status-go/protocol/communities_key_distributor.go

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package protocol
import (
"context"
"crypto/ecdsa"
"github.com/status-im/status-go/protocol/common"
"github.com/status-im/status-go/protocol/communities"
"github.com/status-im/status-go/protocol/encryption"
"github.com/status-im/status-go/protocol/protobuf"
)
type CommunitiesKeyDistributor interface {
Distribute(community *communities.Community, keyActions *communities.EncryptionKeyActions) error
Rekey(community *communities.Community) error
}
type CommunitiesKeyDistributorImpl struct {
sender *common.MessageSender
encryptor *encryption.Protocol
}
func (ckd *CommunitiesKeyDistributorImpl) Distribute(community *communities.Community, keyActions *communities.EncryptionKeyActions) error {
if !community.IsControlNode() {
return communities.ErrNotControlNode
}
err := ckd.distributeKey(community, community.ID(), &keyActions.CommunityKeyAction)
if err != nil {
return err
}
for channelID := range keyActions.ChannelKeysActions {
keyAction := keyActions.ChannelKeysActions[channelID]
err := ckd.distributeKey(community, []byte(community.IDString()+channelID), &keyAction)
if err != nil {
return err
}
}
return nil
}
func (ckd *CommunitiesKeyDistributorImpl) Rekey(community *communities.Community) error {
if !community.IsControlNode() {
return communities.ErrNotControlNode
}
err := ckd.distributeKey(community, community.ID(), &communities.EncryptionKeyAction{
ActionType: communities.EncryptionKeyRekey,
Members: community.Members(),
})
if err != nil {
return err
}
for channelID, channel := range community.Chats() {
err := ckd.distributeKey(community, []byte(community.IDString()+channelID), &communities.EncryptionKeyAction{
ActionType: communities.EncryptionKeyRekey,
Members: channel.Members,
})
if err != nil {
return err
}
}
return nil
}
func (ckd *CommunitiesKeyDistributorImpl) distributeKey(community *communities.Community, hashRatchetGroupID []byte, keyAction *communities.EncryptionKeyAction) error {
pubkeys := make([]*ecdsa.PublicKey, len(keyAction.Members))
i := 0
for hex := range keyAction.Members {
pubkeys[i], _ = common.HexToPubkey(hex)
i++
}
switch keyAction.ActionType {
case communities.EncryptionKeyAdd:
_, err := ckd.encryptor.GenerateHashRatchetKey(hashRatchetGroupID)
if err != nil {
return err
}
err = ckd.sendKeyExchangeMessage(community, hashRatchetGroupID, pubkeys, common.KeyExMsgReuse)
if err != nil {
return err
}
case communities.EncryptionKeyRekey:
err := ckd.sendKeyExchangeMessage(community, hashRatchetGroupID, pubkeys, common.KeyExMsgRekey)
if err != nil {
return err
}
case communities.EncryptionKeySendToMembers:
err := ckd.sendKeyExchangeMessage(community, hashRatchetGroupID, pubkeys, common.KeyExMsgReuse)
if err != nil {
return err
}
}
return nil
}
func (ckd *CommunitiesKeyDistributorImpl) sendKeyExchangeMessage(community *communities.Community, hashRatchetGroupID []byte, pubkeys []*ecdsa.PublicKey, msgType common.CommKeyExMsgType) error {
rawMessage := common.RawMessage{
SkipProtocolLayer: false,
CommunityID: community.ID(),
CommunityKeyExMsgType: msgType,
Recipients: pubkeys,
MessageType: protobuf.ApplicationMetadataMessage_CHAT_MESSAGE,
HashRatchetGroupID: hashRatchetGroupID,
PubsubTopic: community.PubsubTopic(), // TODO: confirm if it should be sent in community pubsub topic
}
_, err := ckd.sender.SendCommunityMessage(context.Background(), rawMessage)
if err != nil {
return err
}
return nil
}