(uri.path).withFragment(uri.fragment).withQuery(uri.query);
    }

    protected toRemoteHost(localhost: { address: string, port: number }): string {
        return `${window.location.hostname}:${localhost.port}`;
    }

    parseLocalhost(uri: URI): { address: string, port: number } | undefined {
        if (uri.scheme !== 'http' && uri.scheme !== 'https') {
            return undefined;
        }
        const localhostMatch = /^(localhost|127\.0\.0\.1|0\.0\.0\.0):(\d+)$/.exec(uri.authority);
        if (!localhostMatch) {
            return undefined;
        }
        return {
            address: localhostMatch[1],
            port: +localhostMatch[2],
        };
    }

}