express-msgpack/dist/esm/index.js

Transparent MessagePack middleware for Express

import readBody from "raw-body";
export default (overrides = {}) => {
    const optionsPromise = createOptions(overrides);
    return async (req, res, next) => {
        try {
            const options = await optionsPromise;
            const _json = res.json;
            res.json = (body) => {
                return res.format({
                    "application/json": () => _json.call(res, body),
                    [options.mimeType]: () => res.send(options.encoder(body)),
                });
            };
            if (new RegExp(`^${options.mimeType}`, "i").test(req.header("Content-Type") ?? "")) {
                return readBody(req, { length: req.header("Content-Length"), limit: options.limit }, bodyHandler(options, req, next));
            }
            next();
        }
        catch (err) {
            next(err);
        }
    };
};
const bodyHandler = (options, req, next) => (err, body) => {
    if (err) {
        return next(err);
    }
    try {
        req.body = options.decoder(body);
    }
    catch (err) {
        return next(err);
    }
    req._body = true;
    next();
};
const createOptions = async (overrides) => {
    return {
        decoder: overrides.decoder
            ?? await import("@msgpack/msgpack").then(({ decode }) => decode),
        encoder: overrides.encoder
            ?? await import("@msgpack/msgpack").then(({ encode }) => (body) => Buffer.from(encode(body))),
        limit: overrides.limit
            ?? "100kb",
        mimeType: overrides.mimeType
            ?? "application/msgpack",
    };
};