Merge from vscode 79a1f5a5ca0c6c53db617aa1fa5a2396d2caebe2

extensions/github/src/auth.ts

@@ -0,0 +1,60 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { AuthenticationSession, authentication, window } from 'vscode';
+import { Agent, globalAgent } from 'https';
+import { Octokit } from '@octokit/rest';
+import { httpsOverHttp } from 'tunnel';
+import { URL } from 'url';
+
+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;
+	}
+}
+
+const scopes = ['repo'];
+
+export async function getSession(): Promise<AuthenticationSession> {
+	const authenticationSessions = await authentication.getSessions('github', scopes);
+
+	if (authenticationSessions.length) {
+		return await authenticationSessions[0];
+	} else {
+		return await authentication.login('github', scopes);
+	}
+}
+
+let _octokit: Promise<Octokit> | undefined;
+
+export function getOctokit(): Promise<Octokit> {
+	if (!_octokit) {
+		_octokit = getSession().then(async session => {
+			const token = await session.getAccessToken();
+			const agent = getAgent();
+
+			return new Octokit({
+				request: { agent },
+				userAgent: 'GitHub VSCode',
+				auth: `token ${token}`
+			});
+		}).then(null, async err => {
+			_octokit = undefined;
+			throw err;
+		});
+	}
+
+	return _octokit;
+}
+