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<?php
namespace Drupal\Core\Ajax;
use Drupal\Core\Asset\AssetCollectionRendererInterface;
use Drupal\Core\Asset\AssetResolverInterface;
use Drupal\Core\Asset\AttachedAssets;
use Drupal\Core\Config\ConfigFactoryInterface;
use Drupal\Core\Extension\ModuleHandlerInterface;
use Drupal\Core\Render\AttachmentsInterface;
use Drupal\Core\Render\AttachmentsResponseProcessorInterface;
use Drupal\Core\Render\RendererInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RequestStack;
/**
* Processes attachments of AJAX responses.
*
* @see \Drupal\Core\Ajax\AjaxResponse
* @see \Drupal\Core\Render\MainContent\AjaxRenderer
*/
class AjaxResponseAttachmentsProcessor implements AttachmentsResponseProcessorInterface {
/**
* The asset resolver service.
*
* @var \Drupal\Core\Asset\AssetResolverInterface
*/
protected $assetResolver;
/**
* A config object for the system performance configuration.
*
* @var \Drupal\Core\Config\Config
*/
protected $config;
/**
* The CSS asset collection renderer service.
*
* @var \Drupal\Core\Asset\AssetCollectionRendererInterface
*/
protected $cssCollectionRenderer;
/**
* The JS asset collection renderer service.
*
* @var \Drupal\Core\Asset\AssetCollectionRendererInterface
*/
protected $jsCollectionRenderer;
/**
* The request stack.
*
* @var \Symfony\Component\HttpFoundation\RequestStack
*/
protected $requestStack;
/**
* The renderer.
*
* @var \Drupal\Core\Render\RendererInterface
*/
protected $renderer;
/**
* The module handler.
*
* @var \Drupal\Core\Extension\ModuleHandlerInterface
*/
protected $moduleHandler;
/**
* Constructs a AjaxResponseAttachmentsProcessor object.
*
* @param \Drupal\Core\Asset\AssetResolverInterface $asset_resolver
* An asset resolver.
* @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
* A config factory for retrieving required config objects.
* @param \Drupal\Core\Asset\AssetCollectionRendererInterface $css_collection_renderer
* The CSS asset collection renderer.
* @param \Drupal\Core\Asset\AssetCollectionRendererInterface $js_collection_renderer
* The JS asset collection renderer.
* @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
* The request stack.
* @param \Drupal\Core\Render\RendererInterface $renderer
* The renderer.
* @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
* The module handler.
*/
public function __construct(AssetResolverInterface $asset_resolver, ConfigFactoryInterface $config_factory, AssetCollectionRendererInterface $css_collection_renderer, AssetCollectionRendererInterface $js_collection_renderer, RequestStack $request_stack, RendererInterface $renderer, ModuleHandlerInterface $module_handler) {
$this->assetResolver = $asset_resolver;
$this->config = $config_factory->get('system.performance');
$this->cssCollectionRenderer = $css_collection_renderer;
$this->jsCollectionRenderer = $js_collection_renderer;
$this->requestStack = $request_stack;
$this->renderer = $renderer;
$this->moduleHandler = $module_handler;
}
/**
* {@inheritdoc}
*/
public function processAttachments(AttachmentsInterface $response) {
// @todo Convert to assertion once https://www.drupal.org/node/2408013 lands
if (!$response instanceof AjaxResponse) {
throw new \InvalidArgumentException('\Drupal\Core\Ajax\AjaxResponse instance expected.');
}
$request = $this->requestStack->getCurrentRequest();
if ($response->getContent() == '{}') {
$response->setData($this->buildAttachmentsCommands($response, $request));
}
return $response;
}
/**
* Prepares the AJAX commands to attach assets.
*
* @param \Drupal\Core\Ajax\AjaxResponse $response
* The AJAX response to update.
* @param \Symfony\Component\HttpFoundation\Request $request
* The request object that the AJAX is responding to.
*
* @return array
* An array of commands ready to be returned as JSON.
*/
protected function buildAttachmentsCommands(AjaxResponse $response, Request $request) {
$ajax_page_state = $request->request->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);
// 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.
$resource_commands = array();
if ($css_assets) {
$css_render_array = $this->cssCollectionRenderer->render($css_assets);
$resource_commands[] = new AddCssCommand($this->renderer->renderPlain($css_render_array));
}
if ($js_assets_header) {
$js_header_render_array = $this->jsCollectionRenderer->render($js_assets_header);
$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);
$resource_commands[] = new AppendCommand('body', $this->renderer->renderPlain($js_footer_render_array));
}
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;
}
}