Differential updates

ts/updater/got.ts

@@ -0,0 +1,50 @@
+// Copyright 2019-2022 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { StrictOptions as GotOptions } from 'got';
+import config from 'config';
+import ProxyAgent from 'proxy-agent';
+
+import * as packageJson from '../../package.json';
+import { getUserAgent } from '../util/getUserAgent';
+
+export const GOT_CONNECT_TIMEOUT = 2 * 60 * 1000;
+export const GOT_LOOKUP_TIMEOUT = 2 * 60 * 1000;
+export const GOT_SOCKET_TIMEOUT = 2 * 60 * 1000;
+
+export function getProxyUrl(): string | undefined {
+  return process.env.HTTPS_PROXY || process.env.https_proxy;
+}
+
+export function getCertificateAuthority(): string {
+  return config.get('certificateAuthority');
+}
+
+export function getGotOptions(): GotOptions {
+  const certificateAuthority = getCertificateAuthority();
+  const proxyUrl = getProxyUrl();
+  const agent = proxyUrl
+    ? {
+        http: new ProxyAgent(proxyUrl),
+        https: new ProxyAgent(proxyUrl),
+      }
+    : undefined;
+
+  return {
+    agent,
+    https: {
+      certificateAuthority,
+    },
+    headers: {
+      'Cache-Control': 'no-cache',
+      'User-Agent': getUserAgent(packageJson.version),
+    },
+    timeout: {
+      connect: GOT_CONNECT_TIMEOUT,
+      lookup: GOT_LOOKUP_TIMEOUT,
+
+      // This timeout is reset whenever we get new data on the socket
+      socket: GOT_SOCKET_TIMEOUT,
+    },
+  };
+}