status-go/protocol/v1/status_message.go

188 lines
5.4 KiB
Go

package protocol
import (
"crypto/ecdsa"
"encoding/json"
"log"
"github.com/golang/protobuf/proto"
"github.com/jinzhu/copier"
"github.com/pkg/errors"
"github.com/status-im/status-go/eth-node/crypto"
"github.com/status-im/status-go/eth-node/types"
"github.com/status-im/status-go/protocol/datasync"
"github.com/status-im/status-go/protocol/encryption"
"github.com/status-im/status-go/protocol/protobuf"
)
type StatusMessageT int
// StatusMessage is any Status Protocol message.
type StatusMessage struct {
// TransportMessage is the parsed message received from the transport layer, i.e the input
TransportMessage *types.Message `json:"transportMessage"`
// Type is the type of application message contained
Type protobuf.ApplicationMetadataMessage_Type `json:"-"`
// ParsedMessage is the parsed message by the application layer, i.e the output
ParsedMessage interface{} `json:"-"`
// TransportPayload is the payload as received from the transport layer
TransportPayload []byte `json:"-"`
// DecryptedPayload is the payload after having been processed by the encryption layer
DecryptedPayload []byte `json:"decryptedPayload"`
// ID is the canonical ID of the message
ID types.HexBytes `json:"id"`
// Hash is the transport layer hash
Hash []byte `json:"-"`
// TransportLayerSigPubKey contains the public key provided by the transport layer
TransportLayerSigPubKey *ecdsa.PublicKey `json:"-"`
// ApplicationMetadataLayerPubKey contains the public key provided by the application metadata layer
ApplicationMetadataLayerSigPubKey *ecdsa.PublicKey `json:"-"`
}
// Temporary JSON marshaling for those messages that are not yet processed
// by the go code
func (m *StatusMessage) MarshalJSON() ([]byte, error) {
item := struct {
ID types.HexBytes `json:"id"`
Payload string `json:"payload"`
From types.HexBytes `json:"from"`
Timestamp uint32 `json:"timestamp"`
}{
ID: m.ID,
Payload: string(m.DecryptedPayload),
Timestamp: m.TransportMessage.Timestamp,
From: m.TransportMessage.Sig,
}
return json.Marshal(item)
}
// SigPubKey returns the most important signature, from the application layer to transport
func (m *StatusMessage) SigPubKey() *ecdsa.PublicKey {
if m.ApplicationMetadataLayerSigPubKey != nil {
return m.ApplicationMetadataLayerSigPubKey
}
return m.TransportLayerSigPubKey
}
func (m *StatusMessage) Clone() (*StatusMessage, error) {
copy := &StatusMessage{}
err := copier.Copy(&copy, m)
return copy, err
}
func (m *StatusMessage) HandleTransport(shhMessage *types.Message) error {
publicKey, err := crypto.UnmarshalPubkey(shhMessage.Sig)
if err != nil {
return errors.Wrap(err, "failed to get signature")
}
m.TransportMessage = shhMessage
m.Hash = shhMessage.Hash
m.TransportLayerSigPubKey = publicKey
m.TransportPayload = shhMessage.Payload
return nil
}
func (m *StatusMessage) HandleEncryption(myKey *ecdsa.PrivateKey, senderKey *ecdsa.PublicKey, enc *encryption.Protocol) error {
// As we handle non-encrypted messages, we make sure that DecryptPayload
// is set regardless of whether this step is successful
m.DecryptedPayload = m.TransportPayload
var protocolMessage encryption.ProtocolMessage
err := proto.Unmarshal(m.TransportPayload, &protocolMessage)
if err != nil {
return errors.Wrap(err, "failed to unmarshal ProtocolMessage")
}
payload, err := enc.HandleMessage(
myKey,
senderKey,
&protocolMessage,
m.Hash,
)
if err != nil {
return errors.Wrap(err, "failed to handle Encryption message")
}
m.DecryptedPayload = payload
return nil
}
// HandleDatasync processes StatusMessage through data sync layer.
// This is optional and DataSync might be nil. In such a case,
// only one payload will be returned equal to DecryptedPayload.
func (m *StatusMessage) HandleDatasync(datasync *datasync.DataSync) ([]*StatusMessage, error) {
var statusMessages []*StatusMessage
payloads := datasync.Handle(
m.SigPubKey(),
m.DecryptedPayload,
)
for _, payload := range payloads {
message, err := m.Clone()
if err != nil {
return nil, err
}
message.DecryptedPayload = payload
statusMessages = append(statusMessages, message)
}
return statusMessages, nil
}
func (m *StatusMessage) HandleApplicationMetadata() error {
message, err := protobuf.Unmarshal(m.DecryptedPayload)
if err != nil {
return err
}
recoveredKey, err := message.RecoverKey()
if err != nil {
return err
}
m.ApplicationMetadataLayerSigPubKey = recoveredKey
// Calculate ID using the wrapped record
m.ID = MessageID(recoveredKey, m.DecryptedPayload)
m.DecryptedPayload = message.Payload
m.Type = message.Type
return nil
}
func (m *StatusMessage) HandleApplication() error {
switch m.Type {
case protobuf.ApplicationMetadataMessage_CHAT_MESSAGE:
var message protobuf.ChatMessage
err := proto.Unmarshal(m.DecryptedPayload, &message)
if err != nil {
m.ParsedMessage = nil
log.Printf("[message::DecodeMessage] could not decode ChatMessage: %#x, err: %v", m.Hash, err.Error())
} else {
m.ParsedMessage = message
return nil
}
case protobuf.ApplicationMetadataMessage_MEMBERSHIP_UPDATE_MESSAGE:
var message protobuf.MembershipUpdateMessage
err := proto.Unmarshal(m.DecryptedPayload, &message)
if err != nil {
m.ParsedMessage = nil
log.Printf("[message::DecodeMessage] could not decode MembershipUpdateMessage: %#x, err: %v", m.Hash, err.Error())
} else {
m.ParsedMessage = message
return nil
}
}
return nil
}