+ var DISALLOWED_ATTRIBUTES = ['sanitize', 'whiteList', 'sanitizeFn']
+
+ var uriAttrs = [
+ 'background',
+ 'cite',
+ 'href',
+ 'itemtype',
+ 'longdesc',
+ 'poster',
+ 'src',
+ 'xlink:href'
+ ]
+
+ var ARIA_ATTRIBUTE_PATTERN = /^aria-[\w-]*$/i
+
+ var DefaultWhitelist = {
+ // Global attributes allowed on any supplied element below.
+ '*': ['class', 'dir', 'id', 'lang', 'role', ARIA_ATTRIBUTE_PATTERN],
+ a: ['target', 'href', 'title', 'rel'],
+ area: [],
+ b: [],
+ br: [],
+ col: [],
+ code: [],
+ div: [],
+ em: [],
+ hr: [],
+ h1: [],
+ h2: [],
+ h3: [],
+ h4: [],
+ h5: [],
+ h6: [],
+ i: [],
+ img: ['src', 'alt', 'title', 'width', 'height'],
+ li: [],
+ ol: [],
+ p: [],
+ pre: [],
+ s: [],
+ small: [],
+ span: [],
+ sub: [],
+ sup: [],
+ strong: [],
+ u: [],
+ ul: []
+ }
+
+ /**
+ * A pattern that recognizes a commonly useful subset of URLs that are safe.
+ *
+ * Shoutout to Angular 7 https://github.com/angular/angular/blob/7.2.4/packages/core/src/sanitization/url_sanitizer.ts
+ */
+ var SAFE_URL_PATTERN = /^(?:(?:https?|mailto|ftp|tel|file):|[^&:/?#]*(?:[/?#]|$))/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
+ */
+ var 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+/]+=*$/i
+
+ function allowedAttribute(attr, allowedAttributeList) {
+ var attrName = attr.nodeName.toLowerCase()
+
+ if ($.inArray(attrName, allowedAttributeList) !== -1) {
+ if ($.inArray(attrName, uriAttrs) !== -1) {
+ return Boolean(attr.nodeValue.match(SAFE_URL_PATTERN) || attr.nodeValue.match(DATA_URL_PATTERN))
+ }
+
+ return true
+ }
+
+ var regExp = $(allowedAttributeList).filter(function (index, value) {
+ return value instanceof RegExp
+ })
+
+ // Check if a regular expression validates the attribute.
+ for (var i = 0, l = regExp.length; i < l; i++) {
+ if (attrName.match(regExp[i])) {
+ return true
+ }
+ }
+
+ return false
+ }
+
+ function sanitizeHtml(unsafeHtml, whiteList, sanitizeFn) {
+ if (unsafeHtml.length === 0) {
+ return unsafeHtml
+ }
+
+ if (sanitizeFn && typeof sanitizeFn === 'function') {
+ return sanitizeFn(unsafeHtml)
+ }
+
+ // IE 8 and below don't support createHTMLDocument
+ if (!document.implementation || !document.implementation.createHTMLDocument) {
+ return unsafeHtml
+ }
+
+ var createdDocument = document.implementation.createHTMLDocument('sanitization')
+ createdDocument.body.innerHTML = unsafeHtml
+
+ var whitelistKeys = $.map(whiteList, function (el, i) { return i })
+ var elements = $(createdDocument.body).find('*')
+
+ for (var i = 0, len = elements.length; i < len; i++) {
+ var el = elements[i]
+ var elName = el.nodeName.toLowerCase()
+
+ if ($.inArray(elName, whitelistKeys) === -1) {
+ el.parentNode.removeChild(el)
+
+ continue
+ }
+
+ var attributeList = $.map(el.attributes, function (el) { return el })
+ var whitelistedAttributes = [].concat(whiteList['*'] || [], whiteList[elName] || [])
+
+ for (var j = 0, len2 = attributeList.length; j < len2; j++) {
+ if (!allowedAttribute(attributeList[j], whitelistedAttributes)) {
+ el.removeAttribute(attributeList[j].nodeName)
+ }
+ }
+ }
+
+ return createdDocument.body.innerHTML
+ }
+