@middy/http-urlencode-body-parser/index.js

import { createError } from '@middy/util';
import parse from 'qs/lib/parse.js';
const mimePattern = /^application\/x-www-form-urlencoded(;.*)?$/;
const defaults = {
    disableContentTypeError: true
};
const httpUrlencodeBodyParserMiddleware = (opts = {})=>{
    const options = {
        ...defaults,
        ...opts
    };
    const httpUrlencodeBodyParserMiddlewareBefore = async (request)=>{
        const { headers, body } = request.event;
        const contentType = headers?.['Content-Type'] ?? headers?.['content-type'];
        if (!mimePattern.test(contentType)) {
            if (options.disableContentTypeError) {
                return;
            }
            throw createError(415, 'Unsupported Media Type', {
                cause: contentType
            });
        }
        const data = request.event.isBase64Encoded ? Buffer.from(body, 'base64').toString() : body;
        const rawBody = body;
        request.event.body = parse(data);
        if (request.event.body?.[rawBody] === '') {
            // UnprocessableEntity
            throw createError(415, 'Invalid or malformed URL encoded form was provided', {
                cause: '@middy/http-urlencode-body-parser unable to parse body'
            });
        }
    };
    return {
        before: httpUrlencodeBodyParserMiddlewareBefore
    };
};
export default httpUrlencodeBodyParserMiddleware;