From 7cc9808b47ba766091070fa1540170c2705023b6 Mon Sep 17 00:00:00 2001
From: Andrew Engelbrecht <sudoman@ninthfloor.org>
Date: Tue, 19 Jul 2016 14:48:01 -0400
Subject: [PATCH] basic testing for auto-reply messages

this should prevent some auto-response feedback loops.
---
 edward              | 32 ++++++++++++++++++++++++++++++--
 tests/flatten-9.eml | 11 +++++++++++
 tests/flatten-9.out |  1 +
 3 files changed, 42 insertions(+), 2 deletions(-)
 create mode 100644 tests/flatten-9.eml
 create mode 100644 tests/flatten-9.out

diff --git a/edward b/edward
index ed47182..fc099d8 100755
--- a/edward
+++ b/edward
@@ -267,11 +267,13 @@ def main ():
 
     print_reply_only = handle_args()
 
+    email_bytes = sys.stdin.buffer.read()
+
+    test_auto_reply(email_bytes)
+
     gpgme_ctx = get_gpg_context(edward_config.gnupghome,
                               edward_config.sign_with_key)
 
-    email_bytes = sys.stdin.buffer.read()
-
     # do this twice so sigs can be verified with newly imported keys
     parse_pgp_mime(email_bytes, gpgme_ctx)
     email_struct = parse_pgp_mime(email_bytes, gpgme_ctx)
@@ -1243,6 +1245,32 @@ def is_key_usable (key_obj):
         return False
 
 
+def test_auto_reply (email_bytes):
+    """Test whether email is auto-generated
+
+    If the email is autogenerated, edward quits without sending a response.
+    This is not a perfect test. Some auto-responses will go undetected.
+
+    Args:
+        email_bytes: the byte string from of the email
+
+    Returns:
+        Nothing, or exits the program
+    """
+
+    email_struct = email.parser.BytesHeaderParser().parsebytes(email_bytes)
+
+    auto_submitted = email_struct['Auto-Submitted']
+
+    if auto_submitted == None or auto_submitted == "no" \
+            or auto_submitted == "No":
+
+        return
+
+    debug("autoreply")
+    exit(0)
+
+
 def email_to_reply_to_subject (email_bytes):
     """Returns the email's To:, Reply-To: (or From:), and Subject: fields
 
diff --git a/tests/flatten-9.eml b/tests/flatten-9.eml
new file mode 100644
index 0000000..bbc8963
--- /dev/null
+++ b/tests/flatten-9.eml
@@ -0,0 +1,11 @@
+From - Tue Jul 19 14:09:15 2016
+To: noone@localhost
+Subject: auto-response test
+Auto-Submitted: auto-replied
+From: No One <noone@localhost>
+Date: Tue, 19 Jul 2016 14:09:14 -0400
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 7bit
+
+test
+
diff --git a/tests/flatten-9.out b/tests/flatten-9.out
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/tests/flatten-9.out
@@ -0,0 +1 @@
+
-- 
2.25.1