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A PHP package to redact array values by their keys.
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README.md

A PHP package to redact an array's values by their keys no matter how deep the array.

Why?

Have you ever built or interacted with an api and needed to log all outgoing and incoming calls? Chances are that somewhere in that process is an authentication, either by an app or on behalf of a user. Logs are useful for debugging, but storing sensitive information such as passwords or api keys is not something you want to have in your logs for anyone to see. The usage goes beyond just this example, but that is what prompted me to create the ArrayRedactor package.

Whatever your usage needs may be, this package aims to provide a dead-simple, lightweight way to censor sensitive information in an array no matter how deeply it is nested.

Installation

Install via composer:

composer require mtownsend/array-redactor

This package is designed to work with any PHP 5.6+ application but has special Facade support for Laravel.

Registering the service provider (Laravel users)

For Laravel 5.4 and lower, add the following line to your config/app.php:

/*
 * Package Service Providers...
 */
Mtownsend\ArrayRedactor\Providers\ArrayRedactorServiceProvider::class,

For Laravel 5.5 and greater, the package will auto register the provider for you.

Using Lumen

To register the service provider, add the following line to app/bootstrap/app.php:

$app->register(Mtownsend\ArrayRedactor\Providers\ArrayRedactorServiceProvider::class);

Publishing the config file (Laravel users)

php artisan vendor:publish --provider="Mtownsend\ArrayRedactor\Providers\ArrayRedactorServiceProvider"

Once your arrayredactor.php has been published to your config folder, you will see a file with 2 keys in it: keys and ink. You can replace these values with anything you want, but please note: these values will only be applied when using the Laravel Facade.

Quick start

Using the class

use Mtownsend\ArrayRedactor\ArrayRedactor;

// An example array, maybe a request being made to/from an API application you wish to log in your database
$login = [
    'email' => 'john_doe@domain.com',
    'password' => 'secret123',
    'data' => [
        'session_id' => 'z481jf0an4kasnc8a84aj831'
    ],
];

$redactor = (new ArrayRedactor($login, ['password', 'session_id']))->redact();

// $redactor will return:
[
    'email' => 'john_doe@domain.com',
    'password' => '[REDACTED]',
    'data' => [
        'session_id' => '[REDACTED]'
    ],
];

Advanced usage

Array Redactor can also receive valid json instead of an array of content.

$json = json_encode([
    'email' => 'john_doe@domain.com',
    'password' => 'secret123',
    'data' => [
        'session_id' => 'z481jf0an4kasnc8a84aj831'
    ],
]);

$redactor = (new ArrayRedactor($json, ['password', 'session_id']))->redact();

// $redactor will return:
[
    'email' => 'john_doe@domain.com',
    'password' => '[REDACTED]',
    'data' => [
        'session_id' => '[REDACTED]'
    ],
];

You can also receive your content back as json instead of an array.

$login = [
    'email' => 'john_doe@domain.com',
    'password' => 'secret123',
    'data' => [
        'session_id' => 'z481jf0an4kasnc8a84aj831'
    ],
];

$redactor = (new ArrayRedactor($login, ['password', 'session_id']))->redactToJson();

// $redactor will return:
"{
	"email": "john_doe@domain.com",
	"password": "[REDACTED]",
	"data": {
		"session_id": "[REDACTED]"
	}
}"

You can change the redaction value (default: [REDACTED]), known as the ink, by passing it as the third argument of the constructor, or using the dedicated ->ink() method.

$login = [
    'email' => 'john_doe@domain.com',
    'password' => 'secret123',
    'data' => [
        'session_id' => 'z481jf0an4kasnc8a84aj831'
    ],
];

$redactor = (new ArrayRedactor($login, ['password', 'session_id'], null))->redact();
// or...
$redactor = (new ArrayRedactor($login, ['password', 'session_id']))->ink(null)->redact();

// $redactor will return:
[
    'email' => 'john_doe@domain.com',
    'password' => null,
    'data' => [
        'session_id' => null
    ],
];

You can call the ArrayRedactor as a function and the magic __invoke() method will call the redact method for you.

$login = [
    'email' => 'john_doe@domain.com',
    'password' => 'secret123',
    'data' => [
        'session_id' => 'z481jf0an4kasnc8a84aj831'
    ],
];

$redactor = (new ArrayRedactor($login, ['password', 'session_id'], null))();

// $redactor will return:
[
    'email' => 'john_doe@domain.com',
    'password' => null,
    'data' => [
        'session_id' => null
    ],
];

Lastly, you can skip the constructor arguments entirely if you prefer.

$login = [
    'email' => 'john_doe@domain.com',
    'password' => 'secret123',
    'data' => [
        'session_id' => 'z481jf0an4kasnc8a84aj831'
    ],
];

$redactor = (new ArrayRedactor)->content($login)->keys(['password'])->ink(null)->redact();

// $redactor will return:
[
    'email' => 'john_doe@domain.com',
    'password' => null,
    'data' => [
        'session_id' => 'z481jf0an4kasnc8a84aj831'
    ],
];

Using the global helper

This package provides a convenient helper function which is globally accessible.

array_redactor($array, $keys, $ink)->redact();
// or...
array_redactor()->content($array)->keys(['current_password', 'new_password'])->ink('████████')->redact();

Using the facade (Laravel users)

If you are using Laravel, this package provides a facade. To register the facade add the following line to your config/app.php under the aliases key.

Please note: this is the only method for Laravel users that will prefill your keys and ink from your arrayredactor.php config file. The global helper and direct instantiation of the class will not prefill these values for you.

'ArrayRedactor' => Mtownsend\ArrayRedactor\Facades\ArrayRedactor::class,
use ArrayRedactor;

// Laravel prefills our keys() and ink() methods for us from the config file
ArrayRedactor::content($array)->redact();

Error handling

In the event you pass content that is not valid json or an array, an ArrayRedactorException will be thrown.

try {
    $redactor = (new ArrayRedactor('i am an invalid argument', ['password']))->redact();
} catch (\Mtownsend\ArrayRedactor\Exceptions\ArrayRedactorException $exception) {
    // do something...
}

Credits

Testing

You can run the tests with:

./vendor/bin/phpunit

License

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

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