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Filename : filesystem_helper.php
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<?php

/**
 * This file is part of CodeIgniter 4 framework.
 *
 * (c) CodeIgniter Foundation <admin@codeigniter.com>
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

// CodeIgniter File System Helpers

if (! function_exists('directory_map')) {
    /**
     * Create a Directory Map
     *
     * Reads the specified directory and builds an array
     * representation of it. Sub-folders contained with the
     * directory will be mapped as well.
     *
     * @param string $sourceDir      Path to source
     * @param int    $directoryDepth Depth of directories to traverse
     *                               (0 = fully recursive, 1 = current dir, etc)
     * @param bool   $hidden         Whether to show hidden files
     */
    function directory_map(string $sourceDir, int $directoryDepth = 0, bool $hidden = false): array
    {
        try {
            $fp = opendir($sourceDir);

            $fileData  = [];
            $newDepth  = $directoryDepth - 1;
            $sourceDir = rtrim($sourceDir, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;

            while (false !== ($file = readdir($fp))) {
                // Remove '.', '..', and hidden files [optional]
                if ($file === '.' || $file === '..' || ($hidden === false && $file[0] === '.')) {
                    continue;
                }

                if (is_dir($sourceDir . $file)) {
                    $file .= DIRECTORY_SEPARATOR;
                }

                if (($directoryDepth < 1 || $newDepth > 0) && is_dir($sourceDir . $file)) {
                    $fileData[$file] = directory_map($sourceDir . $file, $newDepth, $hidden);
                } else {
                    $fileData[] = $file;
                }
            }

            closedir($fp);

            return $fileData;
        } catch (Throwable $e) {
            return [];
        }
    }
}

if (! function_exists('directory_mirror')) {
    /**
     * Recursively copies the files and directories of the origin directory
     * into the target directory, i.e. "mirror" its contents.
     *
     * @param bool $overwrite Whether individual files overwrite on collision
     *
     * @throws InvalidArgumentException
     */
    function directory_mirror(string $originDir, string $targetDir, bool $overwrite = true): void
    {
        if (! is_dir($originDir = rtrim($originDir, '\\/'))) {
            throw new InvalidArgumentException(sprintf('The origin directory "%s" was not found.', $originDir));
        }

        if (! is_dir($targetDir = rtrim($targetDir, '\\/'))) {
            @mkdir($targetDir, 0755, true);
        }

        $dirLen = strlen($originDir);

        /**
         * @var SplFileInfo $file
         */
        foreach (new RecursiveIteratorIterator(
            new RecursiveDirectoryIterator($originDir, FilesystemIterator::SKIP_DOTS),
            RecursiveIteratorIterator::SELF_FIRST
        ) as $file) {
            $origin = $file->getPathname();
            $target = $targetDir . substr($origin, $dirLen);

            if ($file->isDir()) {
                if (! is_dir($target)) {
                    mkdir($target, 0755);
                }
            } elseif (! is_file($target) || ($overwrite && is_file($target))) {
                copy($origin, $target);
            }
        }
    }
}

if (! function_exists('write_file')) {
    /**
     * Write File
     *
     * Writes data to the file specified in the path.
     * Creates a new file if non-existent.
     *
     * @param string $path File path
     * @param string $data Data to write
     * @param string $mode fopen() mode (default: 'wb')
     */
    function write_file(string $path, string $data, string $mode = 'wb'): bool
    {
        try {
            $fp = fopen($path, $mode);

            flock($fp, LOCK_EX);

            for ($result = $written = 0, $length = strlen($data); $written < $length; $written += $result) {
                if (($result = fwrite($fp, substr($data, $written))) === false) {
                    break;
                }
            }

            flock($fp, LOCK_UN);
            fclose($fp);

            return is_int($result);
        } catch (Throwable $e) {
            return false;
        }
    }
}

if (! function_exists('delete_files')) {
    /**
     * Delete Files
     *
     * Deletes all files contained in the supplied directory path.
     * Files must be writable or owned by the system in order to be deleted.
     * If the second parameter is set to true, any directories contained
     * within the supplied base directory will be nuked as well.
     *
     * @param string $path   File path
     * @param bool   $delDir Whether to delete any directories found in the path
     * @param bool   $htdocs Whether to skip deleting .htaccess and index page files
     * @param bool   $hidden Whether to include hidden files (files beginning with a period)
     */
    function delete_files(string $path, bool $delDir = false, bool $htdocs = false, bool $hidden = false): bool
    {
        $path = realpath($path) ?: $path;
        $path = rtrim($path, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;

        try {
            foreach (new RecursiveIteratorIterator(
                new RecursiveDirectoryIterator($path, RecursiveDirectoryIterator::SKIP_DOTS),
                RecursiveIteratorIterator::CHILD_FIRST
            ) as $object) {
                $filename = $object->getFilename();
                if (! $hidden && $filename[0] === '.') {
                    continue;
                }

                if (! $htdocs || ! preg_match('/^(\.htaccess|index\.(html|htm|php)|web\.config)$/i', $filename)) {
                    $isDir = $object->isDir();
                    if ($isDir && $delDir) {
                        rmdir($object->getPathname());

                        continue;
                    }
                    if (! $isDir) {
                        unlink($object->getPathname());
                    }
                }
            }

            return true;
        } catch (Throwable $e) {
            return false;
        }
    }
}

if (! function_exists('get_filenames')) {
    /**
     * Get Filenames
     *
     * Reads the specified directory and builds an array containing the filenames.
     * Any sub-folders contained within the specified path are read as well.
     *
     * @param string    $sourceDir   Path to source
     * @param bool|null $includePath Whether to include the path as part of the filename; false for no path, null for a relative path, true for full path
     * @param bool      $hidden      Whether to include hidden files (files beginning with a period)
     */
    function get_filenames(string $sourceDir, ?bool $includePath = false, bool $hidden = false): array
    {
        $files = [];

        $sourceDir = realpath($sourceDir) ?: $sourceDir;
        $sourceDir = rtrim($sourceDir, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;

        try {
            foreach (new RecursiveIteratorIterator(
                new RecursiveDirectoryIterator($sourceDir, RecursiveDirectoryIterator::SKIP_DOTS),
                RecursiveIteratorIterator::SELF_FIRST
            ) as $name => $object) {
                $basename = pathinfo($name, PATHINFO_BASENAME);
                if (! $hidden && $basename[0] === '.') {
                    continue;
                }

                if ($includePath === false) {
                    $files[] = $basename;
                } elseif ($includePath === null) {
                    $files[] = str_replace($sourceDir, '', $name);
                } else {
                    $files[] = $name;
                }
            }
        } catch (Throwable $e) {
            return [];
        }

        sort($files);

        return $files;
    }
}

if (! function_exists('get_dir_file_info')) {
    /**
     * Get Directory File Information
     *
     * Reads the specified directory and builds an array containing the filenames,
     * filesize, dates, and permissions
     *
     * Any sub-folders contained within the specified path are read as well.
     *
     * @param string $sourceDir    Path to source
     * @param bool   $topLevelOnly Look only at the top level directory specified?
     * @param bool   $recursion    Internal variable to determine recursion status - do not use in calls
     */
    function get_dir_file_info(string $sourceDir, bool $topLevelOnly = true, bool $recursion = false): array
    {
        static $fileData = [];
        $relativePath    = $sourceDir;

        try {
            $fp = opendir($sourceDir);

            // reset the array and make sure $source_dir has a trailing slash on the initial call
            if ($recursion === false) {
                $fileData  = [];
                $sourceDir = rtrim(realpath($sourceDir), DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;
            }

            // Used to be foreach (scandir($source_dir, 1) as $file), but scandir() is simply not as fast
            while (false !== ($file = readdir($fp))) {
                if (is_dir($sourceDir . $file) && $file[0] !== '.' && $topLevelOnly === false) {
                    get_dir_file_info($sourceDir . $file . DIRECTORY_SEPARATOR, $topLevelOnly, true);
                } elseif ($file[0] !== '.') {
                    $fileData[$file]                  = get_file_info($sourceDir . $file);
                    $fileData[$file]['relative_path'] = $relativePath;
                }
            }

            closedir($fp);

            return $fileData;
        } catch (Throwable $fe) {
            return [];
        }
    }
}

if (! function_exists('get_file_info')) {
    /**
     * Get File Info
     *
     * Given a file and path, returns the name, path, size, date modified
     * Second parameter allows you to explicitly declare what information you want returned
     * Options are: name, server_path, size, date, readable, writable, executable, fileperms
     * Returns false if the file cannot be found.
     *
     * @param string $file           Path to file
     * @param mixed  $returnedValues Array or comma separated string of information returned
     *
     * @return array|null
     */
    function get_file_info(string $file, $returnedValues = ['name', 'server_path', 'size', 'date'])
    {
        if (! is_file($file)) {
            return null;
        }

        $fileInfo = [];

        if (is_string($returnedValues)) {
            $returnedValues = explode(',', $returnedValues);
        }

        foreach ($returnedValues as $key) {
            switch ($key) {
                case 'name':
                    $fileInfo['name'] = basename($file);
                    break;

                case 'server_path':
                    $fileInfo['server_path'] = $file;
                    break;

                case 'size':
                    $fileInfo['size'] = filesize($file);
                    break;

                case 'date':
                    $fileInfo['date'] = filemtime($file);
                    break;

                case 'readable':
                    $fileInfo['readable'] = is_readable($file);
                    break;

                case 'writable':
                    $fileInfo['writable'] = is_really_writable($file);
                    break;

                case 'executable':
                    $fileInfo['executable'] = is_executable($file);
                    break;

                case 'fileperms':
                    $fileInfo['fileperms'] = fileperms($file);
                    break;
            }
        }

        return $fileInfo;
    }
}

if (! function_exists('symbolic_permissions')) {
    /**
     * Symbolic Permissions
     *
     * Takes a numeric value representing a file's permissions and returns
     * standard symbolic notation representing that value
     *
     * @param int $perms Permissions
     */
    function symbolic_permissions(int $perms): string
    {
        if (($perms & 0xC000) === 0xC000) {
            $symbolic = 's'; // Socket
        } elseif (($perms & 0xA000) === 0xA000) {
            $symbolic = 'l'; // Symbolic Link
        } elseif (($perms & 0x8000) === 0x8000) {
            $symbolic = '-'; // Regular
        } elseif (($perms & 0x6000) === 0x6000) {
            $symbolic = 'b'; // Block special
        } elseif (($perms & 0x4000) === 0x4000) {
            $symbolic = 'd'; // Directory
        } elseif (($perms & 0x2000) === 0x2000) {
            $symbolic = 'c'; // Character special
        } elseif (($perms & 0x1000) === 0x1000) {
            $symbolic = 'p'; // FIFO pipe
        } else {
            $symbolic = 'u'; // Unknown
        }

        // Owner
        $symbolic .= (($perms & 0x0100) ? 'r' : '-')
                . (($perms & 0x0080) ? 'w' : '-')
                . (($perms & 0x0040) ? (($perms & 0x0800) ? 's' : 'x') : (($perms & 0x0800) ? 'S' : '-'));

        // Group
        $symbolic .= (($perms & 0x0020) ? 'r' : '-')
                . (($perms & 0x0010) ? 'w' : '-')
                . (($perms & 0x0008) ? (($perms & 0x0400) ? 's' : 'x') : (($perms & 0x0400) ? 'S' : '-'));

        // World
        $symbolic .= (($perms & 0x0004) ? 'r' : '-')
                . (($perms & 0x0002) ? 'w' : '-')
                . (($perms & 0x0001) ? (($perms & 0x0200) ? 't' : 'x') : (($perms & 0x0200) ? 'T' : '-'));

        return $symbolic;
    }
}

if (! function_exists('octal_permissions')) {
    /**
     * Octal Permissions
     *
     * Takes a numeric value representing a file's permissions and returns
     * a three character string representing the file's octal permissions
     *
     * @param int $perms Permissions
     */
    function octal_permissions(int $perms): string
    {
        return substr(sprintf('%o', $perms), -3);
    }
}

if (! function_exists('same_file')) {
    /**
     * Checks if two files both exist and have identical hashes
     *
     * @return bool Same or not
     */
    function same_file(string $file1, string $file2): bool
    {
        return is_file($file1) && is_file($file2) && md5_file($file1) === md5_file($file2);
    }
}

if (! function_exists('set_realpath')) {
    /**
     * Set Realpath
     *
     * @param bool $checkExistence Checks to see if the path exists
     */
    function set_realpath(string $path, bool $checkExistence = false): string
    {
        // Security check to make sure the path is NOT a URL. No remote file inclusion!
        if (preg_match('#^(http:\/\/|https:\/\/|www\.|ftp)#i', $path) || filter_var($path, FILTER_VALIDATE_IP) === $path) {
            throw new InvalidArgumentException('The path you submitted must be a local server path, not a URL');
        }

        // Resolve the path
        if (realpath($path) !== false) {
            $path = realpath($path);
        } elseif ($checkExistence && ! is_dir($path) && ! is_file($path)) {
            throw new InvalidArgumentException('Not a valid path: ' . $path);
        }

        // Add a trailing slash, if this is a directory
        return is_dir($path) ? rtrim($path, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR : $path;
    }
}