可以为AWS Javascript SDK为每个用户创建IAM对象吗？

I'm working on S3 files uploader. Users can login to my web app and upload files to their own bucket. I don't want to use third party authentication services (like FB, G+ etc), because user is already authenticated. So, it is ok to create IAM object per user and hard-code AWS KEY nad AWS SECRET KEY in the html?I'm working on S3 files uploader. Users can log