opaque-proxy/index.mjs

#!/usr/bin/node

import Koa from "koa";
import Router from "@koa/router";
import axios from "axios";

const router = new Router();

const href_regex = /href="\/"/g;

router.get("/", async (ctx) => {
  const url = ctx.query.url;
  const rewrite = ctx.query.url;
  const response = await axios.get(url);
  if (response.data.replace && rewrite) {
    const origin = new URL(url).origin;
    response.data = response.data.replace(href_regex, `href="${origin}/`);
  }
  ctx.body = response.data;
});

const app = new Koa();

app.use(router.routes());

app.listen(8383);
console.log("Listening on port 8383");