65 lines
1.7 KiB
TypeScript
65 lines
1.7 KiB
TypeScript
import iconv from "iconv-lite";
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import getRawBody from "raw-body";
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import { promisify } from "util";
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import { inflate } from "zlib";
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import type { RequestHandler } from "express";
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const inflateAsync = promisify(inflate);
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export const DFIRequestResponse: RequestHandler = async (req, res, next) => {
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if (Number(req.headers["content-length"] ?? 0) === 0) {
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next();
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return;
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}
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const isUsingDfi = req.headers.pragma?.toUpperCase() === "DFI";
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const rawBody = await getRawBody(req, { encoding: "utf-8" });
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let body: string;
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if (isUsingDfi) {
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const compressedBuffer = Buffer.from(rawBody, "base64");
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const buffer = await inflateAsync(compressedBuffer);
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body = buffer.toString("utf-8").trim();
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} else {
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body = rawBody.trim();
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}
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// Keys and values are not URL escaped.
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// This should be fine. I think.
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// eslint-disable-next-line require-atomic-updates
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req.body = Object.fromEntries(body.split("&").map((s) => s.split("=")));
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const originalSend = res.send;
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res.send = (params) => {
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const body =
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typeof params === "object"
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? `${Object.entries(params)
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.map(([k, v]) => `${k}=${v}`)
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.join("&")}\n`
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: params;
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const encoding = req.body.encode ?? "EUC-JP";
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const encodedBody = iconv.encode(body, encoding);
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res.header("Content-Type", `text/plain; charset=${encoding}`);
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// TODO: I don't know what black magic SEGA did, but I have been woefully
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// unable to DFI-encode my responses...
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return originalSend.apply(res, [encodedBody]);
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// if (req.headers.pragma?.toUpperCase() !== "DFI") {
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// return originalSend.apply(res, [encodedBody]);
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// }
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// res.header("Pragma", "DFI");
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// return originalSend.apply(res, [deflateSync(encodedBody).toString("base64")]);
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};
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next();
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};
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