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<?php
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/**
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* @file
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* All code for the Hidden CAPTCHA module, except installation-related code.
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*/
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/**
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* Implements hook_help().
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*/
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function hidden_captcha_help($path, $arg) {
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switch ($path) {
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case 'admin/config/people/captcha/hidden_captcha':
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return '<p>' . t('This CAPTCHA presents a text field that we expect no one to fill. The text field can be given any name and will be hidden from view using CSS.') . '</p>';
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}
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}
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/**
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* Implements hook_menu().
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*/
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function hidden_captcha_menu() {
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$items = array();
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$items['admin/config/people/captcha/hidden_captcha'] = array(
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'title' => 'Hidden CAPTCHA',
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'page callback' => 'drupal_get_form',
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'page arguments' => array('hidden_captcha_settings_form'),
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'access arguments' => array('administer CAPTCHA settings'),
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'type' => MENU_LOCAL_TASK,
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'weight' => -10,
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);
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return $items;
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}
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/**
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* Function for the hidden captcha settings form.
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*/
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function hidden_captcha_settings_form() {
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$form = array();
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$form['hidden_captcha_label'] = array(
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'#type' => 'textfield',
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'#title' => t('Hidden text field label'),
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'#description' => t("This is the hidden captcha form field's label, describing the expected input.<br /><strong>It is highly recommended to change it!</strong><br />The label should be as \"machine-readable\" as possible, encouraging spambots to fill in the field. An example might be a simple math challenge.<br />The label will only be visible to people who do not have CSS enabled and to robots."),
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'#default_value' => variable_get('hidden_captcha_label', 'Website URL'),
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);
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return system_settings_form($form);
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}
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/**
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* Implements hook_captcha().
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*/
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function hidden_captcha_captcha($op, $captcha_type = '') {
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switch ($op) {
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case 'list':
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return array('Hidden CAPTCHA');
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case 'generate':
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if ($captcha_type == 'Hidden CAPTCHA') {
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$captcha = array();
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$captcha['solution'] = '';
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// Ensure this captcha is cacheable.
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// @see https://www.drupal.org/project/captcha/issues/2449209
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$captcha['cacheable'] = TRUE;
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// The CAPTCHA solution provided by hook_captcha() is updated in the
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// 'captcha_session' table on pre-render phase of element process.
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// @see captcha_pre_render_process()
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// @see _captcha_update_captcha_session()
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// However, if the cache is enabled, solution would be empty for the
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// first attempt of the cached form. For the next attempt, there will
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// not be any 'sid' in form_state
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// (i.e. $form_state['captcha_info']['captcha_sid'] = null).
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// So a new solution would get generated at captcha_element_process().
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// The default 'captcha_validate' function,
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// captcha_validate_strict_equality(), would fail in this case.
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// @see captcha_validate()
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// Adding custom validation function to check solution is always empty.
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$captcha['captcha_validate'] = 'hidden_captcha_captcha_validate';
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$captcha['form']['captcha_response'] = array(
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'#type' => 'textfield',
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'#title' => variable_get('hidden_captcha_label', 'Website URL'),
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'#required' => FALSE,
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'#attributes' => array('tabindex' => '-1'),
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);
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return $captcha;
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}
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break;
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}
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}
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/**
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* CAPTCHA validation callback; checks that the response is empty.
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*/
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function hidden_captcha_captcha_validate($solution, $captcha_response, $element, $form_state) {
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return $captcha_response === '';
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}
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/**
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* Implements hook_theme().
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*/
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function hidden_captcha_theme() {
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return array(
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'captcha' => array(
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'arguments' => array('element' => NULL),
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'function' => 'theme_hidden_captcha_captcha',
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),
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);
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}
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/**
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* Implements theme_hook().
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*/
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function theme_hidden_captcha_captcha($element) {
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$captcha = theme_captcha($element);
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if (strncmp($element["element"]["#captcha_type"], "hidden_captcha/", 15) == 0) {
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// Generate a random class name.
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$chars = "abcdfghjkmnpqrstvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
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$class = "";
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for ($i = 0; $i < 64; ++$i) {
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$class .= substr($chars, rand(0, strlen($chars) - 1), 1);
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}
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// Hide the random class via CSS.
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// @todo Move the random class to an external file.
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drupal_add_css(".$class{width:0;height:0;overflow:hidden;}", "inline");
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// HTML for the captcha.
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$captcha = "<div class=\"$class\">" . $captcha . "</div>";
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}
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return $captcha;
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}
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