Pony.fm/app/Http/Middleware/VerifyCsrfHeader.php

<?php

/**
 * Pony.fm - A community for pony fan music.
 * Copyright (C) 2015 Peter Deltchev
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace Poniverse\Ponyfm\Http\Middleware;

use Closure;
use Illuminate\Session\TokenMismatchException;
use Session;

class VerifyCsrfHeader
{

    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request $request
     * @param  \Closure $next
     * @return mixed
     * @throws TokenMismatchException
     */
    public function handle($request, Closure $next)
    {
        if (Session::token() != $request->input('_token') && Session::token() != $request->header('X-Token')) {
            throw new TokenMismatchException;
        }

        return $next($request);
    }
}