<?php

namespace PSX\Http\Filter;

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

/**
 * Uses http headers to control the browser cache of the client
 *
 * @author  Christoph Kappestein <christoph.kappestein@gmail.com>
 * @license http://www.apache.org/licenses/LICENSE-2.0
 * @link    http://phpsx.org
 */
class BrowserCache implements FilterInterface
{
    const TYPE_PUBLIC = 0x1;
    const TYPE_PRIVATE = 0x2;
    const NO_CACHE = 0x4;
    const NO_STORE = 0x8;
    const NO_TRANSFORM = 0x10;
    const MUST_REVALIDATE = 0x20;
    const PROXY_REVALIDATE = 0x40;

    protected $flags;
    protected $maxAge;
    protected $sMaxAge;
    protected $expires;

    public function __construct($flags = 0, $maxAge = null, $sMaxAge = null, \DateTime $expires = null)
    {
        $this->flags   = $flags;
        $this->maxAge  = $maxAge;
        $this->sMaxAge = $sMaxAge;
        $this->expires = $expires;
    }

    public function setMaxAge($maxAge)
    {
        $this->maxAge = $maxAge;
    }

    public function setSMaxAge($sMaxAge)
    {
        $this->sMaxAge = $sMaxAge;
    }

    public function setExpires(\DateTime $expires)
    {
        $this->expires = $expires;
    }

    public function handle(RequestInterface $request, ResponseInterface $response, FilterChainInterface $filterChain)
    {
        $cacheControl = array();

        if ($this->flags & self::TYPE_PUBLIC) {
            $cacheControl[] = 'public';
        }

        if ($this->flags & self::TYPE_PRIVATE) {
            $cacheControl[] = 'private';
        }

        if ($this->flags & self::NO_CACHE) {
            $cacheControl[] = 'no-cache';
        }

        if ($this->flags & self::NO_STORE) {
            $cacheControl[] = 'no-store';
        }

        if ($this->flags & self::NO_TRANSFORM) {
            $cacheControl[] = 'no-transform';
        }

        if ($this->flags & self::MUST_REVALIDATE) {
            $cacheControl[] = 'must-revalidate';
        }

        if ($this->flags & self::PROXY_REVALIDATE) {
            $cacheControl[] = 'proxy-revalidate';
        }

        if ($this->maxAge !== null) {
            $cacheControl[] = 'max-age=' . intval($this->maxAge);
        }

        if ($this->sMaxAge !== null) {
            $cacheControl[] = 's-maxage=' . intval($this->sMaxAge);
        }

        if (!empty($cacheControl)) {
            $response->setHeader('Cache-Control', implode(', ', $cacheControl));
        }

        if ($this->expires !== null) {
            $response->setHeader('Expires', $this->expires->format('D, d M Y H:i:s \G\M\T'));
        }

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

    public static function expires(\DateTime $expires)
    {
        return new self(0, null, null, $expires);
    }

    public static function cacheControl($flags = 0, $maxAge = null, $sMaxAge = null)
    {
        return new self($flags, $maxAge, $sMaxAge);
    }

    public static function preventCache()
    {
        return new self(
            self::NO_STORE | self::NO_CACHE | self::MUST_REVALIDATE,
            null,
            null,
            new \DateTime('1986-10-09')
        );
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----ODM5NDMyOTM5NDc4MjYyMyA4OTk3OTY4NDQ5NjYwMTQ5IDQ3NTMwMzYwOTU0MzA2Mw==