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<?php |
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namespace Bone\Http\Middleware; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Server\MiddlewareInterface; |
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use Psr\Http\Server\RequestHandlerInterface; |
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class HalCollection implements MiddlewareInterface |
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{ |
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/** @var int $numPerPage */ |
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private $numPerPage; |
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/** |
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* HalCollection constructor. |
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* @param int $numPerPage |
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*/ |
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public function __construct(int $numPerPage) |
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{ |
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$this->numPerPage = $numPerPage; |
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} |
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/** |
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* @param ServerRequestInterface $request |
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* @param RequestHandlerInterface $handler |
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* @return ResponseInterface |
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*/ |
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public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface |
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{ |
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$params = $request->getQueryParams(); |
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$page = isset($params['page']) ? (int) $params['page'] : 1; |
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$limit = $this->numPerPage; |
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$params['limit'] = $limit; |
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$params['offset'] = ($page * $limit) - $limit; |
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$request = $request->withQueryParams($params); |
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$response = $handler->handle($request); |
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$uri = $request->getUri(); |
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$data = json_decode($response->getBody()->getContents(), true); |
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$pageCount = (int) ceil($data['total'] / $limit); |
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$hal = [ |
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'_links' => [ |
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'self' => [ |
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'href' => $uri->getScheme() . '://' . $uri->getHost() . $uri->getPath(), |
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], |
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'first' => [ |
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'href' => $uri->getScheme() . '://' . $uri->getHost() . $uri->getPath(), |
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], |
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], |
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]; |
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if ($page !== 1) { |
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$hal['_links']['prev'] = [ |
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'href' => $uri->getScheme() . '://' . $uri->getHost() . $uri->getPath() . '?page=' . ($page - 1), |
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]; |
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} |
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if ($page !== $pageCount) { |
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$hal['_links']['next'] = [ |
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'href' => $uri->getScheme() . '://' . $uri->getHost() . $uri->getPath() . '?page=' . ($page + 1), |
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]; |
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} |
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$hal['_links']['last'] = [ |
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'href' => $uri->getScheme() . '://' . $uri->getHost() . $uri->getPath() . '?page=' . $pageCount, |
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]; |
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/** @todo add _self links for entities in collection */ |
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$data = array_merge($hal, $data); |
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foreach ($data['_embedded'] as $key => $value) { |
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$data['_embedded'][$key]['_links'] = [ |
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'self' => [ |
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'href' => $uri->getScheme() . '://' . $uri->getHost() . $uri->getPath() . '/' . $value['id'], |
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], |
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]; |
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} |
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$body = $response->getBody(); |
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$body->rewind(); |
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$body->write(json_encode($data)); |
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$response = $response->withHeader('Content-Type', 'application/hal+json'); |
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return $response->withBody($body); |
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} |
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} |
delboy1978uk /
bone-http
