// Handle Pubkey, Message, and Purge Registration
func register(config *api.ApiConfig) {
var message objects.Message
var txid [16]byte
for {
select {
case pubHash := <-config.PubkeyRegister:
// Check if pubkey is in database...
pubkey := checkPubkey(config, pubHash)
if pubkey == nil {
break
}
outbox := localdb.GetBox(localdb.OUTBOX)
for _, metamsg := range outbox {
recvHash := objects.MakeHash([]byte(metamsg.Recipient))
if string(pubHash.GetBytes()) == string(recvHash.GetBytes()) {
// Send message and move to sendbox
msg, err := localdb.GetMessageDetail(metamsg.TxidHash)
if err != nil {
config.Log <- err.Error()
break
}
msg.Encrypted = encryption.Encrypt(config.Log, pubkey, string(msg.Decrypted.GetBytes()))
msg.MetaMessage.Timestamp = time.Now().Round(time.Second)
err = localdb.AddUpdateMessage(msg, localdb.SENDBOX)
if err != nil {
config.Log <- err.Error()
break
}
sendMsg := new(objects.Message)
sendMsg.Timestamp = msg.MetaMessage.Timestamp
sendMsg.TxidHash = msg.MetaMessage.TxidHash
sendMsg.AddrHash = recvHash
sendMsg.Content = *msg.Encrypted
config.RecvQueue <- *objects.MakeFrame(objects.MSG, objects.BROADCAST, sendMsg)
}
}
case message = <-config.MessageRegister:
// If address is registered, store message in inbox
detail, err := localdb.GetAddressDetail(message.AddrHash)
if err != nil {
config.Log <- "Message address not in database..."
break
}
if !detail.IsRegistered {
config.Log <- "Message not for registered address..."
break
}
config.Log <- "Registering new encrypted message..."
msg := new(objects.FullMessage)
msg.MetaMessage.TxidHash = message.TxidHash
msg.MetaMessage.Timestamp = message.Timestamp
msg.MetaMessage.Recipient = detail.String
msg.Encrypted = &message.Content
err = localdb.AddUpdateMessage(msg, localdb.INBOX)
if err != nil {
config.Log <- err.Error()
}
case message = <-config.PubRegister:
// If address is registered, store message in inbox
detail, err := localdb.GetAddressDetail(message.AddrHash)
if err != nil {
config.Log <- "Message address not in database..."
break
}
if !detail.IsSubscribed {
config.Log <- "Not Subscribed to Address..."
break
}
config.Log <- "Registering new publication..."
msg := new(objects.FullMessage)
msg.MetaMessage.TxidHash = message.TxidHash
msg.MetaMessage.Timestamp = message.Timestamp
msg.MetaMessage.Sender = detail.String
msg.MetaMessage.Recipient = "<Subscription Message>"
msg.Encrypted = &message.Content
msg.Decrypted = new(objects.DecryptedMessage)
msg.Decrypted.FromBytes(encryption.DecryptPub(config.Log, detail.Pubkey, msg.Encrypted))
err = localdb.AddUpdateMessage(msg, localdb.INBOX)
if err != nil {
config.Log <- err.Error()
}
case txid = <-config.PurgeRegister:
// If Message in database, mark as purged
detail, err := localdb.GetMessageDetail(objects.MakeHash(txid[:]))
if err != nil {
break
}
detail.MetaMessage.Purged = true
err = localdb.AddUpdateMessage(detail, -1)
if err != nil {
config.Log <- fmt.Sprintf("Error registering purge: %s", err)
}
} // End select
} // End for
} // End register
func (service *EMPService) PublishMessage(r *http.Request, args *SendMsg, reply *SendResponse) error {
if !basicAuth(service.Config, r) {
service.Config.Log <- fmt.Sprintf("Unauthorized RPC Request from: %s", r.RemoteAddr)
return errors.New("Unauthorized")
}
// Nil Check
if len(args.Sender) == 0 || len(args.Plaintext) == 0 {
return errors.New("All fields required.")
}
var err error
// Get Addresses
sendAddr := encryption.StringToAddress(args.Sender)
if len(sendAddr) == 0 {
return errors.New("Invalid sender address!")
}
sender, err := localdb.GetAddressDetail(objects.MakeHash(sendAddr))
if err != nil {
return errors.New(fmt.Sprintf("Error pulling send address from Database: %s", err))
}
if sender.Privkey == nil {
return errors.New("Private Key Required to Publish Message")
}
// Create New Message
msg := new(objects.FullMessage)
msg.Decrypted = new(objects.DecryptedMessage)
msg.Encrypted = nil
txid := make([]byte, len(msg.Decrypted.Txid), cap(msg.Decrypted.Txid))
// Fill out decrypted message
n, err := rand.Read(txid)
if n < len(msg.Decrypted.Txid[:]) || err != nil {
return errors.New(fmt.Sprintf("Problem with random reader: %s", err))
}
copy(msg.Decrypted.Pubkey[:], sender.Pubkey)
msg.Decrypted.Subject = args.Subject
msg.Decrypted.MimeType = "text/plain"
msg.Decrypted.Content = args.Plaintext
msg.Decrypted.Length = uint32(len(msg.Decrypted.Content))
// Fill Out Meta Message (save timestamp)
msg.MetaMessage.Purged = false
msg.MetaMessage.TxidHash = objects.MakeHash(txid)
msg.MetaMessage.Sender = sender.String
msg.MetaMessage.Recipient = "<Subscription Message>"
// Get Signature
priv := new(ecdsa.PrivateKey)
priv.PublicKey.Curve = encryption.GetCurve()
priv.D = new(big.Int)
priv.D.SetBytes(sender.Privkey)
sign := msg.Decrypted.GetBytes()
sign = sign[:len(sign)-65]
signHash := objects.MakeHash(sign)
x, y, err := ecdsa.Sign(rand.Reader, priv, signHash.GetBytes())
if err != nil {
return err
}
copy(msg.Decrypted.Signature[:], encryption.MarshalPubkey(x, y))
// Send message and add to sendbox...
msg.Encrypted = encryption.EncryptPub(service.Config.Log, sender.Privkey, string(msg.Decrypted.GetBytes()))
msg.MetaMessage.Timestamp = time.Now().Round(time.Second)
// Now Add Txid
copy(msg.Decrypted.Txid[:], txid)
err = localdb.AddUpdateMessage(msg, localdb.SENDBOX)
if err != nil {
return err
}
sendMsg := new(objects.Message)
sendMsg.TxidHash = msg.MetaMessage.TxidHash
sendMsg.AddrHash = objects.MakeHash(sender.Address)
sendMsg.Timestamp = msg.MetaMessage.Timestamp
sendMsg.Content = *msg.Encrypted
service.Config.RecvQueue <- *objects.MakeFrame(objects.PUB, objects.BROADCAST, sendMsg)
reply.IsSent = true
// Finish by setting msg's txid
reply.TxidHash = msg.MetaMessage.TxidHash.GetBytes()
return nil
}