next-csrf/example/node_modules/ally.js/is/valid-area.js

CSRF mitigation library for Next.js

'use strict';

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

exports.default = function (context) {
  if (!supports) {
    supports = (0, _supports3.default)();
  }

  var element = (0, _contextToElement2.default)({
    label: 'is/valid-area',
    context: context
  });

  var nodeName = element.nodeName.toLowerCase();
  if (nodeName !== 'area') {
    return false;
  }

  var hasTabindex = element.hasAttribute('tabindex');
  if (!supports.focusAreaTabindex && hasTabindex) {
    // Blink and WebKit do not consider <area tabindex="-1" href="#void"> focusable
    return false;
  }

  var img = (0, _imageMap.getImageOfArea)(element);
  if (!img || !(0, _visible2.default)(img)) {
    return false;
  }

  // Firefox only allows fully loaded images to reference image maps
  // https://stereochro.me/ideas/detecting-broken-images-js
  if (!supports.focusBrokenImageMap && (!img.complete || !img.naturalHeight || img.offsetWidth <= 0 || img.offsetHeight <= 0)) {
    return false;
  }

  // Firefox supports.can focus area elements even if they don't have an href attribute
  if (!supports.focusAreaWithoutHref && !element.href) {
    // Internet explorer supports.can focus area elements without href if either
    // the area element or the image element has a tabindex attribute
    return supports.focusAreaTabindex && hasTabindex || supports.focusAreaImgTabindex && img.hasAttribute('tabindex');
  }

  // https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#attr-usemap
  var childOfInteractive = (0, _parents2.default)({ context: img }).slice(1).some(function (_element) {
    var name = _element.nodeName.toLowerCase();
    return name === 'button' || name === 'a';
  });

  if (childOfInteractive) {
    return false;
  }

  return true;
};

var _contextToElement = require('../util/context-to-element');

var _contextToElement2 = _interopRequireDefault(_contextToElement);

var _visible = require('./visible');

var _visible2 = _interopRequireDefault(_visible);

var _parents = require('../get/parents');

var _parents2 = _interopRequireDefault(_parents);

var _imageMap = require('../util/image-map');

var _supports2 = require('../supports/supports');

var _supports3 = _interopRequireDefault(_supports2);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var supports = void 0;

// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/map
// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#attr-usemap
// https://github.com/jquery/jquery-ui/blob/master/ui/core.js#L88-L107

// determine if an <area> element is being properly used by and <img> via a <map>

module.exports = exports['default'];
//# sourceMappingURL=valid-area.js.map