/*
 *
 * 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.pki.ca.client.shell;

import java.io.File;
import java.math.BigInteger;
import java.security.cert.X509CRL;
import java.util.Set;

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.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.x509.Extension;
import org.xipki.commons.common.RequestResponseDebug;
import org.xipki.commons.console.karaf.CmdFailure;
import org.xipki.commons.console.karaf.IllegalCmdParamException;
import org.xipki.commons.console.karaf.completer.FilePathCompleter;
import org.xipki.pki.ca.client.api.CaClientException;
import org.xipki.pki.ca.client.api.PkiErrorException;

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

@Command(scope = "xipki-cli", name = "getcrl",
        description = "download CRL")
@Service
public class GetCrlCmd extends CrlCommandSupport {

    @Option(name = "--with-basecrl",
            description = "whether to retrieve the baseCRL if the current CRL is a delta CRL")
    private Boolean withBaseCrl = Boolean.FALSE;

    @Option(name = "--basecrl-out",
            description = "where to save the baseCRL\n"
                    + "(defaults to <out>-baseCRL)")
    @Completion(FilePathCompleter.class)
    private String baseCrlOut;

    @Override
    protected X509CRL retrieveCrl() throws CaClientException, PkiErrorException {
        RequestResponseDebug debug = getRequestResponseDebug();
        try {
            return caClient.downloadCrl(caName, debug);
        } finally {
            saveRequestResponse(debug);
        }
    }

    @Override
    protected Object doExecute() throws Exception {
        Set<String> caNames = caClient.getCaNames();
        if (isEmpty(caNames)) {
            throw new IllegalCmdParamException("no CA is configured");
        }

        if (caName != null && !caNames.contains(caName)) {
            throw new IllegalCmdParamException("CA " + caName + " is not within the configured CAs "
                    + caNames);
        }

        if (caName == null) {
            if (caNames.size() == 1) {
                caName = caNames.iterator().next();
            } else {
                throw new IllegalCmdParamException("no CA is specified, one of " + caNames
                        + " is required");
            }
        }

        X509CRL crl = null;
        try {
            crl = retrieveCrl();
        } catch (PkiErrorException ex) {
            throw new CmdFailure("received no CRL from server: " + ex.getMessage());
        }

        if (crl == null) {
            throw new CmdFailure("received no CRL from server");
        }

        saveVerbose("saved CRL to file", new File(outFile), crl.getEncoded());

        if (!withBaseCrl.booleanValue()) {
            return null;
        }

        byte[] octetString = crl.getExtensionValue(Extension.deltaCRLIndicator.getId());
        if (octetString == null) {
            return null;
        }

        if (baseCrlOut == null) {
            baseCrlOut = outFile + "-baseCRL";
        }

        byte[] extnValue = DEROctetString.getInstance(octetString).getOctets();
        BigInteger baseCrlNumber = ASN1Integer.getInstance(extnValue).getPositiveValue();

        RequestResponseDebug debug = getRequestResponseDebug();
        try {
            crl = caClient.downloadCrl(caName, baseCrlNumber, debug);
        } catch (PkiErrorException ex) {
            throw new CmdFailure("received no baseCRL from server: " + ex.getMessage());
        } finally {
            saveRequestResponse(debug);
        }

        if (crl == null) {
            throw new CmdFailure("received no baseCRL from server");
        }

        saveVerbose("saved baseCRL to file", new File(baseCrlOut), crl.getEncoded());
        return null;
    } // method doExecute

}