iri-reference.js

const { parse } = require('uri-js');
const addressParser = require('smtp-address-parser').parse;
const schemes = require('schemes');

function validate(address) {
  try {
    addressParser(address);
    return true;
  } catch (err) {
    return false;
  }
}

module.exports = (value) => {
  const iri = parse(value);
  // All valid IRIs are valid IRI-references
  if (iri.scheme === 'mailto' && iri.to.every(validate)) {
    return true;
  }

  if (
    iri.reference === 'absolute' &&
    iri.path !== undefined &&
    schemes.allByName[iri.scheme]
  ) {
    return true;
  }

  // Check for valid IRI-reference

  // If there is a scheme, it must be valid
  if (iri.scheme && !schemes.allByName[iri.scheme]) {
    return false;
  }

  // Check there's a path and for a proper type of reference
  return (
    iri.path !== undefined &&
    (iri.reference === 'relative' ||
      iri.reference === 'same-document' ||
      iri.reference === 'uri')
  );
};