<?php

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namespace WPForms\Frontend;

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/**

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* Captcha class.

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*

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* @since 1.8.1

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*/

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class Captcha {

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/**

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* Initialize class.

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*

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* @since 1.8.1

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*/

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public function init() {

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$this->hooks();

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}

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/**

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* Register hooks.

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*

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* @since 1.8.1

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*/

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private function hooks() {

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// Filters.

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add_filter( 'script_loader_tag', [ $this, 'set_defer_attribute' ], 10, 3 );

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// Actions.

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add_action( 'wpforms_frontend_output', [ $this, 'recaptcha' ], 20, 5 );

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add_action( 'wp_enqueue_scripts', [ $this, 'recaptcha_noconflict' ], 9999 );

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add_action( 'wp_footer', [ $this, 'recaptcha_noconflict' ], 19 );

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add_action( 'wpforms_wp_footer', [ $this, 'assets_recaptcha' ] );

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}

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/**

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* CAPTCHA output if configured.

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*

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* @since 1.8.1

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*

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* @param array $form_data Form data and settings.

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* @param null $deprecated Deprecated in v1.3.7, previously was $form object.

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* @param bool $title Whether to display form title.

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* @param bool $description Whether to display form description.

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* @param array $errors List of all errors filled in WPForms_Process::process().

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*

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* @noinspection HtmlUnknownAttribute

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* @noinspection PhpUnusedParameterInspection

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*/

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public function recaptcha( $form_data, $deprecated, $title, $description, $errors ) {

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// Check that CAPTCHA is configured in the settings.

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$captcha_settings = $this->get_form_captcha_settings( $form_data );

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if ( ! $captcha_settings ) {

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return;

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}

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$frontend = wpforms()->obj( 'frontend' );

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$container_classes = [ 'wpforms-recaptcha-container', 'wpforms-is-' . $captcha_settings['provider'] ];

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if ( $captcha_settings['provider'] === 'recaptcha' ) {

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$container_classes[] = 'wpforms-is-recaptcha-type-' . $captcha_settings['recaptcha_type'];

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}

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printf(

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'<div class="%1$s" %2$s>',

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wpforms_sanitize_classes( $container_classes, true ),

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$frontend->pages ? 'style="display:none;"' : ''

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);

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$this->print_recaptcha_fields( $captcha_settings, $form_data );

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if ( ! empty( $errors['recaptcha'] ) ) {

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$frontend->form_error( 'recaptcha', $errors['recaptcha'] );

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}

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echo '</div>';

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}

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/**

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* Get recaptcha data.

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*

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* @since 1.8.6

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*

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* @param array $captcha_settings Captcha settings.

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* @param array $form_data Form data and settings.

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*

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* @return array

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*/

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private function get_recaptcha_data( array $captcha_settings, array $form_data ): array {

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/**

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* Filters captcha sitekey.

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*

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* @since 1.7.1

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*

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* @param array $sitekey Sitekey.

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* @param array $form_data Form data and settings.

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*/

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$data = apply_filters( // phpcs:ignore WPForms.PHP.ValidateHooks.InvalidHookName

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'wpforms_frontend_recaptcha',

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[ 'sitekey' => $captcha_settings['site_key'] ],

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$form_data

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);

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$is_recaptcha = $captcha_settings['provider'] === 'recaptcha';

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$is_turnstile = $captcha_settings['provider'] === 'turnstile';

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if ( $is_recaptcha && $captcha_settings['recaptcha_type'] === 'invisible' ) {

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$data['size'] = 'invisible';

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}

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if ( ! $is_turnstile ) {

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return $data;

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}

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/**

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* Filter Turnstile action value.

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*

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* @since 1.8.1

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*

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* @param string $action Action value. Can only contain up to 32 alphanumeric characters including _ and -.

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* @param array $form_data Form data and settings.

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*/

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$data['action'] = apply_filters( // phpcs:ignore WPForms.PHP.ValidateHooks.InvalidHookName

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'wpforms_frontend_recaptcha_turnstile_action',

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sprintf(

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'FormID-%d',

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$form_data['id']

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),

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$form_data

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);

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return $data;

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}

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/**

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* Print recaptcha fields.

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*

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* @since 1.8.6

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*

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* @param array $captcha_settings Captcha settings.

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* @param array $form_data Form data and settings.

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*/

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private function print_recaptcha_fields( array $captcha_settings, array $form_data ) {

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$data = $this->get_recaptcha_data( $captcha_settings, $form_data );

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$is_recaptcha = $captcha_settings['provider'] === 'recaptcha';

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$is_recaptcha_v3 = $is_recaptcha && $captcha_settings['recaptcha_type'] === 'v3';

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if ( $is_recaptcha_v3 ) {

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// The value adds via JS code.

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echo '<input type="hidden" name="wpforms[recaptcha]" value="">';

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return;

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}

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echo '<div ' . wpforms_html_attributes( '', [ 'g-recaptcha' ], $data ) . '></div>';

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if ( $is_recaptcha && $captcha_settings['recaptcha_type'] === 'invisible' ) {

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return;

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}

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printf(

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'<input type="text" name="g-recaptcha-hidden" class="wpforms-recaptcha-hidden" style="position:absolute!important;clip:rect(0,0,0,0)!important;height:1px!important;width:1px!important;border:0!important;overflow:hidden!important;padding:0!important;margin:0!important;" data-rule-%1$s="1">',

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esc_attr( $captcha_settings['provider'] )

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);

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}

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/**

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* Get captcha settings for form output.

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* Return null if captcha is disabled.

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*

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* @since 1.8.1

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*

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* @param array $form_data Form data and settings.

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*

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* @return array|null

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* @noinspection NullPointerExceptionInspection

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*/

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private function get_form_captcha_settings( $form_data ) {

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$captcha_settings = wpforms_get_captcha_settings();

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if (

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empty( $captcha_settings['provider'] ) ||

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$captcha_settings['provider'] === 'none' ||

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empty( $captcha_settings['site_key'] ) ||

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empty( $captcha_settings['secret_key'] )

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) {

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return null;

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}

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// Check that the CAPTCHA is configured for the specific form.

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if (

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! isset( $form_data['settings']['recaptcha'] ) ||

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$form_data['settings']['recaptcha'] !== '1'

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) {

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return null;

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}

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$is_recaptcha_v3 = $captcha_settings['provider'] === 'recaptcha' && $captcha_settings['recaptcha_type'] === 'v3';

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if ( wpforms()->obj( 'amp' )->output_captcha( $is_recaptcha_v3, $captcha_settings, $form_data ) ) {

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return null;

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}

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return $captcha_settings;

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}

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/**

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* Google reCAPTCHA no-conflict mode.

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*

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* When enabled in the WPForms settings, forcefully remove all other

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* reCAPTCHA enqueues to prevent conflicts. Filter can be used to target

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* specific pages, etc.

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*

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* @since 1.4.5

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* @since 1.6.4 Added hCaptcha support.

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*/

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public function recaptcha_noconflict() {

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$captcha_settings = wpforms_get_captcha_settings();

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if (

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empty( $captcha_settings['provider'] ) ||

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$captcha_settings['provider'] === 'none' ||

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empty( wpforms_setting( 'recaptcha-noconflict' ) ) ||

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/**

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* Filters recaptcha no conflict flag.

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*

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* @since 1.6.4

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*

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* @param bool $recaptcha_no_conflict No conflict flag.

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*/

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! apply_filters( 'wpforms_frontend_recaptcha_noconflict', true ) // phpcs:ignore WPForms.PHP.ValidateHooks.InvalidHookName

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) {

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return;

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}

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$scripts = wp_scripts();

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$urls = [ 'google.com/recaptcha', 'gstatic.com/recaptcha', 'hcaptcha.com/1' ];

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foreach ( $scripts->queue as $handle ) {

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// Skip the WPForms javascript-assets.

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if (

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! isset( $scripts->registered[ $handle ] ) ||

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false !== strpos( $scripts->registered[ $handle ]->handle, 'wpforms' )

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) {

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return;

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}

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foreach ( $urls as $url ) {

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if ( false !== strpos( $scripts->registered[ $handle ]->src, $url ) ) {

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wp_dequeue_script( $handle );

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wp_deregister_script( $handle );

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break;

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}

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}

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}

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}

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/**

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* Load the assets needed for the CAPTCHA.

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*

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* @since 1.6.2

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* @since 1.6.4 Added hCaptcha support.

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*

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* @param array $forms Forms being displayed.

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*/

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public function assets_recaptcha( $forms ) {

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$captcha_settings = $this->get_assets_captcha_settings( $forms );

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if ( ! $captcha_settings ) {

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return;

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}

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$is_recaptcha_v3 = $captcha_settings['provider'] === 'recaptcha' && $captcha_settings['recaptcha_type'] === 'v3';

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$recaptcha_url = $is_recaptcha_v3 ?

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'https://www.google.com/recaptcha/api.js?render=' . $captcha_settings['site_key'] :

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/**

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* For backward compatibility reason we have to filter only the v2 reCAPTCHA.

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*

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* @since 1.4.0

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*

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* @param string $url The reCaptcha v2 URL.

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*/

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apply_filters( 'wpforms_frontend_recaptcha_url', 'https://www.google.com/recaptcha/api.js?onload=wpformsRecaptchaLoad&render=explicit' ); // phpcs:ignore WPForms.PHP.ValidateHooks.InvalidHookName

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$captcha_api_array = [

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'hcaptcha' => 'https://hcaptcha.com/1/api.js?onload=wpformsRecaptchaLoad&render=explicit',

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'recaptcha' => $recaptcha_url,

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'turnstile' => 'https://challenges.cloudflare.com/turnstile/v0/api.js?onload=wpformsRecaptchaLoad&render=explicit',

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];

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/**

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* Filter the CAPTCHA API URL.

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*

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* @since 1.6.4

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*

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* @param string $captcha_api The CAPTCHA API URL.

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*/

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$captcha_api = apply_filters( 'wpforms_frontend_captcha_api', $captcha_api_array[ $captcha_settings['provider'] ] );

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$in_footer = ! wpforms_is_frontend_js_header_force_load();

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wp_enqueue_script(

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'wpforms-recaptcha',

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$captcha_api,

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$is_recaptcha_v3 ? [] : [ 'jquery' ],

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null, // phpcs:ignore WordPress.WP.EnqueuedResourceParameters.MissingVersion

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$in_footer

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);

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/**

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* Filter the string containing the CAPTCHA JavaScript to be added.

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*

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* @since 1.6.4

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*

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* @param string $captcha_inline The CAPTCHA JavaScript.

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*/

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$captcha_inline = apply_filters(

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'wpforms_frontend_captcha_inline_script',

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$this->get_captcha_inline_script( $captcha_settings )

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);

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wp_add_inline_script( 'wpforms-recaptcha', $captcha_inline );

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}

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/**

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* Get captcha settings for assets output.

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* Return null if captcha is disabled.

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*

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* @since 1.8.1

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*

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* @param array $forms Forms being displayed.

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*

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* @return array|null

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* @noinspection NullPointerExceptionInspection

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*/

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private function get_assets_captcha_settings( $forms ) {

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/**

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* Filters disable captcha switch.

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*

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* @since 1.6.2

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*

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* @param bool $is_captcha_disabled Whether captcha is disabled.

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*/

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if ( apply_filters( 'wpforms_frontend_recaptcha_disable', false ) ) { // phpcs:ignore WPForms.PHP.ValidateHooks.InvalidHookName

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return null;

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}

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// Load CAPTCHA support if form supports it.

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$captcha_settings = wpforms_get_captcha_settings();

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if (

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empty( $captcha_settings['provider'] ) ||

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$captcha_settings['provider'] === 'none' ||

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empty( $captcha_settings['site_key'] ) ||

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empty( $captcha_settings['secret_key'] )

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) {

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return null;

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}

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// Whether at least 1 form on a page has CAPTCHA enabled.

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$captcha = false;

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foreach ( $forms as $form ) {

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if ( ! empty( $form['settings']['recaptcha'] ) ) {

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$captcha = true;

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break;

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}

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}

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// Return early.

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if ( ! $captcha && ! wpforms()->obj( 'frontend' )->assets_global() ) {

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return null;

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}

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return $captcha_settings;

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}

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/**

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* Retrieve the string containing the CAPTCHA inline javascript.

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*

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* @since 1.6.4

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*

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* @param array $captcha_settings The CAPTCHA settings.

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*

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* @return string

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* @noinspection JSUnusedLocalSymbols

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* @noinspection UnnecessaryLocalVariableJS

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* @noinspection JSUnresolvedVariable

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* @noinspection JSDeprecatedSymbols

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* @noinspection JSUnresolvedFunction

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*/

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protected function get_captcha_inline_script( $captcha_settings ) {

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// IE11 polyfills for native `matches()` and `closest()` methods.

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$polyfills = /** @lang JavaScript */

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'if (!Element.prototype.matches) {

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Element.prototype.matches = Element.prototype.msMatchesSelector || Element.prototype.webkitMatchesSelector;

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}

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if (!Element.prototype.closest) {

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Element.prototype.closest = function (s) {

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var el = this;

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do {

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if (Element.prototype.matches.call(el, s)) { return el; }

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el = el.parentElement || el.parentNode;

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} while (el !== null && el.nodeType === 1);

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return null;

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};

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}

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';

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// Native equivalent for jQuery's `trigger()` method.

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$dispatch = /** @lang JavaScript */

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'var wpformsDispatchEvent = function (el, ev, custom) {

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var e = document.createEvent(custom ? "CustomEvent" : "HTMLEvents");

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custom ? e.initCustomEvent(ev, true, true, false) : e.initEvent(ev, true, true);

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el.dispatchEvent(e);

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};

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';

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// Update container class after changing Turnstile type.

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$turnstile_update_class = /** @lang JavaScript */

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'var turnstileUpdateContainer = function (el) {

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let form = el.closest( "form" ),

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iframeWrapperHeight = el.offsetHeight;

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parseInt(iframeWrapperHeight) === 0 ?

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form.querySelector(".wpforms-is-turnstile").classList.add( "wpforms-is-turnstile-invisible" ) :

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form.querySelector(".wpforms-is-turnstile").classList.remove( "wpforms-is-turnstile-invisible" );

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};

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';

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// Captcha callback, used by hCaptcha and checkbox reCaptcha v2.

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$callback = /** @lang JavaScript */

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'var wpformsRecaptchaCallback = function (el) {

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var hdn = el.parentNode.querySelector(".wpforms-recaptcha-hidden");

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var err = el.parentNode.querySelector("#g-recaptcha-hidden-error");

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hdn.value = "1";

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wpformsDispatchEvent(hdn, "change", false);

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hdn.classList.remove("wpforms-error");

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err && hdn.parentNode.removeChild(err);

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};

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';

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$sync = /** @lang JavaScript */

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'const wpformsRecaptchaSync = ( func ) => {

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return function() {

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const context = this;

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const args = arguments;

[460] Fix | Delete

[461] Fix | Delete

// Sync with jQuery ready event.

[462] Fix | Delete

jQuery( document ).ready( function() {

[463] Fix | Delete

func.apply( context, args );

[464] Fix | Delete

} );

[465] Fix | Delete

}

[466] Fix | Delete

};

[467] Fix | Delete

';

[468] Fix | Delete

[469] Fix | Delete

if ( $captcha_settings['provider'] === 'hcaptcha' ) {

[470] Fix | Delete

$data = $dispatch;

[471] Fix | Delete

$data .= $callback;

[472] Fix | Delete

[473] Fix | Delete

$data .= /** @lang JavaScript */

[474] Fix | Delete

'var wpformsRecaptchaLoad = function () {

[475] Fix | Delete

Array.prototype.forEach.call(document.querySelectorAll(".g-recaptcha"), function (el) {

[476] Fix | Delete

var captchaID = hcaptcha.render(el, {

[477] Fix | Delete

callback: function () {

[478] Fix | Delete

wpformsRecaptchaCallback(el);

[479] Fix | Delete

}

[480] Fix | Delete

});

[481] Fix | Delete

el.setAttribute("data-recaptcha-id", captchaID);

[482] Fix | Delete

});

[483] Fix | Delete

wpformsDispatchEvent(document, "wpformsRecaptchaLoaded", true);

[484] Fix | Delete

};

[485] Fix | Delete

';

[486] Fix | Delete

[487] Fix | Delete

return $data;

[488] Fix | Delete

}

[489] Fix | Delete

[490] Fix | Delete

if ( $captcha_settings['provider'] === 'turnstile' ) {

[491] Fix | Delete

$data = $dispatch;

[492] Fix | Delete

$data .= $callback;

[493] Fix | Delete

$data .= $turnstile_update_class;

[494] Fix | Delete

[495] Fix | Delete

$data .= /** @lang JavaScript */

[496] Fix | Delete

'var wpformsRecaptchaLoad = function () {

[497] Fix | Delete

Array.prototype.forEach.call(document.querySelectorAll(".g-recaptcha"), function (el) {

[498] Fix | Delete

let form = el.closest( "form" ),

[499] Fix | Delete