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<?php
define('CAPTCHA_UNSOLVED_CHALLENGES_MAX', 20);
define('CAPTCHA_PERSISTENCE_SHOW_ALWAYS', 1);
define('CAPTCHA_PERSISTENCE_SKIP_ONCE_SUCCESSFUL_PER_FORM', 2);
define('CAPTCHA_PERSISTENCE_SKIP_ONCE_SUCCESSFUL', 3);
function captcha_help($section = 'admin/help#captcha') {
switch ($section) {
case 'admin/help#captcha':
$output = '<p>' . t('"CAPTCHA" is an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart". It is typically a challenge-response test to determine whether the user is human. The CAPTCHA module is a tool to fight automated submission by malicious users (spamming) of for example comments forms, user registration forms, guestbook forms, etc. You can extend the desired forms with an additional challenge, which should be easy for a human to solve correctly, but hard enough to keep automated scripts and spam bots out.') . '</p>';
$output .= '<p>' . t('Note that the CAPTCHA module interacts with page caching (see <a href="!performancesettings">performance settings</a>). Because the challenge should be unique for each generated form, the caching of the page it appears on is prevented. Make sure that these forms do not appear on too many pages or you will lose much caching efficiency. For example, if you put a CAPTCHA on the user login block, which typically appears on each page for anonymous visitors, caching will practically be disabled. The comment submission forms are another example. In this case you should set the "%commentlocation" to "%separatepage" in <a href="!commentsettings">the comment settings</a> for better caching efficiency.', array(
'!performancesettings' => url('admin/settings/performance'),
'%commentlocation' => t('Location of comment submission form'),
'%separatepage' => t('Display on separate page'),
'!commentsettings' => url('admin/content/comment/settings'),
)) . '</p>';
$output .= '<p>' . t('CAPTCHA is a trademark of Carnegie Mellon University.') . '</p>';
return $output;
case 'admin/user/captcha':
case 'admin/user/captcha/captcha':
case 'admin/user/captcha/captcha/settings':
return t('<p>A CAPTCHA can be added to virtually each Drupal form. Some default forms are already provided in the form list, but arbitrary forms can be easily added and managed when the option "%adminlinks" is enabled.</p><p>Users with the "%skipcaptcha" <a href="@perm">permission</a> won\'t be offered a challenge. Be sure to grant this permission to the trusted users (e.g. site administrators). If you want to test a protected form, be sure to do it as a user without the "%skipcaptcha" permission (e.g. as anonymous user).</p>', array(
'@perm' => url('admin/user/access'),
'%adminlinks' => t('Add CAPTCHA administration links to forms'),
'%skipcaptcha' => t('skip CAPTCHA'),
));
}
}
function captcha_menu($may_cache) {
$items = array();
if ($may_cache) {
$items[] = array(
'path' => 'admin/user/captcha',
'title' => t('CAPTCHA'),
'description' => t('Administer how and where CAPTCHAs are used.'),
'callback' => 'drupal_get_form',
'callback arguments' => array(
'captcha_admin_settings',
),
'access' => user_access('administer CAPTCHA settings'),
'type' => MENU_NORMAL_ITEM,
);
$items[] = array(
'path' => 'admin/user/captcha/captcha',
'title' => t('CAPTCHA'),
'type' => MENU_DEFAULT_LOCAL_TASK,
'weight' => -20,
);
$items[] = array(
'path' => 'admin/user/captcha/captcha/settings',
'title' => t('General settings'),
'type' => MENU_DEFAULT_LOCAL_TASK,
'weight' => 0,
);
$items[] = array(
'path' => 'admin/user/captcha/captcha/examples',
'title' => t('Examples'),
'description' => t('An overview of the available challenge types with examples.'),
'callback' => 'captcha_examples',
'type' => MENU_LOCAL_TASK,
'weight' => 5,
);
$items[] = array(
'path' => 'admin/user/captcha/captcha/captcha_point',
'title' => t('Set CAPTCHA point'),
'description' => t('Add or edit form_id\'s to protect with a CAPTCHA.'),
'callback' => 'drupal_get_form',
'callback arguments' => array(
'captcha_point_admin_form',
),
'type' => MENU_LOCAL_TASK,
'weight' => 2,
);
}
else {
if (arg(4) == 'captcha_point' && arg(0) == 'admin' && arg(1) == 'user' && arg(2) == 'captcha' && arg(3) == 'captcha' && !is_null(arg(5))) {
$items[] = array(
'path' => 'admin/user/captcha/captcha/captcha_point/' . arg(5) . '/disable',
'title' => t('Disable'),
'callback' => 'drupal_get_form',
'callback arguments' => array(
'captcha_point_disable_confirm',
arg(5),
FALSE,
),
'type' => MENU_CALLBACK,
);
$items[] = array(
'path' => 'admin/user/captcha/captcha/captcha_point/' . arg(5) . '/delete',
'title' => t('Delete'),
'callback' => 'drupal_get_form',
'callback arguments' => array(
'captcha_point_disable_confirm',
arg(5),
TRUE,
),
'type' => MENU_CALLBACK,
);
}
}
return $items;
}
function captcha_perm() {
return array(
'administer CAPTCHA settings',
'skip CAPTCHA',
);
}
function captcha_requirements($phase) {
$requirements = array();
$t = get_t();
if ($phase == 'runtime') {
$requirements['captcha_wrong_response_counter'] = array(
'title' => $t('CAPTCHA'),
'value' => $t('Already @counter blocked form submissions', array(
'@counter' => variable_get('captcha_wrong_response_counter', 0),
)),
'severity' => REQUIREMENT_INFO,
);
if (!db_result(db_query('SELECT COUNT(*) FROM {users} WHERE uid=%d', 0))) {
$requirements['captcha_no_sessions_for_anonymous'] = array(
'title' => $t('CAPTCHA'),
'value' => $t('No sessions for anonymous users.'),
'description' => $t('There is no entry for uid 0 in the %users table of the database. This disables persistent session data for anonymous users. Because the CAPTCHA module depends on this session data, CAPTCHAs will not work for anonymous users. Add a row for uid 0 to the %users table to resolve this.', array(
'%users' => 'users',
)),
'severity' => REQUIREMENT_ERROR,
);
}
}
return $requirements;
}
function _captcha_available_challenge_types() {
$captcha_types['none'] = '<' . t('none') . '>';
foreach (module_implements('captcha') as $module) {
$result = call_user_func_array($module . '_captcha', array(
'list',
));
if (is_array($result)) {
foreach ($result as $type) {
$captcha_types["{$module}/{$type}"] = "{$type} ({$module})";
}
}
}
return $captcha_types;
}
function _captcha_get_description($lang_code = NULL) {
$default = t('This question is for testing whether you are a human visitor and to prevent automated spam submissions.');
if (module_exists('locale')) {
if ($lang_code == NULL) {
global $locale;
$lang_code = $locale;
}
$description = variable_get("captcha_description_{$lang_code}", $default);
}
else {
$description = variable_get('captcha_description', $default);
}
return filter_xss_admin($description);
}
function captcha_admin_settings() {
$form['captcha_administration_mode'] = array(
'#type' => 'checkbox',
'#title' => t('Add CAPTCHA administration links to forms'),
'#default_value' => variable_get('captcha_administration_mode', FALSE),
'#description' => t('This option is very helpful to enable/disable challenges on forms. When enabled, users with the "%admincaptcha" permission will see CAPTCHA administration links on all forms (except on administrative pages, which shouldn\'t be accessible to untrusted users in the first place). These links make it possible to enable a challenge of the desired type or disable it.', array(
'%admincaptcha' => t('administer CAPTCHA settings'),
)),
);
$form['captcha_types'] = array(
'#type' => 'fieldset',
'#title' => t('Challenge type per form'),
'#description' => t('Select the challenge type you want for each of the listed forms (identified by their so called <em>form_id</em>\'s). You can easily add arbitrary forms with the help of the \'%CAPTCHA_admin_links\' option or the <a href="!add_captcha_point">the CAPTCHA point form</a>.', array(
'%CAPTCHA_admin_links' => t('Add CAPTCHA administration links to forms'),
'!add_captcha_point' => url('admin/user/captcha/captcha/captcha_point'),
)),
'#tree' => TRUE,
'#collapsible' => TRUE,
'#collapsed' => FALSE,
'#theme' => 'captcha_admin_settings_captcha_points',
);
$captcha_types = _captcha_available_challenge_types();
$result = db_query("SELECT * FROM {captcha_points} ORDER BY form_id");
while ($captcha_point = db_fetch_object($result)) {
$form['captcha_types'][$captcha_point->form_id]['form_id'] = array(
'#value' => $captcha_point->form_id,
);
$form['captcha_types'][$captcha_point->form_id]['captcha_type'] = array(
'#type' => 'select',
'#default_value' => "{$captcha_point->module}/{$captcha_point->type}",
'#options' => $captcha_types,
);
$form['captcha_types'][$captcha_point->form_id]['operations'] = array(
'#value' => implode(", ", array(
l(t('delete'), "admin/user/captcha/captcha/captcha_point/{$captcha_point->form_id}/delete"),
)),
);
}
if (module_exists('locale')) {
$langs = locale_supported_languages();
$form['captcha_descriptions'] = array(
'#type' => 'fieldset',
'#title' => t('Challenge description'),
'#description' => t('With this description you can explain the purpose of the challenge to the user.'),
);
foreach ($langs['name'] as $lang_code => $lang_name) {
$form['captcha_descriptions']["captcha_description_{$lang_code}"] = array(
'#type' => 'textfield',
'#title' => t('For language %lang_name (code %lang_code)', array(
'%lang_name' => $lang_name,
'%lang_code' => $lang_code,
)),
'#default_value' => _captcha_get_description($lang_code),
'#maxlength' => 256,
);
}
}
else {
$form['captcha_description'] = array(
'#type' => 'textfield',
'#title' => t('Challenge description'),
'#description' => t('With this description you can explain the purpose of the challenge to the user.'),
'#default_value' => _captcha_get_description(),
'#maxlength' => 256,
);
}
$form['captcha_persistence'] = array(
'#type' => 'radios',
'#title' => t('Persistence'),
'#default_value' => variable_get('captcha_persistence', CAPTCHA_PERSISTENCE_SHOW_ALWAYS),
'#options' => array(
CAPTCHA_PERSISTENCE_SHOW_ALWAYS => t('Always add a challenge.'),
CAPTCHA_PERSISTENCE_SKIP_ONCE_SUCCESSFUL_PER_FORM => t('Omit challenges for a form once the user has successfully responded to a challenge for that form.'),
CAPTCHA_PERSISTENCE_SKIP_ONCE_SUCCESSFUL => t('Omit challenges for all forms once the user has successfully responded to a challenge.'),
),
'#description' => t('Define if challenges should be omitted during the rest of a session once the user successfully responses to a challenge.'),
);
$form['captcha_log_wrong_responses'] = array(
'#type' => 'checkbox',
'#title' => t('Log wrong responses'),
'#description' => t('Report information about wrong responses to the !watchdoglog.', array(
'!watchdoglog' => l(t('log'), 'admin/logs/watchdog'),
)),
'#default_value' => variable_get('captcha_log_wrong_responses', FALSE),
);
$form['submit'] = array(
'#type' => 'submit',
'#value' => t('Submit'),
);
return $form;
}
function theme_captcha_admin_settings_captcha_points($form) {
foreach (element_children($form) as $key) {
$row = array();
$row[] = drupal_render($form[$key]['form_id']);
$row[] = drupal_render($form[$key]['captcha_type']);
$row[] = drupal_render($form[$key]['operations']);
$rows[] = $row;
}
$header = array(
'form_id',
t('Challenge type (module)'),
t('Operations'),
);
$output = theme('table', $header, $rows);
return $output;
}
function captcha_admin_settings_submit($form_id, $form_values) {
if ($form_id == 'captcha_admin_settings') {
variable_set('captcha_administration_mode', $form_values['captcha_administration_mode']);
foreach ($form_values['captcha_types'] as $captcha_point_form_id => $data) {
if ($data['captcha_type'] == 'none') {
db_query("UPDATE {captcha_points} SET module = NULL, type = NULL WHERE form_id = '%s'", $captcha_point_form_id);
}
else {
list($module, $type) = explode('/', $data['captcha_type']);
db_query("UPDATE {captcha_points} SET module = '%s', type = '%s' WHERE form_id = '%s'", $module, $type, $captcha_point_form_id);
}
}
if (module_exists('locale')) {
$langs = locale_supported_languages();
foreach ($langs['name'] as $lang_code => $lang_name) {
variable_set("captcha_description_{$lang_code}", $form_values["captcha_description_{$lang_code}"]);
}
}
else {
variable_set('captcha_description', $form_values['captcha_description']);
}
variable_set('captcha_persistence', $form_values['captcha_persistence']);
variable_set('captcha_log_wrong_responses', $form_values['captcha_log_wrong_responses']);
drupal_set_message(t('The CAPTCHA settings were saved.'), 'status');
}
}
function captcha_point_admin_form($captcha_point_form_id = NULL) {
$form = array();
$default_captcha_type = 'none';
if (isset($captcha_point_form_id)) {
$form['captcha_point_form_id'] = array(
'#type' => 'textfield',
'#title' => t('Form ID'),
'#description' => t('The Drupal form_id of the form to add the CAPTCHA to.'),
'#value' => check_plain($captcha_point_form_id),
'#disabled' => TRUE,
);
$result = db_query("SELECT * FROM {captcha_points} WHERE form_id = '%s'", $captcha_point_form_id);
$captcha_point = db_fetch_object($result);
if ($captcha_point) {
$default_captcha_type = "{$captcha_point->module}/{$captcha_point->type}";
}
}
else {
$form['captcha_point_form_id'] = array(
'#type' => 'textfield',
'#title' => t('Form ID'),
'#description' => t('The Drupal form_id of the form to add the CAPTCHA to.'),
);
}
$form['captcha_type'] = array(
'#type' => 'select',
'#title' => t('Challenge type'),
'#description' => t('The CAPTCHA type to use for this form'),
'#default_value' => $default_captcha_type,
'#options' => _captcha_available_challenge_types(),
);
$form['#redirect'] = 'admin/user/captcha';
$form['submit'] = array(
'#type' => 'submit',
'#value' => t('Save'),
);
return $form;
}
function captcha_point_admin_form_validate($form, $form_values) {
if (!preg_match('/^[a-z0-9_]+$/', $form_values['captcha_point_form_id'])) {
form_set_error('captcha_point_form_id', t('Illegal form_id'));
}
}
function captcha_point_admin_form_submit($form, $form_values) {
$captcha_point_form_id = $form_values['captcha_point_form_id'];
$captcha_type = $form_values['captcha_type'];
db_query("DELETE FROM {captcha_points} WHERE form_id = '%s'", $captcha_point_form_id);
if ($captcha_type == 'none') {
db_query("INSERT INTO {captcha_points} (form_id, module, type) VALUES ('%s', NULL, NULL)", $captcha_point_form_id);
}
else {
list($module, $type) = explode('/', $captcha_type);
db_query("INSERT INTO {captcha_points} (form_id, module, type) VALUES ('%s', '%s', '%s')", $captcha_point_form_id, $module, $type);
}
drupal_set_message(t('Saved CAPTCHA point settings.'), 'status');
}
function captcha_point_disable_confirm($captcha_point_form_id, $delete) {
$form = array();
$form['captcha_point_form_id'] = array(
'#type' => 'value',
'#value' => $captcha_point_form_id,
);
$form['captcha_point_delete'] = array(
'#type' => 'value',
'#value' => $delete,
);
if ($delete) {
$message = t('Are you sure you want to delete the CAPTCHA for form_id %form_id?', array(
'%form_id' => $captcha_point_form_id,
));
$yes = t('Delete');
}
else {
$message = t('Are you sure you want to disable the CAPTCHA for form_id %form_id?', array(
'%form_id' => $captcha_point_form_id,
));
$yes = t('Disable');
}
return confirm_form($form, $message, isset($_GET['destination']) ? $_GET['destination'] : 'admin/user/captcha/captcha', '', $yes);
}
function captcha_point_disable_confirm_submit($form, $form_values) {
$captcha_point_form_id = $form_values['captcha_point_form_id'];
$delete = $form_values['captcha_point_delete'];
if ($delete) {
db_query("DELETE FROM {captcha_points} WHERE form_id = '%s'", $captcha_point_form_id);
drupal_set_message(t('Deleted CAPTCHA for form %form_id.', array(
'%form_id' => $captcha_point_form_id,
)));
}
else {
db_query("UPDATE {captcha_points} SET module = NULL, type = NULL WHERE form_id = '%s'", $captcha_point_form_id);
drupal_set_message(t('Disabled CAPTCHA for form %form_id.', array(
'%form_id' => $captcha_point_form_id,
)));
}
return 'admin/user/captcha';
}
function _captcha_persistence_skip($form_id) {
$persistence = variable_get('captcha_persistence', CAPTCHA_PERSISTENCE_SHOW_ALWAYS);
return $persistence == CAPTCHA_PERSISTENCE_SKIP_ONCE_SUCCESSFUL && $_SESSION['captcha']['success'] === TRUE || $persistence == CAPTCHA_PERSISTENCE_SKIP_ONCE_SUCCESSFUL_PER_FORM && $_SESSION['captcha'][$form_id]['success'] === TRUE;
}
function captcha_form_alter($form_id, &$form) {
if (!user_access('skip CAPTCHA')) {
$result = db_query("SELECT module, type FROM {captcha_points} WHERE form_id = '%s'", $form_id);
if (!$result) {
return;
}
$captcha_point = db_fetch_object($result);
if (!$captcha_point || !$captcha_point->type) {
return;
}
global $conf;
$conf['cache'] = FALSE;
if (_captcha_persistence_skip($form_id)) {
return;
}
$captcha = module_invoke($captcha_point->module, 'captcha', 'generate', $captcha_point->type);
if (!$captcha) {
watchdog('CAPTCHA', t('CAPTCHA problem: hook_captcha() of module %module returned nothing when trying to retrieve challenge type %type for form %form_id.', array(
'%type' => $captcha_point->type,
'%module' => $captcha_point->module,
'%form_id' => $form_id,
)), WATCHDOG_ERROR);
return;
}
$captcha_description = _captcha_get_description();
if ($captcha_description) {
$form['captcha'] = array(
'#type' => 'fieldset',
'#title' => t('CAPTCHA'),
'#description' => $captcha_description,
'#attributes' => array(
'class' => 'captcha',
),
);
}
else {
$form['captcha'] = array(
'#type' => 'markup',
'#prefix' => '<div class="captcha">',
'#suffix' => '</div>',
);
}
$form['captcha'] = array_merge($form['captcha'], $captcha['form']);
$form['captcha']['captcha_solution'] = array(
'#type' => 'value',
'#value' => $captcha['solution'],
);
$form['captcha']['captcha_token'] = array(
'#type' => 'hidden',
'#value' => md5(mt_rand()),
);
$form['captcha']['validationdata'] = array(
'#type' => 'value',
'#value' => array(
'form_id' => $form_id,
'preprocess' => isset($captcha['preprocess']) ? $captcha['preprocess'] : FALSE,
'module' => $captcha_point->module,
'type' => $captcha_point->type,
),
);
$form['#pre_render'][] = 'captcha_pre_render';
$form['#pre_render'][] = 'captcha_pre_render_place_captcha';
$form['captcha']['#validate']['captcha_validate'] = array();
}
elseif (user_access('administer CAPTCHA settings') && variable_get('captcha_administration_mode', FALSE) && arg(0) != 'admin') {
$result = db_query("SELECT module, type FROM {captcha_points} WHERE form_id = '%s'", $form_id);
if (!$result) {
return;
}
$captcha_point = db_fetch_object($result);
$form['captcha'] = array(
'#type' => 'fieldset',
'#title' => t('CAPTCHA'),
'#collapsible' => TRUE,
'#collapsed' => TRUE,
);
if ($captcha_point && $captcha_point->type) {
$form['captcha']['#description'] = t('Untrusted users will see a CAPTCHA here (!settings).', array(
'!settings' => l(t('general CAPTCHA settings'), 'admin/user/captcha'),
));
$form['captcha']['challenge'] = array(
'#type' => 'item',
'#title' => t('Enabled challenge'),
'#value' => t('"@type" by module "@module" (!change, !disable)', array(
'@type' => $captcha_point->type,
'@module' => $captcha_point->module,
'!change' => l(t('change'), "admin/user/captcha/captcha/captcha_point/{$form_id}", array(), drupal_get_destination()),
'!disable' => l(t('disable'), "admin/user/captcha/captcha/captcha_point/{$form_id}/disable", array(), drupal_get_destination()),
)),
);
}
else {
$form['captcha']['add_captcha'] = array(
'#value' => l(t('Place a CAPTCHA here for untrusted users.'), "admin/user/captcha/captcha/captcha_point/{$form_id}", array(), drupal_get_destination()),
);
}
$form['#pre_render'] = (array) $form['#pre_render'] + array(
'captcha_pre_render_place_captcha',
);
}
}
function captcha_validate($form_values) {
if (!isset($_SESSION['captcha'])) {
form_set_error('captcha', t('Cookies should be enabled in your browser for CAPTCHA validation.'));
return;
}
$captcha_response = $form_values['#post']['captcha_response'];
$validationdata = $form_values['validationdata']['#value'];
if ($validationdata['preprocess']) {
$captcha_response = module_invoke($validationdata['module'], 'captcha', 'preprocess', $validationdata['type'], $captcha_response);
}
$form_id = $validationdata['form_id'];
$captcha_token = $form_values['#post']['captcha_token'];
if (!isset($_SESSION['captcha'][$form_id][$captcha_token])) {
form_set_error('captcha_token', t('Invalid CAPTCHA token.'));
}
if ($captcha_response === $_SESSION['captcha'][$form_id][$captcha_token]) {
$_SESSION['captcha'][$form_id]['success'] = TRUE;
$_SESSION['captcha']['success'] = TRUE;
}
else {
form_set_error('captcha_response', t('The answer you entered for the CAPTCHA was not correct.'));
variable_set('captcha_wrong_response_counter', variable_get('captcha_wrong_response_counter', 0) + 1);
if (variable_get('captcha_log_wrong_responses', FALSE)) {
watchdog('CAPTCHA', t('%form_id post blocked by CAPTCHA module: challenge "%challenge" (by module "%module"), user answered "%response", but the solution was "%solution".', array(
'%form_id' => $form_id,
'%response' => $captcha_response,
'%solution' => $_SESSION['captcha'][$form_id][$captcha_token],
'%challenge' => $validationdata['type'],
'%module' => $validationdata['module'],
)), WATCHDOG_NOTICE);
}
if ($form_id == 'user_login' || $form_id == 'user_login_block') {
drupal_goto($_GET['q']);
}
}
unset($_SESSION['captcha'][$form_id][$captcha_token]);
}
function captcha_pre_render($form_id, &$form) {
if (_captcha_persistence_skip($form_id)) {
unset($form['captcha']);
return;
}
if (count($_SESSION['captcha'][$form_id]) - 1 > CAPTCHA_UNSOLVED_CHALLENGES_MAX) {
foreach (array_keys($_SESSION['captcha'][$form_id]) as $captcha_token) {
if ($captcha_token != 'success') {
unset($_SESSION['captcha'][$form_id][$captcha_token]);
break;
}
}
}
$captcha_token = $form['captcha']['captcha_token']['#value'];
$_SESSION['captcha'][$form_id][$captcha_token] = $form['captcha']['captcha_solution']['#value'];
$_SESSION['captcha'][$form_id]['success'] = FALSE;
$form['captcha']['captcha_response']['#value'] = '';
}
function captcha_pre_render_place_captcha($form_id, &$form) {
$button_weights = array();
foreach (element_children($form) as $key) {
if ($form[$key]['#type'] == 'submit' || $form[$key]['#type'] == 'button') {
$button_weights[] = $form[$key]['#weight'];
}
}
if ($button_weights) {
$first_button_weight = min($button_weights);
$form['captcha']['#weight'] = $first_button_weight - 0.5 / 1000.0;
unset($form['#sorted']);
}
}
function captcha_examples($module = NULL, $challenge = NULL) {
if ($module && $challenge) {
$output = '';
for ($i = 0; $i < 10; $i++) {
$captcha = call_user_func_array($module . '_captcha', array(
'generate',
$challenge,
));
$form = $captcha['form'];
$id = "captcha_examples_{$module_}{$challenge_}{$i}";
drupal_process_form($id, $form);
$output .= drupal_render_form($id, $form);
}
}
else {
$output = t('This page gives an overview of all available challenge types, generated with their current settings.');
foreach (module_implements('captcha') as $module) {
$challenges = call_user_func_array($module . '_captcha', array(
'list',
));
if ($challenges) {
foreach ($challenges as $challenge) {
$captcha = call_user_func_array($module . '_captcha', array(
'generate',
$challenge,
));
$form = array();
$form['captcha'] = array(
'#type' => 'fieldset',
'#title' => t('Challenge "%challenge" by module "%module"', array(
'%challenge' => $challenge,
'%module' => $module,
)),
);
$form['captcha'] = array_merge($form['captcha'], $captcha['form']);
$form['captcha']['more_examples'] = array(
'#type' => 'markup',
'#value' => l(t('10 more examples of this challenge.'), "admin/user/captcha/captcha/examples/{$module}/{$challenge}"),
);
$id = "captcha_examples_{$module_}{$challenge}";
drupal_process_form($id, $form);
$output .= drupal_render_form($id, $form);
}
}
}
}
return $output;
}
function captcha_captcha($op, $captcha_type = '') {
switch ($op) {
case 'list':
return array(
'Math',
);
case 'generate':
if ($captcha_type == 'Math') {
$result = array();
$answer = mt_rand(1, 20);
$x = mt_rand(1, $answer);
$y = $answer - $x;
$result['solution'] = "{$answer}";
$result['form']['captcha_response'] = array(
'#type' => 'textfield',
'#title' => t('Math Question'),
'#description' => t('Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.'),
'#field_prefix' => t('@x + @y = ', array(
'@x' => $x,
'@y' => $y,
)),
'#size' => 4,
'#maxlength' => 2,
'#required' => TRUE,
);
return $result;
}
}
}
