AmazonS3Client(credentials) is deprecated

Question

I'm trying to read the files available on Amazon S3, as the question explains the problem. I couldn't find an alternative call for the deprecated constructor.

Here's the code:

private String AccessKeyID = "xxxxxxxxxxxxxxxxxxxx";
private String SecretAccessKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
private static String bucketName     = "documentcontainer";
private static String keyName     = "test";
//private static String uploadFileName    = "/PATH TO FILE WHICH WANT TO UPLOAD/abc.txt";

AWSCredentials credentials = new BasicAWSCredentials(AccessKeyID, SecretAccessKey);

void downloadfile() throws IOException
{

    // Problem lies here - AmazonS3Client is deprecated
    AmazonS3 s3client = new AmazonS3Client(credentials);
        try {
        System.out.println("Downloading an object...");
        S3Object s3object = s3client.getObject(new GetObjectRequest(
                bucketName, keyName));
        System.out.println("Content-Type: "  +
                s3object.getObjectMetadata().getContentType());
        InputStream input = s3object.getObjectContent();

        BufferedReader reader = new BufferedReader(new InputStreamReader(input));
        while (true) {
            String line = reader.readLine();
            if (line == null) break;

            System.out.println("    " + line);
        }
        System.out.println();
    } catch (AmazonServiceException ase) {
          //do something
    } catch (AmazonClientException ace) {
        // do something
    }
 }

Any help? If more explanation is needed please mention it. I have checked on the sample code provided in .zip file of SDK, and it's the same.

Answer 1

You can either use AmazonS3ClientBuilder or AwsClientBuilder as alternatives.

For S3, simplest would be with AmazonS3ClientBuilder.

BasicAWSCredentials creds = new BasicAWSCredentials("access_key", "secret_key"); 

AmazonS3 s3Client = AmazonS3ClientBuilder
    .standard()
    .withCredentials(new AWSStaticCredentialsProvider(creds))
    .build();

Answer 2

Use the code listed below to create an S3 client without credentials:

AmazonS3 s3Client = AmazonS3ClientBuilder.standard().build();

An usage example would be a lambda function calling S3.

Answer 3

You need to pass the region information through the

com.amazonaws.regions.Region object.

Use AmazonS3Client(credentials, Region.getRegion(Regions.REPLACE_WITH_YOUR_REGION))

Answer 4

You can create S3 default client as follows(with aws-java-sdk-s3-1.11.232):

AmazonS3ClientBuilder.defaultClient();

Answer 5

Deprecated with only creentials in constructor, you can use something like this:

 val awsConfiguration = AWSConfiguration(context)
 val awsCreds = CognitoCachingCredentialsProvider(context, awsConfiguration)
 val s3Client = AmazonS3Client(awsCreds, Region.getRegion(Regions.EU_CENTRAL_1))

Answer 6

Using the AWS SDK for Java 2.x, one can also build its own credentialProvider like so:

// Credential provider

package com.myproxylib.aws;

import software.amazon.awssdk.auth.credentials.AwsCredentials;
import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;

public class CustomCredentialsProvider implements AwsCredentialsProvider {

    private final String accessKeyId;
    private final String secretAccessKey;

    public CustomCredentialsProvider(String accessKeyId, String secretAccessKey) {
        this.secretAccessKey = secretAccessKey;
        this.accessKeyId = accessKeyId;
    }

    @Override
    public AwsCredentials resolveCredentials() {
        return new CustomAwsCredentialsResolver(accessKeyId, secretAccessKey);
    }

}

// Crenditals resolver

package com.myproxylib.aws;

import software.amazon.awssdk.auth.credentials.AwsCredentials;

public class CustomAwsCredentialsResolver implements AwsCredentials {

    private final String accessKeyId;
    private final String secretAccessKey;

    CustomAwsCredentialsResolver(String accessKeyId, String secretAccessKey) {
        this.secretAccessKey = secretAccessKey;
        this.accessKeyId = accessKeyId;
    }

    @Override
    public String accessKeyId() {
        return accessKeyId;
    }

    @Override
    public String secretAccessKey() {
        return secretAccessKey;
    }
}

// Usage of the provider

package com.myproxylib.aws.s3;

public class S3Storage implements IS3StorageCapable {

    private final S3Client s3Client;

    public S3Storage(String accessKeyId, String secretAccessKey, String region) {

        this.s3Client = S3Client.builder().credentialsProvider(new CustomCredentialsProvider(accessKeyId, secretAccessKey)).region(of(region)).build();
    }

NOTE:

1. of course, the library user can get the credentials from wherever he wants, parse it into a java Properties before calling the S3 constructor.

2. When possible, favour the other methods mentionned in other answers and doc. My use case was necessary for this.

Answer 7

implementation 'com.amazonaws:aws-android-sdk-s3:2.16.12'

val key = "XXX"
val secret = "XXX"
val credentials = BasicAWSCredentials(key, secret)
val s3 = AmazonS3Client(
    credentials, com.amazonaws.regions.Region.getRegion(
        Regions.US_EAST_2
    )
)
val expires = Date(Date().time + 1000 * 60 * 60)

val keyFile = "13/thumbnail_800x600_13_photo.jpeg"
val generatePresignedUrlRequest = GeneratePresignedUrlRequest(
    "bucket_name",
    keyFile
)
generatePresignedUrlRequest.expiration = expires
val url: URL = s3.generatePresignedUrl(generatePresignedUrlRequest)

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    .apply(RequestOptions.centerCropTransform())
    .into(image)