magento2/app/code/Magento/SampleData/Model/Dependency.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\SampleData\Model;

use Magento\Framework\App\ObjectManager;
use Magento\Framework\Component\ComponentRegistrar;
use Magento\Framework\Component\ComponentRegistrarInterface;
use Magento\Framework\Composer\ComposerInformation;
use Magento\Framework\Config\Composer\Package;
use Magento\Framework\Config\Composer\PackageFactory;
use Magento\Framework\Filesystem;
use Magento\Framework\Filesystem\Directory\ReadFactory;

/**
 * Sample Data dependency
 */
class Dependency
{
    /**
     * Sample data version text
     */
    public const SAMPLE_DATA_SUGGEST = 'Sample Data version:';

    /**
     * @var ComposerInformation
     */
    protected $composerInformation;

    /**
     * @var PackageFactory
     */
    private $packageFactory;

    /**
     * @var ComponentRegistrarInterface
     */
    private $componentRegistrar;

    /**
     * @var ReadFactory
     */
    private $directoryReadFactory;

    /**
     * Initialize dependencies.
     *
     * @param ComposerInformation $composerInformation
     * @param Filesystem $filesystem @deprecated 2.3.0 $directoryReadFactory is used instead
     * @param PackageFactory $packageFactory
     * @param ComponentRegistrarInterface $componentRegistrar
     * @param Filesystem\Directory\ReadFactory|null $directoryReadFactory
     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
     */
    public function __construct(
        ComposerInformation $composerInformation,
        Filesystem $filesystem,
        PackageFactory $packageFactory,
        ComponentRegistrarInterface $componentRegistrar,
        \Magento\Framework\Filesystem\Directory\ReadFactory $directoryReadFactory = null
    ) {
        $this->composerInformation = $composerInformation;
        $this->packageFactory = $packageFactory;
        $this->componentRegistrar = $componentRegistrar;
        $this->directoryReadFactory = $directoryReadFactory ?:
            ObjectManager::getInstance()->get(ReadFactory::class);
    }

    /**
     * Retrieve list of sample data packages from suggests
     *
     * @return array
     * @throws \Magento\Framework\Exception\FileSystemException
     */
    public function getSampleDataPackages()
    {
        $installExtensions = [];
        $suggests = $this->composerInformation->getSuggestedPackages();
        $suggests = array_merge($suggests, $this->getSuggestsFromModules());
        foreach ($suggests as $name => $version) {
            if ($version !== null && strpos($version, self::SAMPLE_DATA_SUGGEST) === 0) {
                $installExtensions[$name] = trim(substr($version, strlen(self::SAMPLE_DATA_SUGGEST)));
            }
        }
        return $installExtensions;
    }

    /**
     * Retrieve suggested sample data packages from modules composer.json
     *
     * @return array
     * @throws \Magento\Framework\Exception\FileSystemException
     */
    protected function getSuggestsFromModules()
    {
        $suggests = [];
        foreach ($this->componentRegistrar->getPaths(ComponentRegistrar::MODULE) as $moduleDir) {
            $package = $this->getModuleComposerPackage($moduleDir);
            $suggest = json_decode(json_encode($package->get('suggest')), true);
            if (!empty($suggest)) {
                $suggests += $suggest;
            }
        }
        return $suggests;
    }

    /**
     * Load package
     *
     * @param string $moduleDir
     * @return Package
     * @throws \Magento\Framework\Exception\FileSystemException
     */
    private function getModuleComposerPackage($moduleDir)
    {
        /*
         * Also look in parent directory of registered module directory to allow modules to follow the pds/skeleton
         * standard and have their source code in a "src" subdirectory of the repository
         *
         * see: https://github.com/php-pds/skeleton
         */
        foreach ([$moduleDir, $moduleDir . DIRECTORY_SEPARATOR . '..'] as $dir) {
            /** @var Filesystem\Directory\ReadInterface $directory */
            $directory = $this->directoryReadFactory->create($dir);
            if ($directory->isExist('composer.json') && $directory->isReadable('composer.json')) {
                /** @var Package $package */
                return $this->packageFactory->create(['json' => json_decode($directory->readFile('composer.json'))]);
            }
        }
        return $this->packageFactory->create(['json' => new \stdClass]);
    }
}