crypto: Store the forwarding chains for group sessions.

matrix_sdk_crypto/src/store/sqlite.rs

@@ -261,7 +261,24 @@ impl SqliteStore {
                 UNIQUE(session_id, algorithm)
             );
 
-            CREATE INDEX IF NOT EXISTS "group_session_claimed_keys_session_id" ON "inbound_group_sessions" ("session_id");
+            CREATE INDEX IF NOT EXISTS "group_session_claimed_keys_session_id" ON "group_session_claimed_keys" ("session_id");
+        "#,
+            )
+            .await?;
+
+        connection
+            .execute(
+                r#"
+            CREATE TABLE IF NOT EXISTS group_session_chains (
+                "id" INTEGER NOT NULL PRIMARY KEY,
+                "key" TEXT NOT NULL,
+                "session_id" INTEGER NOT NULL,
+                FOREIGN KEY ("session_id") REFERENCES "inbound_group_sessions" ("id")
+                    ON DELETE CASCADE
+                UNIQUE(session_id, key)
+            );
+
+            CREATE INDEX IF NOT EXISTS "group_session_chains_session_id" ON "group_session_chains" ("session_id");
         "#,
             )
             .await?;
@@ -527,14 +544,26 @@ impl SqliteStore {
                 })
                 .collect();
 
+            let mut chain_rows: Vec<(String,)> =
+                query_as("SELECT key, key FROM group_session_chains WHERE session_id = ?")
+                    .bind(session_row_id)
+                    .fetch_all(&mut *connection)
+                    .await?;
+
+            let chains: Vec<String> = chain_rows.drain(..).map(|r| r.0).collect();
+
+            let chains = if chains.is_empty() {
+                None
+            } else {
+                Some(chains)
+            };
+
             let pickle = PickledInboundGroupSession {
                 pickle: InboundGroupSessionPickle::from(pickle),
                 sender_key,
                 signing_key: claimed_keys,
                 room_id: RoomId::try_from(room_id)?,
-                // Fixme we need to store/restore these once we get support
+                forwarding_chains: chains,
-                // for key requesting/forwarding.
-                forwarding_chains: None,
                 imported,
             };
 
@@ -805,10 +834,6 @@ impl SqliteStore {
         let pickle = session.pickle(self.get_pickle_mode()).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(
             "REPLACE INTO inbound_group_sessions (
                 session_id, account_id, sender_key,
@@ -839,7 +864,7 @@ impl SqliteStore {
 
         for (key_id, key) in pickle.signing_key {
             query(
-                "INSERT OR IGNORE INTO group_session_claimed_keys (
+                "REPLACE INTO group_session_claimed_keys (
                     session_id, algorithm, key
                  ) VALUES (?1, ?2, ?3)
                  ",
@@ -851,6 +876,21 @@ impl SqliteStore {
             .await?;
         }
 
+        if let Some(chains) = pickle.forwarding_chains {
+            for key in chains {
+                query(
+                    "REPLACE INTO group_session_chains (
+                        session_id, key
+                     ) VALUES (?1, ?2)
+                     ",
+                )
+                .bind(session_row_id)
+                .bind(key)
+                .execute(&mut *connection)
+                .await?;
+            }
+        }
+
         Ok(())
     }
 
@@ -1606,7 +1646,7 @@ mod test {
 
     #[tokio::test]
     async fn load_inbound_group_session() {
-        let (account, store, _dir) = get_loaded_store().await;
+        let (account, store, dir) = get_loaded_store().await;
 
         let identity_keys = account.identity_keys();
         let outbound_session = OlmOutboundGroupSession::new();
@@ -1618,11 +1658,22 @@ mod test {
         )
         .expect("Can't create session");
 
+        let mut export = session.export().await;
+
+        export.forwarding_curve25519_key_chain = vec!["some_chain".to_owned()];
+
+        let session = InboundGroupSession::from_export(export).unwrap();
+
         store
             .save_inbound_group_sessions(&[session.clone()])
             .await
             .expect("Can't save group session");
 
+        let store = SqliteStore::open(&alice_id(), &alice_device_id(), dir.path())
+            .await
+            .expect("Can't create store");
+
+        store.load_account().await.unwrap();
         store.load_inbound_group_sessions().await.unwrap();
 
         let loaded_session = store
@@ -1631,6 +1682,8 @@ mod test {
             .unwrap()
             .unwrap();
         assert_eq!(session, loaded_session);
+        let export = loaded_session.export().await;
+        assert!(!export.forwarding_curve25519_key_chain.is_empty())
     }
 
     #[tokio::test]