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<?php |
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/** |
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* Class URLExtractor |
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* |
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* @created 15.08.2019 |
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* @author smiley <[email protected]> |
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* @copyright 2019 smiley |
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* @license MIT |
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*/ |
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namespace chillerlan\HTTP\Psr18; |
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use chillerlan\HTTP\Psr17\RequestFactory; |
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use Psr\Http\Client\ClientInterface; |
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use Psr\Http\Message\{RequestFactoryInterface, RequestInterface, ResponseInterface, UriInterface}; |
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use function array_key_last; |
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use function array_pop; |
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use function count; |
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use function in_array; |
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/** |
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* A client that follows redirects until it reaches a non-30x response, e.g. to extract shortened URLs |
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* |
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* The given HTTP client needs to be set up accordingly: |
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* |
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* - CURLOPT_FOLLOWLOCATION must be set to false so that we can intercept the 30x responses |
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* - CURLOPT_MAXREDIRS should be set to a value > 1 |
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*/ |
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class URLExtractor implements ClientInterface{ |
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/** @var \Psr\Http\Message\ResponseInterface[] */ |
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protected array $responses = []; |
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protected ClientInterface $http; |
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protected RequestFactoryInterface $requestFactory; |
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/** |
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* URLExtractor constructor. |
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*/ |
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public function __construct(ClientInterface $http, RequestFactoryInterface $requestFactory = null){ |
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$this->http = $http; |
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$this->requestFactory = $requestFactory ?? new RequestFactory; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function sendRequest(RequestInterface $request):ResponseInterface{ |
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do{ |
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// fetch the response for the current request |
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$response = $this->http->sendRequest($request); |
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$this->responses[] = $response; |
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// set up a new request to the location header of the last response |
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$request = $this->requestFactory->createRequest($request->getMethod(), $response->getHeaderLine('location')); |
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} |
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while(in_array($response->getStatusCode(), [301, 302, 303, 307, 308], true)); |
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return $response; |
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} |
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/** |
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* extract the given URL and return the last valid location header |
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*/ |
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public function extract(UriInterface|string $shortURL):?string{ |
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$request = $this->requestFactory->createRequest('GET', $shortURL); |
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$response = $this->sendRequest($request); |
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if($response->getStatusCode() !== 200 || empty($this->responses)){ |
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return null; |
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} |
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$count = count($this->responses) - 2; |
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while($count >= 0){ |
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$url = $this->responses[$count]?->getHeaderLine('location'); |
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if(!empty($url)){ |
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return $url; |
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} |
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$count--; |
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} |
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return null; |
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} |
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/** |
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* @return \Psr\Http\Message\ResponseInterface[] |
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*/ |
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public function getResponses():array{ |
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return $this->responses; |
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} |
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} |
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chillerlan /
php-httpinterface
