@angular/core
Version:
Angular - the core framework
291 lines • 42.7 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { XSS_SECURITY_URL } from '../error_details_base_url';
import { trustedHTMLFromString } from '../util/security/trusted_types';
import { getInertBodyHelper } from './inert_body';
import { _sanitizeUrl } from './url_sanitizer';
function tagSet(tags) {
const res = {};
for (const t of tags.split(','))
res[t] = true;
return res;
}
function merge(...sets) {
const res = {};
for (const s of sets) {
for (const v in s) {
if (s.hasOwnProperty(v))
res[v] = true;
}
}
return res;
}
// Good source of info about elements and attributes
// https://html.spec.whatwg.org/#semantics
// https://simon.html5.org/html-elements
// Safe Void Elements - HTML5
// https://html.spec.whatwg.org/#void-elements
const VOID_ELEMENTS = tagSet('area,br,col,hr,img,wbr');
// Elements that you can, intentionally, leave open (and which close themselves)
// https://html.spec.whatwg.org/#optional-tags
const OPTIONAL_END_TAG_BLOCK_ELEMENTS = tagSet('colgroup,dd,dt,li,p,tbody,td,tfoot,th,thead,tr');
const OPTIONAL_END_TAG_INLINE_ELEMENTS = tagSet('rp,rt');
const OPTIONAL_END_TAG_ELEMENTS = merge(OPTIONAL_END_TAG_INLINE_ELEMENTS, OPTIONAL_END_TAG_BLOCK_ELEMENTS);
// Safe Block Elements - HTML5
const BLOCK_ELEMENTS = merge(OPTIONAL_END_TAG_BLOCK_ELEMENTS, tagSet('address,article,' +
'aside,blockquote,caption,center,del,details,dialog,dir,div,dl,figure,figcaption,footer,h1,h2,h3,h4,h5,' +
'h6,header,hgroup,hr,ins,main,map,menu,nav,ol,pre,section,summary,table,ul'));
// Inline Elements - HTML5
const INLINE_ELEMENTS = merge(OPTIONAL_END_TAG_INLINE_ELEMENTS, tagSet('a,abbr,acronym,audio,b,' +
'bdi,bdo,big,br,cite,code,del,dfn,em,font,i,img,ins,kbd,label,map,mark,picture,q,ruby,rp,rt,s,' +
'samp,small,source,span,strike,strong,sub,sup,time,track,tt,u,var,video'));
export const VALID_ELEMENTS = merge(VOID_ELEMENTS, BLOCK_ELEMENTS, INLINE_ELEMENTS, OPTIONAL_END_TAG_ELEMENTS);
// Attributes that have href and hence need to be sanitized
export const URI_ATTRS = tagSet('background,cite,href,itemtype,longdesc,poster,src,xlink:href');
const HTML_ATTRS = tagSet('abbr,accesskey,align,alt,autoplay,axis,bgcolor,border,cellpadding,cellspacing,class,clear,color,cols,colspan,' +
'compact,controls,coords,datetime,default,dir,download,face,headers,height,hidden,hreflang,hspace,' +
'ismap,itemscope,itemprop,kind,label,lang,language,loop,media,muted,nohref,nowrap,open,preload,rel,rev,role,rows,rowspan,rules,' +
'scope,scrolling,shape,size,sizes,span,srclang,srcset,start,summary,tabindex,target,title,translate,type,usemap,' +
'valign,value,vspace,width');
// Accessibility attributes as per WAI-ARIA 1.1 (W3C Working Draft 14 December 2018)
const ARIA_ATTRS = tagSet('aria-activedescendant,aria-atomic,aria-autocomplete,aria-busy,aria-checked,aria-colcount,aria-colindex,' +
'aria-colspan,aria-controls,aria-current,aria-describedby,aria-details,aria-disabled,aria-dropeffect,' +
'aria-errormessage,aria-expanded,aria-flowto,aria-grabbed,aria-haspopup,aria-hidden,aria-invalid,' +
'aria-keyshortcuts,aria-label,aria-labelledby,aria-level,aria-live,aria-modal,aria-multiline,' +
'aria-multiselectable,aria-orientation,aria-owns,aria-placeholder,aria-posinset,aria-pressed,aria-readonly,' +
'aria-relevant,aria-required,aria-roledescription,aria-rowcount,aria-rowindex,aria-rowspan,aria-selected,' +
'aria-setsize,aria-sort,aria-valuemax,aria-valuemin,aria-valuenow,aria-valuetext');
// NB: This currently consciously doesn't support SVG. SVG sanitization has had several security
// issues in the past, so it seems safer to leave it out if possible. If support for binding SVG via
// innerHTML is required, SVG attributes should be added here.
// NB: Sanitization does not allow <form> elements or other active elements (<button> etc). Those
// can be sanitized, but they increase security surface area without a legitimate use case, so they
// are left out here.
export const VALID_ATTRS = merge(URI_ATTRS, HTML_ATTRS, ARIA_ATTRS);
// Elements whose content should not be traversed/preserved, if the elements themselves are invalid.
//
// Typically, `<invalid>Some content</invalid>` would traverse (and in this case preserve)
// `Some content`, but strip `invalid-element` opening/closing tags. For some elements, though, we
// don't want to preserve the content, if the elements themselves are going to be removed.
const SKIP_TRAVERSING_CONTENT_IF_INVALID_ELEMENTS = tagSet('script,style,template');
/**
* SanitizingHtmlSerializer serializes a DOM fragment, stripping out any unsafe elements and unsafe
* attributes.
*/
class SanitizingHtmlSerializer {
constructor() {
// Explicitly track if something was stripped, to avoid accidentally warning of sanitization just
// because characters were re-encoded.
this.sanitizedSomething = false;
this.buf = [];
}
sanitizeChildren(el) {
// This cannot use a TreeWalker, as it has to run on Angular's various DOM adapters.
// However this code never accesses properties off of `document` before deleting its contents
// again, so it shouldn't be vulnerable to DOM clobbering.
let current = el.firstChild;
let traverseContent = true;
let parentNodes = [];
while (current) {
if (current.nodeType === Node.ELEMENT_NODE) {
traverseContent = this.startElement(current);
}
else if (current.nodeType === Node.TEXT_NODE) {
this.chars(current.nodeValue);
}
else {
// Strip non-element, non-text nodes.
this.sanitizedSomething = true;
}
if (traverseContent && current.firstChild) {
// Push current node to the parent stack before entering its content.
parentNodes.push(current);
current = getFirstChild(current);
continue;
}
while (current) {
// Leaving the element.
// Walk up and to the right, closing tags as we go.
if (current.nodeType === Node.ELEMENT_NODE) {
this.endElement(current);
}
let next = getNextSibling(current);
if (next) {
current = next;
break;
}
// There was no next sibling, walk up to the parent node (extract it from the stack).
current = parentNodes.pop();
}
}
return this.buf.join('');
}
/**
* Sanitizes an opening element tag (if valid) and returns whether the element's contents should
* be traversed. Element content must always be traversed (even if the element itself is not
* valid/safe), unless the element is one of `SKIP_TRAVERSING_CONTENT_IF_INVALID_ELEMENTS`.
*
* @param element The element to sanitize.
* @return True if the element's contents should be traversed.
*/
startElement(element) {
const tagName = getNodeName(element).toLowerCase();
if (!VALID_ELEMENTS.hasOwnProperty(tagName)) {
this.sanitizedSomething = true;
return !SKIP_TRAVERSING_CONTENT_IF_INVALID_ELEMENTS.hasOwnProperty(tagName);
}
this.buf.push('<');
this.buf.push(tagName);
const elAttrs = element.attributes;
for (let i = 0; i < elAttrs.length; i++) {
const elAttr = elAttrs.item(i);
const attrName = elAttr.name;
const lower = attrName.toLowerCase();
if (!VALID_ATTRS.hasOwnProperty(lower)) {
this.sanitizedSomething = true;
continue;
}
let value = elAttr.value;
// TODO(martinprobst): Special case image URIs for data:image/...
if (URI_ATTRS[lower])
value = _sanitizeUrl(value);
this.buf.push(' ', attrName, '="', encodeEntities(value), '"');
}
this.buf.push('>');
return true;
}
endElement(current) {
const tagName = getNodeName(current).toLowerCase();
if (VALID_ELEMENTS.hasOwnProperty(tagName) && !VOID_ELEMENTS.hasOwnProperty(tagName)) {
this.buf.push('</');
this.buf.push(tagName);
this.buf.push('>');
}
}
chars(chars) {
this.buf.push(encodeEntities(chars));
}
}
/**
* Verifies whether a given child node is a descendant of a given parent node.
* It may not be the case when properties like `.firstChild` are clobbered and
* accessing `.firstChild` results in an unexpected node returned.
*/
function isClobberedElement(parentNode, childNode) {
return ((parentNode.compareDocumentPosition(childNode) & Node.DOCUMENT_POSITION_CONTAINED_BY) !==
Node.DOCUMENT_POSITION_CONTAINED_BY);
}
/**
* Retrieves next sibling node and makes sure that there is no
* clobbering of the `nextSibling` property happening.
*/
function getNextSibling(node) {
const nextSibling = node.nextSibling;
// Make sure there is no `nextSibling` clobbering: navigating to
// the next sibling and going back to the previous one should result
// in the original node.
if (nextSibling && node !== nextSibling.previousSibling) {
throw clobberedElementError(nextSibling);
}
return nextSibling;
}
/**
* Retrieves first child node and makes sure that there is no
* clobbering of the `firstChild` property happening.
*/
function getFirstChild(node) {
const firstChild = node.firstChild;
if (firstChild && isClobberedElement(node, firstChild)) {
throw clobberedElementError(firstChild);
}
return firstChild;
}
/** Gets a reasonable nodeName, even for clobbered nodes. */
export function getNodeName(node) {
const nodeName = node.nodeName;
// If the property is clobbered, assume it is an `HTMLFormElement`.
return typeof nodeName === 'string' ? nodeName : 'FORM';
}
function clobberedElementError(node) {
return new Error(`Failed to sanitize html because the element is clobbered: ${node.outerHTML}`);
}
// Regular Expressions for parsing tags and attributes
const SURROGATE_PAIR_REGEXP = /[\uD800-\uDBFF][\uDC00-\uDFFF]/g;
// ! to ~ is the ASCII range.
const NON_ALPHANUMERIC_REGEXP = /([^\#-~ |!])/g;
/**
* Escapes all potentially dangerous characters, so that the
* resulting string can be safely inserted into attribute or
* element text.
* @param value
*/
function encodeEntities(value) {
return value
.replace(/&/g, '&')
.replace(SURROGATE_PAIR_REGEXP, function (match) {
const hi = match.charCodeAt(0);
const low = match.charCodeAt(1);
return '&#' + ((hi - 0xd800) * 0x400 + (low - 0xdc00) + 0x10000) + ';';
})
.replace(NON_ALPHANUMERIC_REGEXP, function (match) {
return '&#' + match.charCodeAt(0) + ';';
})
.replace(/</g, '<')
.replace(/>/g, '>');
}
let inertBodyHelper;
/**
* Sanitizes the given unsafe, untrusted HTML fragment, and returns HTML text that is safe to add to
* the DOM in a browser environment.
*/
export function _sanitizeHtml(defaultDoc, unsafeHtmlInput) {
let inertBodyElement = null;
try {
inertBodyHelper = inertBodyHelper || getInertBodyHelper(defaultDoc);
// Make sure unsafeHtml is actually a string (TypeScript types are not enforced at runtime).
let unsafeHtml = unsafeHtmlInput ? String(unsafeHtmlInput) : '';
inertBodyElement = inertBodyHelper.getInertBodyElement(unsafeHtml);
// mXSS protection. Repeatedly parse the document to make sure it stabilizes, so that a browser
// trying to auto-correct incorrect HTML cannot cause formerly inert HTML to become dangerous.
let mXSSAttempts = 5;
let parsedHtml = unsafeHtml;
do {
if (mXSSAttempts === 0) {
throw new Error('Failed to sanitize html because the input is unstable');
}
mXSSAttempts--;
unsafeHtml = parsedHtml;
parsedHtml = inertBodyElement.innerHTML;
inertBodyElement = inertBodyHelper.getInertBodyElement(unsafeHtml);
} while (unsafeHtml !== parsedHtml);
const sanitizer = new SanitizingHtmlSerializer();
const safeHtml = sanitizer.sanitizeChildren(getTemplateContent(inertBodyElement) || inertBodyElement);
if ((typeof ngDevMode === 'undefined' || ngDevMode) && sanitizer.sanitizedSomething) {
console.warn(`WARNING: sanitizing HTML stripped some content, see ${XSS_SECURITY_URL}`);
}
return trustedHTMLFromString(safeHtml);
}
finally {
// In case anything goes wrong, clear out inertElement to reset the entire DOM structure.
if (inertBodyElement) {
const parent = getTemplateContent(inertBodyElement) || inertBodyElement;
while (parent.firstChild) {
parent.removeChild(parent.firstChild);
}
}
}
}
export function getTemplateContent(el) {
return 'content' in el /** Microsoft/TypeScript#21517 */ && isTemplateElement(el)
? el.content
: null;
}
function isTemplateElement(el) {
return el.nodeType === Node.ELEMENT_NODE && el.nodeName === 'TEMPLATE';
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {XSS_SECURITY_URL} from '../error_details_base_url';\nimport {TrustedHTML} from '../util/security/trusted_type_defs';\nimport {trustedHTMLFromString} from '../util/security/trusted_types';\n\nimport {getInertBodyHelper, InertBodyHelper} from './inert_body';\nimport {_sanitizeUrl} from './url_sanitizer';\n\nfunction tagSet(tags: string): {[k: string]: boolean} {\n  const res: {[k: string]: boolean} = {};\n  for (const t of tags.split(',')) res[t] = true;\n  return res;\n}\n\nfunction merge(...sets: {[k: string]: boolean}[]): {[k: string]: boolean} {\n  const res: {[k: string]: boolean} = {};\n  for (const s of sets) {\n    for (const v in s) {\n      if (s.hasOwnProperty(v)) res[v] = true;\n    }\n  }\n  return res;\n}\n\n// Good source of info about elements and attributes\n// https://html.spec.whatwg.org/#semantics\n// https://simon.html5.org/html-elements\n\n// Safe Void Elements - HTML5\n// https://html.spec.whatwg.org/#void-elements\nconst VOID_ELEMENTS = tagSet('area,br,col,hr,img,wbr');\n\n// Elements that you can, intentionally, leave open (and which close themselves)\n// https://html.spec.whatwg.org/#optional-tags\nconst OPTIONAL_END_TAG_BLOCK_ELEMENTS = tagSet('colgroup,dd,dt,li,p,tbody,td,tfoot,th,thead,tr');\nconst OPTIONAL_END_TAG_INLINE_ELEMENTS = tagSet('rp,rt');\nconst OPTIONAL_END_TAG_ELEMENTS = merge(\n  OPTIONAL_END_TAG_INLINE_ELEMENTS,\n  OPTIONAL_END_TAG_BLOCK_ELEMENTS,\n);\n\n// Safe Block Elements - HTML5\nconst BLOCK_ELEMENTS = merge(\n  OPTIONAL_END_TAG_BLOCK_ELEMENTS,\n  tagSet(\n    'address,article,' +\n      'aside,blockquote,caption,center,del,details,dialog,dir,div,dl,figure,figcaption,footer,h1,h2,h3,h4,h5,' +\n      'h6,header,hgroup,hr,ins,main,map,menu,nav,ol,pre,section,summary,table,ul',\n  ),\n);\n\n// Inline Elements - HTML5\nconst INLINE_ELEMENTS = merge(\n  OPTIONAL_END_TAG_INLINE_ELEMENTS,\n  tagSet(\n    'a,abbr,acronym,audio,b,' +\n      'bdi,bdo,big,br,cite,code,del,dfn,em,font,i,img,ins,kbd,label,map,mark,picture,q,ruby,rp,rt,s,' +\n      'samp,small,source,span,strike,strong,sub,sup,time,track,tt,u,var,video',\n  ),\n);\n\nexport const VALID_ELEMENTS = merge(\n  VOID_ELEMENTS,\n  BLOCK_ELEMENTS,\n  INLINE_ELEMENTS,\n  OPTIONAL_END_TAG_ELEMENTS,\n);\n\n// Attributes that have href and hence need to be sanitized\nexport const URI_ATTRS = tagSet('background,cite,href,itemtype,longdesc,poster,src,xlink:href');\n\nconst HTML_ATTRS = tagSet(\n  'abbr,accesskey,align,alt,autoplay,axis,bgcolor,border,cellpadding,cellspacing,class,clear,color,cols,colspan,' +\n    'compact,controls,coords,datetime,default,dir,download,face,headers,height,hidden,hreflang,hspace,' +\n    'ismap,itemscope,itemprop,kind,label,lang,language,loop,media,muted,nohref,nowrap,open,preload,rel,rev,role,rows,rowspan,rules,' +\n    'scope,scrolling,shape,size,sizes,span,srclang,srcset,start,summary,tabindex,target,title,translate,type,usemap,' +\n    'valign,value,vspace,width',\n);\n\n// Accessibility attributes as per WAI-ARIA 1.1 (W3C Working Draft 14 December 2018)\nconst ARIA_ATTRS = tagSet(\n  'aria-activedescendant,aria-atomic,aria-autocomplete,aria-busy,aria-checked,aria-colcount,aria-colindex,' +\n    'aria-colspan,aria-controls,aria-current,aria-describedby,aria-details,aria-disabled,aria-dropeffect,' +\n    'aria-errormessage,aria-expanded,aria-flowto,aria-grabbed,aria-haspopup,aria-hidden,aria-invalid,' +\n    'aria-keyshortcuts,aria-label,aria-labelledby,aria-level,aria-live,aria-modal,aria-multiline,' +\n    'aria-multiselectable,aria-orientation,aria-owns,aria-placeholder,aria-posinset,aria-pressed,aria-readonly,' +\n    'aria-relevant,aria-required,aria-roledescription,aria-rowcount,aria-rowindex,aria-rowspan,aria-selected,' +\n    'aria-setsize,aria-sort,aria-valuemax,aria-valuemin,aria-valuenow,aria-valuetext',\n);\n\n// NB: This currently consciously doesn't support SVG. SVG sanitization has had several security\n// issues in the past, so it seems safer to leave it out if possible. If support for binding SVG via\n// innerHTML is required, SVG attributes should be added here.\n\n// NB: Sanitization does not allow <form> elements or other active elements (<button> etc). Those\n// can be sanitized, but they increase security surface area without a legitimate use case, so they\n// are left out here.\n\nexport const VALID_ATTRS = merge(URI_ATTRS, HTML_ATTRS, ARIA_ATTRS);\n\n// Elements whose content should not be traversed/preserved, if the elements themselves are invalid.\n//\n// Typically, `<invalid>Some content</invalid>` would traverse (and in this case preserve)\n// `Some content`, but strip `invalid-element` opening/closing tags. For some elements, though, we\n// don't want to preserve the content, if the elements themselves are going to be removed.\nconst SKIP_TRAVERSING_CONTENT_IF_INVALID_ELEMENTS = tagSet('script,style,template');\n\n/**\n * SanitizingHtmlSerializer serializes a DOM fragment, stripping out any unsafe elements and unsafe\n * attributes.\n */\nclass SanitizingHtmlSerializer {\n  // Explicitly track if something was stripped, to avoid accidentally warning of sanitization just\n  // because characters were re-encoded.\n  public sanitizedSomething = false;\n  private buf: string[] = [];\n\n  sanitizeChildren(el: Element): string {\n    // This cannot use a TreeWalker, as it has to run on Angular's various DOM adapters.\n    // However this code never accesses properties off of `document` before deleting its contents\n    // again, so it shouldn't be vulnerable to DOM clobbering.\n    let current: Node = el.firstChild!;\n    let traverseContent = true;\n    let parentNodes = [];\n    while (current) {\n      if (current.nodeType === Node.ELEMENT_NODE) {\n        traverseContent = this.startElement(current as Element);\n      } else if (current.nodeType === Node.TEXT_NODE) {\n        this.chars(current.nodeValue!);\n      } else {\n        // Strip non-element, non-text nodes.\n        this.sanitizedSomething = true;\n      }\n      if (traverseContent && current.firstChild) {\n        // Push current node to the parent stack before entering its content.\n        parentNodes.push(current);\n        current = getFirstChild(current)!;\n        continue;\n      }\n      while (current) {\n        // Leaving the element.\n        // Walk up and to the right, closing tags as we go.\n        if (current.nodeType === Node.ELEMENT_NODE) {\n          this.endElement(current as Element);\n        }\n\n        let next = getNextSibling(current)!;\n\n        if (next) {\n          current = next;\n          break;\n        }\n\n        // There was no next sibling, walk up to the parent node (extract it from the stack).\n        current = parentNodes.pop()!;\n      }\n    }\n    return this.buf.join('');\n  }\n\n  /**\n   * Sanitizes an opening element tag (if valid) and returns whether the element's contents should\n   * be traversed. Element content must always be traversed (even if the element itself is not\n   * valid/safe), unless the element is one of `SKIP_TRAVERSING_CONTENT_IF_INVALID_ELEMENTS`.\n   *\n   * @param element The element to sanitize.\n   * @return True if the element's contents should be traversed.\n   */\n  private startElement(element: Element): boolean {\n    const tagName = getNodeName(element).toLowerCase();\n    if (!VALID_ELEMENTS.hasOwnProperty(tagName)) {\n      this.sanitizedSomething = true;\n      return !SKIP_TRAVERSING_CONTENT_IF_INVALID_ELEMENTS.hasOwnProperty(tagName);\n    }\n    this.buf.push('<');\n    this.buf.push(tagName);\n    const elAttrs = element.attributes;\n    for (let i = 0; i < elAttrs.length; i++) {\n      const elAttr = elAttrs.item(i);\n      const attrName = elAttr!.name;\n      const lower = attrName.toLowerCase();\n      if (!VALID_ATTRS.hasOwnProperty(lower)) {\n        this.sanitizedSomething = true;\n        continue;\n      }\n      let value = elAttr!.value;\n      // TODO(martinprobst): Special case image URIs for data:image/...\n      if (URI_ATTRS[lower]) value = _sanitizeUrl(value);\n      this.buf.push(' ', attrName, '=\"', encodeEntities(value), '\"');\n    }\n    this.buf.push('>');\n    return true;\n  }\n\n  private endElement(current: Element) {\n    const tagName = getNodeName(current).toLowerCase();\n    if (VALID_ELEMENTS.hasOwnProperty(tagName) && !VOID_ELEMENTS.hasOwnProperty(tagName)) {\n      this.buf.push('</');\n      this.buf.push(tagName);\n      this.buf.push('>');\n    }\n  }\n\n  private chars(chars: string) {\n    this.buf.push(encodeEntities(chars));\n  }\n}\n\n/**\n * Verifies whether a given child node is a descendant of a given parent node.\n * It may not be the case when properties like `.firstChild` are clobbered and\n * accessing `.firstChild` results in an unexpected node returned.\n */\nfunction isClobberedElement(parentNode: Node, childNode: Node): boolean {\n  return (\n    (parentNode.compareDocumentPosition(childNode) & Node.DOCUMENT_POSITION_CONTAINED_BY) !==\n    Node.DOCUMENT_POSITION_CONTAINED_BY\n  );\n}\n\n/**\n * Retrieves next sibling node and makes sure that there is no\n * clobbering of the `nextSibling` property happening.\n */\nfunction getNextSibling(node: Node): Node | null {\n  const nextSibling = node.nextSibling;\n  // Make sure there is no `nextSibling` clobbering: navigating to\n  // the next sibling and going back to the previous one should result\n  // in the original node.\n  if (nextSibling && node !== nextSibling.previousSibling) {\n    throw clobberedElementError(nextSibling);\n  }\n  return nextSibling;\n}\n\n/**\n * Retrieves first child node and makes sure that there is no\n * clobbering of the `firstChild` property happening.\n */\nfunction getFirstChild(node: Node): Node | null {\n  const firstChild = node.firstChild;\n  if (firstChild && isClobberedElement(node, firstChild)) {\n    throw clobberedElementError(firstChild);\n  }\n  return firstChild;\n}\n\n/** Gets a reasonable nodeName, even for clobbered nodes. */\nexport function getNodeName(node: Node): string {\n  const nodeName = node.nodeName;\n  // If the property is clobbered, assume it is an `HTMLFormElement`.\n  return typeof nodeName === 'string' ? nodeName : 'FORM';\n}\n\nfunction clobberedElementError(node: Node) {\n  return new Error(\n    `Failed to sanitize html because the element is clobbered: ${(node as Element).outerHTML}`,\n  );\n}\n\n// Regular Expressions for parsing tags and attributes\nconst SURROGATE_PAIR_REGEXP = /[\\uD800-\\uDBFF][\\uDC00-\\uDFFF]/g;\n// ! to ~ is the ASCII range.\nconst NON_ALPHANUMERIC_REGEXP = /([^\\#-~ |!])/g;\n\n/**\n * Escapes all potentially dangerous characters, so that the\n * resulting string can be safely inserted into attribute or\n * element text.\n * @param value\n */\nfunction encodeEntities(value: string) {\n  return value\n    .replace(/&/g, '&amp;')\n    .replace(SURROGATE_PAIR_REGEXP, function (match: string) {\n      const hi = match.charCodeAt(0);\n      const low = match.charCodeAt(1);\n      return '&#' + ((hi - 0xd800) * 0x400 + (low - 0xdc00) + 0x10000) + ';';\n    })\n    .replace(NON_ALPHANUMERIC_REGEXP, function (match: string) {\n      return '&#' + match.charCodeAt(0) + ';';\n    })\n    .replace(/</g, '&lt;')\n    .replace(/>/g, '&gt;');\n}\n\nlet inertBodyHelper: InertBodyHelper;\n\n/**\n * Sanitizes the given unsafe, untrusted HTML fragment, and returns HTML text that is safe to add to\n * the DOM in a browser environment.\n */\nexport function _sanitizeHtml(defaultDoc: any, unsafeHtmlInput: string): TrustedHTML | string {\n  let inertBodyElement: HTMLElement | null = null;\n  try {\n    inertBodyHelper = inertBodyHelper || getInertBodyHelper(defaultDoc);\n    // Make sure unsafeHtml is actually a string (TypeScript types are not enforced at runtime).\n    let unsafeHtml = unsafeHtmlInput ? String(unsafeHtmlInput) : '';\n    inertBodyElement = inertBodyHelper.getInertBodyElement(unsafeHtml);\n\n    // mXSS protection. Repeatedly parse the document to make sure it stabilizes, so that a browser\n    // trying to auto-correct incorrect HTML cannot cause formerly inert HTML to become dangerous.\n    let mXSSAttempts = 5;\n    let parsedHtml = unsafeHtml;\n\n    do {\n      if (mXSSAttempts === 0) {\n        throw new Error('Failed to sanitize html because the input is unstable');\n      }\n      mXSSAttempts--;\n\n      unsafeHtml = parsedHtml;\n      parsedHtml = inertBodyElement!.innerHTML;\n      inertBodyElement = inertBodyHelper.getInertBodyElement(unsafeHtml);\n    } while (unsafeHtml !== parsedHtml);\n\n    const sanitizer = new SanitizingHtmlSerializer();\n    const safeHtml = sanitizer.sanitizeChildren(\n      (getTemplateContent(inertBodyElement!) as Element) || inertBodyElement,\n    );\n    if ((typeof ngDevMode === 'undefined' || ngDevMode) && sanitizer.sanitizedSomething) {\n      console.warn(`WARNING: sanitizing HTML stripped some content, see ${XSS_SECURITY_URL}`);\n    }\n\n    return trustedHTMLFromString(safeHtml);\n  } finally {\n    // In case anything goes wrong, clear out inertElement to reset the entire DOM structure.\n    if (inertBodyElement) {\n      const parent = getTemplateContent(inertBodyElement) || inertBodyElement;\n      while (parent.firstChild) {\n        parent.removeChild(parent.firstChild);\n      }\n    }\n  }\n}\n\nexport function getTemplateContent(el: Node): Node | null {\n  return 'content' in (el as any) /** Microsoft/TypeScript#21517 */ && isTemplateElement(el)\n    ? el.content\n    : null;\n}\nfunction isTemplateElement(el: Node): el is HTMLTemplateElement {\n  return el.nodeType === Node.ELEMENT_NODE && el.nodeName === 'TEMPLATE';\n}\n"]}