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Viewing file: sanitizer.js (3.29 KB) -rw-r--r-- Select action/file-type: (+) | (+) | (+) | Code (+) | Session (+) | (+) | SDB (+) | (+) | (+) | (+) | (+) | (+) | /** * -------------------------------------------------------------------------- * Bootstrap (v4.5.0): tools/sanitizer.js * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE) * -------------------------------------------------------------------------- */ const uriAttrs = [ 'background', 'cite', 'href', 'itemtype', 'longdesc', 'poster', 'src', 'xlink:href' ] const ARIA_ATTRIBUTE_PATTERN = /^aria-[\w-]*$/i export const DefaultWhitelist = { // Global attributes allowed on any supplied element below. '*': ['class', 'dir', 'id', 'lang', 'role', ARIA_ATTRIBUTE_PATTERN], a: ['target', 'href', 'title', 'rel'], area: [], b: [], br: [], col: [], code: [], div: [], em: [], hr: [], h1: [], h2: [], h3: [], h4: [], h5: [], h6: [], i: [], img: ['src', 'srcset', 'alt', 'title', 'width', 'height'], li: [], ol: [], p: [], pre: [], s: [], small: [], span: [], sub: [], sup: [], strong: [], u: [], ul: [] } /** * A pattern that recognizes a commonly useful subset of URLs that are safe. * * Shoutout to Angular 7 https://github.com/angular/angular/blob/7.2.4/packages/core/src/sanitization/url_sanitizer.ts */ const SAFE_URL_PATTERN = /^(?:(?:https?|mailto|ftp|tel|file):|[^#&/:?]*(?:[#/?]|$))/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,[\d+/a-z]+=*$/i function 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, len = regExp.length; i < len; 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 } |
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