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/S3/

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Current File : /home/stando/www/wp-content/plugins/w3-total-cache/lib/Aws/Aws/S3/S3UriParser.php
<?php
namespace Aws\S3;

use GuzzleHttp\Psr7;
use Psr\Http\Message\UriInterface;

/**
 * Extracts a region, bucket, key, and and if a URI is in path-style
 */
class S3UriParser
{
    private $pattern = '/^(.+\\.)?s3[.-]([A-Za-z0-9-]+)\\./';
    private $streamWrapperScheme = 's3';

    private static $defaultResult = [
        'path_style' => true,
        'bucket'     => null,
        'key'        => null,
        'region'     => null
    ];

    /**
     * Parses a URL or S3 StreamWrapper Uri (s3://) into an associative array
     * of Amazon S3 data including:
     *
     * - bucket: The Amazon S3 bucket (null if none)
     * - key: The Amazon S3 key (null if none)
     * - path_style: Set to true if using path style, or false if not
     * - region: Set to a string if a non-class endpoint is used or null.
     *
     * @param string|UriInterface $uri
     *
     * @return array
     * @throws \InvalidArgumentException
     */
    public function parse($uri)
    {
        $url = Psr7\uri_for($uri);

        if ($url->getScheme() == $this->streamWrapperScheme) {
            return $this->parseStreamWrapper($url);
        }

        if (!$url->getHost()) {
            throw new \InvalidArgumentException('No hostname found in URI: '
                . $uri);
        }

        if (!preg_match($this->pattern, $url->getHost(), $matches)) {
            return $this->parseCustomEndpoint($url);
        }

        // Parse the URI based on the matched format (path / virtual)
        $result = empty($matches[1])
            ? $this->parsePathStyle($url)
            : $this->parseVirtualHosted($url, $matches);

        // Add the region if one was found and not the classic endpoint
        $result['region'] = $matches[2] == 'amazonaws' ? null : $matches[2];

        return $result;
    }

    private function parseStreamWrapper(UriInterface $url)
    {
        $result = self::$defaultResult;
        $result['path_style'] = false;

        $result['bucket'] = $url->getHost();
        if ($url->getPath()) {
            $key = ltrim($url->getPath(), '/ ');
            if (!empty($key)) {
                $result['key'] = $key;
            }
        }

        return $result;
    }

    private function parseCustomEndpoint(UriInterface $url)
    {
        $result = self::$defaultResult;
        $path = ltrim($url->getPath(), '/ ');
        $segments = explode('/', $path, 2);

        if (isset($segments[0])) {
            $result['bucket'] = $segments[0];
            if (isset($segments[1])) {
                $result['key'] = $segments[1];
            }
        }

        return $result;
    }

    private function parsePathStyle(UriInterface $url)
    {
        $result = self::$defaultResult;

        if ($url->getPath() != '/') {
            $path = ltrim($url->getPath(), '/');
            if ($path) {
                $pathPos = strpos($path, '/');
                if ($pathPos === false) {
                    // https://s3.amazonaws.com/bucket
                    $result['bucket'] = $path;
                } elseif ($pathPos == strlen($path) - 1) {
                    // https://s3.amazonaws.com/bucket/
                    $result['bucket'] = substr($path, 0, -1);
                } else {
                    // https://s3.amazonaws.com/bucket/key
                    $result['bucket'] = substr($path, 0, $pathPos);
                    $result['key'] = substr($path, $pathPos + 1) ?: null;
                }
            }
        }

        return $result;
    }

    private function parseVirtualHosted(UriInterface $url, array $matches)
    {
        $result = self::$defaultResult;
        $result['path_style'] = false;
        // Remove trailing "." from the prefix to get the bucket
        $result['bucket'] = substr($matches[1], 0, -1);
        $path = $url->getPath();
        // Check if a key was present, and if so, removing the leading "/"
        $result['key'] = !$path || $path == '/' ? null : substr($path, 1);

        return $result;
    }
}

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