// VulcanizeDB
// Copyright © 2019 Vulcanize

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.

// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package ipfseth

import (
	"github.com/ipfs/go-ipfs-blockstore"
	"github.com/ipfs/go-ipfs-ds-help"

	"github.com/multiformats/go-multihash"
)

// MultihashKeyFromKeccak256 converts keccak256 hash bytes into a blockstore-prefixed multihash db key string
func MultihashKeyFromKeccak256(b []byte) (string, error) {
	mh, err := multihash.Encode(b, multihash.KECCAK_256)
	if err != nil {
		return "", err
	}
	dbKey := dshelp.MultihashToDsKey(mh)
	return blockstore.BlockPrefix.String() + dbKey.String(), nil
}