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/**
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* --------------------------------------------------------------------------
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* Bootstrap (v4.6.2): tools/sanitizer.js
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* Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/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', 'srcset', '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 https://github.com/angular/angular/blob/12.2.x/packages/core/src/sanitization/url_sanitizer.ts
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*/
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const SAFE_URL_PATTERN = /^(?:(?:https?|mailto|ftp|tel|file|sms):|[^#&/:?]*(?:[#/?]|$))/i
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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 https://github.com/angular/angular/blob/12.2.x/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,[\d+/a-z]+=*$/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) {
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if (uriAttrs.indexOf(attrName) !== -1) {
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return Boolean(SAFE_URL_PATTERN.test(attr.nodeValue) || DATA_URL_PATTERN.test(attr.nodeValue))
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}
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return true
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}
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const regExp = allowedAttributeList.filter(attrRegex => attrRegex instanceof RegExp)
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// Check if a regular expression validates the attribute.
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for (let i = 0, len = regExp.length; i < len; i++) {
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if (regExp[i].test(attrName)) {
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return true
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}
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}
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return false
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}
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export function sanitizeHtml(unsafeHtml, whiteList, sanitizeFn) {
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if (unsafeHtml.length === 0) {
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return unsafeHtml
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}
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if (sanitizeFn && typeof sanitizeFn === 'function') {
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return sanitizeFn(unsafeHtml)
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}
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const domParser = new window.DOMParser()
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const createdDocument = domParser.parseFromString(unsafeHtml, 'text/html')
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const whitelistKeys = Object.keys(whiteList)
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const elements = [].slice.call(createdDocument.body.querySelectorAll('*'))
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for (let i = 0, len = elements.length; i < len; i++) {
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const el = elements[i]
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const elName = el.nodeName.toLowerCase()
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if (whitelistKeys.indexOf(el.nodeName.toLowerCase()) === -1) {
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el.parentNode.removeChild(el)
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continue
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}
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const attributeList = [].slice.call(el.attributes)
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// eslint-disable-next-line unicorn/prefer-spread
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const whitelistedAttributes = [].concat(whiteList['*'] || [], whiteList[elName] || [])
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attributeList.forEach(attr => {
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if (!allowedAttribute(attr, whitelistedAttributes)) {
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el.removeAttribute(attr.nodeName)
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}
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})
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}
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return createdDocument.body.innerHTML
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}
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