import { window } from 'vscode';

import { Agent, globalAgent } from 'https';

import { URL } from 'url';

import { httpsOverHttp } from 'tunnel';

export const agent = getAgent();

/**

* Return an https agent for the given proxy URL, or return the

* global https agent if the URL was empty or invalid.

*

* @param {string} url the proxy URL, (default: `process.env.HTTPS_PROXY`)

* @returns {https.Agent}

*/

function getAgent(url: string | undefined = process.env.HTTPS_PROXY): Agent {

if (!url) { return globalAgent; }

try {

const { hostname, port, username, password } = new URL(url);

const auth = username && password && `${username}:${password}`;

return httpsOverHttp({proxy: { host: hostname, port, proxyAuth: auth}});

} catch (e) {

window.showErrorMessage(`HTTPS_PROXY environment variable ignored: ${e.message}`);

return globalAgent;

}

}