forked from cerc-io/ipfs-ethdb
65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
// VulcanizeDB
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// Copyright © 2020 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package pgipfsethdb
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import "bytes"
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type KeyType uint
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const (
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Invalid KeyType = iota
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Keccak
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Prefixed
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Suffixed
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Header
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Preimage
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)
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var (
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// keyDelineation is used to delineate the key prefixes and suffixes
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KeyDelineation = []byte("/")
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// numberDelineation is used to delineate the block number encoded in a key
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NumberDelineation = []byte(":")
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// Data item prefixes (use single byte to avoid mixing data types, avoid `i`, used for indexes).
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HeaderPrefix = []byte("h") // headerPrefix + num (uint64 big endian) + hash -> header
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PreimagePrefix = []byte("secure-key-") // preimagePrefix + hash -> preimage
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)
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// ResolveKeyType returns the key type based on the prefix
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func ResolveKeyType(key []byte) (KeyType, [][]byte) {
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sk := bytes.Split(key, KeyDelineation)
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switch len(sk) {
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case 1:
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return Keccak, sk
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case 2:
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switch prefix := sk[0]; {
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case bytes.Equal(prefix, HeaderPrefix):
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return Header, bytes.Split(sk[1], NumberDelineation)
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case bytes.Equal(prefix, PreimagePrefix):
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return Preimage, sk
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default:
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return Prefixed, sk
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}
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case 3:
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return Suffixed, sk
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}
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return Invalid, sk
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}
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