feat: support for outbound proxy

README.md

@@ -39,3 +39,14 @@ Instructions for both actions can be found in the README doc in the sgid-server
    </div>
 1. The "Login with Singpass App" interacts with the production sgid-server, whereas the "Staging" and "Development" links interact with the staging server and the local server respectively.
 1. To test the sgid-test-app further, utilize sgid-mock-extension (https://github.com/datagovsg/sgid-mock-extension).
+
+## Outbound proxy
+The app will use an outbound http/https proxy if the following environment variables are defined:
+
+   - GLOBAL\_AGENT\_HTTP\_PROXY
+   - GLOBAL\_AGENT\_HTTPS\_PROXY
+   - http\_proxy
+   - https\_proxy
+   - HTTP\_PROXY
+   - HTTPS\_PROXY
+

index.ts

@@ -5,6 +5,8 @@ import { PORT } from './config'
 import { callback } from './routes/callback'
 import { home } from './routes/home'
 import { profile } from './routes/profile'
+import { bootstrap } from 'global-agent'
+import {getProxyAndSetupEnv} from "./proxyhelper"
 
 const app = express()
 
@@ -17,4 +19,10 @@ app.get('/', home)
 app.get('/callback', callback)
 app.get('/profile', profile)
 
+let proxyAddress = getProxyAndSetupEnv();
+bootstrap()
+if (proxyAddress) {
+    global.GLOBAL_AGENT.HTTP_PROXY = proxyAddress
+}
+
 app.listen(PORT, () => console.log(`listening on port ${PORT}`))