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Protocol.hs
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Protocol.hs
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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE OverloadedLists #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE PatternSynonyms #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE TupleSections #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE UndecidableInstances #-}
{-# OPTIONS_GHC -fno-warn-unticked-promoted-constructors #-}
-- |
-- Module : Simplex.Messaging.Agent.Protocol
-- Copyright : (c) simplex.chat
-- License : AGPL-3
--
-- Maintainer : chat@simplex.chat
-- Stability : experimental
-- Portability : non-portable
--
-- Types, parsers, serializers and functions to send and receive SMP agent protocol commands and responses.
--
-- See https://github.com/simplex-chat/simplexmq/blob/master/protocol/agent-protocol.md
module Simplex.Messaging.Agent.Protocol
( -- * Protocol parameters
supportedSMPAgentVRange,
e2eEncConnInfoLength,
e2eEncUserMsgLength,
-- * SMP agent protocol types
ConnInfo,
ACommand (..),
APartyCmd (..),
ACommandTag (..),
aCommandTag,
aPartyCmdTag,
ACmd (..),
APartyCmdTag (..),
ACmdTag (..),
AParty (..),
AEntity (..),
SAParty (..),
SAEntity (..),
APartyI (..),
AEntityI (..),
MsgHash,
MsgMeta (..),
ConnectionStats (..),
SwitchPhase (..),
QueueDirection (..),
SMPConfirmation (..),
AgentMsgEnvelope (..),
AgentMessage (..),
AgentMessageType (..),
APrivHeader (..),
AMessage (..),
SndQAddr,
SMPServer,
pattern SMPServer,
pattern ProtoServerWithAuth,
SMPServerWithAuth,
SrvLoc (..),
SMPQueue (..),
sameQAddress,
noAuthSrv,
SMPQueueUri (..),
SMPQueueInfo (..),
SMPQueueAddress (..),
ConnectionMode (..),
SConnectionMode (..),
AConnectionMode (..),
cmInvitation,
cmContact,
ConnectionModeI (..),
ConnectionRequestUri (..),
AConnectionRequestUri (..),
ConnReqUriData (..),
CRClientData,
ConnReqScheme (..),
simplexChat,
AgentErrorType (..),
CommandErrorType (..),
ConnectionErrorType (..),
BrokerErrorType (..),
SMPAgentError (..),
AgentCryptoError (..),
ATransmission,
ATransmissionOrError,
ARawTransmission,
ConnId,
RcvFileId,
SndFileId,
ConfirmationId,
InvitationId,
MsgIntegrity (..),
MsgErrorType (..),
QueueStatus (..),
UserId,
ACorrId,
AgentMsgId,
NotificationsMode (..),
NotificationInfo (..),
-- * Encode/decode
serializeCommand,
connMode,
connMode',
networkCommandP,
dbCommandP,
commandP,
connModeT,
serializeQueueStatus,
queueStatusT,
agentMessageType,
extraSMPServerHosts,
updateSMPServerHosts,
checkParty,
-- * TCP transport functions
tPut,
tGet,
tPutRaw,
tGetRaw,
)
where
import Control.Applicative (optional, (<|>))
import Control.Monad (unless)
import Control.Monad.Except (runExceptT, throwError)
import Control.Monad.IO.Class
import Data.Aeson (FromJSON (..), ToJSON (..))
import qualified Data.Aeson as J
import Data.Attoparsec.ByteString.Char8 (Parser)
import qualified Data.Attoparsec.ByteString.Char8 as A
import Data.ByteString.Base64
import Data.ByteString.Char8 (ByteString)
import qualified Data.ByteString.Char8 as B
import Data.Functor (($>))
import Data.Int (Int64)
import Data.Kind (Type)
import Data.List.NonEmpty (NonEmpty (..))
import qualified Data.List.NonEmpty as L
import Data.Map (Map)
import qualified Data.Map as M
import Data.Maybe (isJust)
import Data.Text (Text)
import qualified Data.Text as T
import Data.Text.Encoding (encodeUtf8)
import Data.Time.Clock (UTCTime)
import Data.Time.Clock.System (SystemTime)
import Data.Time.ISO8601
import Data.Type.Equality
import Data.Typeable ()
import Data.Word (Word32)
import Database.SQLite.Simple.FromField
import Database.SQLite.Simple.ToField
import GHC.Generics (Generic)
import Generic.Random (genericArbitraryU)
import Simplex.FileTransfer.Description
import Simplex.FileTransfer.Protocol (FileParty (..), XFTPErrorType)
import Simplex.Messaging.Agent.QueryString
import qualified Simplex.Messaging.Crypto as C
import Simplex.Messaging.Crypto.Ratchet (E2ERatchetParams, E2ERatchetParamsUri)
import Simplex.Messaging.Encoding
import Simplex.Messaging.Encoding.String
import Simplex.Messaging.Parsers
import Simplex.Messaging.Protocol
( AProtocolType,
EntityId,
ErrorType,
MsgBody,
MsgFlags,
MsgId,
NMsgMeta,
ProtocolServer (..),
SMPServer,
SMPServerWithAuth,
SndPublicVerifyKey,
SrvLoc (..),
legacyEncodeServer,
legacyServerP,
legacyStrEncodeServer,
noAuthSrv,
sameSrvAddr,
pattern ProtoServerWithAuth,
pattern SMPServer,
)
import qualified Simplex.Messaging.Protocol as SMP
import Simplex.Messaging.Transport (Transport (..), TransportError, serializeTransportError, transportErrorP)
import Simplex.Messaging.Transport.Client (TransportHost, TransportHosts_ (..))
import Simplex.Messaging.Util
import Simplex.Messaging.Version
import Test.QuickCheck (Arbitrary (..))
import Text.Read
import UnliftIO.Exception (Exception)
currentSMPAgentVersion :: Version
currentSMPAgentVersion = 2
supportedSMPAgentVRange :: VersionRange
supportedSMPAgentVRange = mkVersionRange 1 currentSMPAgentVersion
-- it is shorter to allow all handshake headers,
-- including E2E (double-ratchet) parameters and
-- signing key of the sender for the server
e2eEncConnInfoLength :: Int
e2eEncConnInfoLength = 14848
e2eEncUserMsgLength :: Int
e2eEncUserMsgLength = 15856
-- | Raw (unparsed) SMP agent protocol transmission.
type ARawTransmission = (ByteString, ByteString, ByteString)
-- | Parsed SMP agent protocol transmission.
type ATransmission p = (ACorrId, EntityId, APartyCmd p)
-- | SMP agent protocol transmission or transmission error.
type ATransmissionOrError p = (ACorrId, EntityId, Either AgentErrorType (APartyCmd p))
type UserId = Int64
type ACorrId = ByteString
-- | SMP agent protocol participants.
data AParty = Agent | Client
deriving (Eq, Show)
-- | Singleton types for SMP agent protocol participants.
data SAParty :: AParty -> Type where
SAgent :: SAParty Agent
SClient :: SAParty Client
deriving instance Show (SAParty p)
deriving instance Eq (SAParty p)
instance TestEquality SAParty where
testEquality SAgent SAgent = Just Refl
testEquality SClient SClient = Just Refl
testEquality _ _ = Nothing
class APartyI (p :: AParty) where sAParty :: SAParty p
instance APartyI Agent where sAParty = SAgent
instance APartyI Client where sAParty = SClient
data AEntity = AEConn | AERcvFile | AESndFile | AENone
deriving (Eq, Show)
data SAEntity :: AEntity -> Type where
SAEConn :: SAEntity AEConn
SAERcvFile :: SAEntity AERcvFile
SAESndFile :: SAEntity AESndFile
SAENone :: SAEntity AENone
deriving instance Show (SAEntity e)
deriving instance Eq (SAEntity e)
instance TestEquality SAEntity where
testEquality SAEConn SAEConn = Just Refl
testEquality SAERcvFile SAERcvFile = Just Refl
testEquality SAESndFile SAESndFile = Just Refl
testEquality SAENone SAENone = Just Refl
testEquality _ _ = Nothing
class AEntityI (e :: AEntity) where sAEntity :: SAEntity e
instance AEntityI AEConn where sAEntity = SAEConn
instance AEntityI AERcvFile where sAEntity = SAERcvFile
instance AEntityI AESndFile where sAEntity = SAESndFile
instance AEntityI AENone where sAEntity = SAENone
data ACmd = forall p e. (APartyI p, AEntityI e) => ACmd (SAParty p) (SAEntity e) (ACommand p e)
deriving instance Show ACmd
data APartyCmd p = forall e. AEntityI e => APC (SAEntity e) (ACommand p e)
instance Eq (APartyCmd p) where
APC e cmd == APC e' cmd' = case testEquality e e' of
Just Refl -> cmd == cmd'
Nothing -> False
deriving instance Show (APartyCmd p)
type ConnInfo = ByteString
-- | Parameterized type for SMP agent protocol commands and responses from all participants.
data ACommand (p :: AParty) (e :: AEntity) where
NEW :: Bool -> AConnectionMode -> ACommand Client AEConn -- response INV
INV :: AConnectionRequestUri -> ACommand Agent AEConn
JOIN :: Bool -> AConnectionRequestUri -> ConnInfo -> ACommand Client AEConn -- response OK
CONF :: ConfirmationId -> [SMPServer] -> ConnInfo -> ACommand Agent AEConn -- ConnInfo is from sender, [SMPServer] will be empty only in v1 handshake
LET :: ConfirmationId -> ConnInfo -> ACommand Client AEConn -- ConnInfo is from client
REQ :: InvitationId -> L.NonEmpty SMPServer -> ConnInfo -> ACommand Agent AEConn -- ConnInfo is from sender
ACPT :: InvitationId -> ConnInfo -> ACommand Client AEConn -- ConnInfo is from client
RJCT :: InvitationId -> ACommand Client AEConn
INFO :: ConnInfo -> ACommand Agent AEConn
CON :: ACommand Agent AEConn -- notification that connection is established
SUB :: ACommand Client AEConn
END :: ACommand Agent AEConn
CONNECT :: AProtocolType -> TransportHost -> ACommand Agent AENone
DISCONNECT :: AProtocolType -> TransportHost -> ACommand Agent AENone
DOWN :: SMPServer -> [ConnId] -> ACommand Agent AENone
UP :: SMPServer -> [ConnId] -> ACommand Agent AENone
SWITCH :: QueueDirection -> SwitchPhase -> ConnectionStats -> ACommand Agent AEConn
SEND :: MsgFlags -> MsgBody -> ACommand Client AEConn
MID :: AgentMsgId -> ACommand Agent AEConn
SENT :: AgentMsgId -> ACommand Agent AEConn
MERR :: AgentMsgId -> AgentErrorType -> ACommand Agent AEConn
MSG :: MsgMeta -> MsgFlags -> MsgBody -> ACommand Agent AEConn
ACK :: AgentMsgId -> ACommand Client AEConn
SWCH :: ACommand Client AEConn
OFF :: ACommand Client AEConn
DEL :: ACommand Client AEConn
DEL_RCVQ :: SMPServer -> SMP.RecipientId -> Maybe AgentErrorType -> ACommand Agent AEConn
DEL_CONN :: ACommand Agent AEConn
DEL_USER :: Int64 -> ACommand Agent AENone
CHK :: ACommand Client AEConn
STAT :: ConnectionStats -> ACommand Agent AEConn
OK :: ACommand Agent AEConn
ERR :: AgentErrorType -> ACommand Agent AEConn
SUSPENDED :: ACommand Agent AENone
-- XFTP commands and responses
RFPROG :: Int64 -> Int64 -> ACommand Agent AERcvFile
RFDONE :: FilePath -> ACommand Agent AERcvFile
RFERR :: AgentErrorType -> ACommand Agent AERcvFile
SFPROG :: Int64 -> Int64 -> ACommand Agent AESndFile
SFDONE :: ValidFileDescription 'FSender -> [ValidFileDescription 'FRecipient] -> ACommand Agent AESndFile
SFERR :: AgentErrorType -> ACommand Agent AESndFile
deriving instance Eq (ACommand p e)
deriving instance Show (ACommand p e)
data ACmdTag = forall p e. (APartyI p, AEntityI e) => ACmdTag (SAParty p) (SAEntity e) (ACommandTag p e)
data APartyCmdTag p = forall e. AEntityI e => APCT (SAEntity e) (ACommandTag p e)
instance Eq (APartyCmdTag p) where
APCT e cmd == APCT e' cmd' = case testEquality e e' of
Just Refl -> cmd == cmd'
Nothing -> False
deriving instance Show (APartyCmdTag p)
data ACommandTag (p :: AParty) (e :: AEntity) where
NEW_ :: ACommandTag Client AEConn
INV_ :: ACommandTag Agent AEConn
JOIN_ :: ACommandTag Client AEConn
CONF_ :: ACommandTag Agent AEConn
LET_ :: ACommandTag Client AEConn
REQ_ :: ACommandTag Agent AEConn
ACPT_ :: ACommandTag Client AEConn
RJCT_ :: ACommandTag Client AEConn
INFO_ :: ACommandTag Agent AEConn
CON_ :: ACommandTag Agent AEConn
SUB_ :: ACommandTag Client AEConn
END_ :: ACommandTag Agent AEConn
CONNECT_ :: ACommandTag Agent AENone
DISCONNECT_ :: ACommandTag Agent AENone
DOWN_ :: ACommandTag Agent AENone
UP_ :: ACommandTag Agent AENone
SWITCH_ :: ACommandTag Agent AEConn
SEND_ :: ACommandTag Client AEConn
MID_ :: ACommandTag Agent AEConn
SENT_ :: ACommandTag Agent AEConn
MERR_ :: ACommandTag Agent AEConn
MSG_ :: ACommandTag Agent AEConn
ACK_ :: ACommandTag Client AEConn
SWCH_ :: ACommandTag Client AEConn
OFF_ :: ACommandTag Client AEConn
DEL_ :: ACommandTag Client AEConn
DEL_RCVQ_ :: ACommandTag Agent AEConn
DEL_CONN_ :: ACommandTag Agent AEConn
DEL_USER_ :: ACommandTag Agent AENone
CHK_ :: ACommandTag Client AEConn
STAT_ :: ACommandTag Agent AEConn
OK_ :: ACommandTag Agent AEConn
ERR_ :: ACommandTag Agent AEConn
SUSPENDED_ :: ACommandTag Agent AENone
-- XFTP commands and responses
RFDONE_ :: ACommandTag Agent AERcvFile
RFPROG_ :: ACommandTag Agent AERcvFile
RFERR_ :: ACommandTag Agent AERcvFile
SFPROG_ :: ACommandTag Agent AESndFile
SFDONE_ :: ACommandTag Agent AESndFile
SFERR_ :: ACommandTag Agent AESndFile
deriving instance Eq (ACommandTag p e)
deriving instance Show (ACommandTag p e)
aPartyCmdTag :: APartyCmd p -> APartyCmdTag p
aPartyCmdTag (APC e cmd) = APCT e $ aCommandTag cmd
aCommandTag :: ACommand p e -> ACommandTag p e
aCommandTag = \case
NEW {} -> NEW_
INV _ -> INV_
JOIN {} -> JOIN_
CONF {} -> CONF_
LET {} -> LET_
REQ {} -> REQ_
ACPT {} -> ACPT_
RJCT _ -> RJCT_
INFO _ -> INFO_
CON -> CON_
SUB -> SUB_
END -> END_
CONNECT {} -> CONNECT_
DISCONNECT {} -> DISCONNECT_
DOWN {} -> DOWN_
UP {} -> UP_
SWITCH {} -> SWITCH_
SEND {} -> SEND_
MID _ -> MID_
SENT _ -> SENT_
MERR {} -> MERR_
MSG {} -> MSG_
ACK _ -> ACK_
SWCH -> SWCH_
OFF -> OFF_
DEL -> DEL_
DEL_RCVQ {} -> DEL_RCVQ_
DEL_CONN -> DEL_CONN_
DEL_USER _ -> DEL_USER_
CHK -> CHK_
STAT _ -> STAT_
OK -> OK_
ERR _ -> ERR_
SUSPENDED -> SUSPENDED_
RFPROG {} -> RFPROG_
RFDONE {} -> RFDONE_
RFERR {} -> RFERR_
SFPROG {} -> SFPROG_
SFDONE {} -> SFDONE_
SFERR {} -> SFERR_
data QueueDirection = QDRcv | QDSnd
deriving (Eq, Show)
instance StrEncoding QueueDirection where
strEncode = \case
QDRcv -> "rcv"
QDSnd -> "snd"
strP =
A.takeTill (== ' ') >>= \case
"rcv" -> pure QDRcv
"snd" -> pure QDSnd
_ -> fail "bad QueueDirection"
instance ToJSON QueueDirection where
toEncoding = strToJEncoding
toJSON = strToJSON
instance FromJSON QueueDirection where
parseJSON = strParseJSON "QueueDirection"
data SwitchPhase = SPStarted | SPConfirmed | SPCompleted
deriving (Eq, Show)
instance StrEncoding SwitchPhase where
strEncode = \case
SPStarted -> "started"
SPConfirmed -> "confirmed"
SPCompleted -> "completed"
strP =
A.takeTill (== ' ') >>= \case
"started" -> pure SPStarted
"confirmed" -> pure SPConfirmed
"completed" -> pure SPCompleted
_ -> fail "bad SwitchPhase"
instance ToJSON SwitchPhase where
toEncoding = strToJEncoding
toJSON = strToJSON
instance FromJSON SwitchPhase where
parseJSON = strParseJSON "SwitchPhase"
data ConnectionStats = ConnectionStats
{ rcvServers :: [SMPServer],
sndServers :: [SMPServer]
}
deriving (Eq, Show, Generic)
instance StrEncoding ConnectionStats where
strEncode ConnectionStats {rcvServers, sndServers} =
"rcv=" <> strEncodeList rcvServers <> " snd=" <> strEncodeList sndServers
strP = do
rcvServers <- "rcv=" *> strListP
sndServers <- " snd=" *> strListP
pure ConnectionStats {rcvServers, sndServers}
instance ToJSON ConnectionStats where toEncoding = J.genericToEncoding J.defaultOptions
data NotificationsMode = NMPeriodic | NMInstant
deriving (Eq, Show)
instance StrEncoding NotificationsMode where
strEncode = \case
NMPeriodic -> "PERIODIC"
NMInstant -> "INSTANT"
strP =
A.takeTill (== ' ') >>= \case
"PERIODIC" -> pure NMPeriodic
"INSTANT" -> pure NMInstant
_ -> fail "bad NotificationsMode"
instance ToJSON NotificationsMode where
toEncoding = strToJEncoding
toJSON = strToJSON
instance ToField NotificationsMode where toField = toField . strEncode
instance FromField NotificationsMode where fromField = blobFieldDecoder $ parseAll strP
data NotificationInfo = NotificationInfo
{ ntfConnId :: ConnId,
ntfTs :: SystemTime,
ntfMsgMeta :: Maybe NMsgMeta
}
deriving (Show)
data ConnectionMode = CMInvitation | CMContact
deriving (Eq, Show)
data SConnectionMode (m :: ConnectionMode) where
SCMInvitation :: SConnectionMode CMInvitation
SCMContact :: SConnectionMode CMContact
deriving instance Eq (SConnectionMode m)
deriving instance Show (SConnectionMode m)
instance TestEquality SConnectionMode where
testEquality SCMInvitation SCMInvitation = Just Refl
testEquality SCMContact SCMContact = Just Refl
testEquality _ _ = Nothing
data AConnectionMode = forall m. ConnectionModeI m => ACM (SConnectionMode m)
instance Eq AConnectionMode where
ACM m == ACM m' = isJust $ testEquality m m'
cmInvitation :: AConnectionMode
cmInvitation = ACM SCMInvitation
cmContact :: AConnectionMode
cmContact = ACM SCMContact
deriving instance Show AConnectionMode
connMode :: SConnectionMode m -> ConnectionMode
connMode SCMInvitation = CMInvitation
connMode SCMContact = CMContact
connMode' :: ConnectionMode -> AConnectionMode
connMode' CMInvitation = cmInvitation
connMode' CMContact = cmContact
class ConnectionModeI (m :: ConnectionMode) where sConnectionMode :: SConnectionMode m
instance ConnectionModeI CMInvitation where sConnectionMode = SCMInvitation
instance ConnectionModeI CMContact where sConnectionMode = SCMContact
type MsgHash = ByteString
-- | Agent message metadata sent to the client
data MsgMeta = MsgMeta
{ integrity :: MsgIntegrity,
recipient :: (AgentMsgId, UTCTime),
broker :: (MsgId, UTCTime),
sndMsgId :: AgentMsgId
}
deriving (Eq, Show)
data SMPConfirmation = SMPConfirmation
{ -- | sender's public key to use for authentication of sender's commands at the recepient's server
senderKey :: SndPublicVerifyKey,
-- | sender's DH public key for simple per-queue e2e encryption
e2ePubKey :: C.PublicKeyX25519,
-- | sender's information to be associated with the connection, e.g. sender's profile information
connInfo :: ConnInfo,
-- | optional reply queues included in confirmation (added in agent protocol v2)
smpReplyQueues :: [SMPQueueInfo],
-- | SMP client version
smpClientVersion :: Version
}
deriving (Show)
data AgentMsgEnvelope
= AgentConfirmation
{ agentVersion :: Version,
e2eEncryption :: Maybe (E2ERatchetParams 'C.X448),
encConnInfo :: ByteString
}
| AgentMsgEnvelope
{ agentVersion :: Version,
encAgentMessage :: ByteString
}
| AgentInvitation -- the connInfo in contactInvite is only encrypted with per-queue E2E, not with double ratchet,
{ agentVersion :: Version,
connReq :: ConnectionRequestUri 'CMInvitation,
connInfo :: ByteString -- this message is only encrypted with per-queue E2E, not with double ratchet,
}
deriving (Show)
instance Encoding AgentMsgEnvelope where
smpEncode = \case
AgentConfirmation {agentVersion, e2eEncryption, encConnInfo} ->
smpEncode (agentVersion, 'C', e2eEncryption, Tail encConnInfo)
AgentMsgEnvelope {agentVersion, encAgentMessage} ->
smpEncode (agentVersion, 'M', Tail encAgentMessage)
AgentInvitation {agentVersion, connReq, connInfo} ->
smpEncode (agentVersion, 'I', Large $ strEncode connReq, Tail connInfo)
smpP = do
agentVersion <- smpP
smpP >>= \case
'C' -> do
(e2eEncryption, Tail encConnInfo) <- smpP
pure AgentConfirmation {agentVersion, e2eEncryption, encConnInfo}
'M' -> do
Tail encAgentMessage <- smpP
pure AgentMsgEnvelope {agentVersion, encAgentMessage}
'I' -> do
connReq <- strDecode . unLarge <$?> smpP
Tail connInfo <- smpP
pure AgentInvitation {agentVersion, connReq, connInfo}
_ -> fail "bad AgentMsgEnvelope"
-- SMP agent message formats (after double ratchet decryption,
-- or in case of AgentInvitation - in plain text body)
data AgentMessage
= AgentConnInfo ConnInfo
| -- AgentConnInfoReply is only used in duplexHandshake mode (v2), allowing to include reply queue(s) in the initial confirmation.
-- It makes REPLY message unnecessary.
AgentConnInfoReply (L.NonEmpty SMPQueueInfo) ConnInfo
| AgentMessage APrivHeader AMessage
deriving (Show)
instance Encoding AgentMessage where
smpEncode = \case
AgentConnInfo cInfo -> smpEncode ('I', Tail cInfo)
AgentConnInfoReply smpQueues cInfo -> smpEncode ('D', smpQueues, Tail cInfo) -- 'D' stands for "duplex"
AgentMessage hdr aMsg -> smpEncode ('M', hdr, aMsg)
smpP =
smpP >>= \case
'I' -> AgentConnInfo . unTail <$> smpP
'D' -> AgentConnInfoReply <$> smpP <*> (unTail <$> smpP)
'M' -> AgentMessage <$> smpP <*> smpP
_ -> fail "bad AgentMessage"
data AgentMessageType
= AM_CONN_INFO
| AM_CONN_INFO_REPLY
| AM_HELLO_
| AM_REPLY_
| AM_A_MSG_
| AM_QCONT_
| AM_QADD_
| AM_QKEY_
| AM_QUSE_
| AM_QTEST_
deriving (Eq, Show)
instance Encoding AgentMessageType where
smpEncode = \case
AM_CONN_INFO -> "C"
AM_CONN_INFO_REPLY -> "D"
AM_HELLO_ -> "H"
AM_REPLY_ -> "R"
AM_A_MSG_ -> "M"
AM_QCONT_ -> "QC"
AM_QADD_ -> "QA"
AM_QKEY_ -> "QK"
AM_QUSE_ -> "QU"
AM_QTEST_ -> "QT"
smpP =
A.anyChar >>= \case
'C' -> pure AM_CONN_INFO
'D' -> pure AM_CONN_INFO_REPLY
'H' -> pure AM_HELLO_
'R' -> pure AM_REPLY_
'M' -> pure AM_A_MSG_
'Q' ->
A.anyChar >>= \case
'C' -> pure AM_QCONT_
'A' -> pure AM_QADD_
'K' -> pure AM_QKEY_
'U' -> pure AM_QUSE_
'T' -> pure AM_QTEST_
_ -> fail "bad AgentMessageType"
_ -> fail "bad AgentMessageType"
agentMessageType :: AgentMessage -> AgentMessageType
agentMessageType = \case
AgentConnInfo _ -> AM_CONN_INFO
AgentConnInfoReply {} -> AM_CONN_INFO_REPLY
AgentMessage _ aMsg -> case aMsg of
-- HELLO is used both in v1 and in v2, but differently.
-- - in v1 (and, possibly, in v2 for simplex connections) can be sent multiple times,
-- until the queue is secured - the OK response from the server instead of initial AUTH errors confirms it.
-- - in v2 duplexHandshake it is sent only once, when it is known that the queue was secured.
HELLO -> AM_HELLO_
-- REPLY is only used in v1
REPLY _ -> AM_REPLY_
A_MSG _ -> AM_A_MSG_
QCONT _ -> AM_QCONT_
QADD _ -> AM_QADD_
QKEY _ -> AM_QKEY_
QUSE _ -> AM_QUSE_
QTEST _ -> AM_QTEST_
data APrivHeader = APrivHeader
{ -- | sequential ID assigned by the sending agent
sndMsgId :: AgentMsgId,
-- | digest of the previous message
prevMsgHash :: MsgHash
}
deriving (Show)
instance Encoding APrivHeader where
smpEncode APrivHeader {sndMsgId, prevMsgHash} =
smpEncode (sndMsgId, prevMsgHash)
smpP = APrivHeader <$> smpP <*> smpP
data AMsgType
= HELLO_
| REPLY_
| A_MSG_
| QCONT_
| QADD_
| QKEY_
| QUSE_
| QTEST_
deriving (Eq)
instance Encoding AMsgType where
smpEncode = \case
HELLO_ -> "H"
REPLY_ -> "R"
A_MSG_ -> "M"
QCONT_ -> "QC"
QADD_ -> "QA"
QKEY_ -> "QK"
QUSE_ -> "QU"
QTEST_ -> "QT"
smpP =
A.anyChar >>= \case
'H' -> pure HELLO_
'R' -> pure REPLY_
'M' -> pure A_MSG_
'Q' ->
A.anyChar >>= \case
'C' -> pure QCONT_
'A' -> pure QADD_
'K' -> pure QKEY_
'U' -> pure QUSE_
'T' -> pure QTEST_
_ -> fail "bad AMsgType"
_ -> fail "bad AMsgType"
-- | Messages sent between SMP agents once SMP queue is secured.
--
-- https://github.com/simplex-chat/simplexmq/blob/master/protocol/agent-protocol.md#messages-between-smp-agents
data AMessage
= -- | the first message in the queue to validate it is secured
HELLO
| -- | reply queues information
REPLY (L.NonEmpty SMPQueueInfo)
| -- | agent envelope for the client message
A_MSG MsgBody
| -- | the message instructing the client to continue sending messages (after ERR QUOTA)
QCONT SndQAddr
| -- add queue to connection (sent by recipient), with optional address of the replaced queue
QADD (L.NonEmpty (SMPQueueUri, Maybe SndQAddr))
| -- key to secure the added queues and agree e2e encryption key (sent by sender)
QKEY (L.NonEmpty (SMPQueueInfo, SndPublicVerifyKey))
| -- inform that the queues are ready to use (sent by recipient)
QUSE (L.NonEmpty (SndQAddr, Bool))
| -- sent by the sender to test new queues and to complete switching
QTEST (L.NonEmpty SndQAddr)
deriving (Show)
type SndQAddr = (SMPServer, SMP.SenderId)
instance Encoding AMessage where
smpEncode = \case
HELLO -> smpEncode HELLO_
REPLY smpQueues -> smpEncode (REPLY_, smpQueues)
A_MSG body -> smpEncode (A_MSG_, Tail body)
QCONT addr -> smpEncode (QCONT_, addr)
QADD qs -> smpEncode (QADD_, qs)
QKEY qs -> smpEncode (QKEY_, qs)
QUSE qs -> smpEncode (QUSE_, qs)
QTEST qs -> smpEncode (QTEST_, qs)
smpP =
smpP
>>= \case
HELLO_ -> pure HELLO
REPLY_ -> REPLY <$> smpP
A_MSG_ -> A_MSG . unTail <$> smpP
QCONT_ -> QCONT <$> smpP
QADD_ -> QADD <$> smpP
QKEY_ -> QKEY <$> smpP
QUSE_ -> QUSE <$> smpP
QTEST_ -> QTEST <$> smpP
instance forall m. ConnectionModeI m => StrEncoding (ConnectionRequestUri m) where
strEncode = \case
CRInvitationUri crData e2eParams -> crEncode "invitation" crData (Just e2eParams)
CRContactUri crData -> crEncode "contact" crData Nothing
where
crEncode :: ByteString -> ConnReqUriData -> Maybe (E2ERatchetParamsUri 'C.X448) -> ByteString
crEncode crMode ConnReqUriData {crScheme, crAgentVRange, crSmpQueues, crClientData} e2eParams =
strEncode crScheme <> "/" <> crMode <> "#/?" <> queryStr
where
queryStr =
strEncode . QSP QEscape $
[("v", strEncode crAgentVRange), ("smp", strEncode crSmpQueues)]
<> maybe [] (\e2e -> [("e2e", strEncode e2e)]) e2eParams
<> maybe [] (\cd -> [("data", encodeUtf8 cd)]) crClientData
strP = do
ACR m cr <- strP
case testEquality m $ sConnectionMode @m of
Just Refl -> pure cr
_ -> fail "bad connection request mode"
instance StrEncoding AConnectionRequestUri where
strEncode (ACR _ cr) = strEncode cr
strP = do
crScheme <- strP
crMode <- A.char '/' *> crModeP <* optional (A.char '/') <* "#/?"
query <- strP
crAgentVRange <- queryParam "v" query
crSmpQueues <- queryParam "smp" query
let crClientData = safeDecodeUtf8 <$> queryParamStr "data" query
let crData = ConnReqUriData {crScheme, crAgentVRange, crSmpQueues, crClientData}
case crMode of
CMInvitation -> do
crE2eParams <- queryParam "e2e" query
pure . ACR SCMInvitation $ CRInvitationUri crData crE2eParams
CMContact -> pure . ACR SCMContact $ CRContactUri crData
where
crModeP = "invitation" $> CMInvitation <|> "contact" $> CMContact
instance ConnectionModeI m => FromJSON (ConnectionRequestUri m) where
parseJSON = strParseJSON "ConnectionRequestUri"
instance ConnectionModeI m => ToJSON (ConnectionRequestUri m) where
toJSON = strToJSON
toEncoding = strToJEncoding
instance FromJSON AConnectionRequestUri where
parseJSON = strParseJSON "ConnectionRequestUri"
instance ToJSON AConnectionRequestUri where
toJSON = strToJSON
toEncoding = strToJEncoding
-- debug :: Show a => String -> a -> a
-- debug name value = unsafePerformIO (putStrLn $ name <> ": " <> show value) `seq` value
-- {-# INLINE debug #-}
instance StrEncoding ConnectionMode where
strEncode = \case
CMInvitation -> "INV"
CMContact -> "CON"
strP = "INV" $> CMInvitation <|> "CON" $> CMContact
instance StrEncoding AConnectionMode where
strEncode (ACM cMode) = strEncode $ connMode cMode
strP = connMode' <$> strP
connModeT :: Text -> Maybe ConnectionMode
connModeT = \case
"INV" -> Just CMInvitation
"CON" -> Just CMContact
_ -> Nothing
-- | SMP agent connection ID.
type ConnId = ByteString
type RcvFileId = ByteString
type SndFileId = ByteString
type ConfirmationId = ByteString
type InvitationId = ByteString
extraSMPServerHosts :: Map TransportHost TransportHost
extraSMPServerHosts =
M.fromList
[ ("smp4.simplex.im", "o5vmywmrnaxalvz6wi3zicyftgio6psuvyniis6gco6bp6ekl4cqj4id.onion"),
("smp5.simplex.im", "jjbyvoemxysm7qxap7m5d5m35jzv5qq6gnlv7s4rsn7tdwwmuqciwpid.onion"),
("smp6.simplex.im", "bylepyau3ty4czmn77q4fglvperknl4bi2eb2fdy2bh4jxtf32kf73yd.onion"),
("smp8.simplex.im", "beccx4yfxxbvyhqypaavemqurytl6hozr47wfc7uuecacjqdvwpw2xid.onion"),
("smp9.simplex.im", "jssqzccmrcws6bhmn77vgmhfjmhwlyr3u7puw4erkyoosywgl67slqqd.onion"),
("smp10.simplex.im", "rb2pbttocvnbrngnwziclp2f4ckjq65kebafws6g4hy22cdaiv5dwjqd.onion")
]
updateSMPServerHosts :: SMPServer -> SMPServer
updateSMPServerHosts srv@ProtocolServer {host} = case host of
h :| [] -> case M.lookup h extraSMPServerHosts of
Just h' -> srv {host = [h, h']}
_ -> srv
_ -> srv
class SMPQueue q where
qServer :: q -> SMPServer
qAddress :: q -> (SMPServer, SMP.QueueId)
sameQueue :: (SMPServer, SMP.QueueId) -> q -> Bool
data SMPQueueInfo = SMPQueueInfo {clientVersion :: Version, queueAddress :: SMPQueueAddress}
deriving (Eq, Show)
instance Encoding SMPQueueInfo where
smpEncode (SMPQueueInfo clientVersion SMPQueueAddress {smpServer, senderId, dhPublicKey})
| clientVersion > 1 = smpEncode (clientVersion, smpServer, senderId, dhPublicKey)
| otherwise = smpEncode clientVersion <> legacyEncodeServer smpServer <> smpEncode (senderId, dhPublicKey)
smpP = do
clientVersion <- smpP
smpServer <- if clientVersion > 1 then smpP else updateSMPServerHosts <$> legacyServerP
(senderId, dhPublicKey) <- smpP
pure $ SMPQueueInfo clientVersion SMPQueueAddress {smpServer, senderId, dhPublicKey}
-- This instance seems contrived and there was a temptation to split a common part of both types.
-- But this is created to allow backward and forward compatibility where SMPQueueUri
-- could have more fields to convert to different versions of SMPQueueInfo in a different way,
-- and this instance would become non-trivial.
instance VersionI SMPQueueInfo where
type VersionRangeT SMPQueueInfo = SMPQueueUri
version = clientVersion
toVersionRangeT (SMPQueueInfo _v addr) vr = SMPQueueUri vr addr
instance VersionRangeI SMPQueueUri where
type VersionT SMPQueueUri = SMPQueueInfo
versionRange = clientVRange
toVersionT (SMPQueueUri _vr addr) v = SMPQueueInfo v addr
-- | SMP queue information sent out-of-band.
--
-- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#out-of-band-messages
data SMPQueueUri = SMPQueueUri {clientVRange :: VersionRange, queueAddress :: SMPQueueAddress}
deriving (Eq, Show)
data SMPQueueAddress = SMPQueueAddress
{ smpServer :: SMPServer,
senderId :: SMP.SenderId,
dhPublicKey :: C.PublicKeyX25519
}
deriving (Eq, Show)
instance SMPQueue SMPQueueUri where
qServer SMPQueueUri {queueAddress} = qServer queueAddress
{-# INLINE qServer #-}
qAddress SMPQueueUri {queueAddress} = qAddress queueAddress
{-# INLINE qAddress #-}
sameQueue addr q = sameQAddress addr (qAddress q)
{-# INLINE sameQueue #-}
instance SMPQueue SMPQueueInfo where
qServer SMPQueueInfo {queueAddress} = qServer queueAddress
{-# INLINE qServer #-}
qAddress SMPQueueInfo {queueAddress} = qAddress queueAddress
{-# INLINE qAddress #-}
sameQueue addr q = sameQAddress addr (qAddress q)
{-# INLINE sameQueue #-}
instance SMPQueue SMPQueueAddress where
qServer SMPQueueAddress {smpServer} = smpServer
{-# INLINE qServer #-}
qAddress SMPQueueAddress {smpServer, senderId} = (smpServer, senderId)
{-# INLINE qAddress #-}
sameQueue addr q = sameQAddress addr (qAddress q)
{-# INLINE sameQueue #-}
sameQAddress :: (SMPServer, SMP.QueueId) -> (SMPServer, SMP.QueueId) -> Bool
sameQAddress (srv, qId) (srv', qId') = sameSrvAddr srv srv' && qId == qId'
{-# INLINE sameQAddress #-}