debugging channels

README.md

@@ -71,11 +71,11 @@ When you register a new account you are asked for an email address to send valid
   * [iOS](https://github.com/tinode/ios)
   * [Web](https://github.com/tinode/webapp/)
   * Scriptable [command line](tn-cli/)
-* One-on-one messaging.
-* Group messaging with every member's access permissions managed individually. The maximum number of members is configurable (128 by default).
+* One-on-one and group messaging.
+* Channels with an unlimited number (or hundreds of thousands) of members.
 * Sharded clustering with failover.
 * Flexible access control with permissions for various actions.
-* Server-generated presence notifications for people, group conversations.
+* Server-generated presence notifications for people, group chats.
 * Support for custom authentication backends.
 * Bindings for various programming languages:
   * Javascript with no external dependencies.
@@ -93,15 +93,13 @@ When you register a new account you are asked for an email address to send valid
 * Support for client-side data caching.
 * Ability to block unwanted communication server-side.
 * Anonymous users (important for use cases related to tech support over chat).
-* Push notifications using [FCM](https://firebase.google.com/docs/cloud-messaging/) or [TNPG](server/push/tnpg/).
 * Storage and out of band transfer of large objects like video files using local file system or Amazon S3.
 * Plugins to extend functionality, for example, to enable chatbots.
 
 ### Planned
 
 * [Federation](https://en.wikipedia.org/wiki/Federation_(information_technology)).
 * End to end encryption with [OTR](https://en.wikipedia.org/wiki/Off-the-Record_Messaging) for one-on-one messaging and undecided method for group messaging.
-* Channels with an unlimited number (or hundreds of thousands) of members with bearer token access control.
 * Hot standby.
 * Different levels of message persistence (from strict persistence to "store until delivered" to purely ephemeral messaging).
 

docs/API.md

@@ -417,6 +417,7 @@ A `channel` topic is different from the non-channel group topic in the following
  * Channel topic is created by sending `{sub topic="nch"}`. Sending `{sub topic="new"}` will create a group topic without enabling channel functionality.
  * Sending `{sub topic="chnAbC123"}` will create a `reader` subscription to a channel. A non-channel topic will reject such subscription request.
  * When searching for topics using [`fnd`](#fnd-and-tags-finding-users-and-topics), channels will show addresses with `chn` prefixes, non-channel topic will show with `grp` prefixes.
+ * Messages received by readers on channels have no `From` field. Normal subscribers will receive messages with `From` containing ID of the sender.
  * Default permissions for a channel and non-channel group topics are different: channel group topic grants no permissions at all.
  * A subscriber joining or leaving the topic (regular or channel-enabled) generates a `{pres}` message to all other subscribers who are currently in the joined state with the topic and have appropriate permissions. Reader joining or leaving the channel generates no `{pres}` message.
 

server/datamodel.go

@@ -882,13 +882,14 @@ func NoErrShutdown(ts time.Time) *ServerComMessage {
 }
 
 // NoErrDelivered means requested content has been delivered (208).
-func NoErrDeliveredParams(ts time.Time, topic string, params interface{}) *ServerComMessage {
+func NoErrDeliveredParams(id, topic string, ts time.Time, params interface{}) *ServerComMessage {
 	return &ServerComMessage{Ctrl: &MsgServerCtrl{
+		Id:        id,
 		Code:      http.StatusAlreadyReported, // 208
 		Text:      "delivered",
 		Topic:     topic,
 		Params:    params,
-		Timestamp: ts}}
+		Timestamp: ts}, Id: id}
 }
 
 // 3xx

server/topic.go

@@ -1024,17 +1024,19 @@ func (t *Topic) subscriptionReply(h *Hub, join *sessionJoin) error {
 
 	params := map[string]interface{}{}
 	if changed {
-		pud := t.perUser[asUid]
-		// Report back the assigned access mode.
-		params["acs"] = &MsgAccessMode{
-			Given: pud.modeGiven.String(),
-			Want:  pud.modeWant.String(),
-			Mode:  (pud.modeGiven & pud.modeWant).String()}
-	} else if isChannel(join.pkt.Original) {
-		params["acs"] = &MsgAccessMode{
-			Given: types.ModeCChn.String()
-			Want:  types.ModeCChn.String()
-			Mode: types.ModeCChn.String()}
+		if isChannel(join.pkt.Original) {
+			params["acs"] = &MsgAccessMode{
+				Given: types.ModeCChn.String(),
+				Want:  types.ModeCChn.String(),
+				Mode:  types.ModeCChn.String()}
+		} else {
+			pud := t.perUser[asUid]
+			// Report back the assigned access mode.
+			params["acs"] = &MsgAccessMode{
+				Given: pud.modeGiven.String(),
+				Want:  pud.modeWant.String(),
+				Mode:  (pud.modeGiven & pud.modeWant).String()}
+		}
 	}
 
 	toriginal := t.original(asUid)
@@ -1317,7 +1319,6 @@ func (t *Topic) thisUserSub(h *Hub, sess *Session, pkt *ClientComMessage, asUid
 	}
 
 	if !isChanSub {
-
 		// If topic is being muted, send "off" notification and disable updates.
 		// Do it before applying the new permissions.
 		if (oldWant & oldGiven).IsPresencer() && !(userData.modeWant & userData.modeGiven).IsPresencer() {
@@ -2137,9 +2138,11 @@ func (t *Topic) replyGetData(sess *Session, asUid types.Uid, id string, req *Msg
 		return errors.New("invalid MsgGetOpts query")
 	}
 
+	asChan := isChannel(toriginal)
+
 	// Check if the user has permission to read the topic data
 	count := 0
-	if userData := t.perUser[asUid]; (userData.modeGiven & userData.modeWant).IsReader() {
+	if userData := t.perUser[asUid]; (userData.modeGiven & userData.modeWant).IsReader() || asChan {
 		// Read messages from DB
 		messages, err := store.Messages.GetAll(t.name, asUid, msgOpts2storeOpts(req))
 		if err != nil {
@@ -2152,11 +2155,16 @@ func (t *Topic) replyGetData(sess *Session, asUid types.Uid, id string, req *Msg
 			count = len(messages)
 			for i := range messages {
 				mm := &messages[i]
+				from := ""
+				if !asChan {
+					// Don't show sender for channel readers
+					from = types.ParseUid(mm.From).UserId()
+				}
 				sess.queueOut(&ServerComMessage{Data: &MsgServerData{
 					Topic:     toriginal,
 					Head:      mm.Head,
 					SeqId:     mm.SeqId,
-					From:      types.ParseUid(mm.From).UserId(),
+					From:      from,
 					Timestamp: mm.CreatedAt,
 					Content:   mm.Content}})
 			}
@@ -2334,7 +2342,7 @@ func (t *Topic) replyGetDel(sess *Session, asUid types.Uid, id string, req *MsgG
 	}
 
 	// Check if the user has permission to read the topic data and the request is valid
-	if userData := t.perUser[asUid]; (userData.modeGiven & userData.modeWant).IsReader() {
+	if userData := t.perUser[asUid]; (userData.modeGiven & userData.modeWant).IsReader() || isChannel(toriginal) {
 		ranges, delID, err := store.Messages.GetDeleted(t.name, asUid, msgOpts2storeOpts(req))
 		if err != nil {
 			sess.queueOut(ErrUnknown(id, toriginal, now))