feat: auto setup proxy for http requests (#69)

* feat: auto setup proxy for http requests

* Adds dependencies

* Triggers CI again

Co-authored-by: Maël Nison <nison.mael@gmail.com>

README.md

@@ -110,6 +110,8 @@ This command will retrieve the given package manager from the specified archive
 
 - `COREPACK_ROOT` has no functional impact on Corepack itself; it's automatically being set in your environment by Corepack when it shells out to the underlying package managers, so that they can feature-detect its presence (useful for commands like `yarn init`).
 
+- `HTTP_PROXY`, `HTTPS_PROXY`, and `NO_PROXY` are supported through [`node-proxy-agent`](https://github.com/TooTallNate/node-proxy-agent).
+
 ## Contributing
 
 If you want to build corepack yourself, you can build the project like this:

package.json

@@ -44,6 +44,7 @@
     "eslint-plugin-arca": "^0.9.5",
     "jest": "^26.0.0",
     "nock": "^13.0.4",
+    "proxy-agent": "^4.0.1",
     "rimraf": "^3.0.2",
     "semver": "^7.1.3",
     "supports-color": "^7.1.0",

sources/httpUtils.ts

@@ -8,8 +8,12 @@ export async function fetchUrlStream(url: string, options: RequestOptions = {})
 
   const {default: https} = await import(`https`);
 
+  const {default: ProxyAgent} = await import(`proxy-agent`);
+
+  const proxyAgent = new ProxyAgent();
+
   return new Promise<IncomingMessage>((resolve, reject) => {
-    const request = https.get(url, options, response => {
+    const request = https.get(url, {...options, agent: proxyAgent}, response => {
       const statusCode = response.statusCode ?? 500;
       if (!(statusCode >= 200 && statusCode < 300))
         return reject(new Error(`Server answered with HTTP ${statusCode}`));