express-ipld/lib/index.js

Express middleware for dag-json and dag-cbor IPLD codecs

import express from "express";
import * as cbor from "@ipld/dag-cbor";
import * as json from "@ipld/dag-json";
export default function ipld(options = {}) {
    const rawParser = express.raw({
        type: options.type ?? ["application/json", "application/cbor"],
    });
    return (req, res, next) => {
        const contentType = req.headers["content-type"];
        rawParser(req, res, (err) => {
            if (err) {
                return next(err);
            }
            if (req.body instanceof Uint8Array) {
                if (contentType === "application/json") {
                    try {
                        req.body = json.decode(req.body);
                    }
                    catch (err) {
                        return res.status(400).send("Invalid dag-json request body");
                    }
                }
                else if (contentType === "application/cbor") {
                    try {
                        req.body = cbor.decode(req.body);
                    }
                    catch (err) {
                        return res.status(400).send("Invalid dag-cbor request body");
                    }
                }
                else {
                    return res.status(400).send("Invalid dag-cbor request body");
                }
            }
            next();
        });
    };
}