[feat] Validate signature with attachments

- Create a new Generator that doesn't trim the headers
- Extract detached signature from message
- Convert message to the body an attachments level
- Add coment to the generator workaround and shows which python version
  has the patch

1 files changed, 21 insertions, 0 deletions

diff --git a/src/leap/mail/generator.py b/src/leap/mail/generator.py
new file mode 100644
index 0000000..28db8da
--- /dev/null
+++ b/src/leap/mail/generator.py
@@ -0,0 +1,21 @@
+from email.generator import Generator as EmailGenerator
+
+class Generator(EmailGenerator):
+    """
+    Generates output from a Message object tree, keeping signatures.
+
+    This code was extracted from Mailman.Generator.Generator, version 2.1.4:
+
+    Most other Generator will be created not setting the foldheader flag,
+    as we do not overwrite clone(). The original clone() does not
+    set foldheaders.
+
+    So you need to set foldheaders if you want the toplevel to fold headers
+
+    TODO: Python 3.3 is patched against this problems. See issue 1590744 on python bug tracker.
+    """
+    def _write_headers(self, msg):
+        for h, v in msg.items():
+            print >> self._fp, '%s:' % h,
+            print >> self._fp, v
+        print >> self._fp