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Kafka Compatible Schema Registry
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/**
 * Copyright (c) 2019 - 2024 StreamNative, Inc.. All Rights Reserved.
 */
/**
 * Licensed 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 io.streamnative.pulsar.handlers.kop.schemaregistry.model;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.streamnative.pulsar.handlers.kop.schemaregistry.exceptions.SerializationException;
import java.io.IOException;
import java.util.Map;
import org.apache.pulsar.common.util.ObjectMapperFactory;

/**
 * This class is used to serialize and deserialize schema registry keys and values.
 */
public class SchemaStorageSerializer {

    private static final ObjectMapper objectMapper = ObjectMapperFactory.getMapper().getObjectMapper();

    public static String serializeKey(SchemaRegistryKey key) throws SerializationException {
        try {
            return objectMapper.writeValueAsString(key);
        } catch (IOException e) {
            throw new SerializationException("Error while serializing schema key", e);
        }
    }

    public static byte[] serializeValue(SchemaRegistryValue value) throws SerializationException {
        try {
            return objectMapper.writeValueAsBytes(value);
        } catch (IOException e) {
            throw new SerializationException("Error while serializing schema value", e);
        }
    }

    public static SchemaRegistryKey deserializeKey(String str) throws SerializationException {
        SchemaRegistryKeyType keyType = null;
        try {
            Map map = objectMapper.readValue(str, new TypeReference<>() {});
            keyType = SchemaRegistryKeyType.forName((String) map.get("keyType"));
            return switch (keyType) {
                case CONFIG -> objectMapper.readValue(str, ConfigKey.class);
                case SCHEMA -> objectMapper.readValue(str, SchemaKey.class);
            };
        } catch (IOException e) {
            String type = "unknown";
            if (keyType != null) {
                type = keyType.name();
            }
            throw new SerializationException("Error while deserializing key type " + type, e);
        }
    }

    public static SchemaRegistryValue deserializeValue(SchemaRegistryKey key, byte[] data)
            throws SerializationException {
        if (data == null) {
            return null;
        }
        switch (key.getKeyType()) {
            case CONFIG -> {
                try {
                    return objectMapper.readValue(data, ConfigValue.class);
                } catch (IOException e) {
                    throw new SerializationException("Error while deserializing config.", e);
                }
            }
            case SCHEMA -> {
                try {
                    return objectMapper.readValue(data, SchemaValue.class);
                } catch (Exception e) {
                    throw new SerializationException("Error while deserializing schema.", e);
                }
            }
            default -> throw new SerializationException("Unknown key type: " + key.getKeyType());
        }
    }

}