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[markdown] Limit HTML escaping to left chevrons 

- Right chevrons are used for quotation in Markdown
This commit is contained in:
Hypolite Petovan 2021-10-18 09:13:47 -04:00
parent 43b0b5a0e4
commit 54ef923499
1 changed files with 3 additions and 2 deletions
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markdown/markdown.php
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@ -56,9 +56,10 @@ function markdown_post_local_start(App $a, &$request) {
// Escape mentions which username can contain Markdown-like characters
// See https://github.com/friendica/friendica/issues/9486
return \Friendica\Util\Strings::performWithEscapedBlocks($body, '/[@!][^@\s]+@[^\s]+\w/', function ($text) {
// Markdown accepts literal HTML but we do not in post body, so we need to escape all chevrons
// Markdown accepts literal HTML but we do not in post body, so we need to escape left chevrons
// (right chevrons are used for quoting in Markdown)
// See https://github.com/friendica/friendica/issues/10634
$text = \Friendica\Util\Strings::escapeHtml($text);
$text = strtr($text, ['<' => '&lt;']);
return Markdown::toBBCode($text);
});