/*---------------------------------------------------------------------------------------------

* Copyright (c) Microsoft Corporation. All rights reserved.

* Licensed under the MIT License. See License.txt in the project root for license information.

*--------------------------------------------------------------------------------------------*/

import { readFileSync } from 'fs';

import { homedir } from 'os';

import { join } from 'path';

import Logger from '../../common/logger';

import { baseResolver, chainResolvers, ConfigResolver, resolverFromConfig, sshParse } from '../browser/ssh';

export class Resolvers {

static default = chainResolvers(baseResolver, resolverFromConfigFile());

static fromConfig(conf: string) {

return chainResolvers(baseResolver, resolverFromConfig(conf));

}

static current = Resolvers.default;

}

/**

* Parse and resolve an SSH url. Resolves host aliases using the configuration

* specified by ~/.ssh/config, if present.

*

* Examples:

*

* resolve("git@github.com:Microsoft/vscode")

* {

* Host: 'github.com',

* HostName: 'github.com',

* User: 'git',

* path: 'Microsoft/vscode',

* }

*

* resolve("hub:queerviolet/vscode", resolverFromConfig("Host hub\n HostName github.com\n User git\n"))

* {

* Host: 'hub',

* HostName: 'github.com',

* User: 'git',

* path: 'queerviolet/vscode',

* }

*

* @param {string} url the url to parse

* @param {ConfigResolver?} resolveConfig ssh config resolver (default: from ~/.ssh/config)

* @returns {Config}

*/

export const resolve = (url: string, resolveConfig = Resolvers.current) => {

const config = sshParse(url);

return config && resolveConfig(config);

};

function resolverFromConfigFile(configPath = join(homedir(), '.ssh', 'config')): ConfigResolver | undefined {

try {

const config = readFileSync(configPath).toString();

return resolverFromConfig(config);

} catch (error) {

Logger.warn(`${configPath}: ${error.message}`);

}

}