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/*============LICENSE_START=======================================================
 * oom-truststore-merger
 * ================================================================================
 * Copyright (C) 2020 Nokia. All rights reserved.
 * ================================================================================
 * Licensed 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.oom.certservice.postprocessor.copier;

import java.io.File;
import java.io.IOException;
import java.util.List;
import org.onap.oom.certservice.postprocessor.common.FileTools;
import org.onap.oom.certservice.postprocessor.configuration.model.AppConfiguration;
import org.onap.oom.certservice.postprocessor.copier.exception.KeystoreFileCopyException;
import org.onap.oom.certservice.postprocessor.copier.exception.KeystoreNotExistException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class KeystoreCopier {

    private static final Logger LOGGER = LoggerFactory.getLogger(KeystoreCopier.class);
    private final FileTools fileTools;

    public KeystoreCopier(FileTools fileTools) {
        this.fileTools = fileTools;
    }

    public void copyKeystores(AppConfiguration configuration) {
        final List<String> sources = configuration.getSourceKeystorePaths();
        final List<String> destinations = configuration.getDestinationKeystorePaths();
        containsPaths(sources);
        try {
            for (int i = 0; i < sources.size(); i++) {
                copy(sources.get(i), destinations.get(i));
            }
        } catch (IOException e) {
            throw new KeystoreFileCopyException(e);
        }
    }

    private void containsPaths(List<String> sources) {
        if (sources.isEmpty()) {
            LOGGER.info("No Keystore files to copy");
        }
    }

    private void copy(String sourcePath, String destinationPath) throws IOException {
        final File source = new File(sourcePath);
        final File destination = new File(destinationPath);

        if (!source.exists()) {
            throw new KeystoreNotExistException("Keystore file does not exist '" + source.getAbsolutePath() + "'!");
        }

        if (destination.exists()) {
            fileTools.createBackup(destination);
        }
        fileTools.copy(source, destination);
    }

}