// MsgRead creates a Bitmessage object from an unencrypted wire.MsgMsg.
func MsgRead(msg *cipher.Message, toAddress string, ofChan bool) (*Bmail, error) {
data := msg.Bitmessage()
object := msg.Object()
header := object.Header()
sign, _ := data.SigningKey.ToBtcec()
encr, _ := data.EncryptionKey.ToBtcec()
from := identity.NewPublic(sign, encr, data.Pow, data.FromAddressVersion, data.FromStreamNumber)
fromAddress, err := from.Address.Encode()
if err != nil {
return nil, err
}
return &Bmail{
From: bmToEmail(fromAddress),
To: bmToEmail(toAddress),
Expiration: header.Expiration(),
Ack: msg.Ack(),
OfChannel: ofChan,
Content: data.Content,
object: object.MsgObject(),
}, nil
}
// newMessage is called when a new message is received by the RPC client.
// Messages are guaranteed to be received in ascending order of counter value.
func (s *server) newMessage(counter uint64, object []byte) {
// Store counter value.
atomic.StoreUint64(&s.msgCounter, counter)
msg := &obj.Message{}
err := msg.Decode(bytes.NewReader(object))
if err != nil {
serverLog.Errorf("Failed to decode message #%d from bytes: %v", counter,
err)
return // Ignore message.
}
// Check if message is smaller than expected.
// IV + Curve params/X/Y + 1 block + HMAC-256
if len(msg.Encrypted) <= aes.BlockSize+70+aes.BlockSize+sha256.Size {
return
}
// Is this an ack message we are expecting?
for _, user := range s.imapUser {
err = user.DeliverAckReply(object)
if err == nil {
return
}
}
// Contains the address of the identity used to decrypt the message.
var address string
// Whether the message was received from a channel.
var ofChan bool
var id uint32
var message *cipher.Message
// Try decrypting with all available identities.
for uid, user := range s.users {
err = user.Keys.ForEach(func(id *keymgr.PrivateID) error {
var decryptErr error
message, decryptErr = cipher.TryDecryptAndVerifyMessage(msg, &id.Private)
if decryptErr == nil {
address = id.Address()
ofChan = id.IsChan
//id = uid
return errSuccessCode
}
return nil
})
if err != nil {
id = uid
// Decryption successful.
break
}
}
if message == nil {
// Decryption unsuccessful.
return
}
// Decryption was successful. Add message to store.
// TODO Store public key of the sender in bmagent
// Read message.
bmsg, err := email.MsgRead(message, address, ofChan)
if err != nil {
log.Errorf("Failed to decode message #%d: %v", counter, err)
return
}
rpccLog.Trace("Bitmessage received from " + bmsg.From + " to " + bmsg.To)
err = s.imapUser[id].DeliverFromBMNet(bmsg)
if err != nil {
log.Errorf("Failed to save message #%d: %v", counter, err)
return
}
// Check if length of Ack is correct and message isn't from a channel.
if message.Ack() == nil || len(message.Ack()) < wire.MessageHeaderSize || ofChan {
return
}
// Send out ack if necessary.
ack := message.Ack()[wire.MessageHeaderSize:]
err = (&wire.MsgObject{}).Decode(bytes.NewReader(ack))
if err != nil { // Can't send invalid Ack.
return
}
_, err = s.bmd.SendObject(ack)
if err != nil {
log.Infof("Failed to send ack for message #%d: %v", counter, err)
return
}
}
