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forum: project the forum's own channel with member state in getForumTopics

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messages.getForumTopics returned every chat via tgChannels -> tgChannelChatMin,
so the forum's own channel came back as a min object with left unset. A client
with no other object for that peer (a fresh account browsing a public forum by
username) then rendered the forum as already joined: topic list visible, no
Join button, but no messages.

Render the primary channel with tgChannelChatForView so a non-member preview
carries left=true; keep the other referenced channels as min.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Astra 2026-09-09 13:53:20 +01:00
parent b52d3f3f64
commit a9fbb1f80d
2 changed files with 41 additions and 1 deletions
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15
internal/rpc/forum_topics_preview_rpc_test.go
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@ -81,6 +81,21 @@ func TestGetForumTopicsVisibleToPublicNonMember(t *testing.T) {
t.Fatalf("non-member did not see the Test topic: %+v", res.Topics)
}
// The forum's own channel must come back with left=true so the client still
// offers a Join button instead of treating the forum as already joined.
var forumChat *tg.Channel
for _, c := range res.Chats {
if ch, ok := c.(*tg.Channel); ok && ch.ID == channel.ID {
forumChat = ch
}
}
if forumChat == nil {
t.Fatalf("forum channel missing from getForumTopics chats: %+v", res.Chats)
}
if !forumChat.Left {
t.Fatalf("non-member forum chat = %#v, want left=true", forumChat)
}
// A private forum still refuses a non-member.
priv, err := r.onChannelsCreateChannel(ownerCtx, &tg.ChannelsCreateChannelRequest{Title: "Private Forum", Megagroup: true})
if err != nil {