Devmatic\InstantClick\Middleware\FilterIfInstantClick

Complexity

Total Complexity

12

Size/Duplication

Total Lines	124
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	4

7 Methods

Rating	Name	Duplication	Size	Complexity
A	handle()	0	13	3
A	filterResponse()	0	11	1
A	makeTitle()	0	10	2
A	fetchContainer()	0	10	2
A	getCrawler()	0	8	2
A	isInstantClickRequest()	0	4	1
A	setResponseHeader()	0	6	1

<?php

namespace Devmatic\InstantClick\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Symfony\Component\DomCrawler\Crawler;

class FilterIfInstantClick
{
    /**
     * The DomCrawler instance.
     *
     * @var \Symfony\Component\DomCrawler\Crawler
     */
    protected $crawler;

    /**
     * Handle an incoming request.
     *
     * @param \Illuminate\Http\Request $request
     * @param \Closure                 $next
     *
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {
        $response = $next($request);

        if (!$this->isInstantClickRequest($request) || $response->isRedirection()) {
            return $response;
        }

        $this->filterResponse($response, $container = 'body')
            ->setResponseHeader($response);

        return $response;
    }

    /**
     * @param \Illuminate\Http\Response $response
     * @param string                    $container
     *
     * @return $this
     */
    protected function filterResponse(Response $response, $container)
    {
        $crawler = $this->getCrawler($response);

        $response->setContent(
            $this->makeTitle($crawler) .
            $this->fetchContainer($crawler, $container)
        );

        return $this;
    }

    /**
     * @param \Symfony\Component\DomCrawler\Crawler $crawler
     *
     * @return null|string
     */
    protected function makeTitle(Crawler $crawler)
    {
        $pageTitle = $crawler->filter('head > title');

        if (!$pageTitle->count()) {
            return;
        }

        return "<title>{$pageTitle->html()}</title>";
    }

    /**
     * @param \Symfony\Component\DomCrawler\Crawler $crawler
     * @param string                                $container
     *
     * @return string
     */
    protected function fetchContainer(Crawler $crawler, $container)
    {
        $content = $crawler->filter($container);

        if (!$content->count()) {
            abort(422);
        }

        return $content->html();
    }

    /**
     * Get the DomCrawler instance.
     *
     * @param \Illuminate\Http\Response $response
     *
     * @return \Symfony\Component\DomCrawler\Crawler
     */
    protected function getCrawler(Response $response)
    {
        if ($this->crawler) {
            return $this->crawler;
        }

        return $this->crawler = new Crawler($response->getContent());
    }


    /**
     * Determine if the request is the result of an InstantClick call.
     *
     * @return bool
     */
    public function isInstantClickRequest(Request $request)
    {
        return $request->headers->get('X-INSTANTCLICK') == true;
    }

    /**
     * @param \Illuminate\Http\Response $response
     *
     * @return $this
     * @internal param \Illuminate\Http\Request $request
     *
     */
    protected function setResponseHeader(Response $response)
    {
        $response->header('X-INSTANTCLICK', "true");

        return $this;
    }

}