From 6030ef859c93c6472443e0221bfcdc9c8a3466ce Mon Sep 17 00:00:00 2001
From: kyleknap <kyleknap@amazon.com>
Date: Wed, 10 Sep 2014 14:42:47 -0700
Subject: Fix bug where headers were presigned incorrectly.

For Sigv4 urls, custom metadata headers were not being presigned correctly.
---
 boto/auth.py                     |  4 ++++
 tests/unit/s3/test_connection.py | 20 ++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/boto/auth.py b/boto/auth.py
index df8dcccd..0d42dd52 100644
--- a/boto/auth.py
+++ b/boto/auth.py
@@ -705,6 +705,10 @@ class S3HmacAuthV4Handler(HmacAuthV4Handler, AuthHandler):
         if self._provider.security_token:
             params['X-Amz-Security-Token'] = self._provider.security_token
 
+        headers_to_sign = self.headers_to_sign(req)
+        l = sorted(['%s' % n.lower().strip() for n in headers_to_sign])
+        params['X-Amz-SignedHeaders'] = ';'.join(l)
+ 
         req.params.update(params)
 
         cr = self.canonical_request(req)
diff --git a/tests/unit/s3/test_connection.py b/tests/unit/s3/test_connection.py
index 35ebce97..5839a6a2 100644
--- a/tests/unit/s3/test_connection.py
+++ b/tests/unit/s3/test_connection.py
@@ -135,6 +135,26 @@ class TestSigV4Presigned(MockServiceWithConfigTestCase):
         self.assertIn('VersionId=2', url)
         self.assertIn('X-Amz-Security-Token=token', url)
 
+    def test_sigv4_presign_headers(self):
+        self.config = {
+            's3': {
+                'use-sigv4': True,
+            }
+        }
+
+        conn = self.connection_class(
+            aws_access_key_id='less',
+            aws_secret_access_key='more',
+            host='s3.amazonaws.com'
+        )
+
+        headers = {'x-amz-meta-key': 'val'}
+        url = conn.generate_url_sigv4(86400, 'GET', bucket='examplebucket',
+                                      key='test.txt', headers=headers)
+
+        self.assertIn('host', url)
+        self.assertIn('x-amz-meta-key', url)
+
 
 class TestUnicodeCallingFormat(AWSMockServiceTestCase):
     connection_class = S3Connection
-- 
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