<?php

namespace PSX\Http\Filter;

use PSX\Http\FilterChainInterface;
use PSX\Http\FilterInterface;
use PSX\Http\RequestInterface;
use PSX\Http\ResponseInterface;

/**
 * HSTS
 *
 * @author  Christoph Kappestein <christoph.kappestein@gmail.com>
 * @license http://www.apache.org/licenses/LICENSE-2.0
 * @link    http://phpsx.org
 */
class HSTS implements FilterInterface
{
    const INCLUDE_SUB_DOMAINS = 1;
    const PRELOAD = 2;

    /** @var integer */
    protected $maxAge;

    /** @var integer */
    protected $mode;

    /**
     * @param integer $maxAge
     * @param integer|null $mode
     */
    public function __construct($maxAge, $mode = null)
    {
        $this->maxAge = $maxAge;
        $this->mode   = $mode;
    }

    /**
     * @inheritdoc
     */
    public function handle(RequestInterface $request, ResponseInterface $response, FilterChainInterface $filterChain)
    {
        if ($this->maxAge > 0) {
            $mode = '';
            if ($this->mode === self::INCLUDE_SUB_DOMAINS) {
                $mode = '; includeSubDomains';
            } elseif ($this->mode === self::PRELOAD) {
                $mode = '; preload';
            }

            $response->setHeader('Strict-Transport-Security', 'max-age=' . $this->maxAge . $mode);
        }

        $filterChain->handle($request, $response);
    }
}
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