From 67b3fdc4f0d4b164dc6c3abc4d0ba85f388d0f14 Mon Sep 17 00:00:00 2001
From: William Grant <me@williamgrant.id.au>
Date: Sat, 19 Mar 2011 21:41:52 +1100
Subject: [PATCH] Port dkimsign.py.

---
 dkimsign.py | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

diff --git a/dkimsign.py b/dkimsign.py
index a17fbc8..5060240 100644
--- a/dkimsign.py
+++ b/dkimsign.py
@@ -3,11 +3,11 @@
 # This software is provided 'as-is', without any express or implied
 # warranty.  In no event will the author be held liable for any damages
 # arising from the use of this software.
-# 
+#
 # Permission is granted to anyone to use this software for any purpose,
 # including commercial applications, and to alter it and redistribute it
 # freely, subject to the following restrictions:
-# 
+#
 # 1. The origin of this software must not be misrepresented; you must not
 #    claim that you wrote the original software. If you use this software
 #    in a product, an acknowledgment in the product documentation would be
@@ -15,30 +15,40 @@
 # 2. Altered source versions must be plainly marked as such, and must not be
 #    misrepresented as being the original software.
 # 3. This notice may not be removed or altered from any source distribution.
-# 
+#
 # Copyright (c) 2008 Greg Hewgill http://hewgill.com
+#
+# This has been modified from the original software.
+# Copyright (c) 2011 William Grant <me@williamgrant.id.au>
+
+from __future__ import print_function
 
 import sys
 
 import dkim
 
 if len(sys.argv) < 4 or len(sys.argv) > 5:
-    print >>sys.stderr, "Usage: dkimsign.py selector domain privatekeyfile [identity]"
+    print("Usage: dkimsign.py selector domain privatekeyfile [identity]", file=sys.stderr)
     sys.exit(1)
 
-selector = sys.argv[1]
-domain = sys.argv[2]
+if sys.version_info[0] >= 3:
+    # Make sys.stdin and stdout binary streams.
+    sys.stdin = sys.stdin.detach()
+    sys.stdout = sys.stdout.detach()
+
+selector = sys.argv[1].encode('utf-8')
+domain = sys.argv[2].encode('utf-8')
 privatekeyfile = sys.argv[3]
 if len(sys.argv) > 5:
-    identity = sys.argv[4]
+    identity = sys.argv[4].encode('utf-8')
 else:
     identity = None
 
 message = sys.stdin.read()
 try:
-    sig = dkim.sign(message, selector, domain, open(privatekeyfile, "r").read(), identity = identity)
+    sig = dkim.sign(message, selector, domain, open(privatekeyfile, "rb").read(), identity = identity)
     sys.stdout.write(sig)
     sys.stdout.write(message)
-except Exception, e:
-    print >>sys.stderr, e
+except Exception as e:
+    print(e, file=sys.stderr)
     sys.stdout.write(message)