go-waku/waku/rln-credentials.go

97 lines
2.8 KiB
Go
Raw Normal View History

2022-08-09 00:02:08 +00:00
package waku
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/common"
"github.com/status-im/go-rln/rln"
)
type membershipCredentials struct {
Keypair rln.MembershipKeyPair `json:"keypair"`
Index rln.MembershipIndex `json:"index"`
}
func writeRLNMembershipCredentialsToFile(keyPair rln.MembershipKeyPair, idx rln.MembershipIndex, path string, passwd []byte, overwrite bool) error {
if err := checkForFileExistence(path, overwrite); err != nil {
return err
}
credentialsJSON, err := json.Marshal(membershipCredentials{
Keypair: keyPair,
Index: idx,
})
if err != nil {
return err
}
encryptedCredentials, err := keystore.EncryptDataV3(credentialsJSON, passwd, keystore.StandardScryptN, keystore.StandardScryptP)
if err != nil {
return err
}
output, err := json.Marshal(encryptedCredentials)
if err != nil {
return err
}
return ioutil.WriteFile(path, output, 0600)
}
func loadMembershipCredentialsFromFile(path string, passwd string) (rln.MembershipKeyPair, rln.MembershipIndex, error) {
src, err := ioutil.ReadFile(path)
if err != nil {
return rln.MembershipKeyPair{}, rln.MembershipIndex(0), err
}
var encryptedK keystore.CryptoJSON
err = json.Unmarshal(src, &encryptedK)
if err != nil {
return rln.MembershipKeyPair{}, rln.MembershipIndex(0), err
}
credentialsBytes, err := keystore.DecryptDataV3(encryptedK, passwd)
if err != nil {
return rln.MembershipKeyPair{}, rln.MembershipIndex(0), err
}
var credentials membershipCredentials
err = json.Unmarshal(credentialsBytes, &credentials)
if err != nil {
return rln.MembershipKeyPair{}, rln.MembershipIndex(0), err
}
return credentials.Keypair, credentials.Index, err
}
func getMembershipCredentials(options Options) (fromFile bool, idKey *rln.IDKey, idCommitment *rln.IDCommitment, index rln.MembershipIndex, err error) {
if _, err = os.Stat(options.RLNRelay.CredentialsFile); err == nil {
if keyPair, index, err := loadMembershipCredentialsFromFile(options.RLNRelay.CredentialsFile, options.KeyPasswd); err != nil {
return false, nil, nil, rln.MembershipIndex(0), fmt.Errorf("could not read membership credentials file: %w", err)
} else {
return true, &keyPair.IDKey, &keyPair.IDCommitment, index, nil
}
}
if os.IsNotExist(err) {
if options.RLNRelay.IDKey != "" {
idKey = new(rln.IDKey)
copy((*idKey)[:], common.FromHex(options.RLNRelay.IDKey))
}
if options.RLNRelay.IDCommitment != "" {
idCommitment = new(rln.IDCommitment)
copy((*idCommitment)[:], common.FromHex(options.RLNRelay.IDCommitment))
}
return false, idKey, idCommitment, rln.MembershipIndex(options.RLNRelay.MembershipIndex), nil
}
return false, nil, nil, rln.MembershipIndex(0), fmt.Errorf("could not read membership credentials file: %w", err)
}