/**
 * 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.zookeeper.common;

import java.io.File;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.util.Optional;

import org.apache.zookeeper.util.PemReader;

/**
 * Implementation of {@link FileKeyStoreLoader} that loads from PEM files.
 */
class PEMFileLoader extends FileKeyStoreLoader {
    private PEMFileLoader(String keyStorePath,
                          String trustStorePath,
                          String keyStorePassword,
                          String trustStorePassword) {
        super(keyStorePath, trustStorePath, keyStorePassword, trustStorePassword);
    }

    @Override
    public KeyStore loadKeyStore() throws IOException, GeneralSecurityException {
        Optional<String> passwordOption;
        if (keyStorePassword == null || keyStorePassword.length() == 0) {
            passwordOption = Optional.empty();
        } else {
            passwordOption = Optional.of(keyStorePassword);
        }
        File file = new File(keyStorePath);
        return PemReader.loadKeyStore(file, file, passwordOption);
    }

    @Override
    public KeyStore loadTrustStore() throws IOException, GeneralSecurityException {
        return PemReader.loadTrustStore(new File(trustStorePath));
    }


    static class Builder extends FileKeyStoreLoader.Builder<PEMFileLoader> {
        @Override
        PEMFileLoader build() {
            return new PEMFileLoader(keyStorePath, trustStorePath, keyStorePassword, trustStorePassword);
        }
    }
}
