Util.php

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<?php

namespace League\Flysystem;

use League\Flysystem\Util\MimeType;
use LogicException;

class Util
{
    public static function pathinfo($path)
    {
        $pathinfo = pathinfo($path) + compact('path');
        $pathinfo['dirname'] = array_key_exists('dirname', $pathinfo)
            ? static::normalizeDirname($pathinfo['dirname']) : '';

        return $pathinfo;
    }

    public static function normalizeDirname($dirname)
    {
        return $dirname === '.' ? '' : $dirname;
    }

    public static function dirname($path)
    {
        return static::normalizeDirname(dirname($path));
    }

    public static function map(array $object, array $map)
    {
        $result = [];

        foreach ($map as $from => $to) {
            if ( ! isset($object[$from])) {
                continue;
            }

            $result[$to] = $object[$from];
        }

        return $result;
    }

    public static function normalizePath($path)
    {
        return static::normalizeRelativePath($path);
    }

    public static function normalizeRelativePath($path)
    {
        $path = str_replace('\\', '/', $path);
        $path = static::removeFunkyWhiteSpace($path);

        $parts = [];

        foreach (explode('/', $path) as $part) {
            switch ($part) {
                case '':
                case '.':
                break;

            case '..':
                if (empty($parts)) {
                    throw new LogicException(
                        'Path is outside of the defined root, path: [' . $path . ']'
                    );
                }
                array_pop($parts);
                break;

            default:
                $parts[] = $part;
                break;
            }
        }

        return implode('/', $parts);
    }

    protected static function removeFunkyWhiteSpace($path) {
        // We do this check in a loop, since removing invalid unicode characters
        // can lead to new characters being created.
        while (preg_match('#\p{C}+|^\./#u', $path)) {
            $path = preg_replace('#\p{C}+|^\./#u', '', $path);
        }

        return $path;
    }

    public static function normalizePrefix($prefix, $separator)
    {
        return rtrim($prefix, $separator) . $separator;
    }

    public static function contentSize($contents)
    {
        return defined('MB_OVERLOAD_STRING') ? mb_strlen($contents, '8bit') : strlen($contents);
    }

    public static function guessMimeType($path, $content)
    {
        $mimeType = MimeType::detectByContent($content);

        if ( ! (empty($mimeType) || in_array($mimeType, ['application/x-empty', 'text/plain', 'text/x-asm']))) {
            return $mimeType;
        }

        return MimeType::detectByFilename($path);
    }

    public static function emulateDirectories(array $listing)
    {
        $directories = [];
        $listedDirectories = [];

        foreach ($listing as $object) {
            list($directories, $listedDirectories) = static::emulateObjectDirectories(
                $object,
                $directories,
                $listedDirectories
            );
        }

        $directories = array_diff(array_unique($directories), array_unique($listedDirectories));

        foreach ($directories as $directory) {
            $listing[] = static::pathinfo($directory) + ['type' => 'dir'];
        }

        return $listing;
    }

    public static function ensureConfig($config)
    {
        if ($config === null) {
            return new Config();
        }

        if ($config instanceof Config) {
            return $config;
        }

        if (is_array($config)) {
            return new Config($config);
        }

        throw new LogicException('A config should either be an array or a Flysystem\Config object.');
    }

    public static function rewindStream($resource)
    {
        if (ftell($resource) !== 0 && static::isSeekableStream($resource)) {
            rewind($resource);
        }
    }

    public static function isSeekableStream($resource)
    {
        $metadata = stream_get_meta_data($resource);

        return $metadata['seekable'];
    }

    public static function getStreamSize($resource)
    {
        $stat = fstat($resource);

        return $stat['size'];
    }

    protected static function emulateObjectDirectories(array $object, array $directories, array $listedDirectories)
    {
        if ($object['type'] === 'dir') {
            $listedDirectories[] = $object['path'];
        }

        if (empty($object['dirname'])) {
            return [$directories, $listedDirectories];
        }

        $parent = $object['dirname'];

        while ( ! empty($parent) && ! in_array($parent, $directories)) {
            $directories[] = $parent;
            $parent = static::dirname($parent);
        }

        if (isset($object['type']) && $object['type'] === 'dir') {
            $listedDirectories[] = $object['path'];

            return [$directories, $listedDirectories];
        }

        return [$directories, $listedDirectories];
    }
}