Move get_email_charset to this module

1 files changed, 50 insertions, 0 deletions

diff --git a/src/leap/common/mail.py b/src/leap/common/mail.py
new file mode 100644
index 0000000..2f2146d
--- /dev/null
+++ b/src/leap/common/mail.py
@@ -0,0 +1,50 @@
+# -*- coding: utf-8 -*-
+# mail.py
+# Copyright (C) 2013 LEAP
+#
+# 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/>.
+"""
+Utility functions for email.
+"""
+import email
+import re
+
+from leap.common.check import leap_assert_type
+
+
+def get_email_charset(content, default="utf-8"):
+    """
+    Mini parser to retrieve the charset of an email.
+
+    :param content: mail contents
+    :type content: unicode
+    :param default: optional default value for encoding
+    :type default: str or None
+
+    :returns: the charset as parsed from the contents
+    :rtype: str
+    """
+    leap_assert_type(content, unicode)
+
+    charset = default
+    try:
+        em = email.message_from_string(content.encode("utf-8", "replace"))
+        # Miniparser for: Content-Type: <something>; charset=<charset>
+        charset_re = r'''charset=(?P<charset>[\w|\d|-]*)'''
+        charset = re.findall(charset_re, em["Content-Type"])[0]
+        if charset is None or len(charset) == 0:
+            charset = default
+    except Exception:
+        pass
+    return charset