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<?php /** * Joomla! Content Management System * * @copyright (C) 2019 Open Source Matters, Inc. <https://www.joomla.org> * @license GNU General Public License version 2 or later; see LICENSE.txt */ namespace Joomla\CMS\MVC\View; \defined('_JEXEC') or die; use Joomla\CMS\Document\JsonapiDocument; use Joomla\CMS\Factory; use Joomla\CMS\MVC\View\Event\OnGetApiFields; use Joomla\CMS\Router\Exception\RouteNotFoundException; use Joomla\CMS\Serializer\JoomlaSerializer; use Joomla\CMS\Uri\Uri; use Tobscure\JsonApi\AbstractSerializer; use Tobscure\JsonApi\Collection; use Tobscure\JsonApi\Resource; /** * Base class for a Joomla Json List View * * Class holding methods for displaying presentation data. * * @since 4.0.0 */ abstract class JsonApiView extends JsonView { /** * The active document object (Redeclared for typehinting) * * @var JsonapiDocument * @since 3.0 */ public $document; /** * The content type * * @var string */ protected $type; /** * Item relationship * * @var array * * @since 4.0.0 */ protected $relationship = []; /** * Serializer data * * @var AbstractSerializer * @since 4.0.0 */ protected $serializer; /** * The fields to render item in the documents * * @var array * @since 4.0.0 */ protected $fieldsToRenderItem = []; /** * The fields to render items in the documents * * @var array * @since 4.0.0 */ protected $fieldsToRenderList = []; /** * Constructor. * * @param array $config A named configuration array for object construction. * contentType: the name (optional) of the content type to use for the serialization * * @since 4.0.0 */ public function __construct($config = []) { if (\array_key_exists('contentType', $config)) { $this->type = $config['contentType']; } if ($this->serializer === null) { $this->serializer = new JoomlaSerializer($this->type); } parent::__construct($config); } /** * Execute and display a template script. * * @param array|null $items Array of items * * @return string * * @since 4.0.0 */ public function displayList(array $items = null) { /** @var \Joomla\CMS\MVC\Model\ListModel $model */ $model = $this->getModel(); // Get page query $currentUrl = Uri::getInstance(); $currentPageDefaultInformation = ['offset' => 0, 'limit' => 20]; $currentPageQuery = $currentUrl->getVar('page', $currentPageDefaultInformation); if ($items === null) { $items = []; foreach ($model->getItems() as $item) { $items[] = $this->prepareItem($item); } } $pagination = $model->getPagination(); // Check for errors. if (\count($errors = $this->get('Errors'))) { throw new GenericDataException(implode("\n", $errors), 500); } if ($this->type === null) { throw new \RuntimeException('Content type missing'); } // Set up links for pagination $totalItemsCount = ($pagination->pagesTotal * $pagination->limit); $this->document->addMeta('total-pages', $pagination->pagesTotal) ->addLink('self', (string) $currentUrl); // Check for first and previous pages if ($pagination->limitstart > 0) { $firstPage = clone $currentUrl; $firstPageQuery = $currentPageQuery; $firstPageQuery['offset'] = 0; $firstPage->setVar('page', $firstPageQuery); $previousPage = clone $currentUrl; $previousPageQuery = $currentPageQuery; $previousOffset = $currentPageQuery['offset'] - $pagination->limit; $previousPageQuery['offset'] = $previousOffset >= 0 ? $previousOffset : 0; $previousPage->setVar('page', $previousPageQuery); $this->document->addLink('first', $this->queryEncode((string) $firstPage)) ->addLink('previous', $this->queryEncode((string) $previousPage)); } // Check for next and last pages if ($pagination->limitstart + $pagination->limit < $totalItemsCount) { $nextPage = clone $currentUrl; $nextPageQuery = $currentPageQuery; $nextOffset = $currentPageQuery['offset'] + $pagination->limit; $nextPageQuery['offset'] = ($nextOffset > ($pagination->pagesTotal * $pagination->limit)) ? $pagination->pagesTotal - $pagination->limit : $nextOffset; $nextPage->setVar('page', $nextPageQuery); $lastPage = clone $currentUrl; $lastPageQuery = $currentPageQuery; $lastPageQuery['offset'] = ($pagination->pagesTotal - 1) * $pagination->limit; $lastPage->setVar('page', $lastPageQuery); $this->document->addLink('next', $this->queryEncode((string) $nextPage)) ->addLink('last', $this->queryEncode((string) $lastPage)); } $eventData = ['type' => OnGetApiFields::LIST, 'fields' => $this->fieldsToRenderList, 'context' => $this->type]; $event = new OnGetApiFields('onApiGetFields', $eventData); /** @var OnGetApiFields $eventResult */ $eventResult = Factory::getApplication()->getDispatcher()->dispatch('onApiGetFields', $event); $collection = (new Collection($items, $this->serializer)) ->fields([$this->type => $eventResult->getAllPropertiesToRender()]); if (!empty($this->relationship)) { $collection->with($this->relationship); } // Set the data into the document and render it $this->document->setData($collection); return $this->document->render(); } /** * Execute and display a template script. * * @param object $item Item * * @return string * * @since 4.0.0 */ public function displayItem($item = null) { if ($item === null) { /** @var \Joomla\CMS\MVC\Model\AdminModel $model */ $model = $this->getModel(); $item = $this->prepareItem($model->getItem()); } if ($item->id === null) { throw new RouteNotFoundException('Item does not exist'); } // Check for errors. if (\count($errors = $this->get('Errors'))) { throw new GenericDataException(implode("\n", $errors), 500); } if ($this->type === null) { throw new \RuntimeException('Content type missing'); } $eventData = [ 'type' => OnGetApiFields::ITEM, 'fields' => $this->fieldsToRenderItem, 'relations' => $this->relationship, 'context' => $this->type, ]; $event = new OnGetApiFields('onApiGetFields', $eventData); /** @var OnGetApiFields $eventResult */ $eventResult = Factory::getApplication()->getDispatcher()->dispatch('onApiGetFields', $event); $element = (new Resource($item, $this->serializer)) ->fields([$this->type => $eventResult->getAllPropertiesToRender()]); if (!empty($this->relationship)) { $element->with($eventResult->getAllRelationsToRender()); } $this->document->setData($element); $this->document->addLink('self', Uri::current()); return $this->document->render(); } /** * Prepare item before render. * * @param object $item The model item * * @return object * * @since 4.0.0 */ protected function prepareItem($item) { return $item; } /** * Encode square brackets in the URI query, according to JSON API specification. * * @param string $query The URI query * * @return string * * @since 4.0.0 */ protected function queryEncode($query) { return str_replace(array('[', ']'), array('%5B', '%5D'), $query); } }