com.googlecode.download.maven.plugin.internal.SignatureUtils Maven / Gradle / Ivy

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This is a plugin meant to help maven user to download different files on different protocol in part of maven build. For the first implementation, there will only be a goal that will help downloading a maven artifact from the command line. Future version of the plugin could include web download, ftp download, scp download and so on.

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/**
 * Copyright 2012, Red Hat Inc
 *
 * 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.googlecode.download.maven.plugin.internal;

import org.apache.commons.codec.binary.Hex;
import org.apache.maven.plugin.MojoFailureException;

import java.io.*;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 *
 * @author Mickael Istria (Red Hat Inc)
 *
 */
public class SignatureUtils {

	static void verifySignature(File file, String expectedDigest, MessageDigest digest) throws Exception {
		String actualDigestHex = SignatureUtils.computeSignatureAsString(file, digest);
		if (!actualDigestHex.equals(expectedDigest)) {
			throw new MojoFailureException("Not same digest as expected: expected <" + expectedDigest + "> was <"	+ actualDigestHex + ">");
		}
	}

	static String computeSignatureAsString(File file,
			MessageDigest digest) throws IOException {
		InputStream fis = new FileInputStream(file);
		byte[] buffer = new byte[1024];
		int numRead;
		do {
			numRead = fis.read(buffer);
			if (numRead > 0) {
				digest.update(buffer, 0, numRead);
			}
		} while (numRead != -1);
		fis.close();
		byte[] actualDigest = digest.digest();
        return new String(Hex.encodeHex(actualDigest));
	}

	static String getMD5(File file) throws IOException, NoSuchAlgorithmException {
		return computeSignatureAsString(file, MessageDigest.getInstance("MD5"));
	}

	static String getSHA1(File file) throws IOException, NoSuchAlgorithmException {
		return computeSignatureAsString(file, MessageDigest.getInstance("SHA1"));
	}

	static String getSHA512(File file) throws IOException, NoSuchAlgorithmException {
		return computeSignatureAsString(file, MessageDigest.getInstance("SHA-512"));
	}
}