crypto: Calculate sender data for incoming sessions

Author: andybalaam

crates/matrix-sdk-crypto/src/machine.rs

@@ -66,7 +66,8 @@ use crate::{
     identities::{user::UserIdentities, Device, IdentityManager, UserDevices},
     olm::{
         Account, CrossSigningStatus, EncryptionSettings, IdentityKeys, InboundGroupSession,
-        OlmDecryptionInfo, PrivateCrossSigningIdentity, SenderData, SessionType, StaticAccountData,
+        OlmDecryptionInfo, PrivateCrossSigningIdentity, SenderDataFinder, SessionType,
+        StaticAccountData,
     },
     requests::{IncomingResponse, OutgoingRequest, UploadSigningKeysRequest},
     session_manager::{GroupSessionManager, SessionManager},
@@ -809,7 +810,7 @@ impl OlmMachine {
         event: &DecryptedRoomKeyEvent,
         content: &MegolmV1AesSha2Content,
     ) -> OlmResult<Option<InboundGroupSession>> {
-        let sender_data = SenderData::unknown();
+        let sender_data = SenderDataFinder::find(self, sender_key, event, content).await?;
 
         let session = InboundGroupSession::new(
             sender_key,

crates/matrix-sdk-crypto/src/olm/group_sessions/mod.rs

@@ -18,13 +18,15 @@ use serde::{Deserialize, Serialize};
 mod inbound;
 mod outbound;
 mod sender_data;
+mod sender_data_finder;
 
 pub use inbound::{InboundGroupSession, PickledInboundGroupSession};
 pub(crate) use outbound::ShareState;
 pub use outbound::{
     EncryptionSettings, OutboundGroupSession, PickledOutboundGroupSession, ShareInfo,
 };
 pub use sender_data::{SenderData, SenderDataRetryDetails};
+pub(crate) use sender_data_finder::SenderDataFinder;
 use thiserror::Error;
 pub use vodozemac::megolm::{ExportedSessionKey, SessionKey};
 use vodozemac::{megolm::SessionKeyDecodeError, Curve25519PublicKey};