Add KWallet support. By @samuel-w (#540)

flatpak/com.borgbase.Vorta.json

@@ -16,6 +16,7 @@
         "--talk-name=org.freedesktop.DBus.*",
         "--talk-name=org.freedesktop.Flatpak.*",
         "--talk-name=org.freedesktop.secrets",
+        "--talk-name=org.kde.kwalletd5",
         "--socket=ssh-auth",
         "--talk-name=org.freedesktop.Notifications",
         "--system-talk-name=org.freedesktop.NetworkManager"

src/vorta/keyring/abc.py

@@ -36,14 +36,17 @@ def get_keyring():
     if _keyring is None or not _keyring.is_primary:
         if sys.platform == 'darwin':  # Use Keychain on macOS
             from .darwin import VortaDarwinKeyring
-            return VortaDarwinKeyring()
+            _keyring = VortaDarwinKeyring()
         else:  # Try to use DBus and Gnome-Keyring (available on Linux and *BSD)
             import secretstorage
             from .secretstorage import VortaSecretStorageKeyring
             try:
                 _keyring = VortaSecretStorageKeyring()
-            # Save passwords in DB, if all else fails.
-            except secretstorage.SecretServiceNotAvailableException:
-                from .db import VortaDBKeyring
-                _keyring = VortaDBKeyring()
+            except secretstorage.SecretServiceNotAvailableException:  # Try to use KWallet
+                from .kwallet import VortaKWallet5Keyring, KWalletNotAvailableException
+                try:
+                    _keyring = VortaKWallet5Keyring()
+                except KWalletNotAvailableException:  # Save passwords in DB, if all else fails.
+                    from .db import VortaDBKeyring
+                    _keyring = VortaDBKeyring()
     return _keyring

src/vorta/keyring/kwallet.py

@@ -0,0 +1,56 @@
+from PyQt5 import QtDBus
+from PyQt5.QtCore import QVariant
+from vorta.keyring.abc import VortaKeyring
+
+
+class VortaKWallet5Keyring(VortaKeyring):
+    """A wrapper for the qtdbus package to support the custom keyring backend"""
+
+    folder_name = 'Vorta'
+    service_name = "org.kde.kwalletd5"
+    object_path = "/modules/kwalletd5"
+    interface_name = 'org.kde.KWallet'
+
+    def __init__(self):
+        """
+        Test whether DBus and KDEWallet are available.
+        """
+        self.iface = QtDBus.QDBusInterface(
+            self.service_name,
+            self.object_path,
+            self.interface_name,
+            QtDBus.QDBusConnection.sessionBus())
+        if not (self.iface.isValid() and self.get_result("isEnabled")):
+            raise KWalletNotAvailableException
+
+    def set_password(self, service, repo_url, password):
+        self.get_result("writePassword", args=[self.handle, self.folder_name, repo_url, password, service])
+
+    def get_password(self, service, repo_url):
+        if not (self.is_unlocked and self.get_result("hasEntry",
+                                                     args=[self.handle, self.folder_name, repo_url, service])):
+            return None
+        return self.get_result("readPassword", args=[self.handle, self.folder_name, repo_url, service])
+
+    def get_result(self, method, args=[]):
+        if args:
+            result = self.iface.callWithArgumentList(QtDBus.QDBus.AutoDetect, method, args)
+        else:
+            result = self.iface.call(QtDBus.QDBus.AutoDetect, method)
+        return result.arguments()[0]
+
+    @property
+    def is_unlocked(self):
+        self.get_handle()
+        return self.handle > 0
+
+    def get_handle(self):
+        wallet_name = self.get_result("networkWallet")
+        wId = QVariant(0)
+        wId.convert(4)
+        output = self.get_result("open", args=[wallet_name, wId, 'vorta-repo'])
+        self.handle = int(output)
+
+
+class KWalletNotAvailableException(Exception):
+    pass