Add libsecret backend

keyring/backends/libsecret.py

@@ -0,0 +1,161 @@
+import logging
+
+from ..util import properties
+from ..backend import KeyringBackend
+from ..credentials import SimpleCredential
+from ..errors import (
+    PasswordDeleteError,
+    PasswordSetError,
+    ExceptionRaisedContext,
+    KeyringLocked,
+)
+
+available = False
+try:
+    import gi
+    from gi.repository import Gio
+    from gi.repository import GLib
+
+    gi.require_version('Secret', '1')
+    from gi.repository import Secret
+
+    available = True
+except (AttributeError, ImportError, ValueError):
+    pass
+
+log = logging.getLogger(__name__)
+
+
+class Keyring(KeyringBackend):
+    """libsecret Keyring"""
+
+    appid = 'Python keyring library'
+    if available:
+        schema = Secret.Schema.new(
+            "org.freedesktop.Secret.Generic",
+            Secret.SchemaFlags.NONE,
+            {
+                "application": Secret.SchemaAttributeType.STRING,
+                "service": Secret.SchemaAttributeType.STRING,
+                "username": Secret.SchemaAttributeType.STRING,
+            },
+        )
+
+    @properties.ClassProperty
+    @classmethod
+    def priority(cls):
+        with ExceptionRaisedContext() as exc:
+            Secret.__name__
+        if exc:
+            raise RuntimeError("libsecret required")
+        return 5
+
+    def get_password(self, service, username):
+        """Get password of the username for the service"""
+        attributes = {
+            "application": self.appid,
+            "service": service,
+            "username": username,
+        }
+        try:
+            items = Secret.password_search_sync(
+                self.schema, attributes, Secret.SearchFlags.UNLOCK, None
+            )
+        except GLib.Error as error:
+            quark = GLib.quark_try_string('g-io-error-quark')
+            if error.matches(quark, Gio.IOErrorEnum.FAILED):
+                raise KeyringLocked('Failed to unlock the item!') from error
+            raise
+        for item in items:
+            try:
+                return item.retrieve_secret_sync().get_text()
+            except GLib.Error as error:
+                quark = GLib.quark_try_string('secret-error')
+                if error.matches(quark, Secret.Error.IS_LOCKED):
+                    raise KeyringLocked('Failed to unlock the item!') from error
+                raise
+
+    def set_password(self, service, username, password):
+        """Set password for the username of the service"""
+        collection = Secret.COLLECTION_DEFAULT
+        attributes = {
+            "application": self.appid,
+            "service": service,
+            "username": username,
+        }
+        label = "Password for '{}' on '{}'".format(username, service)
+        try:
+            stored = Secret.password_store_sync(
+                self.schema, attributes, collection, label, password, None
+            )
+        except GLib.Error as error:
+            quark = GLib.quark_try_string('secret-error')
+            if error.matches(quark, Secret.Error.IS_LOCKED):
+                raise KeyringLocked("Failed to unlock the collection!") from error
+            quark = GLib.quark_try_string('g-io-error-quark')
+            if error.matches(quark, Gio.IOErrorEnum.FAILED):
+                raise KeyringLocked("Failed to unlock the collection!") from error
+            raise
+        if not stored:
+            raise PasswordSetError("Failed to store password!")
+
+    def delete_password(self, service, username):
+        """Delete the stored password (only the first one)"""
+        attributes = {
+            "application": self.appid,
+            "service": service,
+            "username": username,
+        }
+        try:
+            items = Secret.password_search_sync(
+                self.schema, attributes, Secret.SearchFlags.UNLOCK, None
+            )
+        except GLib.Error as error:
+            quark = GLib.quark_try_string('g-io-error-quark')
+            if error.matches(quark, Gio.IOErrorEnum.FAILED):
+                raise KeyringLocked('Failed to unlock the item!') from error
+            raise
+        for item in items:
+            try:
+                removed = Secret.password_clear_sync(
+                    self.schema, item.get_attributes(), None
+                )
+            except GLib.Error as error:
+                quark = GLib.quark_try_string('secret-error')
+                if error.matches(quark, Secret.Error.IS_LOCKED):
+                    raise KeyringLocked('Failed to unlock the item!') from error
+                raise
+            return removed
+        raise PasswordDeleteError("No such password!")
+
+    def get_credential(self, service, username):
+        """Get the first username and password for a service.
+        Return a Credential instance
+
+        The username can be omitted, but if there is one, it will use get_password
+        and return a SimpleCredential containing  the username and password
+        Otherwise, it will return the first username and password combo that it finds.
+        """
+        query = {"service": service}
+        if username:
+            query["username"] = username
+        try:
+            items = Secret.password_search_sync(
+                self.schema, query, Secret.SearchFlags.UNLOCK, None
+            )
+        except GLib.Error as error:
+            quark = GLib.quark_try_string('g-io-error-quark')
+            if error.matches(quark, Gio.IOErrorEnum.FAILED):
+                raise KeyringLocked('Failed to unlock the item!') from error
+            raise
+        for item in items:
+            username = item.get_attributes().get("username")
+            try:
+                return SimpleCredential(
+                    username, item.retrieve_secret_sync().get_text()
+                )
+            except GLib.Error as error:
+                quark = GLib.quark_try_string('secret-error')
+                if error.matches(quark, Secret.Error.IS_LOCKED):
+                    raise KeyringLocked('Failed to unlock the item!') from error
+                raise

setup.cfg

@@ -63,6 +63,7 @@ devpi_client =
 keyring.backends =
 	Windows = keyring.backends.Windows
 	macOS = keyring.backends.macOS
+	libsecret = keyring.backends.libsecret
 	SecretService = keyring.backends.SecretService
 	KWallet = keyring.backends.kwallet
 	chainer = keyring.backends.chainer

tests/backends/test_libsecret.py

@@ -0,0 +1,30 @@
+import pytest
+
+from keyring.testing.backend import BackendBasicTests
+from keyring.testing.util import NoNoneDictMutator
+from keyring.backends import libsecret
+
+
+@pytest.mark.skipif(
+    not libsecret.Keyring.viable,
+    reason="libsecret package is needed for LibSecretKeyring",
+)
+class TestLibSecretKeyring(BackendBasicTests):
+    __test__ = True
+
+    def init_keyring(self):
+        print(
+            "Testing LibSecretKeyring; the following "
+            "password prompts are for this keyring"
+        )
+        keyring = libsecret.Keyring()
+        return keyring
+
+
+class TestUnits:
+    def test_supported_no_libsecret(self):
+        """
+        LibSecretKeyring is not viable if Secret can't be imported.
+        """
+        with NoNoneDictMutator(libsecret.__dict__, Secret=None):
+            assert not libsecret.Keyring.viable