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<?php |
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namespace LegalThings\DataEnricher\Processor; |
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use LegalThings\DataEnricher\Node; |
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use LegalThings\DataEnricher\Processor; |
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use GuzzleHttp\Client; |
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use GuzzleHttp\Psr7\Response; |
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/** |
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* Load an external source |
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*/ |
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class Http implements Processor |
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{ |
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use Processor\Implementation; |
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/** |
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* Get the URL from a node |
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* |
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* @param Node $node |
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* @return string |
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*/ |
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protected function getUrl($node) |
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{ |
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$url = $node->getInstruction($this); |
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$type = (is_object($url) ? get_class($url) . ' ' : '') . gettype($url); |
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if (!assert(is_string($url), "Expected '{$this->property}' to be a string, but got a $type")) { |
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return null; |
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} |
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return $url; |
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} |
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/** |
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* Do async request for node |
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* |
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* @param Node $node |
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*/ |
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public function applyToNode(Node $node) |
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{ |
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$url = $this->getUrl($node); |
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if (!isset($url)) { |
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return; |
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} |
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$client = new Client(['http_errors' => false]); |
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$promise = $client->getAsync($url)->then(function (Response $response) use ($node) { |
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$this->applyResult($node, $response); |
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}); |
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$node->setResult($promise); |
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} |
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/** |
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* Apply results to a node |
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* |
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* @param Node $node |
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* @param Response $response |
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*/ |
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protected function applyResult(Node $node, Response $response) |
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{ |
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$result = null; |
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if ($this->hasExpectedResponse($node, $response)) { |
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$result = json_decode($response->getBody()); |
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if (!$result) { |
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$url = $this->getUrl($node); |
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trigger_error("Failed to fetch '$url': Corrupt JSON response", E_USER_WARNING); |
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} |
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} |
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$node->setResult($result); |
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} |
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/** |
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* Check if we got an expected response |
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* |
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* @param Node $node |
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* @param Response $response |
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* @return boolean |
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*/ |
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protected function hasExpectedResponse(Node $node, Response $response) |
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{ |
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$status = $response->getStatusCode(); |
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$contentType = preg_replace('/\s*;.*$/', '', $response->getHeaderLine('Content-Type')); |
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if ($status >= 300 || !in_array($contentType, ['application/json', 'text/plain'])) { |
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$url = $this->getUrl($node); |
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if ($contentType === 'text/plain') { |
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$message = $response->getBody(); |
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} else { |
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$message = "Server responded with a $status status and $contentType"; |
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} |
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trigger_error("Failed to fetch '$url': $message", E_USER_WARNING); |
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return false; |
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} |
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return true; |
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} |
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} |
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legalthings /
data-enricher
