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HtmlPolicyBuilderTest.java
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// Copyright (c) 2011, Mike Samuel
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// Neither the name of the OWASP nor the names of its contributors may
// be used to endorse or promote products derived from this software
// without specific prior written permission.
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package org.owasp.html;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import org.junit.Test;
import junit.framework.TestCase;
@SuppressWarnings("javadoc")
public class HtmlPolicyBuilderTest extends TestCase {
static final String EXAMPLE = Arrays.stream(new String[] {
"<h1 id='foo'>Header</h1>",
"<p onclick='alert(42)'>Paragraph 1<script>evil()</script></p>",
("<p><a href='java\0script:bad()'>Click</a> <a href='foo.html'>me</a>"
+ " <a href='http://outside.org/'>out</a></p>"),
("<p><img src=canary.png alt=local-canary>" +
"<img src='http://canaries.org/canary.png'></p>"),
"<p><b style=font-size:bigger>Fancy</b> with <i><b>soupy</i> tags</b>.",
"<p style='color: expression(foo()); text-align: center;",
" /* direction: ltr */; font-weight: bold'>Stylish Para 1</p>",
"<p style='color: red; font-weight; expression(foo());",
" direction: rtl; font-weight: bold'>Stylish Para 2</p>",
""}).collect(Collectors.joining("\n"));
@Test
public static final void testTextFilter() {
assertEquals(
Arrays.stream(new String[] {
"Header",
"Paragraph 1",
"Click me out",
"",
"Fancy with soupy tags.",
"Stylish Para 1",
"Stylish Para 2",
""}).collect(Collectors.joining("\n")),
apply(new HtmlPolicyBuilder()));
}
@Test
public static final void testCannedFormattingTagFilter() {
assertEquals(
Arrays.stream(new String[] {
"Header",
"Paragraph 1",
"Click me out",
"",
"<b>Fancy</b> with <i><b>soupy</b></i><b> tags</b>.",
"Stylish Para 1",
"Stylish Para 2",
""}).collect(Collectors.joining("\n")),
apply(new HtmlPolicyBuilder()
.allowCommonInlineFormattingElements()));
}
@Test
public static final void testCannedFormattingTagFilterNoItalics() {
assertEquals(
Arrays.stream(new String[] {
"Header",
"Paragraph 1",
"Click me out",
"",
"<b>Fancy</b> with <b>soupy</b><b> tags</b>.",
"Stylish Para 1",
"Stylish Para 2",
""}).collect(Collectors.joining("\n")),
apply(new HtmlPolicyBuilder()
.allowCommonInlineFormattingElements()
.disallowElements("I")));
}
@Test
public static final void testSimpleTagFilter() {
assertEquals(
Arrays.stream(new String[] {
"<h1>Header</h1>",
"Paragraph 1",
"Click me out",
"",
"Fancy with <i>soupy</i> tags.",
"Stylish Para 1",
"Stylish Para 2",
""}).collect(Collectors.joining("\n")),
apply(new HtmlPolicyBuilder()
.allowElements("h1", "i")));
}
@Test
public static final void testLinksAllowed() {
assertEquals(
Arrays.stream(new String[] {
"Header",
"Paragraph 1",
// We haven't allowed any protocols so only relative URLs are OK.
"Click <a href=\"foo.html\">me</a> out",
"",
"Fancy with soupy tags.",
"Stylish Para 1",
"Stylish Para 2",
""}).collect(Collectors.joining("\n")),
apply(new HtmlPolicyBuilder()
.allowElements("a")
.allowAttributes("href").onElements("a")));
}
@Test
public static final void testExternalLinksAllowed() {
assertEquals(
Arrays.stream(new String[] {
"Header",
"Paragraph 1",
"Click <a href=\"foo.html\">me</a>"
+ " <a href=\"http://outside.org/\">out</a>",
"",
"Fancy with soupy tags.",
"Stylish Para 1",
"Stylish Para 2",
""}).collect(Collectors.joining("\n")),
apply(new HtmlPolicyBuilder()
.allowElements("a")
// Allows http.
.allowStandardUrlProtocols()
.allowAttributes("href").onElements("a")));
}
@Test
public static final void testLinksWithNofollow() {
assertEquals(
Arrays.stream(new String[] {
"Header",
"Paragraph 1",
"Click <a href=\"foo.html\" rel=\"nofollow\">me</a> out",
"",
"Fancy with soupy tags.",
"Stylish Para 1",
"Stylish Para 2",
""}).collect(Collectors.joining("\n")),
apply(new HtmlPolicyBuilder()
.allowElements("a")
// Allows http.
.allowAttributes("href").onElements("a")
.requireRelNofollowOnLinks()));
}
@Test
public static final void testLinksWithNofollowAlreadyPresent() {
assertEquals(
"html <a href=\"/\" rel=\"nofollow\">link</a>",
apply(
new HtmlPolicyBuilder()
.allowElements("a")
.allowAttributes("href").onElements("a")
.requireRelNofollowOnLinks(),
"html <a href='/' rel='nofollow'>link</a>"));
}
@Test
public static final void testImagesAllowed() {
assertEquals(
Arrays.stream(new String[] {
"Header",
"Paragraph 1",
"Click me out",
"<img src=\"canary.png\" alt=\"local-canary\" />",
// HTTP img not output because only HTTPS allowed.
"Fancy with soupy tags.",
"Stylish Para 1",
"Stylish Para 2",
""}).collect(Collectors.joining("\n")),
apply(new HtmlPolicyBuilder()
.allowElements("img")
.allowAttributes("src", "alt").onElements("img")
.allowUrlProtocols("https")));
}
@Test
public static final void testStyleFiltering() {
assertEquals(
Arrays.stream(new String[] {
"<h1>Header</h1>",
"<p>Paragraph 1</p>",
"<p>Click me out</p>",
"<p></p>",
"<p><b>Fancy</b> with <i><b>soupy</b></i><b> tags</b>.",
("</p><p style=\"text-align:center;font-weight:bold\">"
+ "Stylish Para 1</p>"),
("<p style=\"color:red;direction:rtl;font-weight:bold\">"
+ "Stylish Para 2</p>"),
""}).collect(Collectors.joining("\n")),
apply(new HtmlPolicyBuilder()
.allowCommonInlineFormattingElements()
.allowCommonBlockElements()
.allowStyling()
.allowStandardUrlProtocols()));
}
@Test
public static final void testElementTransforming() {
assertEquals(
Arrays.stream(new String[] {
"<div class=\"header-h1\">Header</div>",
"<p>Paragraph 1</p>",
"<p>Click me out</p>",
"<p></p>",
"<p>Fancy with soupy tags.",
"</p><p>Stylish Para 1</p>",
"<p>Stylish Para 2</p>",
""}).collect(Collectors.joining("\n")),
apply(new HtmlPolicyBuilder()
.allowElements("h1", "p", "div")
.allowElements(
new ElementPolicy() {
public String apply(
String elementName, List<String> attrs) {
attrs.add("class");
attrs.add("header-" + elementName);
return "div";
}
}, "h1")));
}
@Test
public static final void testBodyTransforming() {
assertEquals(
"<div>foo</div>",
apply(
new HtmlPolicyBuilder()
.allowElements(
new ElementPolicy() {
public String apply(String elementName, List<String> attrs) {
return "div";
}
},
"body")
.allowElements("div"),
"<body>foo</body>"));
}
@Test
public static final void testAllowUrlProtocols() {
assertEquals(
Arrays.stream(new String[] {
"Header",
"Paragraph 1",
"Click me out",
"<img src=\"canary.png\" alt=\"local-canary\" />"
+ "<img src=\"http://canaries.org/canary.png\" />",
"Fancy with soupy tags.",
"Stylish Para 1",
"Stylish Para 2",
""}).collect(Collectors.joining("\n")),
apply(new HtmlPolicyBuilder()
.allowElements("img")
.allowAttributes("src", "alt").onElements("img")
.allowUrlProtocols("http")));
}
@Test
public static final void testPossibleFalloutFromIssue5() {
assertEquals(
"Bad",
apply(
new HtmlPolicyBuilder()
.allowElements("a")
.allowAttributes("href").onElements("a")
.allowUrlProtocols("http"),
"<a href='javascript:alert(1337)//:http'>Bad</a>"));
}
@Test
public static final void testTextInOption() {
assertEquals(
"<select><option>1</option><option>2</option></select>",
apply(
new HtmlPolicyBuilder()
.allowElements("select", "option"),
"<select>\n <option>1</option>\n <option>2</option>\n</select>"));
}
@Test
public static final void testEntities() {
assertEquals(
"(Foo)\u00a0(Bar)\u2666\u2666\u2666\u2666(Baz)"
+ "𔠴𔠴𔠴(Boo)",
apply(
new HtmlPolicyBuilder(),
"(Foo) (Bar)♦♦♦♦(Baz)"
+ "\ud812\udc34𔠴𔠴(Boo)"));
}
@Test
public static final void testImageTag() {
assertEquals(
""
+ "<img src=\"http://example.com/foo.png\" />"
+ "<img src=\"http://example.com/bar.png\" />"
+ "<img />", // OK if this isn't here too.
apply(
new HtmlPolicyBuilder()
.allowElements("img")
.allowElements(
new ElementPolicy() {
public String apply(String elementName, List<String> attrs) {
return "img";
}
}, "image")
.allowAttributes("src").onElements("img", "image")
.allowStandardUrlProtocols(),
""
+ "<image src=\"http://example.com/foo.png\" />"
+ "<Image src=\"http://example.com/bar.png\">"
+ "<IMAGE>"));
}
@Test
public static final void testImgSrcsetSyntax() {
assertEquals(
""
+ "<img srcset=\"http://example.com/foo.png\" />\n"
+ "<img srcset=\"http://example.com/foo.png 640w\" />\n"
+ "<img srcset=\"http://example.com/foo.png 48x\" />\n"
+ "<img srcset=\"http://example.com/foo.png .123x\" />\n"
+ "<img srcset=\"http://example.com/foo.png .123e2x\" />\n"
+ "<img srcset=\"http://example.com/foo.png 123.456E-1x\" />\n"
+ "<img srcset=\"http://example.com/foo.png -123x\" />\n"
+ "no float: \n"
+ "no fraction: \n"
+ "no exponent: \n"
+ "<img srcset=\"/big.png 64w , /little.png\" />\n"
+ "<img srcset=\"/big.png 64w , /little.png\" />\n"
+ "<img srcset=\"/big.png 64w , /little.png\" />\n"
+ "<img srcset=\"foo%2cbar.png\" />\n"
+ "empty: \n"
+ "only space: \n"
+ "only comma: \n"
+ "comma at end: <img srcset=\"foo.png\" />\n"
+ "comma stuck to url: \n"
+ "commas inside: <img srcset=\"foo.png%2c%2cbar.png\" />\n"
+ "double commas 1: \n"
+ "double commas 2: \n"
+ "bad url: <img srcset=\"foo.png 1w\" />\n",
apply(
new HtmlPolicyBuilder()
.allowElements("img")
.allowAttributes("srcset").onElements("img")
.allowStandardUrlProtocols(),
""
+ "<img srcset=\"http://example.com/foo.png\" />\n"
+ "<img srcset=\"http://example.com/foo.png 640w\" />\n"
+ "<img srcset=\"http://example.com/foo.png 48x\" />\n"
+ "<img srcset=\"http://example.com/foo.png .123x\" />\n"
+ "<img srcset=\"http://example.com/foo.png .123e2x\" />\n"
+ "<img srcset=\"http://example.com/foo.png 123.456E-1x\" />\n"
+ "<img srcset=\"http://example.com/foo.png -123x\" />\n"
+ "no float: <img srcset=\"http://example.com/foo.png -x\" />\n"
+ "no fraction: <img srcset=\"http://example.com/foo.png -.e1\" />\n"
+ "no exponent: <img srcset=\"http://example.com/foo.png -1e+x\" />\n"
+ "<img srcset=\"/big.png 64w, /little.png\" />\n"
+ "<img srcset=\" /big.png 64w , /little.png\" />\n"
+ "<img srcset=\"\t\t/big.png 64w\r\n,/little.png\t\t\" />\n"
+ "<img srcset=\"foo,bar.png\" />\n"
+ "empty: <img srcset=\"\" />\n"
+ "only space: <img srcset=\" \" />\n"
+ "only comma: <img srcset=\",\" />\n"
+ "comma at end: <img srcset=\"foo.png ,\" />\n" // ok
+ "comma stuck to url: <img srcset=\"bar.png,\" />\n" // not ok
+ "commas inside: <img srcset=\"foo.png,,bar.png\" />\n" // escaped
+ "double commas 1: <img srcset=\"a ,, b\" />\n" // not ok
+ "double commas 2: <img srcset=\"a , , b\" />\n" // not ok
+ "bad url: <img srcset=\"foo.png 1w, javascript:evil()\" />\n"
));
}
@Test
public static final void testUrlChecksLayer() {
assertEquals(
""
+ "<img src=\"http://example.com/OK.png\" />\n"
+ "\n"
+ "<img srcset=\"http://example.com/bar.png#OK 1w\" />",
apply(
new HtmlPolicyBuilder()
.allowElements("img")
.allowAttributes("src", "srcset")
.matching(Pattern.compile(".*OK.*"))
.onElements("img")
.allowStandardUrlProtocols(),
""
+ "<img src=\"http://example.com/OK.png\" />\n"
+ "<img src=\"http://example.com/\" />\n"
+ "<img srcset=\"http://example.com/bar.png#OK 1w, javascript:alert%28%27OK%27%29\">"
)
);
}
@Test
public static final void testDuplicateAttributesDoNotReachElementPolicy() {
final int[] idCount = new int[1];
assertEquals(
// The id that is emitted is the first that passes the attribute
// starts-with-b filter.
// The attribute policy sees 3 id elements, hence id-count=3.
// The element policy sees 2 attributes, one "id" and one "href",
// hence attr-count=2.
"<a href=\"foo\" id=\"bar\" attr-count=\"2\" id-count=\"3\">link</a>",
apply(
new HtmlPolicyBuilder()
.allowElements(
new ElementPolicy() {
public String apply(String elementName, List<String> attrs) {
int nAttrs = attrs.size() / 2;
attrs.add("attr-count");
attrs.add("" + nAttrs);
attrs.add("id-count");
attrs.add("" + idCount[0]);
return elementName;
}
},
"a"
)
.allowAttributes("id").matching(new AttributePolicy() {
public String apply(
String elementName, String attributeName, String value) {
++idCount[0];
return value.startsWith("b") ? value : null;
}
}).onElements("a")
.allowAttributes("href").onElements("a"),
"<a href=\"foo\" id='far' id=\"bar\" href=baz id=boo>link</a>")
);
}
@Test
public static final void testPreprocessors() {
String input =
"<h1 title='foo'>one</h1> <h2>Two!</h2> <h3>three</h3>"
+ " <h4>Four</h4> <h5>5</h5> <h6>seis</h6>";
// We upper-case all text nodes and increment all header elements.
// Since h7 is not white-listed, the incremented version of <h6> is dropped.
// The title attribute value is not upper-cased.
String expected =
"<h2 title=\"foo\">ONE</h2> <h3>TWO!</h3> <h4>THREE</h4>"
+ " <h5>FOUR</h5> <h6>5</h6> SEIS";
assertEquals(
expected,
apply(
new HtmlPolicyBuilder()
.allowElements("h1", "h2", "h3", "h4", "h5", "h6")
.allowAttributes("title").globally()
.withPreprocessor(new HtmlStreamEventProcessor() {
public HtmlStreamEventReceiver wrap(HtmlStreamEventReceiver r) {
return new HtmlStreamEventReceiverWrapper(r) {
@Override
public void text(String s) {
underlying.text(s.toUpperCase(Locale.ROOT));
}
@Override
public String toString() {
return "shouty-text";
}
};
}
})
.withPreprocessor(new HtmlStreamEventProcessor() {
public HtmlStreamEventReceiver wrap(HtmlStreamEventReceiver r) {
return new HtmlStreamEventReceiverWrapper(r) {
@Override
public void openTag(String elementName, List<String> attrs) {
underlying.openTag(incr(elementName), attrs);
}
@Override
public void closeTag(String elementName) {
underlying.closeTag(incr(elementName));
}
String incr(String en) {
if (en.length() == 2) {
char c0 = en.charAt(0);
char c1 = en.charAt(1);
if ((c0 == 'h' || c0 == 'H')
&& '0' <= c1 && c1 <= '6') {
// h1 -> h2, h2 -> h3, etc.
return "h" + (c1 - '0' + 1);
}
}
return en;
}
@Override
public String toString() {
return "incr-headers";
}
};
}
}),
input));
}
@Test
public static final void testPostprocessors() {
String input =
"<h1 title='foo'>one</h1> <h2>TWO!</h2> <h3>three</h3>"
+ " <h4>Four</h4> <h5>5</h5> <h6>seis</h6>";
// We upper-case the first letter of each text nodes and increment all
// header elements.
// Since post-processors run after the policy, they can insert elements like
// <h7> which are not white-listed.
String expected =
"<h2 title=\"foo\">One</h2> <h3>TWO!</h3> <h4>Three</h4>"
+ " <h5>Four</h5> <h6>5</h6> <h7>Seis</h7>";
assertEquals(
expected,
apply(
new HtmlPolicyBuilder()
.allowElements("h1", "h2", "h3", "h4", "h5", "h6")
.allowAttributes("title").globally()
.withPostprocessor(new HtmlStreamEventProcessor() {
public HtmlStreamEventReceiver wrap(HtmlStreamEventReceiver r) {
return new HtmlStreamEventReceiverWrapper(r) {
@Override
public void text(String s) {
if (!s.isEmpty()) {
int cp0 = s.codePointAt(0);
underlying.text(
new StringBuilder(s.length())
.appendCodePoint(Character.toUpperCase(cp0))
.append(s, Character.charCount(cp0), s.length())
.toString());
}
}
@Override
public String toString() {
return "shouty-text";
}
};
}
})
.withPostprocessor(new HtmlStreamEventProcessor() {
public HtmlStreamEventReceiver wrap(HtmlStreamEventReceiver r) {
return new HtmlStreamEventReceiverWrapper(r) {
@Override
public void openTag(String elementName, List<String> attrs) {
underlying.openTag(incr(elementName), attrs);
}
@Override
public void closeTag(String elementName) {
underlying.closeTag(incr(elementName));
}
String incr(String en) {
if (en.length() == 2) {
char c0 = en.charAt(0);
char c1 = en.charAt(1);
if ((c0 == 'h' || c0 == 'H')
&& '0' <= c1 && c1 <= '6') {
// h1 -> h2, h2 -> h3, etc.
return "h" + (c1 - '0' + 1);
}
}
return en;
}
@Override
public String toString() {
return "incr-headers";
}
};
}
}),
input));
}
@Test
public static final void testBackgroundImageWithUrl() {
PolicyFactory policy = new HtmlPolicyBuilder()
.allowStandardUrlProtocols()
.allowStyling()
.allowUrlsInStyles(AttributePolicy.IDENTITY_ATTRIBUTE_POLICY)
.allowElements("div")
.toFactory();
String unsafeHtml = policy.sanitize(
"<html><head><title>test</title></head><body>" +
"<div style='"
+ "color: red; background-image: "
+ "url(http://example.com/foo.png)" +
"'>div content" +
"</div></body></html>");
String safeHtml = policy.sanitize(unsafeHtml);
String expected =
"<div style=\""
+ "color:red;background-image:"
+ "url('http://example.com/foo.png')"
+ "\">div content</div>";
assertEquals(expected, safeHtml);
}
@Test
public static final void testBackgroundImageWithImageFunction() {
PolicyFactory policy = new HtmlPolicyBuilder()
.allowStandardUrlProtocols()
.allowStyling()
.allowUrlsInStyles(AttributePolicy.IDENTITY_ATTRIBUTE_POLICY)
.allowElements("div")
.toFactory();
String unsafeHtml = policy.sanitize(
"<html><head><title>test</title></head><body>" +
"<div style='" +
"color: red; background-image: " +
"image(\"blue sky.png\", blue)'>" +
"div content" +
"</div></body></html>");
String safeHtml = policy.sanitize(unsafeHtml);
String expected =
"<div style=\""
+ "color:red;background-image:"
+ "image( url('blue%20sky.png') , blue )"
+ "\">div content</div>";
assertEquals(expected, safeHtml);
}
@Test
public static final void testBackgroundWithUrls() {
HtmlPolicyBuilder builder = new HtmlPolicyBuilder()
.allowStandardUrlProtocols()
.allowStyling()
.allowElements("div");
PolicyFactory noUrlsPolicy = builder.toFactory();
PolicyFactory urlsPolicy = builder
.allowUrlsInStyles(AttributePolicy.IDENTITY_ATTRIBUTE_POLICY)
.toFactory();
String unsafeHtml =
"<div style=\"background:"//evil.org/foo.png"\"></div>";
String safeWithUrls =
"<div style=\"background:url('//evil.org/foo.png')\"></div>";
String safeWithoutUrls = "<div></div>";
assertEquals(safeWithoutUrls, noUrlsPolicy.sanitize(unsafeHtml));
assertEquals(safeWithUrls, urlsPolicy.sanitize(unsafeHtml));
}
@Test
public static final void testBackgroundsThatViolateGlobalUrlPolicy() {
PolicyFactory policy = new HtmlPolicyBuilder()
.allowStandardUrlProtocols()
.allowStyling()
.allowElements("div")
.allowUrlsInStyles(AttributePolicy.IDENTITY_ATTRIBUTE_POLICY)
.toFactory();
String unsafeHtml =
"<div style=\"background:'javascript:alert(1337)'\"></div>";
String safeHtml = "<div></div>";
assertEquals(safeHtml, policy.sanitize(unsafeHtml));
}
@Test
public static final void testSpanTagFilter() {
PolicyFactory policy = new HtmlPolicyBuilder()
.allowElements("span")
.allowWithoutAttributes("span")
.toFactory();
String unsafeHtml = policy.sanitize(
"<span>test1</span>");
String safeHtml = policy.sanitize(unsafeHtml);
String expected =
"<span>test1</span>";
assertEquals(expected, safeHtml);
}
@Test
public static final void testLinkRels() {
HtmlPolicyBuilder b = new HtmlPolicyBuilder()
.allowElements("a")
.allowAttributes("href").onElements("a")
.allowAttributes("rel").onElements("a")
.allowAttributes("target").onElements("a")
.allowStandardUrlProtocols();
PolicyFactory defaultLinkPolicy = b.toFactory();
PolicyFactory externalLinkPolicy = b
.requireRelsOnLinks("external")
.toFactory();
PolicyFactory noNoFollowPolicy = new HtmlPolicyBuilder()
.allowElements("a")
.allowAttributes("href").onElements("a")
//.allowAttributes("rel").onElements("a")
.allowStandardUrlProtocols()
.allowAttributes("target").onElements("a")
.skipRelsOnLinks("noreferrer")
.toFactory();
PolicyFactory and0 = externalLinkPolicy.and(noNoFollowPolicy);
PolicyFactory and1 = noNoFollowPolicy.and(externalLinkPolicy);
String link = "<a target=T href=http://example.com/>eg</a>";
assertEquals(
"<a target=\"T\" href=\"http://example.com/\""
+ " rel=\"noopener noreferrer\">eg</a>",
defaultLinkPolicy.sanitize(link));
assertEquals(
"<a target=\"T\" href=\"http://example.com/\""
+ " rel=\"external noopener noreferrer\">eg</a>",
externalLinkPolicy.sanitize(link));
assertEquals(
"<a target=\"T\" href=\"http://example.com/\""
+ " rel=\"noopener\">eg</a>",
noNoFollowPolicy.sanitize(link));
assertEquals(
"<a target=\"T\" href=\"http://example.com/\""
+ " rel=\"external noopener\">eg</a>",
and0.sanitize(link));
assertEquals(
"<a target=\"T\" href=\"http://example.com/\""
+ " rel=\"external noopener\">eg</a>",
and1.sanitize(link));
}
@Test
public static final void testLinkRelsWhenRelPresent() {
PolicyFactory pf = new HtmlPolicyBuilder()
.allowElements("a")
.allowAttributes("href").onElements("a")
.allowAttributes("rel").onElements("a")
.allowAttributes("target").onElements("a")
.allowStandardUrlProtocols()
.requireRelNofollowOnLinks()
.toFactory();
assertEquals(
""
+ "<a rel=\"external nofollow noopener noreferrer\""
+ " target=\"_blank\" href=\"http://example.com/\">eg</a>",
pf.sanitize(
"<a rel=external target=_blank href=http://example.com/>eg</a>"));
assertEquals(
""
+ "<a rel=\"external nofollow noopener noreferrer\""
+ " target=\"windowname\" href=\"//example.com/\">eg</a>",
pf.sanitize(
"<A REL=external TARGET=windowname HREF=//example.com/ >eg</A>"
));
}
@Test
public static final void testRelLinksWhenRelisPartOfData() {
PolicyFactory pf = new HtmlPolicyBuilder()
.allowElements("a")
.allowAttributes("href").onElements("a")
.allowAttributes("rel").onElements("a")
.allowAttributes("target").onElements("a")
.allowStandardUrlProtocols()
.toFactory();
String toSanitize = "<a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://google.com\">test</a>";
assertTrue("Failure in testRelLinksWhenRelisPartOfData", pf.sanitize(toSanitize).equals(toSanitize));
}
@Test
public static final void testFailFastOnSpaceSeparatedStrings() {
boolean failed;
try {
// Should be ("nofollow", "noreferrer")
new HtmlPolicyBuilder().requireRelsOnLinks("nofollow noreferrer");
failed = false;
} catch (@SuppressWarnings("unused") IllegalArgumentException ex) {
failed = true;
}
assertTrue(failed);
try {
new HtmlPolicyBuilder().skipRelsOnLinks("nofollow noreferrer");
failed = false;
} catch (@SuppressWarnings("unused") IllegalArgumentException ex) {
failed = true;
}
assertTrue(failed);
}
@Test
public static final void testEmptyDefaultLinkRelsSet() {
PolicyFactory pf = new HtmlPolicyBuilder()
.allowElements("a")
.allowAttributes("href", "target").onElements("a")
.allowStandardUrlProtocols()
.skipRelsOnLinks("noopener", "noreferrer")
.toFactory();
assertEquals(
"<a href=\"http://example.com\" target=\"_blank\">eg</a>",
pf.sanitize("<a href=\"http://example.com\" target=\"_blank\">eg</a>"));
}
@Test
public static final void testExplicitRelsSkip() {
PolicyFactory pf = new HtmlPolicyBuilder()
.allowElements("a")
.allowAttributes("href", "target", "rel").onElements("a")
.allowStandardUrlProtocols()
.skipRelsOnLinks("noopener", "noreferrer")
.toFactory();
assertEquals(
"<a href=\"http://example.com\" target=\"_blank\">text</a>",
pf.sanitize(
"<a href=\"http://example.com\" target=\"_blank\""
+ " rel=\"noopener\">text</a>"));
assertEquals(
"<a href=\"http://example.com\" target=\"_blank\">text</a>",
pf.sanitize(
"<a href=\"http://example.com\" target=\"_blank\""
+ " rel=\"noreferrer noopener\">text</a>"));
assertEquals(
"<a href=\"http://example.com\" target=\"_blank\" rel=\"nofoo nobar nobaz\">text</a>",
pf.sanitize(
"<a href=\"http://example.com\" target=\"_blank\""
+ " rel=\"nofoo noopener nobar NOREFERRER nobaz \">text</a>"));
}
@Test
public static final void testScopingExitInNoContent() {
PolicyFactory pf = new HtmlPolicyBuilder()
.allowElements("table", "tr", "td", "noscript")
.toFactory();
assertEquals(
"<table><tr><td>foo<noscript></noscript></td><td>bar</td></tr></table>",
pf.sanitize("<table><tr><td>foo<noscript></table></noscript><td>bar"));
}
@Test
public static final void testIssue80() {
PolicyFactory pf = new HtmlPolicyBuilder()
.allowElements("table", "tr", "td", "tbody")
.toFactory();
assertEquals(
"<table><tbody>"
+ "<tr><td>td1</td><td>td2</td></tr>"
+ "<tr><td>new line</td></tr>"
+ "</tbody></table>",
pf.sanitize(
"<table><tbody>"
+ "<tr><td>td1</td><td>td2</tr>"
+ "<td>new line</tbody></table>"));
}
@Test
public static final void testDirLi() {
assertEquals(
"<dir compact=\"compact\"><li>something</li></dir>",
apply(
new HtmlPolicyBuilder()
.allowElements("dir", "li", "ul")
.allowAttributes("compact").onElements("dir"),
"<dir compact=\"compact\"><li>something</li></dir>"));
}
@Test
public static void testScriptTagWithCommentBlockContainingHtmlCommentEnd() {
PolicyFactory scriptSanitizer = new HtmlPolicyBuilder()
// allow scripts of type application/json
.allowElements(
new ElementPolicy() {
public String apply(String elementName, List<String> attrs) {
int typeIndex = attrs.indexOf("type");
if (typeIndex < 0 || attrs.size() < typeIndex + 1
|| !attrs.get(typeIndex + 1).equals("application/json")) {
return null;
}
return elementName;
}
},
"script")
// allow contents in this script tag
.allowTextIn("script")
// keep type attribute in application/json script tag
.allowAttributes("type").matching(true, Set.of("application/json")).onElements("script")
.toFactory();
String mismatchedHtmlComments = "<script type=\"application/json\">\n" +
"<!--\n" +
"{\"field\":\"-->\"}\n" +
"// -->\n" +
"</script>";
assertEquals(
"<script type=\"application/json\"></script>",
scriptSanitizer.sanitize(mismatchedHtmlComments));
String htmlMetaCharsEscaped = "<script type=\"application/json\">\n" +
"<!--\n" +
"{\"field\":\"--\\u003c\"}\n" +
"// -->\n" +
"</script>";
assertEquals(
htmlMetaCharsEscaped,
scriptSanitizer.sanitize(htmlMetaCharsEscaped));
}
@Test
public static final void testNoscriptInAttribute() {
PolicyFactory pf = new HtmlPolicyBuilder()
.allowElements("img", "p", "noscript")
.allowAttributes("title").globally()
.allowAttributes("img").onElements("img")
.toFactory();
assertEquals(
"<noscript>"
+ "<p title=\"</noscript><img src=x onerror=alert(1)>\">"
+ "</p>"
+ "</noscript>",
pf.sanitize(
"<noscript><p title=\"</noscript><img src=x onerror=alert(1)>\">"));
}
@Test
public static final void testTableStructure() {
String input =
"<TABLE>"
+ "<TR><TD>Foo<TD>Bar"
+ "<TR><TH>Baz<TH>Boo<TH>Far<TH>Faz"
+ "<TR><TD>Oink<TD>Doink<TD>Poink<TD>Toink";
String sanitized = Sanitizers.TABLES.sanitize(input);
assertEquals(
("<table><tbody>"
+ "<tr><td>Foo</td><td>Bar</td></tr>"
+ "<tr><th>Baz</th><th>Boo</th><th>Far</th><th>Faz</th></tr>"
+ "<tr><td>Oink</td><td>Doink</td><td>Poink</td><td>Toink</td></tr>"
+ "</tbody></table>"),
sanitized);
}
@Test
public static final void testSvgNames() {
PolicyFactory policyFactory = new HtmlPolicyBuilder()
.allowElements("svg", "animateColor")
.allowAttributes("viewBox").onElements("svg")
.toFactory();
String svg = "<svg viewBox=\"0 0 0 0\"><animateColor></animateColor></svg>";
assertEquals(svg, policyFactory.sanitize(svg));
}