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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Contains the Whisper protocol Topic element.
package whisperv5
import (
"encoding/json"
"fmt"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
)
// Topic represents a cryptographically secure, probabilistic partial
// classifications of a message, determined as the first (left) 4 bytes of the
// SHA3 hash of some arbitrary data given by the original author of the message.
type TopicType [TopicLength]byte
func BytesToTopic(b []byte) (t TopicType) {
sz := TopicLength
if x := len(b); x < TopicLength {
sz = x
}
for i := 0; i < sz; i++ {
t[i] = b[i]
}
return t
}
// String converts a topic byte array to a string representation.
func (topic *TopicType) String() string {
return string(common.ToHex(topic[:]))
}
func (t *TopicType) MarshalJSON() ([]byte, error) {
return json.Marshal(hexutil.Bytes(t[:]))
}
// UnmarshalJSON parses a hex representation to a topic.
func (t *TopicType) UnmarshalJSON(input []byte) error {
var data hexutil.Bytes
if err := json.Unmarshal(input, &data); err != nil {
return err
}
if len(data) != TopicLength {
return fmt.Errorf("unmarshalJSON failed: topic must be exactly %d bytes(%d)", TopicLength, len(input))
}
*t = BytesToTopic(data)
return nil
}
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