agent: getConnLinkPrivKey (#1759)

src/Simplex/Messaging/Agent.hs

@@ -64,6 +64,7 @@ module Simplex.Messaging.Agent
     setConnShortLink,
     deleteConnShortLink,
     getConnShortLink,
+    getConnLinkPrivKey,
     deleteLocalInvShortLink,
     changeConnectionUser,
     prepareConnectionToJoin,
@@ -428,6 +429,10 @@ getConnShortLink :: AgentClient -> NetworkRequestMode -> UserId -> ConnShortLink
 getConnShortLink c = withAgentEnv c .:. getConnShortLink' c
 {-# INLINE getConnShortLink #-}
 
+getConnLinkPrivKey :: AgentClient -> ConnId -> AE (Maybe C.PrivateKeyEd25519)
+getConnLinkPrivKey c = withAgentEnv c . getConnLinkPrivKey' c
+{-# INLINE getConnLinkPrivKey #-}
+
 -- | This irreversibly deletes short link data, and it won't be retrievable again
 deleteLocalInvShortLink :: AgentClient -> ConnShortLink 'CMInvitation -> AE ()
 deleteLocalInvShortLink c = withAgentEnv c . deleteLocalInvShortLink' c
@@ -1087,6 +1092,14 @@ deleteConnShortLink' c nm connId cMode =
       (RcvConnection _ rq, SCMInvitation) -> deleteQueueLink c nm rq
       _ -> throwE $ CMD PROHIBITED "deleteConnShortLink: not contact address"
 
+getConnLinkPrivKey' :: AgentClient -> ConnId -> AM (Maybe C.PrivateKeyEd25519)
+getConnLinkPrivKey' c connId = do
+  SomeConn _ conn <- withStore c (`getConn` connId)
+  pure $ case conn of
+    ContactConnection _ rq -> linkPrivSigKey <$> shortLink rq
+    RcvConnection _ rq -> linkPrivSigKey <$> shortLink rq
+    _ -> Nothing
+
 -- TODO [short links] remove 1-time invitation data and link ID from the server after the message is sent.
 getConnShortLink' :: forall c. AgentClient -> NetworkRequestMode -> UserId -> ConnShortLink c -> AM (FixedLinkData c, ConnLinkData c)
 getConnShortLink' c nm userId = \case