add vendoring

vendor/gitlab.com/etke.cc/linkpearl/store/state.go

@@ -0,0 +1,63 @@
+package store
+
+import (
+	"database/sql"
+	"encoding/json"
+
+	"maunium.net/go/mautrix/event"
+	"maunium.net/go/mautrix/id"
+)
+
+// NOTE: functions in that file are for crypto.StateStore implementation
+// ref: https://pkg.go.dev/maunium.net/go/mautrix/crypto#StateStore
+
+// GetEncryptionEvent returns the encryption event's content for an encrypted room.
+func (s *Store) GetEncryptionEvent(roomID id.RoomID) *event.EncryptionEventContent {
+	if !s.encryption {
+		return nil
+	}
+	s.log.Debug("finding encryption event of %s", roomID)
+	query := "SELECT encryption_event FROM rooms WHERE room_id = $1"
+	row := s.db.QueryRow(query, roomID)
+
+	var encryptionEventJSON []byte
+	err := row.Scan(&encryptionEventJSON)
+	if err != nil && err != sql.ErrNoRows {
+		s.log.Error("cannot find encryption event: %v", err)
+		return nil
+	}
+	var encryptionEvent event.EncryptionEventContent
+	if err := json.Unmarshal(encryptionEventJSON, &encryptionEvent); err != nil {
+		s.log.Debug("cannot unmarshal encryption event: %s", err)
+		return nil
+	}
+
+	return &encryptionEvent
+}
+
+// FindSharedRooms returns the encrypted rooms that another user is also in for a user ID.
+func (s *Store) FindSharedRooms(userID id.UserID) []id.RoomID {
+	if !s.encryption {
+		return nil
+	}
+	s.log.Debug("loading shared rooms for %s", userID)
+	query := "SELECT room_id FROM room_members WHERE user_id = $1"
+	rows, queryErr := s.db.Query(query, userID)
+	rooms := make([]id.RoomID, 0)
+	if queryErr != nil {
+		s.log.Error("cannot load room members: %s", queryErr)
+		return rooms
+	}
+	defer rows.Close()
+
+	var roomID id.RoomID
+	for rows.Next() {
+		scanErr := rows.Scan(&roomID)
+		if scanErr != nil {
+			continue
+		}
+		rooms = append(rooms, roomID)
+	}
+
+	return rooms
+}