uploadio/lib/isEligibleRequest.js

Simple middleware for uploading files.

const ACCEPTABLE_CONTENT_TYPE = /^(multipart\/.+);(.*)$/i;
const UNACCEPTABLE_METHODS = ["GET", "HEAD", "OPTIONS"];

/**
 * Ensures the request contains a content body
 * @param  {Object}  req Express req object
 * @returns {Boolean}
 */
const hasBody = (req) => {
  return (
    "transfer-encoding" in req.headers ||
    ("content-length" in req.headers && req.headers["content-length"] !== "0")
  );
};

/**
 * Ensures the request is not using a non-compliant multipart method
 * such as GET or HEAD
 * @param  {Object}  req Express req object
 * @returns {Boolean}
 */
const hasAcceptableMethod = (req) => !UNACCEPTABLE_METHODS.includes(req.method);

/**
 * Ensures that only multipart requests are processed by express-fileupload
 * @param  {Object}  req Express req object
 * @returns {Boolean}
 */
const hasAcceptableContentType = (req) =>
  ACCEPTABLE_CONTENT_TYPE.test(req.headers["content-type"]);

/**
 * Ensures that the request in question is eligible for file uploads
 * @param {Object} req Express req object
 * @returns {Boolean}
 */
module.exports = (req, uploadOptions) =>
  hasBody(req) && hasAcceptableMethod(req) && hasAcceptableContentType(req);