Disallow changing type when updating a channel (#13387)

api4/channel.go

@@ -143,8 +143,13 @@ func updateChannel(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	if len(channel.Type) > 0 && channel.Type != oldChannel.Type {
+		c.Err = model.NewAppError("updateChannel", "api.channel.update_channel.typechange.app_error", nil, "", http.StatusBadRequest)
+		return
+	}
+
 	if oldChannel.Name == model.DEFAULT_CHANNEL {
-		if (len(channel.Name) > 0 && channel.Name != oldChannel.Name) || (len(channel.Type) > 0 && channel.Type != oldChannel.Type) {
+		if len(channel.Name) > 0 && channel.Name != oldChannel.Name {
 			c.Err = model.NewAppError("updateChannel", "api.channel.update_channel.tried.app_error", map[string]interface{}{"Channel": model.DEFAULT_CHANNEL}, "", http.StatusBadRequest)
 			return
 		}
@@ -163,10 +168,6 @@ func updateChannel(c *Context, w http.ResponseWriter, r *http.Request) {
 		oldChannel.Name = channel.Name
 	}
 
-	if len(channel.Type) > 0 {
-		oldChannel.Type = channel.Type
-	}
-
 	if channel.GroupConstrained != nil {
 		oldChannel.GroupConstrained = channel.GroupConstrained
 	}