[openpgp] Port to Gtk4

openpgp/backend/base.py

@@ -0,0 +1,97 @@
+# Copyright (C) 2025 Philipp Hörist <philipp AT hoerist.com>
+#
+# This file is part of the OpenPGP Gajim Plugin.
+#
+# OpenPGP Gajim Plugin is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published
+# by the Free Software Foundation; version 3 only.
+#
+# OpenPGP Gajim Plugin is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with OpenPGP Gajim Plugin. If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import annotations
+
+from typing import Any
+from typing import TYPE_CHECKING
+
+from collections.abc import Sequence
+from pathlib import Path
+
+from nbxmpp.protocol import JID
+
+if TYPE_CHECKING:
+    from openpgp.modules.key_store import KeyData
+
+
+class BaseKeyringItem:
+    def __init__(self, key: Any) -> None:
+        self._key = key
+        self._uid = self._get_uid()
+
+    @property
+    def is_xmpp_key(self) -> bool:
+        try:
+            return self.jid is not None
+        except Exception:
+            return False
+
+    def is_valid(self, jid: JID) -> bool:
+        if not self.is_xmpp_key:
+            return False
+        return jid == self.jid
+
+    def _get_uid(self) -> str | None:
+        raise NotImplementedError
+
+    @property
+    def fingerprint(self) -> str:
+        raise NotImplementedError
+
+    @property
+    def uid(self):
+        if self._uid is not None:
+            return self._uid
+
+    @property
+    def jid(self) -> JID | None:
+        if self._uid is not None:
+            return JID.from_string(self._uid)
+
+    def __hash__(self):
+        return hash(self.fingerprint)
+
+
+class BasePGPBackend:
+    def __init__(self, jid: str, gnupghome: Path) -> None:
+        raise NotImplementedError
+
+    def generate_key(self) -> None:
+        raise NotImplementedError
+
+    def encrypt(
+        self, payload: bytes, keys: list[KeyData]
+    ) -> tuple[bytes | None, str | None]:
+        raise NotImplementedError
+
+    def decrypt(self, payload: bytes) -> tuple[str, str]:
+        raise NotImplementedError
+
+    def get_keys(self) -> Sequence[BaseKeyringItem]:
+        raise NotImplementedError
+
+    def import_key(self, data: bytes, jid: JID) -> BaseKeyringItem | None:
+        raise NotImplementedError
+
+    def get_own_key_details(self) -> tuple[str | None, int | None]:
+        raise NotImplementedError
+
+    def export_key(self, fingerprint: str) -> bytes | None:
+        raise NotImplementedError
+
+    def delete_key(self, fingerprint: str) -> None:
+        raise NotImplementedError