which can be used like:
```
// Cat is used to get cat an ipfs object
func (im *IpfsManager) Cat(cid string) ([]byte, error) {
	var (
		r   io.ReadCloser
		err error
	)
	r, err = im.shell.Cat(cid)
	if err != nil {
		return nil, err
	}
	defer r.Close()
	return ioutil.ReadAll(r)
}
```

`im.shell` is `ipfsapi.Shell`, you can use it to get the bytes of the file and then in your use case write them to S3