.gitignore

@@ -33,4 +33,5 @@ data-dir-cwtchtool/
 tokens
 tordir/
 testing/autodownload/download_dir
-testing/autodownload/storage
+testing/autodownload/storage
+*.swp

model/message_utils.go

@@ -3,6 +3,7 @@ package model
 import (
 	"crypto/sha256"
 	"encoding/base64"
+	"encoding/json"
 )
 
 // CalculateContentHash derives a hash using the author and the message body. It is intended to be
@@ -12,3 +13,13 @@ func CalculateContentHash(author string, messageBody string) string {
 	contentBasedHash := sha256.Sum256(content)
 	return base64.StdEncoding.EncodeToString(contentBasedHash[:])
 }
+
+func DeserializeMessage(message string) (*MessageWrapper, error) {
+	var cm MessageWrapper
+	err := json.Unmarshal([]byte(message), &cm)
+
+	if err != nil {
+		return nil, err
+	}
+	return &cm, err
+}

model/overlay.go

@@ -1,9 +1,40 @@
 package model
 
+import (
+	"time"
+)
+
 // MessageWrapper is the canonical Cwtch overlay wrapper
 type MessageWrapper struct {
 	Overlay int    `json:"o"`
 	Data    string `json:"d"`
+
+	// when the data was assembled
+	SendTime *time.Time `json:"s,omitempty"`
+
+	// when the data was transmitted (by protocol engine e.g. over Tor)
+	TransitTime *time.Time `json:"t,omitempty"`
+
+	// when the data was received
+	RecvTime *time.Time `json:"r,omitempty"`
+}
+
+// Channel is defined as being the last 3 bits of the overlay id
+// Channel 0 is reserved for the main conversation
+// Channel 2 is reserved for conversation admin (managed groups)
+// Channel 7 is reserved for streams (no ack, no store)
+func (mw MessageWrapper) Channel() int {
+	if mw.Overlay > 1024 {
+		return mw.Overlay & 0x07
+	}
+	// for backward compatibilty all overlays less than 0x400 i.e. 1024 are
+	// mapped to channel 0 regardless of their channel status.
+	return 0
+}
+
+// If Overlay is a Stream Message it should not be ackd, or stored.
+func (mw MessageWrapper) IsStream() bool {
+	return mw.Channel() == 0x07
 }
 
 // OverlayChat is the canonical identifier for chat overlays

peer/cwtch_peer.go

@@ -3,11 +3,20 @@ package peer
 import (
 	"context"
 	"crypto/rand"
+	"cwtch.im/cwtch/model"
+	"cwtch.im/cwtch/model/constants"
+	"cwtch.im/cwtch/protocol/groups"
+	"cwtch.im/cwtch/settings"
 	"encoding/base64"
 	"encoding/hex"
 	"encoding/json"
 	"errors"
 	"fmt"
+	"git.openprivacy.ca/cwtch.im/tapir/primitives"
+	"git.openprivacy.ca/cwtch.im/tapir/primitives/privacypass"
+	"git.openprivacy.ca/openprivacy/connectivity"
+	"git.openprivacy.ca/openprivacy/connectivity/tor"
+	"golang.org/x/crypto/ed25519"
 	"os"
 	path "path/filepath"
 	"sort"
@@ -16,17 +25,7 @@ import (
 	"sync"
 	"time"
 
-	"cwtch.im/cwtch/model/constants"
-	"cwtch.im/cwtch/protocol/groups"
-	"cwtch.im/cwtch/settings"
-	"git.openprivacy.ca/cwtch.im/tapir/primitives"
-	"git.openprivacy.ca/cwtch.im/tapir/primitives/privacypass"
-	"git.openprivacy.ca/openprivacy/connectivity"
-	"git.openprivacy.ca/openprivacy/connectivity/tor"
-	"golang.org/x/crypto/ed25519"
-
 	"cwtch.im/cwtch/event"
-	"cwtch.im/cwtch/model"
 	"cwtch.im/cwtch/model/attr"
 	"cwtch.im/cwtch/protocol/connections"
 	"git.openprivacy.ca/openprivacy/log"
@@ -435,12 +434,19 @@ func (cp *cwtchPeer) SendMessage(conversation int, message string) (int, error)
 		if tor.IsValidHostname(conversationInfo.Handle) {
 			ev := event.NewEvent(event.SendMessageToPeer, map[event.Field]string{event.ConversationID: strconv.Itoa(conversationInfo.ID), event.RemotePeer: conversationInfo.Handle, event.Data: message})
 			onion, _ := cp.storage.LoadProfileKeyValue(TypeAttribute, attr.PublicScope.ConstructScopedZonedPath(attr.ProfileZone.ConstructZonedPath(constants.Onion)).ToString())
+			id := -1
 
-			// For p2p messages we store the event id of the message as the "signature" we can then look this up in the database later for acks
-			id, err := cp.storage.InsertMessage(conversationInfo.ID, 0, message, model.Attributes{constants.AttrAuthor: string(onion), constants.AttrAck: event.False, constants.AttrSentTimestamp: time.Now().Format(time.RFC3339Nano)}, ev.EventID, model.CalculateContentHash(string(onion), message))
-			if err != nil {
-				return -1, err
+			// check if we should store this message locally...
+			if cm, err := model.DeserializeMessage(message); err == nil {
+				if !cm.IsStream() {
+					// For p2p messages we store the event id of the message as the "signature" we can then look this up in the database later for acks
+					id, err = cp.storage.InsertMessage(conversationInfo.ID, 0, message, model.Attributes{constants.AttrAuthor: string(onion), constants.AttrAck: event.False, constants.AttrSentTimestamp: time.Now().Format(time.RFC3339Nano)}, ev.EventID, model.CalculateContentHash(string(onion), message))
+					if err != nil {
+						return -1, err
+					}
+				}
 			}
+
 			cp.eventBus.Publish(ev)
 			return id, nil
 		} else {
@@ -1482,6 +1488,15 @@ func (cp *cwtchPeer) storeMessage(handle string, message string, sent time.Time)
 		}
 	}
 
+	// Don't store messages in channel 7
+	if cm, err := model.DeserializeMessage(message); err == nil {
+		if cm.IsStream() {
+			return -1, nil
+		}
+	} else {
+		return -1, err
+	}
+
 	// Generate a random number and use it as the signature
 	signature := event.GetRandNumber().String()
 	return cp.storage.InsertMessage(ci.ID, 0, message, model.Attributes{constants.AttrAuthor: handle, constants.AttrAck: event.True, constants.AttrSentTimestamp: sent.Format(time.RFC3339Nano)}, signature, model.CalculateContentHash(handle, message))

protocol/connections/engine.go

@@ -749,6 +749,16 @@ func (e *engine) handlePeerMessage(hostname string, eventID string, context stri
 		// Fall through handler for the default text conversation.
 		e.eventManager.Publish(event.NewEvent(event.NewMessageFromPeerEngine, map[event.Field]string{event.TimestampReceived: time.Now().Format(time.RFC3339Nano), event.RemotePeer: hostname, event.Data: string(message)}))
 
+		// Don't ack messages in channel 7
+		// Note: this code explictly doesn't care about malformed messages, we deal with them
+		// later on...we still want to ack the original send...(as some "malformed" messages
+		// may be future-ok)
+		if cm, err := model.DeserializeMessage(string(message)); err == nil {
+			if cm.IsStream() {
+				return
+			}
+		}
+
 		// Send an explicit acknowledgement
 		// Every other protocol should have an explicit acknowledgement message e.g. value lookups have responses, and file handling has an explicit flow
 		if err := e.sendPeerMessage(hostname, pmodel.PeerMessage{ID: eventID, Context: event.ContextAck, Data: []byte{}}); err != nil {

protocol/connections/peerapp.go

@@ -2,12 +2,14 @@ package connections
 
 import (
 	"cwtch.im/cwtch/event"
+	"cwtch.im/cwtch/model"
 	model2 "cwtch.im/cwtch/protocol/model"
 	"encoding/json"
 	"git.openprivacy.ca/cwtch.im/tapir"
 	"git.openprivacy.ca/cwtch.im/tapir/applications"
 	"git.openprivacy.ca/openprivacy/log"
 	"sync/atomic"
+	"time"
 )
 
 const cwtchCapability = tapir.Capability("cwtchCapability")
@@ -133,6 +135,14 @@ func (pa *PeerApp) listen() {
 						pa.version.Store(Version2)
 					}
 				} else {
+					if cm, err := model.DeserializeMessage(string(packet.Data)); err == nil {
+						if cm.TransitTime != nil {
+							rt := time.Now().UTC()
+							cm.RecvTime = &rt
+							data, _ := json.Marshal(cm)
+							packet.Data = data
+						}
+					}
 					pa.MessageHandler(pa.connection.Hostname(), packet.ID, packet.Context, packet.Data)
 				}
 			}
@@ -148,6 +158,15 @@ func (pa *PeerApp) SendMessage(message model2.PeerMessage) error {
 	var serialized []byte
 	var err error
 
+	if cm, err := model.DeserializeMessage(string(message.Data)); err == nil {
+		if cm.SendTime != nil {
+			tt := time.Now().UTC()
+			cm.TransitTime = &tt
+			data, _ := json.Marshal(cm)
+			message.Data = data
+		}
+	}
+
 	if pa.version.Load() == Version2 {
 		// treat data as a pre-serialized string, not as a byte array (which will be base64 encoded and bloat the packet size)
 		serialized = message.Serialize()