upload file directly to S3 without need to use forms

for my rails application, I download a bunch of files from a remote url to my application. Then I would like to directly upload them to amazon s3, without needing a form to do the upload, since I will temporarily cache the file I downloaded on the ec2 instance. I would also like to retain the link to the files i uploaded so I can download them later.

So I am essentially reposting the files I downloaded.

I looked around, but most of the solution seem to involve form uploading to s3 with a user.

is there s direct upload solution?