PLT-6610 sending websocket event for last channel viewed (#6787)

model/config.go

@@ -158,6 +158,7 @@ type ServiceSettings struct {
 	TimeBetweenUserTypingUpdatesMilliseconds *int64
 	EnablePostSearch                         *bool
 	EnableUserTypingMessages                 *bool
+	EnablChannelViewedMessages               *bool
 	EnableUserStatuses                       *bool
 	ClusterLogTimeoutMilliseconds            *int
 }
@@ -1300,6 +1301,11 @@ func (o *Config) SetDefaults() {
 		*o.ServiceSettings.EnableUserTypingMessages = true
 	}
 
+	if o.ServiceSettings.EnablChannelViewedMessages == nil {
+		o.ServiceSettings.EnablChannelViewedMessages = new(bool)
+		*o.ServiceSettings.EnablChannelViewedMessages = true
+	}
+
 	if o.ServiceSettings.EnableUserStatuses == nil {
 		o.ServiceSettings.EnableUserStatuses = new(bool)
 		*o.ServiceSettings.EnableUserStatuses = true

model/websocket_message.go

@@ -37,6 +37,7 @@ const (
 	WEBSOCKET_EVENT_REACTION_REMOVED    = "reaction_removed"
 	WEBSOCKET_EVENT_RESPONSE            = "response"
 	WEBSOCKET_EVENT_EMOJI_ADDED         = "emoji_added"
+	WEBSOCKET_EVENT_CHANNEL_VIEWED      = "channel_viewed"
 )
 
 type WebSocketMessage interface {