ArticleHandler.java

package example;

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.LambdaLogger;
import com.amazonaws.util.StringUtils;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import example.model.ApiGatewayRequest;
import example.model.ApiGatewayResponse;
import example.model.Article;
import java.util.HashMap;
import java.util.Map;

public class ArticleHandler {
    
    public ApiGatewayResponse handleRequest(ApiGatewayRequest request, Context context) {
        LambdaLogger logger = context.getLogger();
        Map<String, String> queryParams = request.getQueryStringParameters();
        String body = request.getBody();
        logger.log("received query params: " + request.getQueryStringParameters());
        logger.log("received body: " + body);
        
        // Get "title" from url parameter
        String title = "";
        if (queryParams != null && !StringUtils.isNullOrEmpty(queryParams.get("title"))) {
            title = request.getQueryStringParameters().get("title");
        }
        // Make article
        Article article = new Article();
        article.setTitle("name: "+title);
        article.setDescription("body: "+body);
        
        // Convert article to json
        ObjectMapper om = new ObjectMapper();
        String responseBodyJson = null;
        try {
            responseBodyJson = om.writeValueAsString(article);
        } catch (JsonProcessingException e) {
            logger.log("Error: convert article to json failed. Exception - " + e.getMessage());
        }
        
        // Make response
        Map<String, String> headers = new HashMap<>();
        headers.put("Content-Type", "application/json");
        ApiGatewayResponse response = new ApiGatewayResponse();
        response.setStatusCode("200");
        response.setHeaders(headers);
        response.setBody(responseBodyJson);
        return response;
    }
}