react/src/utils/escapeTextForBrowser.js

/**
 * Copyright 2013 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @providesModule escapeTextForBrowser
 * @typechecks static-only
 */

"use strict";

var invariant = require('invariant');

var ESCAPE_LOOKUP = {
  "&": "&",
  ">": ">",
  "<": "&lt;",
  "\"": "&quot;",
  "'": "&#x27;",
  "/": "&#x2f;"
};

function escaper(match) {
  return ESCAPE_LOOKUP[match];
}

/**
 * Escapes text to prevent scripting attacks.
 *
 * @param {number|string} text Text value to escape.
 * @return {string} An escaped string.
 */
function escapeTextForBrowser(text) {
  var type = typeof text;
  invariant(
    type !== 'object',
    'escapeTextForBrowser(...): Attempted to escape an object.'
  );
  if (text === '') {
    return '';
  } else {
    if (type === 'string') {
      return text.replace(/[&><"'\/]/g, escaper);
    } else {
      return (''+text).replace(/[&><"'\/]/g, escaper);
    }
  }
}

module.exports = escapeTextForBrowser;