Add sanitize template option for tooltip/popover plugins.

2 files changed, 173 insertions, 13 deletions

diff --git a/js/src/tools/sanitizer.js b/js/src/tools/sanitizer.js
new file mode 100644
index 000000000..00ed0d29e
--- /dev/null
+++ b/js/src/tools/sanitizer.js
@@ -0,0 +1,127 @@
+/**
+ * --------------------------------------------------------------------------
+ * Bootstrap (v4.3.0): 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-]*$/i
+
+export const DefaultWhitelist = {
+  // Global attributes allowed on any supplied element below.
+  '*': ['class', 'dir', 'id', 'lang', 'role', ARIA_ATTRIBUTE_PATTERN],
+  a: ['target', 'href', 'title', 'rel'],
+  area: [],
+  b: [],
+  br: [],
+  col: [],
+  code: [],
+  div: [],
+  em: [],
+  hr: [],
+  h1: [],
+  h2: [],
+  h3: [],
+  h4: [],
+  h5: [],
+  h6: [],
+  i: [],
+  img: ['src', 'alt', 'title', 'width', 'height'],
+  li: [],
+  ol: [],
+  p: [],
+  pre: [],
+  s: [],
+  small: [],
+  span: [],
+  sub: [],
+  sup: [],
+  strong: [],
+  u: [],
+  ul: []
+}
+
+/**
+ * A pattern that recognizes a commonly useful subset of URLs that are safe.
+ *
+ * Shoutout to Angular 7 https://github.com/angular/angular/blob/7.2.4/packages/core/src/sanitization/url_sanitizer.ts
+ */
+const SAFE_URL_PATTERN = /^(?:(?:https?|mailto|ftp|tel|file):|[^&:/?#]*(?:[/?#]|$))/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,[a-z0-9+/]+=*$/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, 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
+}
diff --git a/js/src/tooltip.js b/js/src/tooltip.js
index 859ab918f..e7b5b2a7f 100644
--- a/js/src/tooltip.js
+++ b/js/src/tooltip.js
@@ -5,6 +5,10 @@
  * --------------------------------------------------------------------------
  */
 
+import {
+  DefaultWhitelist,
+  sanitizeHtml
+} from './tools/sanitizer'
 import $ from 'jquery'
 import Popper from 'popper.js'
 import Util from './util'
@@ -15,13 +19,14 @@ import Util from './util'
  * ------------------------------------------------------------------------
  */
 
-const NAME               = 'tooltip'
-const VERSION            = '4.3.0'
-const DATA_KEY           = 'bs.tooltip'
-const EVENT_KEY          = `.${DATA_KEY}`
-const JQUERY_NO_CONFLICT = $.fn[NAME]
-const CLASS_PREFIX       = 'bs-tooltip'
-const BSCLS_PREFIX_REGEX = new RegExp(`(^|\\s)${CLASS_PREFIX}\\S+`, 'g')
+const NAME                  = 'tooltip'
+const VERSION               = '4.3.0'
+const DATA_KEY              = 'bs.tooltip'
+const EVENT_KEY             = `.${DATA_KEY}`
+const JQUERY_NO_CONFLICT    = $.fn[NAME]
+const CLASS_PREFIX          = 'bs-tooltip'
+const BSCLS_PREFIX_REGEX    = new RegExp(`(^|\\s)${CLASS_PREFIX}\\S+`, 'g')
+const DISALLOWED_ATTRIBUTES = ['sanitize', 'whiteList', 'sanitizeFn']
 
 const DefaultType = {
   animation         : 'boolean',
@@ -35,7 +40,10 @@ const DefaultType = {
   offset            : '(number|string|function)',
   container         : '(string|element|boolean)',
   fallbackPlacement : '(string|array)',
-  boundary          : '(string|element)'
+  boundary          : '(string|element)',
+  sanitize          : 'boolean',
+  sanitizeFn        : '(null|function)',
+  whiteList         : 'object'
 }
 
 const AttachmentMap = {
@@ -60,7 +68,10 @@ const Default = {
   offset            : 0,
   container         : false,
   fallbackPlacement : 'flip',
-  boundary          : 'scrollParent'
+  boundary          : 'scrollParent',
+  sanitize          : true,
+  sanitizeFn        : null,
+  whiteList         : DefaultWhitelist
 }
 
 const HoverState = {
@@ -419,18 +430,27 @@ class Tooltip {
   }
 
   setElementContent($element, content) {
-    const html = this.config.html
     if (typeof content === 'object' && (content.nodeType || content.jquery)) {
       // Content is a DOM node or a jQuery
-      if (html) {
+      if (this.config.html) {
         if (!$(content).parent().is($element)) {
           $element.empty().append(content)
         }
       } else {
         $element.text($(content).text())
       }
+
+      return
+    }
+
+    if (this.config.html) {
+      if (this.config.sanitize) {
+        content = sanitizeHtml(content, this.config.whiteList, this.config.sanitizeFn)
+      }
+
+      $element.html(content)
     } else {
-      $element[html ? 'html' : 'text'](content)
+      $element.text(content)
     }
   }
 
@@ -636,9 +656,18 @@ class Tooltip {
   }
 
   _getConfig(config) {
+    const dataAttributes = $(this.element).data()
+
+    Object.keys(dataAttributes)
+      .forEach((dataAttr) => {
+        if (DISALLOWED_ATTRIBUTES.indexOf(dataAttr) !== -1) {
+          delete dataAttributes[dataAttr]
+        }
+      })
+
     config = {
       ...this.constructor.Default,
-      ...$(this.element).data(),
+      ...dataAttributes,
       ...typeof config === 'object' && config ? config : {}
     }
 
@@ -663,6 +692,10 @@ class Tooltip {
       this.constructor.DefaultType
     )
 
+    if (config.sanitize) {
+      config.template = sanitizeHtml(config.template, config.whiteList, config.sanitizeFn)
+    }
+
     return config
   }