Download 駅メモ background images

download-ekimemo.mjs

#!/usr/bin/env node

import fs from "node:fs/promises";
import path from "node:path";
import * as prettier from "prettier";

const html = await fetch("https://game.our-rails.ekimemo.com/top/").then((e) => e.text());
const static_versions = html.match(/<script.* src=".*\/v=([^/]+)\/.*app\.js">/)[1];
const static_origin = html.match(/<meta name="app:provider:static_origin" content="([^"]+)"/)[1];
const appJS = html.match(/<script.* src="([^"]+\/app.js)"><\/script>/)[1];
await fs.mkdir(path.join(static_versions), { recursive: true });

let jsText = "";

if (
  await fs
    .access(path.join(static_versions, "app-prettier.js"))
    .then(() => true)
    .catch(() => false)
) {
  jsText = await fs.readFile(path.join(static_versions, "app-prettier.js"), "utf-8");
} else {
  jsText = await fetch(appJS, {
    headers: { Referer: "https://game.our-rails.ekimemo.com/" },
  }).then((e) => e.text());
  await fs.writeFile(path.join(static_versions, "app.js"), jsText);
  jsText = await prettier.format(jsText, { parser: "babel", trailingComma: "none" });
  await fs.writeFile(path.join(static_versions, "app-prettier.js"), jsText);
}

const imageList = JSON.parse(jsText.match(/pwa:\s*({[^}]+})/)[1]);

for (const [name, url] of Object.entries(imageList)) {
  const fileName = path.join(static_versions, name);
  await fs.mkdir(path.dirname(fileName), { recursive: true });
  if (
    await fs
      .access(fileName)
      .then(() => true)
      .catch(() => false)
  ) {
    console.log(`${fileName} already exists, skipping download.`);
    continue;
  }
  console.log(`Downloading ${name}`);
  const response = await fetch(`${static_origin}/v=${static_versions}${url}`, {
    headers: { Referer: "https://game.our-rails.ekimemo.com/" },
  });
  if (!response.ok) {
    console.error(`Failed to download ${name}: ${response.statusText}`);
    continue;
  }
  await fs.writeFile(fileName, Buffer.from(await response.arrayBuffer()));
  await new Promise((resolve) => setTimeout(resolve, 1000 + Math.random() * 1000));
}