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<?php
add_action( 'wpcf7_init', 'wpcf7_recaptcha_register_service', 10, 0 );
function wpcf7_recaptcha_register_service() {
$integration = WPCF7_Integration::get_instance();
$integration->add_category( 'captcha',
__( 'CAPTCHA', 'contact-form-7' )
);
$integration->add_service( 'recaptcha',
WPCF7_RECAPTCHA::get_instance()
);
}
add_action( 'wp_enqueue_scripts', 'wpcf7_recaptcha_enqueue_scripts', 10, 0 );
function wpcf7_recaptcha_enqueue_scripts() {
$service = WPCF7_RECAPTCHA::get_instance();
if ( ! $service->is_active() ) {
return;
}
$url = add_query_arg(
array(
'render' => $service->get_sitekey(),
),
'https://www.google.com/recaptcha/api.js'
);
wp_enqueue_script( 'google-recaptcha', $url, array(), '3.0', true );
}
add_filter( 'wpcf7_form_hidden_fields',
'wpcf7_recaptcha_add_hidden_fields', 100, 1 );
function wpcf7_recaptcha_add_hidden_fields( $fields ) {
return array_merge( $fields, array(
'g-recaptcha-response' => '',
) );
}
add_action( 'wp_footer', 'wpcf7_recaptcha_onload_script', 40, 0 );
function wpcf7_recaptcha_onload_script() {
$service = WPCF7_RECAPTCHA::get_instance();
if ( ! $service->is_active() ) {
return;
}
if ( ! wp_script_is( 'google-recaptcha', 'done' ) ) {
return;
}
?>
<script type="text/javascript">
( function( grecaptcha, sitekey ) {
var wpcf7recaptcha = {
execute: function() {
grecaptcha.execute(
sitekey,
{ action: 'homepage' }
).then( function( token ) {
var forms = document.getElementsByTagName( 'form' );
for ( var i = 0; i < forms.length; i++ ) {
var fields = forms[ i ].getElementsByTagName( 'input' );
for ( var j = 0; j < fields.length; j++ ) {
var field = fields[ j ];
if ( 'g-recaptcha-response' === field.getAttribute( 'name' ) ) {
field.setAttribute( 'value', token );
break;
}
}
}
} );
}
};
grecaptcha.ready( wpcf7recaptcha.execute );
document.addEventListener( 'wpcf7submit', wpcf7recaptcha.execute, false );
} )( grecaptcha, '<?php echo esc_js( $service->get_sitekey() ); ?>' );
</script>
<?php
}
add_filter( 'wpcf7_spam', 'wpcf7_recaptcha_verify_response', 9, 1 );
function wpcf7_recaptcha_verify_response( $spam ) {
if ( $spam ) {
return $spam;
}
$service = WPCF7_RECAPTCHA::get_instance();
if ( ! $service->is_active() ) {
return $spam;
}
$token = isset( $_POST['g-recaptcha-response'] )
? trim( $_POST['g-recaptcha-response'] ) : '';
return ! $service->verify( $token );
}
add_action( 'wpcf7_init', 'wpcf7_recaptcha_add_form_tag_recaptcha', 10, 0 );
function wpcf7_recaptcha_add_form_tag_recaptcha() {
$service = WPCF7_RECAPTCHA::get_instance();
if ( ! $service->is_active() ) {
return;
}
wpcf7_add_form_tag( 'recaptcha',
'__return_empty_string', // no output
array( 'display-block' => true )
);
}
add_action( 'wpcf7_upgrade', 'wpcf7_upgrade_recaptcha_v2_v3', 10, 2 );
function wpcf7_upgrade_recaptcha_v2_v3( $new_ver, $old_ver ) {
if ( version_compare( '5.1-dev', $old_ver, '<=' ) ) {
return;
}
$service = WPCF7_RECAPTCHA::get_instance();
if ( ! $service->is_active() ) {
return;
}
// Maybe v2 keys are used now. Warning necessary.
WPCF7::update_option( 'recaptcha_v2_v3_warning', true );
WPCF7::update_option( 'recaptcha', null );
}
add_action( 'wpcf7_admin_menu', 'wpcf7_admin_init_recaptcha_v2_v3', 10, 0 );
function wpcf7_admin_init_recaptcha_v2_v3() {
if ( ! WPCF7::get_option( 'recaptcha_v2_v3_warning' ) ) {
return;
}
add_filter( 'wpcf7_admin_menu_change_notice',
'wpcf7_admin_menu_change_notice_recaptcha_v2_v3', 10, 1 );
add_action( 'wpcf7_admin_warnings',
'wpcf7_admin_warnings_recaptcha_v2_v3', 5, 3 );
}
function wpcf7_admin_menu_change_notice_recaptcha_v2_v3( $counts ) {
$counts['wpcf7-integration'] += 1;
return $counts;
}
function wpcf7_admin_warnings_recaptcha_v2_v3( $page, $action, $object ) {
if ( 'wpcf7-integration' !== $page ) {
return;
}
$message = sprintf(
esc_html( __( "API keys for reCAPTCHA v3 are different from those for v2; keys for v2 don’t work with the v3 API. You need to register your sites again to get new keys for v3. For details, see %s.", 'contact-form-7' ) ),
wpcf7_link(
__( 'https://contactform7.com/recaptcha/', 'contact-form-7' ),
__( 'reCAPTCHA (v3)', 'contact-form-7' )
)
);
echo sprintf(
'<div class="notice notice-warning"><p>%s</p></div>',
$message
);
}
if ( ! class_exists( 'WPCF7_Service' ) ) {
return;
}
class WPCF7_RECAPTCHA extends WPCF7_Service {
private static $instance;
private $sitekeys;
public static function get_instance() {
if ( empty( self::$instance ) ) {
self::$instance = new self;
}
return self::$instance;
}
private function __construct() {
$this->sitekeys = WPCF7::get_option( 'recaptcha' );
}
public function get_title() {
return __( 'reCAPTCHA', 'contact-form-7' );
}
public function is_active() {
$sitekey = $this->get_sitekey();
$secret = $this->get_secret( $sitekey );
return $sitekey && $secret;
}
public function get_categories() {
return array( 'captcha' );
}
public function icon() {
}
public function link() {
echo wpcf7_link(
'https://www.google.com/recaptcha/intro/index.html',
'google.com/recaptcha'
);
}
public function get_sitekey() {
if ( empty( $this->sitekeys )
or ! is_array( $this->sitekeys ) ) {
return false;
}
$sitekeys = array_keys( $this->sitekeys );
return $sitekeys[0];
}
public function get_secret( $sitekey ) {
$sitekeys = (array) $this->sitekeys;
if ( isset( $sitekeys[$sitekey] ) ) {
return $sitekeys[$sitekey];
} else {
return false;
}
}
protected function log( $url, $request, $response ) {
wpcf7_log_remote_request( $url, $request, $response );
}
public function verify( $token ) {
$is_human = false;
if ( empty( $token ) or ! $this->is_active() ) {
return $is_human;
}
$endpoint = 'https://www.google.com/recaptcha/api/siteverify';
$sitekey = $this->get_sitekey();
$secret = $this->get_secret( $sitekey );
$request = array(
'body' => array(
'secret' => $secret,
'response' => $token,
),
);
$response = wp_remote_post( esc_url_raw( $endpoint ), $request );
if ( 200 != wp_remote_retrieve_response_code( $response ) ) {
if ( WP_DEBUG ) {
$this->log( $endpoint, $request, $response );
}
return $is_human;
}
$response_body = wp_remote_retrieve_body( $response );
$response_body = json_decode( $response_body, true );
$score = isset( $response_body['score'] ) ? $response_body['score'] : 0;
$threshold = 0.5;
$is_human = $threshold < $score;
$is_human = apply_filters( 'wpcf7_recaptcha_verify_response',
$is_human, $response_body );
return $is_human;
}
protected function menu_page_url( $args = '' ) {
$args = wp_parse_args( $args, array() );
$url = menu_page_url( 'wpcf7-integration', false );
$url = add_query_arg( array( 'service' => 'recaptcha' ), $url );
if ( ! empty( $args) ) {
$url = add_query_arg( $args, $url );
}
return $url;
}
protected function save_data() {
WPCF7::update_option( 'recaptcha', $this->sitekeys );
}
protected function reset_data() {
$this->sitekeys = null;
$this->save_data();
}
public function load( $action = '' ) {
if ( 'setup' == $action and 'POST' == $_SERVER['REQUEST_METHOD'] ) {
check_admin_referer( 'wpcf7-recaptcha-setup' );
if ( ! empty( $_POST['reset'] ) ) {
$this->reset_data();
$redirect_to = $this->menu_page_url( 'action=setup' );
} else {
$sitekey = isset( $_POST['sitekey'] ) ? trim( $_POST['sitekey'] ) : '';
$secret = isset( $_POST['secret'] ) ? trim( $_POST['secret'] ) : '';
if ( $sitekey and $secret ) {
$this->sitekeys = array( $sitekey => $secret );
$this->save_data();
$redirect_to = $this->menu_page_url( array(
'message' => 'success',
) );
} else {
$redirect_to = $this->menu_page_url( array(
'action' => 'setup',
'message' => 'invalid',
) );
}
}
if ( WPCF7::get_option( 'recaptcha_v2_v3_warning' ) ) {
WPCF7::update_option( 'recaptcha_v2_v3_warning', false );
}
wp_safe_redirect( $redirect_to );
exit();
}
}
public function admin_notice( $message = '' ) {
if ( 'invalid' == $message ) {
echo sprintf(
'<div class="error notice notice-error is-dismissible"><p><strong>%1$s</strong>: %2$s</p></div>',
esc_html( __( "ERROR", 'contact-form-7' ) ),
esc_html( __( "Invalid key values.", 'contact-form-7' ) ) );
}
if ( 'success' == $message ) {
echo sprintf( '<div class="updated notice notice-success is-dismissible"><p>%s</p></div>',
esc_html( __( 'Settings saved.', 'contact-form-7' ) ) );
}
}
public function display( $action = '' ) {
echo '<p>' . sprintf(
esc_html( __( 'reCAPTCHA protects you against spam and other types of automated abuse. With Contact Form 7’s reCAPTCHA integration module, you can block abusive form submissions by spam bots. For details, see %s.', 'contact-form-7' ) ),
wpcf7_link(
__( 'https://contactform7.com/recaptcha/', 'contact-form-7' ),
__( 'reCAPTCHA (v3)', 'contact-form-7' )
)
) . '</p>';
if ( $this->is_active() or 'setup' == $action ) {
$this->display_setup();
} else {
echo sprintf(
'<p><a href="%1$s" class="button">%2$s</a></p>',
esc_url( $this->menu_page_url( 'action=setup' ) ),
esc_html( __( 'Setup Integration', 'contact-form-7' ) )
);
}
}
private function display_setup() {
$sitekey = $this->is_active() ? $this->get_sitekey() : '';
$secret = $this->is_active() ? $this->get_secret( $sitekey ) : '';
?>
<form method="post" action="<?php echo esc_url( $this->menu_page_url( 'action=setup' ) ); ?>">
<?php wp_nonce_field( 'wpcf7-recaptcha-setup' ); ?>
<table class="form-table">
<tbody>
<tr>
<th scope="row"><label for="sitekey"><?php echo esc_html( __( 'Site Key', 'contact-form-7' ) ); ?></label></th>
<td><?php
if ( $this->is_active() ) {
echo esc_html( $sitekey );
echo sprintf(
'<input type="hidden" value="%1$s" id="sitekey" name="sitekey" />',
esc_attr( $sitekey )
);
} else {
echo sprintf(
'<input type="text" aria-required="true" value="%1$s" id="sitekey" name="sitekey" class="regular-text code" />',
esc_attr( $sitekey )
);
}
?></td>
</tr>
<tr>
<th scope="row"><label for="secret"><?php echo esc_html( __( 'Secret Key', 'contact-form-7' ) ); ?></label></th>
<td><?php
if ( $this->is_active() ) {
echo esc_html( wpcf7_mask_password( $secret ) );
echo sprintf(
'<input type="hidden" value="%1$s" id="secret" name="secret" />',
esc_attr( $secret )
);
} else {
echo sprintf(
'<input type="text" aria-required="true" value="%1$s" id="secret" name="secret" class="regular-text code" />',
esc_attr( $secret )
);
}
?></td>
</tr>
</tbody>
</table>
<?php
if ( $this->is_active() ) {
submit_button(
_x( 'Remove Keys', 'API keys', 'contact-form-7' ),
'small', 'reset'
);
} else {
submit_button( __( 'Save Changes', 'contact-form-7' ) );
}
?>
</form>
<?php
}
}