ebln/phpstan-factory-rule

Enforce that your classes get only instantiated by the factories you define!

Usage with support for attributes

Require this package: composer require --dev ebln/phpstan-factory-rule

Add the ForceFactory attribute to your class, and supply all class names as arguments, which shall be allowed to instanciate your object.

<?php
// […]

#[\Ebln\Attrib\ForceFactory(GoodFactory::class, BetterFactory::class)]
class OnlyViaFactory
{
}

Now lean back and rely on PHPStan in CI pipelines, git hooks or IDE integrations; If somebody introduces a rogue factory:

<?php
// […]

class FailingFactory
{
    public function create(): OnlyViaFactory
    {   
        return new OnlyViaFactory();
    }
}

…that is supposed to fail, when you run PHPStan.

Deprecated usage with ebln/phpstan-factory-mark

Require this extention and the package containing the marking interface via Composer alongside with PHPStan:

composer require ebln/phpstan-factory-mark
composer require --dev ebln/phpstan-factory-rule

Implement \Ebln\PHPStan\EnforceFactory\ForceFactoryInterface with the DTO you want to protect.

<?php
// […]
use Ebln\PHPStan\EnforceFactory\ForceFactoryInterface;

class OnlyViaFactory implements ForceFactoryInterface
{
    // […]
    public static function getFactories(): array
    {   // Return a list of classes that are allowed to
        //   create new OnlyViaFactory instances…
        return [TheOnlyTrueFactory::class];
    }
}

Now rely on PHPStan in CI pipelines, git hooks or IDE integrations.

If somebody introduces a rogue factory:

<?php
// […]

class FailingFactory
{
    public function create(): OnlyViaFactory
    {   
        return new OnlyViaFactory();
    }
}

…that is supposed to fail, when you run PHPStan.

Installation

Require this extention via Composer:

composer require --dev ebln/phpstan-factory-rule

If you also install phpstan/extension-installer then you're all set!

Manual installation

If you don't want to use phpstan/extension-installer, just specify the rule in your project's PHPStan config:

rules:
    - \Ebln\PHPStan\EnforceFactory\ForceFactoryRule