I have setup an FTPS server with PROFTPD on ec2 and mounted it on s3. I want to upload and download files using java that will first pass ec2 to have an FTPS transfer before it goes to S3. How and what's the best way to do it?

****Client > EC2 > S3 (upload a file to my server (EC2 running Centos 7) then the server uploads the file to S3)****