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<?php |
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namespace Signifly\Shopify\REST; |
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use Illuminate\Support\Arr; |
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use Illuminate\Support\Collection; |
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use Illuminate\Support\Str; |
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use Iterator; |
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use RuntimeException; |
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use Signifly\Shopify\Shopify; |
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class Cursor implements Iterator |
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{ |
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const LINK_REGEX = '/<(.*page_info=([a-z0-9\-]+).*)>; rel="?{type}"?/i'; |
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protected Shopify $shopify; |
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protected int $position = 0; |
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protected array $links = []; |
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protected array $results = []; |
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protected string $resourceClass; |
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public function __construct(Shopify $shopify, Collection $results) |
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{ |
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$this->shopify = $shopify; |
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$this->results[$this->position] = $results; |
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$this->detectResourceClass(); |
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$this->extractLinks(); |
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} |
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public function current(): Collection |
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{ |
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return $this->results[$this->position]; |
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} |
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public function hasNext(): bool |
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{ |
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return ! empty($this->links['next']); |
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} |
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public function hasPrev(): bool |
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{ |
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return $this->position > 0; |
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} |
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public function key(): int |
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{ |
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return $this->position; |
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} |
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public function next(): void |
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{ |
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$this->position++; |
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if (! $this->valid() && $this->hasNext()) { |
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$this->results[$this->position] = $this->fetchNextResults(); |
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$this->extractLinks(); |
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} |
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} |
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public function prev(): void |
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{ |
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if (! $this->hasPrev()) { |
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throw new RuntimeException('No previous results available.'); |
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} |
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$this->position--; |
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} |
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public function rewind(): void |
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{ |
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$this->position = 0; |
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} |
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public function valid(): bool |
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{ |
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return isset($this->results[$this->position]); |
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} |
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protected function extractLinks(): void |
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{ |
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$response = $this->shopify->getLastResponse(); |
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if (! $response->header('Link')) { |
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$this->links = []; |
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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->header('Link'), |
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$matches |
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); |
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if ($matched) { |
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$links[$type] = $matches[1]; |
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} |
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} |
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$this->links = $links; |
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} |
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protected function fetchNextResults(): Collection |
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{ |
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$response = $this->shopify->get( |
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Str::after($this->links['next'], $this->shopify->getBaseUrl()) |
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); |
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return Collection::make(Arr::first($response->json())) |
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->map(fn ($attr) => new $this->resourceClass($attr, $this->shopify)); |
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} |
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private function detectResourceClass() |
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{ |
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if ($resource = optional($this->results[0])->first()) { |
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$this->resourceClass = get_class($resource); |
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} |
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} |
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} |
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signifly /
laravel-shopify
