Secure file uploads with redux-plupload, ClamAV and S3

We have recently added a new feature that allows a user to upload a file from our webpage. We implemented this using redux-plupload, ClamAV and S3 to satisfy the following requirements: the file should be uploaded from the client to avoid excessive memory use on the server while streaming files. the upload must be secure and the file must be stored securely (and ideally encrypted at rest). the file should be virus free so that it can be downloaded without worry.