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<?php |
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namespace Slince\Shopify\Common; |
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use GuzzleHttp\Psr7\Request; |
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use Psr\Http\Message\ResponseInterface; |
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use Slince\Shopify\Client; |
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use Slince\Shopify\Common\Manager\ManagerInterface; |
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use Slince\Shopify\Common\Model\ModelInterface; |
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use Slince\Shopify\Exception\RuntimeException; |
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class CursorBasedPagination |
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{ |
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const LINK_REGEX = '/<(.*page_info=([a-z0-9\-_]+).*)>; rel="?{type}"?/i'; |
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/** |
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* @var string |
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*/ |
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protected $resource; |
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/** |
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* @var array |
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*/ |
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protected $query; |
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/** |
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* @var ManagerInterface |
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*/ |
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protected $manager; |
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/** |
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* @var array |
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*/ |
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protected $links = []; |
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public function __construct(ManagerInterface $manager, $resource, $query = []) |
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{ |
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$this->manager = $manager; |
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$this->resource = $resource; |
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$this->query = $query; |
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} |
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/** |
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* Gets the current page data. |
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* |
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* @param string $pageInfo |
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* @return ModelInterface[] |
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*/ |
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public function current($pageInfo = null) |
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{ |
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$client = $this->manager->getClient(); |
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$query = $this->query; |
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if (null !== $pageInfo) { |
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$query = array_intersect_key($query, ['limit' => true, 'fields' => true]); |
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$query['page_info'] = $pageInfo; |
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} |
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$data = $client->get($this->resource, $query); |
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$this->links = $this->extractHeaderLink($client->getLastResponse()); |
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return $this->manager->createMany(reset($data)); |
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} |
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protected function extractHeaderLink(ResponseInterface $response) |
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{ |
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if (!$response->hasHeader('Link')) { |
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return []; |
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} |
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$links = [ |
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'next' => null, |
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'previous' => null, |
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]; |
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foreach (array_keys($links) as $type) { |
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$matched = preg_match( |
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str_replace('{type}', $type, static::LINK_REGEX), |
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$response->getHeader('Link')[0], |
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$matches |
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); |
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if ($matched) { |
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$links[$type] = $matches[2]; |
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} |
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} |
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return $links; |
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} |
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/** |
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* Get the next page of data. |
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* |
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* @return ModelInterface[] |
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*/ |
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public function next() |
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{ |
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if (!$this->hasNext()) { |
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throw new RuntimeException("There's no next page"); |
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} |
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return $this->current($this->links['next']); |
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} |
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/** |
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* Checks whether has next page. |
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* |
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* @return bool |
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*/ |
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public function hasNext() |
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{ |
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return !empty($this->links['next']); |
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} |
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/** |
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* Gets the next page info. |
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* |
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* @return string|null |
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*/ |
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public function getNextPageInfo() |
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{ |
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return isset($this->links['next']) ? $this->links['next'] : null; |
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} |
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/** |
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* Get the previous page of data. |
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* |
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* @return ModelInterface[] |
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*/ |
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public function prev() |
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{ |
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if (!$this->hasPrev()) { |
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throw new RuntimeException("There's no previous page"); |
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} |
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return $this->current($this->links['previous']); |
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} |
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/** |
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* Checks whether has previous page. |
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* |
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* @return bool |
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*/ |
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public function hasPrev() |
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{ |
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return !empty($this->links['previous']); |
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} |
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/** |
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* Gets the previous page info. |
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* |
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* @return string|null |
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*/ |
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public function getPrevPageInfo() |
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{ |
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return isset($this->links['previous']) ? $this->links['previous'] : null; |
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} |
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} |
slince /
shopify-api-php
