function ConfigImportSubscriber::validateThemes

Validates theme installations and uninstallations.

Parameters

\Drupal\Core\Config\ConfigImporter $config_importer: The configuration importer.

File

core/lib/Drupal/Core/EventSubscriber/ConfigImportSubscriber.php, line 197

Class

ConfigImportSubscriber

Config import subscriber for config import events.

Namespace

Code

protected function validateThemes(ConfigImporter $config_importer) {
    $core_extension = $config_importer->getStorageComparer()
        ->getSourceStorage()
        ->read('core.extension');
    // Get all themes including those that are not installed.
    $theme_data = $this->getThemeData();
    $module_data = $this->moduleExtensionList
        ->getList();
    $nonexistent_themes = array_keys(array_diff_key($core_extension['theme'], $theme_data));
    foreach ($nonexistent_themes as $theme) {
        $config_importer->logError($this->t('Unable to install the %theme theme since it does not exist.', [
            '%theme' => $theme,
        ]));
    }
    // Ensure that all themes being installed have their dependencies met.
    $installs = $config_importer->getExtensionChangelist('theme', 'install');
    foreach ($installs as $theme) {
        $module_dependencies = $theme_data[$theme]->module_dependencies;
        // $theme_data[$theme]->requires contains both theme and module
        // dependencies keyed by the extension machine names.
        // $theme_data[$theme]->module_dependencies contains only the module
        // dependencies keyed by the module extension machine name. Therefore, we
        // can find the theme dependencies by finding array keys for 'requires'
        // that are not in $module_dependencies.
        $theme_dependencies = array_diff_key($theme_data[$theme]->requires, $module_dependencies);
        foreach (array_keys($theme_dependencies) as $required_theme) {
            if (!isset($core_extension['theme'][$required_theme])) {
                $theme_name = $theme_data[$theme]->info['name'];
                $required_theme_name = $theme_data[$required_theme]->info['name'];
                $config_importer->logError($this->t('Unable to install the %theme theme since it requires the %required_theme theme.', [
                    '%theme' => $theme_name,
                    '%required_theme' => $required_theme_name,
                ]));
            }
        }
        foreach (array_keys($module_dependencies) as $required_module) {
            if (!isset($core_extension['module'][$required_module])) {
                $theme_name = $theme_data[$theme]->info['name'];
                $required_module_name = $module_data[$required_module]->info['name'];
                $config_importer->logError($this->t('Unable to install the %theme theme since it requires the %required_module module.', [
                    '%theme' => $theme_name,
                    '%required_module' => $required_module_name,
                ]));
            }
        }
    }
    // Ensure that all themes being uninstalled are not required by themes that
    // will be installed after the import.
    $uninstalls = $config_importer->getExtensionChangelist('theme', 'uninstall');
    foreach ($uninstalls as $theme) {
        foreach (array_keys($theme_data[$theme]->required_by) as $dependent_theme) {
            if ($theme_data[$dependent_theme]->status && !in_array($dependent_theme, $uninstalls, TRUE)) {
                $theme_name = $theme_data[$theme]->info['name'];
                $dependent_theme_name = $theme_data[$dependent_theme]->info['name'];
                $config_importer->logError($this->t('Unable to uninstall the %theme theme since the %dependent_theme theme is installed.', [
                    '%theme' => $theme_name,
                    '%dependent_theme' => $dependent_theme_name,
                ]));
            }
        }
    }
}