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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Unit tests for the HTMLPurifier integration
*
* @package core
* @category phpunit
* @copyright 2012 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* HTMLPurifier test case
*
* @package core
* @category phpunit
* @copyright 2012 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class core_htmlpurifier_testcase extends basic_testcase {
/**
* Verify _blank target is allowed.
*/
public function test_allow_blank_target() {
// See MDL-52651 for an explanation as to why the rel="noreferrer" attribute is expected here.
// Also note we do not need to test links with an existing rel attribute as the HTML Purifier is configured to remove
// the rel attribute.
$text = '<a href="http://moodle.org" target="_blank">Some link</a>';
$expected = '<a href="http://moodle.org" target="_blank" rel="noreferrer noopener">Some link</a>';
$result = format_text($text, FORMAT_HTML);
$this->assertSame($expected, $result);
$result = format_text('<a href="http://moodle.org" target="some">Some link</a>', FORMAT_HTML);
$this->assertSame('<a href="http://moodle.org">Some link</a>', $result);
}
/**
* Verify our nolink tag accepted.
*/
public function test_nolink() {
// We can not use format text because nolink changes result.
$text = '<nolink><div>no filters</div></nolink>';
$result = purify_html($text, array());
$this->assertSame($text, $result);
$text = '<nolink>xxx<em>xx</em><div>xxx</div></nolink>';
$result = purify_html($text, array());
$this->assertSame($text, $result);
// Ensure nolink doesn't force open tags to be closed, so can be virtually everywhere.
$text = '<p><nolink><div>no filters</div></nolink></p>';
$result = purify_html($text, array());
$this->assertSame($text, $result);
}
/**
* Verify our tex tag accepted.
*/
public function test_tex() {
$text = '<tex>a+b=c</tex>';
$result = purify_html($text, array());
$this->assertSame($text, $result);
}
/**
* Verify our algebra tag accepted.
*/
public function test_algebra() {
$text = '<algebra>a+b=c</algebra>';
$result = purify_html($text, array());
$this->assertSame($text, $result);
}
/**
* Verify our hacky multilang works.
*/
public function test_multilang() {
$text = '<lang lang="en">hmmm</lang><lang lang="anything">hm</lang>';
$result = purify_html($text, array());
$this->assertSame($text, $result);
$text = '<span lang="en" class="multilang">hmmm</span><span lang="anything" class="multilang">hm</span>';
$result = purify_html($text, array());
$this->assertSame($text, $result);
$text = '<span lang="en">hmmm</span>';
$result = purify_html($text, array());
$this->assertNotSame($text, $result);
// Keep standard lang tags.
$text = '<span lang="de_DU" class="multilang">asas</span>';
$result = purify_html($text, array());
$this->assertSame($text, $result);
$text = '<lang lang="de_DU">xxxxxx</lang>';
$result = purify_html($text, array());
$this->assertSame($text, $result);
}
/**
* Tests the 'allowid' option for format_text.
*/
public function test_format_text_allowid() {
// Start off by not allowing ids (default).
$options = array(
'nocache' => true
);
$result = format_text('<div id="example">Frog</div>', FORMAT_HTML, $options);
$this->assertSame('<div>Frog</div>', $result);
// Now allow ids.
$options['allowid'] = true;
$result = format_text('<div id="example">Frog</div>', FORMAT_HTML, $options);
$this->assertSame('<div id="example">Frog</div>', $result);
}
public function test_allowobjectembed() {
global $CFG;
$this->assertSame('0', $CFG->allowobjectembed);
$text = '<object width="425" height="350">
<param name="movie" value="http://www.youtube.com/v/AyPzM5WK8ys" />
<param name="wmode" value="transparent" />
<embed src="http://www.youtube.com/v/AyPzM5WK8ys" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350" />
</object>hmmm';
$result = purify_html($text, array());
$this->assertSame('hmmm', trim($result));
$CFG->allowobjectembed = '1';
$expected = '<object width="425" height="350" data="http://www.youtube.com/v/AyPzM5WK8ys" type="application/x-shockwave-flash">
<param name="allowScriptAccess" value="never" />
<param name="allowNetworking" value="internal" />
<param name="movie" value="http://www.youtube.com/v/AyPzM5WK8ys" />
<param name="wmode" value="transparent" />
<embed src="http://www.youtube.com/v/AyPzM5WK8ys" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350" allowscriptaccess="never" allownetworking="internal" />
</object>hmmm';
$result = purify_html($text, array());
$this->assertSame(str_replace("\n", '', $expected), str_replace("\n", '', $result));
$CFG->allowobjectembed = '0';
$result = purify_html($text, array());
$this->assertSame('hmmm', trim($result));
}
/**
* Test if linebreaks kept unchanged.
*/
public function test_line_breaking() {
$text = "\n\raa\rsss\nsss\r";
$this->assertSame($text, purify_html($text));
}
/**
* Test fixing of strict problems.
*/
public function test_tidy() {
$text = "<p>xx";
$this->assertSame('<p>xx</p>', purify_html($text));
$text = "<P>xx</P>";
$this->assertSame('<p>xx</p>', purify_html($text));
$text = "xx<br>";
$this->assertSame('xx<br />', purify_html($text));
}
/**
* Test nesting - this used to cause problems in earlier versions.
*/
public function test_nested_lists() {
$text = "<ul><li>One<ul><li>Two</li></ul></li><li>Three</li></ul>";
$this->assertSame($text, purify_html($text));
}
/**
* Test that XSS protection works, complete smoke tests are in htmlpurifier itself.
*/
public function test_cleaning_nastiness() {
$text = "x<SCRIPT>alert('XSS')</SCRIPT>x";
$this->assertSame('xx', purify_html($text));
$text = '<DIV STYLE="background-image:url(javascript:alert(\'XSS\'))">xx</DIV>';
$this->assertSame('<div>xx</div>', purify_html($text));
$text = '<DIV STYLE="width:expression(alert(\'XSS\'));">xx</DIV>';
$this->assertSame('<div>xx</div>', purify_html($text));
$text = 'x<IFRAME SRC="javascript:alert(\'XSS\');"></IFRAME>x';
$this->assertSame('xx', purify_html($text));
$text = 'x<OBJECT TYPE="text/x-scriptlet" DATA="http://ha.ckers.org/scriptlet.html"></OBJECT>x';
$this->assertSame('xx', purify_html($text));
$text = 'x<EMBED SRC="http://ha.ckers.org/xss.swf" AllowScriptAccess="always"></EMBED>x';
$this->assertSame('xx', purify_html($text));
$text = 'x<form></form>x';
$this->assertSame('xx', purify_html($text));
}
/**
* Test internal function used for clean_text() speedup.
*/
public function test_is_purify_html_necessary() {
// First our shortcuts.
$text = "";
$this->assertFalse(is_purify_html_necessary($text));
$this->assertSame($text, purify_html($text));
$text = "666";
$this->assertFalse(is_purify_html_necessary($text));
$this->assertSame($text, purify_html($text));
$text = "abc\ndef \" ' ";
$this->assertFalse(is_purify_html_necessary($text));
$this->assertSame($text, purify_html($text));
$text = "abc\n<p>def</p>efg<p>hij</p>";
$this->assertFalse(is_purify_html_necessary($text));
$this->assertSame($text, purify_html($text));
$text = "<br />abc\n<p>def<em>efg</em><strong>hi<br />j</strong></p>";
$this->assertFalse(is_purify_html_necessary($text));
$this->assertSame($text, purify_html($text));
// Now failures.
$text = " ";
$this->assertTrue(is_purify_html_necessary($text));
$text = "Gin & Tonic";
$this->assertTrue(is_purify_html_necessary($text));
$text = "Gin > Tonic";
$this->assertTrue(is_purify_html_necessary($text));
$text = "Gin < Tonic";
$this->assertTrue(is_purify_html_necessary($text));
$text = "<div>abc</div>";
$this->assertTrue(is_purify_html_necessary($text));
$text = "<span>abc</span>";
$this->assertTrue(is_purify_html_necessary($text));
$text = "<br>abc";
$this->assertTrue(is_purify_html_necessary($text));
$text = "<p class='xxx'>abc</p>";
$this->assertTrue(is_purify_html_necessary($text));
$text = "<p>abc<em></p></em>";
$this->assertTrue(is_purify_html_necessary($text));
$text = "<p>abc";
$this->assertTrue(is_purify_html_necessary($text));
}
public function test_allowed_schemes() {
// First standard schemas.
$text = '<a href="http://www.example.com/course/view.php?id=5">link</a>';
$this->assertSame($text, purify_html($text));
$text = '<a href="https://www.example.com/course/view.php?id=5">link</a>';
$this->assertSame($text, purify_html($text));
$text = '<a href="ftp://user@ftp.example.com/some/file.txt">link</a>';
$this->assertSame($text, purify_html($text));
$text = '<a href="nntp://example.com/group/123">link</a>';
$this->assertSame($text, purify_html($text));
$text = '<a href="news:groupname">link</a>';
$this->assertSame($text, purify_html($text));
$text = '<a href="mailto:user@example.com">link</a>';
$this->assertSame($text, purify_html($text));
// Extra schemes allowed in moodle.
$text = '<a href="irc://irc.example.com/3213?pass">link</a>';
$this->assertSame($text, purify_html($text));
$text = '<a href="rtsp://www.example.com/movie.mov">link</a>';
$this->assertSame($text, purify_html($text));
$text = '<a href="rtmp://www.example.com/video.f4v">link</a>';
$this->assertSame($text, purify_html($text));
$text = '<a href="teamspeak://speak.example.com/?par=val?par2=val2">link</a>';
$this->assertSame($text, purify_html($text));
$text = '<a href="gopher://gopher.example.com/resource">link</a>';
$this->assertSame($text, purify_html($text));
$text = '<a href="mms://www.example.com/movie.mms">link</a>';
$this->assertSame($text, purify_html($text));
// Now some borked or dangerous schemes.
$text = '<a href="javascript://www.example.com">link</a>';
$this->assertSame('<a>link</a>', purify_html($text));
$text = '<a href="hmmm://www.example.com">link</a>';
$this->assertSame('<a>link</a>', purify_html($text));
}
/**
* Test non-ascii domain names
*/
public function test_idn() {
// Example of domain that gives the same result in IDNA2003 and IDNA2008 .
$text = '<a href="http://правительство.рф">правительство.рф</a>';
$expected = '<a href="http://xn--80aealotwbjpid2k.xn--p1ai">правительство.рф</a>';
$this->assertSame($expected, purify_html($text));
// Examples of deviations from http://www.unicode.org/reports/tr46/#Table_Deviation_Characters .
$text = '<a href="http://teßt.de">teßt.de</a>';
$expected = '<a href="http://xn--tet-6ka.de">teßt.de</a>';
$this->assertSame($expected, purify_html($text));
$text = '<a href="http://βόλος.com">http://βόλος.com</a>';
$expected = '<a href="http://xn--nxasmm1c.com">http://βόλος.com</a>';
$this->assertSame($expected, purify_html($text));
$text = '<a href="http://نامهای.com">http://نامهای.com</a>';
$expected = '<a href="http://xn--mgba3gch31f060k.com">http://نامهای.com</a>';
$this->assertSame($expected, purify_html($text));
}
/**
* Tests media tags.
*
* @dataProvider media_tags_provider
* @param string $mediatag HTML media tag
* @param string $expected expected result
*/
public function test_media_tags($mediatag, $expected) {
$actual = format_text($mediatag, FORMAT_MOODLE, ['filter' => false]);
$this->assertEquals($expected, $actual);
}
/**
* Test cases for the test_media_tags test.
*/
public function media_tags_provider() {
// Takes an array of attributes, then generates a test for each of them.
$generatetestcases = function($prefix, array $attrs, array $templates) {
return array_reduce($attrs, function($carry, $attr) use ($prefix, $templates) {
$testcase = [$prefix . '/' . $attr => [
sprintf($templates[0], $attr),
sprintf($templates[1], $attr)
]];
return empty(array_values($carry)[0]) ? $testcase : $carry + $testcase;
}, [[]]);
};
$audioattrs = [
'preload="auto"', 'autoplay=""', 'loop=""', 'muted=""', 'controls=""',
'crossorigin="anonymous"', 'crossorigin="use-credentials"'
];
$videoattrs = [
'crossorigin="anonymous"', 'crossorigin="use-credentials"',
'poster="https://upload.wikimedia.org/wikipedia/en/1/14/Space_jam.jpg"',
'preload="auto"', 'autoplay=""', 'playsinline=""', 'loop=""', 'muted=""',
'controls=""', 'width="420"', 'height="69"'
];
return $generatetestcases('Plain audio', $audioattrs + ['src="http://example.com/jam.wav"'], [
'<audio %1$s>Looks like you can\'t slam the jams.</audio>',
'<div class="text_to_html"><audio %1$s>Looks like you can\'t slam the jams.</audio></div>'
]) + $generatetestcases('Audio with one source', $audioattrs, [
'<audio %1$s><source src="http://example.com/getup.wav">No tasty jams for you.</audio>',
'<div class="text_to_html">' .
'<audio %1$s>' .
'<source src="http://example.com/getup.wav" />' .
'No tasty jams for you.' .
'</audio>' .
'</div>'
]) + $generatetestcases('Audio with multiple sources', $audioattrs, [
'<audio %1$s>' .
'<source src="http://example.com/getup.wav" type="audio/wav">' .
'<source src="http://example.com/getup.mp3" type="audio/mpeg">' .
'<source src="http://example.com/getup.ogg" type="audio/ogg">' .
'No tasty jams for you.' .
'</audio>',
'<div class="text_to_html">' .
'<audio %1$s>' .
'<source src="http://example.com/getup.wav" type="audio/wav" />' .
'<source src="http://example.com/getup.mp3" type="audio/mpeg" />' .
'<source src="http://example.com/getup.ogg" type="audio/ogg" />' .
'No tasty jams for you.' .
'</audio>' .
'</div>'
]) + $generatetestcases('Audio with sources and tracks', $audioattrs, [
'<audio %1$s>' .
'<source src="http://example.com/getup.wav" type="audio/wav">' .
'<track kind="subtitles" src="http://example.com/subtitles_en.vtt" label="English" srclang="en">' .
'<track kind="subtitles" src="http://example.com/subtitles_es.vtt" label="Espanol" srclang="es">' .
'No tasty jams for you.' .
'</audio>',
'<div class="text_to_html">' .
'<audio %1$s>' .
'<source src="http://example.com/getup.wav" type="audio/wav" />' .
'<track kind="subtitles" src="http://example.com/subtitles_en.vtt" label="English" srclang="en" />' .
'<track kind="subtitles" src="http://example.com/subtitles_es.vtt" label="Espanol" srclang="es" />' .
'No tasty jams for you.' .
'</audio>' .
'</div>'
]) + $generatetestcases('Plain video', $videoattrs + ['src="http://example.com/prettygood.mp4'], [
'<video %1$s>Oh, that\'s pretty bad 😦</video>',
'<div class="text_to_html"><video %1$s>Oh, that\'s pretty bad 😦</video></div>'
]) + $generatetestcases('Video with illegal subtag', $videoattrs + ['src="http://example.com/prettygood.mp4'], [
'<video %1$s><subtag></subtag>Oh, that\'s pretty bad 😦</video>',
'<div class="text_to_html"><video %1$s>Oh, that\'s pretty bad 😦</video></div>'
]) + $generatetestcases('Video with legal subtag', $videoattrs + ['src="http://example.com/prettygood.mp4'], [
'<video %1$s>Did not work <a href="http://example.com/prettygood.mp4">click here to download</a></video>',
'<div class="text_to_html"><video %1$s>Did not work <a href="http://example.com/prettygood.mp4">' .
'click here to download</a></video></div>'
]) + $generatetestcases('Source tag without video or audio', $videoattrs, [
'some text <source src="http://example.com/getup.wav" type="audio/wav"> the end',
'<div class="text_to_html">some text the end</div>'
]) + $generatetestcases('Video with one source', $videoattrs, [
'<video %1$s><source src="http://example.com/prettygood.mp4">Oh, that\'s pretty bad 😦</video>',
'<div class="text_to_html">' .
'<video %1$s>' .
'<source src="http://example.com/prettygood.mp4" />' .
'Oh, that\'s pretty bad 😦' .
'</video>' .
'</div>'
]) + $generatetestcases('Video with multiple sources', $videoattrs, [
'<video %1$s>' .
'<source src="http://example.com/prettygood.mp4" type="video/mp4">' .
'<source src="http://example.com/eljefe.mp4" type="video/mp4">' .
'<source src="http://example.com/turnitup.mov" type="video/mov">' .
'Oh, that\'s pretty bad 😦' .
'</video>',
'<div class="text_to_html">' .
'<video %1$s>' .
'<source src="http://example.com/prettygood.mp4" type="video/mp4" />' .
'<source src="http://example.com/eljefe.mp4" type="video/mp4" />' .
'<source src="http://example.com/turnitup.mov" type="video/mov" />' .
'Oh, that\'s pretty bad 😦' .
'</video>' .
'</div>'
]) + $generatetestcases('Video with sources and tracks', $audioattrs, [
'<video %1$s>' .
'<source src="http://example.com/getup.wav" type="audio/wav">' .
'<track kind="subtitles" src="http://example.com/subtitles_en.vtt" label="English" srclang="en">' .
'<track kind="subtitles" src="http://example.com/subtitles_es.vtt" label="Espanol" srclang="es">' .
'No tasty jams for you.' .
'</video>',
'<div class="text_to_html">' .
'<video %1$s>' .
'<source src="http://example.com/getup.wav" type="audio/wav" />' .
'<track kind="subtitles" src="http://example.com/subtitles_en.vtt" label="English" srclang="en" />' .
'<track kind="subtitles" src="http://example.com/subtitles_es.vtt" label="Espanol" srclang="es" />' .
'No tasty jams for you.' .
'</video>' .
'</div>'
]) + ['Video with invalid crossorigin' => [
'<video src="http://example.com/turnitup.mov" crossorigin="can i pls hab?">' .
'Oh, that\'s pretty bad 😦' .
'</video>',
'<div class="text_to_html">' .
'<video src="http://example.com/turnitup.mov">' .
'Oh, that\'s pretty bad 😦' .
'</video>' .
'</div>'
]] + ['Audio with invalid crossorigin' => [
'<audio src="http://example.com/getup.wav" crossorigin="give me. the jams.">' .
'nyemnyemnyem' .
'</audio>',
'<div class="text_to_html">' .
'<audio src="http://example.com/getup.wav">' .
'nyemnyemnyem' .
'</audio>' .
'</div>'
]] + ['Other attributes' => [
'<video src="http://example.com/turnitdown.mov" class="nofilter" data-something="data attribute" someattribute="somevalue" onclick="boom">' .
'<source src="http://example.com/getup.wav" type="audio/wav" class="shouldberemoved" data-sourcedata="source data" onmouseover="kill session" />' .
'<track src="http://example.com/subtitles_en.vtt" class="shouldberemoved" data-trackdata="track data" onmouseover="removeme" />' .
'Do not remove attribute class but remove other attributes' .
'</video>',
'<div class="text_to_html">' .
'<video src="http://example.com/turnitdown.mov" class="nofilter">' .
'<source src="http://example.com/getup.wav" type="audio/wav" />' .
'<track src="http://example.com/subtitles_en.vtt" />' .
'Do not remove attribute class but remove other attributes' .
'</video>' .
'</div>'
]];
}
}