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HtmlFunctionTainter.php
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HtmlFunctionTainter.php
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<?php
namespace Psalm\Internal\Provider\AddRemoveTaints;
use PhpParser;
use Psalm\Internal\Analyzer\StatementsAnalyzer;
use Psalm\Plugin\EventHandler\AddTaintsInterface;
use Psalm\Plugin\EventHandler\Event\AddRemoveTaintsEvent;
use Psalm\Plugin\EventHandler\RemoveTaintsInterface;
use Psalm\Type\TaintKind;
use function count;
use function strtolower;
use const ENT_QUOTES;
/**
* @internal
*/
final class HtmlFunctionTainter implements AddTaintsInterface, RemoveTaintsInterface
{
/**
* Called to see what taints should be added
*
* @return list<string>
*/
public static function addTaints(AddRemoveTaintsEvent $event): array
{
$item = $event->getExpr();
$statements_analyzer = $event->getStatementsSource();
if (!$statements_analyzer instanceof StatementsAnalyzer
|| !$item instanceof PhpParser\Node\Expr\FuncCall
|| $item->isFirstClassCallable()
|| !$item->name instanceof PhpParser\Node\Name
|| count($item->name->getParts()) !== 1
|| count($item->getArgs()) === 0
) {
return [];
}
$function_id = strtolower($item->name->getFirst());
if ($function_id === 'html_entity_decode'
|| $function_id === 'htmlspecialchars_decode'
) {
$second_arg = $item->getArgs()[1]->value ?? null;
if ($second_arg === null) {
if ($statements_analyzer->getCodebase()->analysis_php_version_id >= 8_01_00) {
return [TaintKind::INPUT_HTML, TaintKind::INPUT_HAS_QUOTES];
}
return [TaintKind::INPUT_HTML];
}
$second_arg_value = $statements_analyzer->node_data->getType($second_arg);
if (!$second_arg_value || !$second_arg_value->isSingleIntLiteral()) {
return [TaintKind::INPUT_HTML];
}
$second_arg_value = $second_arg_value->getSingleIntLiteral()->value;
if (($second_arg_value & ENT_QUOTES) === ENT_QUOTES) {
return [TaintKind::INPUT_HTML, TaintKind::INPUT_HAS_QUOTES];
}
return [TaintKind::INPUT_HTML];
}
return [];
}
/**
* Called to see what taints should be removed
*
* @return list<string>
*/
public static function removeTaints(AddRemoveTaintsEvent $event): array
{
$item = $event->getExpr();
$statements_analyzer = $event->getStatementsSource();
if (!$statements_analyzer instanceof StatementsAnalyzer
|| !$item instanceof PhpParser\Node\Expr\FuncCall
|| $item->isFirstClassCallable()
|| !$item->name instanceof PhpParser\Node\Name
|| count($item->name->getParts()) !== 1
|| count($item->getArgs()) === 0
) {
return [];
}
$function_id = strtolower($item->name->getFirst());
if ($function_id === 'htmlentities'
|| $function_id === 'htmlspecialchars'
) {
$second_arg = $item->getArgs()[1]->value ?? null;
if ($second_arg === null) {
if ($statements_analyzer->getCodebase()->analysis_php_version_id >= 8_01_00) {
return [TaintKind::INPUT_HTML, TaintKind::INPUT_HAS_QUOTES];
}
return [TaintKind::INPUT_HTML];
}
$second_arg_value = $statements_analyzer->node_data->getType($second_arg);
if (!$second_arg_value || !$second_arg_value->isSingleIntLiteral()) {
return [TaintKind::INPUT_HTML];
}
$second_arg_value = $second_arg_value->getSingleIntLiteral()->value;
if (($second_arg_value & ENT_QUOTES) === ENT_QUOTES) {
return [TaintKind::INPUT_HTML, TaintKind::INPUT_HAS_QUOTES];
}
return [TaintKind::INPUT_HTML];
}
return [];
}
}