Merge pull request #2064 from hmhealey/plt882

PLT-882 Ephemeral Messages and Out-Of-Channel mentions

model/message.go

@@ -18,6 +18,7 @@ const (
 	ACTION_USER_ADDED         = "user_added"
 	ACTION_USER_REMOVED       = "user_removed"
 	ACTION_PREFERENCE_CHANGED = "preference_changed"
+	ACTION_EPHEMERAL_MESSAGE  = "ephemeral_message"
 )
 
 type Message struct {

model/post.go

@@ -13,8 +13,10 @@ const (
 	POST_SYSTEM_MESSAGE_PREFIX = "system_"
 	POST_DEFAULT               = ""
 	POST_SLACK_ATTACHMENT      = "slack_attachment"
+	POST_SYSTEM_GENERIC        = "system_generic"
 	POST_JOIN_LEAVE            = "system_join_leave"
 	POST_HEADER_CHANGE         = "system_header_change"
+	POST_EPHEMERAL             = "system_ephemeral"
 )
 
 type Post struct {