<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\PasswordHasher\Command;

use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Exception\InvalidArgumentException;
use Symfony\Component\Console\Exception\RuntimeException;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\ConsoleOutputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Question\Question;
use Symfony\Component\Console\Style\SymfonyStyle;
use Symfony\Component\PasswordHasher\Hasher\PasswordHasherFactoryInterface;
use Symfony\Component\PasswordHasher\LegacyPasswordHasherInterface;

/**
 * Hashes a user's password.
 *
 * @author Sarah Khalil <mkhalil.sarah@gmail.com>
 * @author Robin Chalas <robin.chalas@gmail.com>
 *
 * @final
 */
class UserPasswordHashCommand extends Command
{
    protected static $defaultName = 'security:hash-password';
    protected static $defaultDescription = 'Hash a user password';

    private $hasherFactory;
    private $userClasses;

    public function __construct(PasswordHasherFactoryInterface $hasherFactory, array $userClasses = [])
    {
        $this->hasherFactory = $hasherFactory;
        $this->userClasses = $userClasses;

        parent::__construct();
    }

    /**
     * {@inheritdoc}
     */
    protected function configure()
    {
        $this
            ->setDescription(self::$defaultDescription)
            ->addArgument('password', InputArgument::OPTIONAL, 'The plain password to hash.')
            ->addArgument('user-class', InputArgument::OPTIONAL, 'The User entity class path associated with the hasher used to hash the password.')
            ->addOption('empty-salt', null, InputOption::VALUE_NONE, 'Do not generate a salt or let the hasher generate one.')
            ->setHelp(<<<EOF

The <info>%command.name%</info> command hashes passwords according to your
security configuration. This command is mainly used to generate passwords for
the <comment>in_memory</comment> user provider type and for changing passwords
in the database while developing the application.

Suppose that you have the following security configuration in your application:

<comment>
# app/config/security.yml
security:
    password_hashers:
        Symfony\Component\Security\Core\User\InMemoryUser: plaintext
        App\Entity\User: auto
</comment>

If you execute the command non-interactively, the first available configured
user class under the <comment>security.password_hashers</comment> key is used and a random salt is
generated to hash the password:

  <info>php %command.full_name% --no-interaction [password]</info>

Pass the full user class path as the second argument to hash passwords for
your own entities:

  <info>php %command.full_name% --no-interaction [password] 'App\Entity\User'</info>

Executing the command interactively allows you to generate a random salt for
hashing the password:

  <info>php %command.full_name% [password] 'App\Entity\User'</info>

In case your hasher doesn't require a salt, add the <comment>empty-salt</comment> option:

  <info>php %command.full_name% --empty-salt [password] 'App\Entity\User'</info>

EOF
            )
        ;
    }

    /**
     * {@inheritdoc}
     */
    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        $io = new SymfonyStyle($input, $output);
        $errorIo = $output instanceof ConsoleOutputInterface ? new SymfonyStyle($input, $output->getErrorOutput()) : $io;

        $input->isInteractive() ? $errorIo->title('Symfony Password Hash Utility') : $errorIo->newLine();

        $password = $input->getArgument('password');
        $userClass = $this->getUserClass($input, $io);
        $emptySalt = $input->getOption('empty-salt');

        $hasher = $this->hasherFactory->getPasswordHasher($userClass);
        $saltlessWithoutEmptySalt = !$emptySalt && !$hasher instanceof LegacyPasswordHasherInterface;

        if ($saltlessWithoutEmptySalt) {
            $emptySalt = true;
        }

        if (!$password) {
            if (!$input->isInteractive()) {
                $errorIo->error('The password must not be empty.');

                return 1;
            }
            $passwordQuestion = $this->createPasswordQuestion();
            $password = $errorIo->askQuestion($passwordQuestion);
        }

        $salt = null;

        if ($input->isInteractive() && !$emptySalt) {
            $emptySalt = true;

            $errorIo->note('The command will take care of generating a salt for you. Be aware that some hashers advise to let them generate their own salt. If you\'re using one of those hashers, please answer \'no\' to the question below. '.\PHP_EOL.'Provide the \'empty-salt\' option in order to let the hasher handle the generation itself.');

            if ($errorIo->confirm('Confirm salt generation ?')) {
                $salt = $this->generateSalt();
                $emptySalt = false;
            }
        } elseif (!$emptySalt) {
            $salt = $this->generateSalt();
        }

        $hashedPassword = $hasher->hash($password, $salt);

        $rows = [
            ['Hasher used', \get_class($hasher)],
            ['Password hash', $hashedPassword],
        ];
        if (!$emptySalt) {
            $rows[] = ['Generated salt', $salt];
        }
        $io->table(['Key', 'Value'], $rows);

        if (!$emptySalt) {
            $errorIo->note(sprintf('Make sure that your salt storage field fits the salt length: %s chars', \strlen($salt)));
        } elseif ($saltlessWithoutEmptySalt) {
            $errorIo->note('Self-salting hasher used: the hasher generated its own built-in salt.');
        }

        $errorIo->success('Password hashing succeeded');

        return 0;
    }

    /**
     * Create the password question to ask the user for the password to be hashed.
     */
    private function createPasswordQuestion(): Question
    {
        $passwordQuestion = new Question('Type in your password to be hashed');

        return $passwordQuestion->setValidator(function ($value) {
            if ('' === trim($value)) {
                throw new InvalidArgumentException('The password must not be empty.');
            }

            return $value;
        })->setHidden(true)->setMaxAttempts(20);
    }

    private function generateSalt(): string
    {
        return base64_encode(random_bytes(30));
    }

    private function getUserClass(InputInterface $input, SymfonyStyle $io): string
    {
        if (null !== $userClass = $input->getArgument('user-class')) {
            return $userClass;
        }

        if (!$this->userClasses) {
            throw new RuntimeException('There are no configured password hashers for the "security" extension.');
        }

        if (!$input->isInteractive() || 1 === \count($this->userClasses)) {
            return reset($this->userClasses);
        }

        $userClasses = $this->userClasses;
        natcasesort($userClasses);
        $userClasses = array_values($userClasses);

        return $io->choice('For which user class would you like to hash a password?', $userClasses, reset($userClasses));
    }
}
