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dump attributes that contain characters that are impossible for validity, or very unlikely

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This commit is contained in:
Aidan Woods 2017-05-02 00:30:04 +01:00
parent 131ba75851
commit 6d0156d707
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1 changed files with 16 additions and 7 deletions
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23
Parsedown.php
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@ -1503,7 +1503,8 @@ class Parsedown
protected function sanitiseElement(array $Element) protected function sanitiseElement(array $Element)
{ {
$safeUrlNameToAtt = array( static $badAttributeChars = "\"'= \t\n\r\0\x0B";
static $safeUrlNameToAtt = array(
'a' => 'href', 'a' => 'href',
'img' => 'src', 'img' => 'src',
); );
@ -1515,13 +1516,21 @@ class Parsedown
if ( ! empty($Element['attributes'])) if ( ! empty($Element['attributes']))
{ {
# clear out nulls foreach ($Element['attributes'] as $att => $val)
$Element['attributes'] = array_filter( {
$Element['attributes'], # clear out nulls
function ($v) {return $v !== null;} if ($val === null)
); {
unset($Element['attributes'][$att]);
}
# filter out badly parsed attribute
elseif (strpbrk($att, $badAttributeChars) !== false)
{
unset($Element['attributes'][$att]);
}
}
$onEventAttributes = preg_grep('/^\s*+on/i', array_flip($Element['attributes'])); $onEventAttributes = preg_grep('/^on/i', array_flip($Element['attributes']));
foreach ($onEventAttributes as $att) foreach ($onEventAttributes as $att)
{ {