sanitizer.js

/**
 * --------------------------------------------------------------------------
 * Bootstrap (v4.3.1): util/sanitizer.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 * --------------------------------------------------------------------------
 */

import { makeArray } from './index'

const uriAttrs = [
  'background',
  'cite',
  'href',
  'itemtype',
  'longdesc',
  'poster',
  'src',
  'xlink:href'
]

const ARIA_ATTRIBUTE_PATTERN = /^aria-[\w-]*$/i

/**
 * A pattern that recognizes a commonly useful subset of URLs that are safe.
 *
 * Shoutout to Angular 7 https://github.com/angular/angular/blob/7.2.4/packages/core/src/sanitization/url_sanitizer.ts
 */
const SAFE_URL_PATTERN = /^(?:(?:https?|mailto|ftp|tel|file):|[^&:/?#]*(?:[/?#]|$))/gi

/**
 * A pattern that matches safe data URLs. Only matches image, video and audio types.
 *
 * Shoutout to Angular 7 https://github.com/angular/angular/blob/7.2.4/packages/core/src/sanitization/url_sanitizer.ts
 */
const DATA_URL_PATTERN = /^data:(?:image\/(?:bmp|gif|jpeg|jpg|png|tiff|webp)|video\/(?:mpeg|mp4|ogg|webm)|audio\/(?:mp3|oga|ogg|opus));base64,[a-z0-9+/]+=*$/i

const allowedAttribute = (attr, allowedAttributeList) => {
  const attrName = attr.nodeName.toLowerCase()

  if (allowedAttributeList.indexOf(attrName) !== -1) {
    if (uriAttrs.indexOf(attrName) !== -1) {
      return Boolean(attr.nodeValue.match(SAFE_URL_PATTERN) || attr.nodeValue.match(DATA_URL_PATTERN))
    }

    return true
  }

  const regExp = allowedAttributeList.filter(attrRegex => attrRegex instanceof RegExp)

  // Check if a regular expression validates the attribute.
  for (let i = 0, l = regExp.length; i < l; i++) {
    if (attrName.match(regExp[i])) {
      return true
    }
  }

  return false
}

export const DefaultWhitelist = {
  // Global attributes allowed on any supplied element below.
  '*': ['class', 'dir', 'id', 'lang', 'role', ARIA_ATTRIBUTE_PATTERN],
  a: ['target', 'href', 'title', 'rel'],
  area: [],
  b: [],
  br: [],
  col: [],
  code: [],
  div: [],
  em: [],