Add basic end-to-bridge encryption support

Still missing persisting sync tokens and crypto state in DB

database/statestore.go

@@ -90,6 +90,24 @@ func (store *SQLStateStore) GetRoomMembers(roomID id.RoomID) map[id.UserID]*even
 	return members
 }
 
+func (store *SQLStateStore) GetRoomMemberList(roomID id.RoomID) (members []id.UserID, err error) {
+	var rows *sql.Rows
+	rows, err = store.db.Query("SELECT user_id FROM mx_user_profile WHERE room_id=$1", roomID)
+	if err != nil {
+		return
+	}
+	for rows.Next() {
+		var userID id.UserID
+		err := rows.Scan(&userID)
+		if err != nil {
+			store.log.Warnfln("Failed to scan member in %s: %v", roomID, err)
+		} else {
+			members = append(members, userID)
+		}
+	}
+	return
+}
+
 func (store *SQLStateStore) GetMembership(roomID id.RoomID, userID id.UserID) event.Membership {
 	row := store.db.QueryRow("SELECT membership FROM mx_user_profile WHERE room_id=$1 AND user_id=$2", roomID, userID)
 	membership := event.MembershipLeave
@@ -118,6 +136,26 @@ func (store *SQLStateStore) TryGetMember(roomID id.RoomID, userID id.UserID) (*e
 	return &member, err == nil
 }
 
+func (store *SQLStateStore) FindSharedRooms(userID id.UserID) (rooms []id.RoomID) {
+	rows, err := store.db.Query(`
+			SELECT room_id FROM mx_user_profile WHERE user_id=$2 AND portal.encrypted=true
+			LEFT JOIN portal WHEN portal.mxid=mx_user_profile.room_id`, userID)
+	if err != nil {
+		store.log.Warnfln("Failed to query shared rooms with %s: %v", userID, err)
+		return
+	}
+	for rows.Next() {
+		var roomID id.RoomID
+		err := rows.Scan(&roomID)
+		if err != nil {
+			store.log.Warnfln("Failed to scan room ID: %v", err)
+		} else {
+			rooms = append(rooms, roomID)
+		}
+	}
+	return
+}
+
 func (store *SQLStateStore) IsInRoom(roomID id.RoomID, userID id.UserID) bool {
 	return store.IsMembership(roomID, userID, "join")
 }