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<?php
/**
* Uninstall routine for the Airstory plugin.
*
* Upon removing the plugin, all related user meta should be cleaned up, but *post* meta should be
* left intact.
*
* @package Airstory
*/
namespace Airstory\Uninstall;
use Airstory\Connection as Connection;
require_once __DIR__ . '/includes/class-api.php';
require_once __DIR__ . '/includes/connection.php';
require_once __DIR__ . '/includes/credentials.php';
require_once __DIR__ . '/includes/settings.php';
/**
* Retrieve the IDs of any sites with active Airstory connections.
*
* @global $wpdb
*
* @return array An array of WordPress site IDs that have one or more active Airstory connections.
*/
function get_active_site_ids() {
global $wpdb;
/*
* The SQL query attempts to parse a site ID out of the key name within wp_usermeta.
*
* Assuming the default WordPress $table_prefix (as set in wp-config.php) of "wp_", keys will
* look like:
*
* - wp__airstory_target
* - wp_2__airstory_target
* - wp_3__airstory_target
*
* The SUBSTRING() function within MySQL accepts three arguments: the string, the starting point
* (starting at 0), and the length of the string to return.
*
* The meta_key will be our string, and the length of $table_prefix (available via the
* $wpdb->base_prefix property) + 1 gives us a starting point (e.g. everything before the first
* digit of the site ID).
*
* The third argument is where things get more complicated: we need the length of the meta_key,
* less the length of the static portion ("_airstory_target"), the length of the table prefix,
* and one more (for the extra underscore immediately following the site ID).
*/
// phpcs:disable WordPress.DB.PreparedSQLPlaceholders.LikeWildcardsInQuery
$site_ids = $wpdb->get_col(
$wpdb->prepare(
"
SELECT DISTINCT SUBSTRING(
meta_key,
LENGTH(%s) + 1,
LENGTH(meta_key) - LENGTH('_airstory_target') - LENGTH(%s) - 1
) AS site_id
FROM $wpdb->usermeta WHERE meta_key LIKE '%_airstory_target'
ORDER BY site_id;", $wpdb->base_prefix, $wpdb->base_prefix
)
);
$site_ids = array_map( 'intval', $site_ids );
// phpcs:enable WordPress.DB.PreparedSQLPlaceholders.LikeWildcardsInQuery
return array_values( array_filter( $site_ids ) );
}
/**
* Collect any users that are connected to Airstory and close their connections.
*
* @global $wpdb
*/
function disconnect_all_users() {
global $wpdb;
$user_args = array(
'fields' => 'ID',
'number' => 100,
'count_total' => false,
'meta_query' => array(
array(
'key' => $wpdb->prefix . '_airstory_target',
'compare' => 'EXISTS',
),
),
);
$connected_users = new \WP_User_Query( $user_args );
$user_ids = $connected_users->results;
while ( ! empty( $user_ids ) ) {
$user_id = array_shift( $user_ids );
Connection\remove_connection( $user_id );
// If we've reached the end, get the next batch.
if ( empty( $user_ids ) ) {
$connected_users = new \WP_User_Query( $user_args );
$user_ids = $connected_users->results;
}
}
}
/**
* Delete all _airstory_data usermeta keys from the database.
*
* @global $wpdb
*/
function delete_airstory_data() {
global $wpdb;
$wpdb->query( "DELETE FROM $wpdb->usermeta WHERE meta_key = '_airstory_data';" ); // WPCS: unprepared SQL ok.
// Remove the _airstory_encryption_algorithm site option.
delete_site_option( '_airstory_cipher_algorithm' );
}
// Prevent this file from being executed outside of the plugin uninstallation.
if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) || ! WP_UNINSTALL_PLUGIN ) {
return;
}
/**
* If we're in multisite, ensure we're working on the main site.
*
* Note that is_main_site() will always return true if we're not in a multisite environment.
*/
$is_switched = false;
if ( ! is_main_site() ) {
switch_to_blog( get_network()->site_id );
$is_switched = true;
}
// Clear out users on the main site.
disconnect_all_users();
// Switch back if we weren't on the main site before.
if ( $is_switched ) {
restore_current_blog();
}
// Determine if there are other sites that need clearing.
$active_blogs = get_active_site_ids();
if ( ! empty( $active_blogs ) ) {
foreach ( $active_blogs as $blog_id ) {
switch_to_blog( $blog_id );
disconnect_all_users();
restore_current_blog();
}
}
// Finally, clear out profile data.
delete_airstory_data();