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// +build peer_name_hash
package mesh
// Let peer names be SHA256 hashes of anything, provided they are unique.
import (
"crypto/sha256"
"encoding/hex"
)
// PeerName must be globally unique and usable as a map key.
type PeerName string
const (
// PeerNameFlavour is the type of peer names we use.
PeerNameFlavour = "hash"
// NameSize is the number of bytes in a peer name.
NameSize = sha256.Size >> 1
// UnknownPeerName is used as a sentinel value.
UnknownPeerName = PeerName("")
)
// PeerNameFromUserInput parses PeerName from a user-provided string.
func PeerNameFromUserInput(userInput string) (PeerName, error) {
// fixed-length identity
nameByteAry := sha256.Sum256([]byte(userInput))
return PeerNameFromBin(nameByteAry[:NameSize]), nil
}
// PeerNameFromString parses PeerName from a generic string.
func PeerNameFromString(nameStr string) (PeerName, error) {
if _, err := hex.DecodeString(nameStr); err != nil {
return UnknownPeerName, err
}
return PeerName(nameStr), nil
}
// PeerNameFromBin parses PeerName from a byte slice.
func PeerNameFromBin(nameByte []byte) PeerName {
return PeerName(hex.EncodeToString(nameByte))
}
// Bin encodes PeerName as a byte slice.
func (name PeerName) Bin() []byte {
res, err := hex.DecodeString(string(name))
checkFatal(err)
return res
}
// String encodes PeerName as a string.
func (name PeerName) String() string {
return string(name)
}
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