CORS Middleware File for Laravel/Lumen

CorsMiddleware.php

<?php
declare(strict_types = 1);

/**
 * @author Oladapo Omonayajo <[email protected]>
 * Created on 3/27/2017, 18:21
 */

namespace App\Http\Middleware;

class CorsMiddleware
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, \Closure $next)
    {
        $referrer = $_SERVER['HTTP_REFERER'] ?? '';
        $referrer = substr($referrer, 0, strlen($referrer) - 1);
        $headers = [
            'Access-Control-Allow-Origin'      => $referrer,
            'Access-Control-Allow-Methods'     => 'POST, GET, OPTIONS, PUT, DELETE',
            'Access-Control-Allow-Credentials' => 'true',
            'Access-Control-Max-Age'           => '86400',
            'Access-Control-Allow-Headers'     => 'Content-Type, Authorization, X-Requested-With'
        ];

        if ($request->isMethod('OPTIONS')) {
            return response()->json(['method' => 'OPTIONS' ], 200, $headers);
        }

        $response = $next($request);
        foreach ($headers as $key => $value) {
            $response->headers->set($key, $value);
        }

        return $response;
    }
}