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<?php |
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declare(strict_types=1); |
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namespace Facile\ZFLinkHeadersModule\Listener; |
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use Zend\Http\Header\GenericMultiHeader; |
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use Zend\Http\Header\HeaderInterface; |
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use Zend\Http\Header\HeaderValue; |
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use Zend\Http\PhpEnvironment\Response; |
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abstract class AbstractLinkHandler implements LinkHandlerInterface |
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{ |
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const RFC_PARAMS = [ |
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'rel', |
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'anchor', |
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'rev', |
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'hreflang', |
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'media', |
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'title', |
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'type', |
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]; |
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/** |
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* Get the attribute string for the header |
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* |
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* @param string $name |
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* @param string $value |
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* @return string |
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*/ |
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protected function getAttributeForHeader(string $name, $value): string |
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{ |
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$name = \strtolower($name); |
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// all RFC params must have a value, but not link-extensions |
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if (null === $value && ! \in_array($name, self::RFC_PARAMS, true)) { |
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return $name; |
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} |
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return \sprintf('%s="%s"', $name, \addslashes(HeaderValue::filter($value ?: null))); |
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} |
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/** |
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* Returns the link header |
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* |
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* @param array $attributes |
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* @return string |
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*/ |
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protected function createLinkHeaderValue(array $attributes): string |
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{ |
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$href = $attributes['href']; |
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unset($attributes['href']); |
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$attributeLines = []; |
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foreach ($attributes as $name => $value) { |
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$attributeLines[] = $this->getAttributeForHeader($name, $value); |
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} |
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return \sprintf('<%s>; %s', $href, \implode('; ', $attributeLines)); |
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} |
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/** |
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* @param Response $response |
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* @param array $values |
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*/ |
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protected function addLinkHeader(Response $response, array $values) |
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{ |
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if (! \count($values)) { |
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return; |
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} |
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$header = new GenericMultiHeader('Link', \implode(', ', $values)); |
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$currentHeader = $response->getHeaders()->get($header->getFieldName()); |
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/** @var HeaderInterface[] $headers */ |
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$headers = []; |
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if ($currentHeader instanceof \ArrayIterator) { |
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1 |
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$headers = \iterator_to_array($currentHeader); |
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} elseif (false !== $currentHeader) { |
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3 |
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$headers[] = $currentHeader; |
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} |
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foreach ($headers as $headerItem) { |
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$response->getHeaders()->removeHeader($headerItem); |
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} |
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$headers[] = $header; |
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$headerValues = \array_map( |
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function (HeaderInterface $header) { |
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return $header->getFieldValue(); |
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}, |
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$headers |
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); |
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$response->getHeaders()->addHeader(new GenericMultiHeader($header->getFieldName(), \implode(', ', $headerValues))); |
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} |
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} |
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facile-it /
zf-link-headers-module
