晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : /home/stando/www/wp-content/plugins/w3-total-cache/lib/Aws/Aws/EndpointParameterMiddleware.php
<?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
{

    /**
     * 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);
    }
}

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