Leaf CSRF #

This package is leaf's implementation of CSRF default protection with leaf anchor. It comes separated from leaf anchor because it is not needed in every project you may build.

Installation #

You can easily install Leaf CSRF using Composer.

composer require leafs/csrf

or with leaf CLI

leaf install csrf

Basic Usage #

After installing leaf CSRF, leaf automatically loads the CSRF package for you, so you don't need to do anything unless you want to configure the CSRF module to match your application requirements.

Using CSRF outside of leaf #

Most leaf modules can be used outside of leaf. This module is one of these global modules. If you decide to use the CSRF module outside of leaf, you will need to manually initialize the package.

Leaf\Anchor\CSRF::init();

This function generates a token with a secret and a random hash and saves that in a session. If no session exists, the CSRF module will create a session for your app and save the token in that session,

Config #

Just like every other leaf module, this module also allows you to customize it to behave in any way you want it to behave. Also, since this module is built on the Anchor module, the config object is shared with Anchor. To set any configuration, simply call the config method.

Available config:

• SECRET_KEY - This is the key with which the token is saved and used in your leaf app. If this is not specified, leaf uses the name _token as done in other frameworks like Laravel.

• SECRET - This is the secret key used to encrypt the token. Leaf also has a default secret key set for you. Note that the secret key is attached to a set of unique numbers that not even leaf knows.

• EXCEPT - This is an array of routes that you want to exclude from the CSRF protection.

• METHODS - This is an array of HTTP methods to apply CSRF protection to. By default, leaf uses ["POST", "PUT", "PATCH", "DELETE"]

use Leaf\Anchor\CSRF;

CSRF::config([
  "METHODS" => ["GET"],
  "EXCEPT" => ["/"],
]);

Token #

A token is generated under the hood for your application, you can get this token to submit in forms using the token method.

$csrfToken = Leaf\Anchor\CSRF::token();

>> ["_token" => "TOKEN VALUE"]

To make things a bit easier, token returns associative array holding the token key name and the token itself. This is an example JSON represenation.

{"_token": "TOKEN VALUE"}

Form #

You would usually want to append a hidden input field holding the token to a form so it doesn't fail the CSRF check. Although you can use the token method above to do just that, the form method makes it a lot easier as it renders the input field and populates it with the token.

<form ...>
  <?php Leaf\Anchor\CSRF::form(); ?>
  ...
</form>

Functional Mode #

Just as with other modules, leaf csrf also ships with global functions that make development a lot easier.

_token #

This method returns the CSRF token just as done with the token method above.

$csrfToken = _token();

>> ["_token" => "TOKEN VALUE"]

_csrfField #

This directly renders the form field for the CSRF token generated.

<form ...>
  <?php _csrfField(); ?>
  ...
</form>