offline ipfs multihash verification

ipfs.go

func CoreHashOnly(path Path) (string, error) {
	node, err := core.NewNode(context.TODO(), &core.BuildCfg{Online: false}) // NilRepo: true})
	if err != nil {

		return "", err
	}
	fd, err := os.Open(path.String())
	if err != nil {
		return "", err
	}
	defer fd.Close()
	adder, err := coreunix.NewAdder(context.TODO(), node.Pinning, node.Blockstore, node.DAG)
	if err != nil {

		return "", err
	}
	file := files.NewReaderFile(fd)
	if err != nil {
		return "", err
	}
	fn, err := adder.AddAllAndPin(file)
	if err != nil {
		return "", err
	}
	return fn.Cid().String(), nil
}