Basic `key sign` command implementation.

1 files changed, 57 insertions, 0 deletions

diff --git a/src/mailman_pgp/database/types.py b/src/mailman_pgp/database/types.py
new file mode 100644
index 0000000..e86fb9f
--- /dev/null
+++ b/src/mailman_pgp/database/types.py
@@ -0,0 +1,57 @@
+# 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 public import public
+from sqlalchemy import Integer, TypeDecorator
+
+
+@public
+class EnumFlag(TypeDecorator):
+    """Simple bitwise flag from an `enum.Enum`, assumes it is unique."""
+    impl = Integer
+
+    def __init__(self, enum, *args, **kw):
+        super().__init__(*args, **kw)
+        self.enum = enum
+
+    def process_bind_param(self, value, dialect):
+        # value is a set/frozenset of Enums.
+        if value is None:
+            return None
+        if not isinstance(value, (set, frozenset)):
+            raise ValueError
+
+        int_value = 0
+        for enum in reversed(self.enum):
+            int_value = int_value << 1
+            if enum in value:
+                int_value += 1
+
+        return int_value
+
+    def process_result_value(self, value, dialect):
+        # value is an integer.
+        if value is None:
+            return None
+        if value == 0:
+            return frozenset()
+        result = set()
+        for enum in self.enum:
+            if value % 2 == 1:
+                result.add(enum)
+            value = value >> 1
+
+        return frozenset(result)