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forum: fix reply_to_top_id for replies inside a forum

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resolveChannelReply applied discussion-thread logic (reply_to_top_id =
the replied-to message's own id) to forum replies. Replying to a General
message produced reply_to_top_id = <that id>, a topic no client can
resolve: the reply vanished from every topic view and reply-jump on
strict clients said "message doesn't exist".

Forum replies now inherit the target's topic via domain.ForumReplyTopicID
(target's topic, or its own id if it's a topic-create, else General), and
General (topic 1) is accepted as a valid virtual topic everywhere, so
sends carrying top_msg_id: 1 are no longer rejected. Non-forum discussion
threads are unchanged.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Astra 2026-09-09 11:15:56 +01:00
parent 443ca300b9
commit 41f65bf0fc
4 changed files with 213 additions and 37 deletions
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52
internal/store/memory/channel_helpers.go
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@ -540,18 +540,14 @@ func (s *ChannelStore) resolveChannelReplyLocked(req domain.SendChannelMessageRe
if req.ReplyTo.TopMessageID <= 0 || !channel.Forum {
return nil, domain.ErrReplyMessageIDInvalid
}
topic, ok := s.topics[req.ChannelID][req.ReplyTo.TopMessageID]
if !ok || topic.Hidden {
return nil, domain.ErrReplyMessageIDInvalid
}
if topic.Closed && !canManageForumTopic(channel, member, topic, req.UserID, selfBoostsApplied) {
return nil, domain.ErrChannelWriteForbidden
}
reply := cloneMessageReply(req.ReplyTo)
reply.MessageID = 0
reply.Peer = channelPeer
reply.TopMessageID = topic.TopicID
reply.ForumTopic = true
if err := s.validateForumReplyTopicLocked(channel, member, req.ReplyTo.TopMessageID, req.UserID, selfBoostsApplied); err != nil {
return nil, err
}
reply.TopMessageID = req.ReplyTo.TopMessageID
return reply, nil
}
target, ok := s.findMessageLocked(req.ChannelID, req.ReplyTo.MessageID)
@ -561,6 +557,22 @@ func (s *ChannelStore) resolveChannelReplyLocked(req domain.SendChannelMessageRe
reply := cloneMessageReply(req.ReplyTo)
reply.MessageID = target.ID
reply.Peer = channelPeer
if channel.Forum {
// A forum reply belongs to the TARGET's topic, never the target's own id.
topicID := domain.ForumReplyTopicID(target)
if req.ReplyTo.TopMessageID > 0 && req.ReplyTo.TopMessageID != topicID {
return nil, domain.ErrReplyMessageIDInvalid
}
if err := s.validateForumReplyTopicLocked(channel, member, topicID, req.UserID, selfBoostsApplied); err != nil {
return nil, err
}
reply.TopMessageID = topicID
reply.ForumTopic = true
return reply, nil
}
// Non-forum discussion thread: reply_to_top_id is the comment-thread root.
reply.TopMessageID = target.ID
if target.ReplyTo != nil && target.ReplyTo.TopMessageID > 0 {
reply.TopMessageID = target.ReplyTo.TopMessageID
@ -568,17 +580,25 @@ func (s *ChannelStore) resolveChannelReplyLocked(req domain.SendChannelMessageRe
if req.ReplyTo.TopMessageID > 0 && req.ReplyTo.TopMessageID != reply.TopMessageID {
return nil, domain.ErrReplyMessageIDInvalid
}
if channel.Forum && reply.TopMessageID > 0 {
if topic, ok := s.topics[req.ChannelID][reply.TopMessageID]; ok && !topic.Hidden {
if topic.Closed && !canManageForumTopic(channel, member, topic, req.UserID, selfBoostsApplied) {
return nil, domain.ErrChannelWriteForbidden
}
reply.ForumTopic = true
}
}
return reply, nil
}
// validateForumReplyTopicLocked mirrors the postgres store: General
// (ForumGeneralTopicID) is a virtual topic with no row and is always valid.
func (s *ChannelStore) validateForumReplyTopicLocked(channel domain.Channel, member domain.ChannelMember, topicID int, userID int64, selfBoostsApplied int) error {
if topicID == domain.ForumGeneralTopicID {
return nil
}
topic, ok := s.topics[channel.ID][topicID]
if !ok || topic.Hidden {
return domain.ErrReplyMessageIDInvalid
}
if topic.Closed && !canManageForumTopic(channel, member, topic, userID, selfBoostsApplied) {
return domain.ErrChannelWriteForbidden
}
return nil
}
func inactiveChannelDate(dialog domain.Dialog, channel domain.Channel, member domain.ChannelMember) int {
if dialog.TopMessageDate > 0 {
return dialog.TopMessageDate