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<?php |
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/* |
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* This file is part of the slince/cakephp-pjax package. |
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* |
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* (c) Slince <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Slince\Pjax\Middleware; |
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use Cake\Network\Response; |
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use Slince\Pjax\Helper\PjaxHelper; |
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use Symfony\Component\DomCrawler\Crawler; |
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use Cake\Network\Request; |
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class PjaxMiddleware |
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{ |
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/** |
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* @var PjaxHelper |
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*/ |
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protected $helper; |
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/** |
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* The DomCrawler instance. |
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* |
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* @var \Symfony\Component\DomCrawler\Crawler |
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*/ |
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protected $crawler; |
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public function __construct() |
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{ |
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$this->helper = PjaxHelper::instance(); |
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} |
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/** |
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* Handle an incoming request. |
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* |
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* @param Request $request |
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* @param Response $response |
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* @param \Closure $next |
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* |
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* @return Response |
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*/ |
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public function __invoke($request, $response, $next) |
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{ |
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if ($isPjax = $this->helper->isPjaxRequest($request)) { |
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$request = $this->setRequestAttribute($request); |
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} |
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$response = $next($request, $response); |
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if (!$isPjax || $this->isRedirectionResponse($response)) { |
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return $response; |
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} |
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$response = $this->filterResponse($response, $this->helper->getContainer($request)); |
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$response = $this->setUriHeader($response, $request); |
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$response = $this->setVersionHeader($response); |
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return $response; |
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} |
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/** |
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* @param Response $response |
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* @param string $container |
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* |
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* @return Response |
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*/ |
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protected function filterResponse(Response $response, $container) |
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{ |
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$crawler = $this->getCrawler($response->getBody()); |
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return $response->withStringBody( |
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$this->makeTitle($crawler) |
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.$this->fetchContainer($crawler, $container) |
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); |
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} |
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/** |
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* @param Request $request |
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* |
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* @return Request |
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*/ |
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protected function setRequestAttribute(Request $request) |
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{ |
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return $request->withAttribute('IS_PJAX', true); |
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} |
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/** |
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* @param \Symfony\Component\DomCrawler\Crawler $crawler |
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* |
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* @return null|string |
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*/ |
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protected function makeTitle(Crawler $crawler) |
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{ |
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$pageTitle = $crawler->filter('head > title'); |
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if (!$pageTitle->count()) { |
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return null; |
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} |
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return "<title>{$pageTitle->html()}</title>"; |
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} |
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/** |
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* @param \Symfony\Component\DomCrawler\Crawler $crawler |
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* @param string $container |
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* |
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* @return string |
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*/ |
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protected function fetchContainer(Crawler $crawler, $container) |
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{ |
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$content = $crawler->filter($container); |
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if (!$content->count()) { |
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return null; |
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} |
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return $content->html(); |
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} |
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/** |
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* @param Response $response |
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* @param Request $request |
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* |
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* @return Response |
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*/ |
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protected function setUriHeader(Response $response, Request $request) |
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{ |
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return $response->withHeader('X-PJAX-URL', (string) $request->getUri()); |
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} |
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/** |
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* @param Response $response |
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* |
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* @return Response |
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*/ |
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protected function setVersionHeader(Response $response) |
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{ |
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$crawler = $this->getCrawler(strtolower($response->getBody())); |
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$node = $crawler->filter('head > meta[http-equiv="x-pjax-version"]'); |
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if ($node->count()) { |
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$response = $response->withHeader('x-pjax-version', $node->attr('content')); |
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} |
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return $response; |
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} |
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/** |
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* @param Response $response |
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* |
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* @return bool |
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*/ |
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protected function isRedirectionResponse(Response $response) |
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{ |
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return $response->getStatusCode() >= 300 && $response->getStatusCode() < 400; |
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} |
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/** |
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* Get the DomCrawler instance. |
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* |
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* @param string $body |
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* |
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* @return \Symfony\Component\DomCrawler\Crawler |
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*/ |
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protected function getCrawler($body) |
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{ |
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if ($this->crawler) { |
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return $this->crawler; |
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} |
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return $this->crawler = new Crawler((string) $body); |
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} |
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} |
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slince /
cakephp-pjax
