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✏️ Editing: sanitizer.js

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

// js-docs-start allow-list
const ARIA_ATTRIBUTE_PATTERN = /^aria-[\w-]*$/i

export 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: [],
  dd: [],
  div: [],
  dl: [],
  dt: [],
  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: []
}
// js-docs-end allow-list

const uriAttributes = new Set([
  'background',
  'cite',
  'href',
  'itemtype',
  'longdesc',
  'poster',
  'src',
  'xlink:href'
])

/**
 * A pattern that recognizes URLs that are safe wrt. XSS in URL navigation
 * contexts.
 *
 * Shout-out to Angular https://github.com/angular/angular/blob/15.2.8/packages/core/src/sanitization/url_sanitizer.ts#L38
 */
// eslint-disable-next-line unicorn/better-regex
const SAFE_URL_PATTERN = /^(?!javascript:)(?:[a-z0-9+.-]+:|[^&:/?#]*(?:[/?#]|$))/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))
    }

return true
  }

// Check if a regular expression validates the attribute.
  return allowedAttributeList.filter(attributeRegex => attributeRegex instanceof RegExp)
    .some(regex => regex.test(attributeName))
}

export 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
}

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