sync broadcast secret for multidevice

src/chat.rs

@@ -3777,7 +3777,8 @@ pub async fn create_group_ex(
 /// Returns the created chat's id.
 pub async fn create_broadcast(context: &Context, chat_name: String) -> Result<ChatId> {
     let grpid = create_id();
-    create_broadcast_ex(context, Sync, grpid, chat_name).await
+    let secret = create_broadcast_shared_secret();
+    create_broadcast_ex(context, Sync, grpid, chat_name, secret).await
 }
 
 pub(crate) async fn create_broadcast_ex(
@@ -3785,6 +3786,7 @@ pub(crate) async fn create_broadcast_ex(
     sync: sync::Sync,
     grpid: String,
     chat_name: String,
+    secret: String,
 ) -> Result<ChatId> {
     let row_id = {
         let chat_name = &chat_name;
@@ -3813,6 +3815,13 @@ pub(crate) async fn create_broadcast_ex(
                     create_smeared_timestamp(context),
                 ),
             )?;
+            let chat_id = t.last_insert_rowid();
+            // TODO code duplication of `INSERT INTO broadcasts_shared_secrets`
+            t.execute(
+                "INSERT INTO broadcasts_shared_secrets (chat_id, secret) VALUES (?, ?)
+                ON CONFLICT(chat_id) DO UPDATE SET secret=excluded.chat_id",
+                (chat_id, &secret),
+            )?;
             Ok(t.last_insert_rowid().try_into()?)
         };
         context.sql.transaction(trans_fn).await?
@@ -3824,7 +3833,7 @@ pub(crate) async fn create_broadcast_ex(
 
     if sync.into() {
         let id = SyncId::Grpid(grpid);
-        let action = SyncAction::CreateBroadcast(chat_name);
+        let action = SyncAction::CreateBroadcast { chat_name, secret };
         self::sync(context, id, action).await.log_err(context).ok();
     }
 
@@ -5036,7 +5045,10 @@ pub(crate) enum SyncAction {
     SetVisibility(ChatVisibility),
     SetMuted(MuteDuration),
     /// Create broadcast channel with the given name.
-    CreateBroadcast(String),
+    CreateBroadcast {
+        chat_name: String,
+        secret: String,
+    },
     Rename(String),
     /// Set chat contacts by their addresses.
     SetContacts(Vec<String>),
@@ -5099,8 +5111,15 @@ impl Context {
                     .id
             }
             SyncId::Grpid(grpid) => {
-                if let SyncAction::CreateBroadcast(name) = action {
-                    create_broadcast_ex(self, Nosync, grpid.clone(), name.clone()).await?;
+                if let SyncAction::CreateBroadcast { chat_name, secret } = action {
+                    create_broadcast_ex(
+                        self,
+                        Nosync,
+                        grpid.clone(),
+                        chat_name.clone(),
+                        secret.to_string(),
+                    )
+                    .await?;
                     return Ok(());
                 }
                 get_chat_id_by_grpid(self, grpid)
@@ -5123,7 +5142,7 @@ impl Context {
             SyncAction::Accept => chat_id.accept_ex(self, Nosync).await,
             SyncAction::SetVisibility(v) => chat_id.set_visibility_ex(self, Nosync, *v).await,
             SyncAction::SetMuted(duration) => set_muted_ex(self, Nosync, chat_id, *duration).await,
-            SyncAction::CreateBroadcast(_) => {
+            SyncAction::CreateBroadcast { .. } => {
                 Err(anyhow!("sync_alter_chat({id:?}, {action:?}): Bad request."))
             }
             SyncAction::Rename(to) => rename_ex(self, Nosync, chat_id, to).await,

src/chat/chat_tests.rs

@@ -3860,12 +3860,25 @@ async fn test_sync_name() -> Result<()> {
     let a0_broadcast_id = create_broadcast(alice0, "Channel".to_string()).await?;
     sync(alice0, alice1).await;
     let a0_broadcast_chat = Chat::load_from_db(alice0, a0_broadcast_id).await?;
+
     set_chat_name(alice0, a0_broadcast_id, "Broadcast channel 42").await?;
-    sync(alice0, alice1).await;
+    //sync(alice0, alice1).await; // crash
+
+    let sent = alice0.pop_sent_msg().await;
+    let rcvd = alice1.recv_msg(&sent).await;
+    assert_eq!(rcvd.from_id, ContactId::SELF);
+    assert_eq!(rcvd.to_id, ContactId::SELF);
+    assert_eq!(
+        rcvd.text,
+        "You changed group name from \"Channel\" to \"Broadcast channel 42\"."
+    );
+    assert_eq!(rcvd.param.get_cmd(), SystemMessage::GroupNameChanged);
     let a1_broadcast_id = get_chat_id_by_grpid(alice1, &a0_broadcast_chat.grpid)
         .await?
         .unwrap()
         .0;
+    assert_eq!(rcvd.chat_id, a1_broadcast_id);
+
     let a1_broadcast_chat = Chat::load_from_db(alice1, a1_broadcast_id).await?;
     assert_eq!(a1_broadcast_chat.get_type(), Chattype::OutBroadcast);
     assert_eq!(a1_broadcast_chat.get_name(), "Broadcast channel 42");

src/param.rs

@@ -175,7 +175,7 @@ pub enum Param {
     /// For Chats of type [`Chattype::OutBroadcast`] and [`Chattype::InBroadcast`]: // TODO (or just OutBroadcast)
     /// The symmetric key shared among all chat participants,
     /// used to encrypt and decrypt messages.
-    SymmetricKey = b'z',
+    SymmetricKey = b'z', // TODO remove this again
 
     /// For Contacts: If this is the List-Post address of a mailing list, contains
     /// the List-Id of the mailing list (which is also used as the group id of the chat).

src/qr.rs

@@ -381,6 +381,7 @@ pub fn format_backup(qr: &Qr) -> Result<String> {
 
 /// scheme: `OPENPGP4FPR:FINGERPRINT#a=ADDR&n=NAME&i=INVITENUMBER&s=AUTH`
 ///     or: `OPENPGP4FPR:FINGERPRINT#a=ADDR&g=GROUPNAME&x=GROUPID&i=INVITENUMBER&s=AUTH`
+///     or: `OPENPGP4FPR:FINGERPRINT#a=ADDR&c=CHANNELNAME&x=CHANNELID&s=SHAREDSECRET`
 ///     or: `OPENPGP4FPR:FINGERPRINT#a=ADDR`
 async fn decode_openpgp(context: &Context, qr: &str) -> Result<Qr> {
     let payload = qr

src/receive_imf.rs

@@ -3477,8 +3477,22 @@ async fn apply_out_broadcast_changes(
     chat: &mut Chat,
     from_id: ContactId,
 ) -> Result<GroupChangesInfo> {
+    // TODO code duplication with apply_in_broadcast_changes()
     ensure!(chat.typ == Chattype::OutBroadcast);
 
+    let mut send_event_chat_modified = false;
+    let mut better_msg = None;
+
+    apply_chat_name_and_avatar_changes(
+        context,
+        mime_parser,
+        from_id,
+        chat,
+        &mut send_event_chat_modified,
+        &mut better_msg,
+    )
+    .await?;
+
     if let Some(_removed_addr) = mime_parser.get_header(HeaderDef::ChatGroupMemberRemoved) {
         // The sender of the message left the broadcast channel
         remove_from_chat_contacts_table(context, chat.id, from_id).await?;
@@ -3491,7 +3505,16 @@ async fn apply_out_broadcast_changes(
         });
     }
 
-    Ok(GroupChangesInfo::default())
+    if send_event_chat_modified {
+        context.emit_event(EventType::ChatModified(chat.id));
+        chatlist_events::emit_chatlist_item_changed(context, chat.id);
+    }
+    Ok(GroupChangesInfo {
+        better_msg,
+        added_removed_id: None,
+        silent: false,
+        extra_msgs: vec![],
+    })
 }
 
 async fn apply_in_broadcast_changes(