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Editing: class-yoast-alerts.php

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<?php
/**
 * WPSEO plugin file.
 *
 * @package WPSEO\Admin\Notifications
 */

/**
 * Class Yoast_Alerts.
 */
class Yoast_Alerts {

/**
	 * Holds the admin page's ID.
	 *
	 * @var string
	 */
	const ADMIN_PAGE = 'wpseo_dashboard';

/**
	 * Total notifications count.
	 *
	 * @var int
	 */
	private static $notification_count = 0;

/**
	 * All error notifications.
	 *
	 * @var array
	 */
	private static $errors = [];

/**
	 * Active errors.
	 *
	 * @var array
	 */
	private static $active_errors = [];

/**
	 * Dismissed errors.
	 *
	 * @var array
	 */
	private static $dismissed_errors = [];

/**
	 * All warning notifications.
	 *
	 * @var array
	 */
	private static $warnings = [];

/**
	 * Active warnings.
	 *
	 * @var array
	 */
	private static $active_warnings = [];

/**
	 * Dismissed warnings.
	 *
	 * @var array
	 */
	private static $dismissed_warnings = [];

/**
	 * Yoast_Alerts constructor.
	 */
	public function __construct() {

$this->add_hooks();
	}

/**
	 * Add hooks
	 */
	private function add_hooks() {

$page = filter_input( INPUT_GET, 'page' );
		if ( self::ADMIN_PAGE === $page ) {
			add_action( 'admin_enqueue_scripts', [ $this, 'enqueue_assets' ] );
		}

// Needed for adminbar and Alerts page.
		add_action( 'admin_init', [ __CLASS__, 'collect_alerts' ], 99 );

// Add AJAX hooks.
		add_action( 'wp_ajax_yoast_dismiss_alert', [ $this, 'ajax_dismiss_alert' ] );
		add_action( 'wp_ajax_yoast_restore_alert', [ $this, 'ajax_restore_alert' ] );
	}

/**
	 * Enqueue assets.
	 */
	public function enqueue_assets() {

$asset_manager = new WPSEO_Admin_Asset_Manager();
		$asset_manager->enqueue_style( 'alerts' );
	}

/**
	 * Handle ajax request to dismiss an alert.
	 */
	public function ajax_dismiss_alert() {

$notification = $this->get_notification_from_ajax_request();
		if ( $notification ) {
			$notification_center = Yoast_Notification_Center::get();
			$notification_center->maybe_dismiss_notification( $notification );

$this->output_ajax_response( $notification->get_type() );
		}

wp_die();
	}

/**
	 * Handle ajax request to restore an alert.
	 */
	public function ajax_restore_alert() {

$this->output_ajax_response( $notification->get_type() );
		}

wp_die();
	}

/**
	 * Create AJAX response data.
	 *
	 * @param string $type Alert type.
	 */
	private function output_ajax_response( $type ) {

$html = $this->get_view_html( $type );
		// phpcs:disable WordPress.Security.EscapeOutput -- Reason: WPSEO_Utils::format_json_encode is safe.
		echo WPSEO_Utils::format_json_encode(
			[
				'html'  => $html,
				'total' => self::get_active_alert_count(),
			]
		);
		// phpcs:enable -- Reason: WPSEO_Utils::format_json_encode is safe.
	}

/**
	 * Get the HTML to return in the AJAX request.
	 *
	 * @param string $type Alert type.
	 *
	 * @return bool|string
	 */
	private function get_view_html( $type ) {

switch ( $type ) {
			case 'error':
				$view = 'errors';
				break;

case 'warning':
			default:
				$view = 'warnings';
				break;
		}

// Re-collect alerts.
		self::collect_alerts();

/**
		 * Stops PHPStorm from nagging about this variable being unused. The variable is used in the view.
		 *
		 * @noinspection PhpUnusedLocalVariableInspection
		 */
		$alerts_data = self::get_template_variables();

ob_start();
		include WPSEO_PATH . 'admin/views/partial-alerts-' . $view . '.php';
		$html = ob_get_clean();

return $html;
	}

/**
	 * Extract the Yoast Notification from the AJAX request.
	 *
	 * @return null|Yoast_Notification
	 */
	private function get_notification_from_ajax_request() {

$notification_center = Yoast_Notification_Center::get();
		$notification_id     = filter_input( INPUT_POST, 'notification' );

return $notification_center->get_notification_by_id( $notification_id );
	}

/**
	 * Show the alerts overview page.
	 */
	public static function show_overview_page() {

include WPSEO_PATH . 'admin/views/alerts-dashboard.php';
	}

/**
	 * Collect the alerts and group them together.
	 */
	public static function collect_alerts() {

$notification_center = Yoast_Notification_Center::get();

$notifications            = $notification_center->get_sorted_notifications();
		self::$notification_count = count( $notifications );

self::$errors           = array_filter( $notifications, [ __CLASS__, 'filter_error_alerts' ] );
		self::$dismissed_errors = array_filter( self::$errors, [ __CLASS__, 'filter_dismissed_alerts' ] );
		self::$active_errors    = array_diff( self::$errors, self::$dismissed_errors );

self::$warnings           = array_filter( $notifications, [ __CLASS__, 'filter_warning_alerts' ] );
		self::$dismissed_warnings = array_filter( self::$warnings, [ __CLASS__, 'filter_dismissed_alerts' ] );
		self::$active_warnings    = array_diff( self::$warnings, self::$dismissed_warnings );
	}

/**
	 * Get the variables needed in the views.
	 *
	 * @return array
	 */
	public static function get_template_variables() {

return [
			'metrics'  => [
				'total'    => self::$notification_count,
				'active'   => self::get_active_alert_count(),
				'errors'   => count( self::$errors ),
				'warnings' => count( self::$warnings ),
			],
			'errors'   => [
				'dismissed' => self::$dismissed_errors,
				'active'    => self::$active_errors,
			],
			'warnings' => [
				'dismissed' => self::$dismissed_warnings,
				'active'    => self::$active_warnings,
			],
		];
	}

/**
	 * Get the number of active alerts.
	 *
	 * @return int
	 */
	public static function get_active_alert_count() {

return ( count( self::$active_errors ) + count( self::$active_warnings ) );
	}

/**
	 * Filter out any non-errors.
	 *
	 * @param Yoast_Notification $notification Notification to test.
	 *
	 * @return bool
	 */
	private static function filter_error_alerts( Yoast_Notification $notification ) {

return $notification->get_type() === 'error';
	}

/**
	 * Filter out any non-warnings.
	 *
	 * @param Yoast_Notification $notification Notification to test.
	 *
	 * @return bool
	 */
	private static function filter_warning_alerts( Yoast_Notification $notification ) {

return $notification->get_type() !== 'error';
	}

/**
	 * Filter out any dismissed notifications.
	 *
	 * @param Yoast_Notification $notification Notification to test.
	 *
	 * @return bool
	 */
	private static function filter_dismissed_alerts( Yoast_Notification $notification ) {

return Yoast_Notification_Center::is_notification_dismissed( $notification );
	}
}

Editing: class-yoast-alerts.php

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