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<?php
$wgExtensionCredits['other'][] = array(
'name' => 'FunnyQuestion',
'version' => '1.0',
'description' => 'Challenge-response authentication',
'author' => 'Pierre Schmitz',
'url' => 'https://www.archlinux.de'
);
if ($wgGroupPermissions['*']['edit']) {
$wgHooks['EditPage::showEditForm:fields'][] = 'FunnyQuestion::addFunnyQuestionToEditPage';
$wgHooks['EditFilter'][] = 'FunnyQuestion::checkFunnyQuestionOnEditPage';
}
if ($wgGroupPermissions['*']['createaccount'] && (empty($wgAuth) || $wgAuth->canCreateAccounts())) {
$wgHooks['UserCreateForm'][] = 'FunnyQuestion::addFunnyQuestionToUserCreateForm';
$wgHooks['AbortNewAccount'][] = 'FunnyQuestion::checkFunnyQuestionOnAbortNewAccount';
}
class FunnyQuestion {
private static $defaultQuestion = array(
"What is the Ultimate Answer to the Ultimate Question of Life, The Universe, and Everything?" => "42");
private static function normalizeAnswer($answer) {
return preg_replace('/[^a-z0-9]/', '', strtolower($answer));
}
private static function getFunnyQuestion() {
global $IP, $wgFunnyQuestionHash, $wgFunnyQuestions;
!isset($wgFunnyQuestions) && $wgFunnyQuestions = self::$defaultQuestion;
!isset($wgFunnyQuestionHash) && $wgFunnyQuestionHash = $IP;
$question = array_rand($wgFunnyQuestions);
$answer = self::normalizeAnswer($wgFunnyQuestions[$question]);
$time = time();
# make sure the user is not able to tell us the question to answer
$hash = sha1($time.$question.$answer.$wgFunnyQuestionHash);
return '<div>
<label for="FunnyAnswerField"><strong>'.$question.'</strong></label>
<input id="FunnyAnswerField" type="text" name="FunnyAnswer" size="'.strlen($answer).'" value="" />
<input type="hidden" name="FunnyQuestionTime" value="'.$time.'" />
<input type="hidden" name="FunnyQuestionHash" value="'.$hash.'" />
</div>';
}
private static function checkFunnyQuestion() {
global $IP, $wgFunnyQuestionHash, $wgFunnyQuestions, $wgFunnyQuestionTimeout, $wgFunnyQuestionWait;
# set some sane defaults
# can be overridden in LocalSettings.php
!isset($wgFunnyQuestions) && $wgFunnyQuestions = self::$defaultQuestion;
!isset($wgFunnyQuestionHash) && $wgFunnyQuestionHash = $IP;
!isset($wgFunnyQuestionTimeout) && $wgFunnyQuestionTimeout = 3600;
!isset($wgFunnyQuestionWait) && $wgFunnyQuestionWait = 2;
if (!empty($_POST['FunnyQuestionTime'])
&& !empty($_POST['FunnyQuestionHash'])
&& !empty($_POST['FunnyAnswer'])) {
$now = time();
$time = $_POST['FunnyQuestionTime'];
$hash = $_POST['FunnyQuestionHash'];
$answer = self::normalizeAnswer($_POST['FunnyAnswer']);
} else {
return false;
}
if ($now - $time > $wgFunnyQuestionTimeout) {
return false;
} elseif ($now - $time < $wgFunnyQuestionWait) {
return false;
}
foreach (array_keys($wgFunnyQuestions) as $question) {
if ($hash == sha1($time.$question.$answer.$wgFunnyQuestionHash)) {
return true;
}
}
return false;
}
public static function addFunnyQuestionToEditPage($editpage, $output) {
global $wgUser;
if (!$wgUser->isLoggedIn()) {
$editpage->editFormTextAfterWarn .= self::getFunnyQuestion();
}
return true;
}
public static function checkFunnyQuestionOnEditPage($editpage, $text, $section, $error) {
global $wgUser;
if (!$wgUser->isLoggedIn() && !self::checkFunnyQuestion()) {
$error = '<div class="errorbox">Your answer was wrong!</div><br clear="all" />';
}
return true;
}
public static function addFunnyQuestionToUserCreateForm($template) {
$template->set('header', self::getFunnyQuestion());
return true;
}
public static function checkFunnyQuestionOnAbortNewAccount($user, $message) {
if (!self::checkFunnyQuestion()) {
$message = 'Your answer was wrong!';
return false;
} else {
return true;
}
}
}
?>
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