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<?php
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// $Id: riddler.module,v 1.3 2009/06/26 15:48:16 awolfey Exp $
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/**
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* @file
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* Adds a question and answer type to the Captcha module.
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*
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* When enabled this module will add a required field to forms of your choice
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* asking a simple question to avoid automatic content creation by
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* spambots. The question and answers are custimizable.
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* Thanks to: nkoponen. Ported to D6 by awolfey.
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*/
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/**
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* Implementation of hook_help().
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*/
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function riddler_help($path, $arg) {
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switch ($path) {
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case 'admin/modules#description':
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return t('Requires anonymous users to answer a simple question to be answered forms are processed. A primitive but effective way to counter spam.');
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break;
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}
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}
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/**
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* Implementation of hook_perm().
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*/
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function riddler_perm() {
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return array(
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'administer riddler',
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);
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}
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/**
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* Implementation of hook_menu().
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*/
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function riddler_menu() {
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$items = array();
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$items['admin/user/captcha/riddler'] = array(
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'title' => 'Riddler',
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'description' => 'Allows you to force a question to a number of forms to counter f.e. spammers.',
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'page callback' => 'drupal_get_form',
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'page arguments' => array('riddler_settings'),
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'access arguments' => array('administer riddler'),
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'type' => MENU_LOCAL_TASK
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);
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return $items;
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}
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// Riddler settings form, called by drupal_get_form in menu.
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function riddler_settings() {
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$form = array();
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$form['riddler_weight'] = array(
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'#type' => 'select',
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'#title' => t('Weight'),
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'#default_value' => variable_get('riddler_weight', 0),
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'#options' => drupal_map_assoc(range(-10, 10)),
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'#description' => t('Weight of the Riddler form element'),
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'#required' => TRUE,
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);
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$form['riddler_groups'] = array(
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'#type' => 'fieldset',
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'#title' => t('Riddles'),
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'#description' => t('If you need more riddles, just submit the form, 3 empty riddles will appear.'),
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);
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$form['riddler_groups']['riddler_group_0'] = array(
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'#type' => 'fieldset',
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'#title' => variable_get('riddler_question_0', '') ? 'Default riddle: '. variable_get('riddler_question_0', '') : t('Riddle !i', array('!i' => 1)),
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'#description' => t('Empty question and answer to erase this group.'),
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'#collapsible' => TRUE,
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'#collapsed' => TRUE,
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);
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$form['riddler_groups']['riddler_group_0']['riddler_question_0'] = array(
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'#type' => 'textfield',
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'#title' => t('Question'),
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'#description' => t('A question that you require anonymous users to answer'),
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'#default_value' => variable_get('riddler_question_0', 'Do you hate spam? (yes or no)'),
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'#required' => FALSE,
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);
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$form['riddler_groups']['riddler_group_0']['riddler_answer_0'] = array(
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'#type' => 'textfield',
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'#title' => t('Answer'),
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'#default_value' => variable_get('riddler_answer_0', 'yes'),
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'#description' => t('Answer to the above question. You may allow more than one correct answer by entering a comma or space-separated list. Answers are not case sensitive. Answers must be only one word.'),
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'#required' => FALSE,
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);
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$number = variable_get('riddler_number', 1);
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for ( $i=1; $i<$number + 3; $i++) {
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$form['riddler_groups']['riddler_group_'. $i] = array(
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'#type' => 'fieldset',
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'#title' => variable_get('riddler_question_'. $i, '') ? 'Riddle '. $i . ': '. variable_get('riddler_question_'. $i, '') : t('Riddle !i', array('!i' => $i)),
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'#description' => t('Empty question and answer to erase this group.'),
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'#collapsible' => TRUE,
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'#collapsed' => $i < $number,
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);
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$form['riddler_groups']['riddler_group_'. $i]['riddler_question_'. $i] = array(
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'#type' => 'textfield',
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'#title' => t('Question'),
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'#description' => t('A question that you require anonymous users to answer'),
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'#default_value' => variable_get('riddler_question_'. $i, ''),
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'#required' => FALSE,
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);
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$form['riddler_groups']['riddler_group_'. $i]['riddler_answer_'. $i] = array(
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'#type' => 'textfield',
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'#title' => t('Answer'),
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'#default_value' => variable_get('riddler_answer_'. $i, ''),
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'#description' => t('Answer to the above question. You may allow more than one correct answer by entering a comma or space-separated list. Answers are not case sensitive. Answers must be only one word.'),
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'#required' => FALSE,
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);
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}
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$form['#validate'][] = 'riddler_settings_validate';
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$form['#submit'][] = 'riddler_settings_submit';
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return system_settings_form($form);
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}
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// Validating the settings form.
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function riddler_settings_validate($form, &$form_state) {
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$i = 0;
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while (array_key_exists('riddler_question_'. $i, $form_state['values'])) {
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if ($form_state['values']['riddler_question_'. $i] != '' && $form_state['values']['riddler_answer_'. $i] == '') {
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form_set_error('riddler_answer_'. $i, t('Group !i is incomplete (answer is missing).', array('!i' => $i+1)));
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}
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if ($form_state['values']['riddler_question_'. $i] == '' && $form_state['values']['riddler_answer_'. $i] != '') {
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form_set_error('riddler_question_'. $i, t('Group !i is incomplete (question is missing).', array('!i' => $i+1)));
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}
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$i++;
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}
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}
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// Processing the settings form.
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function riddler_settings_submit($form, &$form_state) {
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variable_set('riddler_weight', $form_state['values']['riddler_weight']);
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$i = 0;
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$number = 0;
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while (array_key_exists('riddler_question_'. $i, $form_state['values'])) {
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if ($form_state['values']['riddler_question_'. $i] != '') {
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variable_set('riddler_question_'. $number, $form_state['values']['riddler_question_'. $i]);
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variable_set('riddler_answer_'. $number, $form_state['values']['riddler_answer_'. $i]);
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$number++;
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}
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$i++;
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}
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variable_set('riddler_number', $number);
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}
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/**
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* Implementation of hook_captcha().
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*/
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function riddler_captcha($op, $captcha_type='') {
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switch ($op) {
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case 'list' :
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return array('Riddler');
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break;
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case 'generate' :
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$result = array();
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if ($captcha_type == 'Riddler') {
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$i = rand(1, variable_get('riddler_number', 1)) - 1;
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$result['form']['captcha_response'] = array(
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'#type' => 'textfield',
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'#title' => variable_get('riddler_question_'. $i, 'Do you hate spam? (yes or no)'),
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'#description' => t('Fill in the blank'),
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'#size' => 50,
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'#maxlength' => 50,
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'#required' => TRUE,
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'#weight' => variable_get('riddler_weight', 0),
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);
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$result['solution'] = (string)(drupal_strtolower(variable_get('riddler_answer_'. $i, 'yes')));
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$result['captcha_validate'] = 'riddler_captcha_validate';
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return $result;
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}
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break;
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}
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}
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// Custom captcha validation.
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function riddler_captcha_validate($solution, $response) {
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$solution = str_ireplace(',', '', $solution);
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$solution = explode(' ', $solution);
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return in_array(drupal_strtolower($response), $solution);
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}
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