2 files changed, 48 insertions, 0 deletions

diff --git a/src/mailman_pgp/chains/__init__.py b/src/mailman_pgp/chains/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/mailman_pgp/chains/__init__.py
diff --git a/src/mailman_pgp/chains/default.py b/src/mailman_pgp/chains/default.py
new file mode 100644
index 0000000..27ee190
--- /dev/null
+++ b/src/mailman_pgp/chains/default.py
@@ -0,0 +1,48 @@
+# Copyright (C) 2017 Jan Jancar
+#
+# This file is a part of the Mailman PGP plugin.
+#
+# This program 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, either version 3 of the License, or (at your option)
+# any later version.
+#
+# This program 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
+# this program.  If not, see <http://www.gnu.org/licenses/>.
+
+""""""
+from mailman.chains.base import Link
+from mailman.core.i18n import _
+from mailman.interfaces.chain import IChain, LinkAction
+from public import public
+from zope.interface import implementer
+
+
+@public
+@implementer(IChain)
+class EncryptedChain:
+    """Default encrypted chain."""
+
+    name = 'encrypted-posting-chain'
+    description = _('The encrypted moderation chain.')
+
+    _link_descriptions = (
+        ('signature', LinkAction.jump, 'moderation'),
+        ('truth', LinkAction.jump, 'default-posting-chain')
+    )
+
+    def __init__(self):
+        self._cached_links = None
+
+    def get_links(self, mlist, msg, msgdata):
+        """See `IChain`."""
+        if self._cached_links is None:
+            self._cached_links = links = []
+            for rule, action, chain in self._link_descriptions:
+                links.append(Link(rule, action, chain))
+        return iter(self._cached_links)