silverstripe-reports/code/sitefeatures/MathSpamProtection.php

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<?php
/**
* Tools for adding an optional Maths protection question to a form.
*
* @package cms
* @subpackage comments
*/
class MathSpamProtection {
private static $mathProtection = false;
/**
* Creates the question from random variables, which are also saved to the session.
* @return String
*/
static function getMathQuestion(){
if(!Session::get("mathQuestionV1")&&!Session::get("mathQuestionV2")){
$v1 = rand(1,9);
$v2 = rand(1,9);
Session::set("mathQuestionV1",$v1);
Session::set("mathQuestionV2",$v2);
}
else{
$v1 = Session::get("mathQuestionV1");
$v2 = Session::get("mathQuestionV2");
}
return sprintf(
_t('MathSpamProtection.WHATIS',"What is %s plus %s?"),
MathSpamProtection::digitToWord($v1),
MathSpamProtection::digitToWord($v2)
);
}
/**
* Checks the given answer if it matches the addition of the saved session variables. Users can answer using words or digits.
*/
static function correctAnswer($answer){
$v1 = Session::get("mathQuestionV1");
$v2 = Session::get("mathQuestionV2");
Session::clear('mathQuestionV1');
Session::clear('mathQuestionV2');
if(MathSpamProtection::digitToWord($v1 + $v2) == $answer || ($v1 + $v2) == $answer){
return true;
}
return false;
}
/**
* Helper method for converting digits to their equivelant english words
*/
static function digitToWord($num){
$numbers = array(_t('MathSpamProtection.ZERO', 'zero'),
_t('MathSpamProtection.ONE', 'one'),
_t('MathSpamProtection.TWO', 'two'),
_t('MathSpamProtection.THREE', 'three'),
_t('MathSpamProtection.FOUR', 'four'),
_t('MathSpamProtection.FIVE', 'five'),
_t('MathSpamProtection.SIX', 'six'),
_t('MathSpamProtection.SEVEN', 'seven'),
_t('MathSpamProtection.EIGHT', 'eight'),
_t('MathSpamProtection.NINE', 'nine'),
_t('MathSpamProtection.TEN', 'ten'),
_t('MathSpamProtection.ELEVEN', 'eleven'),
_t('MathSpamProtection.TWELVE', 'twelve'),
_t('MathSpamProtection.THIRTEEN', 'thirteen'),
_t('MathSpamProtection.FOURTEEN', 'fourteen'),
_t('MathSpamProtection.FIFTEEN', 'fifteen'),
_t('MathSpamProtection.SIXTEEN', 'sixteen'),
_t('MathSpamProtection.SEVENTEEN', 'seventeen'),
_t('MathSpamProtection.EIGHTEEN', 'eighteen'));
if($num < 0) return "minus ".($numbers[-1*$num]);
return $numbers[$num];
}
static function isEnabled() {
return self::$mathProtection;
}
static function setEnabled($math = true) {
self::$mathProtection = $math;
}
}