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<?php
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/**
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* Implementation of 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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* Implementation of 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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$form['hidden_captcha_label'] = array(
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'#type' => 'textfield',
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'#title' => t('Hidden text field label'),
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'#description' => t(
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"This is the hidden captcha form field's label, describing the expected input.<br />".
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"<strong>It is highly recommended to change it!</strong><br />".
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"The label should be as \"machine-readable\" as possible, encouraging spambots to fill in the field. An example might be a simple math challenge.<br />".
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"The label will only be visible to people who do not have CSS enabled and to robots."
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),
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'#default_value' => variable_get('hidden_captcha_label', 'Website URL'),
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);
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return system_settings_form($form);
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}
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/**
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* Implementation of 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': 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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$captcha['solution'] = '';
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$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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);
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return $captcha;
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}
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break;
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}
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}
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/**
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* Implementation of hook_theme().
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*/
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function hidden_captcha_theme() {
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return array(
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'captcha' => array(
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'arguments' => array('element' => NULL),
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'function' => 'theme_hidden_captcha_captcha'
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)
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);
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}
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/**
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* Implementation of theme_hook().
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*/
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function theme_hidden_captcha_captcha($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) $class .= substr($chars, rand(0, strlen($chars)-1), 1);
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//hide the random class via css
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drupal_add_css(".$class{width:0;height:0;overflow:hidden;}","inline"); // TODO: move the random class to an external file
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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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