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location-mapper-service.ts
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location-mapper-service.ts
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/********************************************************************************
* Copyright (C) 2018 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 { inject, injectable, named } from '@theia/core/shared/inversify';
import URI from '@theia/core/lib/common/uri';
import { Endpoint } from '@theia/core/lib/browser';
import { MaybePromise, Prioritizeable } from '@theia/core/lib/common/types';
import { ContributionProvider } from '@theia/core/lib/common/contribution-provider';
import { MiniBrowserEnvironment } from './environment/mini-browser-environment';
/**
* Contribution for the `LocationMapperService`.
*/
export const LocationMapper = Symbol('LocationMapper');
export interface LocationMapper {
/**
* Should return with a positive number if the current contribution can handle the given location.
* The number indicates the priority of the location mapper. If it is not a positive number, it means, the
* contribution cannot handle the location.
*/
canHandle(location: string): MaybePromise<number>;
/**
* Maps the given location.
*/
map(location: string): MaybePromise<string>;
}
/**
* Location mapper service.
*/
@injectable()
export class LocationMapperService {
@inject(ContributionProvider)
@named(LocationMapper)
protected readonly contributions: ContributionProvider<LocationMapper>;
async map(location: string): Promise<string> {
const contributions = await this.prioritize(location);
if (contributions.length === 0) {
return this.defaultMapper()(location);
}
return contributions[0].map(location);
}
protected defaultMapper(): (location: string) => MaybePromise<string> {
return location => `${new Endpoint().httpScheme}//${location}`;
}
protected async prioritize(location: string): Promise<LocationMapper[]> {
const prioritized = await Prioritizeable.prioritizeAll(this.getContributions(), contribution => contribution.canHandle(location));
return prioritized.map(p => p.value);
}
protected getContributions(): LocationMapper[] {
return this.contributions.getContributions();
}
}
/**
* HTTP location mapper.
*/
@injectable()
export class HttpLocationMapper implements LocationMapper {
canHandle(location: string): MaybePromise<number> {
return location.startsWith('http://') ? 1 : 0;
}
map(location: string): MaybePromise<string> {
return location;
}
}
/**
* HTTPS location mapper.
*/
@injectable()
export class HttpsLocationMapper implements LocationMapper {
canHandle(location: string): MaybePromise<number> {
return location.startsWith('https://') ? 1 : 0;
}
map(location: string): MaybePromise<string> {
return location;
}
}
/**
* Location mapper for locations without a scheme.
*/
@injectable()
export class LocationWithoutSchemeMapper implements LocationMapper {
canHandle(location: string): MaybePromise<number> {
return new URI(location).scheme === '' ? 1 : 0;
}
map(location: string): MaybePromise<string> {
return `http://${location}`;
}
}
/**
* `file` URI location mapper.
*/
@injectable()
export class FileLocationMapper implements LocationMapper {
@inject(MiniBrowserEnvironment)
protected readonly miniBrowserEnvironment: MiniBrowserEnvironment;
canHandle(location: string): MaybePromise<number> {
return location.startsWith('file://') ? 1 : 0;
}
map(location: string): MaybePromise<string> {
const uri = new URI(location);
if (uri.scheme !== 'file') {
throw new Error(`Only URIs with 'file' scheme can be mapped to an URL. URI was: ${uri}.`);
}
let rawLocation = uri.path.toString();
if (rawLocation.charAt(0) === '/') {
rawLocation = rawLocation.substr(1);
}
return this.miniBrowserEnvironment.getRandomEndpoint().getRestUrl().resolve(rawLocation).toString();
}
}
/**
* @deprecated since 1.8.0
*/
export class MiniBrowserEndpoint extends Endpoint {
constructor() {
super({ path: 'mini-browser' });
}
}