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