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 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 = await fetch("https://game.our-rails.ekimemo.com/api/backgrounds/start_game", {
  headers: { Referer: "https://game.our-rails.ekimemo.com/" },
}).then((e) => e.json());

await fs.writeFile(
  path.join(static_versions, "start_game.json"),
  JSON.stringify(imageList, null, 2),
);

for (const { name_en, url } of imageList.contents.filter(
  (e) => e.end_at !== "9999-07-01 15:00:00",
)) {
  const filePath = path.join(static_versions, path.basename(url));
  await fs.mkdir(path.dirname(filePath), { recursive: true });
  if (
    await fs
      .access(filePath)
      .then(() => true)
      .catch(() => false)
  ) {
    console.log(`${filePath} already exists, skipping download.`);
    continue;
  }
  console.log(`Downloading ${name_en}`);
  const response = await fetch(url, {
    headers: { Referer: "https://game.our-rails.ekimemo.com/" },
  });
  if (!response.ok) {
    console.error(`Failed to download ${name_en}: ${response.statusText}`);
    continue;
  }
  await fs.writeFile(filePath, Buffer.from(await response.arrayBuffer()));
  await new Promise((resolve) => setTimeout(resolve, 1000 + Math.random() * 1000));
}