org.apache.gobblin.runtime.crypto.DecryptCli.java Source code

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Here is the source code for org.apache.gobblin.runtime.crypto.DecryptCli.java

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/*
 * 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.gobblin.runtime.crypto;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Map;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.DefaultParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.commons.io.IOUtils;

import com.google.common.collect.ImmutableMap;

import org.apache.gobblin.annotation.Alias;
import org.apache.gobblin.crypto.EncryptionConfigParser;
import org.apache.gobblin.crypto.EncryptionFactory;
import org.apache.gobblin.runtime.cli.CliApplication;

@Alias(value = "decrypt", description = "Decryption utilities")
public class DecryptCli implements CliApplication {
    private static final Option KEYSTORE_LOCATION = Option.builder("k").longOpt("ks_location").hasArg().required()
            .desc("Keystore location").build();
    private static final Option INPUT_LOCATION = Option.builder("i").longOpt("in").hasArg().required()
            .desc("File to be decrypted").build();
    private static final Option OUTPUT_LOCATION = Option.builder("o").longOpt("out").hasArg().required()
            .desc("Output file (stdin if not specified)").build();

    @Override
    public void run(String[] args) {
        try {
            Options options = new Options();
            options.addOption(KEYSTORE_LOCATION);
            options.addOption(INPUT_LOCATION);
            options.addOption(OUTPUT_LOCATION);

            CommandLine cli;
            try {
                CommandLineParser parser = new DefaultParser();
                cli = parser.parse(options, Arrays.copyOfRange(args, 1, args.length));
            } catch (ParseException pe) {
                System.out.println("Command line parse exception: " + pe.getMessage());
                printUsage(options);
                return;
            }

            Map<String, Object> encryptionProperties = ImmutableMap.<String, Object>of(
                    EncryptionConfigParser.ENCRYPTION_ALGORITHM_KEY, "aes_rotating",
                    EncryptionConfigParser.ENCRYPTION_KEYSTORE_PATH_KEY,
                    cli.getOptionValue(KEYSTORE_LOCATION.getOpt()),
                    EncryptionConfigParser.ENCRYPTION_KEYSTORE_PASSWORD_KEY, getPasswordFromConsole());

            InputStream fIs = new BufferedInputStream(
                    new FileInputStream(new File(cli.getOptionValue(INPUT_LOCATION.getOpt()))));
            InputStream cipherStream = EncryptionFactory.buildStreamCryptoProvider(encryptionProperties)
                    .decodeInputStream(fIs);

            OutputStream out = new BufferedOutputStream(
                    new FileOutputStream(cli.getOptionValue(OUTPUT_LOCATION.getOpt())));

            long bytes = IOUtils.copyLarge(cipherStream, out);
            out.flush();
            out.close();
            System.out.println("Copied " + String.valueOf(bytes) + " bytes.");
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    private void printUsage(Options options) {

        HelpFormatter formatter = new HelpFormatter();

        String usage = "decryption utilities ";
        formatter.printHelp(usage, options);
    }

    private static String getPasswordFromConsole() {
        System.out.print("Please enter the keystore password: ");
        return new String(System.console().readPassword());
    }
}