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1/**
2 * @license
3 * Copyright Google LLC All Rights Reserved.
4 *
5 * Use of this source code is governed by an MIT-style license that can be
6 * found in the LICENSE file at https://angular.io/license
7 */
8import { trustedHTMLFromString } from '../util/security/trusted_types';
9import { getInertBodyHelper } from './inert_body';
10import { _sanitizeUrl, sanitizeSrcset } from './url_sanitizer';
11function tagSet(tags) {
12 const res = {};
13 for (const t of tags.split(','))
14 res[t] = true;
15 return res;
16}
17function merge(...sets) {
18 const res = {};
19 for (const s of sets) {
20 for (const v in s) {
21 if (s.hasOwnProperty(v))
22 res[v] = true;
23 }
24 }
25 return res;
26}
27// Good source of info about elements and attributes
28// https://html.spec.whatwg.org/#semantics
29// https://simon.html5.org/html-elements
30// Safe Void Elements - HTML5
31// https://html.spec.whatwg.org/#void-elements
32const VOID_ELEMENTS = tagSet('area,br,col,hr,img,wbr');
33// Elements that you can, intentionally, leave open (and which close themselves)
34// https://html.spec.whatwg.org/#optional-tags
35const OPTIONAL_END_TAG_BLOCK_ELEMENTS = tagSet('colgroup,dd,dt,li,p,tbody,td,tfoot,th,thead,tr');
36const OPTIONAL_END_TAG_INLINE_ELEMENTS = tagSet('rp,rt');
37const OPTIONAL_END_TAG_ELEMENTS = merge(OPTIONAL_END_TAG_INLINE_ELEMENTS, OPTIONAL_END_TAG_BLOCK_ELEMENTS);
38// Safe Block Elements - HTML5
39const BLOCK_ELEMENTS = merge(OPTIONAL_END_TAG_BLOCK_ELEMENTS, tagSet('address,article,' +
40 'aside,blockquote,caption,center,del,details,dialog,dir,div,dl,figure,figcaption,footer,h1,h2,h3,h4,h5,' +
41 'h6,header,hgroup,hr,ins,main,map,menu,nav,ol,pre,section,summary,table,ul'));
42// Inline Elements - HTML5
43const INLINE_ELEMENTS = merge(OPTIONAL_END_TAG_INLINE_ELEMENTS, tagSet('a,abbr,acronym,audio,b,' +
44 'bdi,bdo,big,br,cite,code,del,dfn,em,font,i,img,ins,kbd,label,map,mark,picture,q,ruby,rp,rt,s,' +
45 'samp,small,source,span,strike,strong,sub,sup,time,track,tt,u,var,video'));
46export const VALID_ELEMENTS = merge(VOID_ELEMENTS, BLOCK_ELEMENTS, INLINE_ELEMENTS, OPTIONAL_END_TAG_ELEMENTS);
47// Attributes that have href and hence need to be sanitized
48export const URI_ATTRS = tagSet('background,cite,href,itemtype,longdesc,poster,src,xlink:href');
49// Attributes that have special href set hence need to be sanitized
50export const SRCSET_ATTRS = tagSet('srcset');
51const HTML_ATTRS = tagSet('abbr,accesskey,align,alt,autoplay,axis,bgcolor,border,cellpadding,cellspacing,class,clear,color,cols,colspan,' +
52 'compact,controls,coords,datetime,default,dir,download,face,headers,height,hidden,hreflang,hspace,' +
53 'ismap,itemscope,itemprop,kind,label,lang,language,loop,media,muted,nohref,nowrap,open,preload,rel,rev,role,rows,rowspan,rules,' +
54 'scope,scrolling,shape,size,sizes,span,srclang,start,summary,tabindex,target,title,translate,type,usemap,' +
55 'valign,value,vspace,width');
56// Accessibility attributes as per WAI-ARIA 1.1 (W3C Working Draft 14 December 2018)
57const ARIA_ATTRS = tagSet('aria-activedescendant,aria-atomic,aria-autocomplete,aria-busy,aria-checked,aria-colcount,aria-colindex,' +
58 'aria-colspan,aria-controls,aria-current,aria-describedby,aria-details,aria-disabled,aria-dropeffect,' +
59 'aria-errormessage,aria-expanded,aria-flowto,aria-grabbed,aria-haspopup,aria-hidden,aria-invalid,' +
60 'aria-keyshortcuts,aria-label,aria-labelledby,aria-level,aria-live,aria-modal,aria-multiline,' +
61 'aria-multiselectable,aria-orientation,aria-owns,aria-placeholder,aria-posinset,aria-pressed,aria-readonly,' +
62 'aria-relevant,aria-required,aria-roledescription,aria-rowcount,aria-rowindex,aria-rowspan,aria-selected,' +
63 'aria-setsize,aria-sort,aria-valuemax,aria-valuemin,aria-valuenow,aria-valuetext');
64// NB: This currently consciously doesn't support SVG. SVG sanitization has had several security
65// issues in the past, so it seems safer to leave it out if possible. If support for binding SVG via
66// innerHTML is required, SVG attributes should be added here.
67// NB: Sanitization does not allow <form> elements or other active elements (<button> etc). Those
68// can be sanitized, but they increase security surface area without a legitimate use case, so they
69// are left out here.
70export const VALID_ATTRS = merge(URI_ATTRS, SRCSET_ATTRS, HTML_ATTRS, ARIA_ATTRS);
71// Elements whose content should not be traversed/preserved, if the elements themselves are invalid.
72//
73// Typically, `<invalid>Some content</invalid>` would traverse (and in this case preserve)
74// `Some content`, but strip `invalid-element` opening/closing tags. For some elements, though, we
75// don't want to preserve the content, if the elements themselves are going to be removed.
76const SKIP_TRAVERSING_CONTENT_IF_INVALID_ELEMENTS = tagSet('script,style,template');
77/**
78 * SanitizingHtmlSerializer serializes a DOM fragment, stripping out any unsafe elements and unsafe
79 * attributes.
80 */
81class SanitizingHtmlSerializer {
82 constructor() {
83 // Explicitly track if something was stripped, to avoid accidentally warning of sanitization just
84 // because characters were re-encoded.
85 this.sanitizedSomething = false;
86 this.buf = [];
87 }
88 sanitizeChildren(el) {
89 // This cannot use a TreeWalker, as it has to run on Angular's various DOM adapters.
90 // However this code never accesses properties off of `document` before deleting its contents
91 // again, so it shouldn't be vulnerable to DOM clobbering.
92 let current = el.firstChild;
93 let traverseContent = true;
94 while (current) {
95 if (current.nodeType === Node.ELEMENT_NODE) {
96 traverseContent = this.startElement(current);
97 }
98 else if (current.nodeType === Node.TEXT_NODE) {
99 this.chars(current.nodeValue);
100 }
101 else {
102 // Strip non-element, non-text nodes.
103 this.sanitizedSomething = true;
104 }
105 if (traverseContent && current.firstChild) {
106 current = current.firstChild;
107 continue;
108 }
109 while (current) {
110 // Leaving the element. Walk up and to the right, closing tags as we go.
111 if (current.nodeType === Node.ELEMENT_NODE) {
112 this.endElement(current);
113 }
114 let next = this.checkClobberedElement(current, current.nextSibling);
115 if (next) {
116 current = next;
117 break;
118 }
119 current = this.checkClobberedElement(current, current.parentNode);
120 }
121 }
122 return this.buf.join('');
123 }
124 /**
125 * Sanitizes an opening element tag (if valid) and returns whether the element's contents should
126 * be traversed. Element content must always be traversed (even if the element itself is not
127 * valid/safe), unless the element is one of `SKIP_TRAVERSING_CONTENT_IF_INVALID_ELEMENTS`.
128 *
129 * @param element The element to sanitize.
130 * @return True if the element's contents should be traversed.
131 */
132 startElement(element) {
133 const tagName = element.nodeName.toLowerCase();
134 if (!VALID_ELEMENTS.hasOwnProperty(tagName)) {
135 this.sanitizedSomething = true;
136 return !SKIP_TRAVERSING_CONTENT_IF_INVALID_ELEMENTS.hasOwnProperty(tagName);
137 }
138 this.buf.push('<');
139 this.buf.push(tagName);
140 const elAttrs = element.attributes;
141 for (let i = 0; i < elAttrs.length; i++) {
142 const elAttr = elAttrs.item(i);
143 const attrName = elAttr.name;
144 const lower = attrName.toLowerCase();
145 if (!VALID_ATTRS.hasOwnProperty(lower)) {
146 this.sanitizedSomething = true;
147 continue;
148 }
149 let value = elAttr.value;
150 // TODO(martinprobst): Special case image URIs for data:image/...
151 if (URI_ATTRS[lower])
152 value = _sanitizeUrl(value);
153 if (SRCSET_ATTRS[lower])
154 value = sanitizeSrcset(value);
155 this.buf.push(' ', attrName, '="', encodeEntities(value), '"');
156 }
157 this.buf.push('>');
158 return true;
159 }
160 endElement(current) {
161 const tagName = current.nodeName.toLowerCase();
162 if (VALID_ELEMENTS.hasOwnProperty(tagName) && !VOID_ELEMENTS.hasOwnProperty(tagName)) {
163 this.buf.push('</');
164 this.buf.push(tagName);
165 this.buf.push('>');
166 }
167 }
168 chars(chars) {
169 this.buf.push(encodeEntities(chars));
170 }
171 checkClobberedElement(node, nextNode) {
172 if (nextNode &&
173 (node.compareDocumentPosition(nextNode) &
174 Node.DOCUMENT_POSITION_CONTAINED_BY) === Node.DOCUMENT_POSITION_CONTAINED_BY) {
175 throw new Error(`Failed to sanitize html because the element is clobbered: ${node.outerHTML}`);
176 }
177 return nextNode;
178 }
179}
180// Regular Expressions for parsing tags and attributes
181const SURROGATE_PAIR_REGEXP = /[\uD800-\uDBFF][\uDC00-\uDFFF]/g;
182// ! to ~ is the ASCII range.
183const NON_ALPHANUMERIC_REGEXP = /([^\#-~ |!])/g;
184/**
185 * Escapes all potentially dangerous characters, so that the
186 * resulting string can be safely inserted into attribute or
187 * element text.
188 * @param value
189 */
190function encodeEntities(value) {
191 return value.replace(/&/g, '&amp;')
192 .replace(SURROGATE_PAIR_REGEXP, function (match) {
193 const hi = match.charCodeAt(0);
194 const low = match.charCodeAt(1);
195 return '&#' + (((hi - 0xD800) * 0x400) + (low - 0xDC00) + 0x10000) + ';';
196 })
197 .replace(NON_ALPHANUMERIC_REGEXP, function (match) {
198 return '&#' + match.charCodeAt(0) + ';';
199 })
200 .replace(/</g, '&lt;')
201 .replace(/>/g, '&gt;');
202}
203let inertBodyHelper;
204/**
205 * Sanitizes the given unsafe, untrusted HTML fragment, and returns HTML text that is safe to add to
206 * the DOM in a browser environment.
207 */
208export function _sanitizeHtml(defaultDoc, unsafeHtmlInput) {
209 let inertBodyElement = null;
210 try {
211 inertBodyHelper = inertBodyHelper || getInertBodyHelper(defaultDoc);
212 // Make sure unsafeHtml is actually a string (TypeScript types are not enforced at runtime).
213 let unsafeHtml = unsafeHtmlInput ? String(unsafeHtmlInput) : '';
214 inertBodyElement = inertBodyHelper.getInertBodyElement(unsafeHtml);
215 // mXSS protection. Repeatedly parse the document to make sure it stabilizes, so that a browser
216 // trying to auto-correct incorrect HTML cannot cause formerly inert HTML to become dangerous.
217 let mXSSAttempts = 5;
218 let parsedHtml = unsafeHtml;
219 do {
220 if (mXSSAttempts === 0) {
221 throw new Error('Failed to sanitize html because the input is unstable');
222 }
223 mXSSAttempts--;
224 unsafeHtml = parsedHtml;
225 parsedHtml = inertBodyElement.innerHTML;
226 inertBodyElement = inertBodyHelper.getInertBodyElement(unsafeHtml);
227 } while (unsafeHtml !== parsedHtml);
228 const sanitizer = new SanitizingHtmlSerializer();
229 const safeHtml = sanitizer.sanitizeChildren(getTemplateContent(inertBodyElement) || inertBodyElement);
230 if ((typeof ngDevMode === 'undefined' || ngDevMode) && sanitizer.sanitizedSomething) {
231 console.warn('WARNING: sanitizing HTML stripped some content, see https://g.co/ng/security#xss');
232 }
233 return trustedHTMLFromString(safeHtml);
234 }
235 finally {
236 // In case anything goes wrong, clear out inertElement to reset the entire DOM structure.
237 if (inertBodyElement) {
238 const parent = getTemplateContent(inertBodyElement) || inertBodyElement;
239 while (parent.firstChild) {
240 parent.removeChild(parent.firstChild);
241 }
242 }
243 }
244}
245export function getTemplateContent(el) {
246 return 'content' in el /** Microsoft/TypeScript#21517 */ && isTemplateElement(el) ?
247 el.content :
248 null;
249}
250function isTemplateElement(el) {
251 return el.nodeType === Node.ELEMENT_NODE && el.nodeName === 'TEMPLATE';
252}
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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 {TrustedHTML} from '../util/security/trusted_type_defs';\nimport {trustedHTMLFromString} from '../util/security/trusted_types';\nimport {getInertBodyHelper, InertBodyHelper} from './inert_body';\nimport {_sanitizeUrl, sanitizeSrcset} 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\n// Attributes that have special href set hence need to be sanitized\nexport const SRCSET_ATTRS = tagSet('srcset');\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,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, SRCSET_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      if (SRCSET_ATTRS[lower]) value = sanitizeSrcset(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(\n          'WARNING: sanitizing HTML stripped some content, see https://g.co/ng/security#xss');\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"]}
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