feat: add proxy server

lib/playwright.ts

@@ -1,6 +1,7 @@
 import { firefox } from "npm:playwright-extra";
 import { createStreamResponse } from "@lib/helpers.ts";
 import StealthPlugin from "npm:puppeteer-extra-plugin-stealth";
+import * as env from "@lib/env.ts";
 
 const userAgentStrings = [
   "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.2227.0 Safari/537.36",
@@ -16,9 +17,18 @@ export async function fetchHtmlWithPlaywright(
   streamResponse: ReturnType<typeof createStreamResponse>,
 ): Promise<string> {
   streamResponse.enqueue("booting up playwright");
-  
+
+  const config: Parameters<typeof firefox.launch>[0] = {};
+  if (env.PROXY_SERVER) {
+    config.proxy = {
+      server: env.PROXY_SERVER,
+      username: env.PROXY_USERNAME,
+      password: env.PROXY_PASSWORD,
+    };
+  }
+
   // Launch the Playwright browser
-  const browser = await firefox.launch();
+  const browser = await firefox.launch(config);
 
   streamResponse.enqueue("fetching html");