RequiredModuleUninstallValidator.php

<?php

namespace Drupal\Core\Extension;

use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\Core\StringTranslation\TranslationInterface;

/**
 * Ensures that required modules cannot be uninstalled.
 */
class RequiredModuleUninstallValidator implements ModuleUninstallValidatorInterface {
    use StringTranslationTrait;
    
    /**
     * The module extension list.
     *
     * @var \Drupal\Core\Extension\ModuleExtensionList
     */
    protected $moduleExtensionList;
    
    /**
     * Constructs a new RequiredModuleUninstallValidator.
     *
     * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
     *   The string translation service.
     * @param \Drupal\Core\Extension\ModuleExtensionList $extension_list_module
     *   The module extension list.
     */
    public function __construct(TranslationInterface $string_translation, ModuleExtensionList $extension_list_module) {
        $this->stringTranslation = $string_translation;
        $this->moduleExtensionList = $extension_list_module;
    }
    
    /**
     * {@inheritdoc}
     */
    public function validate($module) {
        $reasons = [];
        $module_info = $this->getModuleInfoByModule($module);
        if (!empty($module_info['required'])) {
            $reasons[] = $this->t('The @module module is required', [
                '@module' => $module_info['name'],
            ]);
        }
        return $reasons;
    }
    
    /**
     * Returns the module info for a specific module.
     *
     * @param string $module
     *   The name of the module.
     *
     * @return array
     *   The module info, or empty array if that module does not exist.
     */
    protected function getModuleInfoByModule($module) {
        if ($this->moduleExtensionList
            ->exists($module)) {
            return $this->moduleExtensionList
                ->get($module)->info;
        }
        return [];
    }

}