APIGatewayRequestDeserializationFunction.java

/*
 * Copyright 2023 Amazon.com, Inc. or its affiliates.
 * 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 org.demo.serialization;

import static software.amazon.lambda.powertools.utilities.EventDeserializer.extractDataFrom;

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.services.lambda.runtime.events.APIGatewayProxyRequestEvent;
import com.amazonaws.services.lambda.runtime.events.APIGatewayProxyResponseEvent;
import java.util.HashMap;
import java.util.Map;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;


public class APIGatewayRequestDeserializationFunction
        implements RequestHandler<APIGatewayProxyRequestEvent, APIGatewayProxyResponseEvent> {

    private final static Logger LOGGER = LogManager.getLogger(APIGatewayRequestDeserializationFunction.class);
    private static final Map<String, String> HEADERS = new HashMap<String, String>() {{
        put("Content-Type", "application/json");
        put("X-Custom-Header", "application/json");
    }};

    public APIGatewayProxyResponseEvent handleRequest(APIGatewayProxyRequestEvent event, Context context) {

        Product product = extractDataFrom(event).as(Product.class);
        LOGGER.info("\n=============== Deserialized request body: ===============");
        LOGGER.info("product={}\n", product);

        return new APIGatewayProxyResponseEvent()
                .withHeaders(HEADERS)
                .withStatusCode(200)
                .withBody("Received request for productId: " + product.getId());
    }
}