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I'm tasked with writing a file into our S3 bucket from java.

I have set up the IAM role. I have a certificate, a private key, a trust-anchor-arn, a profile-arn, and a role-arn.

I can then make an S3Client using a ProcessCredentialsProvider that calls out to aws_signing_helper, which returns json that includes fields for AccessKeyId, SessionToken, etc. This works.

I do not want to call out to an external process. There doesn't seem to be a way using pure java to make the API calls.

Is it possible to get the credentials without calling out to an external program? If so, how?

I'm tasked with writing a file into our S3 bucket from java.

I have set up the IAM role. I have a certificate, a private key, a trust-anchor-arn, a profile-arn, and a role-arn.

I can then make an S3Client using a ProcessCredentialsProvider that calls out to aws_signing_helper, which returns json that includes fields for AccessKeyId, SessionToken, etc. This works.

I do not want to call out to an external process. There doesn't seem to be a way using pure java to make the API calls.

Is it possible to get the credentials without calling out to an external program? If so, how?

• java
• amazon-web-services
• amazon-s3

Share Improve this question Follow edited Nov 21, 2024 at 21:19 Gord asked Nov 20, 2024 at 20:26 GordGord 1555 bronze badges

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1 Answer 1

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These concepts are explained in the AWS SDK for Java V2 Developer Guide. See this topic:

Configure SDK authentication

Once you select a credentials provider, you can create a S3AsyncClient to place a file into an S3 bucket.

/**
     * Uploads a local file to an AWS S3 bucket asynchronously.
     *
     * @param bucketName the name of the S3 bucket to upload the file to
     * @param key        the key (object name) to use for the uploaded file
     * @param objectPath the local file path of the file to be uploaded
     * @return a {@link CompletableFuture} that completes with the {@link PutObjectResponse} when the upload is successful, or throws a {@link RuntimeException} if the upload fails
     */
    public CompletableFuture<PutObjectResponse> uploadLocalFileAsync(String bucketName, String key, String objectPath) {
        PutObjectRequest objectRequest = PutObjectRequest.builder()
            .bucket(bucketName)
            .key(key)
            .build();

        CompletableFuture<PutObjectResponse> response = getAsyncClient().putObject(objectRequest, AsyncRequestBody.fromFile(Paths.get(objectPath)));
        return response.whenComplete((resp, ex) -> {
            if (ex != null) {
                throw new RuntimeException("Failed to upload file", ex);
            }
        });
    }

credentails file

[default]
aws_access_key_id = <Value>
aws_secret_access_key = <Value>
region = us-east-1

Once you setup that file, your AWS Service clients will pick up your keys.

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