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<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\rest;
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use Yii;
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use yii\base\Component;
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use yii\base\Model;
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use yii\data\DataProviderInterface;
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use yii\data\Pagination;
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use yii\helpers\ArrayHelper;
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use yii\web\Request;
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use yii\web\Response;
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/**
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class Serializer extends Component
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{
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public $fieldsParam = 'fields';
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public $expandParam = 'expand';
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public $totalCountHeader = 'X-Pagination-Total-Count';
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public $pageCountHeader = 'X-Pagination-Page-Count';
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public $currentPageHeader = 'X-Pagination-Current-Page';
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public $perPageHeader = 'X-Pagination-Per-Page';
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/**
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* @var Request
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*/
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public $request;
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/**
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* @var Response
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*/
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public $response;
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public function init()
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{
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if ($this->request === null) {
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$this->request = Yii::$app->getRequest();
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}
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if ($this->response === null) {
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$this->response = Yii::$app->getResponse();
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}
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}
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public function serialize($data)
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{
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if ($data instanceof Model) {
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return $data->hasErrors() ? $this->serializeModelErrors($data) : $this->serializeModel($data);
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} elseif ($data instanceof DataProviderInterface) {
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return $this->serializeDataProvider($data);
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} else {
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return $data;
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}
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}
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protected function getRequestedFields()
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{
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$fields = $this->request->get($this->fieldsParam);
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$expand = $this->request->get($this->expandParam);
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return [
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preg_split('/\s*,\s*/', $fields, -1, PREG_SPLIT_NO_EMPTY),
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preg_split('/\s*,\s*/', $expand, -1, PREG_SPLIT_NO_EMPTY),
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];
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}
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/**
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* @param DataProviderInterface $dataProvider
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* @return array
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*/
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protected function serializeDataProvider($dataProvider)
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{
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$models = $dataProvider->getModels();
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if (($pagination = $dataProvider->getPagination()) !== false) {
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$this->addPaginationHeaders($pagination);
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}
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if ($this->request->getIsHead()) {
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return null;
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} else {
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return $this->serializeModels($models);
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}
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}
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/**
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* @param Pagination $pagination
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*/
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protected function addPaginationHeaders($pagination)
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{
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$links = [];
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foreach ($pagination->getLinks(true) as $rel => $url) {
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$links[] = "<$url>; rel=$rel";
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}
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$this->response->getHeaders()
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->set($this->totalCountHeader, $pagination->totalCount)
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->set($this->pageCountHeader, $pagination->getPageCount())
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->set($this->currentPageHeader, $pagination->getPage() + 1)
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->set($this->perPageHeader, $pagination->pageSize)
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->set('Link', implode(', ', $links));
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}
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/**
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* @param Model $model
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* @return array
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*/
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protected function serializeModel($model)
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{
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if ($this->request->getIsHead()) {
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return null;
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} else {
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list ($fields, $expand) = $this->getRequestedFields();
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return $model->toArray($fields, $expand);
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}
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}
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/**
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* @param Model $model
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* @return array
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*/
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protected function serializeModelErrors($model)
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{
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$this->response->setStatusCode(422, 'Data Validation Failed.');
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$result = [];
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foreach ($model->getFirstErrors() as $name => $message) {
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$result[] = [
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'field' => $name,
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'message' => $message,
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];
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}
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return $result;
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}
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protected function serializeModels(array $models)
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{
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list ($fields, $expand) = $this->getRequestedFields();
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foreach ($models as $i => $model) {
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if ($model instanceof Model) {
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$models[$i] = $model->toArray($fields, $expand);
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} elseif (is_array($model)) {
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$models[$i] = ArrayHelper::toArray($model);
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}
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}
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return $models;
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}
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}
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