@towavephone/react-watermark-component/dist/SecurityDefense.js

react-watermark-component is a component that can generate a water mark background image.

'use strict';

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

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

var SecurityDefense = function SecurityDefense(watermarkDOM, style, securityHooks) {
  var _this = this;

  _classCallCheck(this, SecurityDefense);

  this.getDOM = function (id) {
    return document.getElementById(id);
  };

  this.registerNodeRemoveListener = function (target) {
    var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
    var observer = new MutationObserver(function (mutations) {
      mutations.forEach(function (mutation) {
        if (mutation.type === 'childList') {
          var removeNodes = mutation.removedNodes;
          if (removeNodes && removeNodes[0] && removeNodes[0].id) {
            var id = removeNodes[0].id;
            if (id && id.indexOf(_this.watermarkId) > -1) {
              if (_this.securityAlarm) {
                _this.securityAlarm();
              }
              _this.createWaterMarkDom(target);
            }
          }
        }
      });
    });
    var config = { childList: true };
    observer.observe(target, config);
    _this.updateObserver({ DOMRemoveObserver: observer });
  };

  this.createWaterMarkDom = function (parent) {
    var newWaterMark = document.createElement('div');
    _this.watermarkId = _this.genRandomId('water-mark-dynamic');
    newWaterMark.id = _this.watermarkId;
    _this.waterMarkStyle = _this.waterMarkStyle.concat('background-image: url("' + _this.getImageUrl() + '");');
    newWaterMark.style = _this.waterMarkStyle;
    parent.appendChild(newWaterMark);
    var newDOM = _this.getDOM(_this.watermarkId);
    _this.registerNodeAttrChangeListener(newDOM);
  };

  this.registerNodeAttrChangeListener = function (target) {
    var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
    var observer = new MutationObserver(function (mutations) {
      mutations.forEach(function (mutation) {
        if (mutation.type === 'attributes') {
          target.parentNode.removeChild(target);
          observer.disconnect();
        }
      });
    });
    var config = { attributes: true, attributeFilter: ['style'] };
    observer.observe(target, config);
    _this.updateObserver({ DOMAttrModifiedObserver: observer });
  };

  this.watermarkId = watermarkDOM.watermarkId;
  this.watermarkWrapperId = watermarkDOM.watermarkWrapperId;
  this.genRandomId = watermarkDOM.genRandomId;

  this.waterMarkStyle = style.waterMarkStyle;
  this.getImageUrl = style.getCanvasUrl;

  this.securityAlarm = securityHooks.securityAlarm;
  this.updateObserver = securityHooks.updateObserver;

  var wrapper = this.getDOM(this.watermarkWrapperId);
  var watermark = this.getDOM(this.watermarkId);
  this.registerNodeRemoveListener(wrapper);
  this.registerNodeAttrChangeListener(watermark);
};

exports.default = SecurityDefense;
module.exports = exports['default'];
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