[feature] keymanager: background update keys

Port of the original commit:
8f1fe8dd4a54fd2bdda2fc78c339ce9b3d0fc331
by Zara Gebru that introduced updating keys in the background.

This was made in the legacy leapcode/keymanager repo, but was lost in
the merge to the unified bitmask-dev.

Original commit message follows:
--------------------------------

- refresh random key in random time
- add get key by fingerprint
- refactor nicknym methods to own file
- tests

- note this do not include a check for
revoked key, since that need some changes
in gnupg

- Related: #6089

1 files changed, 22 insertions, 0 deletions

diff --git a/src/leap/bitmask/keymanager/keys.py b/src/leap/bitmask/keymanager/keys.py
index 45a7d72..1b236c3 100644
--- a/src/leap/bitmask/keymanager/keys.py
+++ b/src/leap/bitmask/keymanager/keys.py
@@ -272,6 +272,28 @@ class OpenPGPKey(object):
             self.address,
             "priv" if self.private else "publ")
 
+    def is_active(self):
+        """
+        Indicates if a key is active.
+        :return: True if key is active.
+        :rtype: bool
+        """
+        return True if self.address is not None else False
+
+    def set_unactive(self):
+        """
+        Sets a key as unactive.
+        """
+        self.address = None
+
+    def is_expired(self):
+        """
+        Indicates if a key is expired.
+        :return: True if key expired.
+        :rtype: bool
+        """
+        return False if self.expiry_date is None else self.expiry_date < datetime.now()
+
 
 def parse_address(address):
     """