impress-2020/api/assetProxy.js

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import util from "util";
import stream from "stream";
import fetch from "node-fetch";
const streamPipeline = util.promisify(stream.pipeline);
const VALID_URL_PATTERNS = [
/^http:\/\/images\.neopets\.com\/items\/[a-zA-Z0-9_ -]+\.gif$/,
/^http:\/\/images\.neopets\.com\/cp\/(bio|items)\/data\/[0-9]{3}\/[0-9]{3}\/[0-9]{3}\/[a-f0-9_]+\/[a-zA-Z0-9_\-\/]+\.(svg|png|js)(\?[0-9]*)?$/,
/^http:\/\/images\.neopets\.com\/cp\/(bio|items)\/swf\/[0-9]{3}\/[0-9]{3}\/[0-9]{3}\/[a-f0-9_]+\.swf$/,
];
export default async (req, res) => {
const urlToProxy = req.query.url;
if (!urlToProxy) {
return res
.status(400)
.send("Bad request: Must provide `?url` in the query string");
}
if (!VALID_URL_PATTERNS.some((p) => urlToProxy.match(p))) {
return res
.status(400)
.send("Bad request: URL did not match any valid patterns");
}
console.debug("[assetProxy] 💌 Sending: %s", urlToProxy);
const proxyRes = await fetch(urlToProxy);
console.debug(
`[assetProxy] %s %s: %s`,
proxyRes.ok ? "✅" : "🛑",
`${proxyRes.status} ${proxyRes.statusText}`.padStart(7, " "),
urlToProxy
);
res.status(proxyRes.status);
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res.setHeader("Content-Type", proxyRes.headers.get("Content-Type"));
res.setHeader("Cache-Control", proxyRes.headers.get("Cache-Control"));
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res.setHeader("ETag", proxyRes.headers.get("ETag"));
res.setHeader("Last-Modified", proxyRes.headers.get("Last-Modified"));
if (!proxyRes.headers.get("Content-Encoding")) {
// If the content is not encoded (I think their images generally aren't?),
// stream the body directly, to speed things up a bit.
res.setHeader("Content-Length", proxyRes.headers.get("Content-Length"));
await streamPipeline(proxyRes.body, res);
} else {
// Otherwise, I don't immediately know how to stream encoded content, so,
// let's just await the full body and send it the normal way.
const buffer = await proxyRes.buffer();
res.send(buffer);
}
};