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<?php |
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/** |
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* TRequestConnectionUpgrade class file. |
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* |
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* @author Brad Anderson <[email protected]> |
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* @link https://github.com/pradosoft/prado |
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* @license https://github.com/pradosoft/prado/blob/master/LICENSE |
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*/ |
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namespace Prado\Web\Behaviors; |
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use Prado\Prado; |
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/** |
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* TRequestConnectionUpgrade class. |
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* |
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* This is a behavior for {@see THttpRequest} that adds the "Connection: Upgrade" |
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* header "Upgrade: <service>" to the URL Parameters of the request. |
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* |
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* For example, a URL parameter could be used to select the PRADO "websocket" service. |
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* But this class allows selection of the "websocket" service from the injection of the |
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* "Upgrade" HTTP headers into the URL parameters without the need for specifying |
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* URL parameters. |
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* |
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* ```xml |
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* <behavior name="httpUpgrader" Class="Prado\Web\Behaviors\TRequestConnectionUpgrade" AttachToClass="Prado\Web\THttpRequest" /> |
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* ``` |
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* |
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* @author Brad Anderson <[email protected]> |
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* @since 4.2.3 |
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*/ |
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class TRequestConnectionUpgrade extends \Prado\Util\TBehavior |
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{ |
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public function events() |
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{ |
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return ['onResolveRequest' => 'processHeaders']; |
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} |
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/** |
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* Move the contents of the Upgrade header to the urlParams. |
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* The Service can select on the "Upgrade" HTTP header like "websocket". |
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* @param \Prado\Web\THttpRequest $request |
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* @param \Prado\Web\THttpRequestParameter $param |
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*/ |
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public function processHeaders($request, $param) |
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{ |
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$urlParams = $param->getParameter(); |
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if (!is_array($urlParams)) { |
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return; |
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} |
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$headers = $request->getHeaders(CASE_LOWER); |
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if (!isset($headers['connection'])) { |
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return; |
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} |
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$connections = array_map('trim', explode(',', strtolower($headers['connection']))); |
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if (!in_array('upgrade', $connections)) { |
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return; |
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} |
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if (!isset($headers['upgrade'])) { |
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Prado::log("'Connection: Upgrade' without 'Upgrade' Header from " . $_SERVER['REMOTE_ADDR'], \Prado\Util\TLogger::NOTICE, static::class); |
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return; |
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} |
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$upgrade = $headers['upgrade']; |
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if (is_array($upgrade)) { |
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$upgrade = implode(',', $upgrade); |
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} |
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$requestedUpgrade = array_map('trim', explode(',', $upgrade)); |
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if ($requestedUpgrade) { |
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$urlParams = array_merge(array_flip($requestedUpgrade), $urlParams); |
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$param->setParameter($urlParams); // Forward results |
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return $urlParams; // return for use |
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} |
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} |
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} |
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pradosoft /
prado
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.