<?php
/**
 * Mailchimp Block.
 *
 * @since 7.1.0
 *
 * @package Jetpack
 */

namespace Automattic\Jetpack\Extensions\Mailchimp;

use Jetpack;
use Jetpack_AMP_Support;
use Jetpack_Gutenberg;
use Jetpack_Options;

const FEATURE_NAME = 'mailchimp';
const BLOCK_NAME   = 'jetpack/' . FEATURE_NAME;

/**
 * Registers the block for use in Gutenberg
 * This is done via an action so that we can disable
 * registration if we need to.
 */
function register_block() {
	if (
		( defined( 'IS_WPCOM' ) && IS_WPCOM )
		|| Jetpack::is_active()
	) {
		jetpack_register_block(
			BLOCK_NAME,
			array(
				'render_callback' => __NAMESPACE__ . '\load_assets',
			)
		);
	}
}
add_action( 'init', __NAMESPACE__ . '\register_block' );

/**
 * Mailchimp block registration/dependency declaration.
 *
 * @param array $attr - Array containing the map block attributes.
 *
 * @return string
 */
function load_assets( $attr ) {

	if ( ! verify_connection() ) {
		return null;
	}

	$values  = array();
	$blog_id = ( defined( 'IS_WPCOM' ) && IS_WPCOM )
		? get_current_blog_id()
		: Jetpack_Options::get_option( 'id' );
	Jetpack_Gutenberg::load_assets_as_required( FEATURE_NAME );
	$defaults = array(
		'emailPlaceholder' => esc_html__( 'Enter your email', 'jetpack' ),
		'submitButtonText' => esc_html__( 'Join my email list', 'jetpack' ),
		'consentText'      => esc_html__( 'By clicking submit, you agree to share your email address with the site owner and Mailchimp to receive marketing, updates, and other emails from the site owner. Use the unsubscribe link in those emails to opt out at any time.', 'jetpack' ),
		'processingLabel'  => esc_html__( 'Processing…', 'jetpack' ),
		'successLabel'     => esc_html__( 'Success! You\'re on the list.', 'jetpack' ),
		'errorLabel'       => esc_html__( 'Whoops! There was an error and we couldn\'t process your subscription. Please reload the page and try again.', 'jetpack' ),
		'interests'        => array(),
		'signupFieldTag'   => '',
		'signupFieldValue' => '',
	);
	foreach ( $defaults as $id => $default ) {
		$values[ $id ] = isset( $attr[ $id ] ) ? $attr[ $id ] : $default;
	}

	$values['submitButtonText'] = empty( $values['submitButtonText'] ) ? $defaults['submitButtonText'] : $values['submitButtonText'];

	$classes = Jetpack_Gutenberg::block_classes( FEATURE_NAME, $attr );

	$button_styles = array();
	if ( ! empty( $attr['customBackgroundButtonColor'] ) ) {
		array_push(
			$button_styles,
			sprintf(
				'background-color: %s',
				sanitize_hex_color( $attr['customBackgroundButtonColor'] )
			)
		);
	}
	if ( ! empty( $attr['customTextButtonColor'] ) ) {
		array_push(
			$button_styles,
			sprintf(
				'color: %s',
				sanitize_hex_color( $attr['customTextButtonColor'] )
			)
		);
	}
	$button_styles   = implode( ';', $button_styles );
	$amp_form_action = sprintf( 'https://public-api.wordpress.com/rest/v1.1/sites/%s/email_follow/amp/subscribe/', $blog_id );
	$is_amp_request  = class_exists( 'Jetpack_AMP_Support' ) && Jetpack_AMP_Support::is_amp_request();

	$button_classes = 'components-button is-button is-primary ';
	if ( ! empty( $attr['submitButtonClasses'] ) ) {
		$button_classes .= $attr['submitButtonClasses'];
	}

	ob_start();
	?>

	<div class="<?php echo esc_attr( $classes ); ?>" data-blog-id="<?php echo esc_attr( $blog_id ); ?>">
		<div class="components-placeholder">
			<form
				aria-describedby="wp-block-jetpack-mailchimp_consent-text"
				<?php if ( $is_amp_request ) : ?>
					action-xhr="<?php echo esc_url( $amp_form_action ); ?>"
					method="post"
					id="mailchimp_form"
					target="_top"
					<?php if ( $is_amp_request ) : ?>
					on="submit-success:AMP.setState( { mailing_list_status: 'subscribed', mailing_list_email: event.response.email } )"
					<?php endif; ?>
				<?php endif; ?>
			>
				<p>
					<input
						aria-label="<?php echo esc_attr( $values['emailPlaceholder'] ); ?>"
						placeholder="<?php echo esc_attr( $values['emailPlaceholder'] ); ?>"
						required
						title="<?php echo esc_attr( $values['emailPlaceholder'] ); ?>"
						type="email"
						name="email"
					/>
				</p>
				<?php foreach ( is_array( $values['interests'] ) ? $values['interests'] : array() as $interest ) : ?>
					<input
						name="interests[<?php echo esc_attr( $interest ); ?>]"
						type="hidden"
						class="mc-submit-param"
						value="1"
					/>
				<?php endforeach; ?>
				<?php
				if (
					! empty( $values['signupFieldTag'] )
					&& ! empty( $values['signupFieldValue'] )
					) :
					?>
					<input
						name="merge_fields[<?php echo esc_attr( $values['signupFieldTag'] ); ?>]"
						type="hidden"
						class="mc-submit-param"
						value="<?php echo esc_attr( $values['signupFieldValue'] ); ?>"
					/>
				<?php endif; ?>
				<p>
					<button type="submit" class="<?php echo esc_attr( $button_classes ); ?>" style="<?php echo esc_attr( $button_styles ); ?>">
						<?php echo wp_kses_post( $values['submitButtonText'] ); ?>
					</button>
				</p>
				<p id="wp-block-jetpack-mailchimp_consent-text">
					<?php echo wp_kses_post( $values['consentText'] ); ?>
				</p>

				<?php if ( $is_amp_request ) : ?>

					<div submit-success>
						<template type="amp-mustache">
							<div class="wp-block-jetpack-mailchimp_notification wp-block-jetpack-mailchimp_success wp-block-jetpack-mailchimp__is-amp">
								<?php echo esc_html( $values['successLabel'] ); ?>
							</div>
						</template>
					</div>
					<div submit-error>
						<template type="amp-mustache">
							<div class="wp-block-jetpack-mailchimp_notification wp-block-jetpack-mailchimp_error wp-block-jetpack-mailchimp__is-amp">
								<?php echo esc_html( $values['errorLabel'] ); ?>
							</div>
						</template>
					</div>
					<div submitting>
						<template type="amp-mustache">
							<div class="wp-block-jetpack-mailchimp_notification wp-block-jetpack-mailchimp_processing wp-block-jetpack-mailchimp__is-amp" role="status">
								<?php echo esc_html( $values['processingLabel'] ); ?>
							</div>
						</template>
					</div>

				<?php endif; ?>

			</form>
			<?php if ( ! $is_amp_request ) : ?>

				<div class="wp-block-jetpack-mailchimp_notification wp-block-jetpack-mailchimp_processing" role="status">
					<?php echo esc_html( $values['processingLabel'] ); ?>
				</div>
				<div class="wp-block-jetpack-mailchimp_notification wp-block-jetpack-mailchimp_success" role="status">
					<?php echo esc_html( $values['successLabel'] ); ?>
				</div>
				<div class="wp-block-jetpack-mailchimp_notification wp-block-jetpack-mailchimp_error" role="alert">
					<?php echo esc_html( $values['errorLabel'] ); ?>
				</div>

			<?php endif; ?>
		</div>
	</div>
	<?php
	$html = ob_get_clean();
	return $html;
}

/**
 * Mailchimp connection/list selection verification.
 *
 * @return boolean
 */
function verify_connection() {
	$option = get_option( 'jetpack_mailchimp' );
	if ( ! $option ) {
		return false;
	}
	$data = json_decode( $option, true );
	if ( ! $data ) {
		return false;
	}
	return isset( $data['follower_list_id'], $data['keyring_id'] );
}

• [F] mailchimp.php
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