tests/lib_2/html/node_validator_important_if_you_suppress_make_the_bug_critical_test.dart - sdk.git - Git at Google

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.

 // @dart = 2.9

 /// This tests HTML validation and sanitization, which is very important
 /// for prevent XSS or other attacks. If you suppress this, or parts of it
 /// please make it a critical bug and bring it to the attention of the
 /// dart:html maintainers.
 library node_validator_test;

 import 'dart:html';
 import 'dart:svg' as svg;

 import 'package:expect/minitest.dart';

 import 'utils.dart';

 void validateHtml(String html, String reference, NodeValidator validator) {
   var a = document.body.createFragment(html, validator: validator);
   var b = document.body
       .createFragment(reference, treeSanitizer: NodeTreeSanitizer.trusted);

   // Prevent a false pass when both the html and the reference both get entirely
   // deleted, which is technically a match, but unlikely to be what we meant.
   if (reference != '') {
     expect(b.childNodes.length > 0, isTrue);
   }
   validateNodeTree(a, b);
 }

 class RecordingUriValidator implements UriPolicy {
   final List<String> calls = <String>[];

   bool allowsUri(String uri) {
     calls.add('$uri');
     return false;
   }

   void reset() {
     calls.clear();
   }
 }

 void testHtml(String name, NodeValidator validator, String html,
     [String reference]) {
   test(name, () {
     if (reference == null) {
       reference = html;
     }

     validateHtml(html, reference, validator);
   });
 }

 main() {
   group('DOM_sanitization', () {
     var validator = new NodeValidatorBuilder.common();

     testHtml('allows simple constructs', validator,
         '<div class="baz">something</div>');

     testHtml('blocks unknown attributes', validator,
         '<div foo="baz">something</div>', '<div>something</div>');

     testHtml('blocks custom element', validator,
         '<x-my-element>something</x-my-element>', '');

     testHtml('blocks custom is element', validator,
         '<div is="x-my-element">something</div>', '');

     testHtml(
         'blocks body elements', validator, '<body background="s"></body>', '');

     testHtml(
         'allows select elements',
         validator,
         '<select>'
         '<option>a</option>'
         '</select>');

     testHtml('blocks sequential script elements', validator,
         '<div><script></script><script></script></div>', '<div></div>');

     testHtml('blocks inline styles', validator,
         '<div style="background: red"></div>', '<div></div>');

     testHtml('blocks namespaced attributes', validator,
         '<div ns:foo="foo"></div>', '<div></div>');

     testHtml('blocks namespaced common attributes', validator,
         '<div ns:class="foo"></div>', '<div></div>');

     testHtml('blocks namespaced common elements', validator,
         '<ns:div></ns:div>', '');

     testHtml('allows CDATA sections', validator,
         '<span>![CDATA[ some text ]]></span>');

     testHtml('backquotes not removed', validator,
         '<img src="dice.png" alt="``onload=xss()" />');

     testHtml('0x3000 not removed', validator,
         '<a href="&#x3000;javascript:alert(1)">CLICKME</a>');

     test('sanitizes template contents', () {
       if (!TemplateElement.supported) return;

       var html = '<template>'
           '<div></div>'
           '<script></script>'
           '<img src="http://example.com/foo"/>'
           '</template>';

       var fragment = document.body.createFragment(html, validator: validator);
       var template = fragment.nodes.single as TemplateElement;

       var expectedContent = document.body.createFragment('<div></div>'
           '<img/>');

       validateNodeTree(template.content, expectedContent);
     });

     test("appendHtml is sanitized", () {
       var html = '<body background="s"></body><div></div>';
       document.body.appendHtml('<div id="stuff"></div>');
       var stuff = document.querySelector("#stuff");
       stuff.appendHtml(html);
       expect(stuff.childNodes.length, 1);
       stuff.remove();
     });

     test("documentFragment.appendHtml is sanitized", () {
       var html = '<div id="things></div>';
       var fragment = new DocumentFragment.html(html);
       fragment.appendHtml('<div id="bad"><script></script></div>');
       expect(fragment.childNodes.length, 1);
       var child = fragment.childNodes[0] as Element;
       expect(child.id, "bad");
       expect(child.childNodes.length, 0);
     });

     testHtml(
         "sanitizes embed",
         validator,
         "<div><embed src='' type='application/x-shockwave-flash'></embed></div>",
         "<div></div>");
   });

   group('URI_sanitization', () {
     var recorder = new RecordingUriValidator();
     var validator = new NodeValidatorBuilder()..allowHtml5(uriPolicy: recorder);

     checkUriPolicyCalls(String name, String html, String reference,
         List<String> expectedCalls) {
       test(name, () {
         recorder.reset();

         validateHtml(html, reference, validator);
         expect(recorder.calls, expectedCalls);
       });
     }

     checkUriPolicyCalls('a::href', '<a href="s"></a>', '<a></a>', ['s']);

     checkUriPolicyCalls(
         'area::href', '<area href="s"></area>', '<area></area>', ['s']);

     checkUriPolicyCalls(
         'blockquote::cite',
         '<blockquote cite="s"></blockquote>',
         '<blockquote></blockquote>',
         ['s']);
     checkUriPolicyCalls(
         'command::icon', '<command icon="s"/>', '<command/>', ['s']);
     checkUriPolicyCalls('img::src', '<img src="s"/>', '<img/>', ['s']);
     checkUriPolicyCalls('input::src', '<input src="s"/>', '<input/>', ['s']);
     checkUriPolicyCalls(
         'ins::cite', '<ins cite="s"></ins>', '<ins></ins>', ['s']);
     checkUriPolicyCalls('q::cite', '<q cite="s"></q>', '<q></q>', ['s']);
     checkUriPolicyCalls(
         'video::poster', '<video poster="s"/>', '<video/>', ['s']);
   });

   group('allowNavigation', () {
     var validator = new NodeValidatorBuilder()..allowNavigation();

     testHtml('allows anchor tags', validator, '<a href="#foo">foo</a>');

     testHtml('allows form elements', validator,
         '<form method="post" action="/foo"></form>');

     testHtml('disallows script navigation', validator,
         '<a href="javascript:foo = 1">foo</a>', '<a>foo</a>');

     testHtml('disallows cross-site navigation', validator,
         '<a href="http://example.com">example.com</a>', '<a>example.com</a>');

     testHtml('blocks other elements', validator,
         '<a href="#foo"><b>foo</b></a>', '<a href="#foo"></a>');

     testHtml('blocks tag extension', validator, '<a is="x-foo"></a>', '');
   });

   group('allowImages', () {
     var validator = new NodeValidatorBuilder()..allowImages();

     testHtml('allows images', validator,
         '<img src="/foo.jpg" alt="something" width="100" height="100"/>');

     testHtml('blocks onerror', validator,
         '<img src="/foo.jpg" onerror="something"/>', '<img src="/foo.jpg"/>');

     testHtml('enforces same-origin', validator,
         '<img src="http://example.com/foo.jpg"/>', '<img/>');
   });

   group('allowCustomElement', () {
     var validator = new NodeValidatorBuilder()
       ..allowCustomElement('x-foo', attributes: ['bar'], uriAttributes: ['baz'])
       ..allowHtml5();

     testHtml('allows custom elements', validator,
         '<x-foo bar="something" baz="/foo.jpg"></x-foo>');

     testHtml('validates custom tag URIs', validator,
         '<x-foo baz="http://example.com/foo.jpg"></x-foo>', '<x-foo></x-foo>');

     testHtml('blocks type extensions', validator, '<div is="x-foo"></div>', '');

     testHtml('blocks tags on non-matching elements', validator,
         '<div bar="foo"></div>', '<div></div>');
   });

   group('identify Uri attributes listed as attributes', () {
     var validator = new NodeValidatorBuilder()
       ..allowElement('a', attributes: ['href']);

     testHtml(
         'reject different-origin link',
         validator,
         '<a href="http://www.google.com/foo">Google-Foo</a>',
         '<a>Google-Foo</a>');
   });

   group('allowTagExtension', () {
     var validator = new NodeValidatorBuilder()
       ..allowTagExtension('x-foo', 'div',
           attributes: ['bar'], uriAttributes: ['baz'])
       ..allowHtml5();

     testHtml('allows tag extensions', validator,
         '<div is="x-foo" bar="something" baz="/foo.jpg"></div>');

     testHtml('blocks custom elements', validator, '<x-foo></x-foo>', '');

     testHtml(
         'validates tag extension URIs',
         validator,
         '<div is="x-foo" baz="http://example.com/foo.jpg"></div>',
         '<div is="x-foo"></div>');

     testHtml('blocks tags on non-matching elements', validator,
         '<div bar="foo"></div>', '<div></div>');

     testHtml('blocks non-matching tags', validator,
         '<span is="x-foo">something</span>', '');

     validator = new NodeValidatorBuilder()
       ..allowTagExtension('x-foo', 'div',
           attributes: ['bar'], uriAttributes: ['baz'])
       ..allowTagExtension('x-else', 'div');

     testHtml('blocks tags on non-matching custom elements', validator,
         '<div bar="foo" is="x-else"></div>', '<div is="x-else"></div>');
   });

   group('allowTemplating', () {
     var validator = new NodeValidatorBuilder()
       ..allowTemplating()
       ..allowHtml5();

     testHtml(
         'allows templates', validator, '<template bind="{{a}}"></template>');

     testHtml('allows template attributes', validator,
         '<template bind="{{a}}" ref="foo" repeat="{{}}" if="{{}}" syntax="foo"></template>');

     testHtml('allows template attribute', validator,
         '<div template repeat="{{}}"></div>');

     testHtml('blocks illegal template attribute', validator,
         '<div template="foo" repeat="{{}}"></div>', '<div></div>');
   });

   group('allowSvg', () {
     var validator = new NodeValidatorBuilder()
       ..allowSvg()
       ..allowTextElements();

     testHtml(
         'allows basic SVG',
         validator,
         '<svg xmlns="http://www.w3.org/2000/svg'
         'xmlns:xlink="http://www.w3.org/1999/xlink">'
         '<image xlink:href="foo" data-foo="bar"/>'
         '</svg>');

     testHtml(
         'blocks script elements',
         validator,
         '<svg xmlns="http://www.w3.org/2000/svg>'
         '<script></script>'
         '</svg>',
         '');

     testHtml(
         'blocks script elements but allows other',
         validator,
         '<svg xmlns="http://www.w3.org/2000/svg>'
         '<script></script><ellipse cx="200" cy="80" rx="100" ry="50"></ellipse>'
         '</svg>',
         '<svg xmlns="http://www.w3.org/2000/svg>'
         '<ellipse cx="200" cy="80" rx="100" ry="50"></ellipse>'
         '</svg>');

     testHtml(
         'blocks script handlers',
         validator,
         '<svg xmlns="http://www.w3.org/2000/svg'
         'xmlns:xlink="http://www.w3.org/1999/xlink">'
         '<image xlink:href="foo" onerror="something"/>'
         '</svg>',
         '<svg xmlns="http://www.w3.org/2000/svg'
         'xmlns:xlink="http://www.w3.org/1999/xlink">'
         '<image xlink:href="foo"/>'
         '</svg>');

     testHtml(
         'blocks foreignObject content',
         validator,
         '<svg xmlns="http://www.w3.org/2000/svg">'
         '<foreignobject width="100" height="150">'
         '<body xmlns="http://www.w3.org/1999/xhtml">'
         '<div>Some content</div>'
         '</body>'
         '</foreignobject>'
         '<b>42</b>'
         '</svg>',
         '<svg xmlns="http://www.w3.org/2000/svg">'
         '<b>42</b>'
         '</svg>');
   });

   group('allowInlineStyles', () {
     var validator = new NodeValidatorBuilder()
       ..allowTextElements()
       ..allowInlineStyles();

     testHtml('allows inline styles', validator,
         '<span style="background-color:red">text</span>');

     testHtml('blocks other attributes', validator,
         '<span class="red-span"></span>', '<span></span>');

     validator = new NodeValidatorBuilder()
       ..allowTextElements()
       ..allowInlineStyles(tagName: 'span');

     testHtml('scoped allows inline styles on spans', validator,
         '<span style="background-color:red">text</span>');

     testHtml('scoped blocks inline styles on LIs', validator,
         '<li style="background-color:red">text</li>', '<li>text</li>');
   });

   group('throws', () {
     var validator = new NodeValidator.throws(new NodeValidatorBuilder.common());

     var validationError = throwsArgumentError;

     test('does not throw on valid syntax', () {
       expect(() {
         document.body.createFragment('<div></div>', validator: validator);
       }, returnsNormally);
     });

     test('throws on invalid elements', () {
       expect(() {
         document.body.createFragment('<foo></foo>', validator: validator);
       }, validationError);
     });

     test('throws on invalid attributes', () {
       expect(() {
         document.body
             .createFragment('<div foo="bar"></div>', validator: validator);
       }, validationError);
     });

     test('throws on invalid attribute values', () {
       expect(() {
         document.body.createFragment('<img src="http://example.com/foo.jpg"/>',
             validator: validator);
       }, validationError);
     });
   });

   group('svg', () {
     test('parsing', () {
       var svgText = '<svg xmlns="http://www.w3.org/2000/svg'
           'xmlns:xlink="http://www.w3.org/1999/xlink">'
           '<image xlink:href="foo" data-foo="bar"/>'
           '</svg>';

       var fragment = new DocumentFragment.svg(svgText);
       var element = fragment.nodes.first as Element;
       expect(element is svg.SvgSvgElement, isTrue);
       expect(element.children[0] is svg.ImageElement, isTrue);
     });
   });

   group('dom_clobbering', () {
     var validator = new NodeValidatorBuilder.common();

     testHtml(
         'DOM clobbering of attributes with single node',
         validator,
         "<form id='single_node_clobbering' onmouseover='alert(1)'><input name='attributes'>",
         "");

     testHtml('DOM clobbering of previousSibling',
       validator,
       'https://example.com/<div><img/src="x"/onerror="alert();"/><form><input/name="previousSibling"></form></div>',
       'https://example.com/<div><img src="x"></div>'
     );

     // The lastChild and childNodes clobbering corrupts iterating the tree. They
     // get removed, but in the meantime the evil node has been skipped. Note
     // that we end up deleting the entire form because the clobbering makes its
     // lastChild incorrect and we detect this, but only on the second time
     // through.
     testHtml('DOM clobbering of both childNodes and lastChild',
       validator,
       "abc<form><div><img src='x' onerror='alert(document.domain)'></div><div><input name='childNodes'><input id='lastChild' name='childNodes'></div></form>",
       'abc'
     );

     test('DOM clobbering of previousSibling via append', () {
       var div = Element.div();
       var bad =
           'https://example.com/<div><img/src="x"/onerror="alert();"/><form><input/name="previousSibling"></form></div>';
       div.innerHtml = bad;
       expect(div.innerHtml, 'https://example.com/<div><img src="x"></div>');
     });

     testHtml(
         'DOM clobbering of attributes with multiple nodes',
         validator,
         "<form onmouseover='alert(1)'><input name='attributes'>"
         "<input name='attributes'>",
         "");

     testHtml('DOM clobbering of lastChild', validator,
         "<form><input name='lastChild'><input onmouseover='alert(1)'>", "");

     testHtml(
         'DOM clobbering of both children and lastChild',
         validator,
         "<form><input name='lastChild'><input name='children'>"
         "<input id='children'><input onmouseover='alert(1)'>",
         "");

     testHtml(
         'DOM clobbering of both children and lastChild, different order',
         validator,
         "<form><input name='children'><input name='children'>"
         "<input id='children' name='lastChild'>"
         "<input id='bad' onmouseover='alert(1)'>",
         "");

     // Walking templates triggers a recursive sanitization call, which shouldn't
     // invalidate the information collected from the previous visit of the later
     // nodes in the walk.
     testHtml(
         'DOM clobbering with recursive sanitize call using templates',
         validator,
         "<form><div>"
           "<input id=childNodes />"
           "<template></template>"
           "<input id=childNodes name=lastChild />"
           "<img id=exploitImg src=0 onerror='alert(1)' />"
           "</div></form>",
         "");

     test('tagName makes containing form invalid', () {
       var fragment = document.body.createFragment(
           "<form onmouseover='alert(2)'><input name='tagName'>",
           validator: validator);
       var form = fragment.lastChild as FormElement;
       // If the tagName was clobbered, the sanitizer should have removed
       // the whole thing and form is null.
       // If the tagName was not clobbered, then there will be content,
       // but the tagName should be the normal value. IE11 has started
       // doing this.
       if (form != null) {
         expect(form.tagName, 'FORM');
       }
     });

     test('tagName without mouseover', () {
       var fragment = document.body
           .createFragment("<form><input name='tagName'>", validator: validator);
       var form = fragment.lastChild as FormElement;
       // If the tagName was clobbered, the sanitizer should have removed
       // the whole thing and form is null.
       // If the tagName was not clobbered, then there will be content,
       // but the tagName should be the normal value.
       if (form != null) {
         expect(form.tagName, 'FORM');
       }
     });
   });
 }
	// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.

	// @dart = 2.9

	/// This tests HTML validation and sanitization, which is very important
	/// for prevent XSS or other attacks. If you suppress this, or parts of it
	/// please make it a critical bug and bring it to the attention of the
	/// dart:html maintainers.
	library node_validator_test;

	import 'dart:html';
	import 'dart:svg' as svg;

	import 'package:expect/minitest.dart';

	import 'utils.dart';

	void validateHtml(String html, String reference, NodeValidator validator) {
	var a = document.body.createFragment(html, validator: validator);
	var b = document.body
	.createFragment(reference, treeSanitizer: NodeTreeSanitizer.trusted);

	// Prevent a false pass when both the html and the reference both get entirely
	// deleted, which is technically a match, but unlikely to be what we meant.
	if (reference != '') {
	expect(b.childNodes.length > 0, isTrue);
	}
	validateNodeTree(a, b);
	}

	class RecordingUriValidator implements UriPolicy {
	final List<String> calls = <String>[];

	bool allowsUri(String uri) {
	calls.add('$uri');
	return false;
	}

	void reset() {
	calls.clear();
	}
	}

	void testHtml(String name, NodeValidator validator, String html,
	[String reference]) {
	test(name, () {
	if (reference == null) {
	reference = html;
	}

	validateHtml(html, reference, validator);
	});
	}

	main() {
	group('DOM_sanitization', () {
	var validator = new NodeValidatorBuilder.common();

	testHtml('allows simple constructs', validator,
	'<div class="baz">something</div>');

	testHtml('blocks unknown attributes', validator,
	'<div foo="baz">something</div>', '<div>something</div>');

	testHtml('blocks custom element', validator,
	'<x-my-element>something</x-my-element>', '');

	testHtml('blocks custom is element', validator,
	'<div is="x-my-element">something</div>', '');

	testHtml(
	'blocks body elements', validator, '<body background="s"></body>', '');

	testHtml(
	'allows select elements',
	validator,
	'<select>'
	'<option>a</option>'
	'</select>');

	testHtml('blocks sequential script elements', validator,
	'<div><script></script><script></script></div>', '<div></div>');

	testHtml('blocks inline styles', validator,
	'<div style="background: red"></div>', '<div></div>');

	testHtml('blocks namespaced attributes', validator,
	'<div ns:foo="foo"></div>', '<div></div>');

	testHtml('blocks namespaced common attributes', validator,
	'<div ns:class="foo"></div>', '<div></div>');

	testHtml('blocks namespaced common elements', validator,
	'<ns:div></ns:div>', '');

	testHtml('allows CDATA sections', validator,
	'<span>![CDATA[ some text ]]></span>');

	testHtml('backquotes not removed', validator,
	'<img src="dice.png" alt="``onload=xss()" />');

	testHtml('0x3000 not removed', validator,
	'<a href="　javascript:alert(1)">CLICKME</a>');

	test('sanitizes template contents', () {
	if (!TemplateElement.supported) return;

	var html = '<template>'
	'<div></div>'
	'<script></script>'
	'<img src="http://example.com/foo"/>'
	'</template>';

	var fragment = document.body.createFragment(html, validator: validator);
	var template = fragment.nodes.single as TemplateElement;

	var expectedContent = document.body.createFragment('<div></div>'
	'<img/>');

	validateNodeTree(template.content, expectedContent);
	});

	test("appendHtml is sanitized", () {
	var html = '<body background="s"></body><div></div>';
	document.body.appendHtml('<div id="stuff"></div>');
	var stuff = document.querySelector("#stuff");
	stuff.appendHtml(html);
	expect(stuff.childNodes.length, 1);
	stuff.remove();
	});

	test("documentFragment.appendHtml is sanitized", () {
	var html = '<div id="things></div>';
	var fragment = new DocumentFragment.html(html);
	fragment.appendHtml('<div id="bad"><script></script></div>');
	expect(fragment.childNodes.length, 1);
	var child = fragment.childNodes[0] as Element;
	expect(child.id, "bad");
	expect(child.childNodes.length, 0);
	});

	testHtml(
	"sanitizes embed",
	validator,
	"<div><embed src='' type='application/x-shockwave-flash'></embed></div>",
	"<div></div>");
	});

	group('URI_sanitization', () {
	var recorder = new RecordingUriValidator();
	var validator = new NodeValidatorBuilder()..allowHtml5(uriPolicy: recorder);

	checkUriPolicyCalls(String name, String html, String reference,
	List<String> expectedCalls) {
	test(name, () {
	recorder.reset();

	validateHtml(html, reference, validator);
	expect(recorder.calls, expectedCalls);
	});
	}

	checkUriPolicyCalls('a::href', '<a href="s"></a>', '<a></a>', ['s']);

	checkUriPolicyCalls(
	'area::href', '<area href="s"></area>', '<area></area>', ['s']);

	checkUriPolicyCalls(
	'blockquote::cite',
	'<blockquote cite="s"></blockquote>',
	'<blockquote></blockquote>',
	['s']);
	checkUriPolicyCalls(
	'command::icon', '<command icon="s"/>', '<command/>', ['s']);
	checkUriPolicyCalls('img::src', '<img src="s"/>', '<img/>', ['s']);
	checkUriPolicyCalls('input::src', '<input src="s"/>', '<input/>', ['s']);
	checkUriPolicyCalls(
	'ins::cite', '<ins cite="s"></ins>', '<ins></ins>', ['s']);
	checkUriPolicyCalls('q::cite', '<q cite="s"></q>', '<q></q>', ['s']);
	checkUriPolicyCalls(
	'video::poster', '<video poster="s"/>', '<video/>', ['s']);
	});

	group('allowNavigation', () {
	var validator = new NodeValidatorBuilder()..allowNavigation();

	testHtml('allows anchor tags', validator, '<a href="#foo">foo</a>');

	testHtml('allows form elements', validator,
	'<form method="post" action="/foo"></form>');

	testHtml('disallows script navigation', validator,
	'<a href="javascript:foo = 1">foo</a>', '<a>foo</a>');

	testHtml('disallows cross-site navigation', validator,
	'<a href="http://example.com">example.com</a>', '<a>example.com</a>');

	testHtml('blocks other elements', validator,
	'<a href="#foo"><b>foo</b></a>', '<a href="#foo"></a>');

	testHtml('blocks tag extension', validator, '<a is="x-foo"></a>', '');
	});

	group('allowImages', () {
	var validator = new NodeValidatorBuilder()..allowImages();

	testHtml('allows images', validator,
	'<img src="/foo.jpg" alt="something" width="100" height="100"/>');

	testHtml('blocks onerror', validator,
	'<img src="/foo.jpg" onerror="something"/>', '<img src="/foo.jpg"/>');

	testHtml('enforces same-origin', validator,
	'<img src="http://example.com/foo.jpg"/>', '<img/>');
	});

	group('allowCustomElement', () {
	var validator = new NodeValidatorBuilder()
	..allowCustomElement('x-foo', attributes: ['bar'], uriAttributes: ['baz'])
	..allowHtml5();

	testHtml('allows custom elements', validator,
	'<x-foo bar="something" baz="/foo.jpg"></x-foo>');

	testHtml('validates custom tag URIs', validator,
	'<x-foo baz="http://example.com/foo.jpg"></x-foo>', '<x-foo></x-foo>');

	testHtml('blocks type extensions', validator, '<div is="x-foo"></div>', '');

	testHtml('blocks tags on non-matching elements', validator,
	'<div bar="foo"></div>', '<div></div>');
	});

	group('identify Uri attributes listed as attributes', () {
	var validator = new NodeValidatorBuilder()
	..allowElement('a', attributes: ['href']);

	testHtml(
	'reject different-origin link',
	validator,
	'<a href="http://www.google.com/foo">Google-Foo</a>',
	'<a>Google-Foo</a>');
	});

	group('allowTagExtension', () {
	var validator = new NodeValidatorBuilder()
	..allowTagExtension('x-foo', 'div',
	attributes: ['bar'], uriAttributes: ['baz'])
	..allowHtml5();

	testHtml('allows tag extensions', validator,
	'<div is="x-foo" bar="something" baz="/foo.jpg"></div>');

	testHtml('blocks custom elements', validator, '<x-foo></x-foo>', '');

	testHtml(
	'validates tag extension URIs',
	validator,
	'<div is="x-foo" baz="http://example.com/foo.jpg"></div>',
	'<div is="x-foo"></div>');

	testHtml('blocks tags on non-matching elements', validator,
	'<div bar="foo"></div>', '<div></div>');

	testHtml('blocks non-matching tags', validator,
	'<span is="x-foo">something</span>', '');

	validator = new NodeValidatorBuilder()
	..allowTagExtension('x-foo', 'div',
	attributes: ['bar'], uriAttributes: ['baz'])
	..allowTagExtension('x-else', 'div');

	testHtml('blocks tags on non-matching custom elements', validator,
	'<div bar="foo" is="x-else"></div>', '<div is="x-else"></div>');
	});

	group('allowTemplating', () {
	var validator = new NodeValidatorBuilder()
	..allowTemplating()
	..allowHtml5();

	testHtml(
	'allows templates', validator, '<template bind="{{a}}"></template>');

	testHtml('allows template attributes', validator,
	'<template bind="{{a}}" ref="foo" repeat="{{}}" if="{{}}" syntax="foo"></template>');

	testHtml('allows template attribute', validator,
	'<div template repeat="{{}}"></div>');

	testHtml('blocks illegal template attribute', validator,
	'<div template="foo" repeat="{{}}"></div>', '<div></div>');
	});

	group('allowSvg', () {
	var validator = new NodeValidatorBuilder()
	..allowSvg()
	..allowTextElements();

	testHtml(
	'allows basic SVG',
	validator,
	'<svg xmlns="http://www.w3.org/2000/svg'
	'xmlns:xlink="http://www.w3.org/1999/xlink">'
	'<image xlink:href="foo" data-foo="bar"/>'
	'</svg>');

	testHtml(
	'blocks script elements',
	validator,
	'<svg xmlns="http://www.w3.org/2000/svg>'
	'<script></script>'
	'</svg>',
	'');

	testHtml(
	'blocks script elements but allows other',
	validator,
	'<svg xmlns="http://www.w3.org/2000/svg>'
	'<script></script><ellipse cx="200" cy="80" rx="100" ry="50"></ellipse>'
	'</svg>',
	'<svg xmlns="http://www.w3.org/2000/svg>'
	'<ellipse cx="200" cy="80" rx="100" ry="50"></ellipse>'
	'</svg>');

	testHtml(
	'blocks script handlers',
	validator,
	'<svg xmlns="http://www.w3.org/2000/svg'
	'xmlns:xlink="http://www.w3.org/1999/xlink">'
	'<image xlink:href="foo" onerror="something"/>'
	'</svg>',
	'<svg xmlns="http://www.w3.org/2000/svg'
	'xmlns:xlink="http://www.w3.org/1999/xlink">'
	'<image xlink:href="foo"/>'
	'</svg>');

	testHtml(
	'blocks foreignObject content',
	validator,
	'<svg xmlns="http://www.w3.org/2000/svg">'
	'<foreignobject width="100" height="150">'
	'<body xmlns="http://www.w3.org/1999/xhtml">'
	'<div>Some content</div>'
	'</body>'
	'</foreignobject>'
	'<b>42</b>'
	'</svg>',
	'<svg xmlns="http://www.w3.org/2000/svg">'
	'<b>42</b>'
	'</svg>');
	});

	group('allowInlineStyles', () {
	var validator = new NodeValidatorBuilder()
	..allowTextElements()
	..allowInlineStyles();

	testHtml('allows inline styles', validator,
	'<span style="background-color:red">text</span>');

	testHtml('blocks other attributes', validator,
	'<span class="red-span"></span>', '<span></span>');

	validator = new NodeValidatorBuilder()
	..allowTextElements()
	..allowInlineStyles(tagName: 'span');

	testHtml('scoped allows inline styles on spans', validator,
	'<span style="background-color:red">text</span>');

	testHtml('scoped blocks inline styles on LIs', validator,
	'<li style="background-color:red">text</li>', '<li>text</li>');
	});

	group('throws', () {
	var validator = new NodeValidator.throws(new NodeValidatorBuilder.common());

	var validationError = throwsArgumentError;

	test('does not throw on valid syntax', () {
	expect(() {
	document.body.createFragment('<div></div>', validator: validator);
	}, returnsNormally);
	});

	test('throws on invalid elements', () {
	expect(() {
	document.body.createFragment('<foo></foo>', validator: validator);
	}, validationError);
	});

	test('throws on invalid attributes', () {
	expect(() {
	document.body
	.createFragment('<div foo="bar"></div>', validator: validator);
	}, validationError);
	});

	test('throws on invalid attribute values', () {
	expect(() {
	document.body.createFragment('<img src="http://example.com/foo.jpg"/>',
	validator: validator);
	}, validationError);
	});
	});

	group('svg', () {
	test('parsing', () {
	var svgText = '<svg xmlns="http://www.w3.org/2000/svg'
	'xmlns:xlink="http://www.w3.org/1999/xlink">'
	'<image xlink:href="foo" data-foo="bar"/>'
	'</svg>';

	var fragment = new DocumentFragment.svg(svgText);
	var element = fragment.nodes.first as Element;
	expect(element is svg.SvgSvgElement, isTrue);
	expect(element.children[0] is svg.ImageElement, isTrue);
	});
	});

	group('dom_clobbering', () {
	var validator = new NodeValidatorBuilder.common();

	testHtml(
	'DOM clobbering of attributes with single node',
	validator,
	"<form id='single_node_clobbering' onmouseover='alert(1)'><input name='attributes'>",
	"");

	testHtml('DOM clobbering of previousSibling',
	validator,
	'https://example.com/<div><img/src="x"/onerror="alert();"/><form><input/name="previousSibling"></form></div>',
	'https://example.com/<div><img src="x"></div>'
	);

	// The lastChild and childNodes clobbering corrupts iterating the tree. They
	// get removed, but in the meantime the evil node has been skipped. Note
	// that we end up deleting the entire form because the clobbering makes its
	// lastChild incorrect and we detect this, but only on the second time
	// through.
	testHtml('DOM clobbering of both childNodes and lastChild',
	validator,
	"abc<form><div><img src='x' onerror='alert(document.domain)'></div><div><input name='childNodes'><input id='lastChild' name='childNodes'></div></form>",
	'abc'
	);

	test('DOM clobbering of previousSibling via append', () {
	var div = Element.div();
	var bad =
	'https://example.com/<div><img/src="x"/onerror="alert();"/><form><input/name="previousSibling"></form></div>';
	div.innerHtml = bad;
	expect(div.innerHtml, 'https://example.com/<div><img src="x"></div>');
	});

	testHtml(
	'DOM clobbering of attributes with multiple nodes',
	validator,
	"<form onmouseover='alert(1)'><input name='attributes'>"
	"<input name='attributes'>",
	"");

	testHtml('DOM clobbering of lastChild', validator,
	"<form><input name='lastChild'><input onmouseover='alert(1)'>", "");

	testHtml(
	'DOM clobbering of both children and lastChild',
	validator,
	"<form><input name='lastChild'><input name='children'>"
	"<input id='children'><input onmouseover='alert(1)'>",
	"");

	testHtml(
	'DOM clobbering of both children and lastChild, different order',
	validator,
	"<form><input name='children'><input name='children'>"
	"<input id='children' name='lastChild'>"
	"<input id='bad' onmouseover='alert(1)'>",
	"");

	// Walking templates triggers a recursive sanitization call, which shouldn't
	// invalidate the information collected from the previous visit of the later
	// nodes in the walk.
	testHtml(
	'DOM clobbering with recursive sanitize call using templates',
	validator,
	"<form><div>"
	"<input id=childNodes />"
	"<template></template>"
	"<input id=childNodes name=lastChild />"
	"<img id=exploitImg src=0 onerror='alert(1)' />"
	"</div></form>",
	"");

	test('tagName makes containing form invalid', () {
	var fragment = document.body.createFragment(
	"<form onmouseover='alert(2)'><input name='tagName'>",
	validator: validator);
	var form = fragment.lastChild as FormElement;
	// If the tagName was clobbered, the sanitizer should have removed
	// the whole thing and form is null.
	// If the tagName was not clobbered, then there will be content,
	// but the tagName should be the normal value. IE11 has started
	// doing this.
	if (form != null) {
	expect(form.tagName, 'FORM');
	}
	});

	test('tagName without mouseover', () {
	var fragment = document.body
	.createFragment("<form><input name='tagName'>", validator: validator);
	var form = fragment.lastChild as FormElement;
	// If the tagName was clobbered, the sanitizer should have removed
	// the whole thing and form is null.
	// If the tagName was not clobbered, then there will be content,
	// but the tagName should be the normal value.
	if (form != null) {
	expect(form.tagName, 'FORM');
	}
	});
	});
	}