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CRAP
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RegistrationModule
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 __construct($userRepository, $userValidator, $passwordHasher, $passwordGenerator)
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 registerLocalUser($email, $password)
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 registerExternalUser($email, $type)
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 registerUser($email, $password, $type)
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<?php
namespace Tdd;
class RegistrationModule
{
    /** @var UserValidator */
    private $userValidator;
    /** @var UserRepository */
    private $userRepository;
    /** @var PasswordHasher */
    private $passwordHasher;
    /** @var PasswordGenerator */
    private $passwordGenerator;
    public function __construct($userRepository, $userValidator, $passwordHasher, $passwordGenerator)
    {
        $this->userRepository    = $userRepository;
        $this->userValidator     = $userValidator;
        $this->passwordHasher    = $passwordHasher;
        $this->passwordGenerator = $passwordGenerator;
    }
    public function registerLocalUser($email, $password)
    {
        return $this->registerUser($email, $password, 'local');
    }
    public function registerExternalUser($email, $type)
    {
        return $this->registerUser($email, $this->passwordGenerator->generate(), $type);
    }
    private function registerUser($email, $password, $type)
    {
        $rawUser = new User($email, $password, $type);
        if (!$this->userValidator->isValid($rawUser))
        {
            throw new \InvalidArgumentException('User details are invalid!');
        }
        $encodedUser = new User($email, $this->passwordHasher->hash($password), $type);
        return $this->userRepository->save($encodedUser);
    }
}