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// 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.cloudstack.framework.security.keystore;

import java.sql.PreparedStatement;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import javax.ejb.Local;

import org.springframework.stereotype.Component;

import com.cloud.utils.db.DB;
import com.cloud.utils.db.GenericDaoBase;
import com.cloud.utils.db.SearchBuilder;
import com.cloud.utils.db.SearchCriteria;
import com.cloud.utils.db.SearchCriteria.Op;
import com.cloud.utils.db.TransactionLegacy;
import com.cloud.utils.exception.CloudRuntimeException;

@Component
@Local(value = {KeystoreDao.class})
public class KeystoreDaoImpl extends GenericDaoBase<KeystoreVO, Long> implements KeystoreDao {
    protected final SearchBuilder<KeystoreVO> FindByNameSearch;
    protected final SearchBuilder<KeystoreVO> CertChainSearch;

    public KeystoreDaoImpl() {
        FindByNameSearch = createSearchBuilder();
        FindByNameSearch.and("name", FindByNameSearch.entity().getName(), Op.EQ);
        FindByNameSearch.done();

        CertChainSearch = createSearchBuilder();
        CertChainSearch.and("key", CertChainSearch.entity().getKey(), Op.NULL);
        CertChainSearch.done();
    }

    @Override
    public List<KeystoreVO> findCertChain() {
        SearchCriteria<KeystoreVO> sc = CertChainSearch.create();
        List<KeystoreVO> ks = listBy(sc);
        Collections.sort(ks, new Comparator() {
            @Override
            public int compare(Object o1, Object o2) {
                Integer seq1 = ((KeystoreVO)o1).getIndex();
                Integer seq2 = ((KeystoreVO)o2).getIndex();
                return seq1.compareTo(seq2);
            }
        });
        return ks;
    }

    @Override
    public KeystoreVO findByName(String name) {
        assert (name != null);

        SearchCriteria<KeystoreVO> sc = FindByNameSearch.create();
        sc.setParameters("name", name);
        return findOneBy(sc);
    }

    @Override
    @DB
    public void save(String name, String certificate, String key, String domainSuffix) {
        TransactionLegacy txn = TransactionLegacy.currentTxn();
        try {
            txn.start();

            String sql =
                "INSERT INTO keystore (`name`, `certificate`, `key`, `domain_suffix`) VALUES (?, ?, ?, ?) ON DUPLICATE KEY UPDATE `certificate`=?, `key`=?, `domain_suffix`=?";
            PreparedStatement pstmt = txn.prepareAutoCloseStatement(sql);
            pstmt.setString(1, name);
            pstmt.setString(2, certificate);
            pstmt.setString(3, key);
            pstmt.setString(4, domainSuffix);
            pstmt.setString(5, certificate);
            pstmt.setString(6, key);
            pstmt.setString(7, domainSuffix);

            pstmt.executeUpdate();
            txn.commit();
        } catch (Exception e) {
            txn.rollback();
            throw new CloudRuntimeException("Unable to save certificate under name " + name + " due to exception", e);
        }
    }

    @Override
    @DB
    public void save(String alias, String certificate, Integer index, String domainSuffix) {
        KeystoreVO ks = findByName(alias);
        if (ks != null) {
            ks.setCertificate(certificate);
            ks.setName(alias);
            ks.setIndex(index);
            ks.setDomainSuffix(domainSuffix);
            this.update(ks.getId(), ks);
        } else {
            KeystoreVO newks = new KeystoreVO();
            newks.setCertificate(certificate);
            newks.setName(alias);
            newks.setIndex(index);
            newks.setDomainSuffix(domainSuffix);
            persist(newks);
        }
    }
}
