next-csrf/example/node_modules/ally.js/esm/observe/shadow-mutations.js

CSRF mitigation library for Next.js

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

import nodeArray from '../util/node-array';
import queryShadowHosts from '../query/shadow-hosts';
import contextToElement from '../util/context-to-element';

var shadowObserverConfig = {
  childList: true,
  subtree: true
};

var ShadowMutationObserver = function () {
  function ShadowMutationObserver() {
    var _this = this;

    var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
        context = _ref.context,
        callback = _ref.callback,
        config = _ref.config;

    _classCallCheck(this, ShadowMutationObserver);

    this.config = config;

    this.disengage = this.disengage.bind(this);

    this.clientObserver = new MutationObserver(callback);
    this.hostObserver = new MutationObserver(function (mutations) {
      return mutations.forEach(_this.handleHostMutation, _this);
    });

    this.observeContext(context);
    this.observeShadowHosts(context);
  }

  _createClass(ShadowMutationObserver, [{
    key: 'disengage',
    value: function disengage() {
      this.clientObserver && this.clientObserver.disconnect();
      this.clientObserver = null;
      this.hostObserver && this.hostObserver.disconnect();
      this.hostObserver = null;
    }
  }, {
    key: 'observeShadowHosts',
    value: function observeShadowHosts(context) {
      var _this2 = this;

      var hosts = queryShadowHosts({
        context: context
      });

      hosts.forEach(function (element) {
        return _this2.observeContext(element.shadowRoot);
      });
    }
  }, {
    key: 'observeContext',
    value: function observeContext(context) {
      this.clientObserver.observe(context, this.config);
      this.hostObserver.observe(context, shadowObserverConfig);
    }
  }, {
    key: 'handleHostMutation',
    value: function handleHostMutation(mutation) {
      if (mutation.type !== 'childList') {
        return;
      }

      var addedElements = nodeArray(mutation.addedNodes).filter(function (element) {
        return element.nodeType === Node.ELEMENT_NODE;
      });
      addedElements.forEach(this.observeShadowHosts, this);
    }
  }]);

  return ShadowMutationObserver;
}();

export default function () {
  var _ref2 = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
      context = _ref2.context,
      callback = _ref2.callback,
      config = _ref2.config;

  if (typeof callback !== 'function') {
    throw new TypeError('observe/shadow-mutations requires options.callback to be a function');
  }

  if ((typeof config === 'undefined' ? 'undefined' : _typeof(config)) !== 'object') {
    throw new TypeError('observe/shadow-mutations requires options.config to be an object');
  }

  if (!window.MutationObserver) {
    // not supporting IE10 via Mutation Events, because they're too expensive
    // https://developer.mozilla.org/en-US/docs/Web/Guide/Events/Mutation_events
    return {
      disengage: function disengage() {}
    };
  }

  var element = contextToElement({
    label: 'observe/shadow-mutations',
    resolveDocument: true,
    defaultToDocument: true,
    context: context
  });

  var service = new ShadowMutationObserver({
    context: element,
    callback: callback,
    config: config
  });

  return {
    disengage: service.disengage
  };
}
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