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Requires Slim 3 CSRF component

Basically, this package passes CSRF token to view (currently, official Slim Twig and PHP renderers are supported) or in response headers (for AJAX calls).

Installation

Requires Composer

composer require aurmil/slim3-csrf-utilities

Then require Composer autoload file

require 'vendor/autoload.php';

Usage

For an action that needs to display CSRF token in a view, add Aurmil\Slim\CsrfTokenToView middleware before Slim\Csrf\Guard.

For an AJAX called action that needs to return new token to the caller in response headers, add Aurmil\Slim\CsrfTokenToHeaders middleware before Slim\Csrf\Guard.

Let's consider a really light Slim app:

index.php

<?php
// declare usage of needed classes
use Aurmil\Slim\CsrfTokenToView;
use Aurmil\Slim\CsrfTokenToHeaders;

// Composer autoload file
require 'vendor/autoload.php';

// Needed by CSRF component to store token
session_start();

// Slim
$app = new \Slim\App();
$container = $app->getContainer();

// If a route needs a view renderer
$container['renderer'] = function ($c) {
    return new \Slim\Views\Twig(__DIR__, ['cache' => false]); // Twig
    return new \Slim\Views\PhpRenderer(__DIR__.'/'); // Or PHP
};

// CSRF component
$container['csrf'] = function ($c) {
    return new \Slim\Csrf\Guard;
};

// HTML form including fields for CSRF token
$app->get('/', function ($request, $response) {
    return $this->renderer->render($response, 'view.twig'); // Twig
    return $this->renderer->render($response, 'view.php'); // Or PHP
})->add(new CsrfTokenToView($container->csrf, $container->renderer))
    ->add($container->csrf);

// CSRF protected action, can be called by AJAX
$app->post('/submit', function ($request, $response) {
    if ($request->isXhr()) {
        return $response->withJson(['success' => true]);
    } else {
        return $response->withRedirect('/');
    }
})->add(new CsrfTokenToHeaders($container->csrf))
    ->add($container->csrf);

// Slim dispatching
$app->run();

Twig view

<!doctype html>
<html>
    <head>
        <meta charset="utf-8">
        <title>CSRF</title>
    </head>
    <body>
        <form action="/submit" method="post">
            {% if csrf_token is defined and csrf_token %}
                {% for key, value in csrf_token %}
            <input type="hidden" name="{{ key|e('html_attr') }}" value="{{ value|e('html_attr') }}" class="csrf">
                {% endfor %}
            {% endif %}

            <button type="submit">Submit</button>
        </form>

        <!-- for AJAX calls -->
        <script src="http://code.jquery.com/jquery-2.2.1.min.js"></script>
        <script src="main.js"></script>
    </body>
</html>

Or PHP view

<!doctype html>
<html>
    <head>
        <meta charset="utf-8">
        <title>CSRF</title>
    </head>
    <body>
        <form action="/submit" method="post">
            <?php if (isset($csrf_token) and !empty($csrf_token)): ?>
                <?php foreach ($csrf_token as $key => $value): ?>
            <input type="hidden" name="<?php echo $key ?>" value="<?php echo $value ?>" class="csrf">
                <?php endforeach ?>
            <?php endif ?>

            <button type="submit">Submit</button>
        </form>

        <!-- for AJAX calls -->
        <script src="http://code.jquery.com/jquery-2.2.1.min.js"></script>
        <script src="main.js"></script>
    </body>
</html>

JS file (fox AJAX calls) using jQuery

$(function () {
    var form = $('form');
    form.on('submit', function () {
        $.ajax({
            url: form.attr('action'),
            method: form.attr('method'),
            data: form.serialize(),
            cache: false,
            dataType: 'json',
            success: function (data) {
                console.log('OK');
            },
            error: function () {
                console.log('error')
            },
            complete: function (jqXHR) {
                var csrfToken = jqXHR.getResponseHeader('X-CSRF-Token');

                if (csrfToken) {
                    try {
                        csrfToken = $.parseJSON(csrfToken);
                        var csrfTokenKeys = Object.keys(csrfToken);
                        var hiddenFields = form.find('input.csrf[type="hidden"]');

                        if (csrfTokenKeys.length === hiddenFields.length) {
                            hiddenFields.each(function(i) {
                                $(this).attr('name', csrfTokenKeys[i]);
                                $(this).val(csrfToken[csrfTokenKeys[i]]);
                            });
                        }
                    } catch (e) {

                    }
                }
            }
        });

        return false;
    });
});

And .htaccess

<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^ index.php [QSA,L]
</IfModule>

License

The MIT License (MIT). Please see License File for more information.

aurmil/slim3-csrf-utilities

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