1 files changed, 71 insertions, 0 deletions

diff --git a/src/mailman_pgp/config/converter.py b/src/mailman_pgp/config/converter.py
new file mode 100644
index 0000000..e3cdb90
--- /dev/null
+++ b/src/mailman_pgp/config/converter.py
@@ -0,0 +1,71 @@
+# 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/>.
+
+"""Config conversion."""
+import builtins
+import re
+from configparser import ConfigParser
+
+from mailman.utilities.modules import find_name
+
+
+class ConfigConverter:
+    """Converts a ConfigParser object values according to a schema."""
+
+    def __init__(self, schema):
+        self.schema = ConfigParser()
+        self.schema.read_string(schema)
+
+    def convert(self, cfg):
+        """
+
+        :param cfg:
+        :type cfg: ConfigParser
+        """
+        out = dict()
+        for section in self.schema.sections():
+            out[section] = dict()
+            for option in self.schema.options(section):
+                out[section][option] = self._transform_option(section, option,
+                                                              cfg.get(section,
+                                                                      option))
+        return out
+
+    def converter(self, section, option):
+        schema = self.schema.get(section, option)
+        call = None
+        try:
+            call = getattr(builtins, schema)
+        except:
+            try:
+                call = find_name(schema)
+            except:
+                if len(schema) != 0:
+                    def call(value):
+                        match = re.search(schema, value)
+                        if match is None:
+                            raise ValueError
+                        return match.group()
+        return call
+
+    def _transform_option(self, section, option, value):
+        call = self.converter(section, option)
+
+        if call is None:
+            raise ValueError
+        else:
+            return call(value)