/*
 *
 * Copyright (c) 2013 - 2017 Lijun Liao
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 *
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * THE AUTHOR LIJUN LIAO. LIJUN LIAO DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the XiPKI software without
 * disclosing the source code of your own applications.
 *
 * For more information, please contact Lijun Liao at this
 * address: lijun.liao@gmail.com
 */

package org.xipki.commons.security.shell;

import java.io.File;

import org.apache.karaf.shell.api.action.Command;
import org.apache.karaf.shell.api.action.Completion;
import org.apache.karaf.shell.api.action.Option;
import org.apache.karaf.shell.api.action.lifecycle.Service;
import org.xipki.commons.common.util.IoUtil;
import org.xipki.commons.common.util.ParamUtil;
import org.xipki.commons.common.util.StringUtil;
import org.xipki.commons.console.karaf.IllegalCmdParamException;
import org.xipki.commons.console.karaf.completer.FilePathCompleter;
import org.xipki.commons.password.OBFPasswordService;
import org.xipki.commons.password.PBEPasswordService;

/**
 * @author Lijun Liao
 * @since 2.0.0
 */

@Command(scope = "xipki-tk", name = "pbe-dec",
        description = "decrypt password with master password")
@Service
// CHECKSTYLE:SKIP
public class PBEDecryptCmd extends SecurityCommandSupport {

    @Option(name = "--password",
            description = "encrypted password, starts with PBE:\n"
                    + "exactly one of password and password-file must be specified")
    private String passwordHint;

    @Option(name = "--password-file", description = "file containing the encrypted password")
    @Completion(FilePathCompleter.class)
    private String passwordFile;

    @Option(name = "--mpassword-file",
            description = "file containing the (obfuscated) master password")
    @Completion(FilePathCompleter.class)
    private String masterPasswordFile;

    @Option(name = "--mk", description = "quorum of the master password parts")
    private Integer mquorum = 1;

    @Option(name = "--out", description = "where to save the password")
    @Completion(FilePathCompleter.class)
    private String outFile;

    @Override
    protected Object doExecute() throws Exception {
        ParamUtil.requireRange("mk", mquorum, 1, 10);
        if (!(passwordHint == null ^ passwordFile == null)) {
            throw new IllegalCmdParamException(
                    "exactly one of password and password-file must be specified");
        }

        if (passwordHint == null) {
            passwordHint = new String(IoUtil.read(passwordFile));
        }

        if (!StringUtil.startsWithIgnoreCase(passwordHint, "PBE:")) {
            throw new IllegalCmdParamException("encrypted password '" + passwordHint
                    + "' does not start with PBE:");
        }

        char[] masterPassword;
        if (masterPasswordFile != null) {
            String str = new String(IoUtil.read(masterPasswordFile));
            if (str.startsWith("OBF:") || str.startsWith("obf:")) {
                str = OBFPasswordService.deobfuscate(str);
            }
            masterPassword = str.toCharArray();
        } else {
            if (mquorum == 1) {
                masterPassword = readPassword("Master password");
            } else {
                char[][] parts = new char[mquorum][];
                for (int i = 0; i < mquorum; i++) {
                    parts[i] = readPassword("Master password (part " + (i + 1) + "/" + mquorum
                            + ")");
                }
                masterPassword = StringUtil.merge(parts);
            }
        }
        char[] password = PBEPasswordService.decryptPassword(masterPassword, passwordHint);

        if (outFile != null) {
            saveVerbose("saved the password to file", new File(outFile),
                    new String(password).getBytes());
        } else {
            println("the password is: '" + new String(password) + "'");
        }
        return null;
    }

}