A User is able to register and login to the server.

Every user is able to upload and download the files.

File uploaded is transferred to the server along with all the details like owner,name,size,type.

Uploader is able to tell how many times the given file can be downloaded. After that file is downloaded the mentioned number of times it is deleted from the server.

Every uploaded file has a code (key) generated which will be shared.

Every user is able to download file from the server with the code given to him.

Uploader can set the time for which the file is available for download, after that time passes the file is deleted from the server.

Uploader can revoke a file using its identifier. If he does so then that file identifier can't be used to download a file anymore or file gets deleted from the server.