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Move HTML purification to own method in Content\Text\HTML

This commit is contained in:
Hypolite Petovan 2021-03-14 13:40:32 -04:00
parent 5b8f7361ea
commit 93823ecef5
3 changed files with 69 additions and 26 deletions
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32
src/Content/Text/BBCode.php
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@ -29,12 +29,10 @@ use Friendica\Content\Item;
use Friendica\Content\OEmbed;
use Friendica\Content\PageInfo;
use Friendica\Content\Smilies;
use Friendica\Content\Text\HTMLPurifier_URIScheme_cid;
use Friendica\Core\Hook;
use Friendica\Core\Logger;
use Friendica\Core\Protocol;
use Friendica\Core\Renderer;
use Friendica\Core\System;
use Friendica\DI;
use Friendica\Model\Contact;
use Friendica\Model\Event;
@ -1877,28 +1875,16 @@ class BBCode
$text
);
\HTMLPurifier_URISchemeRegistry::instance()->register('cid', new HTMLPurifier_URIScheme_cid());
// Default iframe allowed domains/path
$allowedIframeDomains = [
DI::baseUrl()->getHostname()
. (DI::baseUrl()->getUrlPath() ? '/' . DI::baseUrl()->getUrlPath() : '')
. '/oembed/', # The path part has to change with the source in Content\Oembed::iframe
'www.youtube.com/embed/',
'player.vimeo.com/video/',
];
$config = \HTMLPurifier_HTML5Config::createDefault();
$config->set('HTML.Doctype', 'HTML5');
$config->set('HTML.SafeIframe', true);
$config->set('URI.SafeIframeRegexp', '%^(?:
https://www.youtube.com/embed/
|
https://player.vimeo.com/video/
|
' . DI::baseUrl() . '/oembed/ # Has to change with the source in Content\Oembed::iframe
)%xi');
$config->set('Attr.AllowedRel', [
'noreferrer' => true,
'noopener' => true,
]);
$config->set('Attr.AllowedFrameTargets', [
'_blank' => true,
]);
$HTMLPurifier = new \HTMLPurifier($config);
$text = $HTMLPurifier->purify($text);
$text = HTML::purify($text, $allowedIframeDomains);
return $text;
}

59
src/Content/Text/HTML.php
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@ -961,4 +961,63 @@ class HTML
{
return str_replace('&', '&', $s);
}
/**
* Clean an HTML text for potentially harmful code
*
* @param string $text
* @param array $allowedIframeDomains List of allowed iframe source domains without the scheme
* @return string
*/
public static function purify(string $text, array $allowedIframeDomains = []): string
{
// Allows cid: URL scheme
\HTMLPurifier_URISchemeRegistry::instance()->register('cid', new HTMLPurifier_URIScheme_cid());
$config = \HTMLPurifier_HTML5Config::createDefault();
$config->set('HTML.Doctype', 'HTML5');
// Used to remove iframe with src attribute filtered out
$config->set('AutoFormat.RemoveEmpty', true);
$config->set('HTML.SafeIframe', true);
array_walk($allowedIframeDomains, function (&$domain) {
// Allow the domain and all its eventual sub-domains
$domain = '(?:(?!-)[A-Za-z0-9-]{1,63}(?<!-)\.)*' . preg_quote(trim($domain, '/'), '%');
});
$config->set('URI.SafeIframeRegexp',
'%^https://(?:
' . implode('|', $allowedIframeDomains) . '
)
(?:/|$) # Prevents bogus domains like youtube.com.fake.tld
%xi'
);
$config->set('Attr.AllowedRel', [
'noreferrer' => true,
'noopener' => true,
]);
$config->set('Attr.AllowedFrameTargets', [
'_blank' => true,
]);
/* Uncomment to debug HTMLPurifier behavior
$config->set('Core.CollectErrors', true);
$config->set('Core.MaintainLineNumbers', true);
*/
$HTMLPurifier = new \HTMLPurifier($config);
$text = $HTMLPurifier->purify($text);
/** @var \HTMLPurifier_ErrorCollector $errorCollector */
/* Uncomment to debug HTML Purifier behavior
$errorCollector = $HTMLPurifier->context->get('ErrorCollector');
var_dump($errorCollector->getRaw());
*/
return $text;
}
}

4
src/Module/Debug/Babel.php
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@ -180,9 +180,7 @@ class Babel extends BaseModule
'content' => $html
];
$config = \HTMLPurifier_Config::createDefault();
$HTMLPurifier = new \HTMLPurifier($config);
$purified = $HTMLPurifier->purify($html);
$purified = Text\HTML::purify($html);
$results[] = [
'title' => DI::l10n()->t('HTML Purified (raw)'),