feat proxy

.env.example

@@ -1,2 +1,5 @@
 PORT=3000
 HOST="0.0.0.0"
+
+PROXY_DOMAIN="localhost"
+PROXY_PORT=3001

src/index.ts

@@ -1,6 +1,7 @@
 import "dotenv/config";
 import fastify from "fastify";
 import { readdirSync } from "fs";
+import "./proxy.ts";
 
 const app = fastify();
 

src/proxy.ts

@@ -0,0 +1,39 @@
+import fastify from "fastify";
+import { getContainer } from "./utils/containers.ts";
+
+const app = fastify();
+
+app.all(
+  "/*",
+  { constraints: { host: new RegExp(`.*\.${process.env.PROXY_DOMAIN}`) } },
+  async (req) => {
+    const subdomains = req.headers.host.split(".");
+
+    const port = subdomains[0].startsWith("port-")
+      ? subdomains[0].slice(5)
+      : 80;
+
+    const containerName = subdomains[subdomains[0].startsWith("port-") ? 1 : 0];
+
+    const { NetworkSettings } = await getContainer(containerName).inspect();
+    const { IPAddress: ip } = NetworkSettings;
+
+    const proxyRequest = await fetch(`http://${ip}:${port}${req.url}`, {
+      headers: req.headers,
+      method: req.method,
+    });
+
+    const proxyResponse = await proxyRequest.text();
+    return proxyResponse;
+  },
+);
+
+await app.listen({
+  port: Number(process.env.PROXY_PORT),
+  host: process.env.HOST,
+});
+
+console.log(
+  "Proxy ready on",
+  `http://${process.env.HOST}:${Number(process.env.PROXY_PORT)}`,
+);