indieauth-authentication/dist/lib/rel-scraper.js

A helper class for creating apps that authenticate via IndieAuth

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

exports.default = function (htmlString, url) {
  var rels = {};
  var baseUrl = url;

  var doc = new DOMParser().parseFromString(htmlString, 'text/html');
  var baseEl = doc.querySelector('base[href]');
  var relEls = doc.querySelectorAll('[rel][href]');

  if (baseEl) {
    var value = baseEl.getAttribute('href');
    var urlObj = new URL(value, url);
    baseUrl = urlObj.toString();
  }

  if (relEls.length) {
    relEls.forEach(function (relEl) {
      var names = relEl.getAttribute('rel').toLowerCase().split('\\s+');
      var value = relEl.getAttribute('href');
      if (names.length && value !== null) {
        names.forEach(function (name) {
          if (!rels[name]) {
            rels[name] = [];
          }
          var url = new URL(value, baseUrl).toString();
          if (rels[name].indexOf(url) === -1) {
            rels[name].push(url);
          }
        });
      }
    });
  }

  return rels;
};

module.exports = exports['default'];