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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Directory :  /home/stando/www/wp-content/plugins/w3-total-cache/lib/Aws/Aws/Signature/

Upload File :
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Current File : /home/stando/www/wp-content/plugins/w3-total-cache/lib/Aws/Aws/Signature/S3SignatureV4.php
<?php
namespace Aws\Signature;

use Aws\Credentials\CredentialsInterface;
use Psr\Http\Message\RequestInterface;

/**
 * Amazon S3 signature version 4 support.
 */
class S3SignatureV4 extends SignatureV4
{
    /**
     * Always add a x-amz-content-sha-256 for data integrity.
     */
    public function signRequest(
        RequestInterface $request,
        CredentialsInterface $credentials
    ) {
        if (!$request->hasHeader('x-amz-content-sha256')) {
            $request = $request->withHeader(
                'X-Amz-Content-Sha256',
                $this->getPayload($request)
            );
        }

        return parent::signRequest($request, $credentials);
    }

    /**
     * Always add a x-amz-content-sha-256 for data integrity.
     */
    public function presign(
        RequestInterface $request,
        CredentialsInterface $credentials,
        $expires,
        array $options = []
    ) {
        if (!$request->hasHeader('x-amz-content-sha256')) {
            $request = $request->withHeader(
                'X-Amz-Content-Sha256',
                $this->getPresignedPayload($request)
            );
        }

        return parent::presign($request, $credentials, $expires, $options);
    }

    /**
     * Override used to allow pre-signed URLs to be created for an
     * in-determinate request payload.
     */
    protected function getPresignedPayload(RequestInterface $request)
    {
        return SignatureV4::UNSIGNED_PAYLOAD;
    }

    /**
     * Amazon S3 does not double-encode the path component in the canonical request
     */
    protected function createCanonicalizedPath($path)
    {
        // Only remove one slash in case of keys that have a preceding slash
        if (substr($path, 0, 1) === '/') {
            $path = substr($path, 1);
        }
        return '/' . $path;
    }
}

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