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<?php

namespace WPMailSMTP;

use WPMailSMTP\Reports\Emails\Summary as SummaryReportEmail;
use WPMailSMTP\Tasks\Meta;
use WPMailSMTP\Tasks\Reports\SummaryEmailTask as SummaryReportEmailTask;
use WPMailSMTP\Tasks\Tasks;

/**
 * Class Migration helps migrate plugin options, DB tables and more.
 *
 * @since 1.0.0 Migrate all plugin options saved from separate WP options into one.
 * @since 2.1.0 Major overhaul of this class to use DB migrations (or any other migrations per version).
 * @since 3.0.0 Extends MigrationAbstract.
 */
class Migration extends MigrationAbstract {

/**
	 * Version of the latest migration.
	 *
	 * @since 2.1.0
	 */
	const VERSION = 5;

/**
	 * Option key where we save the current migration version.
	 *
	 * @since 2.1.0
	 */
	const OPTION_NAME = 'wp_mail_smtp_migration_version';

/**
	 * Current migration version, received from static::OPTION_NAME WP option.
	 *
	 * @since 2.1.0
	 *
	 * @var int
	 */
	protected $cur_ver;

/**
	 * All old values for pre 1.0 version of a plugin.
	 *
	 * @since 1.0.0
	 *
	 * @var array
	 */
	protected $old_keys = array(
		'pepipost_ssl',
		'pepipost_port',
		'pepipost_pass',
		'pepipost_user',
		'smtp_pass',
		'smtp_user',
		'smtp_auth',
		'smtp_ssl',
		'smtp_port',
		'smtp_host',
		'mail_set_return_path',
		'mailer',
		'mail_from_name',
		'mail_from',
		'wp_mail_smtp_am_notifications_hidden',
	);

/**
	 * Old values, taken from $old_keys options.
	 *
	 * @since 1.0.0
	 *
	 * @var array
	 */
	protected $old_values = array();

/**
	 * Converted array of data from previous option values.
	 *
	 * @since 1.0.0
	 *
	 * @var array
	 */
	protected $new_values = array();

/**
	 * Initialize migration.
	 *
	 * @since 3.0.0
	 */
	public function init() {

$this->maybe_migrate();
	}

/**
	 * Static on purpose, to get current migration version without __construct() and validation.
	 *
	 * @since 2.1.0
	 *
	 * @return int
	 */
	public static function get_cur_version() {

return (int) get_option( static::OPTION_NAME, 0 );
	}

/**
	 * Run the migration if needed.
	 *
	 * @since 2.1.0
	 */
	protected function maybe_migrate() {

if ( version_compare( $this->cur_ver, static::VERSION, '<' ) ) {
			$this->run( static::VERSION );
		}
	}

/**
	 * Actual migration launcher.
	 *
	 * @since 2.1.0
	 *
	 * @param int $version The version of migration to run.
	 */
	protected function run( $version ) {

$function_version = (int) $version;

if ( method_exists( $this, 'migrate_to_' . $function_version ) ) {
			$this->{'migrate_to_' . $function_version}();
		} else {
			if ( WP::in_wp_admin() ) {
				$message = sprintf( /* translators: %1$s - WP Mail SMTP, %2$s - error message. */
					esc_html__( 'There was an error while upgrading the database. Please contact %1$s support with this information: %2$s.', 'wp-mail-smtp' ),
					'<strong>WP Mail SMTP</strong>',
					'<code>migration from v' . static::get_cur_version() . ' to v' . static::VERSION . ' failed. Plugin version: v' . WPMS_PLUGIN_VER . '</code>'
				);

WP::add_admin_notice( $message, WP::ADMIN_NOTICE_ERROR );
			}
		}
	}

/**
	 * Update migration version in options table.
	 *
	 * @since 2.1.0
	 *
	 * @param int $version Migration version.
	 */
	protected function update_db_ver( $version = 0 ) {

if ( empty( $version ) ) {
			$version = static::VERSION;
		}

// Autoload it, because this value is checked all the time
		// and no need to request it separately from all autoloaded options.
		update_option( static::OPTION_NAME, $version, true );
	}

/**
	 * Prevent running the same migration twice.
	 * Run migration only when required.
	 *
	 * @since 2.1.0
	 *
	 * @param string $version The version of migration to check for potential execution.
	 */
	protected function maybe_required_older_migrations( $version ) {

if ( version_compare( $this->cur_ver, $version, '<' ) ) {
			$this->run( $version );
		}
	}

/**
	 * Migration from 0.x to 1.0.0.
	 * Move separate plugin WP options to one main plugin WP option setting.
	 *
	 * @since 2.1.0
	 */
	private function migrate_to_1() {

if ( $this->is_migrated() ) {
			return;
		}

$this->old_values = $this->get_old_values();
		$this->new_values = $this->get_converted_options();

Options::init()->set( $this->new_values, true );

$this->update_db_ver( 1 );
	}

/**
	 * Migration from 1.x to 2.1.0.
	 * Create Tasks\Meta table, if it does not exist.
	 *
	 * @since 2.1.0
	 */
	private function migrate_to_2() {

$this->maybe_required_older_migrations( 1 );

$meta = new Meta();

// Create the table if it doesn't exist.
		if ( $meta && ! $meta->table_exists() ) {
			$meta->create_table();
		}

$this->update_db_ver( 2 );
	}

/**
	 * Migration to 2.6.0.
	 * Cancel all recurring ActionScheduler tasks, so they will be newly created and no longer
	 * cause PHP fatal error on PHP 8 (because of the named parameter 'tasks_meta_id').
	 *
	 * @since 2.6.0
	 */
	private function migrate_to_3() {

$this->maybe_required_older_migrations( 2 );

$tasks = [];
		$ut    = new UsageTracking\UsageTracking();

if ( $ut->is_enabled() ) {
			$tasks[] = '\WPMailSMTP\UsageTracking\SendUsageTask';
		}

$recurring_tasks = apply_filters( 'wp_mail_smtp_migration_cancel_recurring_tasks', $tasks );

foreach ( $recurring_tasks as $task ) {
			( new $task() )->cancel();
		}

$this->update_db_ver( 3 );
	}

/**
	 * Migration to 3.0.0.
	 * Disable summary report email for Lite users and Multisite installations after update.
	 * For new installations we have default values in Options::get_defaults.
	 *
	 * @since 3.0.0
	 */
	protected function migrate_to_4() {

$this->maybe_required_older_migrations( 3 );

$options = Options::init();

$value = $options->get( 'general', SummaryReportEmail::SETTINGS_SLUG );

// If option was not already set, then plugin was updated from lower version.
		if (
			( $value === '' || $value === null ) &&
			( is_multisite() || ! wp_mail_smtp()->is_pro() )
		) {
			$data = [
				'general' => [
					SummaryReportEmail::SETTINGS_SLUG => true,
				],
			];

$options->set( $data, false, false );

// Just to be safe cancel summary report email task.
			( new SummaryReportEmailTask() )->cancel();
		}

$this->update_db_ver( 4 );
	}

/**
	 * Cleanup scheduled actions meta table.
	 *
	 * @since 3.5.0
	 */
	protected function migrate_to_5() {

$this->maybe_required_older_migrations( 4 );

global $wpdb;

$meta = new Meta();

if (
			$meta->table_exists() &&
			$meta->table_exists( $wpdb->prefix . 'actionscheduler_actions' ) &&
			$meta->table_exists( $wpdb->prefix . 'actionscheduler_groups' )
		) {
			$group = Tasks::GROUP;
			$sql   = "SELECT DISTINCT a.args FROM {$wpdb->prefix}actionscheduler_actions a
					JOIN {$wpdb->prefix}actionscheduler_groups g ON g.group_id = a.group_id
					WHERE g.slug = '$group' AND a.status IN ('pending', 'in-progress')";

// phpcs:disable WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.PreparedSQL.NotPrepared
			$results = $wpdb->get_results( $sql, 'ARRAY_A' );
			// phpcs:enable WordPress.DB.DirectDatabaseQuery.NoCaching, WordPress.DB.PreparedSQL.NotPrepared

$results  = $results ? $results : [];
			$meta_ids = [];

foreach ( $results as $result ) {
				$args = isset( $result['args'] ) ? json_decode( $result['args'], true ) : null;

if ( $args && isset( $args[0] ) && is_numeric( $args[0] ) ) {
					$meta_ids[] = $args[0];
				}
			}

$table  = Meta::get_table_name();
			$not_in = 0;

if ( ! empty( $meta_ids ) ) {
				// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
				$not_in = $wpdb->prepare( implode( ',', array_fill( 0, count( $meta_ids ), '%d' ) ), $meta_ids );
			}

// phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.DirectDatabaseQuery.NoCaching
			$wpdb->query( "DELETE FROM $table WHERE id NOT IN ($not_in)" );
			// phpcs:enable WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.DirectDatabaseQuery.NoCaching
		}

// Save the current version to DB.
		$this->update_db_ver( 5 );
	}

/**
	 * Whether we already migrated or not.
	 *
	 * @since 1.0.0
	 *
	 * @return bool
	 */
	protected function is_migrated() {

$is_migrated = false;
		$new_values  = get_option( Options::META_KEY, array() );

if ( ! empty( $new_values ) ) {
			$is_migrated = true;
		}

return $is_migrated;
	}

/**
	 * Get all old values from DB.
	 *
	 * @since 1.0.0
	 *
	 * @return array
	 */
	protected function get_old_values() {

$old_values = array();

foreach ( $this->old_keys as $old_key ) {
			$value = get_option( $old_key, '' );

if ( ! empty( $value ) ) {
				$old_values[ $old_key ] = $value;
			}
		}

return $old_values;
	}

/**
	 * Convert old values from key=>value to a multidimensional array of data.
	 *
	 * @since 1.0.0
	 */
	protected function get_converted_options() {

$converted = array();

foreach ( $this->old_keys as $old_key ) {

$old_value = isset( $this->old_values[ $old_key ] ) ? $this->old_values[ $old_key ] : '';

switch ( $old_key ) {
				case 'pepipost_user':
				case 'pepipost_pass':
				case 'pepipost_port':
				case 'pepipost_ssl':
					// Do not migrate pepipost options if it's not activated at the moment.
					if ( isset( $this->old_values['mailer'] ) && $this->old_values['mailer'] === 'pepipost' ) {
						$shortcut = explode( '_', $old_key );

if ( $old_key === 'pepipost_ssl' ) {
							$converted[ $shortcut[0] ]['encryption'] = $old_value;
						} else {
							$converted[ $shortcut[0] ][ $shortcut[1] ] = $old_value;
						}
					}
					break;

case 'smtp_host':
				case 'smtp_port':
				case 'smtp_ssl':
				case 'smtp_auth':
				case 'smtp_user':
				case 'smtp_pass':
					$shortcut = explode( '_', $old_key );

if ( $old_key === 'smtp_ssl' ) {
						$converted[ $shortcut[0] ]['encryption'] = $old_value;
					} elseif ( $old_key === 'smtp_auth' ) {
						$converted[ $shortcut[0] ][ $shortcut[1] ] = ( $old_value === 'true' ? 'yes' : 'no' );
					} else {
						$converted[ $shortcut[0] ][ $shortcut[1] ] = $old_value;
					}

break;

case 'mail_from':
					$converted['mail']['from_email'] = $old_value;
					break;
				case 'mail_from_name':
					$converted['mail']['from_name'] = $old_value;
					break;
				case 'mail_set_return_path':
					$converted['mail']['return_path'] = ( $old_value === 'true' );
					break;
				case 'mailer':
					$converted['mail']['mailer'] = ! empty( $old_value ) ? $old_value : 'mail';
					break;
				case 'wp_mail_smtp_am_notifications_hidden':
					$converted['general']['am_notifications_hidden'] = ( isset( $old_value ) && $old_value === 'true' );
					break;
			}
		}

$converted = $this->get_converted_constants_options( $converted );

return $converted;
	}

/**
	 * Some users use constants in wp-config.php to define values.
	 * We need to prioritize them and reapply data to options.
	 * Use only those that are actually defined.
	 *
	 * @since 1.0.0
	 *
	 * @param array $converted
	 *
	 * @return array
	 */
	protected function get_converted_constants_options( $converted ) {

// Are we configured via constants?
		if ( ! defined( 'WPMS_ON' ) || ! WPMS_ON ) {
			return $converted;
		}

/*
		 * Mail settings.
		 */
		if ( defined( 'WPMS_MAIL_FROM' ) ) {
			$converted['mail']['from_email'] = WPMS_MAIL_FROM;
		}
		if ( defined( 'WPMS_MAIL_FROM_NAME' ) ) {
			$converted['mail']['from_name'] = WPMS_MAIL_FROM_NAME;
		}
		if ( defined( 'WPMS_MAILER' ) ) {
			$converted['mail']['mailer'] = WPMS_MAILER;
		}
		if ( defined( 'WPMS_SET_RETURN_PATH' ) ) {
			$converted['mail']['return_path'] = WPMS_SET_RETURN_PATH;
		}

/*
		 * SMTP settings.
		 */
		if ( defined( 'WPMS_SMTP_HOST' ) ) {
			$converted['smtp']['host'] = WPMS_SMTP_HOST;
		}
		if ( defined( 'WPMS_SMTP_PORT' ) ) {
			$converted['smtp']['port'] = WPMS_SMTP_PORT;
		}
		if ( defined( 'WPMS_SSL' ) ) {
			$converted['smtp']['ssl'] = WPMS_SSL;
		}
		if ( defined( 'WPMS_SMTP_AUTH' ) ) {
			$converted['smtp']['auth'] = WPMS_SMTP_AUTH;
		}
		if ( defined( 'WPMS_SMTP_USER' ) ) {
			$converted['smtp']['user'] = WPMS_SMTP_USER;
		}
		if ( defined( 'WPMS_SMTP_PASS' ) ) {
			$converted['smtp']['pass'] = WPMS_SMTP_PASS;
		}

return $converted;
	}

/**
	 * Delete all old values that are stored separately each.
	 *
	 * @since 1.0.0
	 */
	protected function clean_deprecated_data() {

foreach ( $this->old_keys as $old_key ) {
			delete_option( $old_key );
		}
	}
}

Editing: Migration.php

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