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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Drupal\display_builder\Controller; |
| 6 | |
| 7 | use Drupal\Component\Datetime\TimeInterface; |
| 8 | use Drupal\Core\Controller\ControllerBase; |
| 9 | use Drupal\Core\Render\RendererInterface; |
| 10 | use Drupal\Core\TempStore\SharedTempStoreFactory; |
| 11 | use Drupal\display_builder\Entity\ProfileInterface; |
| 12 | use Drupal\display_builder\Event\DisplayBuilderEvent; |
| 13 | use Drupal\display_builder\Event\DisplayBuilderEvents; |
| 14 | use Drupal\display_builder\InstanceInterface; |
| 15 | use Symfony\Component\DependencyInjection\Attribute\Autowire; |
| 16 | use Symfony\Component\HttpFoundation\Request; |
| 17 | use Symfony\Component\HttpFoundation\RequestStack; |
| 18 | use Symfony\Component\HttpFoundation\Session\SessionInterface; |
| 19 | use Symfony\Contracts\EventDispatcher\EventDispatcherInterface; |
| 20 | |
| 21 | /** |
| 22 | * Returns responses for Display builder routes. |
| 23 | */ |
| 24 | abstract class ApiControllerBase extends ControllerBase { |
| 25 | |
| 26 | public const string SSE_COLLECTION = 'display_builder_sse'; |
| 27 | |
| 28 | /** |
| 29 | * Request header listing the island plugin IDs currently visible on screen. |
| 30 | * |
| 31 | * Sent as a header rather than a request parameter on purpose: update() and |
| 32 | * thirdPartySettingsUpdate() feed the whole request payload straight into |
| 33 | * FormState::setValues(), so an extra body field would become a bogus form |
| 34 | * value. |
| 35 | * |
| 36 | * When the header is absent - server-sent events, functional tests, any |
| 37 | * non-JS caller - every island is rendered, which is the behavior that |
| 38 | * predates deferral. |
| 39 | * |
| 40 | * @see components/display_builder/js/deferred_islands.js |
| 41 | * @see \Drupal\display_builder\Event\DisplayBuilderEventsSubscriber::shouldDefer() |
| 42 | */ |
| 43 | public const string VISIBLE_ISLANDS_HEADER = 'X-DB-Visible-Islands'; |
| 44 | |
| 45 | /** |
| 46 | * The list of DB events which triggers SSE refresh. |
| 47 | * |
| 48 | * ON_ACTIVE is intentionally excluded: it is a client-side presence signal |
| 49 | * that must not trigger a full SSE broadcast to avoid feedback loops. |
| 50 | */ |
| 51 | public const array SSE_EVENTS = [ |
| 52 | DisplayBuilderEvents::ON_ATTACH_TO_ROOT, |
| 53 | DisplayBuilderEvents::ON_ATTACH_TO_SLOT, |
| 54 | DisplayBuilderEvents::ON_DELETE, |
| 55 | DisplayBuilderEvents::ON_HISTORY_CHANGE, |
| 56 | DisplayBuilderEvents::ON_MOVE, |
| 57 | DisplayBuilderEvents::ON_PRESET_SAVE, |
| 58 | DisplayBuilderEvents::ON_PUBLISH, |
| 59 | DisplayBuilderEvents::ON_RESTORE, |
| 60 | DisplayBuilderEvents::ON_REVERT, |
| 61 | DisplayBuilderEvents::ON_UPDATE, |
| 62 | ]; |
| 63 | |
| 64 | /** |
| 65 | * The Display Builder instance triggering the action. |
| 66 | */ |
| 67 | protected InstanceInterface $builder; |
| 68 | |
| 69 | /** |
| 70 | * Plugin ID of the island triggering the HTMX event. |
| 71 | * |
| 72 | * If not NULL, the island will be skipped from the event dispatch. Useful to |
| 73 | * avoid swapping the content of an island which is already in the expected |
| 74 | * state. For examples, if we move an instance in Builder, Wireframe or Tree |
| 75 | * panels, if we change the settings in InstanceForm. |
| 76 | * |
| 77 | * @see \Drupal\display_builder\Event\DisplayBuilderEventsSubscriber::dispatchToIslands() |
| 78 | * @see \Drupal\display_builder\HtmxEvents |
| 79 | */ |
| 80 | protected ?string $islandId = NULL; |
| 81 | |
| 82 | /** |
| 83 | * The lazy loaded display builder. |
| 84 | */ |
| 85 | protected ?ProfileInterface $displayBuilder = NULL; |
| 86 | |
| 87 | public function __construct( |
| 88 | protected EventDispatcherInterface $eventDispatcher, |
| 89 | protected RendererInterface $renderer, |
| 90 | protected TimeInterface $time, |
| 91 | #[Autowire(service: 'tempstore.shared')] |
| 92 | protected SharedTempStoreFactory $sharedTempStoreFactory, |
| 93 | protected SessionInterface $session, |
| 94 | protected RequestStack $requestStack, |
| 95 | ) {} |
| 96 | |
| 97 | /** |
| 98 | * Reads the islands the client reports as currently visible. |
| 99 | * |
| 100 | * @return array|null |
| 101 | * The island plugin IDs, or NULL when the client did not report any, in |
| 102 | * which case no island is deferred. |
| 103 | * |
| 104 | * @see self::VISIBLE_ISLANDS_HEADER |
| 105 | */ |
| 106 | protected function getVisibleIslands(): ?array { |
| 107 | $request = $this->requestStack->getCurrentRequest(); |
| 108 | |
| 109 | if (!$request instanceof Request || !$request->headers->has($this::VISIBLE_ISLANDS_HEADER)) { |
| 110 | return NULL; |
| 111 | } |
| 112 | |
| 113 | $header = \trim((string) $request->headers->get($this::VISIBLE_ISLANDS_HEADER)); |
| 114 | |
| 115 | // An empty header is a valid report: the client says nothing deferrable is |
| 116 | // on screen. Distinct from an absent header, which reports nothing at all. |
| 117 | if ($header === '') { |
| 118 | return []; |
| 119 | } |
| 120 | |
| 121 | return \array_values(\array_filter(\array_map(\trim(...), \explode(',', $header)))); |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Dispatches a display builder event. |
| 126 | * |
| 127 | * @param string $event_id |
| 128 | * The event ID. |
| 129 | * @param array|null $data |
| 130 | * The data. |
| 131 | * @param string|null $node_id |
| 132 | * Optional instance ID. |
| 133 | * @param string|null $parent_id |
| 134 | * Optional parent ID. |
| 135 | * |
| 136 | * @return array |
| 137 | * A renderable array. |
| 138 | */ |
| 139 | protected function dispatchDisplayBuilderEvent( |
| 140 | string $event_id, |
| 141 | ?array $data = NULL, |
| 142 | ?string $node_id = NULL, |
| 143 | ?string $parent_id = NULL, |
| 144 | ): array { |
| 145 | $event = $this->createEventWithEnabledIsland($event_id, $data, $node_id, $parent_id); |
| 146 | $this->saveSseData($event_id); |
| 147 | |
| 148 | return $event->getResult(); |
| 149 | } |
| 150 | |
| 151 | /** |
| 152 | * Creates a display builder event with enabled islands only. |
| 153 | * |
| 154 | * Use a cache to avoid loading all the builder configuration. |
| 155 | * |
| 156 | * @param string $event_id |
| 157 | * The event ID. |
| 158 | * @param array|null $data |
| 159 | * The data. |
| 160 | * @param string|null $node_id |
| 161 | * Optional Instance entity ID. |
| 162 | * @param string|null $parent_id |
| 163 | * Optional parent ID. |
| 164 | * |
| 165 | * @return \Drupal\display_builder\Event\DisplayBuilderEvent |
| 166 | * The event. |
| 167 | */ |
| 168 | protected function createEventWithEnabledIsland(string $event_id, ?array $data, ?string $node_id, ?string $parent_id): DisplayBuilderEvent { |
| 169 | $event = new DisplayBuilderEvent( |
| 170 | $this->builder, |
| 171 | $data, |
| 172 | $node_id, |
| 173 | $parent_id, |
| 174 | $this->islandId, |
| 175 | $this->getVisibleIslands(), |
| 176 | ); |
| 177 | $this->eventDispatcher->dispatch($event, $event_id); |
| 178 | |
| 179 | return $event; |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * Save data for SSE. |
| 184 | * |
| 185 | * @param string $event_id |
| 186 | * The event ID. |
| 187 | */ |
| 188 | protected function saveSseData(string $event_id): void { |
| 189 | if (!\in_array($event_id, $this::SSE_EVENTS, TRUE)) { |
| 190 | return; |
| 191 | } |
| 192 | |
| 193 | $state = [ |
| 194 | 'sessionId' => $this->session->getId(), |
| 195 | 'timestamp' => $this->time->getRequestTime(), |
| 196 | // instanceId here is the ID of a display_builder_instance entity. |
| 197 | 'instanceId' => (string) $this->builder->id(), |
| 198 | ]; |
| 199 | $collection = $this->sharedTempStoreFactory->get($this::SSE_COLLECTION); |
| 200 | $collection->set(\sprintf('%s_latest', (string) $this->builder->id()), $state); |
| 201 | } |
| 202 | |
| 203 | } |