feat: add invite management, replies and subgroup support

crates/nip29/src/group.rs

@@ -12,7 +12,7 @@ use crate::LOCAL_KEYS;
 use crate::protocol::{
     ACTIVITY_KINDS, Activity, GroupAdmins, GroupId, GroupKey, GroupMembers, GroupMetadata,
     GroupPins, GroupRoles, MEMBERSHIP_KINDS, Membership, PIN_LIST, Pin, RENDER_KINDS, STATE_KINDS,
-    TimelineWindow,
+    TimelineWindow, tag_value,
 };
 
 const REPLAY_LIMIT: usize = 100;
@@ -34,6 +34,13 @@ pub struct Reaction {
     pub author: PublicKey,
 }
 
+#[derive(Debug, Clone)]
+pub struct Invite {
+    pub id: EventId,
+    pub code: String,
+    pub created_at: Timestamp,
+}
+
 #[derive(Debug, Clone)]
 pub enum Row {
     Message(Box<Message>),
@@ -86,6 +93,8 @@ pub struct Group {
     rows: Vec<Row>,
     index: HashSet<EventId>,
     reactions: HashMap<EventId, Vec<Reaction>>,
+    /// Active invite codes; revocations arrive as 9005 deletions.
+    invites: Vec<Invite>,
     leave_requests: HashMap<PublicKey, Timestamp>,
     window: TimelineWindow,
     oldest: Option<Timestamp>,
@@ -114,6 +123,7 @@ impl Group {
             rows: Vec::new(),
             index: HashSet::new(),
             reactions: HashMap::new(),
+            invites: Vec::new(),
             leave_requests: HashMap::new(),
             window: TimelineWindow::new(),
             oldest: None,
@@ -193,6 +203,10 @@ impl Group {
         self.reactions.get(id).map(Vec::as_slice).unwrap_or(&[])
     }
 
+    pub fn invites(&self) -> &[Invite] {
+        &self.invites
+    }
+
     pub fn loading_more(&self) -> bool {
         self.loading_more
     }
@@ -375,6 +389,7 @@ impl Group {
             let filters = [
                 key.id().timeline_filter(REPLAY_LIMIT),
                 key.id().membership_filter(me),
+                key.id().moderation_filter(REPLAY_LIMIT),
             ]
             .into_iter()
             .chain(key.id().state_filters())
@@ -523,13 +538,22 @@ impl Group {
     }
 
     pub(crate) fn forget(&mut self, id: EventId, cx: &mut Context<Self>) {
+        if self.retract(id) {
+            cx.emit(GroupEvent::Updated);
+            cx.notify();
+        }
+    }
+
+    /// Remove an event and everything attached to it.
+    fn retract(&mut self, id: EventId) -> bool {
         self.window.remove(id);
 
         if !self.index.remove(&id) {
-            return;
+            return false;
         }
 
         self.rows.retain(|row| row.id() != id);
+        self.invites.retain(|invite| invite.id != id);
         self.reactions.remove(&id);
 
         for reactions in self.reactions.values_mut() {
@@ -538,8 +562,7 @@ impl Group {
 
         self.reactions.retain(|_, reactions| !reactions.is_empty());
 
-        cx.emit(GroupEvent::Updated);
-        cx.notify();
+        true
     }
 
     pub(crate) fn eose(&mut self, cx: &mut Context<Self>) {
@@ -557,7 +580,7 @@ impl Group {
 
     fn absorb(&mut self, event: &Event, me: PublicKey) -> Absorbed {
         if STATE_KINDS.contains(&event.kind) {
-            return if self.absorb_state(event) {
+            return if self.absorb_state(event, me) {
                 Absorbed::Updated
             } else {
                 Absorbed::Ignored
@@ -583,6 +606,28 @@ impl Group {
             };
         }
 
+        if event.kind == Kind::GroupCreateInvite {
+            return if self.push_invite(event) {
+                Absorbed::Updated
+            } else {
+                Absorbed::Ignored
+            };
+        }
+
+        if event.kind == Kind::GroupDeleteEvent {
+            let retracted = event
+                .tags
+                .event_ids()
+                .next()
+                .is_some_and(|target| self.retract(target));
+
+            return if retracted {
+                Absorbed::Updated
+            } else {
+                Absorbed::Ignored
+            };
+        }
+
         if RENDER_KINDS.contains(&event.kind) {
             return Absorbed::Shown {
                 fresh: self.push_row(event),
@@ -625,18 +670,24 @@ impl Group {
         }
     }
 
-    fn absorb_state(&mut self, event: &Event) -> bool {
+    fn absorb_state(&mut self, event: &Event, me: PublicKey) -> bool {
         match event.kind {
             Kind::GroupMetadata => match GroupMetadata::parse(event) {
                 Ok(metadata) => self.metadata = Some(metadata),
                 Err(_) => return false,
             },
             Kind::GroupAdmins => match GroupAdmins::parse(event) {
-                Ok(admins) => self.admins = admins,
+                Ok(admins) => {
+                    self.admins = admins;
+                    self.adopt_roster_membership(me);
+                }
                 Err(_) => return false,
             },
             Kind::GroupMembers => match GroupMembers::parse(event) {
-                Ok(members) => self.members = members,
+                Ok(members) => {
+                    self.members = members;
+                    self.adopt_roster_membership(me);
+                }
                 Err(_) => return false,
             },
             Kind::GroupRoles => match GroupRoles::parse(event) {
@@ -653,6 +704,21 @@ impl Group {
         self.state_ids.insert(event.kind, event.id) != Some(event.id)
     }
 
+    fn adopt_roster_membership(&mut self, me: PublicKey) -> bool {
+        if self.membership != Membership::Unknown {
+            return false;
+        }
+
+        let listed = self.admins.contains(&me) || self.members.iter().any(|member| *member == me);
+
+        if !listed {
+            return false;
+        }
+
+        self.membership = Membership::Member;
+        true
+    }
+
     fn push_row(&mut self, event: &Event) -> bool {
         if !self.index.insert(event.id) {
             return false;
@@ -686,6 +752,24 @@ impl Group {
         true
     }
 
+    fn push_invite(&mut self, event: &Event) -> bool {
+        let Some(code) = tag_value(&event.tags, "code") else {
+            return false;
+        };
+
+        if !self.index.insert(event.id) {
+            return false;
+        }
+
+        self.invites.push(Invite {
+            id: event.id,
+            code: code.to_owned(),
+            created_at: event.created_at,
+        });
+
+        true
+    }
+
     fn push_activity(&mut self, event: &Event) -> bool {
         let activity = match Activity::parse(event) {
             Ok(activity) => activity,

crates/nip29/src/protocol.rs

@@ -43,7 +43,7 @@ fn has_tag(tags: &Tags, name: &str) -> bool {
     tags.iter().any(|tag| tag.kind() == name)
 }
 
-fn tag_value<'a>(tags: &'a Tags, name: &str) -> Option<&'a str> {
+pub(crate) fn tag_value<'a>(tags: &'a Tags, name: &str) -> Option<&'a str> {
     tags.iter()
         .find(|tag| tag.kind() == name)
         .and_then(|tag| tag.content())
@@ -98,6 +98,13 @@ impl GroupId {
             .kinds(MEMBERSHIP_KINDS)
     }
 
+    pub fn moderation_filter(&self, limit: usize) -> Filter {
+        Filter::new()
+            .custom_tag(SingleLetterTag::LOWERCASE_H, self.0.clone())
+            .kinds([Kind::GroupCreateInvite, Kind::GroupDeleteEvent])
+            .limit(limit)
+    }
+
     pub fn message(
         &self,
         content: &str,

crates/nip29_ui/src/invite.rs

@@ -1,78 +1,185 @@
 use anyhow::Result;
+use common::TimestampExt;
+use gpui::prelude::FluentBuilder;
 use gpui::{
-    App, AppContext, ClipboardItem, ParentElement, SharedString, Styled, WeakEntity, Window, div,
-    px,
+    App, AppContext, ClipboardItem, Entity, IntoElement, ParentElement, SharedString, Styled,
+    WeakEntity, Window, div, px,
 };
-use nip29::Group;
+use nip29::{Group, Invite};
 use nostr_sdk::prelude::SecretKey;
 use theme::{ActiveTheme, TextStyle, Typeset as _};
-use ui::dialog::DialogButtonProps;
+use ui::button::{Button, ButtonVariants};
 use ui::input::InputState;
 use ui::notification::Notification;
-use ui::{WindowExtension, v_flex};
+use ui::{Sizable, WindowExtension, h_flex, v_flex};
 
-use crate::util::field;
+use crate::util::{field, report};
 
 const CODE_LEN: usize = 12;
 
 pub(crate) fn open(group: WeakEntity<Group>, window: &mut Window, cx: &mut App) {
-    let code = SecretKey::generate().to_secret_hex();
-    let code: String = code.chars().take(CODE_LEN).collect();
-
     let input = cx.new(|cx| {
         InputState::new(window, cx)
             .placeholder("Invite code")
-            .default_value(code)
+            .default_value(random_code())
     });
 
     window.open_dialog(cx, move |this, _window, cx| {
-        let group = group.clone();
-        let input = input.clone();
+        this.max_h(px(600.))
+            .show_close(true)
+            .title("Invites")
+            .child(body(group.clone(), input.clone(), cx))
+    });
+}
 
-        this.width(px(420.))
-            .confirm()
-            .title("Invite link")
-            .button_props(
-                DialogButtonProps::default()
-                    .cancel_text("Cancel")
-                    .ok_text("Copy link"),
+fn random_code() -> String {
+    SecretKey::generate()
+        .to_secret_hex()
+        .chars()
+        .take(CODE_LEN)
+        .collect()
+}
+
+fn body(group: WeakEntity<Group>, input: Entity<InputState>, cx: &App) -> impl IntoElement {
+    let invites = group
+        .upgrade()
+        .map(|entity| entity.read(cx).invites().to_vec())
+        .unwrap_or_default();
+
+    v_flex()
+        .gap_3()
+        .text_style(TextStyle::Callout)
+        .child(
+            div()
+                .text_color(cx.theme().text_muted)
+                .child("Anyone with a code can ask to join. Revoking a code stops new joins, it doesn't remove anyone."),
+        )
+        .when(invites.is_empty(), |this| {
+            this.child(
+                div()
+                    .text_color(cx.theme().text_faint)
+                    .child("No active invites"),
+            )
+        })
+        .children(invites.iter().map(|invite| invite_row(group.clone(), invite, cx)))
+        .child(create_row(group, input, cx))
+}
+
+fn invite_row(group: WeakEntity<Group>, invite: &Invite, cx: &App) -> impl IntoElement {
+    let created = div()
+        .flex_shrink_0()
+        .text_style(TextStyle::Caption)
+        .text_color(cx.theme().text_faint)
+        .child(invite.created_at.to_ago());
+
+    h_flex()
+        .justify_between()
+        .gap_2()
+        .child(
+            h_flex()
+                .min_w_0()
+                .gap_2()
+                .items_center()
+                .child(
+                    div()
+                        .min_w_0()
+                        .truncate()
+                        .child(SharedString::from(invite.code.clone())),
+                )
+                .child(created),
         )
         .child(
-                v_flex().gap_3().child(
-                    div()
-                        .text_style(TextStyle::Callout)
-                        .text_color(cx.theme().text_muted)
-                        .child("Share the code with whoever should be able to join. The relay must accept it."),
+            h_flex()
+                .flex_shrink_0()
+                .gap_1()
+                .child(copy_button(&group, &invite.code))
+                .child(revoke_button(&group, invite.id, &invite.code)),
         )
-                .child(field("Code", &input, cx)),
-            )
-            .on_ok(move |_event, window, cx| {
-                let code = input.read(cx).value().trim().to_owned();
+}
 
-                if code.is_empty() {
-                    return false;
-                }
+fn copy_button(group: &WeakEntity<Group>, code: &str) -> Button {
+    let group = group.clone();
+    let code = code.to_owned();
 
-                let link = group
-                    .read_with(cx, |group, _cx| {
-                        group.metadata().and_then(|metadata| {
-                            metadata
-                                .naddr(group.key().relay(), Some(&code))
+    Button::new(SharedString::from(format!("invite-copy-{code}")))
+        .label("Copy")
+        .ghost()
+        .small()
+        .on_click(move |_event, window, cx| {
+            let Some(link) = group
+                .read_with(cx, |group, _cx| invite_link(group, &code))
                 .ok()
-                                .map(SharedString::from)
-                        })
-                    })
-                    .ok()
-                    .flatten();
-
-                let Some(link) = link else {
+                .flatten()
+            else {
                 window.push_notification(
                     Notification::error(
                         "The relay doesn't publish group details, so no invite link can be made",
                     ),
                     cx,
                 );
-                    return false;
+                return;
+            };
+
+            cx.write_to_clipboard(ClipboardItem::new_string(link));
+            window.push_notification(Notification::success("Invite link copied"), cx);
+        })
+}
+
+fn revoke_button(group: &WeakEntity<Group>, id: nostr_sdk::prelude::EventId, code: &str) -> Button {
+    let group = group.clone();
+
+    Button::new(SharedString::from(format!("invite-revoke-{code}")))
+        .label("Revoke")
+        .ghost()
+        .small()
+        .on_click(move |_event, window, cx| {
+            match group.update(cx, |group, cx| group.delete_event(id, cx)) {
+                Ok(task) => report(window, cx, task),
+                Err(error) => log::warn!("nip29: revoking an invite failed: {error}"),
+            }
+        })
+}
+
+fn create_row(group: WeakEntity<Group>, input: Entity<InputState>, cx: &App) -> impl IntoElement {
+    h_flex()
+        .items_end()
+        .gap_2()
+        .child(field("New code", &input, cx).flex_1())
+        .child(
+            Button::new("invite-create")
+                .label("Create & copy link")
+                .on_click(move |_event, window, cx| {
+                    create(group.clone(), input.clone(), window, cx);
+                }),
+        )
+}
+
+fn invite_link(group: &Group, code: &str) -> Option<String> {
+    group
+        .metadata()
+        .and_then(|metadata| metadata.naddr(group.key().relay(), Some(code)).ok())
+}
+
+fn create(group: WeakEntity<Group>, input: Entity<InputState>, window: &mut Window, cx: &mut App) {
+    let code = input.read(cx).value().trim().to_owned();
+
+    if code.is_empty() {
+        window.push_notification(Notification::error("The invite code is empty"), cx);
+        return;
+    }
+
+    let Some(link) = group
+        .read_with(cx, |group, _cx| invite_link(group, &code))
+        .ok()
+        .flatten()
+    else {
+        window.push_notification(
+            Notification::error(
+                "The relay doesn't publish group details, so no invite link can be made",
+            ),
+            cx,
+        );
+        return;
     };
 
     match group.update(cx, |group, cx| group.create_invite(&code, cx)) {
@@ -81,22 +188,17 @@ pub(crate) fn open(group: WeakEntity<Group>, window: &mut Window, cx: &mut App)
                 .spawn(cx, async move |cx| -> Result<()> {
                     if let Err(error) = task.await {
                         cx.update(|window, cx| {
-                                        window.push_notification(
-                                            Notification::error(error.to_string()),
-                                            cx,
-                                        );
+                            window.push_notification(Notification::error(error.to_string()), cx);
                         })?;
                         return Ok(());
                     }
 
                     cx.update(|window, cx| {
-                                    cx.write_to_clipboard(ClipboardItem::new_string(
-                                        link.to_string(),
-                                    ));
-                                    window.push_notification(
-                                        Notification::success("Invite link copied"),
-                                        cx,
-                                    );
+                        input.update(cx, |input, cx| {
+                            input.set_value("", window, cx);
+                        });
+                        cx.write_to_clipboard(ClipboardItem::new_string(link));
+                        window.push_notification(Notification::success("Invite link copied"), cx);
                     })?;
 
                     Ok(())
@@ -105,8 +207,4 @@ pub(crate) fn open(group: WeakEntity<Group>, window: &mut Window, cx: &mut App)
         }
         Err(error) => log::warn!("nip29: creating an invite failed: {error}"),
     }
-
-                true
-            })
-    });
 }

crates/nip29_ui/src/lib.rs

@@ -26,7 +26,7 @@ use ui::markdown::RenderedText;
 use ui::message::WelcomeMessage;
 use ui::notification::Notification;
 use ui::scroll::Scrollbar;
-use ui::{Disableable, Icon, IconName, Sizable, WindowExtension, h_flex, v_flex};
+use ui::{Disableable, Icon, IconName, Sizable, StyledExt, WindowExtension, h_flex, v_flex};
 use util::{attachment_name, display_name, opens_run, pin_label, report};
 
 mod details;
@@ -310,6 +310,8 @@ pub struct GroupPanel {
     group: WeakEntity<Group>,
     list_state: ListState,
     head: Option<EventId>,
+    /// The message the composer is replying to, if any.
+    reply_to: Option<EventId>,
     rendered_texts_by_id: BTreeMap<EventId, RenderedText>,
     input: Entity<TextareaState>,
     /// Uploaded, non-encrypted attachments waiting to be sent.
@@ -380,6 +382,7 @@ impl GroupPanel {
             group: group.downgrade(),
             list_state: ListState::new(count + 2, ListAlignment::Bottom, px(1024.)),
             head,
+            reply_to: None,
             rendered_texts_by_id: BTreeMap::new(),
             input,
             attachments: Vec::new(),
@@ -452,6 +455,20 @@ impl GroupPanel {
         });
     }
 
+    fn start_reply(&mut self, id: EventId, window: &mut Window, cx: &mut Context<Self>) {
+        self.reply_to = Some(id);
+        self.input.update(cx, |input, cx| {
+            input.focus(window, cx);
+        });
+        cx.notify();
+    }
+
+    fn cancel_reply(&mut self, cx: &mut Context<Self>) {
+        if self.reply_to.take().is_some() {
+            cx.notify();
+        }
+    }
+
     fn send(&mut self, window: &mut Window, cx: &mut Context<Self>) {
         let mut content = self.input.read(cx).value().trim().to_owned();
 
@@ -474,9 +491,11 @@ impl GroupPanel {
             return;
         }
 
+        let replies: Vec<EventId> = self.reply_to.take().into_iter().collect();
+
         let Ok(send) = self
             .group
-            .update(cx, |group, cx| group.send_message(&content, vec![], cx))
+            .update(cx, |group, cx| group.send_message(&content, replies, cx))
         else {
             return;
         };
@@ -911,6 +930,9 @@ impl GroupPanel {
             .w_full()
             .p_2()
             .gap_1()
+            .when_some(self.reply_to, |this, target| {
+                this.child(self.render_reply_target(target, cx))
+            })
             .children(self.render_attachments(cx))
             .child(
                 h_flex()
@@ -943,6 +965,73 @@ impl GroupPanel {
             .into_any_element()
     }
 
+    fn render_reply_target(&self, target: EventId, cx: &mut Context<Self>) -> AnyElement {
+        let context = self.group.upgrade().and_then(|entity| {
+            entity.read_with(cx, |group, cx| {
+                let message = group.message(target)?;
+                let persons = PersonRegistry::global(cx);
+                let author = persons.read(cx).get(&message.author, cx);
+                let line = message.content.lines().next().unwrap_or_default().trim();
+
+                Some((
+                    author.name(),
+                    SharedString::from(line.chars().take(80).collect::<String>()),
+                ))
+            })
+        });
+
+        let (author, snippet) = context.unwrap_or_else(|| {
+            (
+                SharedString::from("Message"),
+                SharedString::from(target.to_hex().chars().take(8).collect::<String>()),
+            )
+        });
+
+        h_flex()
+            .min_w_0()
+            .items_center()
+            .gap_1()
+            .px_2()
+            .py_1()
+            .rounded(px(control_radius()))
+            .bg(cx.theme().surface_raised)
+            .text_style(TextStyle::Caption)
+            .child(
+                div()
+                    .flex_shrink_0()
+                    .text_color(cx.theme().text_muted)
+                    .child("Replying to"),
+            )
+            .child(
+                div()
+                    .flex_shrink_0()
+                    .max_w(px(140.))
+                    .truncate()
+                    .font_semibold()
+                    .text_color(cx.theme().text)
+                    .child(author),
+            )
+            .child(
+                div()
+                    .min_w_0()
+                    .flex_1()
+                    .truncate()
+                    .text_color(cx.theme().text_faint)
+                    .child(snippet),
+            )
+            .child(
+                Button::new("cancel-reply")
+                    .icon(IconName::Close)
+                    .tooltip("Cancel reply")
+                    .ghost()
+                    .small()
+                    .on_click(cx.listener(|this, _event, _window, cx| {
+                        this.cancel_reply(cx);
+                    })),
+            )
+            .into_any_element()
+    }
+
     fn render_attachments(&self, cx: &mut Context<Self>) -> Vec<AnyElement> {
         self.attachments
             .iter()

crates/nip29_ui/src/message.rs

@@ -52,6 +52,9 @@ pub(crate) fn render(
         )
         .author(author.name())
         .timestamp(message.created_at.to_human_time())
+        .when_some(message.replies_to.first().copied(), |this, target| {
+            this.child(reply_context(target, &actions.group, cx))
+        })
         .child(content)
         .when(!message.media.is_empty(), |this| {
             this.child(media(&message.media, cx))
@@ -71,7 +74,17 @@ pub(crate) fn render(
         format!("message-menu-{}", id.to_hex()),
         row,
         move |menu, window, cx| {
-            let menu = menu.submenu("React", window, cx, {
+            let menu = menu
+                .item({
+                    let panel = panel.clone();
+
+                    PopupMenuItem::new("Reply").on_click(move |_event, _window, cx| {
+                        let _ = panel.update_in(cx, |panel, window, cx| {
+                            panel.start_reply(id, window, cx);
+                        });
+                    })
+                })
+                .submenu("React", window, cx, {
                     let group = group.clone();
                     let panel = panel.clone();
 
@@ -89,11 +102,9 @@ pub(crate) fn render(
 
                     PopupMenuItem::new(if pinned { "Unpin" } else { "Pin" }).on_click(
                         move |_event, _window, cx| {
-                            if let Err(error) = panel.update_in(cx, |panel, window, cx| {
+                            let _ = panel.update_in(cx, |panel, window, cx| {
                                 panel.toggle_pin(group.clone(), id, window, cx);
-                            }) {
-                                log::warn!("nip29: pinning a message failed: {error}");
-                            }
+                            });
                         },
                     )
                 })
@@ -102,11 +113,9 @@ pub(crate) fn render(
                     let panel = panel.clone();
 
                     PopupMenuItem::new("Delete message").on_click(move |_event, _window, cx| {
-                        if let Err(error) = panel.update_in(cx, |panel, window, cx| {
+                        let _ = panel.update_in(cx, |panel, window, cx| {
                             panel.delete_message(group.clone(), id, window, cx);
-                        }) {
-                            log::warn!("nip29: deleting a message failed: {error}");
-                        }
+                        });
                     })
                 })
         },
@@ -249,6 +258,58 @@ fn reaction_bar(reactions: &[Reaction], cx: &App) -> AnyElement {
         .into_any_element()
 }
 
+fn reply_context(target: EventId, group: &WeakEntity<Group>, cx: &App) -> AnyElement {
+    let context = group.upgrade().and_then(|entity| {
+        entity.read_with(cx, |group, cx| {
+            let message = group.message(target)?;
+            let persons = PersonRegistry::global(cx);
+            let author = persons.read(cx).get(&message.author, cx);
+            let line = message.content.lines().next().unwrap_or_default().trim();
+
+            Some((
+                author.name(),
+                SharedString::from(line.chars().take(80).collect::<String>()),
+            ))
+        })
+    });
+
+    let (author, snippet) = context.unwrap_or_else(|| {
+        (
+            SharedString::from("Message"),
+            SharedString::from("original not loaded"),
+        )
+    });
+
+    h_flex()
+        .min_w_0()
+        .gap_1()
+        .items_center()
+        .child(
+            Icon::new(IconName::Reply)
+                .small()
+                .text_color(cx.theme().text_faint),
+        )
+        .child(
+            div()
+                .flex_shrink_0()
+                .max_w(px(120.))
+                .truncate()
+                .font_semibold()
+                .text_style(TextStyle::Caption)
+                .text_color(cx.theme().text_muted)
+                .child(author),
+        )
+        .child(
+            div()
+                .min_w_0()
+                .truncate()
+                .text_style(TextStyle::Caption)
+                .text_color(cx.theme().text_faint)
+                .child(snippet),
+        )
+        .into_any_element()
+}
+
 fn media(media: &[SharedUri], cx: &App) -> AnyElement {
     if let [only] = media {
         return div()

crates/nip29_ui/src/metadata.rs

@@ -1,9 +1,20 @@
-use gpui::{App, AppContext, Entity, ParentElement, Styled, WeakEntity, Window, px};
-use nip29::{Group, GroupMetadata};
+use std::sync::Arc;
+
+use gpui::http_client::{AsyncBody, HttpClient};
+use gpui::prelude::FluentBuilder;
+use gpui::{
+    AnyElement, App, AppContext, Entity, IntoElement, ParentElement, SharedString, Styled,
+    WeakEntity, Window, div, px,
+};
+use nip29::{Group, GroupId, GroupMetadata};
+use nostr_sdk::prelude::RelayUrl;
+use theme::{ActiveTheme, TextStyle, Typeset as _};
+use ui::button::{Button, ButtonVariants};
 use ui::dialog::DialogButtonProps;
 use ui::input::InputState;
+use ui::notification::Notification;
 use ui::switch::Switch;
-use ui::{WindowExtension, v_flex};
+use ui::{Sizable, WindowExtension, h_flex, v_flex};
 
 use crate::util::field;
 
@@ -53,10 +64,40 @@ pub(crate) fn open(group: WeakEntity<Group>, window: &mut Window, cx: &mut App)
             .default_value(base.picture.clone().unwrap_or_default())
     });
 
+    let parent = cx.new(|cx| {
+        InputState::new(window, cx)
+            .placeholder("Parent group id, empty for a root group")
+            .default_value(
+                base.parent
+                    .as_ref()
+                    .map(|id| id.as_str().to_owned())
+                    .unwrap_or_default(),
+            )
+    });
+
+    let children = cx.new(|_cx| base.children.clone());
     let flags = cx.new(|_cx| Flags::of(&base));
+    let livekit = cx.new(|_cx| None);
+
+    if let Ok(relay) = group.read_with(cx, |group, _cx| group.key().relay().clone()) {
+        let http = cx.http_client();
+        let probe = cx.background_spawn(async move { probe_livekit(http, relay).await });
+        let livekit = livekit.clone();
+
+        cx.spawn(async move |cx| {
+            let supported = probe.await;
+
+            livekit.update(cx, |livekit, cx| {
+                *livekit = Some(supported);
+                cx.notify();
+            });
+        })
+        .detach();
+    }
 
     window.open_dialog(cx, move |this, _window, cx| {
         let current = *flags.read(cx);
+        let supported = *livekit.read(cx) != Some(false);
 
         this.confirm()
             .title("Edit Group")
@@ -71,6 +112,8 @@ pub(crate) fn open(group: WeakEntity<Group>, window: &mut Window, cx: &mut App)
                     .child(field("Name", &name, cx))
                     .child(field("About", &about, cx))
                     .child(field("Picture", &picture, cx))
+                    .child(field("Parent", &parent, cx))
+                    .child(children_section(&children, cx))
                     .child(
                         v_flex()
                             .gap(px(theme::SPACE))
@@ -105,9 +148,26 @@ pub(crate) fn open(group: WeakEntity<Group>, window: &mut Window, cx: &mut App)
                             .child(
                                 Switch::new("livekit")
                                     .label("LiveKit")
-                                    .description("Announce audio and video support.")
+                                    .description(if supported {
+                                        "Announce audio and video support."
+                                    } else {
+                                        "The relay doesn't announce LiveKit support."
+                                    })
                                     .checked(current.livekit)
-                                    .on_click(toggle(&flags, |flags| &mut flags.livekit)),
+                                    .on_click({
+                                        let flags = flags.clone();
+                                        let livekit = livekit.clone();
+
+                                        move |next, _window, cx| {
+                                            if *next && *livekit.read(cx) == Some(false) {
+                                                return;
+                                            }
+                                            flags.update(cx, |flags, cx| {
+                                                flags.livekit = *next;
+                                                cx.notify();
+                                            });
+                                        }
+                                    }),
                             ),
                     ),
             )
@@ -116,6 +176,8 @@ pub(crate) fn open(group: WeakEntity<Group>, window: &mut Window, cx: &mut App)
                 let name = name.clone();
                 let about = about.clone();
                 let picture = picture.clone();
+                let parent = parent.clone();
+                let children = children.clone();
                 let flags = flags.clone();
 
                 move |_event, window, cx| {
@@ -129,6 +191,40 @@ pub(crate) fn open(group: WeakEntity<Group>, window: &mut Window, cx: &mut App)
                     next.about = value(&about, cx);
                     next.picture = value(&picture, cx);
 
+                    match value(&parent, cx).map(GroupId::new) {
+                        Some(Ok(id)) => next.parent = Some(id),
+                        Some(Err(error)) => {
+                            window.push_notification(Notification::error(error.to_string()), cx);
+                            return false;
+                        }
+                        None => next.parent = None,
+                    }
+
+                    next.children = children.read(cx).clone();
+
+                    // The relay must reject these anyway; catch them early.
+                    if let Some(id) = &next.parent {
+                        let key = group
+                            .read_with(cx, |group, _cx| group.key().id().as_str().to_owned())
+                            .ok();
+
+                        if key.as_deref() == Some(id.as_str()) {
+                            window.push_notification(
+                                Notification::error("A group can't be its own parent"),
+                                cx,
+                            );
+                            return false;
+                        }
+
+                        if next.children.iter().any(|child| child == id) {
+                            window.push_notification(
+                                Notification::error("The parent is one of this group's children"),
+                                cx,
+                            );
+                            return false;
+                        }
+                    }
+
                     let current = flags.read(cx);
                     next.private = current.private;
                     next.restricted = current.restricted;
@@ -147,6 +243,88 @@ pub(crate) fn open(group: WeakEntity<Group>, window: &mut Window, cx: &mut App)
     });
 }
 
+/// NIP-29: relays announce LiveKit support with a 204 at this well-known path.
+async fn probe_livekit(http: Arc<dyn HttpClient>, relay: RelayUrl) -> bool {
+    let base = relay
+        .as_str()
+        .replacen("wss://", "https://", 1)
+        .replacen("ws://", "http://", 1);
+    let url = format!("{}/.well-known/nip29/livekit", base.trim_end_matches('/'));
+
+    match http.get(&url, AsyncBody::default(), true).await {
+        Ok(response) => response.status() == 204,
+        Err(_) => false,
+    }
+}
+
+fn children_section(children: &Entity<Vec<GroupId>>, cx: &App) -> AnyElement {
+    let list = children.read(cx);
+
+    let mut section = v_flex()
+        .gap_1()
+        .text_style(TextStyle::Callout)
+        .text_color(cx.theme().text_muted)
+        .child("Children");
+
+    if list.is_empty() {
+        return section
+            .child(
+                div()
+                    .text_color(cx.theme().text_faint)
+                    .child("No subgroups"),
+            )
+            .into_any_element();
+    }
+
+    for (ix, child) in list.iter().enumerate() {
+        let order = h_flex()
+            .flex_shrink_0()
+            .gap_1()
+            .when(ix > 0, |this| {
+                this.child(move_button(children.clone(), ix, ix - 1, "up"))
+            })
+            .when(ix + 1 < list.len(), |this| {
+                this.child(move_button(children.clone(), ix, ix + 1, "down"))
+            });
+
+        section = section.child(
+            h_flex()
+                .justify_between()
+                .gap_2()
+                .child(
+                    div()
+                        .min_w_0()
+                        .truncate()
+                        .text_color(cx.theme().text)
+                        .child(SharedString::from(child.as_str().to_owned())),
+                )
+                .child(order),
+        );
+    }
+
+    section.into_any_element()
+}
+
+fn move_button(
+    children: Entity<Vec<GroupId>>,
+    ix: usize,
+    target: usize,
+    direction: &'static str,
+) -> Button {
+    Button::new(SharedString::from(format!("child-{direction}-{ix}")))
+        .label(if direction == "up" { "Up" } else { "Down" })
+        .ghost()
+        .small()
+        .on_click(move |_event, _window, cx| {
+            children.update(cx, |children, cx| {
+                if target < children.len() {
+                    children.swap(ix, target);
+                    cx.notify();
+                }
+            });
+        })
+}
+
 fn toggle(
     flags: &Entity<Flags>,
     select: fn(&mut Flags) -> &mut bool,

docs/nip29-comparison.md

@@ -16,12 +16,12 @@ trade-offs; each has real gaps the other closed.
   timeline refs, membership-from-9000/9001 (the spec's "implementation
   quirks" section), and fork/migration detection via admins' `kind:10009`.
   nostord implements none of those three.
-- nostord is ahead on product surface: invite code listing/revocation, full
-  LiveKit AV (token endpoint + `kind:39004`), threads UI, subgroup hierarchy
-  management, member rosters as a membership source.
-- Spec bugs in ours worth fixing: no `39002`/`39001` fallback for
-  membership. (Since this comparison: `duplicate:` join rejection, 9008
-  delete-group and reaction aggregation were implemented.)
+- nostord is ahead on product surface: full LiveKit AV (token endpoint +
+  `kind:39004`) and a threads pane. Invite code management, subgroup
+  reparent/reorder and reply chips landed here since the comparison.
+- Spec bugs in ours worth fixing: none open. The `duplicate:` join
+  rejection, 9008 delete-group, reaction aggregation and the `39002`/`39001`
+  membership fallback were implemented.
 
 ## 1. Protocol compliance vs NIP-29
 
@@ -32,7 +32,7 @@ trade-offs; each has real gaps the other closed.
 | **9008 delete-group** | yes, plus confirm dialog | yes |
 | **9010 update-pin-list + 39005** | send + parse + UI | stub ("disabled until the pinning backend exists") |
 | `previous` tag (last 50 seen, excl. self, ≥3 × 8 chars) | `TimelineWindow` (`crates/nip29/src/protocol.rs`) | not built, not validated |
-| Membership = latest of own 9000/9001 | `Membership::from_events` | derived from 39001/39002 rosters + local markers instead |
+| Membership = latest of own 9000/9001 | `Membership::from_events`, rosters resolve `Unknown` as fallback | derived from 39001/39002 rosters + local markers instead |
 | Join request `code` tag / `naddr1…?invite=` | `GroupReference::parse` | yes, plus legacy formats (`wss://host'id`, `?relay=&group=`) |
 | `duplicate:` 9021 rejection = already member | treated as success (`mark_member`) | matched by wording, treated as success |
 | 39000 metadata: all flags + `supported_kinds` + `parent`/`child` | yes, plus banner and content-JSON fallback | yes, minus banner; tags only |
@@ -85,30 +85,30 @@ waits for AUTH explicitly before REQs; both work on auth-gating relays.
 
 ### P2 — client-parity features
 
-4. **Invite management.** We create a 9009 code and copy the link, but never
-   subscribe to 9009, so there is no list of active codes and no revoke
-   (nostord: active codes = 9009 minus 9005 revocations, per-code copy and
-   revoke). Natural fit: add 9009 to the group's state subscription and an
-   "Invites" section in the details dialog.
-5. **Membership fallback to rosters.** We only derive membership from
-   9000/9001. If a relay prunes moderation history (or the user was added
-   without us seeing the 9000), membership shows `Unknown` while 39002 lists
-   us. Consider nostord's "external add" adoption: own pubkey in 39001/39002
-   → treat as member (or invite card), without weakening the 9000/9001
-   override.
-6. **LiveKit.** The flag is parsed and editable, but joining an AV group does
-   nothing. At minimum: the `/.well-known/nip29/livekit` probe (204) to gate
-   the toggle, and the token flow
-   (`/.well-known/nip29/livekit/<id>` with NIP-98 kind 27235 plus a 39004
-   participant subscription) if AV is on the roadmap.
-7. **Subgroup management UI.** `parent` is set at creation (`CreateChannel`),
-   and `edit_metadata` already carries `parent`/`child` tags, but the edit
-   dialog cannot reparent or reorder children (the spec's 9002 child-list
-   replace semantics). nostord has a full Hierarchy tab (move under / make
-   root / reorder). Nothing reads NIP-11 `nip29.subgroups` to gate the UI.
-8. **No reply/thread UI.** `send_message` accepts `replies` but
-   `GroupPanel::send` always passes empty; kind 11/1111 render inline only.
-   nostord has reply chips, a threads pane, and NIP-22 tag nesting.
+4. ~~**Invite management.**~~ **done.** The group subscription now includes a
+   moderation filter (`9009` + `9005`, `GroupId::moderation_filter`),
+   `Group::invites()` exposes active codes (revocations arrive as 9005
+   deletions and via the publisher's own `Sent` path), and the invite dialog
+   lists codes with per-code copy-link and revoke.
+5. ~~**Membership fallback to rosters.**~~ **done.** `Group::
+   adopt_roster_membership`: while the latest own 9000/9001 leaves membership
+   `Unknown`, being listed in 39001/39002 counts as `Member`. `Pending`,
+   `Refused` and `Removed` are never overridden.
+6. **LiveKit — partially done.** The edit dialog probes
+   `/.well-known/nip29/livekit` (expecting 204) and gates the toggle with a
+   description when the relay doesn't announce support. Remaining: the token
+   flow (`/.well-known/nip29/livekit/<id>` with NIP-98 kind 27235) and a
+   `kind:39004` participant subscription — both only useful once an AV
+   client is on the roadmap.
+7. ~~**Subgroup management UI.**~~ **done.** The edit dialog has a Parent
+   field (empty = root; reparenting) and a children list with Up/Down
+   reordering (the spec's 9002 child-list replace semantics). Self-parent and
+   parent-is-child are rejected client-side; NIP-11 `nip29.subgroups` is not
+   read yet.
+8. **Reply UI — partially done.** The composer can target a reply
+   (context menu → Reply, chip with cancel), sends kind 11 with `e` tags, and
+   messages render a reply-context line (author + first line) resolved from
+   loaded rows. Remaining: a dedicated threads pane (nostord has one).
 
 ### P3 — polish
 
@@ -129,8 +129,9 @@ waits for AUTH explicitly before REQs; both work on auth-gating relays.
 1. ~~Fix `duplicate:`-prefix handling on 9021~~ done.
 2. ~~Exclude/aggregate kind-7 reactions in group rows~~ done.
 3. ~~Add 9008 delete-group + confirm dialog~~ done.
-4. Subscribe 9009 → invite list + revoke via 9005 (medium).
-5. 39002/39001 membership fallback (medium).
-6. Subgroup reparent/reorder in the edit dialog (medium, uses the existing
-   9002 path).
-7. LiveKit probe + token flow (larger; only if AV is in scope).
+4. ~~Subscribe 9009 → invite list + revoke via 9005~~ done.
+5. ~~39002/39001 membership fallback~~ done.
+6. ~~Subgroup reparent/reorder in the edit dialog~~ done.
+7. LiveKit probe (done, gates the toggle) + token flow (larger; only if AV is
+   in scope).
+8. Reply sending + chips (done); a dedicated threads pane remains.