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Edit File: DomainChecker.php

<?php

namespace WPMailSMTP\Admin;

use WPMailSMTP\Helpers\Helpers;

/**
 * Class for interacting with the Domain Checker API.
 *
 * @since 2.6.0
 */
class DomainChecker {

/**
	 * The domain checker API endpoint.
	 *
	 * @since 2.6.0
	 */
	const ENDPOINT = 'https://connect.wpmailsmtp.com/domain-check/';

/**
	 * The API results.
	 *
	 * @since 2.6.0
	 *
	 * @var array
	 */
	private $results;

/**
	 * The plugin mailer slug.
	 *
	 * @since 2.7.0
	 *
	 * @var string
	 */
	protected $mailer;

/**
	 * Verify the domain for the provided mailer and email address and save the API results.
	 *
	 * @since 2.6.0
	 *
	 * @param string $mailer         The plugin mailer.
	 * @param string $email          The email address from which the domain will be extracted.
	 * @param string $sending_domain The optional sending domain to check the domain records for.
	 */
	public function __construct( $mailer, $email, $sending_domain = '' ) {

$this->mailer = $mailer;

$params = [
			'mailer' => $mailer,
			'email'  => base64_encode( $email ), // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode
			'domain' => $sending_domain,
		];

$response = wp_remote_get(
			add_query_arg( $params, self::ENDPOINT ),
			[
				'user-agent' => Helpers::get_default_user_agent(),
			]
		);

if ( is_wp_error( $response ) ) {
			$this->results = [
				'success' => false,
				'message' => method_exists( $response, 'get_error_message' ) ?
					$response->get_error_message() :
					esc_html__( 'Something went wrong. Please try again later.', 'wp-mail-smtp' ),
				'checks'  => [],
			];
		} else {
			$this->results = json_decode( wp_remote_retrieve_body( $response ), true );
		}
	}

/**
	 * Simple getter for the API results.
	 *
	 * @since 2.6.0
	 *
	 * @return array
	 */
	public function get_results() {
		return $this->results;
	}

/**
	 * Check if the domain checker has found any errors.
	 *
	 * @since 2.6.0
	 *
	 * @return bool
	 */
	public function has_errors() {

if ( empty( $this->results['success'] ) ) {
			return true;
		}

if ( empty( $this->results['checks'] ) ) {
			return false;
		}

$has_error = false;

foreach ( $this->results['checks'] as $check ) {
			if ( $check['state'] === 'error' ) {
				$has_error = true;
				break;
			}
		}

return $has_error;
	}

/**
	 * Check if the domain checker has not found any errors or warnings.
	 *
	 * @since 2.6.0
	 *
	 * @return bool
	 */
	public function no_issues() {

if ( empty( $this->results['success'] ) ) {
			return false;
		}

$no_issues = true;

foreach ( $this->results['checks'] as $check ) {
			if ( in_array( $check['state'], [ 'error', 'warning' ], true ) ) {
				$no_issues = false;
				break;
			}
		}

return $no_issues;
	}

/**
	 * Check if the domain checker support mailer.
	 *
	 * @since 2.7.0
	 *
	 * @return bool
	 */
	public function is_supported_mailer() {

return ! in_array( $this->mailer, [ 'mail', 'pepipostapi' ], true );
	}

/**
	 * Get the domain checker results html.
	 *
	 * @since 2.8.0
	 *
	 * @return string
	 */
	public function get_results_html() {

$results      = $this->get_results();
		$allowed_html = [
			'b' => [],
			'i' => [],
			'a' => [
				'href'   => [],
				'target' => [],
				'rel'    => [],
			],
		];

ob_start();
		?>
		<div id="wp-mail-smtp-domain-check-details">
			<h2><?php esc_html_e( 'Domain Check Results', 'wp-mail-smtp' ); ?></h2>

<?php if ( empty( $results['success'] ) ) : ?>
				<div class="notice-inline <?php echo $this->is_supported_mailer() ? 'notice-error' : 'notice-warning'; ?>">
					<p><?php echo wp_kses( $results['message'], $allowed_html ); ?></p>
				</div>
			<?php endif; ?>

<?php if ( ! empty( $results['checks'] ) ) : ?>
				<div class="wp-mail-smtp-domain-check-details-check-list">
					<?php foreach ( $results['checks'] as $check ) : ?>
						<div class="wp-mail-smtp-domain-check-details-check-list-item">
							<img src="<?php echo esc_url( wp_mail_smtp()->assets_url . '/images/icons/' . esc_attr( $check['state'] ) . '.svg' ); ?>" class="wp-mail-smtp-domain-check-details-check-list-item-icon" alt="<?php printf( /* translators: %s - item state name. */ esc_attr__( '%s icon', 'wp-mail-smtp' ), esc_attr( $check['state'] ) ); ?>">
							<div class="wp-mail-smtp-domain-check-details-check-list-item-content">
								<h3><?php echo esc_html( $check['type'] ); ?></h3>
								<p><?php echo wp_kses( $check['message'], $allowed_html ); ?></p>
							</div>
						</div>
					<?php endforeach; ?>
				</div>
			<?php endif; ?>
		</div>
		<?php
		return ob_get_clean();
	}
}