ThemeValidator.php

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<?php
namespace Magento\Theme\Model;

use Magento\Framework\App\Config\ValueInterface;
use Magento\Framework\View\Design\Theme\ThemeProviderInterface;
use Magento\Framework\View\DesignInterface;
use Magento\Store\Model\ScopeInterface;
use Magento\Store\Model\StoreManagerInterface;

class ThemeValidator
{

    private $storeManager;

    private $themeProvider;

    private $configData;

    public function __construct(
        StoreManagerInterface $storeManager,
        ThemeProviderInterface $themeProvider,
        ValueInterface $configData
    ) {
        $this->storeManager = $storeManager;
        $this->themeProvider = $themeProvider;
        $this->configData = $configData;
    }

    public function validateIsThemeInUse($themePaths)
    {
        $messages = [];
        $themesById = [];
        foreach ($themePaths as $themePath) {
            $theme = $this->themeProvider->getThemeByFullPath($themePath);
            $themesById[$theme->getId()] = $themePath;
        }
        $configData = $this->configData
            ->getCollection()
            ->addFieldToFilter('path', DesignInterface::XML_PATH_THEME_ID)
            ->addFieldToFilter('value', ['in' => array_keys($themesById)]);
        foreach ($configData as $row) {
            switch ($row['scope']) {
                case 'default':
                    $messages[] = '<error>' . $themesById[$row['value']] . ' is in use in default config' . '</error>';
                    break;
                case ScopeInterface::SCOPE_WEBSITES:
                    $messages[] = '<error>' . $themesById[$row['value']] . ' is in use in website '
                        . $this->storeManager->getWebsite($row['scope_id'])->getName() . '</error>';
                    break;
                case ScopeInterface::SCOPE_STORES:
                    $messages[] = '<error>' . $themesById[$row['value']] . ' is in use in store '
                        . $this->storeManager->getStore($row['scope_id'])->getName() . '</error>';
                    break;
            }
        }
        return $messages;
    }
}