/**
 * 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.pulsar.client.tutorial;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Map;

import org.apache.pulsar.client.api.CryptoKeyReader;
import org.apache.pulsar.client.api.EncryptionKeyInfo;
import org.apache.pulsar.client.api.Producer;
import org.apache.pulsar.client.api.PulsarClient;
import org.apache.pulsar.client.api.PulsarClientException;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class SampleCryptoProducer {

    public static void main(String[] args) throws PulsarClientException, InterruptedException, IOException {

        class RawFileKeyReader implements CryptoKeyReader {

            String publicKeyFile = "";
            String privateKeyFile = "";

            RawFileKeyReader(String pubKeyFile, String privKeyFile) {
                publicKeyFile = pubKeyFile;
                privateKeyFile = privKeyFile;
            }

            @Override
            public EncryptionKeyInfo getPublicKey(String keyName, Map<String, String> keyMeta) {

                EncryptionKeyInfo keyInfo = new EncryptionKeyInfo();
                try {
                    // Read the public key from the file
                    keyInfo.setKey(Files.readAllBytes(Paths.get(publicKeyFile)));
                } catch (IOException e) {
                    log.error("Failed to read public key from file {}", publicKeyFile, e);
                }
                return keyInfo;
            }

            @Override
            public EncryptionKeyInfo getPrivateKey(String keyName, Map<String, String> keyMeta) {

                EncryptionKeyInfo keyInfo = new EncryptionKeyInfo();
                try {
                    // Read the private key from the file
                    keyInfo.setKey(Files.readAllBytes(Paths.get(privateKeyFile)));
                } catch (IOException e) {
                    log.error("Failed to read private key from file {}", privateKeyFile, e);
                }
                return keyInfo;
            }
        }

        PulsarClient pulsarClient = PulsarClient.builder().serviceUrl("http://127.0.0.1:8080").build();

        // Setup the CryptoKeyReader with the file name where public/private key is kept
        Producer<byte[]> producer = pulsarClient.newProducer().topic("persistent://my-tenant/my-ns/my-topic")
                .cryptoKeyReader(new RawFileKeyReader("test_ecdsa_pubkey.pem", "test_ecdsa_privkey.pem"))
                .addEncryptionKey("myappkey").create();

        for (int i = 0; i < 10; i++) {
            producer.send("my-message".getBytes());
        }

        pulsarClient.close();
    }
}
