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<?php
/**
* The7 critical alerts class.
*
* @package The7
*/
defined( 'ABSPATH' ) || exit;
/**
* Class The7_Critical_Alerts
*/
class The7_Critical_Alerts {
const PROCESSED_ALERTS_DB_KEY = 'the7_processed_critical_alerts';
const SPAWN_ALERT_CRON_EVENT = 'the7_spawn_critical_alter';
const CHECK_FOR_CRITICAL_ALERTS_EVENT = 'the7_check_for_critical_alerts';
/**
* The7 remote API object.
*
* @var The7_Remote_API
*/
protected $the7_remote_api;
/**
* Email address to send alert to.
*
* @var string
*/
protected $email;
/**
* The7_Critical_Alerts constructor.
*
* @param string $email Email address to send alert to.
* @param The7_Remote_API $the7_remote_api The7 remote API object.
*/
public function __construct( $email, The7_Remote_API $the7_remote_api ) {
$this->email = sanitize_email( $email );
$this->the7_remote_api = $the7_remote_api;
}
/**
* Check if alert is already sent.
*
* @param The7_Critical_Alert $critical_alert Alert object.
*
* @return bool
*/
public static function is_alert_already_sent( The7_Critical_Alert $critical_alert ) {
$processed_alerts = (array) get_option( self::PROCESSED_ALERTS_DB_KEY, array() );
return in_array( $critical_alert->get_time(), $processed_alerts, true );
}
/**
* Mark alert as sent, preventing multiple spawn of the same alert.
*
* @param The7_Critical_Alert $critical_alert Alert object.
*/
public static function alert_was_sent( The7_Critical_Alert $critical_alert ) {
$processed_alerts = (array) get_option( self::PROCESSED_ALERTS_DB_KEY, array() );
$processed_alerts[] = $critical_alert->get_time();
update_option( self::PROCESSED_ALERTS_DB_KEY, array_unique( $processed_alerts ) );
}
/**
* Clear alerts list that was already sent, remove from schedule future alerts.
*/
public static function drop_alerts() {
delete_option( self::PROCESSED_ALERTS_DB_KEY );
wp_unschedule_hook( self::SPAWN_ALERT_CRON_EVENT );
}
/**
* Action. Remove scheduled actions, cleanup db. Triggered on `the7_dashboard_before_settings_save`.
*
* @param array $new_settings New the7 dashboard settings.
* @param array $old_settings Old the7 dashboard settings.
*/
public function maybe_erase_presence( $new_settings, $old_settings ) {
if ( ! isset( $new_settings['critical-alerts'], $old_settings['critical-alerts'] ) ) {
return;
}
if ( $new_settings['critical-alerts'] !== $old_settings['critical-alerts'] && wp_next_scheduled( self::CHECK_FOR_CRITICAL_ALERTS_EVENT ) ) {
wp_unschedule_hook( self::CHECK_FOR_CRITICAL_ALERTS_EVENT );
self::drop_alerts();
}
}
/**
* Add all necessary hooks and schedule critical alert check twice a day.
*/
public function init() {
add_action( self::SPAWN_ALERT_CRON_EVENT, array( $this, 'spawn_critical_alert' ) );
add_action( self::CHECK_FOR_CRITICAL_ALERTS_EVENT, array( $this, 'check_for_critical_alerts' ) );
add_action( 'the7_dashboard_before_settings_save', array( $this, 'maybe_erase_presence' ), 10, 2 );
if ( ! wp_next_scheduled( self::CHECK_FOR_CRITICAL_ALERTS_EVENT ) ) {
wp_schedule_event( time(), 'twicedaily', self::CHECK_FOR_CRITICAL_ALERTS_EVENT );
}
}
/**
* Cron action to check for next critical alert and schedule one if it's haven't been already sent.
*
* @return bool
*/
public function check_for_critical_alerts() {
$critical_alert = $this->remote_get_critical_alert();
if ( ! $critical_alert ) {
return false;
}
return ! self::is_alert_already_sent( $critical_alert ) && $this->schedule_critical_alert( $critical_alert );
}
/**
* Schedule next critical alert.
*
* @param The7_Critical_Alert $critical_alert Alert object.
*
* @return bool
*/
public function schedule_critical_alert( The7_Critical_Alert $critical_alert ) {
$alert_args = array( $critical_alert );
if ( ! wp_next_scheduled( self::SPAWN_ALERT_CRON_EVENT, $alert_args ) ) {
return wp_schedule_single_event( $critical_alert->get_time(), self::SPAWN_ALERT_CRON_EVENT, $alert_args );
}
return false;
}
/**
* Get critical alert data from remote server and return The7_Critical_Alert object on success or false on failure.
*
* @return bool|The7_Critical_Alert
*/
public function remote_get_critical_alert() {
$alert = $this->the7_remote_api->get_critical_alert();
if ( is_wp_error( $alert ) ) {
return false;
}
if ( ! isset( $alert['time'], $alert['subject'], $alert['body'] ) ) {
return false;
}
return new The7_Critical_Alert( $alert['time'], $alert['subject'], $alert['body'] );
}
/**
* Cron action to send an email.
*
* @param The7_Critical_Alert $alert Alert object.
*/
public function spawn_critical_alert( The7_Critical_Alert $alert ) {
if ( $this->send_mail( $this->email, $alert->get_subject(), $alert->get_message() ) ) {
self::alert_was_sent( $alert );
}
}
/**
* Send an email.
*
* @param string $email Email address to send alert to.
* @param string $subject Email subject.
* @param string $message Email message.
*
* @return bool
*/
public function send_mail( $email, $subject, $message ) {
$blogname = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );
$subject = sprintf( '[%s] %s', $blogname, $subject );
$message = str_replace(
[ '###SITEURL###', '###SITENAME###' ],
[ home_url( '/' ), $blogname ],
$message
);
return the7_mail( $email, esc_html( $subject ), wp_kses_post( $message ) );
}
}