public String getShareKey() {
        return shareKey;
    }
Returns the share key which was provided by this user when they
authenticated. If there is no such share key, null is returned.

@return
    The share key which was provided by this user when they
    authenticated, or null if no share key was provided.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/sharing/user/SharedAuthenticatedUser.java