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feat: introduce CommunitiesKeyDistributor
This component decouples key distribution from the Messenger, enhancing code maintainability, extensibility and testability. It also alleviates the need to impact all methods potentially affecting encryption keys. Moreover, it allows key distribution inspection for integration tests. part of: status-im/status-desktop#10998
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,120 @@ | ||
| 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.IsOwner() { | ||
| return communities.ErrNotOwner | ||
| } | ||
|
|
||
| err := ckd.distributeKey(community.ID(), community.ID(), &keyActions.CommunityKeyAction) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| for chatID := range keyActions.ChannelKeysActions { | ||
| keyAction := keyActions.ChannelKeysActions[chatID] | ||
| err := ckd.distributeKey(community.ID(), []byte(chatID), &keyAction) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (ckd *CommunitiesKeyDistributorImpl) Rekey(community *communities.Community) error { | ||
| if !community.IsOwner() { | ||
| return communities.ErrNotOwner | ||
| } | ||
|
|
||
| err := ckd.distributeKey(community.ID(), 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.ID(), []byte(community.IDString()+channelID), &communities.EncryptionKeyAction{ | ||
| ActionType: communities.EncryptionKeyRekey, | ||
| Members: channel.Members, | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (ckd *CommunitiesKeyDistributorImpl) distributeKey(communityID, 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(communityID, hashRatchetGroupID, pubkeys, common.KeyExMsgReuse) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| case communities.EncryptionKeyRekey: | ||
| err := ckd.sendKeyExchangeMessage(communityID, hashRatchetGroupID, pubkeys, common.KeyExMsgRekey) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| case communities.EncryptionKeySendToMembers: | ||
| err := ckd.sendKeyExchangeMessage(communityID, hashRatchetGroupID, pubkeys, common.KeyExMsgReuse) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (ckd *CommunitiesKeyDistributorImpl) sendKeyExchangeMessage(communityID, hashRatchetGroupID []byte, pubkeys []*ecdsa.PublicKey, msgType common.CommKeyExMsgType) error { | ||
| rawMessage := common.RawMessage{ | ||
| SkipProtocolLayer: false, | ||
| CommunityID: communityID, | ||
| CommunityKeyExMsgType: msgType, | ||
| Recipients: pubkeys, | ||
| MessageType: protobuf.ApplicationMetadataMessage_CHAT_MESSAGE, | ||
| } | ||
| _, err := ckd.sender.SendCommunityMessage(context.Background(), rawMessage) | ||
|
|
||
| if err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } |
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