S2S: In Follow handler for sharer inbox, support following of sharer tickets

src/Vervis/Federation/Offer.hs

@@ -374,17 +374,31 @@ sharerFollowF shr =
         objRoute
         (SharerR shr)
         getRecip
-        personInbox
-        personOutbox
-        personFollowers
+        (personInbox . fst)
+        (personOutbox . fst)
+        followers
         (SharerOutboxItemR shr)
     where
-    objRoute (SharerR shr') | shr == shr' = Just ()
+    objRoute (SharerR shr')
+        | shr == shr' = Just Nothing
+    objRoute (SharerTicketR shr' talkhid)
+        | shr == shr' = Just $ Just talkhid
     objRoute _ = Nothing
 
-    getRecip () = do
+    getRecip mtalkhid = do
         sid <- getKeyBy404 $ UniqueSharer shr
-        getValBy404 $ UniquePersonIdent sid
+        Entity pid p <- getBy404 $ UniquePersonIdent sid
+        mt <- for mtalkhid $ \ talkhid -> do
+            talid <- decodeKeyHashid404 talkhid
+            tal <- get404 talid
+            unless (ticketAuthorLocalAuthor tal == pid) notFound
+            mtup <- getBy $ UniqueTicketUnderProjectAuthor talid
+            unless (isNothing mtup) notFound
+            getJust $ ticketAuthorLocalTicket tal
+        return (p, mt)
+
+    followers (p, Nothing)  = personFollowers p
+    followers (_, Just lt)  = localTicketFollowers lt
 
 projectFollowF
     :: ShrIdent