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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 Client |
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*/ |
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protected $client; |
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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->client = $manager->getClient(); |
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$this->resource = $resource; |
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$this->query = $query; |
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} |
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/** |
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* Gets the current page data. |
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* |
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* @return ModelInterface[] |
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*/ |
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public function current() |
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{ |
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$data = $this->client->get($this->resource, $this->query); |
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$this->links = $this->extractHeaderLink($this->client->getLastResponse()); |
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return $this->manager->createMany(reset($data)); |
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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 $this->fetchResource($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($this->links['next']); |
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} |
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/** |
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* Get the previous page of data. |
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* |
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* @return ModelInterface[] |
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*/ |
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public function prev() |
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{ |
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if (!$this->hasNext()) { |
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throw new RuntimeException("There's no previous page"); |
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} |
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return $this->fetchResource($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($this->links['previous']); |
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} |
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protected function fetchResource($url) |
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{ |
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$request = new Request('GET', $url, [ |
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'Content-Type' => 'application/json', |
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]); |
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$response = $this->client->sendRequest($request); |
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$data = \GuzzleHttp\json_decode((string)$response->getBody(), true); |
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$this->links = $this->extractHeaderLink($this->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[1]; |
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} |
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} |
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return $links; |
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} |
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} |
slince /
shopify-api-php
