/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.rest.messages;

import org.apache.flink.configuration.Configuration;
import org.apache.flink.configuration.GlobalConfiguration;
import org.apache.flink.runtime.rest.handler.cluster.ClusterConfigHandler;

import java.util.ArrayList;

/**
 * Response of the {@link ClusterConfigHandler}, represented as a list
 * of key-value pairs of the cluster {@link Configuration}.
 */
public class ClusterConfigurationInfo extends ArrayList<ClusterConfigurationInfoEntry> implements ResponseBody {

	private static final long serialVersionUID = -1170348873871206964L;

	// a default constructor is required for collection type marshalling
	public ClusterConfigurationInfo() {}

	public ClusterConfigurationInfo(int initialEntries) {
		super(initialEntries);
	}

	public static ClusterConfigurationInfo from(Configuration config) {
		ClusterConfigurationInfo clusterConfig = new ClusterConfigurationInfo(config.keySet().size());

		for (String key : config.keySet()) {
			String value = config.getString(key, null);

			// Mask key values which contain sensitive information
			if (value != null && GlobalConfiguration.isSensitive(key)) {
				value = GlobalConfiguration.HIDDEN_CONTENT;
			}

			clusterConfig.add(new ClusterConfigurationInfoEntry(key, value));
		}

		return clusterConfig;
	}

}

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.rest.messages;

import org.apache.flink.configuration.Configuration;
import org.apache.flink.configuration.ConfigurationUtils;
import org.apache.flink.runtime.rest.handler.cluster.ClusterConfigHandler;

import java.util.ArrayList;
import java.util.Map;

/**
 * Response of the {@link ClusterConfigHandler}, represented as a list
 * of key-value pairs of the cluster {@link Configuration}.
 */
public class ClusterConfigurationInfo extends ArrayList<ClusterConfigurationInfoEntry> implements ResponseBody {

	private static final long serialVersionUID = -1170348873871206964L;

	// a default constructor is required for collection type marshalling
	public ClusterConfigurationInfo() {}

	public ClusterConfigurationInfo(int initialEntries) {
		super(initialEntries);
	}

	public static ClusterConfigurationInfo from(Configuration config) {
		final ClusterConfigurationInfo clusterConfig = new ClusterConfigurationInfo(config.keySet().size());
		final Map<String, String> configurationWithHiddenSensitiveValues = ConfigurationUtils.hideSensitiveValues(config.toMap());

		for (Map.Entry<String, String> keyValuePair : configurationWithHiddenSensitiveValues.entrySet()) {
			clusterConfig.add(new ClusterConfigurationInfoEntry(keyValuePair.getKey(), keyValuePair.getValue()));
		}

		return clusterConfig;
	}

}

Use ConfigurationUtils.hideSensitiveValues in ClusterConfigurationInfo