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<?php
namespace Aws;
use Aws\Api\Service;
use Psr\Http\Message\RequestInterface;
use Psr\Log\InvalidArgumentException;
/**
* Used to update the host based on a modeled endpoint trait
*
* IMPORTANT: this middleware must be added after the "build" step.
*
* @internal
*/
class EndpointParameterMiddleware
{
/** @var callable */
private $nextHandler;
/** @var Service */
private $service;
/**
* Create a middleware wrapper function
*
* @param Service $service
* @param array $args
* @return \Closure
*/
public static function wrap(Service $service)
{
return function (callable $handler) use ($service) {
return new self($handler, $service);
};
}
public function __construct(callable $nextHandler, Service $service)
{
$this->nextHandler = $nextHandler;
$this->service = $service;
}
public function __invoke(CommandInterface $command, RequestInterface $request)
{
$nextHandler = $this->nextHandler;
$operation = $this->service->getOperation($command->getName());
if (!empty($operation['endpoint']['hostPrefix'])) {
$prefix = $operation['endpoint']['hostPrefix'];
// Captures endpoint parameters stored in the modeled host.
// These are denoted by enclosure in braces, i.e. '{param}'
preg_match_all("/\{([a-zA-Z0-9]+)}/", $prefix, $parameters);
if (!empty($parameters[1])) {
// Captured parameters without braces stored in $parameters[1],
// which should correspond to members in the Command object
foreach ($parameters[1] as $index => $parameter) {
if (empty($command[$parameter])) {
throw new \InvalidArgumentException(
"The parameter '{$parameter}' must be set and not empty."
);
}
// Captured parameters with braces stored in $parameters[0],
// which are replaced by their corresponding Command value
$prefix = str_replace(
$parameters[0][$index],
$command[$parameter],
$prefix
);
}
}
$uri = $request->getUri();
$host = $prefix . $uri->getHost();
if (!\Aws\is_valid_hostname($host)) {
throw new \InvalidArgumentException(
"The supplied parameters result in an invalid hostname: '{$host}'."
);
}
$request = $request->withUri($uri->withHost($host));
}
return $nextHandler($command, $request);
}
}