<?
/**
* Brett D. Estrade
* 3/29/2001
* brett@mvdev.com
* http://www.mvdev.com
* This class is designed to let you easily implement required constraints on your php applications
*
* You can use this class as long as you keep this header up here along with a summary of any modifications
* that you have made.
*
* Also, if you have any suggestions on how to improve this, please email me with a detailed suggestion.
* If there is a bug or vulnerability found, please alert me immediately
*/
class testThis {
/**
* Tests constraint provided by user. Levels can be extended simply by adding to the switch statement
*/
function constraint($reqConstraint = '1 == 1',$requireLevel,$errMsg = '')
{
/**
* Test for illegal code; Attempts to prevent insertion of other
* types of code for execution by searching for a "}";
*/
if(ereg('}',$reqConstraint))
{
Die('Illegal character "}" found.');
}
/**
* Switch that checks for $requireLevel. Add more for extended functionality
*/
switch($requireLevel)
{
case 1:
// returns error and kills script process if false
$str = 'if ('.$reqConstraint.'){return true;}else{die(\''.$errMsg.'\');}';
eval($str);
break;
case 2:
// just returns false and error if false
$str = 'if ('.$reqConstraint.'){return true;}else{echo \''.$errMsg.'\'; return false;}';
eval($str);
break;
default:
die('Level <b>'.$requireLevel.'</b> not defined.<br>Script Terminated...good bye!');
break;
}
}
/**
* The following are methods that utilize the constraint method above. There are many ways that this can
* be used, and the following are just a couple of them
*/
/**
* Requires file provided by user. Levels can be extended simply by adding to the switch statement to this->constraint
* First, existance of file is checked. If that is true, the it uses the constraint method to perform the inclusion of the file
* If file does not exist, the constraint function is called, this time with a predermined 'false' inserted, and it handles the rest
*/
function includeFile($file = '',$requireLevel = 1,$errMsg = ''){
if (file_exists($file)){
$this->constraint('@include('.$file.')',$requireLevel,$errMsg);
} else {
$this->constraint('false',$requireLevel,$errMsg);
}
}
/**
* Requires file provided by user. Levels can be extended simply by adding to the switch statement to this->constraint
* First, existance of file is checked. If that is true, the it uses the constraint method to perform the inclusion of the file
* If file does not exist, the constraint function is called, this time with a predermined 'false' inserted, and it handles the rest
*/
function requireFile($file = '',$requireLevel = 1,$errMsg = 'Required file does not exist Script Terminated...good bye!'){
if (file_exists($file)){
$this->constraint('@require('.$file.')',$requireLevel,$errMsg);
} else {
$this->constraint('false',$requireLevel,$errMsg);
}
}
}
?>
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