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Ward against preg_replace_callback null return value in Strings::performWithEscapedBlocks

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- Add logging to troubleshoot potential issue with regex
- Address part of https://github.com/friendica/friendica/issues/12011#issuecomment-1335124938
This commit is contained in:
Hypolite Petovan 2022-12-02 08:10:16 -05:00
parent 3b3192933d
commit e6f8b8c6e0
1 changed files with 7 additions and 2 deletions
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9
src/Util/Strings.php
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@ -23,6 +23,7 @@ namespace Friendica\Util;
use Friendica\Content\ContactSelector;
use Friendica\Core\Logger;
use Friendica\Core\System;
use ParagonIE\ConstantTime\Base64;
/**
@ -480,7 +481,7 @@ class Strings
$blocks = [];
$text = preg_replace_callback($regex,
$return = preg_replace_callback($regex,
function ($matches) use ($executionId, &$blocks) {
$return = '«block-' . $executionId . '-' . count($blocks) . '»';
@ -491,7 +492,11 @@ class Strings
$text
);
$text = $callback($text) ?? '';
if (is_null($return)) {
Logger::warning('Received null value from preg_replace_callback', ['text' => $text, 'regex' => $regex, 'blocks' => $blocks, 'executionId' => $executionId, 'callstack' => System::callstack(10)]);
}
$text = $callback($return ?? $text) ?? '';
// Restore code blocks
$text = preg_replace_callback('/«block-' . $executionId . '-([0-9]+)»/iU',