LLMS_Prevent_Concurrent_Logins

LLMS_Prevent_Concurrent_Logins class.

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File: includes/class-llms-prevent-concurrent-logins.php

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class LLMS_Prevent_Concurrent_Logins {
 
    use LLMS_Trait_Singleton;
 
    /**
     * Array of sessions for the current user.
     *
     * @var array
     */
    private $user_sessions;
 
    /**
     * Current user ID.
     *
     * @var int
     */
    private $user_id;
 
    /**
     * Private Constructor.
     *
     * @since 5.6.0
     *
     * @return void
     */
    private function __construct() {
 
        if ( llms_parse_bool( get_option( 'lifterlms_prevent_concurrent_logins', 'no' ) ) &&
                ! empty( get_option( 'lifterlms_prevent_concurrent_logins_roles', array( 'student' ) ) ) ) {
 
            add_action( 'init', array( $this, 'init' ) );
            add_action( 'init', array( $this, 'maybe_prevent_concurrent_logins' ) );
        }
 
    }
 
    /**
     * Initialize.
     *
     * @since 5.6.0
     *
     * @return void
     */
    public function init() {
 
        $this->user_id = get_current_user_id();
 
        if ( empty( $this->user_id ) ) {
            return;
        }
 
        $this->user_sessions = wp_get_all_sessions();
 
    }
 
    /**
     * Maybe prevent current logins.
     *
     * @since 5.6.0
     *
     * @return bool `true` if concurrent login prevented, `false` otherwise.
     */
    public function maybe_prevent_concurrent_logins() {
 
        // No logged in user or current user has only one active session: nothing to do.
        if ( empty( $this->user_sessions ) || count( $this->user_sessions ) < 2 ) {
            return false;
        }
 
        /**
         * Filters whether or not allowing a specific user to have concurrent sessions.
         *
         * @since 5.6.0
         *
         * @param bool $allow   Whether or not the user should be allowed to have concurrent sessions.
         * @param int  $user_id WP_User ID of the current use.
         */
        if ( (bool) apply_filters( 'llms_allow_user_concurrent_logins', false, $this->user_id ) ) {
            return false;
        }
 
        // Current user doesn't have any restricted role: nothing to do.
        if ( empty( array_intersect( get_userdata( $this->user_id )->roles, (array) get_option( 'lifterlms_prevent_concurrent_logins_roles', array( 'student' ) ) ) ) ) {
            return false;
        }
 
        $this->destroy_all_sessions_but_newest();
 
        return true;
 
    }
 
    /**
     * Prevent login by destroying all the user's sessions but the newest.
     *
     * @since 5.6.0
     *
     * @return int 1 if the kept session is the current one, 0 otherwise.
     */
    private function destroy_all_sessions_but_newest() {
 
        $is_current_session_newest_session = $this->current_user_newest_session_login_time() === $this->current_user_current_session_login_time();
 
        $is_current_session_newest_session
            ?
            wp_destroy_other_sessions()
            :
            wp_destroy_current_session();
 
        return (int) $is_current_session_newest_session;
 
    }
 
    /**
     * Retrieve current session for the current user.
     *
     * @since 5.6.0
     *
     * @return int
     */
    private function current_user_current_session_login_time() {
 
        $sessions = WP_Session_Tokens::get_instance( $this->user_id );
        return $sessions->get( wp_get_session_token() )['login'];
 
    }
 
    /**
     * Retrieve newest session login time for the current user.
     *
     * The bigger the login time is the newest the session is.
     *
     * @since 5.6.0
     *
     * @return int
     */
    private function current_user_newest_session_login_time() {
 
        return max( array_column( $this->user_sessions, 'login' ) );
 
    }
 
}

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Version Description
5.6.0 Introduced.

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