recaptcha.module in reCAPTCHA 7
Same filename and directory in other branches
Uses the reCAPTCHA web service to improve the CAPTCHA system.
File
recaptcha.moduleView source
<?php
/**
* @file
* Uses the reCAPTCHA web service to improve the CAPTCHA system.
*/
/**
* Implements hook_help().
*/
function recaptcha_help($path, $arg) {
$output = '';
switch ($path) {
case 'admin/modules#name':
$output .= t('reCAPTCHA');
break;
case 'admin/modules#description':
case 'admin/user/captcha/recaptcha':
$output .= t('Uses the <a href="@url" target="_blank">reCAPTCHA</a> web service to improve the CAPTCHA system and protect email addresses.', array(
'@url' => url('https://www.google.com/recaptcha'),
));
break;
case 'admin/help#recaptcha':
$output .= '<p>' . t('Uses the reCAPTCHA web service to improve the CAPTCHA module and protect email addresses. For more information on what reCAPTCHA is, visit <a href="@url" target="_blank">the official website</a>.', array(
'@url' => url('https://www.google.com/recaptcha'),
)) . '</p><h3>' . t('Configuration') . '</h3><p>' . t('The settings associated with reCAPTCHA can be found in the <a href="@recaptchatab">reCAPTCHA tab</a>, in the <a href="@captchasettings">CAPTCHA settings</a>. You must set your public and private reCAPTCHA keys in order to use the module. Once the public and private keys are set, visit the <a href="@captchasettings">CAPTCHA settings</a>, where you can choose where reCAPTCHA should be displayed.', array(
'@recaptchatab' => url('admin/user/captcha/recaptcha'),
'@captchasettings' => url('admin/user/captcha'),
)) . '</p>';
break;
}
return $output;
}
/**
* Implements hook_menu().
*/
function recaptcha_menu() {
$items = array();
$items['admin/config/people/captcha/recaptcha'] = array(
'title' => 'reCAPTCHA',
'description' => 'Administer the reCAPTCHA web service.',
'page callback' => 'drupal_get_form',
'page arguments' => array(
'recaptcha_admin_settings',
),
'access arguments' => array(
'administer recaptcha',
),
'type' => MENU_LOCAL_TASK,
'file' => 'recaptcha.admin.inc',
);
return $items;
}
/**
* Implements hook_permission().
*/
function recaptcha_permission() {
return array(
'administer recaptcha' => array(
'title' => t('reCaptcha Administration'),
'description' => t('Administer reCaptcha settings'),
),
);
}
/**
* Implements hook_captcha().
*/
function recaptcha_captcha($op, $captcha_type = '') {
switch ($op) {
case 'list':
return array(
'reCAPTCHA',
);
case 'generate':
$captcha = array();
if ($captcha_type == 'reCAPTCHA') {
// Retrieve configuration variables.
$recaptcha_theme = variable_get('recaptcha_theme', 'red');
$recaptcha_tabindex = variable_get('recaptcha_tabindex', NULL);
$recaptcha_public_key = variable_get('recaptcha_public_key', FALSE);
$recaptcha_ajax_api = variable_get('recaptcha_ajax_api', FALSE);
// Test if reCAPTCHA can be used, falling back to Math if it is not
// configured, the library won't load, or the server is down.
if (!$recaptcha_public_key || !_recaptcha_load_library() || !_recaptcha_server_is_up()) {
return captcha_captcha('generate', 'Math');
}
if ($recaptcha_ajax_api) {
// By default CAPTCHA turns off page caching on any page where a
// CAPTCHA challenge appears. If recaptcha is using AJAX API, set
// caching back to its old state as stored in DB.
global $conf;
$conf['cache'] = unserialize(db_query("SELECT value FROM {variable} WHERE name = 'cache'")
->fetchField());
}
$recaptcha_options = array(
'theme' => $recaptcha_theme,
);
// Localization support.
global $language;
if (isset($language->language)) {
// reCAPTCHA uses two-character language codes, so 'pt-br' must be
// passed as 'pt'.
$recaptcha_options['lang'] = drupal_substr($language->language, 0, 2);
}
// Construct the Javascript, but only display it once.
static $_recaptcha_jsadded = FALSE;
if ($_recaptcha_jsadded == FALSE && $recaptcha_ajax_api == FALSE) {
$_recaptcha_jsadded = TRUE;
// Add support to display the custom theme.
if ($recaptcha_theme == 'custom') {
$recaptcha_options['custom_theme_widget'] = 'recaptcha_custom_theme_widget';
}
// Set the default tab index.
if (!empty($recaptcha_tabindex)) {
$recaptcha_options['tabindex'] = $recaptcha_tabindex;
}
drupal_add_js('var RecaptchaOptions = ' . drupal_json_encode($recaptcha_options) . ';', array(
'type' => 'inline',
));
}
// Create the form. Captcha requires TRUE to be returned in solution.
$captcha['solution'] = TRUE;
$captcha['captcha_validate'] = 'recaptcha_captcha_validation';
// If 'Disable Client-Side Cookies' is set, then add query string to
// end of the public key string before passing to recaptchalib.
if (variable_get('recaptcha_nocookies', FALSE)) {
$recaptcha_public_key .= '&nocookie=1';
}
$captcha['form']['captcha_response'] = array(
'#type' => 'hidden',
'#value' => 'reCAPTCHA',
);
// Expose the form, either straight HTML, or using the AJAX API.
// Build the custom theme HTML if necessary.
$recaptcha_custom_html = $recaptcha_theme == 'custom' ? theme('recaptcha_custom_widget') : '';
if ($recaptcha_ajax_api == FALSE) {
// Only generate recaptcha_get_html() if we're not using the AJAX API.
$html = recaptcha_get_html($recaptcha_public_key, NULL, TRUE);
$captcha['form']['captcha_form'] = array(
'#type' => 'item',
'#markup' => (!empty($recaptcha_custom_html) ? '<div id="recaptcha_custom_theme_widget">' . $recaptcha_custom_html . '</div>' : '') . $html,
);
}
else {
$captcha['form']['captcha_form'] = array(
'#type' => 'item',
// Create the destination container, inserting any custom theme HTML
// necessary ($recaptcha_custom_html will be empty if we are not
// using custom theme).
'#markup' => '<div id="recaptcha_ajax_api_container">' . $recaptcha_custom_html . '</div>',
);
drupal_add_js('https://www.google.com/recaptcha/api/js/recaptcha_ajax.js', array(
'type' => 'external',
));
$recaptcha_options['public_key'] = $recaptcha_public_key;
$recaptcha_options['container'] = 'recaptcha_ajax_api_container';
drupal_add_js(array(
'recaptcha' => $recaptcha_options,
), 'setting');
drupal_add_js(drupal_get_path('module', 'recaptcha') . '/recaptcha.js');
}
}
return $captcha;
}
}
/**
* Test whether the reCAPTCHA server is up.
*
* @return bool
* TRUE if the reCAPTCHA server is up, FALSE otherwise.
*/
function _recaptcha_test_recaptcha_server() {
$response = drupal_http_request('https://' . RECAPTCHA_VERIFY_SERVER);
if (empty($response->error)) {
return TRUE;
}
else {
watchdog('reCAPTCHA', 'Unable to connect with the reCAPTCHA server (@server): @errno: @errstr', array(
'@server' => RECAPTCHA_VERIFY_SERVER,
'@errno' => $response->code,
'@errstr' => $response->error,
), WATCHDOG_ERROR);
return FALSE;
}
}
/**
* Return the cached output of _recaptcha_test_recaptcha_server().
*
* @return bool
* TRUE if the reCAPTCHA server was up last time it was checked, FALSE
* otherwise.
*/
function _recaptcha_server_is_up() {
static $server_status;
// Use static cache value, if available.
if (isset($server_status)) {
return $server_status;
}
// Check if the status is cached already.
$status_cache = cache_get('recaptcha_server_status');
if ($status_cache !== FALSE) {
$server_status = (bool) $status_cache;
return $server_status;
}
// Status is not cached. Check if server is up.
$server_status = _recaptcha_test_recaptcha_server();
// Set to 5 minutes, if interval is not set.
$cache_period = variable_get('recaptcha_server_status_check_interval', 5);
// Save it as integer as cache_get returns FALSE, if not found.
cache_set('recaptcha_server_status', (int) $server_status, 'cache', time() + $cache_period * 60);
return $server_status;
}
/**
* CAPTCHA Callback; Validates the reCAPTCHA code.
*/
function recaptcha_captcha_validation($solution = NULL, $response = NULL) {
global $user;
$recaptcha_private_key = variable_get('recaptcha_private_key', FALSE);
$ip_address = ip_address();
if ($recaptcha_private_key && $ip_address && $response === 'reCAPTCHA' && !empty($_POST['recaptcha_challenge_field']) && !empty($_POST['recaptcha_response_field']) && _recaptcha_server_is_up()) {
$resp = recaptcha_check_answer($recaptcha_private_key, $ip_address, check_plain($_POST['recaptcha_challenge_field']), check_plain($_POST['recaptcha_response_field']));
return $resp->is_valid;
}
return FALSE;
}
/**
* Implements hook_theme().
*/
function recaptcha_theme() {
return array(
'recaptcha_custom_widget' => array(
'arguments' => array(),
),
);
}
/**
* Theme function: creates the custom themed recaptcha widget.
*
* @ingroup themeable
*/
function theme_recaptcha_custom_widget() {
$recaptcha_only_if_incorrect_sol = t('Incorrect please try again');
$recaptcha_only_if_image_enter = t('Enter the words above:');
$recaptcha_only_if_audio_enter = t('Enter the words you hear:');
$recaptcha_get_another_captcha = t('Get another CAPTCHA');
$recaptcha_only_if_image = t('Get an audio CAPTCHA');
$recaptcha_only_if_audio = t('Get an image CAPTCHA');
$help = t('Help');
return <<<EOT
<div id="recaptcha_image"></div>
<div class="recaptcha_only_if_incorrect_sol" style="color:red">{<span class="php-variable">$recaptcha_only_if_incorrect_sol</span>}</div>
<span class="recaptcha_only_if_image">{<span class="php-variable">$recaptcha_only_if_image_enter</span>}</span>
<span class="recaptcha_only_if_audio">{<span class="php-variable">$recaptcha_only_if_audio_enter</span>}</span>
<input type="text" id="recaptcha_response_field" name="recaptcha_response_field" />
<div class="recaptcha_get_another_captcha"><a href="javascript:Recaptcha.reload()">{<span class="php-variable">$recaptcha_get_another_captcha</span>}</a></div>
<div class="recaptcha_only_if_image"><a href="javascript:Recaptcha.switch_type('audio')">{<span class="php-variable">$recaptcha_only_if_image</span>}</a></div>
<div class="recaptcha_only_if_audio"><a href="javascript:Recaptcha.switch_type('image')">{<span class="php-variable">$recaptcha_only_if_audio</span>}</a></div>
<div class="recaptcha_help"><a href="javascript:Recaptcha.showhelp()">{<span class="php-variable">$help</span>}</a></div>
EOT;
}
/**
* Load the recaptcha library.
*/
function _recaptcha_load_library() {
return module_load_include('php', 'recaptcha', 'recaptcha-php-1.11/recaptchalib');
}
Functions
Name | Description |
---|---|
recaptcha_captcha | Implements hook_captcha(). |
recaptcha_captcha_validation | CAPTCHA Callback; Validates the reCAPTCHA code. |
recaptcha_help | Implements hook_help(). |
recaptcha_menu | Implements hook_menu(). |
recaptcha_permission | Implements hook_permission(). |
recaptcha_theme | Implements hook_theme(). |
theme_recaptcha_custom_widget | Theme function: creates the custom themed recaptcha widget. |
_recaptcha_load_library | Load the recaptcha library. |
_recaptcha_server_is_up | Return the cached output of _recaptcha_test_recaptcha_server(). |
_recaptcha_test_recaptcha_server | Test whether the reCAPTCHA server is up. |