status-go/wakuv2/persistence/signed_messages.go

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package persistence
import (
"crypto/ecdsa"
"database/sql"
"errors"
"go.uber.org/zap"
"github.com/ethereum/go-ethereum/crypto"
)
// DBStore is a MessageProvider that has a *sql.DB connection
type ProtectedTopicsStore struct {
db *sql.DB
log *zap.Logger
insertStmt *sql.Stmt
fetchPrivKeyStmt *sql.Stmt
deleteStmt *sql.Stmt
}
// Creates a new DB store using the db specified via options.
// It will create a messages table if it does not exist and
// clean up records according to the retention policy used
func NewProtectedTopicsStore(log *zap.Logger, db *sql.DB) (*ProtectedTopicsStore, error) {
insertStmt, err := db.Prepare("INSERT OR REPLACE INTO pubsubtopic_signing_key (topic, priv_key, pub_key) VALUES (?, ?, ?)")
if err != nil {
return nil, err
}
fetchPrivKeyStmt, err := db.Prepare("SELECT priv_key FROM pubsubtopic_signing_key WHERE topic = ?")
if err != nil {
return nil, err
}
deleteStmt, err := db.Prepare("DELETE FROM pubsubtopic_signing_key WHERE topic = ?")
if err != nil {
return nil, err
}
result := new(ProtectedTopicsStore)
result.log = log.Named("protected-topics-store")
result.db = db
result.insertStmt = insertStmt
result.fetchPrivKeyStmt = fetchPrivKeyStmt
result.deleteStmt = deleteStmt
return result, nil
}
func (p *ProtectedTopicsStore) Close() error {
err := p.insertStmt.Close()
if err != nil {
return err
}
return p.fetchPrivKeyStmt.Close()
}
func (p *ProtectedTopicsStore) Insert(pubsubTopic string, privKey *ecdsa.PrivateKey, publicKey *ecdsa.PublicKey) error {
var privKeyBytes []byte
if privKey != nil {
privKeyBytes = crypto.FromECDSA(privKey)
}
pubKeyBytes := crypto.FromECDSAPub(publicKey)
_, err := p.insertStmt.Exec(pubsubTopic, privKeyBytes, pubKeyBytes)
return err
}
func (p *ProtectedTopicsStore) Delete(pubsubTopic string) error {
_, err := p.deleteStmt.Exec(pubsubTopic)
return err
}
func (p *ProtectedTopicsStore) FetchPrivateKey(topic string) (privKey *ecdsa.PrivateKey, err error) {
var privKeyBytes []byte
err = p.fetchPrivKeyStmt.QueryRow(topic).Scan(&privKeyBytes)
if err != nil {
if errors.Is(err, sql.ErrNoRows) {
return nil, nil
}
return nil, err
}
return crypto.ToECDSA(privKeyBytes)
}
type ProtectedTopic struct {
PubKey *ecdsa.PublicKey
Topic string
}
func (p *ProtectedTopicsStore) ProtectedTopics() ([]ProtectedTopic, error) {
rows, err := p.db.Query("SELECT pub_key, topic FROM pubsubtopic_signing_key")
if err != nil {
return nil, err
}
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defer rows.Close()
var result []ProtectedTopic
for rows.Next() {
var pubKeyBytes []byte
var topic string
err := rows.Scan(&pubKeyBytes, &topic)
if err != nil {
return nil, err
}
pubk, err := crypto.UnmarshalPubkey(pubKeyBytes)
if err != nil {
return nil, err
}
result = append(result, ProtectedTopic{
PubKey: pubk,
Topic: topic,
})
}
return result, nil
}