1137 lines
27 KiB
PHP
1137 lines
27 KiB
PHP
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP 5.1.6 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* File Uploading Class
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*
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* @package CodeIgniter
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* @subpackage Libraries
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* @category Uploads
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* @author ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/libraries/file_uploading.html
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*/
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class CI_Upload {
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public $max_size = 0;
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public $max_width = 0;
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public $max_height = 0;
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public $max_filename = 0;
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public $allowed_types = "";
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public $file_temp = "";
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public $file_name = "";
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public $orig_name = "";
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public $file_type = "";
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public $file_size = "";
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public $file_ext = "";
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public $upload_path = "";
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public $overwrite = FALSE;
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public $encrypt_name = FALSE;
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public $is_image = FALSE;
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public $image_width = '';
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public $image_height = '';
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public $image_type = '';
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public $image_size_str = '';
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public $error_msg = array();
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public $mimes = array();
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public $remove_spaces = TRUE;
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public $xss_clean = FALSE;
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public $temp_prefix = "temp_file_";
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public $client_name = '';
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protected $_file_name_override = '';
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/**
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* Constructor
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*
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* @access public
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*/
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public function __construct($props = array())
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{
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if (count($props) > 0)
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{
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$this->initialize($props);
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}
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log_message('debug', "Upload Class Initialized");
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}
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// --------------------------------------------------------------------
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/**
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* Initialize preferences
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*
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* @param array
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* @return void
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*/
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public function initialize($config = array())
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{
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$defaults = array(
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'max_size' => 0,
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'max_width' => 0,
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'max_height' => 0,
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'max_filename' => 0,
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'allowed_types' => "",
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'file_temp' => "",
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'file_name' => "",
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'orig_name' => "",
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'file_type' => "",
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'file_size' => "",
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'file_ext' => "",
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'upload_path' => "",
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'overwrite' => FALSE,
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'encrypt_name' => FALSE,
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'is_image' => FALSE,
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'image_width' => '',
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'image_height' => '',
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'image_type' => '',
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'image_size_str' => '',
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'error_msg' => array(),
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'mimes' => array(),
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'remove_spaces' => TRUE,
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'xss_clean' => FALSE,
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'temp_prefix' => "temp_file_",
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'client_name' => ''
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);
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foreach ($defaults as $key => $val)
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{
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if (isset($config[$key]))
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{
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$method = 'set_'.$key;
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if (method_exists($this, $method))
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{
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$this->$method($config[$key]);
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}
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else
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{
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$this->$key = $config[$key];
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}
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}
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else
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{
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$this->$key = $val;
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}
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}
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// if a file_name was provided in the config, use it instead of the user input
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// supplied file name for all uploads until initialized again
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$this->_file_name_override = $this->file_name;
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}
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// --------------------------------------------------------------------
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/**
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* Perform the file upload
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*
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* @return bool
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*/
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public function do_upload($field = 'userfile')
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{
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// Is $_FILES[$field] set? If not, no reason to continue.
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if ( ! isset($_FILES[$field]))
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{
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$this->set_error('upload_no_file_selected');
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return FALSE;
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}
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// Is the upload path valid?
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if ( ! $this->validate_upload_path())
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{
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// errors will already be set by validate_upload_path() so just return FALSE
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return FALSE;
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}
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// Was the file able to be uploaded? If not, determine the reason why.
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if ( ! is_uploaded_file($_FILES[$field]['tmp_name']))
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{
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$error = ( ! isset($_FILES[$field]['error'])) ? 4 : $_FILES[$field]['error'];
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switch($error)
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{
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case 1: // UPLOAD_ERR_INI_SIZE
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$this->set_error('upload_file_exceeds_limit');
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break;
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case 2: // UPLOAD_ERR_FORM_SIZE
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$this->set_error('upload_file_exceeds_form_limit');
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break;
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case 3: // UPLOAD_ERR_PARTIAL
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$this->set_error('upload_file_partial');
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break;
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case 4: // UPLOAD_ERR_NO_FILE
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$this->set_error('upload_no_file_selected');
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break;
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case 6: // UPLOAD_ERR_NO_TMP_DIR
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$this->set_error('upload_no_temp_directory');
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break;
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case 7: // UPLOAD_ERR_CANT_WRITE
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$this->set_error('upload_unable_to_write_file');
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break;
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case 8: // UPLOAD_ERR_EXTENSION
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$this->set_error('upload_stopped_by_extension');
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break;
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default : $this->set_error('upload_no_file_selected');
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break;
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}
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return FALSE;
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}
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// Set the uploaded data as class variables
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$this->file_temp = $_FILES[$field]['tmp_name'];
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$this->file_size = $_FILES[$field]['size'];
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$this->_file_mime_type($_FILES[$field]);
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$this->file_type = preg_replace("/^(.+?);.*$/", "\\1", $this->file_type);
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$this->file_type = strtolower(trim(stripslashes($this->file_type), '"'));
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$this->file_name = $this->_prep_filename($_FILES[$field]['name']);
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$this->file_ext = $this->get_extension($this->file_name);
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$this->client_name = $this->file_name;
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// Is the file type allowed to be uploaded?
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if ( ! $this->is_allowed_filetype())
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{
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$this->set_error('upload_invalid_filetype');
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return FALSE;
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}
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// if we're overriding, let's now make sure the new name and type is allowed
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if ($this->_file_name_override != '')
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{
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$this->file_name = $this->_prep_filename($this->_file_name_override);
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// If no extension was provided in the file_name config item, use the uploaded one
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if (strpos($this->_file_name_override, '.') === FALSE)
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{
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$this->file_name .= $this->file_ext;
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}
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// An extension was provided, lets have it!
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else
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{
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$this->file_ext = $this->get_extension($this->_file_name_override);
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}
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if ( ! $this->is_allowed_filetype(TRUE))
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{
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$this->set_error('upload_invalid_filetype');
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return FALSE;
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}
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}
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// Convert the file size to kilobytes
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if ($this->file_size > 0)
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{
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$this->file_size = round($this->file_size/1024, 2);
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}
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// Is the file size within the allowed maximum?
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if ( ! $this->is_allowed_filesize())
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{
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$this->set_error('upload_invalid_filesize');
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return FALSE;
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}
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// Are the image dimensions within the allowed size?
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// Note: This can fail if the server has an open_basdir restriction.
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if ( ! $this->is_allowed_dimensions())
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{
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$this->set_error('upload_invalid_dimensions');
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return FALSE;
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}
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// Sanitize the file name for security
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$this->file_name = $this->clean_file_name($this->file_name);
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// Truncate the file name if it's too long
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if ($this->max_filename > 0)
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{
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$this->file_name = $this->limit_filename_length($this->file_name, $this->max_filename);
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}
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// Remove white spaces in the name
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if ($this->remove_spaces == TRUE)
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{
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$this->file_name = preg_replace("/\s+/", "_", $this->file_name);
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}
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/*
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* Validate the file name
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* This function appends an number onto the end of
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* the file if one with the same name already exists.
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* If it returns false there was a problem.
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*/
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$this->orig_name = $this->file_name;
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if ($this->overwrite == FALSE)
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{
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$this->file_name = $this->set_filename($this->upload_path, $this->file_name);
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if ($this->file_name === FALSE)
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{
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return FALSE;
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}
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}
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/*
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* Run the file through the XSS hacking filter
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* This helps prevent malicious code from being
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* embedded within a file. Scripts can easily
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* be disguised as images or other file types.
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*/
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if ($this->xss_clean)
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{
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if ($this->do_xss_clean() === FALSE)
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{
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$this->set_error('upload_unable_to_write_file');
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return FALSE;
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}
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}
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/*
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* Move the file to the final destination
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* To deal with different server configurations
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* we'll attempt to use copy() first. If that fails
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* we'll use move_uploaded_file(). One of the two should
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* reliably work in most environments
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*/
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if ( ! @copy($this->file_temp, $this->upload_path.$this->file_name))
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{
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if ( ! @move_uploaded_file($this->file_temp, $this->upload_path.$this->file_name))
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{
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$this->set_error('upload_destination_error');
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return FALSE;
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}
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}
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/*
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* Set the finalized image dimensions
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* This sets the image width/height (assuming the
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* file was an image). We use this information
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* in the "data" function.
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*/
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$this->set_image_properties($this->upload_path.$this->file_name);
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Finalized Data Array
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*
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* Returns an associative array containing all of the information
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* related to the upload, allowing the developer easy access in one array.
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*
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* @return array
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*/
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public function data()
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{
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return array (
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'file_name' => $this->file_name,
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'file_type' => $this->file_type,
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'file_path' => $this->upload_path,
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'full_path' => $this->upload_path.$this->file_name,
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'raw_name' => str_replace($this->file_ext, '', $this->file_name),
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'orig_name' => $this->orig_name,
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'client_name' => $this->client_name,
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'file_ext' => $this->file_ext,
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'file_size' => $this->file_size,
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'is_image' => $this->is_image(),
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'image_width' => $this->image_width,
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'image_height' => $this->image_height,
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'image_type' => $this->image_type,
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'image_size_str' => $this->image_size_str,
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);
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}
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// --------------------------------------------------------------------
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/**
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* Set Upload Path
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*
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* @param string
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* @return void
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*/
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public function set_upload_path($path)
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{
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// Make sure it has a trailing slash
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$this->upload_path = rtrim($path, '/').'/';
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}
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// --------------------------------------------------------------------
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/**
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* Set the file name
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*
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* This function takes a filename/path as input and looks for the
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* existence of a file with the same name. If found, it will append a
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* number to the end of the filename to avoid overwriting a pre-existing file.
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*
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* @param string
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* @param string
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* @return string
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*/
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public function set_filename($path, $filename)
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{
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if ($this->encrypt_name == TRUE)
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{
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mt_srand();
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$filename = md5(uniqid(mt_rand())).$this->file_ext;
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}
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if ( ! file_exists($path.$filename))
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{
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return $filename;
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}
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$filename = str_replace($this->file_ext, '', $filename);
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$new_filename = '';
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for ($i = 1; $i < 100; $i++)
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{
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if ( ! file_exists($path.$filename.$i.$this->file_ext))
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{
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$new_filename = $filename.$i.$this->file_ext;
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break;
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}
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}
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if ($new_filename == '')
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{
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$this->set_error('upload_bad_filename');
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return FALSE;
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}
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else
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{
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return $new_filename;
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}
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}
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// --------------------------------------------------------------------
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/**
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* Set Maximum File Size
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*
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* @param integer
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* @return void
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*/
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public function set_max_filesize($n)
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{
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$this->max_size = ((int) $n < 0) ? 0: (int) $n;
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}
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// --------------------------------------------------------------------
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/**
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* Set Maximum File Name Length
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*
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* @param integer
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* @return void
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*/
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public function set_max_filename($n)
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{
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$this->max_filename = ((int) $n < 0) ? 0: (int) $n;
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}
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// --------------------------------------------------------------------
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/**
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* Set Maximum Image Width
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*
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* @param integer
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* @return void
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*/
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public function set_max_width($n)
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{
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$this->max_width = ((int) $n < 0) ? 0: (int) $n;
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}
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// --------------------------------------------------------------------
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/**
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* Set Maximum Image Height
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*
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* @param integer
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* @return void
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*/
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public function set_max_height($n)
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{
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$this->max_height = ((int) $n < 0) ? 0: (int) $n;
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}
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// --------------------------------------------------------------------
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/**
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* Set Allowed File Types
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*
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* @param string
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* @return void
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*/
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public function set_allowed_types($types)
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{
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if ( ! is_array($types) && $types == '*')
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{
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$this->allowed_types = '*';
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return;
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}
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$this->allowed_types = explode('|', $types);
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}
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// --------------------------------------------------------------------
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/**
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* Set Image Properties
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*
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* Uses GD to determine the width/height/type of image
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*
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* @param string
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* @return void
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*/
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public function set_image_properties($path = '')
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{
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if ( ! $this->is_image())
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{
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return;
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}
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if (function_exists('getimagesize'))
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{
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if (FALSE !== ($D = @getimagesize($path)))
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{
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$types = array(1 => 'gif', 2 => 'jpeg', 3 => 'png');
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$this->image_width = $D['0'];
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$this->image_height = $D['1'];
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$this->image_type = ( ! isset($types[$D['2']])) ? 'unknown' : $types[$D['2']];
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$this->image_size_str = $D['3']; // string containing height and width
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}
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}
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}
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// --------------------------------------------------------------------
|
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/**
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* Set XSS Clean
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*
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* Enables the XSS flag so that the file that was uploaded
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* will be run through the XSS filter.
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*
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* @param bool
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* @return void
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*/
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public function set_xss_clean($flag = FALSE)
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{
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$this->xss_clean = ($flag == TRUE) ? TRUE : FALSE;
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}
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|
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// --------------------------------------------------------------------
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|
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/**
|
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* Validate the image
|
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*
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* @return bool
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*/
|
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public function is_image()
|
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{
|
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// IE will sometimes return odd mime-types during upload, so here we just standardize all
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// jpegs or pngs to the same file type.
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$png_mimes = array('image/x-png');
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$jpeg_mimes = array('image/jpg', 'image/jpe', 'image/jpeg', 'image/pjpeg');
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if (in_array($this->file_type, $png_mimes))
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{
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$this->file_type = 'image/png';
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}
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if (in_array($this->file_type, $jpeg_mimes))
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{
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$this->file_type = 'image/jpeg';
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}
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$img_mimes = array(
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'image/gif',
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'image/jpeg',
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'image/png',
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);
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return (in_array($this->file_type, $img_mimes, TRUE)) ? TRUE : FALSE;
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}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Verify that the filetype is allowed
|
|
*
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* @return bool
|
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*/
|
|
public function is_allowed_filetype($ignore_mime = FALSE)
|
|
{
|
|
if ($this->allowed_types == '*')
|
|
{
|
|
return TRUE;
|
|
}
|
|
|
|
if (count($this->allowed_types) == 0 OR ! is_array($this->allowed_types))
|
|
{
|
|
$this->set_error('upload_no_file_types');
|
|
return FALSE;
|
|
}
|
|
|
|
$ext = strtolower(ltrim($this->file_ext, '.'));
|
|
|
|
if ( ! in_array($ext, $this->allowed_types))
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
// Images get some additional checks
|
|
$image_types = array('gif', 'jpg', 'jpeg', 'png', 'jpe');
|
|
|
|
if (in_array($ext, $image_types))
|
|
{
|
|
if (getimagesize($this->file_temp) === FALSE)
|
|
{
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
if ($ignore_mime === TRUE)
|
|
{
|
|
return TRUE;
|
|
}
|
|
|
|
$mime = $this->mimes_types($ext);
|
|
|
|
if (is_array($mime))
|
|
{
|
|
if (in_array($this->file_type, $mime, TRUE))
|
|
{
|
|
return TRUE;
|
|
}
|
|
}
|
|
elseif ($mime == $this->file_type)
|
|
{
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Verify that the file is within the allowed size
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function is_allowed_filesize()
|
|
{
|
|
if ($this->max_size != 0 AND $this->file_size > $this->max_size)
|
|
{
|
|
return FALSE;
|
|
}
|
|
else
|
|
{
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Verify that the image is within the allowed width/height
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function is_allowed_dimensions()
|
|
{
|
|
if ( ! $this->is_image())
|
|
{
|
|
return TRUE;
|
|
}
|
|
|
|
if (function_exists('getimagesize'))
|
|
{
|
|
$D = @getimagesize($this->file_temp);
|
|
|
|
if ($this->max_width > 0 AND $D['0'] > $this->max_width)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
if ($this->max_height > 0 AND $D['1'] > $this->max_height)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Validate Upload Path
|
|
*
|
|
* Verifies that it is a valid upload path with proper permissions.
|
|
*
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function validate_upload_path()
|
|
{
|
|
if ($this->upload_path == '')
|
|
{
|
|
$this->set_error('upload_no_filepath');
|
|
return FALSE;
|
|
}
|
|
|
|
if (function_exists('realpath') AND @realpath($this->upload_path) !== FALSE)
|
|
{
|
|
$this->upload_path = str_replace("\\", "/", realpath($this->upload_path));
|
|
}
|
|
|
|
if ( ! @is_dir($this->upload_path))
|
|
{
|
|
$this->set_error('upload_no_filepath');
|
|
return FALSE;
|
|
}
|
|
|
|
if ( ! is_really_writable($this->upload_path))
|
|
{
|
|
$this->set_error('upload_not_writable');
|
|
return FALSE;
|
|
}
|
|
|
|
$this->upload_path = preg_replace("/(.+?)\/*$/", "\\1/", $this->upload_path);
|
|
return TRUE;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Extract the file extension
|
|
*
|
|
* @param string
|
|
* @return string
|
|
*/
|
|
public function get_extension($filename)
|
|
{
|
|
$x = explode('.', $filename);
|
|
return '.'.end($x);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Clean the file name for security
|
|
*
|
|
* @param string
|
|
* @return string
|
|
*/
|
|
public function clean_file_name($filename)
|
|
{
|
|
$bad = array(
|
|
"<!--",
|
|
"-->",
|
|
"'",
|
|
"<",
|
|
">",
|
|
'"',
|
|
'&',
|
|
'$',
|
|
'=',
|
|
';',
|
|
'?',
|
|
'/',
|
|
"%20",
|
|
"%22",
|
|
"%3c", // <
|
|
"%253c", // <
|
|
"%3e", // >
|
|
"%0e", // >
|
|
"%28", // (
|
|
"%29", // )
|
|
"%2528", // (
|
|
"%26", // &
|
|
"%24", // $
|
|
"%3f", // ?
|
|
"%3b", // ;
|
|
"%3d" // =
|
|
);
|
|
|
|
$filename = str_replace($bad, '', $filename);
|
|
|
|
return stripslashes($filename);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Limit the File Name Length
|
|
*
|
|
* @param string
|
|
* @return string
|
|
*/
|
|
public function limit_filename_length($filename, $length)
|
|
{
|
|
if (strlen($filename) < $length)
|
|
{
|
|
return $filename;
|
|
}
|
|
|
|
$ext = '';
|
|
if (strpos($filename, '.') !== FALSE)
|
|
{
|
|
$parts = explode('.', $filename);
|
|
$ext = '.'.array_pop($parts);
|
|
$filename = implode('.', $parts);
|
|
}
|
|
|
|
return substr($filename, 0, ($length - strlen($ext))).$ext;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Runs the file through the XSS clean function
|
|
*
|
|
* This prevents people from embedding malicious code in their files.
|
|
* I'm not sure that it won't negatively affect certain files in unexpected ways,
|
|
* but so far I haven't found that it causes trouble.
|
|
*
|
|
* @return void
|
|
*/
|
|
public function do_xss_clean()
|
|
{
|
|
$file = $this->file_temp;
|
|
|
|
if (filesize($file) == 0)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
if (function_exists('memory_get_usage') && memory_get_usage() && ini_get('memory_limit') != '')
|
|
{
|
|
$current = ini_get('memory_limit') * 1024 * 1024;
|
|
|
|
// There was a bug/behavioural change in PHP 5.2, where numbers over one million get output
|
|
// into scientific notation. number_format() ensures this number is an integer
|
|
// http://bugs.php.net/bug.php?id=43053
|
|
|
|
$new_memory = number_format(ceil(filesize($file) + $current), 0, '.', '');
|
|
|
|
ini_set('memory_limit', $new_memory); // When an integer is used, the value is measured in bytes. - PHP.net
|
|
}
|
|
|
|
// If the file being uploaded is an image, then we should have no problem with XSS attacks (in theory), but
|
|
// IE can be fooled into mime-type detecting a malformed image as an html file, thus executing an XSS attack on anyone
|
|
// using IE who looks at the image. It does this by inspecting the first 255 bytes of an image. To get around this
|
|
// CI will itself look at the first 255 bytes of an image to determine its relative safety. This can save a lot of
|
|
// processor power and time if it is actually a clean image, as it will be in nearly all instances _except_ an
|
|
// attempted XSS attack.
|
|
|
|
if (function_exists('getimagesize') && @getimagesize($file) !== FALSE)
|
|
{
|
|
if (($file = @fopen($file, 'rb')) === FALSE) // "b" to force binary
|
|
{
|
|
return FALSE; // Couldn't open the file, return FALSE
|
|
}
|
|
|
|
$opening_bytes = fread($file, 256);
|
|
fclose($file);
|
|
|
|
// These are known to throw IE into mime-type detection chaos
|
|
// <a, <body, <head, <html, <img, <plaintext, <pre, <script, <table, <title
|
|
// title is basically just in SVG, but we filter it anyhow
|
|
|
|
if ( ! preg_match('/<(a|body|head|html|img|plaintext|pre|script|table|title)[\s>]/i', $opening_bytes))
|
|
{
|
|
return TRUE; // its an image, no "triggers" detected in the first 256 bytes, we're good
|
|
}
|
|
else
|
|
{
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
if (($data = @file_get_contents($file)) === FALSE)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
$CI =& get_instance();
|
|
return $CI->security->xss_clean($data, TRUE);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Set an error message
|
|
*
|
|
* @param string
|
|
* @return void
|
|
*/
|
|
public function set_error($msg)
|
|
{
|
|
$CI =& get_instance();
|
|
$CI->lang->load('upload');
|
|
|
|
if (is_array($msg))
|
|
{
|
|
foreach ($msg as $val)
|
|
{
|
|
$msg = ($CI->lang->line($val) == FALSE) ? $val : $CI->lang->line($val);
|
|
$this->error_msg[] = $msg;
|
|
log_message('error', $msg);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
$msg = ($CI->lang->line($msg) == FALSE) ? $msg : $CI->lang->line($msg);
|
|
$this->error_msg[] = $msg;
|
|
log_message('error', $msg);
|
|
}
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Display the error message
|
|
*
|
|
* @param string
|
|
* @param string
|
|
* @return string
|
|
*/
|
|
public function display_errors($open = '<p>', $close = '</p>')
|
|
{
|
|
$str = '';
|
|
foreach ($this->error_msg as $val)
|
|
{
|
|
$str .= $open.$val.$close;
|
|
}
|
|
|
|
return $str;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* List of Mime Types
|
|
*
|
|
* This is a list of mime types. We use it to validate
|
|
* the "allowed types" set by the developer
|
|
*
|
|
* @param string
|
|
* @return string
|
|
*/
|
|
public function mimes_types($mime)
|
|
{
|
|
global $mimes;
|
|
|
|
if (count($this->mimes) == 0)
|
|
{
|
|
if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'))
|
|
{
|
|
include(APPPATH.'config/'.ENVIRONMENT.'/mimes.php');
|
|
}
|
|
elseif (is_file(APPPATH.'config/mimes.php'))
|
|
{
|
|
include(APPPATH.'config//mimes.php');
|
|
}
|
|
else
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
$this->mimes = $mimes;
|
|
unset($mimes);
|
|
}
|
|
|
|
return ( ! isset($this->mimes[$mime])) ? FALSE : $this->mimes[$mime];
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Prep Filename
|
|
*
|
|
* Prevents possible script execution from Apache's handling of files multiple extensions
|
|
* http://httpd.apache.org/docs/1.3/mod/mod_mime.html#multipleext
|
|
*
|
|
* @param string
|
|
* @return string
|
|
*/
|
|
protected function _prep_filename($filename)
|
|
{
|
|
if (strpos($filename, '.') === FALSE OR $this->allowed_types == '*')
|
|
{
|
|
return $filename;
|
|
}
|
|
|
|
$parts = explode('.', $filename);
|
|
$ext = array_pop($parts);
|
|
$filename = array_shift($parts);
|
|
|
|
foreach ($parts as $part)
|
|
{
|
|
if ( ! in_array(strtolower($part), $this->allowed_types) OR $this->mimes_types(strtolower($part)) === FALSE)
|
|
{
|
|
$filename .= '.'.$part.'_';
|
|
}
|
|
else
|
|
{
|
|
$filename .= '.'.$part;
|
|
}
|
|
}
|
|
|
|
$filename .= '.'.$ext;
|
|
|
|
return $filename;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* File MIME type
|
|
*
|
|
* Detects the (actual) MIME type of the uploaded file, if possible.
|
|
* The input array is expected to be $_FILES[$field]
|
|
*
|
|
* @param array
|
|
* @return void
|
|
*/
|
|
protected function _file_mime_type($file)
|
|
{
|
|
// We'll need this to validate the MIME info string (e.g. text/plain; charset=us-ascii)
|
|
$regexp = '/^([a-z\-]+\/[a-z0-9\-\.\+]+)(;\s.+)?$/';
|
|
|
|
/* Fileinfo extension - most reliable method
|
|
*
|
|
* Unfortunately, prior to PHP 5.3 - it's only available as a PECL extension and the
|
|
* more convenient FILEINFO_MIME_TYPE flag doesn't exist.
|
|
*/
|
|
if (function_exists('finfo_file'))
|
|
{
|
|
$finfo = finfo_open(FILEINFO_MIME);
|
|
if (is_resource($finfo)) // It is possible that a FALSE value is returned, if there is no magic MIME database file found on the system
|
|
{
|
|
$mime = @finfo_file($finfo, $file['tmp_name']);
|
|
finfo_close($finfo);
|
|
|
|
/* According to the comments section of the PHP manual page,
|
|
* it is possible that this function returns an empty string
|
|
* for some files (e.g. if they don't exist in the magic MIME database)
|
|
*/
|
|
if (is_string($mime) && preg_match($regexp, $mime, $matches))
|
|
{
|
|
$this->file_type = $matches[1];
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* This is an ugly hack, but UNIX-type systems provide a "native" way to detect the file type,
|
|
* which is still more secure than depending on the value of $_FILES[$field]['type'], and as it
|
|
* was reported in issue #750 (https://github.com/EllisLab/CodeIgniter/issues/750) - it's better
|
|
* than mime_content_type() as well, hence the attempts to try calling the command line with
|
|
* three different functions.
|
|
*
|
|
* Notes:
|
|
* - the DIRECTORY_SEPARATOR comparison ensures that we're not on a Windows system
|
|
* - many system admins would disable the exec(), shell_exec(), popen() and similar functions
|
|
* due to security concerns, hence the function_exists() checks
|
|
*/
|
|
if (DIRECTORY_SEPARATOR !== '\\')
|
|
{
|
|
$cmd = 'file --brief --mime ' . escapeshellarg($file['tmp_name']) . ' 2>&1';
|
|
|
|
if (function_exists('exec'))
|
|
{
|
|
/* This might look confusing, as $mime is being populated with all of the output when set in the second parameter.
|
|
* However, we only neeed the last line, which is the actual return value of exec(), and as such - it overwrites
|
|
* anything that could already be set for $mime previously. This effectively makes the second parameter a dummy
|
|
* value, which is only put to allow us to get the return status code.
|
|
*/
|
|
$mime = @exec($cmd, $mime, $return_status);
|
|
if ($return_status === 0 && is_string($mime) && preg_match($regexp, $mime, $matches))
|
|
{
|
|
$this->file_type = $matches[1];
|
|
return;
|
|
}
|
|
}
|
|
|
|
if ( (bool) @ini_get('safe_mode') === FALSE && function_exists('shell_exec'))
|
|
{
|
|
$mime = @shell_exec($cmd);
|
|
if (strlen($mime) > 0)
|
|
{
|
|
$mime = explode("\n", trim($mime));
|
|
if (preg_match($regexp, $mime[(count($mime) - 1)], $matches))
|
|
{
|
|
$this->file_type = $matches[1];
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (function_exists('popen'))
|
|
{
|
|
$proc = @popen($cmd, 'r');
|
|
if (is_resource($proc))
|
|
{
|
|
$mime = @fread($proc, 512);
|
|
@pclose($proc);
|
|
if ($mime !== FALSE)
|
|
{
|
|
$mime = explode("\n", trim($mime));
|
|
if (preg_match($regexp, $mime[(count($mime) - 1)], $matches))
|
|
{
|
|
$this->file_type = $matches[1];
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Fall back to the deprecated mime_content_type(), if available (still better than $_FILES[$field]['type'])
|
|
if (function_exists('mime_content_type'))
|
|
{
|
|
$this->file_type = @mime_content_type($file['tmp_name']);
|
|
if (strlen($this->file_type) > 0) // It's possible that mime_content_type() returns FALSE or an empty string
|
|
{
|
|
return;
|
|
}
|
|
}
|
|
|
|
$this->file_type = $file['type'];
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
}
|
|
// END Upload Class
|
|
|
|
/* End of file Upload.php */
|
|
/* Location: ./system/libraries/Upload.php */
|