for testing and deploying your application
for finding and fixing issues
for empowering human code reviews
<?php
declare(strict_types=1);
namespace DanBettles\Defence\Filter;
use Closure;
use DanBettles\Defence\Envelope;
use const false;
use const true;
/**
* @phpstan-import-type IncomingFilterOptions from AbstractFilter
*/
class InvalidHeaderFilter extends AbstractFilter
{
* @phpstan-param IncomingFilterOptions $options
public function __construct(
private string $selector,
private Closure $validator,
array $options = []
) {
parent::__construct($options);
}
public function __invoke(Envelope $envelope): bool
$request = $envelope->getRequest();
$headerValue = $request->headers->get($this->getSelector());
$headerValueIsValid = ($this->getValidator())($headerValue);
if (!$headerValueIsValid) {
$this->envelopeAddLogEntry(
$envelope,
"The value of header `{$this->getSelector()}`, `{$headerValue}`, is invalid"
);
return true;
return false;
public function getSelector(): string
return $this->selector;
public function getValidator(): Closure
return $this->validator;
danbettles /
defence
