next-csrf/example/node_modules/ally.js/style/focus-source.js

CSRF mitigation library for Next.js

'use strict';

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

var _toggleClass = require('../util/toggle-class');

var _shadowFocus = require('../event/shadow-focus');

var _shadowFocus2 = _interopRequireDefault(_shadowFocus);

var _interactionType = require('../observe/interaction-type');

var _interactionType2 = _interopRequireDefault(_interactionType);

var _decorateService = require('../util/decorate-service');

var _decorateService2 = _interopRequireDefault(_decorateService);

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

// preferring focusin/out because they are synchronous in IE10+11

/*
  add data-focus-source attribute to html element containing "key", "pointer" or "script"
  depending on the input method used to change focus.

  USAGE:
    style/focus-source()

    body :focus {
      outline: 1px solid grey;
    }

    html[data-focus-source="key"] body :focus {
      outline: 5px solid red;
    }

    html[data-focus-source="key"] body :focus {
      outline: 1px solid blue;
    }

  NOTE: I don't have a GamePad to test, if you do and you want to
  implement an observer for https://w3c.github.io/gamepad/ - send a PR!

  Alternate implementation: https://github.com/alice/modality
*/

var supportsFocusIn = typeof document !== 'undefined' && 'onfocusin' in document;
var focusEventName = supportsFocusIn ? 'focusin' : 'focus';
var blurEventName = supportsFocusIn ? 'focusout' : 'blur';

// interface to read interaction-type-listener state
var interactionTypeHandler = void 0;
var shadowHandle = void 0;
// keep track of last focus source
var current = null;
// overwrite focus source for use with the every upcoming focus event
var lock = null;
// keep track of ever having used a particular input method to change focus
var used = {
  pointer: false,
  key: false,
  script: false,
  initial: false
};

function handleFocusEvent(event) {
  var source = '';
  if (event.type === focusEventName || event.type === 'shadow-focus') {
    var interactionType = interactionTypeHandler.get();
    source = lock || interactionType.pointer && 'pointer' || interactionType.key && 'key' || 'script';
  } else if (event.type === 'initial') {
    source = 'initial';
  }

  document.documentElement.setAttribute('data-focus-source', source);

  if (event.type !== blurEventName) {
    if (!used[source]) {
      (0, _toggleClass.addClass)(document.documentElement, 'focus-source-' + source);
    }

    used[source] = true;
    current = source;
  }
}

function getCurrentFocusSource() {
  return current;
}

function getUsedFocusSource(source) {
  return used[source];
}

function lockFocusSource(source) {
  lock = source;
}

function unlockFocusSource() {
  lock = false;
}

function disengage() {
  // clear dom state
  handleFocusEvent({ type: blurEventName });
  current = lock = null;
  Object.keys(used).forEach(function (key) {
    (0, _toggleClass.removeClass)(document.documentElement, 'focus-source-' + key);
    used[key] = false;
  });
  // kill interaction type identification listener
  interactionTypeHandler.disengage();
  // kill shadow-focus event dispatcher
  shadowHandle && shadowHandle.disengage();
  document.removeEventListener('shadow-focus', handleFocusEvent, true);
  document.documentElement.removeEventListener(focusEventName, handleFocusEvent, true);
  document.documentElement.removeEventListener(blurEventName, handleFocusEvent, true);
  document.documentElement.removeAttribute('data-focus-source');
}

function engage() {
  // enable the shadow-focus event dispatcher
  shadowHandle = (0, _shadowFocus2.default)();
  // handlers to modify the focused element
  document.addEventListener('shadow-focus', handleFocusEvent, true);
  document.documentElement.addEventListener(focusEventName, handleFocusEvent, true);
  document.documentElement.addEventListener(blurEventName, handleFocusEvent, true);
  // enable the interaction type identification observer
  interactionTypeHandler = (0, _interactionType2.default)();
  // set up initial dom state
  handleFocusEvent({ type: 'initial' });

  return {
    used: getUsedFocusSource,
    current: getCurrentFocusSource,
    lock: lockFocusSource,
    unlock: unlockFocusSource
  };
}

exports.default = (0, _decorateService2.default)({ engage: engage, disengage: disengage });
module.exports = exports['default'];
//# sourceMappingURL=focus-source.js.map