public void init(String username, Credentials credentials) {
        this.credentials = credentials;
        setIdentifier(username.toLowerCase());
    }
Initializes this AuthenticatedUser using the given username and
credentials.

@param username
    The username of the user that was authenticated.

@param credentials
    The credentials provided when this user was authenticated.
extensions/guacamole-auth-header/src/main/java/org/apache/guacamole/auth/header/user/AuthenticatedUser.java