Laravel 5.x middleware to verify an SNS request came from Amazon.

VerifySnsMessageCameFromAmazon.php

<?php

namespace App\Http\Middleware;

use Aws\Sns\Message;
use Aws\Sns\MessageValidator;
use Closure;

class VerifySnsMessageCameFromAmazon
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        (new MessageValidator)->validate(Message::createFromRawPostData());

        return $next($request);
    }
}