CacheFilter.php

<?php namespace Zofe\Filters;

/*
my customized version of jeff  class https://laracasts.com/lessons/caching-essentials
*/
use Illuminate\Routing\Route;
use Illuminate\Http\Request;
use Illuminate\Http\Response;

use Str;
use Cache;
use View;

/*
usage in filters: 
Route::group(array('before' =>'cache.fetch', 'after' => array('cache.put','cache.finish')), function()
{
..
}

usage in views:
<view source="path.to.uncached.view" />
*/


class CacheFilter {

    public function fetch(Route $route, Request $request)
    {
        $key = $this->makeCacheKey($request->url());

        if  (Cache::has($key)) return Cache::get($key);

    }

    public function put(Route $route, Request $request, Response $response)
    {
        $key = $this->makeCacheKey($request->url());

        if  (!Cache::has($key)){
            Cache::put($key, $response->getContent(), 5); //cache for n minutes
        }
    }

    public function finish(Route $route, Request $request, Response $response)
    {
        $content = $response->getContent();
        if (preg_match_all("#<view source=\"([A-Za-z0-9/_.-]+)\" \/>#iU", $content, $matches))
        {
            foreach (array_keys($matches[0]) as $id)
            {
                $view = $matches[1][$id];

                if (View::exists($view))
                {
                    $partial = (string)View::make($view);
                    $content = str_replace($matches[0][$id], $partial, $content);
                }
            }
        }

        $response->setContent($content);
    }

    protected function makeCacheKey($url)
    {
        return 'route_'.Str::slug($url);
    }


}