check_header/lib/headers.js

Check if headers aren't invalid for correct use in setHeader or writeHead functions

// From NodeJS - https://github.com/nodejs/node/commit/2a2d3e1b0333441d1bd00def06d687f807067f6e

// True if val contains an invalid field-vchar
//  field-value    = *( field-content / obs-fold )
//  field-content  = field-vchar [ 1*( SP / HTAB ) field-vchar ]
//  field-vchar    = VCHAR / obs-text
'use strict';

function checkInvalidHeaderChar(val) {
  for (var i = 0; i < val.length; i++) {
    var ch = val.charCodeAt(i);
    if (ch === 9) continue;
    if (ch <= 31 || ch > 255 || ch === 127) return true;
  }
  return false;
}

// Verifies that the given val is a valid HTTP token
// per the rules defined in RFC 7230
var token = /^[a-zA-Z0-9_!#$%&'*+.^`|~-]+$/;
function checkIsHttpToken(val) {
  return typeof val === 'string' && token.test(val);
}
// Get object with headers and return bool
function isValid(headers) {
  for (var property in headers) {
    if (headers.hasOwnProperty(property)) {
      if (checkInvalidHeaderChar(headers[property]) === true) {
        return false;
      }
      if (checkIsHttpToken(property) === false) {
        return false;
      }
    }
  }
  return true;
}

module.exports = {
  checkInvalidHeaderChar: checkInvalidHeaderChar,
  checkIsHttpToken: checkIsHttpToken,
  isValid: isValid
};
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