001/*
002 * SPDX-License-Identifier: Apache-2.0
003 *
004 * Copyright 2025-2026 The Enola <https://enola.dev> Authors
005 *
006 * Licensed under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 *     https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package dev.enola.cli;
019
020import io.ipfs.multibase.Multibase;
021import io.ipfs.multihash.Multihash;
022
023import picocli.CommandLine;
024
025@CommandLine.Command(
026        name = "multihash",
027        description = "Deconstructs a Multihash into its components")
028public class MultihashCommand implements Runnable {
029
030    @CommandLine.Spec CommandLine.Model.CommandSpec spec;
031
032    @CommandLine.Parameters(index = "0", paramLabel = "multihash", description = "Multihash")
033    String multihashString;
034
035    @Override
036    public void run() {
037        var multihash = Multihash.decode(multihashString);
038        var pw = spec.commandLine().getOut();
039        pw.println(toString(multihashString, multihash));
040    }
041
042    static String toString(String multihashString, Multihash multihash) {
043        var base = Multibase.encoding(multihashString);
044        return base.name()
045                + " - "
046                + multihash.getType()
047                + " - "
048                + multihash.getHash().length
049                + " bytes";
050    }
051}