AWS Java SDK Example

The following example shows how AWS Java SDK can be used to interact with Telnyx Cloud Storage.

<dependency>
	<groupId>software.amazon.awssdk</groupId>
	<artifactId>s3</artifactId>
	<version>2.20.0</version> <!--  Or any 2.x version -->
</dependency>

import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.CreateBucketRequest;

public class CreateBucket {

	public static void main(String[] args) {
    	String bucketName = "--your-bucket-name--";
    	Region region = Region.US_EAST_1;
    	String telnyxUrl = "https://us-central-1.telnyxcloudstorage.com";
    	String telnyxApiKey = "-- api key --";

    	// Create an S3 client
    	S3Client s3 = S3Client.builder()
            	.region(region)
            	.endpointOverride(URI.create(telnyxUrl))
            	.credentialsProvider(
                    	StaticCredentialsProvider.create(AwsBasicCredentials.create(telnyxApiKey, "does not matter")))
            	.build();

    	// create bucket
    	CreateBucketRequest createBucketRequest = CreateBucketRequest.builder()
            	.bucket(bucketName)
            	.build();

    	s3.createBucket(createBucketRequest);
    	System.out.println("Bucket created successfully: " + bucketName);

    	// Close the S3 client
    	s3.close();
	}

}

import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
import software.amazon.awssdk.core.sync.RequestBody;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.PutObjectRequest;

import java.net.URI;
import java.nio.file.Paths;

public class UploadObjectToS3 {


	public static void main(String[] args) {
    	String bucketName = "--your-bucket-name--";
    	String keyName = "your-object-key";
    	String filePath = "--path to file for upload--";

    	Region region = Region.US_EAST_1;
    	String telnyxUrl = "https://us-central-1.telnyxcloudstorage.com";
    	String telnyxApiKey = "--your api key --";

    	// Create an S3 client
    	S3Client s3 = S3Client.builder()
            	.region(region)
            	.endpointOverride(URI.create(telnyxUrl))
            	.credentialsProvider(
                    	StaticCredentialsProvider.create(AwsBasicCredentials.create(telnyxApiKey, "does not matter")))
            	.build();

    	// upload object
    	PutObjectRequest putObjectRequest = PutObjectRequest.builder()
            	.bucket(bucketName)
            	.key(keyName)
            	.build();

    	// Upload the file to S3
    	s3.putObject(putObjectRequest, RequestBody.fromFile(Paths.get(filePath)));

    	// Close the S3 client
    	s3.close();
	}

}

import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.ListObjectsV2Request;
import software.amazon.awssdk.services.s3.model.ListObjectsV2Response;
import software.amazon.awssdk.services.s3.model.S3Object;

import java.net.URI;

public class ListObjects {

	public static void main(String[] args) {
    	String bucketName = "--your-bucket-name--";
    	Region region = Region.US_EAST_1;
    	String telnyxUrl = "https://us-central-1.telnyxcloudstorage.com";
    	String telnyxApiKey = "--your api key --";

    	// Create an S3 client
    	S3Client s3 = S3Client.builder()
            	.region(region)
            	.endpointOverride(URI.create(telnyxUrl))
            	.credentialsProvider(
                    	StaticCredentialsProvider.create(AwsBasicCredentials.create(telnyxApiKey, "does not matter")))
            	.build();
    	// Create a ListObjectsV2Request
    	ListObjectsV2Request listObjectsRequest = ListObjectsV2Request.builder()
            	.bucket(bucketName)
            	.build();

    	// Get the list of objects in the bucket
    	ListObjectsV2Response listObjectsResponse = s3.listObjectsV2(listObjectsRequest);

    	for (S3Object s3Object : listObjectsResponse.contents()) {
        	System.out.println( s3Object.key());
    	}

    	// Close the S3 client
    	s3.close();
	}

}

import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
import software.amazon.awssdk.core.ResponseBytes;
import software.amazon.awssdk.core.sync.ResponseTransformer;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.GetObjectRequest;
import software.amazon.awssdk.services.s3.model.GetObjectResponse;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URI;

public class DownloadObject {

	public static void main(String[] args) throws IOException {
    	String bucketName = "--your-bucket-name--";
    	Region region = Region.US_EAST_1;
    	String telnyxUrl = "https://us-central-1.telnyxcloudstorage.com";
    	String telnyxApiKey = "--your api key --";
    	String keyName = "your-object-key";

    	S3Client s3 = S3Client.builder()
            	.region(region)
            	.endpointOverride(URI.create(telnyxUrl))
            	.credentialsProvider(
                    	StaticCredentialsProvider.create(AwsBasicCredentials.create(telnyxApiKey, "does not matter")))
            	.build();

    	// Create a GetObjectRequest
    	GetObjectRequest getObjectRequest = GetObjectRequest.builder()
            	.bucket(bucketName)
            	.key(keyName)
            	.build();

    	// Download the object and transform the response to a byte array
    	ResponseBytes<GetObjectResponse> objectBytes = s3.getObject(getObjectRequest, ResponseTransformer.toBytes());

    	// Write the file to the specified path
    	File downloadedFile = new File("-- path to where to save the file --");
    	try (FileOutputStream fos = new FileOutputStream(downloadedFile)) {
        	fos.write(objectBytes.asByteArray());
        	System.out.println("File downloaded successfully to -- path to where to save the file --");
    	}

    	// Close the S3 client
    	s3.close();
	}

}

In order for this part to work, we will need to add json decoding library and http client. Any libraries will do, but for this example we picked: gson and okhttp3.

<dependency>
    	<groupId>com.squareup.okhttp3</groupId>
    	<artifactId>okhttp</artifactId>
    	<version>4.9.2</version>
</dependency>
<dependency>
    	<groupId>com.google.code.gson</groupId>
    	<artifactId>gson</artifactId>
    	<version>2.8.7</version>
</dependency>

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import okhttp3.*;

import java.io.IOException;
import java.util.Map;

public class GeneratePresignedURLAndDownloadObject {

	public static void main(String[] args) throws IOException {
    	OkHttpClient httpClient = new OkHttpClient();
    	Gson gson = new Gson();

    	String presignedUrlRequestJson = gson.toJson(Map.of("TTL", 30));
    	RequestBody presignedUrlRequestBody = RequestBody.create(MediaType.parse("application/json"), presignedUrlRequestJson);

    	Request presignedUrlRequest = new Request.Builder()
            	.url("https://api.telnyx.com/v2/storage/buckets/-- name of the bucket --/--name of the object--/presigned_url")
            	.header("Authorization", "Bearer --your api key---")
            	.post(presignedUrlRequestBody)
            	.build();

    	try (Response response = httpClient.newCall(presignedUrlRequest).execute()) {
        	if (!response.isSuccessful()) {
            	throw new IOException("Failed to create presigned URL: " + response);
        	}
        	String responseBody = response.body().string();
        	Map<String, Object> responseBodyMap = gson.fromJson(responseBody, new TypeToken<Map<String, Object>>() {}.getType());
        	String presignedUrl = ((Map<String, String>) responseBodyMap.get("data")).get("presigned_url");

        	System.out.println("Presigned URL: " + presignedUrl);

        	// 6. Download the file using the presigned URL
        	Request downloadRequest = new Request.Builder()
                	.url(presignedUrl)
                	.build();

        	try (Response downloadResponse = httpClient.newCall(downloadRequest).execute()) {
            	if (!downloadResponse.isSuccessful()) {
                	throw new IOException("Failed to download file using presigned URL: " + downloadResponse);
            	}
            	System.out.println("Downloaded via presigned URL: " + downloadResponse.body().string());
        	}
    	}
	}
}