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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.commons.codec.cli;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.security.MessageDigest;
import java.util.Arrays;
import java.util.Locale;

import org.apache.commons.codec.binary.Hex;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.codec.digest.MessageDigestAlgorithms;

/**
 * A minimal command line to run digest over files, directories or a string
 *
 * @see #main(String[])
 * @since 1.11
 */
public class Digest {

    /**
     * Runs the digest algorithm in {@code args[0]} on the file in {@code args[1]}. If there is no {@code args[1]}, use
     * standard input.
     *
     * 

* The algorithm can also be {@code ALL} or {@code *} to output one line for each known algorithm. *

* * @param args * {@code args[0]} is one of {@link MessageDigestAlgorithms} name, * {@link MessageDigest} name, {@code ALL}, or {@code *}. * {@code args[1+]} is a FILE/DIRECTORY/String. * @throws IOException if an error occurs */ public static void main(final String[] args) throws IOException { new Digest(args).run(); } private final String algorithm; private final String[] args; private final String[] inputs; private Digest(final String[] args) { if (args == null) { throw new IllegalArgumentException("args"); } if (args.length == 0) { throw new IllegalArgumentException( String.format("Usage: java %s [algorithm] [FILE|DIRECTORY|string] ...", Digest.class.getName())); } this.args = args; algorithm = args[0]; if (args.length <= 1) { inputs = null; } else { inputs = new String[args.length -1]; System.arraycopy(args, 1, inputs, 0, inputs.length); } } private void println(final String prefix, final byte[] digest) { println(prefix, digest, null); } private void println(final String prefix, final byte[] digest, final String fileName) { // The standard appears to be to print // hex, space, then either space or '*' followed by file name // where '*' is used for binary files // shasum(1) has a -b option which generates " *" separator // we don't distinguish binary files at present System.out.println(prefix + Hex.encodeHexString(digest) + (fileName != null ? " " + fileName : "")); } private void run() throws IOException { if (algorithm.equalsIgnoreCase("ALL") || algorithm.equals("*")) { run(MessageDigestAlgorithms.values()); return; } final MessageDigest messageDigest = DigestUtils.getDigest(algorithm, null); if (messageDigest != null) { run("", messageDigest); } else { run("", DigestUtils.getDigest(algorithm.toUpperCase(Locale.ROOT))); } } private void run(final String[] digestAlgorithms) throws IOException { for (final String messageDigestAlgorithm : digestAlgorithms) { if (DigestUtils.isAvailable(messageDigestAlgorithm)) { run(messageDigestAlgorithm + " ", messageDigestAlgorithm); } } } private void run(final String prefix, final MessageDigest messageDigest) throws IOException { if (inputs == null) { println(prefix, DigestUtils.digest(messageDigest, System.in)); return; } for (final String source : inputs) { final File file = new File(source); if (file.isFile()) { println(prefix, DigestUtils.digest(messageDigest, file), source); } else if (file.isDirectory()) { final File[] listFiles = file.listFiles(); if (listFiles != null) { run(prefix, messageDigest, listFiles); } } else { // use the default charset for the command-line parameter final byte[] bytes = source.getBytes(Charset.defaultCharset()); println(prefix, DigestUtils.digest(messageDigest, bytes)); } } } private void run(final String prefix, final MessageDigest messageDigest, final File[] files) throws IOException { for (final File file : files) { if (file.isFile()) { println(prefix, DigestUtils.digest(messageDigest, file), file.getName()); } } } private void run(final String prefix, final String messageDigestAlgorithm) throws IOException { run(prefix, DigestUtils.getDigest(messageDigestAlgorithm)); } @Override public String toString() { return String.format("%s %s", super.toString(), Arrays.toString(args)); } }




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