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99 lines
3.7 KiB
99 lines
3.7 KiB
<?php |
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/** |
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* @file |
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* Theming for maintenance pages. |
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*/ |
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use Drupal\Core\Installer\InstallerKernel; |
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use Drupal\Core\Site\Settings; |
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/** |
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* Sets up the theming system for maintenance page. |
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* |
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* Used for site installs, updates and when the site is in maintenance mode. |
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* It also applies when the database is unavailable or bootstrap was not |
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* complete. Claro is always used for the initial install and update |
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* operations, but this can be overridden by setting a "maintenance_theme" key |
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* in the $settings variable in settings.php. |
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*/ |
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function _drupal_maintenance_theme(): void { |
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// If the theme is already set, assume the others are set too, and do nothing. |
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if (\Drupal::theme()->hasActiveTheme()) { |
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return; |
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} |
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require_once __DIR__ . '/theme.inc'; |
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require_once __DIR__ . '/common.inc'; |
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require_once __DIR__ . '/module.inc'; |
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// Install and update pages are treated differently to prevent theming |
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// overrides. |
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if (defined('MAINTENANCE_MODE') && (MAINTENANCE_MODE == 'install' || MAINTENANCE_MODE == 'update')) { |
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if (InstallerKernel::installationAttempted()) { |
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$custom_theme = $GLOBALS['install_state']['theme']; |
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} |
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else { |
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$custom_theme = Settings::get('maintenance_theme', 'claro'); |
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} |
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} |
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else { |
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// Use the maintenance theme if specified, otherwise attempt to use the |
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// default site theme. |
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try { |
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$custom_theme = Settings::get('maintenance_theme', ''); |
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if (!$custom_theme) { |
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$config = \Drupal::config('system.theme'); |
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$custom_theme = $config->get('default'); |
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} |
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} |
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catch (\Exception) { |
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// Whatever went wrong (often a database connection problem), we are |
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// about to fall back to a sensible theme so there is no need for special |
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// handling. |
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} |
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if (!$custom_theme) { |
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// We have been unable to identify the configured theme, so fall back to |
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// a safe default. Claro is reasonably user friendly and fairly generic. |
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$custom_theme = 'claro'; |
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} |
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} |
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$themes = \Drupal::service('theme_handler')->listInfo(); |
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// If no themes are installed yet, or if the requested custom theme is not |
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// installed, retrieve all available themes. |
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/** @var \Drupal\Core\Theme\ThemeInitialization $theme_init */ |
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$theme_init = \Drupal::service('theme.initialization'); |
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$theme_handler = \Drupal::service('theme_handler'); |
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if (empty($themes) || !isset($themes[$custom_theme])) { |
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$themes = \Drupal::service('extension.list.theme')->getList(); |
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$theme_handler->addTheme($themes[$custom_theme]); |
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} |
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// \Drupal\Core\Extension\ThemeHandlerInterface::listInfo() triggers a |
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// \Drupal\Core\Extension\ModuleHandler::alter() in maintenance mode, but we |
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// can't let themes alter the .info.yml data until we know a theme's base |
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// themes. So don't set active theme until after |
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// \Drupal\Core\Extension\ThemeHandlerInterface::listInfo() builds its cache. |
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$theme = $custom_theme; |
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// Find all our ancestor themes and put them in an array. |
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// @todo This is just a workaround. Find a better way how to handle themes |
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// on maintenance pages, see https://www.drupal.org/node/2322619. |
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// This code is basically a duplicate of |
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// \Drupal\Core\Theme\ThemeInitialization::getActiveThemeByName. |
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$base_themes = []; |
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$ancestor = $theme; |
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while ($ancestor && isset($themes[$ancestor]->base_theme)) { |
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$base_themes[] = $themes[$themes[$ancestor]->base_theme]; |
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$ancestor = $themes[$ancestor]->base_theme; |
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if ($ancestor) { |
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// Ensure that the base theme is added and installed. |
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$theme_handler->addTheme($themes[$ancestor]); |
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} |
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} |
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\Drupal::theme()->setActiveTheme($theme_init->getActiveTheme($themes[$custom_theme], $base_themes)); |
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// Prime the theme registry. |
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Drupal::service('theme.registry'); |
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}
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