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<?php |
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/* |
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* This file is part of the FOSHttpCache package. |
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* |
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* (c) FriendsOfSymfony <http://friendsofsymfony.github.com/> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace FOS\HttpCache; |
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use FOS\HttpCache\Exception\InvalidTagException; |
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use FOS\HttpCache\ProxyClient\Invalidation\TagsInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Symfony\Component\OptionsResolver\OptionsResolver; |
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/** |
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* Service for Response cache tagging. |
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* |
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* @author David de Boer <[email protected]> |
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* @author David Buchmann <[email protected]> |
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* @author André Rømcke <[email protected]> |
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* @author Wicliff Wolda <[email protected]> |
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*/ |
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class ResponseTagger |
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{ |
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/** |
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* @var array |
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*/ |
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private $options; |
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/** |
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* @var TagsInterface |
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*/ |
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private $client; |
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/** |
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* @var array |
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*/ |
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private $tags = []; |
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/** |
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* Constructor |
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* |
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* @param TagsInterface $client |
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* @param array $options supported options: |
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* - strict (bool) Default: false. If set to true, throws exception when adding empty tags. |
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*/ |
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public function __construct(TagsInterface $client, array $options = array()) |
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{ |
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$this->client = $client; |
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$resolver = new OptionsResolver(); |
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$resolver->setDefaults(array( |
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'strict' => false, |
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)); |
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$resolver->setAllowedTypes('strict', 'bool'); |
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$this->options = $resolver->resolve($options); |
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} |
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/** |
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* Get the HTTP header name that will hold cache tags. |
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* |
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* @return string |
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*/ |
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public function getTagsHeaderName() |
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{ |
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return $this->client->getTagsHeaderName(); |
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} |
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/** |
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* Get the value for the HTTP tag header. |
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* |
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* This concatenates all tags and ensures correct encoding. |
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* |
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* @return string |
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*/ |
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public function getTagsHeaderValue() |
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{ |
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return $this->client->getTagsHeaderValue($this->tags); |
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} |
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/** |
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* Check whether the tag handler has any tags to set on the response. |
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* |
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* @return bool True if this handler will set at least one tag. |
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*/ |
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public function hasTags() |
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{ |
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return 0 < count($this->tags); |
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} |
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/** |
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* Add tags to be set on the response. |
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* |
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* This must be called before any HTTP response is sent to the client. |
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* |
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* @param array $tags List of tags to add. |
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* |
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* @throws InvalidTagException |
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* |
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* @return $this |
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*/ |
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public function addTags(array $tags) |
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{ |
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$filtered = array_filter($tags, 'strlen'); |
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if ($this->options['strict'] && array_diff($tags, $filtered)) { |
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throw new InvalidTagException('Empty tags are not allowed'); |
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} |
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$this->tags = array_merge($this->tags, $filtered); |
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return $this; |
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} |
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/** |
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* Set tags on a response |
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* |
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* @param ResponseInterface $response Original response |
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* @param bool $replace Whether to replace the current tags |
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* on the response |
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* |
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* @return ResponseInterface Tagged response |
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*/ |
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public function tagResponse(ResponseInterface $response, $replace = false) |
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{ |
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if ($replace) { |
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return $response->withHeader($this->getTagsHeaderName(), $this->getTagsHeaderValue()); |
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} |
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return $response->withAddedHeader($this->getTagsHeaderName(), $this->getTagsHeaderValue()); |
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} |
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} |
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FriendsOfSymfony /
FOSHttpCache
