com.github.exabrial.checkpgpsignaturesplugin.gpg.GPGKeyRetriever Maven / Gradle / Ivy

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Automatically check PGP signatures on downloaded artifacts using GPG
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/**
 * Copyright [2018] [Jonathan S. Fisher]
 *
 * 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.
 */

package com.github.exabrial.checkpgpsignaturesplugin.gpg;

import java.io.File;
import java.io.IOException;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import org.apache.commons.io.FileUtils;
import org.codehaus.plexus.logging.Logger;
import org.codehaus.plexus.util.cli.Commandline;

import com.github.exabrial.checkpgpsignaturesplugin.interfaces.KeyRetriever;
import com.github.exabrial.checkpgpsignaturesplugin.model.CouldntRetrieveKeyException;
import com.github.exabrial.checkpgpsignaturesplugin.model.PGPKey;

import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;

@Named
@Singleton
@SuppressFBWarnings("RV_RETURN_VALUE_IGNORED_BAD_PRACTICE")
public class GPGKeyRetriever implements KeyRetriever {
	@Inject
	private CommandExecutor commandExecutor;
	@Inject
	private GPGLocator gpgLocator;
	@Inject
	private Logger logger;

	@Override
	public PGPKey retrieveKey(final String keyId) {
		logger.info("retrieveKey() fetching keyId:" + keyId);
		try {
			final File tempKeyFile = createTempFile(keyId);
			try {
				final Commandline cmd = new Commandline();
				cmd.setExecutable(gpgLocator.getGPGExecutable());
				cmd.createArg().setValue("--verbose");
				cmd.createArg().setValue("--recv-keys");
				cmd.createArg().setValue("--no-default-keyring");
				cmd.createArg().setValue("--always-trust");
				cmd.createArg().setValue("--keyserver");
				// TODO make server an option
				cmd.createArg().setValue("hkps.pool.sks-keyservers.net");
				cmd.createArg().setValue("--keyring");
				cmd.createArg().setValue(tempKeyFile.getAbsolutePath());
				cmd.createArg().setValue(keyId);
				final ExecutionResult result = commandExecutor.execute(cmd);
				if (result.exitCode != 0) {
					throw new CouldntRetrieveKeyException(result, keyId);
				} else {
					final byte[] keyBytes = FileUtils.readFileToByteArray(tempKeyFile);
					return new PGPKey(keyId, keyBytes);
				}
			} finally {
				tempKeyFile.delete();
			}
		} catch (final IOException e) {
			throw new CouldntRetrieveKeyException(e);
		}
	}

	File createTempFile(final String keyId) throws IOException {
		final File tempKeyFile = File.createTempFile(keyId, "kbx");
		return tempKeyFile;
	}
}