crypto: Add a fixme to the sqlite store since it's not storing forwarding chains.

matrix_sdk_crypto/src/olm/group_sessions.rs

@@ -162,6 +162,7 @@ impl InboundGroupSession {
             sender_key: self.sender_key.to_string(),
             signing_key: self.signing_key.to_string(),
             room_id: (&*self.room_id).clone(),
+            forwarding_chains: self.forwarding_chains.lock().await.clone(),
         }
     }
 
@@ -189,7 +190,7 @@ impl InboundGroupSession {
             sender_key: Arc::new(pickle.sender_key),
             signing_key: Arc::new(pickle.signing_key),
             room_id: Arc::new(pickle.room_id),
-            forwarding_chains: Arc::new(Mutex::new(None)),
+            forwarding_chains: Arc::new(Mutex::new(pickle.forwarding_chains)),
         })
     }
 
@@ -292,6 +293,9 @@ pub struct PickledInboundGroupSession {
     pub signing_key: String,
     /// The id of the room that the session is used in.
     pub room_id: RoomId,
+    /// The list of claimed ed25519 that forwarded us this key. Will be None if
+    /// we dirrectly received this session.
+    pub forwarding_chains: Option<Vec<String>>,
 }
 
 /// The typed representation of a base64 encoded string of the GroupSession pickle.

matrix_sdk_crypto/src/store/sqlite.rs

@@ -399,6 +399,9 @@ impl SqliteStore {
                     sender_key,
                     signing_key,
                     room_id: RoomId::try_from(room_id)?,
+                    // Fixme we need to store/restore these once we get support
+                    // for key requesting/forwarding.
+                    forwarding_chains: None,
                 };
 
                 Ok(InboundGroupSession::from_pickle(
@@ -791,6 +794,10 @@ impl CryptoStore for SqliteStore {
         let mut connection = self.connection.lock().await;
         let session_id = session.session_id();
 
+        // FIXME we need to store/restore the forwarding chains.
+        // FIXME this should be converted so it accepts an array of sessions for
+        // the key import feature.
+
         query(
             "INSERT INTO inbound_group_sessions (
                 session_id, account_id, sender_key, signing_key,