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<?php |
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/** |
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* HttpLoader |
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*/ |
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namespace Graviton\ProxyBundle\Definition\Loader; |
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use Graviton\ProxyBundle\Definition\ApiDefinition; |
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use Graviton\ProxyBundle\Definition\Loader\CacheStrategy\CacheStrategyInterface; |
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use Graviton\ProxyBundle\Definition\Loader\DispersalStrategy\DispersalStrategyInterface; |
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use Guzzle\Http\Client; |
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use Guzzle\Http\Message\RequestInterface; |
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use Symfony\Component\HttpFoundation\Response; |
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use Symfony\Component\HttpKernel\Exception\HttpException; |
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use Symfony\Component\Validator\Constraints\Url; |
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use Symfony\Component\Validator\Validator\ValidatorInterface; |
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/** |
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* load a file over http and process the data |
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* |
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* @author List of contributors <https://github.com/libgraviton/graviton/graphs/contributors> |
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* @license http://opensource.org/licenses/gpl-license.php GNU Public License |
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* @link http://swisscom.ch |
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*/ |
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class HttpLoader implements LoaderInterface |
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{ |
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/** |
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* @var ValidatorInterface |
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*/ |
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private $validator; |
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/** |
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* @var Client |
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*/ |
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private $client; |
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/** |
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* @var DispersalStrategyInterface |
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*/ |
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private $strategy; |
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/** |
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* @var CacheStrategyInterface |
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*/ |
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private $cacheStrategy; |
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/** |
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* @var array curl options to apply on each request |
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*/ |
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private $curlOptions = []; |
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/** |
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* @var array |
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*/ |
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private $options = [ |
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'storeKey' => 'httpLoader', |
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]; |
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/** |
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* constructor |
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* |
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* @param ValidatorInterface $validator validator |
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* @param Client $client http client |
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*/ |
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public function __construct(ValidatorInterface $validator, Client $client) |
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{ |
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$this->validator = $validator; |
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$this->client = $client; |
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} |
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/** |
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* @inheritDoc |
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* |
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* @param DispersalStrategyInterface $strategy dispersal strategy |
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* |
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* @return void |
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*/ |
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public function setDispersalStrategy($strategy) |
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{ |
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$this->strategy = $strategy; |
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} |
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/** |
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* @inheritDoc |
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* |
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* @param CacheStrategyInterface $strategy cache strategy |
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* |
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* @return void |
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*/ |
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public function setCacheStrategy($strategy) |
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{ |
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$this->cacheStrategy = $strategy; |
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} |
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/** |
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* set curl options |
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* |
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* @param array $curlOptions the curl options |
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*/ |
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public function setCurlOptions(array $curlOptions) |
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{ |
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$this->curlOptions = $curlOptions; |
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} |
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/** |
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* @inheritDoc |
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* |
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* @param array $options cache strategy |
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* |
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* @return void |
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*/ |
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public function setOptions($options) |
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{ |
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if (!empty($options['prefix'])) { |
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$options['storeKey'] = $options['prefix']; |
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unset($options['prefix']); |
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} |
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$this->options = array_merge($this->options, $options); |
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} |
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/** |
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* check if the url is valid |
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* |
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* @param string $url url |
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* |
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* @return boolean |
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*/ |
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public function supports($url) |
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{ |
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$error = $this->validator->validate($url, [new Url()]); |
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return 0 === count($error); |
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} |
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/** |
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* Applies the specified curl option on a request |
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* |
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* @param $request |
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*/ |
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protected function applyCurlOptions($request) { |
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$curl = $request->getCurlOptions(); |
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foreach ($this->curlOptions as $option => $value) { |
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$option = 'CURLOPT_' . strtoupper($option); |
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$curl->set(constant($option), $value); |
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} |
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} |
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/** |
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* @inheritDoc |
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* |
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* @param string $input url |
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* |
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* @return ApiDefinition |
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*/ |
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public function load($input) |
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{ |
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$retVal = null; |
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if (isset($this->strategy)) { |
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$request = $this->client->get($input); |
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$this->applyCurlOptions($request); |
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if (isset($this->cacheStrategy) && !$this->cacheStrategy->isExpired($this->options['storeKey'])) { |
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$content = $this->cacheStrategy->get($this->options['storeKey']); |
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if (empty($content)) { |
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$content = $this->fetchFile($request); |
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} |
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} else { |
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$content = $this->fetchFile($request); |
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} |
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// store current host (name or ip) serving the API. This MUST be the host only and does not include the |
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// scheme nor sub-paths. It MAY include a port. If the host is not included, the host serving the |
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// documentation is to be used (including the port) |
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$fallbackHost = array(); |
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$fallbackHost['host'] = sprintf( |
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'%s://%s:%d', |
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$request->getScheme(), |
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$request->getHost(), |
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$request->getPort() |
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); |
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if ($this->strategy->supports($content)) { |
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$retVal = $this->strategy->process($content, $fallbackHost); |
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} |
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} |
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return $retVal; |
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} |
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/** |
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* fetch file from remote destination |
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* |
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* @param RequestInterface $request request |
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* |
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* @return string |
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*/ |
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private function fetchFile($request) |
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{ |
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try { |
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$response = $request->send(); |
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} catch (\Guzzle\Http\Exception\CurlException $e) { |
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throw new HttpException( |
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Response::HTTP_BAD_GATEWAY, |
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$e->getError(), |
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$e, |
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$e->getRequest()->getHeaders()->toArray(), |
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$e->getCode() |
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); |
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} |
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$content = $response->getBody(true); |
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if (isset($this->cacheStrategy)) { |
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$this->cacheStrategy->save($this->options['storeKey'], $content); |
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} |
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return $content; |
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} |
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} |
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libgraviton /
graviton
