/**
* @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 { trustedHTMLFromString } from '../util/security/trusted_types';
/**
* This helper is used to get hold of an inert tree of DOM elements containing dirty HTML
* that needs sanitizing.
* Depending upon browser support we use one of two strategies for doing this.
* Default: DOMParser strategy
* Fallback: InertDocument strategy
*/
export function getInertBodyHelper(defaultDoc) {
const inertDocumentHelper = new InertDocumentHelper(defaultDoc);
return isDOMParserAvailable() ? new DOMParserHelper(inertDocumentHelper) : inertDocumentHelper;
}
/**
* Uses DOMParser to create and fill an inert body element.
* This is the default strategy used in browsers that support it.
*/
class DOMParserHelper {
constructor(inertDocumentHelper) {
this.inertDocumentHelper = inertDocumentHelper;
}
getInertBodyElement(html) {
// We add these extra elements to ensure that the rest of the content is parsed as expected
// e.g. leading whitespace is maintained and tags like `` do not get hoisted to the
// `` tag. Note that the `` tag is closed implicitly to prevent unclosed tags
// in `html` from consuming the otherwise explicit `` tag.
html = '' + html;
try {
const body = new window.DOMParser()
.parseFromString(trustedHTMLFromString(html), 'text/html')
.body;
if (body === null) {
// In some browsers (e.g. Mozilla/5.0 iPad AppleWebKit Mobile) the `body` property only
// becomes available in the following tick of the JS engine. In that case we fall back to
// the `inertDocumentHelper` instead.
return this.inertDocumentHelper.getInertBodyElement(html);
}
body.removeChild(body.firstChild);
return body;
}
catch {
return null;
}
}
}
/**
* Use an HTML5 `template` element, if supported, or an inert body element created via
* `createHtmlDocument` to create and fill an inert DOM element.
* This is the fallback strategy if the browser does not support DOMParser.
*/
class InertDocumentHelper {
constructor(defaultDoc) {
this.defaultDoc = defaultDoc;
this.inertDocument = this.defaultDoc.implementation.createHTMLDocument('sanitization-inert');
if (this.inertDocument.body == null) {
// usually there should be only one body element in the document, but IE doesn't have any, so
// we need to create one.
const inertHtml = this.inertDocument.createElement('html');
this.inertDocument.appendChild(inertHtml);
const inertBodyElement = this.inertDocument.createElement('body');
inertHtml.appendChild(inertBodyElement);
}
}
getInertBodyElement(html) {
// Prefer using element if supported.
const templateEl = this.inertDocument.createElement('template');
if ('content' in templateEl) {
templateEl.innerHTML = trustedHTMLFromString(html);
return templateEl;
}
// Note that previously we used to do something like `this.inertDocument.body.innerHTML = html`
// and we returned the inert `body` node. This was changed, because IE seems to treat setting
// `innerHTML` on an inserted element differently, compared to one that hasn't been inserted
// yet. In particular, IE appears to split some of the text into multiple text nodes rather
// than keeping them in a single one which ends up messing with Ivy's i18n parsing further
// down the line. This has been worked around by creating a new inert `body` and using it as
// the root node in which we insert the HTML.
const inertBody = this.inertDocument.createElement('body');
inertBody.innerHTML = trustedHTMLFromString(html);
// Support: IE 11 only
// strip custom-namespaced attributes on IE<=11
if (this.defaultDoc.documentMode) {
this.stripCustomNsAttrs(inertBody);
}
return inertBody;
}
/**
* When IE11 comes across an unknown namespaced attribute e.g. 'xlink:foo' it adds 'xmlns:ns1'
* attribute to declare ns1 namespace and prefixes the attribute with 'ns1' (e.g.
* 'ns1:xlink:foo').
*
* This is undesirable since we don't want to allow any of these custom attributes. This method
* strips them all.
*/
stripCustomNsAttrs(el) {
const elAttrs = el.attributes;
// loop backwards so that we can support removals.
for (let i = elAttrs.length - 1; 0 < i; i--) {
const attrib = elAttrs.item(i);
const attrName = attrib.name;
if (attrName === 'xmlns:ns1' || attrName.indexOf('ns1:') === 0) {
el.removeAttribute(attrName);
}
}
let childNode = el.firstChild;
while (childNode) {
if (childNode.nodeType === Node.ELEMENT_NODE)
this.stripCustomNsAttrs(childNode);
childNode = childNode.nextSibling;
}
}
}
/**
* We need to determine whether the DOMParser exists in the global context and
* supports parsing HTML; HTML parsing support is not as wide as other formats, see
* https://developer.mozilla.org/en-US/docs/Web/API/DOMParser#Browser_compatibility.
*
* @suppress {uselessCode}
*/
export function isDOMParserAvailable() {
try {
return !!new window.DOMParser().parseFromString(trustedHTMLFromString(''), 'text/html');
}
catch {
return false;
}
}
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Note that the `<body>` tag is closed implicitly to prevent unclosed tags\n    // in `html` from consuming the otherwise explicit `</body>` tag.\n    html = '<body><remove></remove>' + html;\n    try {\n      const body = new window.DOMParser()\n                       .parseFromString(trustedHTMLFromString(html) as string, 'text/html')\n                       .body as HTMLBodyElement;\n      if (body === null) {\n        // In some browsers (e.g. Mozilla/5.0 iPad AppleWebKit Mobile) the `body` property only\n        // becomes available in the following tick of the JS engine. In that case we fall back to\n        // the `inertDocumentHelper` instead.\n        return this.inertDocumentHelper.getInertBodyElement(html);\n      }\n      body.removeChild(body.firstChild!);\n      return body;\n    } catch {\n      return null;\n    }\n  }\n}\n\n/**\n * Use an HTML5 `template` element, if supported, or an inert body element created via\n * `createHtmlDocument` to create and fill an inert DOM element.\n * This is the fallback strategy if the browser does not support DOMParser.\n */\nclass InertDocumentHelper implements InertBodyHelper {\n  private inertDocument: Document;\n\n  constructor(private defaultDoc: Document) {\n    this.inertDocument = this.defaultDoc.implementation.createHTMLDocument('sanitization-inert');\n\n    if (this.inertDocument.body == null) {\n      // usually there should be only one body element in the document, but IE doesn't have any, so\n      // we need to create one.\n      const inertHtml = this.inertDocument.createElement('html');\n      this.inertDocument.appendChild(inertHtml);\n      const inertBodyElement = this.inertDocument.createElement('body');\n      inertHtml.appendChild(inertBodyElement);\n    }\n  }\n\n  getInertBodyElement(html: string): HTMLElement|null {\n    // Prefer using <template> element if supported.\n    const templateEl = this.inertDocument.createElement('template');\n    if ('content' in templateEl) {\n      templateEl.innerHTML = trustedHTMLFromString(html) as string;\n      return templateEl;\n    }\n\n    // Note that previously we used to do something like `this.inertDocument.body.innerHTML = html`\n    // and we returned the inert `body` node. This was changed, because IE seems to treat setting\n    // `innerHTML` on an inserted element differently, compared to one that hasn't been inserted\n    // yet. In particular, IE appears to split some of the text into multiple text nodes rather\n    // than keeping them in a single one which ends up messing with Ivy's i18n parsing further\n    // down the line. This has been worked around by creating a new inert `body` and using it as\n    // the root node in which we insert the HTML.\n    const inertBody = this.inertDocument.createElement('body');\n    inertBody.innerHTML = trustedHTMLFromString(html) as string;\n\n    // Support: IE 11 only\n    // strip custom-namespaced attributes on IE<=11\n    if ((this.defaultDoc as any).documentMode) {\n      this.stripCustomNsAttrs(inertBody);\n    }\n\n    return inertBody;\n  }\n\n  /**\n   * When IE11 comes across an unknown namespaced attribute e.g. 'xlink:foo' it adds 'xmlns:ns1'\n   * attribute to declare ns1 namespace and prefixes the attribute with 'ns1' (e.g.\n   * 'ns1:xlink:foo').\n   *\n   * This is undesirable since we don't want to allow any of these custom attributes. This method\n   * strips them all.\n   */\n  private stripCustomNsAttrs(el: Element) {\n    const elAttrs = el.attributes;\n    // loop backwards so that we can support removals.\n    for (let i = elAttrs.length - 1; 0 < i; i--) {\n      const attrib = elAttrs.item(i);\n      const attrName = attrib!.name;\n      if (attrName === 'xmlns:ns1' || attrName.indexOf('ns1:') === 0) {\n        el.removeAttribute(attrName);\n      }\n    }\n    let childNode = el.firstChild as Node | null;\n    while (childNode) {\n      if (childNode.nodeType === Node.ELEMENT_NODE) this.stripCustomNsAttrs(childNode as Element);\n      childNode = childNode.nextSibling;\n    }\n  }\n}\n\n/**\n * We need to determine whether the DOMParser exists in the global context and\n * supports parsing HTML; HTML parsing support is not as wide as other formats, see\n * https://developer.mozilla.org/en-US/docs/Web/API/DOMParser#Browser_compatibility.\n *\n * @suppress {uselessCode}\n */\nexport function isDOMParserAvailable() {\n  try {\n    return !!new window.DOMParser().parseFromString(\n        trustedHTMLFromString('') as string, 'text/html');\n  } catch {\n    return false;\n  }\n}\n"]}