status-go/protocol/v1/status_message.go

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package protocol
import (
"crypto/ecdsa"
"encoding/json"
"github.com/golang/protobuf/proto"
"github.com/jinzhu/copier"
"github.com/pkg/errors"
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"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/log"
"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/encryption"
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"github.com/status-im/status-go/protocol/encryption/multidevice"
"github.com/status-im/status-go/protocol/encryption/sharedsecret"
"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:"-"`
// 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"`
// UnwrappedPayload is the payload after having been unwrapped from the applicaition metadata layer
UnwrappedPayload []byte `json:"unwrappedPayload"`
// ID is the canonical ID of the message
ID types.HexBytes `json:"id"`
// Hash is the transport layer hash
Hash []byte `json:"-"`
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// Dst is the targeted public key
Dst *ecdsa.PublicKey
// 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:"-"`
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// Installations is the new installations returned by the encryption layer
Installations []*multidevice.Installation
// SharedSecret is the shared secret returned by the encryption layer
SharedSecrets []*sharedsecret.Secret
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// HashRatchetInfo is the information about a new hash ratchet group/key pair
HashRatchetInfo []*encryption.HashRatchetInfo
}
// 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.UnwrappedPayload),
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
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if shhMessage.Dst != nil {
publicKey, err := crypto.UnmarshalPubkey(shhMessage.Dst)
if err != nil {
return err
}
m.Dst = publicKey
}
return nil
}
func (m *StatusMessage) HandleEncryption(myKey *ecdsa.PrivateKey, senderKey *ecdsa.PublicKey, enc *encryption.Protocol, skipNegotiation bool) 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
// Nothing to do
if skipNegotiation {
return nil
}
var protocolMessage encryption.ProtocolMessage
err := proto.Unmarshal(m.TransportPayload, &protocolMessage)
if err != nil {
return errors.Wrap(err, "failed to unmarshal ProtocolMessage")
}
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response, err := enc.HandleMessage(
myKey,
senderKey,
&protocolMessage,
m.Hash,
)
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if err == encryption.ErrHashRatchetGroupIDNotFound {
if response != nil {
m.HashRatchetInfo = response.HashRatchetInfo
}
return err
}
if err != nil {
return errors.Wrap(err, "failed to handle Encryption message")
}
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m.DecryptedPayload = response.DecryptedMessage
m.Installations = response.Installations
m.SharedSecrets = response.SharedSecrets
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m.HashRatchetInfo = response.HashRatchetInfo
return 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)
log.Debug("calculated ID for envelope", "envelopeHash", hexutil.Encode(m.Hash), "messageId", hexutil.Encode(m.ID))
m.UnwrappedPayload = message.Payload
m.Type = message.Type
return nil
}