js/dist/util/sanitizer.js

/*!
  * Bootstrap sanitizer.js v5.2.1 (https://getbootstrap.com/)
  * Copyright 2011-2022 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
  */
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
  typeof define === 'function' && define.amd ? define(['exports'], factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.Sanitizer = {}));
})(this, (function (exports) { 'use strict';

  /**
   * --------------------------------------------------------------------------
   * Bootstrap (v5.2.1): util/sanitizer.js
   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
   * --------------------------------------------------------------------------
   */
  const uriAttributes = new Set(['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.
   *
   * Shout-out to Angular https://github.com/angular/angular/blob/12.2.x/packages/core/src/sanitization/url_sanitizer.ts
   */

  const SAFE_URL_PATTERN = /^(?:(?:https?|mailto|ftp|tel|file|sms):|[^#&/:?]*(?:[#/?]|$))/i;
  /**
   * A pattern that matches safe data URLs. Only matches image, video and audio types.
   *
   * Shout-out to Angular https://github.com/angular/angular/blob/12.2.x/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,[\d+/a-z]+=*$/i;

  const allowedAttribute = (attribute, allowedAttributeList) => {
    const attributeName = attribute.nodeName.toLowerCase();

    if (allowedAttributeList.includes(attributeName)) {
      if (uriAttributes.has(attributeName)) {
        return Boolean(SAFE_URL_PATTERN.test(attribute.nodeValue) || DATA_URL_PATTERN.test(attribute.nodeValue));
      }

      return true;
    } // Check if a regular expression validates the attribute.


    return allowedAttributeList.filter(attributeRegex => attributeRegex instanceof RegExp).some(regex => regex.test(attributeName));
  };

  const DefaultAllowlist = {
    // 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: [],
    hr: [],
    h1: [],
    h2: [],
    h3: [],
    h4: [],
    h5: [],
    h6: [],
    i: [],
    img: ['src', 'srcset', 'alt', 'title', 'width', 'height'],
    li: [],
    ol: [],
    p: [],
    pre: [],
    s: [],
    small: [],
    span: [],
    sub: [],
    sup: [],
    strong: [],
    u: [],
    ul: []
  };
  function sanitizeHtml(unsafeHtml, allowList, sanitizeFunction) {
    if (!unsafeHtml.length) {
      return unsafeHtml;
    }

    if (sanitizeFunction && typeof sanitizeFunction === 'function') {
      return sanitizeFunction(unsafeHtml);
    }

    const domParser = new window.DOMParser();
    const createdDocument = domParser.parseFromString(unsafeHtml, 'text/html');
    const elements = [].concat(...createdDocument.body.querySelectorAll('*'));

    for (const element of elements) {
      const elementName = element.nodeName.toLowerCase();

      if (!Object.keys(allowList).includes(elementName)) {
        element.remove();
        continue;
      }

      const attributeList = [].concat(...element.attributes);
      const allowedAttributes = [].concat(allowList['*'] || [], allowList[elementName] || []);

      for (const attribute of attributeList) {
        if (!allowedAttribute(attribute, allowedAttributes)) {
          element.removeAttribute(attribute.nodeName);
        }
      }
    }

    return createdDocument.body.innerHTML;
  }

  exports.DefaultAllowlist = DefaultAllowlist;
  exports.sanitizeHtml = sanitizeHtml;

  Object.defineProperties(exports, { __esModule: { value: true }, [Symbol.toStringTag]: { value: 'Module' } });

}));
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