function system_page_attachments

Implements hook_page_attachments().

See also

template_preprocess_maintenance_page()

\Drupal\Core\EventSubscriber\ActiveLinkResponseFilter

File

core/modules/system/system.module, line 592

Code

function system_page_attachments(array &$page) {
    // Ensure the same CSS is loaded in template_preprocess_maintenance_page().
    $page['#attached']['library'][] = 'system/base';
    if (\Drupal::service('router.admin_context')->isAdminRoute()) {
        $page['#attached']['library'][] = 'system/admin';
    }
    // Attach libraries used by this theme.
    $active_theme = \Drupal::theme()->getActiveTheme();
    foreach ($active_theme->getLibraries() as $library) {
        $page['#attached']['library'][] = $library;
    }
    // Attach favicon.
    if (theme_get_setting('features.favicon')) {
        $favicon = theme_get_setting('favicon.url');
        $type = theme_get_setting('favicon.mimetype');
        $page['#attached']['html_head_link'][][] = [
            'rel' => 'icon',
            'href' => UrlHelper::stripDangerousProtocols($favicon),
            'type' => $type,
        ];
    }
    // Get the major Drupal version.
    [
        $version,
    ] = explode('.', \Drupal::VERSION);
    // Attach default meta tags.
    $meta_default = [
        // Make sure the Content-Type comes first because the IE browser may be
        // vulnerable to XSS via encoding attacks from any content that comes
        // before this META tag, such as a TITLE tag.
'system_meta_content_type' => [
            '#tag' => 'meta',
            '#attributes' => [
                'charset' => 'utf-8',
            ],
            // Security: This always has to be output first.
'#weight' => -1000,
        ],
        // Show Drupal and the major version number in the META GENERATOR tag.
'system_meta_generator' => [
            '#type' => 'html_tag',
            '#tag' => 'meta',
            '#attributes' => [
                'name' => 'Generator',
                'content' => 'Drupal ' . $version . ' (https://www.drupal.org)',
            ],
        ],
        // Attach default mobile meta tags for responsive design.
'MobileOptimized' => [
            '#tag' => 'meta',
            '#attributes' => [
                'name' => 'MobileOptimized',
                'content' => 'width',
            ],
        ],
        'HandheldFriendly' => [
            '#tag' => 'meta',
            '#attributes' => [
                'name' => 'HandheldFriendly',
                'content' => 'true',
            ],
        ],
        'viewport' => [
            '#tag' => 'meta',
            '#attributes' => [
                'name' => 'viewport',
                'content' => 'width=device-width, initial-scale=1.0',
            ],
        ],
    ];
    foreach ($meta_default as $key => $value) {
        $page['#attached']['html_head'][] = [
            $value,
            $key,
        ];
    }
    // Handle setting the "active" class on links by:
    // - loading the active-link library if the current user is authenticated;
    // - applying a response filter if the current user is anonymous.
    // @see \Drupal\Core\Link
    // @see \Drupal\Core\Utility\LinkGenerator::generate()
    // @see template_preprocess_links()
    // @see \Drupal\Core\EventSubscriber\ActiveLinkResponseFilter
    $page['#cache']['contexts'][] = 'user.roles:authenticated';
    if (\Drupal::currentUser()->isAuthenticated()) {
        $page['#attached']['library'][] = 'core/drupal.active-link';
    }
}