IPB的PHP上传类

IPB的PHP上传类

使用方法

    $upload = new class_upload();
    $upload->out_file_dir     = './uploads';
    $upload->max_file_size    = '10000000';
    $upload->make_script_safe = 1;
    $upload->allowed_file_ext = array( 'gif', 'jpg', 'jpeg', 'png' );
    $upload->upload_process();
    if ( $upload->error_no )
    {
        switch( $upload->error_no )
        {
            case 1:
                // No upload
                print "No upload"; exit();
            case 2:
            case 5:
                // Invalid file ext
                 print "Invalid File Extension"; exit();
            case 3:
                // Too big...
                 print "File too big"; exit();
            case 4:
                // Cannot move uploaded file
                 print "Move failed"; exit();
        }
     }
    print $upload->saved_upload_name . " uploaded!";
?>

下载: class_upload.php

 
/*
+--------------------------------------------------------------------------
|   Invision Power Board
|   =============================================
|   by Matthew Mecham
|   (c) 2001 - 2006 Invision Power Services, Inc.
|   
|   =============================================
|   Web:
|   Licence Info: /?license
+---------------------------------------------------------------------------
|   > $Date: 2005-10-10 14:03:20 +0100 (Mon, 10 Oct 2005) $
|   > $Revision: 22 $
|   > $Author: matt $
+---------------------------------------------------------------------------
|
|   > UPLOAD handling methods (KERNEL)
|   > Module written by Matt Mecham
|   > Date started: 15th March 2004
|
|    > Module Version Number: 1.0.0
+--------------------------------------------------------------------------
| ERRORS:
| 1: No upload
| 2: Not valid upload type
| 3: Upload exceeds $max_file_size
| 4: Could not move uploaded file, upload deleted
| 5: File pretending to be an image but isn't (poss XSS attack)
+--------------------------------------------------------------------------
*/
 
/**
* IPS Kernel Pages: Upload
*
* This class contains all generic functions to handle
* the parsing of $_FILE data.
*
* Example Usage:
*
* $upload = new class_upload();
* $upload->out_file_dir     = './uploads';
* $upload->max_file_size    = '10000000';
* $upload->make_script_safe = 1;
* $upload->allowed_file_ext = array( 'gif', 'jpg', 'jpeg', 'png' );
* $upload->upload_process();
*
* if ( $upload->error_no )
* {
*      switch( $upload->error_no )
*      {
*          case 1:
*              // No upload
*              print "No upload"; exit();
*          case 2:
*          case 5:
*              // Invalid file ext
*               print "Invalid File Extension"; exit();
*          case 3:
*              // Too big...
*               print "File too big"; exit();
*         case 4:
*              // Cannot move uploaded file
*               print "Move failed"; exit();
*      }
*  }
* print $upload->saved_upload_name . " uploaded!";
*
* ERRORS:
* 1: No upload
* 2: Not valid upload type
* 3: Upload exceeds $max_file_size
* 4: Could not move uploaded file, upload deleted
* 5: File pretending to be an image but isn't (poss XSS attack)
*
* @package        IPS_KERNEL
* @author        Matt Mecham
* @copyright    Invision Power Services, Inc.
* @version        2.1
*/
 
/**
*
*/
 
/**
* Upload Class
*
* Methods and functions for handling file uploads
*
* @package    IPS_KERNEL
* @author   Matt Mecham
* @version    2.1
*/
class class_upload
{
    /**
    * Name of upload form field
    *
    * @var string
    */
    var $upload_form_field = 'FILE_UPLOAD';
    
    /**
    * Out filename *without* extension
    * (Leave blank to retain user filename)
    *
    * @var string
    */
    var $out_file_name    = '';
    
    /**
    * Out dir (./upload) - no trailing slash
    *
    * @var string
    */
    var $out_file_dir     = './';
    
    /**
    * maximum file size of this upload
    *
    * @var integer
    */
    var $max_file_size    = 0;
    
    /**
    * Forces PHP, CGI, etc to text
    *
    * @var integer
    */
    var $make_script_safe = 1;
    
    /**
    * Force non-img file extenstion (leave blank if not) (ex: 'ibf' makes upload.doc => upload.ibf)
    *
    * @var string
    */
    var $force_data_ext   = '';
    
    /**
    * Allowed file extensions array( 'gif', 'jpg', 'jpeg'..)
    *
    * @var array
    */
    var $allowed_file_ext = array();
    
    /**
    * Array of IMAGE file extensions
    *
    * @var array
    */
    var $image_ext        = array( 'gif', 'jpeg', 'jpg', 'jpe', 'png' );
    
    /**
    * Check to make sure an image is an image
    *
    * @var boolean flag
    */
    var $image_check      = 1;
    
    /**
    * Returns current file extension   
    *
    * @var string
    */
    var $file_extension   = '';
    
    /**
    * If force_data_ext == 1, this will return the 'real' extension
    * and $file_extension will return the 'force_data_ext'
    *
    * @var string
    */
    var $real_file_extension = '';
    
    /**
    * Returns error number   
    *
    * @var integer
    */
    var $error_no         = 0;
    
    /**
    * Returns if upload is img or not
    *
    * @var integer
    */
    var $is_image         = 0;
    
    /**
    * Returns file name as was uploaded by user
    *
    * @var string
    */
    var $original_file_name = "";
    
    /**
    * Returns final file name as is saved on disk. (no path info)
    *
    * @var string
    */
    var $parsed_file_name = "";
    
    /**
    * Returns final file name with path info
    *
    * @var string
    */
    var $saved_upload_name = "";
    
    /*-------------------------------------------------------------------------*/
    // CONSTRUCTOR
    /*-------------------------------------------------------------------------*/
    
    function class_upload()
    {
        
    }
    
    
    /*-------------------------------------------------------------------------*/
    // PROCESS THE UPLOAD
    /*-------------------------------------------------------------------------*/
    
    /**
    * Processes the upload
    *
    */
    
    function upload_process()
    {
        $this->_clean_paths();
        
        //-------------------------------------------------
        // Check for getimagesize
        //-------------------------------------------------
        
        if ( ! function_exists( 'getimagesize' ) )
        {
            $this->image_check = 0;
        }
        
        //-------------------------------------------------
        // Set up some variables to stop carpals developing
        //-------------------------------------------------
        
        $FILE_NAME = isset($_FILES[ $this->upload_form_field ]['name']) ? $_FILES[ $this->upload_form_field ]['name'] : '';
        $FILE_SIZE = isset($_FILES[ $this->upload_form_field ]['size']) ? $_FILES[ $this->upload_form_field ]['size'] : '';
        $FILE_TYPE = isset($_FILES[ $this->upload_form_field ]['type']) ? $_FILES[ $this->upload_form_field ]['type'] : '';
        
        //-------------------------------------------------
        // Naughty Opera adds the filename on the end of the
        // mime type - we don't want this.
        //-------------------------------------------------
        
        $FILE_TYPE = preg_replace( "/^(.+?);.*$/", "\\1", $FILE_TYPE );
        
        //-------------------------------------------------
        // Naughty Mozilla likes to use "none" to indicate an empty upload field.
        // I love universal languages that aren't universal.
        //-------------------------------------------------
        
        if ( !isset($_FILES[ $this->upload_form_field ]['name'])
        or $_FILES[ $this->upload_form_field ]['name'] == ""
        or !$_FILES[ $this->upload_form_field ]['name']
        or !$_FILES[ $this->upload_form_field ]['size']
        or ($_FILES[ $this->upload_form_field ]['name'] == "none") )
        {
            $this->error_no = 1;
            return;
        }
        
        if( !is_uploaded_file($_FILES[ $this->upload_form_field ]['tmp_name']) )
        {
            $this->error_no = 1;
            return;
        }
        
        //-------------------------------------------------
        // De we have allowed file_extensions?
        //-------------------------------------------------
        
        if ( ! is_array( $this->allowed_file_ext ) or ! count( $this->allowed_file_ext ) )
        {
            $this->error_no = 2;
            return;
        }
        
        //-------------------------------------------------
        // Get file extension
        //-------------------------------------------------
        
        $this->file_extension = $this->_get_file_extension( $FILE_NAME );
        
        if ( ! $this->file_extension )
        {
            $this->error_no = 2;
            return;
        }
        
        $this->real_file_extension = $this->file_extension;
        
        //-------------------------------------------------
        // Valid extension?
        //-------------------------------------------------
        
        if ( ! in_array( $this->file_extension, $this->allowed_file_ext ) )
        {
            $this->error_no = 2;
            return;
        }
        
        //-------------------------------------------------
        // Check the file size
        //-------------------------------------------------
        
        if ( ( $this->max_file_size ) and ( $FILE_SIZE > $this->max_file_size ) )
        {
            $this->error_no = 3;
            return;
        }
        
        //-------------------------------------------------
        // Make the uploaded file safe
        //-------------------------------------------------
        
        $FILE_NAME = preg_replace( "/[^\w\.]/", "_", $FILE_NAME );
        
        $this->original_file_name = $FILE_NAME;
        
        //-------------------------------------------------
        // Convert file name?
        // In any case, file name is WITHOUT extension
        //-------------------------------------------------
        
        if ( $this->out_file_name )
        {
            $this->parsed_file_name = $this->out_file_name;
        }
        else
        {
            $this->parsed_file_name = str_replace( '.'.$this->file_extension, "", $FILE_NAME );
        }
        
        //-------------------------------------------------
        // Make safe?
        //-------------------------------------------------
        
        $renamed = 0;
        
        if ( $this->make_script_safe )
        {
            if ( preg_match( "/\.(cgi|pl|js|asp|php|html|htm|jsp|jar)(\.|$)/i", $FILE_NAME ) )
            {
                $FILE_TYPE                 = 'text/plain';
                $this->file_extension      = 'txt';
                $this->parsed_file_name       = preg_replace( "/\.(cgi|pl|js|asp|php|html|htm|jsp|jar)(\.|$)/i", "$2", $this->parsed_file_name );
                
                $renamed = 1;
            }
        }
        
        //-------------------------------------------------
        // Is it an image?
        //-------------------------------------------------
 
        if ( is_array( $this->image_ext ) and count( $this->image_ext ) )
        {
            if ( in_array( $this->file_extension, $this->image_ext ) )
            {
                $this->is_image = 1;
            }
        }
        
        //-------------------------------------------------
        // Add on the extension...
        //-------------------------------------------------
        
        if ( $this->force_data_ext and ! $this->is_image )
        {
            $this->file_extension = str_replace( ".", "", $this->force_data_ext );
        }
        
        $this->parsed_file_name .= '.'.$this->file_extension;
        
        //-------------------------------------------------
        // Copy the upload to the uploads directory
        // ^^ We need to do this before checking the img
        //    size for the openbasedir restriction peeps
        //    We'll just unlink if it doesn't checkout
        //-------------------------------------------------
        
        $this->saved_upload_name = $this->out_file_dir.'/'.$this->parsed_file_name;
        
        if ( ! @move_uploaded_file( $_FILES[ $this->upload_form_field ]['tmp_name'], $this->saved_upload_name) )
        {
            $this->error_no = 4;
            return;
        }
        else
        {
            @chmod( $this->saved_upload_name, 0777 );
        }
        
        if( !$renamed )
        {
            $this->check_xss_infile();
            
            if( $this->error_no )
            {
                return;
            }
        }
        
        //-------------------------------------------------
        // Is it an image?
        //-------------------------------------------------
        
        if ( $this->is_image )
        {
            //-------------------------------------------------
            // Are we making sure its an image?
            //-------------------------------------------------
            
            if ( $this->image_check )
            {
                $img_attributes = @getimagesize( $this->saved_upload_name );
                
                if ( ! is_array( $img_attributes ) or ! count( $img_attributes ) )
                {
                    // Unlink the file first
                    @unlink( $this->saved_upload_name );
                    $this->error_no = 5;
                    return;
                }
                else if ( ! $img_attributes[2] )
                {
                    // Unlink the file first
                    @unlink( $this->saved_upload_name );
                    $this->error_no = 5;
                    return;
                }
                else if ( $img_attributes[2] == 1 AND ( $this->file_extension == 'jpg' OR $this->file_extension == 'jpeg' ) )
                {
                    // Potential XSS attack with a fake GIF header in a JPEG
                    @unlink( $this->saved_upload_name );
                    $this->error_no = 5;
                    return;
                }
            }
        }
        
        //-------------------------------------------------
        // If filesize and $_FILES['size'] don't match then
        // either file is corrupt, or there was funny
        // business between when it hit tmp and was moved
        //-------------------------------------------------
        
        if( filesize($this->saved_upload_name) != $_FILES[ $this->upload_form_field ]['size'] )
        {
            @unlink( $this->saved_upload_name );
            
            $this->error_no = 1;
            return;
        }
    }
    
    
    /*-------------------------------------------------------------------------*/
    // INTERNAL: Check for XSS inside file
    /*-------------------------------------------------------------------------*/
    
    /**
    * Checks for XSS inside file.  If found, sets error_no to 5 and returns
    *
    * @param void
    */
    
    function check_xss_infile()
    {
        // HTML added inside an inline file is not good in IE...
        
        $fh = fopen( $this->saved_upload_name, 'rb' );
        
        $file_check = fread( $fh, 512 );
        
        fclose( $fh );
        
        if( !$file_check )
        {
            @unlink( $this->saved_upload_name );
            $this->error_no = 5;
            return;
        }
        
        # Thanks to Nicolas Grekas from comments at for helping to identify all vulnerable HTML tags
        
        else if( preg_match( "#", $file_check ) )
        {
            @unlink( $this->saved_upload_name );
            $this->error_no = 5;
            return;
        }
    }
    
    /*-------------------------------------------------------------------------*/
    // INTERNAL: Get file extension
    /*-------------------------------------------------------------------------*/
    
    /**
    * Returns the file extension of the current filename
    *
    * @param string Filename
    */
    
    function _get_file_extension($file)
    {
        return strtolower( str_replace( ".", "", substr( $file, strrpos( $file, '.' ) ) ) );
    }
    
    /*-------------------------------------------------------------------------*/
    // INTERNAL: Clean paths
    /*-------------------------------------------------------------------------*/
    
    /**
    * Trims off trailing slashes
    *
    */
    
    function _clean_paths()
    {
        $this->out_file_dir = preg_replace( "#/$#", "", $this->out_file_dir );
    }
 
    
    
}
 
?>