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<?php
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/**
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* @file
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* Honeypot module, for deterring spam bots from completing Drupal forms.
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*/
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/**
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* Implements hook_menu().
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*/
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function honeypot_menu() {
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$items['admin/config/content/honeypot'] = array(
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'title' => 'Honeypot configuration',
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'description' => 'Configure Honeypot spam prevention and the forms on which Honeypot will be used.',
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'page callback' => 'drupal_get_form',
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'page arguments' => array('honeypot_admin_form'),
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'access arguments' => array('administer honeypot'),
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'file' => 'honeypot.admin.inc',
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);
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return $items;
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}
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/**
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* Implements hook_permission().
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*/
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function honeypot_permission() {
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return array(
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'administer honeypot' => array(
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'title' => t('Administer Honeypot'),
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'description' => t('Administer Honeypot-protected forms and settings'),
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),
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'bypass honeypot protection' => array(
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'title' => t('Bypass Honeypot protection'),
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'description' => t('Bypass Honeypot form protection.'),
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),
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);
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}
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/**
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* Implements of hook_cron().
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*/
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function honeypot_cron() {
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// Delete {honeypot_user} entries older than the value of honeypot_expire.
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db_delete('honeypot_user')
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->condition('timestamp', time() - variable_get('honeypot_expire', 300), '<')
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->execute();
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}
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/**
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* Implements hook_form_alter().
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*
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* Add Honeypot features to forms enabled in the Honeypot admin interface.
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*/
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function honeypot_form_alter(&$form, &$form_state, $form_id) {
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// Don't use for maintenance mode forms (install, update, etc.).
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if (defined('MAINTENANCE_MODE')) {
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return;
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}
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$unprotected_forms = array(
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'user_login',
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'user_login_block',
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'search_form',
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'search_block_form',
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'views_exposed_form',
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'honeypot_admin_form',
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);
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// If configured to protect all forms, add protection to every form.
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if (variable_get('honeypot_protect_all_forms', 0) && !in_array($form_id, $unprotected_forms)) {
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// Don't protect system forms - only admins should have access, and system
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// forms may be programmatically submitted by drush and other modules.
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if (strpos($form_id, 'system_') === FALSE && strpos($form_id, 'search_') === FALSE && strpos($form_id, 'views_exposed_form_') === FALSE) {
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honeypot_add_form_protection($form, $form_state, array('honeypot', 'time_restriction'));
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}
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}
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// Otherwise add form protection to admin-configured forms.
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elseif ($forms_to_protect = honeypot_get_protected_forms()) {
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foreach ($forms_to_protect as $protect_form_id) {
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// For most forms, do a straight check on the form ID.
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if ($form_id == $protect_form_id) {
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honeypot_add_form_protection($form, $form_state, array('honeypot', 'time_restriction'));
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}
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// For webforms use a special check for variable form ID.
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elseif ($protect_form_id == 'webforms' && (strpos($form_id, 'webform_client_form') !== FALSE)) {
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honeypot_add_form_protection($form, $form_state, array('honeypot', 'time_restriction'));
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}
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}
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}
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}
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/**
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* Build an array of all the protected forms on the site, by form_id.
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*
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* @todo - Add in API call/hook to allow modules to add to this array.
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*/
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function honeypot_get_protected_forms() {
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$forms = &drupal_static(__FUNCTION__);
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// If the data isn't already in memory, get from cache or look it up fresh.
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if (!isset($forms)) {
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if ($cache = cache_get('honeypot_protected_forms')) {
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$forms = $cache->data;
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}
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else {
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// Look up all the honeypot forms in the variables table.
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$result = db_query("SELECT name FROM {variable} WHERE name LIKE 'honeypot_form_%'")->fetchCol();
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// Add each form that's enabled to the $forms array.
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foreach ($result as $variable) {
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if (variable_get($variable, 0)) {
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$forms[] = substr($variable, 14);
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}
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}
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// Save the cached data.
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cache_set('honeypot_protected_forms', $forms, 'cache');
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}
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}
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return $forms;
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}
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/**
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* Form builder function to add different types of protection to forms.
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*
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* @param array $options
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* Array of options to be added to form. Currently accepts 'honeypot' and
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* 'time_restriction'.
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*
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* @return array
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* Returns elements to be placed in a form's elements array to prevent spam.
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*/
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function honeypot_add_form_protection(&$form, &$form_state, $options = array()) {
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global $user;
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// Allow other modules to alter the protections applied to this form.
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drupal_alter('honeypot_form_protections', $options, $form);
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// Don't add any protections if the user can bypass the Honeypot.
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if (user_access('bypass honeypot protection')) {
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return;
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}
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// Build the honeypot element.
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if (in_array('honeypot', $options)) {
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// Get the element name (default is generic 'url').
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$honeypot_element = variable_get('honeypot_element_name', 'url');
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// Build the honeypot element.
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$honeypot_class = $honeypot_element . '-textfield';
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$form[$honeypot_element] = array(
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'#type' => 'textfield',
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'#title' => t('Leave this field blank'),
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'#size' => 20,
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'#weight' => 100,
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'#attributes' => array('autocomplete' => 'off'),
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'#element_validate' => array('_honeypot_honeypot_validate'),
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'#prefix' => '<div class="' . $honeypot_class . '">',
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'#suffix' => '</div>',
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// Hide honeypot.
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'#attached' => array(
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'css' => array(
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'.' . $honeypot_class . ' { display: none !important; }' => array('type' => 'inline'),
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),
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),
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);
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}
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// Build the time restriction element (if it's not disabled).
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if (in_array('time_restriction', $options) && variable_get('honeypot_time_limit', 5) != 0) {
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// Set the current time in a hidden value to be checked later.
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$form['honeypot_time'] = array(
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'#type' => 'hidden',
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'#title' => t('Timestamp'),
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'#default_value' => time(),
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'#element_validate' => array('_honeypot_time_restriction_validate'),
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);
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// Disable page caching to make sure timestamp isn't cached.
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if (user_is_anonymous()) {
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$GLOBALS['conf']['cache'] = 0;
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}
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}
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// Allow other modules to react to addition of form protection.
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if (!empty($options)) {
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module_invoke_all('honeypot_add_form_protection', $options, $form);
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}
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}
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/**
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* Validate honeypot field.
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*/
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function _honeypot_honeypot_validate($element, &$form_state) {
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// Get the honeypot field value.
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$honeypot_value = $element['#value'];
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// Make sure it's empty.
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if (!empty($honeypot_value)) {
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_honeypot_log($form_state['values']['form_id'], 'honeypot');
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form_set_error('', t('There was a problem with your form submission. Please refresh the page and try again.'));
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}
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}
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/**
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* Validate honeypot's time restriction field.
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*/
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function _honeypot_time_restriction_validate($element, &$form_state) {
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// Don't do anything if the triggering element is a preview button.
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if ($form_state['triggering_element']['#value'] == t('Preview')) {
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return;
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}
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// Get the time value.
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$honeypot_time = $form_state['values']['honeypot_time'];
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// Get the honeypot_time_limit.
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$time_limit = honeypot_get_time_limit($form_state['values']);
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// Make sure current time - (time_limit + form time value) is greater than 0.
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// If not, throw an error.
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if (time() < ($honeypot_time + $time_limit)) {
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_honeypot_log($form_state['values']['form_id'], 'honeypot_time');
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$time_limit = honeypot_get_time_limit();
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$form_state['values']['honeypot_time'] = time();
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form_set_error('', t('There was a problem with your form submission. Please wait @limit seconds and try again.', array('@limit' => $time_limit)));
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}
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}
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/**
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* Log blocked form submissions.
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*
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* @param string $form_id
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* Form ID for the form on which submission was blocked.
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* @param string $type
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* String indicating the reason the submission was blocked. Allowed values:
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* - honeypot: If honeypot field was filled in.
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* - honeypot_time: If form was completed before the configured time limit.
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*/
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function _honeypot_log($form_id, $type) {
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honeypot_log_failure($form_id, $type);
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if (variable_get('honeypot_log', 0)) {
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$variables = array(
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'%form' => $form_id,
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'@cause' => ($type == 'honeypot') ? t('submission of a value in the honeypot field') : t('submission of the form in less than minimum required time'),
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);
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watchdog('honeypot', 'Blocked submission of %form due to @cause.', $variables);
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}
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}
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/**
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* Look up the time limit for the current user.
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*
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* @param array $form_values
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* Array of form values (optional).
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*/
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function honeypot_get_time_limit($form_values = array()) {
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global $user;
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$honeypot_time_limit = variable_get('honeypot_time_limit', 5);
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// Only calculate time limit if honeypot_time_limit has a value > 0.
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if ($honeypot_time_limit) {
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// Get value from {honeypot_user} table for authenticated users.
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if ($user->uid) {
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$number = db_query("SELECT COUNT(*) FROM {honeypot_user} WHERE uid = :uid", array(':uid' => $user->uid))->fetchField();
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}
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// Get value from {flood} table for anonymous users.
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else {
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$number = db_query("SELECT COUNT(*) FROM {flood} WHERE event = :event AND identifier = :hostname AND timestamp > :time", array(
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':event' => 'honeypot',
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':hostname' => ip_address(),
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':time' => time() - variable_get('honeypot_expire', 300),
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))->fetchField();
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}
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// Don't add more than 30 days' worth of extra time.
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$honeypot_time_limit = $honeypot_time_limit + (int) min($honeypot_time_limit + exp($number), 2592000);
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$additions = module_invoke_all('honeypot_time_limit', $honeypot_time_limit, $form_values, $number);
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if (count($additions)) {
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$honeypot_time_limit += array_sum($additions);
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}
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}
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return $honeypot_time_limit;
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}
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/**
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* Log the failed submision with timestamp.
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*
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* @param string $form_id
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* Form ID for the rejected form submission.
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* @param string $type
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* String indicating the reason the submission was blocked. Allowed values:
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* - honeypot: If honeypot field was filled in.
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* - honeypot_time: If form was completed before the configured time limit.
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*/
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function honeypot_log_failure($form_id, $type) {
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global $user;
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// Log failed submissions for authenticated users.
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if ($user->uid) {
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db_insert('honeypot_user')
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->fields(array(
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'uid' => $user->uid,
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'timestamp' => time(),
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))
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->execute();
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}
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// Register flood event for anonymous users.
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else {
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flood_register_event('honeypot');
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}
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// Allow other modules to react to honeypot rejections.
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module_invoke_all('honeypot_reject', $form_id, $user->uid, $type);
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}
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