zookeeper-server/src/main/java/org/apache/zookeeper/server/auth/SaslServerCallbackHandler.java [47:71]:
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    public void handle(Callback[] callbacks) throws UnsupportedCallbackException {
        for (Callback callback : callbacks) {
            if (callback instanceof NameCallback) {
                handleNameCallback((NameCallback) callback);
            } else if (callback instanceof PasswordCallback) {
                handlePasswordCallback((PasswordCallback) callback);
            } else if (callback instanceof RealmCallback) {
                handleRealmCallback((RealmCallback) callback);
            } else if (callback instanceof AuthorizeCallback) {
                handleAuthorizeCallback((AuthorizeCallback) callback);
            }
        }
    }

    private void handleNameCallback(NameCallback nc) {
        // check to see if this user is in the user password database.
        if (credentials.get(nc.getDefaultName()) == null) {
            LOG.warn("User '{}' not found in list of DIGEST-MD5 authenticateable users.", nc.getDefaultName());
            return;
        }
        nc.setName(nc.getDefaultName());
        userName = nc.getDefaultName();
    }

    private void handlePasswordCallback(PasswordCallback pc) {
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zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/auth/SaslQuorumServerCallbackHandler.java [89:113]:
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    public void handle(Callback[] callbacks) throws UnsupportedCallbackException {
        for (Callback callback : callbacks) {
            if (callback instanceof NameCallback) {
                handleNameCallback((NameCallback) callback);
            } else if (callback instanceof PasswordCallback) {
                handlePasswordCallback((PasswordCallback) callback);
            } else if (callback instanceof RealmCallback) {
                handleRealmCallback((RealmCallback) callback);
            } else if (callback instanceof AuthorizeCallback) {
                handleAuthorizeCallback((AuthorizeCallback) callback);
            }
        }
    }

    private void handleNameCallback(NameCallback nc) {
        // check to see if this user is in the user password database.
        if (credentials.get(nc.getDefaultName()) == null) {
            LOG.warn("User '{}' not found in list of DIGEST-MD5 authenticateable users.", nc.getDefaultName());
            return;
        }
        nc.setName(nc.getDefaultName());
        userName = nc.getDefaultName();
    }

    private void handlePasswordCallback(PasswordCallback pc) {
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