@angular/core/esm2020/src/sanitization/html_sanitizer.mjs

Angular - the core framework

/**
 * @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;
        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) {
                current = current.firstChild;
                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 = this.checkClobberedElement(current, current.nextSibling);
                if (next) {
                    current = next;
                    break;
                }
                current = this.checkClobberedElement(current, current.parentNode);
            }
        }
        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 = element.nodeName.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 = current.nodeName.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));
    }
    checkClobberedElement(node, nextNode) {
        if (nextNode &&
            (node.compareDocumentPosition(nextNode) &
                Node.DOCUMENT_POSITION_CONTAINED_BY) === Node.DOCUMENT_POSITION_CONTAINED_BY) {
            throw new Error(`Failed to sanitize html because the element is clobbered: ${node.outerHTML}`);
        }
        return nextNode;
    }
}
// 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, '&amp;')
        .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, '&lt;')
        .replace(/>/g, '&gt;');
}
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 =\n    merge(OPTIONAL_END_TAG_INLINE_ELEMENTS, OPTIONAL_END_TAG_BLOCK_ELEMENTS);\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// 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\nexport const VALID_ELEMENTS =\n    merge(VOID_ELEMENTS, BLOCK_ELEMENTS, INLINE_ELEMENTS, OPTIONAL_END_TAG_ELEMENTS);\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// 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// 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    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        current = current.firstChild!;\n        continue;\n      }\n      while (current) {\n        // Leaving the element. 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 = this.checkClobberedElement(current, current.nextSibling!);\n\n        if (next) {\n          current = next;\n          break;\n        }\n\n        current = this.checkClobberedElement(current, current.parentNode!);\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 = element.nodeName.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 = current.nodeName.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  checkClobberedElement(node: Node, nextNode: Node): Node {\n    if (nextNode &&\n        (node.compareDocumentPosition(nextNode) &\n         Node.DOCUMENT_POSITION_CONTAINED_BY) === Node.DOCUMENT_POSITION_CONTAINED_BY) {\n      throw new Error(`Failed to sanitize html because the element is clobbered: ${\n          (node as Element).outerHTML}`);\n    }\n    return nextNode;\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.replace(/&/g, '&amp;')\n      .replace(\n          SURROGATE_PAIR_REGEXP,\n          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(\n          NON_ALPHANUMERIC_REGEXP,\n          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    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"]}