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sanitizer.js 3.28 KiB
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/**
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 * --------------------------------------------------------------------------
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 * Bootstrap (v4.4.0): tools/sanitizer.js
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 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
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 * --------------------------------------------------------------------------
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 */
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const uriAttrs = [
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  'background',
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  'cite',
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  'href',
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  'itemtype',
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  'longdesc',
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  'poster',
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  'src',
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  'xlink:href'
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]
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const ARIA_ATTRIBUTE_PATTERN = /^aria-[\w-]*$/i
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export const DefaultWhitelist = {
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  // Global attributes allowed on any supplied element below.
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  '*': ['class', 'dir', 'id', 'lang', 'role', ARIA_ATTRIBUTE_PATTERN],
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  a: ['target', 'href', 'title', 'rel'],
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  area: [],
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  b: [],
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  br: [],
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  col: [],
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  code: [],
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  div: [],
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  em: [],
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  hr: [],
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  h1: [],
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  h2: [],
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  h3: [],
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  h4: [],
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  h5: [],
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  h6: [],
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  i: [],
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  img: ['src', 'alt', 'title', 'width', 'height'],
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  li: [],
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  ol: [],
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  p: [],
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  pre: [],
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  s: [],
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  small: [],
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  span: [],
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  sub: [],
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  sup: [],
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  strong: [],
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  u: [],
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  ul: []
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}
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/**
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 * A pattern that recognizes a commonly useful subset of URLs that are safe.
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 *
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 * Shoutout to Angular 7 https://github.com/angular/angular/blob/7.2.4/packages/core/src/sanitization/url_sanitizer.ts
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 */
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const SAFE_URL_PATTERN = /^(?:(?:https?|mailto|ftp|tel|file):|[^&:/?#]*(?:[/?#]|$))/gi
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/**
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 * A pattern that matches safe data URLs. Only matches image, video and audio types.
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 *
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 * Shoutout to Angular 7 https://github.com/angular/angular/blob/7.2.4/packages/core/src/sanitization/url_sanitizer.ts
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 */
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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
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function allowedAttribute(attr, allowedAttributeList) {
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  const attrName = attr.nodeName.toLowerCase()
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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 function sanitizeHtml(unsafeHtml, whiteList, sanitizeFn) { if (unsafeHtml.length === 0) { return unsafeHtml } if (sanitizeFn && typeof sanitizeFn === 'function') { return sanitizeFn(unsafeHtml) } const domParser = new window.DOMParser() const createdDocument = domParser.parseFromString(unsafeHtml, 'text/html') const whitelistKeys = Object.keys(whiteList) const elements = [].slice.call(createdDocument.body.querySelectorAll('*')) for (let i = 0, len = elements.length; i < len; i++) { const el = elements[i] const elName = el.nodeName.toLowerCase() if (whitelistKeys.indexOf(el.nodeName.toLowerCase()) === -1) { el.parentNode.removeChild(el) continue } const attributeList = [].slice.call(el.attributes) const whitelistedAttributes = [].concat(whiteList['*'] || [], whiteList[elName] || []) attributeList.forEach((attr) => { if (!allowedAttribute(attr, whitelistedAttributes)) { el.removeAttribute(attr.nodeName) } }) } return createdDocument.body.innerHTML }