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