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/public_html/wp-content/plugins/w3-total-cache/lib/Aws/Aws/S3/SSECMiddleware.php
<?php
namespace Aws\S3;

use Aws\CommandInterface;
use Psr\Http\Message\RequestInterface;

/**
 * Simplifies the SSE-C process by encoding and hashing the key.
 * @internal
 */
class SSECMiddleware
{
    private $endpointScheme;
    private $nextHandler;

    /**
     * Provide the URI scheme of the client sending requests.
     *
     * @param string $endpointScheme URI scheme (http/https).
     *
     * @return callable
     */
    public static function wrap($endpointScheme)
    {
        return function (callable $handler) use ($endpointScheme) {
            return new self($endpointScheme, $handler);
        };
    }

    public function __construct($endpointScheme, callable $nextHandler)
    {
        $this->nextHandler = $nextHandler;
        $this->endpointScheme = $endpointScheme;
    }

    public function __invoke(
        CommandInterface $command,
        RequestInterface $request = null
    ) {
        // Allows only HTTPS connections when using SSE-C
        if (($command['SSECustomerKey'] || $command['CopySourceSSECustomerKey'])
            && $this->endpointScheme !== 'https'
        ) {
            throw new \RuntimeException('You must configure your S3 client to '
                . 'use HTTPS in order to use the SSE-C features.');
        }

        // Prepare the normal SSE-CPK headers
        if ($command['SSECustomerKey']) {
            $this->prepareSseParams($command);
        }

        // If it's a copy operation, prepare the SSE-CPK headers for the source.
        if ($command['CopySourceSSECustomerKey']) {
            $this->prepareSseParams($command, 'CopySource');
        }

        $f = $this->nextHandler;
        return $f($command, $request);
    }

    private function prepareSseParams(CommandInterface $command, $prefix = '')
    {
        // Base64 encode the provided key
        $key = $command[$prefix . 'SSECustomerKey'];
        $command[$prefix . 'SSECustomerKey'] = base64_encode($key);

        // Base64 the provided MD5 or, generate an MD5 if not provided
        if ($md5 = $command[$prefix . 'SSECustomerKeyMD5']) {
            $command[$prefix . 'SSECustomerKeyMD5'] = base64_encode($md5);
        } else {
            $command[$prefix . 'SSECustomerKeyMD5'] = base64_encode(md5($key, true));
        }
    }
}

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