kequapp/dist/body/multipart/parse-multipart.js

A minimal, zero-magic Node web framework built on native APIs

import headerAttributes from "../../util/header-attributes.js";
export default function parseMultipart(parts) {
    const result = {};
    const files = [];
    const counters = {};
    for (const part of parts) {
        const { filename, name } = headerAttributes(part.headers['content-disposition']);
        const contentType = getContentType(part.headers['content-type']);
        const isFile = filename ?? !contentType.startsWith('text/');
        if (isFile) {
            files.push({ ...part, contentType, name, filename });
            continue;
        }
        const key = name ?? 'undefined';
        const value = part.data.toString();
        counters[key] = counters[key] ?? 0;
        counters[key]++;
        if (counters[key] === 2) {
            // convert to array
            result[key] = [result[key]];
        }
        if (counters[key] > 1) {
            // add to array
            result[key].push(value);
        }
        else {
            // set value
            result[key] = value;
        }
    }
    return [result, files];
}
function getContentType(contentType) {
    return contentType?.split(';')[0].toLowerCase().trim() ?? 'text/plain';
}