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Geospatial visualization extension of GeoSpark
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/*
 * FILE: S3Operator
 * Copyright (c) 2015 - 2019 GeoSpark Development Team
 *
 * 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.datasyslab.geosparkviz.utils;

import com.amazonaws.auth.AWSStaticCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3ClientBuilder;
import com.amazonaws.services.s3.model.Bucket;
import com.amazonaws.services.s3.model.ObjectMetadata;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.services.s3.model.S3Object;
import org.apache.log4j.Logger;

import javax.imageio.ImageIO;

import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class S3Operator
{

    private AmazonS3 s3client;

    public final static Logger logger = Logger.getLogger(S3Operator.class);

    public S3Operator(String regionName, String accessKey, String secretKey)
    {
        Regions region = Regions.fromName(regionName);
        BasicAWSCredentials awsCreds = new BasicAWSCredentials(accessKey, secretKey);
        s3client = AmazonS3ClientBuilder.standard().withRegion(region).withCredentials(new AWSStaticCredentialsProvider(awsCreds)).build();
        logger.info("[GeoSparkViz][Constructor] Initialized a S3 client");
    }

    public boolean createBucket(String bucketName)
    {
        Bucket bucket = s3client.createBucket(bucketName);
        logger.info("[GeoSparkViz][createBucket] Created a bucket: " + bucket.toString());
        return true;
    }

    public boolean deleteImage(String bucketName, String path)
    {
        s3client.deleteObject(bucketName, path);
        logger.info("[GeoSparkViz][deleteImage] Deleted an image if exist");
        return true;
    }

    public boolean putImage(String bucketName, String path, BufferedImage rasterImage)
            throws IOException
    {
        deleteImage(bucketName, path);

        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ImageIO.write(rasterImage, "png", outputStream);
        byte[] buffer = outputStream.toByteArray();
        InputStream inputStream = new ByteArrayInputStream(buffer);
        ObjectMetadata metadata = new ObjectMetadata();
        metadata.setContentLength(buffer.length);
        s3client.putObject(new PutObjectRequest(bucketName, path, inputStream, metadata));
        inputStream.close();
        outputStream.close();
        logger.info("[GeoSparkViz][putImage] Put an image");
        return true;
    }

    public BufferedImage getImage(String bucketName, String path)
            throws Exception
    {
        logger.debug("[GeoSparkViz][getImage] Start");
        S3Object s3Object = s3client.getObject(bucketName, path);
        InputStream inputStream = s3Object.getObjectContent();
        BufferedImage rasterImage = ImageIO.read(inputStream);
        inputStream.close();
        s3Object.close();
        logger.info("[GeoSparkViz][getImage] Got an image");
        return rasterImage;
    }
}