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<?php
class FunnyQuestion {
private static function normalizeAnswer($answer) {
return preg_replace('/[^a-z0-9]/', '', strtolower($answer));
}
private static function getLang() {
global $wgLang, $wgFunnyQuestions;
return (!empty($wgFunnyQuestions[$wgLang->getCode()]) ? $wgLang->getCode() : 'en');
}
private static function getFunnyQuestion() {
global $wgFunnyQuestionHash, $wgFunnyQuestions;
$question = array_rand($wgFunnyQuestions[self::getLang()]);
$time = time();
# make sure the user is not able to tell us the question to answer
$hash = sha1($time.$question.$wgFunnyQuestionHash);
return array('question' => $question, 'time' => $time, 'hash' => $hash);
}
private static function setFunnyCookie() {
global $wgFunnyQuestionHash, $wgFunnyQuestionRemember, $wgRequest;
$time = time();
$wgRequest->response()->setcookie('FunnyQuestionHash', sha1($time.wfGetIP().$wgFunnyQuestionHash), $time+$wgFunnyQuestionRemember);
$wgRequest->response()->setcookie('FunnyQuestionTime', $time, $time+$wgFunnyQuestionRemember);
}
private static function hasFunnyCookie() {
global $wgFunnyQuestionHash, $wgFunnyQuestionRemember, $wgCookiePrefix;
return (!empty($_COOKIE[$wgCookiePrefix.'FunnyQuestionHash']) && !empty($_COOKIE[$wgCookiePrefix.'FunnyQuestionTime'])
&& time() - $wgFunnyQuestionRemember <= $_COOKIE[$wgCookiePrefix.'FunnyQuestionTime']
&& sha1($_COOKIE[$wgCookiePrefix.'FunnyQuestionTime']. wfGetIP().$wgFunnyQuestionHash) == $_COOKIE[$wgCookiePrefix.'FunnyQuestionHash']);
}
private static function checkFunnyQuestion() {
global $wgFunnyQuestionHash, $wgFunnyQuestions, $wgFunnyQuestionTimeout, $wgFunnyQuestionWait;
if (self::hasFunnyCookie()) {
return true;
}
if (!empty($_POST['FunnyQuestionTime'])
&& !empty($_POST['FunnyQuestionHash'])
&& !empty($_POST['FunnyAnswer'])) {
$now = time();
$time = $_POST['FunnyQuestionTime'];
$hash = $_POST['FunnyQuestionHash'];
$userAnswer = self::normalizeAnswer($_POST['FunnyAnswer']);
} else {
return false;
}
if ($now - $time > $wgFunnyQuestionTimeout) {
return false;
} elseif ($now - $time < $wgFunnyQuestionWait) {
return false;
}
foreach ($wgFunnyQuestions[self::getLang()] as $question => $answers) {
if (!is_array($answers)) {
$answers = array($answers);
}
foreach ($answers as $answer) {
if (self::normalizeAnswer($answer) == $userAnswer
&& $hash == sha1($time.$question.$wgFunnyQuestionHash)) {
self::setFunnyCookie();
return true;
}
}
}
return false;
}
public static function addFunnyQuestionToEditPage($editpage, $output) {
global $wgUser;
if (!$wgUser->isLoggedIn() && !self::hasFunnyCookie()) {
$funnyQuestion = self::getFunnyQuestion();
$editpage->editFormTextAfterWarn .=
'<div class="editOptions">
<label for="FunnyAnswerField"><strong>'
.wfMsg('question-'.sha1($funnyQuestion['question'])).'</strong></label>
<input id="FunnyAnswerField" type="text" name="FunnyAnswer" value="" />
<input type="hidden" name="FunnyQuestionTime" value="'.$funnyQuestion['time'].'" />
<input type="hidden" name="FunnyQuestionHash" value="'.$funnyQuestion['hash'].'" />
</div>';
}
return true;
}
public static function checkFunnyQuestionOnEditPage($editor, $text, $section, &$error, $summary) {
global $wgUser;
if (!$wgUser->isLoggedIn() && !self::checkFunnyQuestion()) {
$error = '<div class="errorbox">'.wfMsg('wrong-answer').'</div><br clear="all" />';
}
return true;
}
public static function addFunnyQuestionToUserCreateForm($template) {
if (!self::hasFunnyCookie()) {
$funnyQuestion = self::getFunnyQuestion();
$template->addInputItem('FunnyAnswer', '', 'text', 'question-label', 'question-'.sha1($funnyQuestion['question']));
$template->addInputItem('FunnyQuestionTime', $funnyQuestion['time'], 'hidden', '');
$template->addInputItem('FunnyQuestionHash', $funnyQuestion['hash'], 'hidden', '');
}
return true;
}
public static function checkFunnyQuestionOnAbortNewAccount($user, &$message) {
if (!self::checkFunnyQuestion()) {
$message = wfMsg('wrong-answer');
return false;
} else {
return true;
}
}
}
?>
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