firefly-iii/app/Http/Middleware/SecureHeaders.php

<?php
/**
 * SecureHeaders.php
 * Copyright (c) 2018 thegrumpydictator@gmail.com
 *
 * This file is part of Firefly III.
 *
 * Firefly III is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Firefly III 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Firefly III. If not, see <http://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace FireflyIII\Http\Middleware;

use Closure;
use Illuminate\Http\Request;

/**
 *
 * Class SecureHeaders
 */
class SecureHeaders
{
    /**
     * Handle an incoming request. May not be a limited user (ie. Sandstorm env. or demo user).
     *
     * @param \Illuminate\Http\Request $request
     * @param \Closure $next
     *
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {
        $response    = $next($request);
        $google      = '';
        $googleImg   = '';
        $analyticsId = config('firefly.analytics_id');
        if ('' !== $analyticsId) {
            $google    = 'www.googletagmanager.com/gtag/js https://www.google-analytics.com/analytics.js'; // @codeCoverageIgnore
            $googleImg = 'https://www.google-analytics.com/';
        }
        $csp = [
            "default-src 'none'",
            "object-src 'self'",
            sprintf("script-src 'self' 'unsafe-eval' 'unsafe-inline' %s", $google),
            "style-src 'self' 'unsafe-inline'",
            "base-uri 'self'",
            "font-src 'self' data:",
            "connect-src 'self'",
            sprintf("img-src 'self' data: https://api.tiles.mapbox.com %s", $googleImg),
            "manifest-src 'self'",
        ];

        $route = $request->route();
        if (null !== $route && 'oauth/authorize' !== $route->uri) {
            $csp[] = "form-action 'self'";
        }

        $featurePolicies = [
            "geolocation 'none'",
            "midi 'none'",
            //"notifications 'none'",
            //"push 'self'",
            "sync-xhr 'self'",
            "microphone 'none'",
            "camera 'none'",
            "magnetometer 'none'",
            "gyroscope 'none'",
            "speaker 'none'",
            //"vibrate 'none'",
            "fullscreen 'self'",
            "payment 'none'",
        ];

        $disableFrameHeader = config('firefly.disable_frame_header');
        if (false === $disableFrameHeader || null === $disableFrameHeader) {
            $response->header('X-Frame-Options', 'deny');
        }

        // content security policy may be set elsewhere.
        if (!$response->headers->has('Content-Security-Policy')) {
            $response->header('Content-Security-Policy', implode('; ', $csp));
        }
        $response->header('X-XSS-Protection', '1; mode=block');
        $response->header('X-Content-Type-Options', 'nosniff');
        $response->header('Referrer-Policy', 'no-referrer');
        $response->header('Feature-Policy', implode('; ', $featurePolicies));

        return $response;
    }
}