google_forms/system/helpers/file_helper.php

<?php

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2019 - 2022, CodeIgniter Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package CodeIgniter
 * @author  EllisLab Dev Team
 * @copyright   Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
 * @copyright   Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
 * @copyright   Copyright (c) 2019 - 2022, CodeIgniter Foundation (https://codeigniter.com/)
 * @license https://opensource.org/licenses/MIT MIT License
 * @link    https://codeigniter.com
 * @since   Version 1.0.0
 * @filesource
 */

defined('BASEPATH') or exit('No direct script access allowed');

/**
 * CodeIgniter File Helpers
 *
 * @package     CodeIgniter
 * @subpackage  Helpers
 * @category    Helpers
 * @author      EllisLab Dev Team
 * @link        https://codeigniter.com/userguide3/helpers/file_helper.html
 */

// ------------------------------------------------------------------------

if (! function_exists('read_file')) {
    /**
     * Read File
     *
     * Opens the file specified in the path and returns it as a string.
     *
     * @todo    Remove in version 3.1+.
     * @deprecated  3.0.0   It is now just an alias for PHP's native file_get_contents().
     * @param   string  $file   Path to file
     * @return  string  File contents
     */
    function read_file($file)
    {
        return @file_get_contents($file);
    }
}

// ------------------------------------------------------------------------

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  $mode   fopen() mode (default: 'wb')
     * @return  bool
     */
    function write_file($path, $data, $mode = 'wb')
    {
        if (! $fp = @fopen($path, $mode)) {
            return false;
        }

        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);
    }
}

// ------------------------------------------------------------------------

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    $del_dir    Whether to delete any directories found in the path
     * @param   bool    $htdocs     Whether to skip deleting .htaccess and index page files
     * @param   int $_level     Current directory depth level (default: 0; internal use only)
     * @return  bool
     */
    function delete_files($path, $del_dir = false, $htdocs = false, $_level = 0)
    {
        // Trim the trailing slash
        $path = rtrim($path, '/\\');

        if (! $current_dir = @opendir($path)) {
            return false;
        }

        while (false !== ($filename = @readdir($current_dir))) {
            if ($filename !== '.' && $filename !== '..') {
                $filepath = $path . DIRECTORY_SEPARATOR . $filename;

                if (is_dir($filepath) && $filename[0] !== '.' && ! is_link($filepath)) {
                    delete_files($filepath, $del_dir, $htdocs, $_level + 1);
                } elseif ($htdocs !== true or ! preg_match('/^(\.htaccess|index\.(html|htm|php)|web\.config)$/i', $filename)) {
                    @unlink($filepath);
                }
            }
        }

        closedir($current_dir);

        return ($del_dir === true && $_level > 0)
            ? @rmdir($path)
            : true;
    }
}

// ------------------------------------------------------------------------

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  path to source
     * @param   bool    whether to include the path as part of the filename
     * @param   bool    internal variable to determine recursion status - do not use in calls
     * @return  array
     */
    function get_filenames($source_dir, $include_path = false, $_recursion = false)
    {
        static $_filedata = array();

        if ($fp = @opendir($source_dir)) {
            // reset the array and make sure $source_dir has a trailing slash on the initial call
            if ($_recursion === false) {
                $_filedata = array();
                $source_dir = rtrim(realpath($source_dir), DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;
            }

            while (false !== ($file = readdir($fp))) {
                if (is_dir($source_dir . $file) && $file[0] !== '.') {
                    get_filenames($source_dir . $file . DIRECTORY_SEPARATOR, $include_path, true);
                } elseif ($file[0] !== '.') {
                    $_filedata[] = ($include_path === true) ? $source_dir . $file : $file;
                }
            }

            closedir($fp);
            return $_filedata;
        }

        return false;
    }
}

// --------------------------------------------------------------------

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  path to source
     * @param   bool    Look only at the top level directory specified?
     * @param   bool    internal variable to determine recursion status - do not use in calls
     * @return  array
     */
    function get_dir_file_info($source_dir, $top_level_only = true, $_recursion = false)
    {
        static $_filedata = array();
        $relative_path = $source_dir;

        if ($fp = @opendir($source_dir)) {
            // reset the array and make sure $source_dir has a trailing slash on the initial call
            if ($_recursion === false) {
                $_filedata = array();
                $source_dir = rtrim(realpath($source_dir), 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($fp))) {
                if (is_dir($source_dir . $file) && $file[0] !== '.' && $top_level_only === false) {
                    get_dir_file_info($source_dir . $file . DIRECTORY_SEPARATOR, $top_level_only, true);
                } elseif ($file[0] !== '.') {
                    $_filedata[$file] = get_file_info($source_dir . $file);
                    $_filedata[$file]['relative_path'] = $relative_path;
                }
            }

            closedir($fp);
            return $_filedata;
        }

        return false;
    }
}

// --------------------------------------------------------------------

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  path to file
     * @param   mixed   array or comma separated string of information returned
     * @return  array
     */
    function get_file_info($file, $returned_values = array('name', 'server_path', 'size', 'date'))
    {
        if (! file_exists($file)) {
            return false;
        }

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

        foreach ($returned_values 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('get_mime_by_extension')) {
    /**
     * Get Mime by Extension
     *
     * Translates a file extension into a mime type based on config/mimes.php.
     * Returns FALSE if it can't determine the type, or open the mime config file
     *
     * Note: this is NOT an accurate way of determining file mime types, and is here strictly as a convenience
     * It should NOT be trusted, and should certainly NOT be used for security
     *
     * @param   string  $filename   File name
     * @return  string
     */
    function get_mime_by_extension($filename)
    {
        static $mimes;

        if (! is_array($mimes)) {
            $mimes = get_mimes();

            if (empty($mimes)) {
                return false;
            }
        }

        $extension = strtolower(substr(strrchr($filename, '.'), 1));

        if (isset($mimes[$extension])) {
            return is_array($mimes[$extension])
                ? current($mimes[$extension]) // Multiple mime types, just give the first one
                : $mimes[$extension];
        }

        return false;
    }
}

// --------------------------------------------------------------------

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 $perms  Permissions
     * @return  string
     */
    function symbolic_permissions($perms)
    {
        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 $perms  Permissions
     * @return  string
     */
    function octal_permissions($perms)
    {
        return substr(sprintf('%o', $perms), -3);
    }
}