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Editing: Notifications.php

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<?php

namespace WPMailSMTP\Admin;

use WPMailSMTP\Helpers\Helpers;
use WPMailSMTP\Options;
use WPMailSMTP\WP;

/**
 * Notifications.
 *
 * @since 2.3.0
 */
class Notifications {

/**
	 * Source of notifications content.
	 *
	 * @since 2.3.0
	 *
	 * @var string
	 */
	const SOURCE_URL = 'https://wpmailsmtpapi.com/feeds/v1/notifications';

/**
	 * The WP option key for storing the notification options.
	 *
	 * @since 2.3.0
	 *
	 * @var string
	 */
	const OPTION_KEY = 'wp_mail_smtp_notifications';

/**
	 * Option value.
	 *
	 * @since 2.3.0
	 *
	 * @var bool|array
	 */
	public $option = false;

/**
	 * Initialize class.
	 *
	 * @since 2.3.0
	 */
	public function init() {

$this->hooks();
	}

/**
	 * Register hooks.
	 *
	 * @since 2.3.0
	 */
	public function hooks() {

add_action( 'admin_enqueue_scripts', [ $this, 'enqueue_assets' ] );
		add_action( 'wp_mail_smtp_admin_pages_before_content', [ $this, 'output' ] );
		add_action( 'wp_ajax_wp_mail_smtp_notification_dismiss', [ $this, 'dismiss' ] );
	}

/**
	 * Check if notifications are enabled.
	 *
	 * @since 4.3.0
	 *
	 * @return bool
	 */
	public function is_enabled() {

return ! Options::init()->get( 'general', 'am_notifications_hidden' );
	}

/**
	 * Check if user has access and is enabled.
	 *
	 * @since 2.3.0
	 *
	 * @return bool
	 */
	public function has_access() {

$access = false;

if (
			current_user_can( wp_mail_smtp()->get_capability_manage_options() ) &&
			$this->is_enabled()
		) {
			$access = true;
		}

return apply_filters( 'wp_mail_smtp_admin_notifications_has_access', $access );
	}

/**
	 * Get option value.
	 *
	 * @since 2.3.0
	 *
	 * @param bool $cache Reference property cache if available.
	 *
	 * @return array
	 */
	public function get_option( $cache = true ) {

if ( $this->option && $cache ) {
			return $this->option;
		}

$option = get_option( self::OPTION_KEY, [] );

$this->option = [
			'update'    => ! empty( $option['update'] ) ? $option['update'] : 0,
			'events'    => ! empty( $option['events'] ) ? $option['events'] : [],
			'feed'      => ! empty( $option['feed'] ) ? $option['feed'] : [],
			'dismissed' => ! empty( $option['dismissed'] ) ? $option['dismissed'] : [],
		];

return $this->option;
	}

/**
	 * Fetch notifications from feed.
	 *
	 * @since 2.3.0
	 *
	 * @return array
	 */
	protected function fetch_feed() {

$feed_url = self::SOURCE_URL . '/' . wp_mail_smtp()->get_license_type();

$response = wp_remote_get(
			$feed_url,
			[
				'user-agent' => Helpers::get_default_user_agent(),
			]
		);

if ( is_wp_error( $response ) ) {
			return [];
		}

$body = wp_remote_retrieve_body( $response );

if ( empty( $body ) ) {
			return [];
		}

return $this->verify( json_decode( $body, true ) );
	}

/**
	 * Verify notification data before it is saved.
	 *
	 * @since 2.3.0
	 *
	 * @param array $notifications Array of notification items to verify.
	 *
	 * @return array
	 */
	protected function verify( $notifications ) { // phpcs:ignore Generic.Metrics.CyclomaticComplexity.TooHigh

$data = [];

if ( ! is_array( $notifications ) || empty( $notifications ) ) {
			return $data;
		}

$option = $this->get_option();

foreach ( $notifications as $notification ) {

// The message and license should never be empty, if they are, ignore.
			if ( empty( $notification['content'] ) || empty( $notification['type'] ) ) {
				continue;
			}

// Ignore if license type does not match.
			if ( ! in_array( wp_mail_smtp()->get_license_type(), $notification['type'], true ) ) {
				continue;
			}

// Ignore if expired.
			if ( ! empty( $notification['end'] ) && time() > strtotime( $notification['end'] ) ) {
				continue;
			}

// Ignore if notification has already been dismissed.
			if ( ! empty( $option['dismissed'] ) && in_array( $notification['id'], $option['dismissed'] ) ) { // phpcs:ignore WordPress.PHP.StrictInArray.MissingTrueStrict
				continue;
			}

// Ignore if notification existed before installing WPForms.
			// Prevents bombarding the user with notifications after activation.
			$activated = get_option( 'wp_mail_smtp_activated_time' );

if (
				! empty( $activated ) &&
				! empty( $notification['start'] ) &&
				$activated > strtotime( $notification['start'] )
			) {
				continue;
			}

$data[] = $notification;
		}

return $data;
	}

/**
	 * Verify saved notification data for active notifications.
	 *
	 * @since 2.3.0
	 *
	 * @param array $notifications Array of notification items to verify.
	 *
	 * @return array
	 */
	protected function verify_active( $notifications ) {

if ( ! is_array( $notifications ) || empty( $notifications ) ) {
			return [];
		}

// Remove notifications that are not active.
		foreach ( $notifications as $key => $notification ) {
			if (
				( ! empty( $notification['start'] ) && time() < strtotime( $notification['start'] ) ) ||
				( ! empty( $notification['end'] ) && time() > strtotime( $notification['end'] ) )
			) {
				unset( $notifications[ $key ] );
			}
		}

return $notifications;
	}

/**
	 * Get notification data.
	 *
	 * @since 2.3.0
	 * @since 3.9.0 Make the AS a recurring task.
	 *
	 * @return array
	 */
	public function get() {

if ( ! $this->has_access() ) {
			return [];
		}

$option = $this->get_option();
		$events = ! empty( $option['events'] ) ? $this->verify_active( $option['events'] ) : [];
		$feed   = ! empty( $option['feed'] ) ? $this->verify_active( $option['feed'] ) : [];

return array_merge( $events, $feed );
	}

/**
	 * Get the update notifications interval.
	 *
	 * @since 3.9.0
	 *
	 * @return int
	 */
	public function get_notification_update_task_interval() {

/**
		 * Filters the interval for the notifications update task.
		 *
		 * @since 3.9.0
		 *
		 * @param int $interval The interval in seconds. Default to a day (in seconds).
		 */
		return (int) apply_filters( 'wp_mail_smtp_admin_notifications_get_notification_update_task_interval', DAY_IN_SECONDS );
	}

/**
	 * Get notification count.
	 *
	 * @since 2.3.0
	 *
	 * @return int
	 */
	public function get_count() {

return count( $this->get() );
	}

/**
	 * Add a manual notification event.
	 *
	 * @since 2.3.0
	 *
	 * @param array $notification Notification data.
	 */
	public function add( $notification ) {

if ( empty( $notification['id'] ) ) {
			return;
		}

$option = $this->get_option();

if ( in_array( $notification['id'], $option['dismissed'] ) ) { // phpcs:ignore WordPress.PHP.StrictInArray.MissingTrueStrict
			return;
		}

foreach ( $option['events'] as $item ) {
			if ( $item['id'] === $notification['id'] ) {
				return;
			}
		}

$notification = $this->verify( [ $notification ] );

update_option(
			self::OPTION_KEY,
			[
				'update'    => $option['update'],
				'feed'      => $option['feed'],
				'events'    => array_merge( $notification, $option['events'] ),
				'dismissed' => $option['dismissed'],
			]
		);
	}

/**
	 * Update notification data from feed.
	 *
	 * @since 2.3.0
	 */
	public function update() {

$option = $this->get_option();

// Bail if feed was updated less than an interval ago.
		if ( time() - (int) $option['update'] < $this->get_notification_update_task_interval() ) {
			return;
		}

$feed = $this->fetch_feed();

update_option(
			self::OPTION_KEY,
			[
				'update'    => time(),
				'feed'      => $feed,
				'events'    => $option['events'],
				'dismissed' => $option['dismissed'],
			]
		);
	}

/**
	 * Admin area assets.
	 *
	 * @since 2.3.0
	 *
	 * @param string $hook Hook suffix for the current admin page.
	 */
	public function enqueue_assets( $hook ) {

if ( strpos( $hook, Area::SLUG ) === false ) {
			return;
		}

if ( ! $this->has_access() ) {
			return;
		}

$notifications = $this->get();

if ( empty( $notifications ) ) {
			return;
		}

wp_enqueue_style(
			'wp-mail-smtp-admin-notifications',
			wp_mail_smtp()->assets_url . '/css/admin-notifications.min.css',
			[],
			WPMS_PLUGIN_VER
		);

wp_enqueue_script(
			'wp-mail-smtp-admin-notifications',
			wp_mail_smtp()->assets_url . '/js/smtp-notifications' . WP::asset_min() . '.js',
			[ 'jquery' ],
			WPMS_PLUGIN_VER,
			true
		);
	}

/**
	 * Output notifications.
	 *
	 * @since 2.3.0
	 */
	public function output() { // phpcs:ignore Generic.Metrics.NestingLevel.MaxExceeded

$notifications = $this->get();

if ( empty( $notifications ) ) {
			return;
		}

$notifications_html   = '';
		$current_class        = ' current';
		$content_allowed_tags = [
			'em'     => [],
			'i'      => [],
			'strong' => [],
			'span'   => [
				'style' => [],
			],
			'a'      => [
				'href'   => [],
				'target' => [],
				'rel'    => [],
			],
			'br'     => [],
			'p'      => [
				'id'    => [],
				'class' => [],
			],
		];

foreach ( $notifications as $notification ) {

// Buttons HTML.
			$buttons_html = '';
			if ( ! empty( $notification['btns'] ) && is_array( $notification['btns'] ) ) {
				foreach ( $notification['btns'] as $btn_type => $btn ) {
					if ( empty( $btn['text'] ) ) {
						continue;
					}
					$buttons_html .= sprintf(
						'<a href="%1$s" class="button button-%2$s"%3$s>%4$s</a>',
						! empty( $btn['url'] ) ? esc_url( $btn['url'] ) : '',
						$btn_type === 'main' ? 'primary' : 'secondary',
						! empty( $btn['target'] ) && $btn['target'] === '_blank' ? ' target="_blank" rel="noopener noreferrer"' : '',
						sanitize_text_field( $btn['text'] )
					);
				}
				$buttons_html = ! empty( $buttons_html ) ? '<div class="wp-mail-smtp-notifications-buttons">' . $buttons_html . '</div>' : '';
			}

// Notification HTML.
			$notifications_html .= sprintf(
				'<div class="wp-mail-smtp-notifications-message%5$s" data-message-id="%4$s">
					<h3 class="wp-mail-smtp-notifications-title">%1$s</h3>
					<div class="wp-mail-smtp-notifications-content">%2$s</div>
					%3$s
				</div>',
				! empty( $notification['title'] ) ? sanitize_text_field( $notification['title'] ) : '',
				! empty( $notification['content'] ) ? wp_kses( wpautop( $notification['content'] ), $content_allowed_tags ) : '',
				$buttons_html,
				! empty( $notification['id'] ) ? esc_attr( sanitize_text_field( $notification['id'] ) ) : 0,
				$current_class
			);

// Only first notification is current.
			$current_class = '';
		}
		?>

<?php if ( count( $notifications ) > 1 ) : ?>
					<div class="navigation">
						<a class="prev">
							<span class="screen-reader-text"><?php esc_attr_e( 'Previous message', 'wp-mail-smtp' ); ?></span>
							<span aria-hidden="true">‹</span>
						</a>
						<a class="next">
							<span class="screen-reader-text"><?php esc_attr_e( 'Next message', 'wp-mail-smtp' ); ?>"></span>
							<span aria-hidden="true">›</span>
						</a>
					</div>
				<?php endif; ?>

<div class="wp-mail-smtp-notifications-messages">
					<?php echo $notifications_html; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?>
				</div>
			</div>
		</div>
		<?php
	}

/**
	 * Dismiss notification via AJAX.
	 *
	 * @since 2.3.0
	 */
	public function dismiss() {

// Run a security check.
		check_ajax_referer( 'wp-mail-smtp-admin', 'nonce' );

// Check for access and required param.
		if ( ! current_user_can( wp_mail_smtp()->get_capability_manage_options() ) || empty( $_POST['id'] ) ) {
			wp_send_json_error();
		}

$id     = sanitize_text_field( wp_unslash( $_POST['id'] ) );
		$option = $this->get_option();
		$type   = is_numeric( $id ) ? 'feed' : 'events';

$option['dismissed'][] = $id;
		$option['dismissed']   = array_unique( $option['dismissed'] );

// Remove notification.
		if ( is_array( $option[ $type ] ) && ! empty( $option[ $type ] ) ) {
			foreach ( $option[ $type ] as $key => $notification ) {
				if ( $notification['id'] == $id ) { // phpcs:ignore WordPress.PHP.StrictComparisons
					unset( $option[ $type ][ $key ] );
					break;
				}
			}
		}

update_option( self::OPTION_KEY, $option );

wp_send_json_success();
	}
}

Editing: Notifications.php

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