<?php

namespace DeliciousBrains\WP_Offload_Media\Aws3\Aws\S3;

use DeliciousBrains\WP_Offload_Media\Aws3\Aws\CacheInterface;
use DeliciousBrains\WP_Offload_Media\Aws3\Aws\LruArrayCache;
use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Result;
use DeliciousBrains\WP_Offload_Media\Aws3\Aws\S3\Exception\S3Exception;
use DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Psr7;
use DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Psr7\Stream;
use DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Psr7\CachingStream;
use DeliciousBrains\WP_Offload_Media\Aws3\Psr\Http\Message\StreamInterface;
/**
 * Amazon S3 stream wrapper to use "s3://<bucket>/<key>" files with PHP
 * streams, supporting "r", "w", "a", "x".
 *
 * # Opening "r" (read only) streams:
 *
 * Read only streams are truly streaming by default and will not allow you to
 * seek. This is because data read from the stream is not kept in memory or on
 * the local filesystem. You can force a "r" stream to be seekable by setting
 * the "seekable" stream context option true. This will allow true streaming of
 * data from Amazon S3, but will maintain a buffer of previously read bytes in
 * a 'php://temp' stream to allow seeking to previously read bytes from the
 * stream.
 *
 * You may pass any GetObject parameters as 's3' stream context options. These
 * options will affect how the data is downloaded from Amazon S3.
 *
 * # Opening "w" and "x" (write only) streams:
 *
 * Because Amazon S3 requires a Content-Length header, write only streams will
 * maintain a 'php://temp' stream to buffer data written to the stream until
 * the stream is flushed (usually by closing the stream with fclose).
 *
 * You may pass any PutObject parameters as 's3' stream context options. These
 * options will affect how the data is uploaded to Amazon S3.
 *
 * When opening an "x" stream, the file must exist on Amazon S3 for the stream
 * to open successfully.
 *
 * # Opening "a" (write only append) streams:
 *
 * Similar to "w" streams, opening append streams requires that the data be
 * buffered in a "php://temp" stream. Append streams will attempt to download
 * the contents of an object in Amazon S3, seek to the end of the object, then
 * allow you to append to the contents of the object. The data will then be
 * uploaded using a PutObject operation when the stream is flushed (usually
 * with fclose).
 *
 * You may pass any GetObject and/or PutObject parameters as 's3' stream
 * context options. These options will affect how the data is downloaded and
 * uploaded from Amazon S3.
 *
 * Stream context options:
 *
 * - "seekable": Set to true to create a seekable "r" (read only) stream by
 *   using a php://temp stream buffer
 * - For "unlink" only: Any option that can be passed to the DeleteObject
 *   operation
 */
class StreamWrapper
{
    /** @var resource|null Stream context (this is set by PHP) */
    public $context;
    /** @var StreamInterface Underlying stream resource */
    private $body;
    /** @var int Size of the body that is opened */
    private $size;
    /** @var array Hash of opened stream parameters */
    private $params = [];
    /** @var string Mode in which the stream was opened */
    private $mode;
    /** @var \Iterator Iterator used with opendir() related calls */
    private $objectIterator;
    /** @var string The bucket that was opened when opendir() was called */
    private $openedBucket;
    /** @var string The prefix of the bucket that was opened with opendir() */
    private $openedBucketPrefix;
    /** @var string Opened bucket path */
    private $openedPath;
    /** @var CacheInterface Cache for object and dir lookups */
    private $cache;
    /** @var string The opened protocol (e.g., "s3") */
    private $protocol = 's3';
    /** @var bool Keeps track of whether stream has been flushed since opening */
    private $isFlushed = \false;
    /** @var bool Whether or not to use V2 bucket and object existence methods */
    private static $useV2Existence = \false;
    /**
     * Register the 's3://' stream wrapper
     *
     * @param S3ClientInterface $client   Client to use with the stream wrapper
     * @param string            $protocol Protocol to register as.
     * @param CacheInterface    $cache    Default cache for the protocol.
     */
    public static function register(S3ClientInterface $client, $protocol = 's3', ?CacheInterface $cache = null, $v2Existence = \false)
    {
        self::$useV2Existence = $v2Existence;
        if (\in_array($protocol, \stream_get_wrappers())) {
            \stream_wrapper_unregister($protocol);
        }
        // Set the client passed in as the default stream context client
        \stream_wrapper_register($protocol, \get_called_class(), \STREAM_IS_URL);
        $default = \stream_context_get_options(\stream_context_get_default());
        $default[$protocol]['client'] = $client;
        if ($cache) {
            $default[$protocol]['cache'] = $cache;
        } elseif (!isset($default[$protocol]['cache'])) {
            // Set a default cache adapter.
            $default[$protocol]['cache'] = new LruArrayCache();
        }
        \stream_context_set_default($default);
    }
    public function stream_close()
    {
        if (!$this->isFlushed && empty($this->body->getSize()) && $this->mode !== 'r') {
            $this->stream_flush();
        }
        $this->body = $this->cache = null;
    }
    public function stream_open($path, $mode, $options, &$opened_path)
    {
        $this->initProtocol($path);
        $this->isFlushed = \false;
        $this->params = $this->getBucketKey($path);
        $this->mode = \rtrim($mode, 'bt');
        if ($errors = $this->validate($path, $this->mode)) {
            return $this->triggerError($errors);
        }
        return $this->boolCall(function () {
            switch ($this->mode) {
                case 'r':
                    return $this->openReadStream();
                case 'a':
                    return $this->openAppendStream();
                default:
                    return $this->openWriteStream();
            }
        });
    }
    public function stream_eof()
    {
        return $this->body->eof();
    }
    public function stream_flush()
    {
        // Check if stream body size has been
        // calculated via a flush or close
        if ($this->body->getSize() === null && $this->mode !== 'r') {
            return $this->triggerError("Unable to determine stream size. Did you forget to close or flush the stream?");
        }
        $this->isFlushed = \true;
        if ($this->mode == 'r') {
            return \false;
        }
        if ($this->body->isSeekable()) {
            $this->body->seek(0);
        }
        $params = $this->getOptions(\true);
        $params['Body'] = $this->body;
        // Attempt to guess the ContentType of the upload based on the
        // file extension of the key
        if (!isset($params['ContentType']) && ($type = Psr7\MimeType::fromFilename($params['Key']))) {
            $params['ContentType'] = $type;
        }
        $this->clearCacheKey("{$this->protocol}://{$params['Bucket']}/{$params['Key']}");
        return $this->boolCall(function () use($params) {
            return (bool) $this->getClient()->putObject($params);
        });
    }
    public function stream_read($count)
    {
        return $this->body->read($count);
    }
    public function stream_seek($offset, $whence = \SEEK_SET)
    {
        return !$this->body->isSeekable() ? \false : $this->boolCall(function () use($offset, $whence) {
            $this->body->seek($offset, $whence);
            return \true;
        });
    }
    public function stream_tell()
    {
        return $this->boolCall(function () {
            return $this->body->tell();
        });
    }
    public function stream_write($data)
    {
        return $this->body->write($data);
    }
    public function unlink($path)
    {
        $this->initProtocol($path);
        return $this->boolCall(function () use($path) {
            $this->clearCacheKey($path);
            $this->getClient()->deleteObject($this->withPath($path));
            return \true;
        });
    }
    public function stream_stat()
    {
        $stat = $this->getStatTemplate();
        $stat[7] = $stat['size'] = $this->getSize();
        $stat[2] = $stat['mode'] = $this->mode;
        return $stat;
    }
    /**
     * Provides information for is_dir, is_file, filesize, etc. Works on
     * buckets, keys, and prefixes.
     * @link http://www.php.net/manual/en/streamwrapper.url-stat.php
     */
    public function url_stat($path, $flags)
    {
        $this->initProtocol($path);
        // Some paths come through as S3:// for some reason.
        $split = \explode('://', $path, 2);
        $path = \strtolower($split[0]) . '://' . $split[1];
        // Check if this path is in the url_stat cache
        if ($value = $this->getCacheStorage()->get($path)) {
            return $value;
        }
        $stat = $this->createStat($path, $flags);
        if (\is_array($stat)) {
            $this->getCacheStorage()->set($path, $stat);
        }
        return $stat;
    }
    /**
     * Parse the protocol out of the given path.
     *
     * @param $path
     */
    private function initProtocol($path)
    {
        $parts = \explode('://', $path, 2);
        $this->protocol = $parts[0] ?: 's3';
    }
    private function createStat($path, $flags)
    {
        $this->initProtocol($path);
        $parts = $this->withPath($path);
        if (!$parts['Key']) {
            return $this->statDirectory($parts, $path, $flags);
        }
        return $this->boolCall(function () use($parts, $path) {
            try {
                $result = $this->getClient()->headObject($parts);
                if (\substr($parts['Key'], -1, 1) == '/' && $result['ContentLength'] == 0) {
                    // Return as if it is a bucket to account for console
                    // bucket objects (e.g., zero-byte object "foo/")
                    return $this->formatUrlStat($path);
                }
                // Attempt to stat and cache regular object
                return $this->formatUrlStat($result->toArray());
            } catch (S3Exception $e) {
                // Maybe this isn't an actual key, but a prefix. Do a prefix
                // listing of objects to determine.
                $result = $this->getClient()->listObjects(['Bucket' => $parts['Bucket'], 'Prefix' => \rtrim($parts['Key'], '/') . '/', 'MaxKeys' => 1]);
                if (!$result['Contents'] && !$result['CommonPrefixes']) {
                    throw new \Exception("File or directory not found: {$path}");
                }
                return $this->formatUrlStat($path);
            }
        }, $flags);
    }
    private function statDirectory($parts, $path, $flags)
    {
        // Stat "directories": buckets, or "s3://"
        $method = self::$useV2Existence ? 'doesBucketExistV2' : 'doesBucketExist';
        if (!$parts['Bucket'] || $this->getClient()->{$method}($parts['Bucket'])) {
            return $this->formatUrlStat($path);
        }
        return $this->triggerError("File or directory not found: {$path}", $flags);
    }
    /**
     * Support for mkdir().
     *
     * @param string $path    Directory which should be created.
     * @param int    $mode    Permissions. 700-range permissions map to
     *                        ACL_PUBLIC. 600-range permissions map to
     *                        ACL_AUTH_READ. All other permissions map to
     *                        ACL_PRIVATE. Expects octal form.
     * @param int    $options A bitwise mask of values, such as
     *                        STREAM_MKDIR_RECURSIVE.
     *
     * @return bool
     * @link http://www.php.net/manual/en/streamwrapper.mkdir.php
     */
    public function mkdir($path, $mode, $options)
    {
        $this->initProtocol($path);
        $params = $this->withPath($path);
        $this->clearCacheKey($path);
        if (!$params['Bucket']) {
            return \false;
        }
        if (!isset($params['ACL'])) {
            $params['ACL'] = $this->determineAcl($mode);
        }
        return empty($params['Key']) ? $this->createBucket($path, $params) : $this->createSubfolder($path, $params);
    }
    public function rmdir($path, $options)
    {
        $this->initProtocol($path);
        $this->clearCacheKey($path);
        $params = $this->withPath($path);
        $client = $this->getClient();
        if (!$params['Bucket']) {
            return $this->triggerError('You must specify a bucket');
        }
        return $this->boolCall(function () use($params, $path, $client) {
            if (!$params['Key']) {
                $client->deleteBucket(['Bucket' => $params['Bucket']]);
                return \true;
            }
            return $this->deleteSubfolder($path, $params);
        });
    }
    /**
     * Support for opendir().
     *
     * The opendir() method of the Amazon S3 stream wrapper supports a stream
     * context option of "listFilter". listFilter must be a callable that
     * accepts an associative array of object data and returns true if the
     * object should be yielded when iterating the keys in a bucket.
     *
     * @param string $path    The path to the directory
     *                        (e.g. "s3://dir[</prefix>]")
     * @param string $options Unused option variable
     *
     * @return bool true on success
     * @see http://www.php.net/manual/en/function.opendir.php
     */
    public function dir_opendir($path, $options)
    {
        $this->initProtocol($path);
        $this->openedPath = $path;
        $params = $this->withPath($path);
        $delimiter = $this->getOption('delimiter');
        /** @var callable $filterFn */
        $filterFn = $this->getOption('listFilter');
        $op = ['Bucket' => $params['Bucket']];
        $this->openedBucket = $params['Bucket'];
        if ($delimiter === null) {
            $delimiter = '/';
        }
        if ($delimiter) {
            $op['Delimiter'] = $delimiter;
        }
        if ($params['Key']) {
            $params['Key'] = \rtrim($params['Key'], $delimiter) . $delimiter;
            $op['Prefix'] = $params['Key'];
        }
        $this->openedBucketPrefix = $params['Key'];
        // Filter our "/" keys added by the console as directories, and ensure
        // that if a filter function is provided that it passes the filter.
        $this->objectIterator = \DeliciousBrains\WP_Offload_Media\Aws3\Aws\flatmap($this->getClient()->getPaginator('ListObjects', $op), function (Result $result) use($filterFn) {
            $contentsAndPrefixes = $result->search('[Contents[], CommonPrefixes[]][]');
            // Filter out dir place holder keys and use the filter fn.
            return \array_filter($contentsAndPrefixes, function ($key) use($filterFn) {
                return (!$filterFn || \call_user_func($filterFn, $key)) && (!isset($key['Key']) || \substr($key['Key'], -1, 1) !== '/');
            });
        });
        return \true;
    }
    /**
     * Close the directory listing handles
     *
     * @return bool true on success
     */
    public function dir_closedir()
    {
        $this->objectIterator = null;
        \gc_collect_cycles();
        return \true;
    }
    /**
     * This method is called in response to rewinddir()
     *
     * @return boolean true on success
     */
    public function dir_rewinddir()
    {
        return $this->boolCall(function () {
            $this->objectIterator = null;
            $this->dir_opendir($this->openedPath, null);
            return \true;
        });
    }
    /**
     * This method is called in response to readdir()
     *
     * @return string Should return a string representing the next filename, or
     *                false if there is no next file.
     * @link http://www.php.net/manual/en/function.readdir.php
     */
    public function dir_readdir()
    {
        // Skip empty result keys
        if (!$this->objectIterator->valid()) {
            return \false;
        }
        // First we need to create a cache key. This key is the full path to
        // then object in s3: protocol://bucket/key.
        // Next we need to create a result value. The result value is the
        // current value of the iterator without the opened bucket prefix to
        // emulate how readdir() works on directories.
        // The cache key and result value will depend on if this is a prefix
        // or a key.
        $cur = $this->objectIterator->current();
        if (isset($cur['Prefix'])) {
            // Include "directories". Be sure to strip a trailing "/"
            // on prefixes.
            $result = \rtrim($cur['Prefix'], '/');
            $key = $this->formatKey($result);
            $stat = $this->formatUrlStat($key);
        } else {
            $result = $cur['Key'];
            $key = $this->formatKey($cur['Key']);
            $stat = $this->formatUrlStat($cur);
        }
        // Cache the object data for quick url_stat lookups used with
        // RecursiveDirectoryIterator.
        $this->getCacheStorage()->set($key, $stat);
        $this->objectIterator->next();
        // Remove the prefix from the result to emulate other stream wrappers.
        return $this->openedBucketPrefix ? \substr($result, \strlen($this->openedBucketPrefix)) : $result;
    }
    private function formatKey($key)
    {
        $protocol = \explode('://', $this->openedPath)[0];
        return "{$protocol}://{$this->openedBucket}/{$key}";
    }
    /**
     * Called in response to rename() to rename a file or directory. Currently
     * only supports renaming objects.
     *
     * @param string $path_from the path to the file to rename
     * @param string $path_to   the new path to the file
     *
     * @return bool true if file was successfully renamed
     * @link http://www.php.net/manual/en/function.rename.php
     */
    public function rename($path_from, $path_to)
    {
        // PHP will not allow rename across wrapper types, so we can safely
        // assume $path_from and $path_to have the same protocol
        $this->initProtocol($path_from);
        $partsFrom = $this->withPath($path_from);
        $partsTo = $this->withPath($path_to);
        $this->clearCacheKey($path_from);
        $this->clearCacheKey($path_to);
        if (!$partsFrom['Key'] || !$partsTo['Key']) {
            return $this->triggerError('The Amazon S3 stream wrapper only ' . 'supports copying objects');
        }
        return $this->boolCall(function () use($partsFrom, $partsTo) {
            $options = $this->getOptions(\true);
            // Copy the object and allow overriding default parameters if
            // desired, but by default copy metadata
            $this->getClient()->copy($partsFrom['Bucket'], $partsFrom['Key'], $partsTo['Bucket'], $partsTo['Key'], isset($options['acl']) ? $options['acl'] : 'private', $options);
            // Delete the original object
            $this->getClient()->deleteObject(['Bucket' => $partsFrom['Bucket'], 'Key' => $partsFrom['Key']] + $options);
            return \true;
        });
    }
    public function stream_cast($cast_as)
    {
        return \false;
    }
    public function stream_set_option($option, $arg1, $arg2)
    {
        return \false;
    }
    public function stream_metadata($path, $option, $value)
    {
        return \false;
    }
    public function stream_lock($operation)
    {
        \trigger_error('stream_lock() is not supported by the Amazon S3 stream wrapper', \E_USER_WARNING);
        return \false;
    }
    public function stream_truncate($new_size)
    {
        return \false;
    }
    /**
     * Validates the provided stream arguments for fopen and returns an array
     * of errors.
     */
    private function validate($path, $mode)
    {
        $errors = [];
        if (!$this->getOption('Key')) {
            $errors[] = 'Cannot open a bucket. You must specify a path in the ' . 'form of s3://bucket/key';
        }
        if (!\in_array($mode, ['r', 'w', 'a', 'x'])) {
            $errors[] = "Mode not supported: {$mode}. " . "Use one 'r', 'w', 'a', or 'x'.";
        }
        if ($mode === 'x') {
            $method = self::$useV2Existence ? 'doesObjectExistV2' : 'doesObjectExist';
            if ($this->getClient()->{$method}($this->getOption('Bucket'), $this->getOption('Key'), $this->getOptions(\true))) {
                $errors[] = "{$path} already exists on Amazon S3";
            }
        }
        return $errors;
    }
    /**
     * Get the stream context options available to the current stream
     *
     * @param bool $removeContextData Set to true to remove contextual kvp's
     *                                like 'client' from the result.
     *
     * @return array
     */
    private function getOptions($removeContextData = \false)
    {
        // Context is not set when doing things like stat
        if ($this->context === null) {
            $options = [];
        } else {
            $options = \stream_context_get_options($this->context);
            $options = isset($options[$this->protocol]) ? $options[$this->protocol] : [];
        }
        $default = \stream_context_get_options(\stream_context_get_default());
        $default = isset($default[$this->protocol]) ? $default[$this->protocol] : [];
        $result = $this->params + $options + $default;
        if ($removeContextData) {
            unset($result['client'], $result['seekable'], $result['cache']);
        }
        return $result;
    }
    /**
     * Get a specific stream context option
     *
     * @param string $name Name of the option to retrieve
     *
     * @return mixed|null
     */
    private function getOption($name)
    {
        $options = $this->getOptions();
        return isset($options[$name]) ? $options[$name] : null;
    }
    /**
     * Gets the client from the stream context
     *
     * @return S3ClientInterface
     * @throws \RuntimeException if no client has been configured
     */
    private function getClient()
    {
        if (!($client = $this->getOption('client'))) {
            throw new \RuntimeException('No client in stream context');
        }
        return $client;
    }
    private function getBucketKey($path)
    {
        // Remove the protocol
        $parts = \explode('://', $path, 2);
        // Get the bucket, key
        $parts = \explode('/', $parts[1], 2);
        return ['Bucket' => $parts[0], 'Key' => isset($parts[1]) ? $parts[1] : null];
    }
    /**
     * Get the bucket and key from the passed path (e.g. s3://bucket/key)
     *
     * @param string $path Path passed to the stream wrapper
     *
     * @return array Hash of 'Bucket', 'Key', and custom params from the context
     */
    private function withPath($path)
    {
        $params = $this->getOptions(\true);
        return $this->getBucketKey($path) + $params;
    }
    private function openReadStream()
    {
        $client = $this->getClient();
        $command = $client->getCommand('GetObject', $this->getOptions(\true));
        $command['@http']['stream'] = \true;
        $result = $client->execute($command);
        $this->size = $result['ContentLength'];
        $this->body = $result['Body'];
        // Wrap the body in a caching entity body if seeking is allowed
        if ($this->getOption('seekable') && !$this->body->isSeekable()) {
            $this->body = new CachingStream($this->body);
        }
        return \true;
    }
    private function openWriteStream()
    {
        $this->body = new Stream(\fopen('php://temp', 'r+'));
        return \true;
    }
    private function openAppendStream()
    {
        try {
            // Get the body of the object and seek to the end of the stream
            $client = $this->getClient();
            $this->body = $client->getObject($this->getOptions(\true))['Body'];
            $this->body->seek(0, \SEEK_END);
            return \true;
        } catch (S3Exception $e) {
            // The object does not exist, so use a simple write stream
            return $this->openWriteStream();
        }
    }
    /**
     * Trigger one or more errors
     *
     * @param string|array $errors Errors to trigger
     * @param mixed        $flags  If set to STREAM_URL_STAT_QUIET, then no
     *                             error or exception occurs
     *
     * @return bool Returns false
     * @throws \RuntimeException if throw_errors is true
     */
    private function triggerError($errors, $flags = null)
    {
        // This is triggered with things like file_exists()
        if ($flags & \STREAM_URL_STAT_QUIET) {
            return $flags & \STREAM_URL_STAT_LINK ? $this->formatUrlStat(\false) : \false;
        }
        // This is triggered when doing things like lstat() or stat()
        \trigger_error(\implode("\n", (array) $errors), \E_USER_WARNING);
        return \false;
    }
    /**
     * Prepare a url_stat result array
     *
     * @param string|array $result Data to add
     *
     * @return array Returns the modified url_stat result
     */
    private function formatUrlStat($result = null)
    {
        $stat = $this->getStatTemplate();
        switch (\gettype($result)) {
            case 'NULL':
            case 'string':
                // Directory with 0777 access - see "man 2 stat".
                $stat['mode'] = $stat[2] = 040777;
                break;
            case 'array':
                // Regular file with 0777 access - see "man 2 stat".
                $stat['mode'] = $stat[2] = 0100777;
                // Pluck the content-length if available.
                if (isset($result['ContentLength'])) {
                    $stat['size'] = $stat[7] = $result['ContentLength'];
                } elseif (isset($result['Size'])) {
                    $stat['size'] = $stat[7] = $result['Size'];
                }
                if (isset($result['LastModified'])) {
                    // ListObjects or HeadObject result
                    $stat['mtime'] = $stat[9] = $stat['ctime'] = $stat[10] = \strtotime($result['LastModified']);
                }
        }
        return $stat;
    }
    /**
     * Creates a bucket for the given parameters.
     *
     * @param string $path   Stream wrapper path
     * @param array  $params A result of StreamWrapper::withPath()
     *
     * @return bool Returns true on success or false on failure
     */
    private function createBucket($path, array $params)
    {
        $method = self::$useV2Existence ? 'doesBucketExistV2' : 'doesBucketExist';
        if ($this->getClient()->{$method}($params['Bucket'])) {
            return $this->triggerError("Bucket already exists: {$path}");
        }
        unset($params['ACL']);
        return $this->boolCall(function () use($params, $path) {
            $this->getClient()->createBucket($params);
            $this->clearCacheKey($path);
            return \true;
        });
    }
    /**
     * Creates a pseudo-folder by creating an empty "/" suffixed key
     *
     * @param string $path   Stream wrapper path
     * @param array  $params A result of StreamWrapper::withPath()
     *
     * @return bool
     */
    private function createSubfolder($path, array $params)
    {
        // Ensure the path ends in "/" and the body is empty.
        $params['Key'] = \rtrim($params['Key'], '/') . '/';
        $params['Body'] = '';
        // Fail if this pseudo directory key already exists
        $method = self::$useV2Existence ? 'doesObjectExistV2' : 'doesObjectExist';
        if ($this->getClient()->{$method}($params['Bucket'], $params['Key'])) {
            return $this->triggerError("Subfolder already exists: {$path}");
        }
        return $this->boolCall(function () use($params, $path) {
            $this->getClient()->putObject($params);
            $this->clearCacheKey($path);
            return \true;
        });
    }
    /**
     * Deletes a nested subfolder if it is empty.
     *
     * @param string $path   Path that is being deleted (e.g., 's3://a/b/c')
     * @param array  $params A result of StreamWrapper::withPath()
     *
     * @return bool
     */
    private function deleteSubfolder($path, $params)
    {
        // Use a key that adds a trailing slash if needed.
        $prefix = \rtrim($params['Key'], '/') . '/';
        $result = $this->getClient()->listObjects(['Bucket' => $params['Bucket'], 'Prefix' => $prefix, 'MaxKeys' => 1]);
        // Check if the bucket contains keys other than the placeholder
        if ($contents = $result['Contents']) {
            return \count($contents) > 1 || $contents[0]['Key'] != $prefix ? $this->triggerError('Subfolder is not empty') : $this->unlink(\rtrim($path, '/') . '/');
        }
        return $result['CommonPrefixes'] ? $this->triggerError('Subfolder contains nested folders') : \true;
    }
    /**
     * Determine the most appropriate ACL based on a file mode.
     *
     * @param int $mode File mode
     *
     * @return string
     */
    private function determineAcl($mode)
    {
        switch (\substr(\decoct($mode), 0, 1)) {
            case '7':
                return 'public-read';
            case '6':
                return 'authenticated-read';
            default:
                return 'private';
        }
    }
    /**
     * Gets a URL stat template with default values
     *
     * @return array
     */
    private function getStatTemplate()
    {
        return [0 => 0, 'dev' => 0, 1 => 0, 'ino' => 0, 2 => 0, 'mode' => 0, 3 => 0, 'nlink' => 0, 4 => 0, 'uid' => 0, 5 => 0, 'gid' => 0, 6 => -1, 'rdev' => -1, 7 => 0, 'size' => 0, 8 => 0, 'atime' => 0, 9 => 0, 'mtime' => 0, 10 => 0, 'ctime' => 0, 11 => -1, 'blksize' => -1, 12 => -1, 'blocks' => -1];
    }
    /**
     * Invokes a callable and triggers an error if an exception occurs while
     * calling the function.
     *
     * @param callable $fn
     * @param int      $flags
     *
     * @return bool
     */
    private function boolCall(callable $fn, $flags = null)
    {
        try {
            return $fn();
        } catch (\Exception $e) {
            return $this->triggerError($e->getMessage(), $flags);
        }
    }
    /**
     * @return LruArrayCache
     */
    private function getCacheStorage()
    {
        if (!$this->cache) {
            $this->cache = $this->getOption('cache') ?: new LruArrayCache();
        }
        return $this->cache;
    }
    /**
     * Clears a specific stat cache value from the stat cache and LRU cache.
     *
     * @param string $key S3 path (s3://bucket/key).
     */
    private function clearCacheKey($key)
    {
        \clearstatcache(\true, $key);
        $this->getCacheStorage()->remove($key);
    }
    /**
     * Returns the size of the opened object body.
     *
     * @return int|null
     */
    private function getSize()
    {
        $size = $this->body->getSize();
        return !empty($size) ? $size : $this->size;
    }
}
