<?php

/*
+--------------------------------------------------------------------------
|   Invision Power Board v2.0.0 
|   =============================================
|   by Matthew Mecham
|   (c) 2001 - 2004 Invision Power Services, Inc.
|   http://www.invisionpower.com
|   =============================================
|   Web: http://www.invisionboard.com
|   Time: Tue, 21 Sep 2004 16:34:28 GMT
|   Release: 150aa7a702c3c8b6f6eb90ad49305d2f
|   Licence Info: http://www.invisionboard.com/?license
+---------------------------------------------------------------------------
|
|   > 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
+--------------------------------------------------------------------------
*/


class class_upload
{
	// name of upload form field
	var $upload_form_field = 'FILE_UPLOAD';
	
	// Out filename *without* extension
	// (Leave blank to retain user filename)
	var $out_file_name    = '';
	
	// Out dir (./upload) - no trailing slash
	var $out_file_dir     = './';
	
	// maximum file size of this upload
	var $max_file_size    = 0;
	
	// Forces PHP, CGI, etc to text
	var $make_script_safe = 1;
	
	// Force non-img file extenstion (leave blank if not) (ex: 'ibf'a makes upload.doc => upload.ibf)
	var $force_data_ext   = '';
	
	// Allowed file extensions array( 'gif', 'jpg', 'jpeg'..)
	var $allowed_file_ext = array();
	
	// Array of IMAGE file extensions
	var $image_ext        = array( 'gif', 'jpeg', 'jpg', 'png' );
	
	
	// Returns current file extension	
	var $file_extension   = '';
	
	// If force_data_ext == 1, this will return the 'real' extension
	// and $file_extension will return the 'force_data_ext'
	var $real_file_extension = '';
	
	// Returns error number	
	var $error_no         = 0;
	
	// Returns if upload is img or not
	var $is_image         = 0;
	
	// Returns file name as was uploaded by user
	var $original_file_name = "";
	
	// Returns final file name as is saved on disk. (no path info)
	var $parsed_file_name = "";
	
	// Returns final file name with path info
	var $saved_upload_name = "";
	
	/*-------------------------------------------------------------------------*/
	// CONSTRUCTOR
	/*-------------------------------------------------------------------------*/
	
	function class_upload()
	{
		
	}
	
	
	/*-------------------------------------------------------------------------*/
	// PROCESS THE UPLOAD
	/*-------------------------------------------------------------------------*/
	
	function upload_process()
	{
		$this->_clean_paths();
		
		//-------------------------------------------------
		// Set up some variables to stop carpals developing
		//-------------------------------------------------
		
		$FILE_NAME = $_FILES[ $this->upload_form_field ]['name'];
		$FILE_SIZE = $_FILES[ $this->upload_form_field ]['size'];
		$FILE_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 ($_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;
		}
		
		//-------------------------------------------------
		// 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;
		
		//-------------------------------------------------
		// 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;
			}
		}
		
		//-------------------------------------------------
		// 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?
		//-------------------------------------------------
		
		if ( $this->make_script_safe )
		{
			if ( preg_match( "/\.(cgi|pl|js|asp|php|html|htm|jsp|jar)/", $FILE_NAME ) )
			{
				$FILE_TYPE                 = 'text/plain';
				$this->file_extension      = 'txt';
			}
		}
		
		//-------------------------------------------------
		// 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
		//-------------------------------------------------
		
		$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 );
		}
	}
	
	/*-------------------------------------------------------------------------*/
	// INTERNAL: Get file extension
	/*-------------------------------------------------------------------------*/
	
	function _get_file_extension($file)
	{
		return strtolower( str_replace( ".", "", substr( $file, strrpos( $file, '.' ) ) ) );
	}
	
	/*-------------------------------------------------------------------------*/
	// INTERNAL: Clean paths
	/*-------------------------------------------------------------------------*/
	
	function _clean_paths()
	{
		$this->out_file_dir = preg_replace( "#/$#", "", $this->out_file_dir );
	}

	
}

?>