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Add build directories
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‎challenges/202312_SECCON_CTF_2023_Finals/misc/whitespace-js/README.md

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@@ -13,7 +13,7 @@ Don't worry, this is not an esolang challenge.
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Launch a challenge server:
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```
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cd files/whitespace-js
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cd build
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docker compose up
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```
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‎challenges/202312_SECCON_CTF_2023_Finals/misc/whitespace-js/build/docker-compose.yml

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services:
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sandbox:
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build: ./sandbox
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restart: unless-stopped
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ports:
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- 3000:3000

‎challenges/202312_SECCON_CTF_2023_Finals/misc/whitespace-js/build/sandbox/Dockerfile

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FROM node:21-slim
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WORKDIR /app
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COPY package.json package-lock.json ./
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RUN npm install
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COPY flag.txt .
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RUN mv flag.txt /flag-$(md5sum flag.txt | cut -c-32).txt
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COPY . .
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USER 404:404
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CMD ["node", "index.js"]

‎challenges/202312_SECCON_CTF_2023_Finals/misc/whitespace-js/build/sandbox/flag.txt

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SECCON{P4querett3_Down_the_Bunburr0ws}

‎challenges/202312_SECCON_CTF_2023_Finals/misc/whitespace-js/build/sandbox/index.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>whitespace.js</title>
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<link rel="stylesheet" href="https://unpkg.com/simpledotcss/simple.min.css">
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</head>
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<body>
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<h1>whitespace.js</h1>
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<div style="display: flex; gap: 1rem;">
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<input id="expr" type="text" placeholder="7 * 7">
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<button id="calc" type="button">Calculate</button>
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</div>
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<pre id="result" style="text-align: center; font-size: 3rem; margin: 1rem 0;"> </pre>
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<script>
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const $ = document.getElementById.bind(document);
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$("calc").addEventListener("click", async () => {
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const expr = $("expr").value;
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if (!expr) return;
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const result = await fetch("/", {
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method: "POST",
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headers: {
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"Content-Type": "application/json",
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},
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body: JSON.stringify({ expr }),
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}).then((r) => r.text());
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$("result").textContent = result;
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});
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</script>
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</body>
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</html>

‎challenges/202312_SECCON_CTF_2023_Finals/misc/whitespace-js/build/sandbox/index.js

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const fs = require("node:fs").promises;
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const execFile = require("node:util").promisify(
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require("node:child_process").execFile
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);
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const app = require("fastify")();
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const PORT = 3000;
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app.get("/", async (req, res) => {
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const html = await fs.readFile("index.html");
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res.type("html").send(html);
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});
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app.post("/", async (req, res) => {
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const { expr } = req.body;
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const proc = await execFile("node", ["whitespace.js", expr], {
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timeout: 2000,
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}).catch((e) => e);
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res.send(proc.killed ? "Timeout" : proc.stdout);
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});
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app.listen({ port: PORT, host: "0.0.0.0" }).catch((err) => {
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app.log.error(err);
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process.exit(1);
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});

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