AjaxResponseAttachmentsProcessor.php

<?php

namespace Drupal\advagg\Ajax;

use Drupal\Core\Ajax\AjaxResponse;
use Drupal\Core\Ajax\AjaxResponseAttachmentsProcessor as CoreAjaxResponseAttachmentsProcessor;
use Drupal\Core\Ajax\AddCssCommand;
use Drupal\Core\Ajax\AppendCommand;
use Drupal\Core\Ajax\PrependCommand;
use Drupal\Core\Ajax\SettingsCommand;
use Drupal\Core\Asset\AttachedAssets;
use Drupal\Core\Render\AttachmentsResponseProcessorInterface;
use Symfony\Component\HttpFoundation\Request;

/**
 * {@inheritdoc}
 */
class AjaxResponseAttachmentsProcessor extends CoreAjaxResponseAttachmentsProcessor implements AttachmentsResponseProcessorInterface {
    
    /**
     * {@inheritdoc}
     */
    protected function buildAttachmentsCommands(AjaxResponse $response, Request $request) {
        $ajax_page_state = $request->request
            ->get('ajax_page_state') ?: $request->query
            ->get('ajax_page_state');
        // Aggregate CSS/JS if necessary, but only during normal site operation.
        $optimize_css = !defined('MAINTENANCE_MODE') && $this->config
            ->get('css.preprocess');
        $optimize_js = !defined('MAINTENANCE_MODE') && $this->config
            ->get('js.preprocess');
        $attachments = $response->getAttachments();
        // Resolve the attached libraries into asset collections.
        $assets = new AttachedAssets();
        $assets->setLibraries(isset($attachments['library']) ? $attachments['library'] : [])
            ->setAlreadyLoadedLibraries(isset($ajax_page_state['libraries']) ? explode(',', $ajax_page_state['libraries']) : [])
            ->setSettings(isset($attachments['drupalSettings']) ? $attachments['drupalSettings'] : []);
        $css_assets = $this->assetResolver
            ->getCssAssets($assets, $optimize_css);
        list($js_assets_header, $js_assets_footer) = $this->assetResolver
            ->getJsAssets($assets, $optimize_js);
        // First, AttachedAssets::setLibraries() ensures duplicate libraries are
        // removed: it converts it to a set of libraries if necessary. Second,
        // AssetResolver::getJsSettings() ensures $assets contains the final set of
        // JavaScript settings. AttachmentsResponseProcessorInterface also mandates
        // that the response it processes contains the final attachment values, so
        // update both the 'library' and 'drupalSettings' attachments accordingly.
        $attachments['library'] = $assets->getLibraries();
        $attachments['drupalSettings'] = $assets->getSettings();
        $response->setAttachments($attachments);
        $alter_type = 'ajax';
        // Render the HTML to load these files, and add AJAX commands to insert this
        // HTML in the page. Settings are handled separately, afterwards.
        $settings = [];
        if (isset($js_assets_header['drupalSettings'])) {
            $settings = $js_assets_header['drupalSettings']['data'];
            unset($js_assets_header['drupalSettings']);
        }
        if (isset($js_assets_footer['drupalSettings'])) {
            $settings = $js_assets_footer['drupalSettings']['data'];
            unset($js_assets_footer['drupalSettings']);
        }
        // Prepend commands to add the assets, preserving their relative order.
        $resource_commands = [];
        $prefetch = [];
        if ($css_assets) {
            $css_render_array = $this->cssCollectionRenderer
                ->render($css_assets);
            if (isset($css_render_array['prefetch'])) {
                $prefetch = array_merge($prefetch, $css_render_array['prefetch']);
                unset($css_render_array['prefetch']);
            }
            // Allow other modules to alter the assets before rendering.
            // Call hook_advagg_asset_render_alter().
            $asset_type = 'css';
            $this->moduleHandler
                ->alter('advagg_asset_render', $css_render_array, $alter_type, $asset_type);
            $resource_commands[] = new AddCssCommand($this->renderer
                ->renderPlain($css_render_array));
        }
        if ($js_assets_header) {
            $js_header_render_array = $this->jsCollectionRenderer
                ->render($js_assets_header);
            if (isset($js_header_render_array['prefetch'])) {
                $prefetch = array_merge($prefetch, $js_header_render_array['prefetch']);
                unset($js_header_render_array['prefetch']);
            }
            // Allow other modules to alter the assets before rendering.
            // Call hook_advagg_asset_render_alter().
            $asset_type = 'js_header';
            $this->moduleHandler
                ->alter('advagg_asset_render', $js_header_render_array, $alter_type, $asset_type);
            $resource_commands[] = new PrependCommand('head', $this->renderer
                ->renderPlain($js_header_render_array));
        }
        if ($js_assets_footer) {
            $js_footer_render_array = $this->jsCollectionRenderer
                ->render($js_assets_footer);
            if (isset($js_footer_render_array['prefetch'])) {
                $prefetch = array_merge($prefetch, $js_footer_render_array['prefetch']);
                unset($js_footer_render_array['prefetch']);
            }
            // Allow other modules to alter the assets before rendering.
            // Call hook_advagg_asset_render_alter().
            $asset_type = 'js_footer';
            $this->moduleHandler
                ->alter('advagg_asset_render', $js_footer_render_array, $alter_type, $asset_type);
            $resource_commands[] = new AppendCommand('body', $this->renderer
                ->renderPlain($js_footer_render_array));
        }
        if ($prefetch) {
            $prefetch = array_unique($prefetch, SORT_REGULAR);
            // Allow other modules to alter the assets before rendering.
            // Call hook_advagg_asset_render_alter().
            $asset_type = 'prefetch';
            $this->moduleHandler
                ->alter('advagg_asset_render', $prefetch, $alter_type, $asset_type);
            $resource_commands[] = new PrependCommand('head', $this->renderer
                ->renderPlain($prefetch));
        }
        foreach (array_reverse($resource_commands) as $resource_command) {
            $response->addCommand($resource_command, TRUE);
        }
        // Prepend a command to merge changes and additions to drupalSettings.
        if (!empty($settings)) {
            // During Ajax requests basic path-specific settings are excluded from
            // new drupalSettings values. The original page where this request comes
            // from already has the right values. An Ajax request would update them
            // with values for the Ajax request and incorrectly override the page's
            // values.
            // @see system_js_settings_alter()
            unset($settings['path']);
            $response->addCommand(new SettingsCommand($settings, TRUE), TRUE);
        }
        $commands = $response->getCommands();
        $this->moduleHandler
            ->alter('ajax_render', $commands);
        return $commands;
    }

}