From 41b840a6b6f17afc8f6b9a28c5fa223f7fc24fc5 Mon Sep 17 00:00:00 2001
From: Fabien Boucher <fabien.boucher@enovance.com>
Date: Fri, 29 Mar 2013 18:03:51 +0100
Subject: [PATCH] Add a swift middleware Last-Modified.

---
 middlewares/last_modified.py | 68 ++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 middlewares/last_modified.py

diff --git a/middlewares/last_modified.py b/middlewares/last_modified.py
new file mode 100644
index 0000000..a038052
--- /dev/null
+++ b/middlewares/last_modified.py
@@ -0,0 +1,68 @@
+# Copyright (c) 2013 OpenStack, LLC.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import time
+from swift.common.utils import get_logger
+from swift.common.swob import Request, wsgify
+
+
+class LastModified(object):
+    """
+    """
+
+    def __init__(self, app, conf):
+        self.app = app
+        self.conf = conf
+        self.logger = get_logger(self.conf, log_route='last_modified')
+
+    def update_last_modified_meta(self, req, env):
+        vrs, account, container, obj = req.split_path(1, 4, True)
+        if obj:
+            env['PATH_INFO'] = env['PATH_INFO'].split('/%s' % obj)[0]
+        env['REQUEST_METHOD'] = 'POST'
+        headers = {'X-Container-Meta-Last-Modified': str(time.time())}
+        set_meta_req = Request.blank(env['PATH_INFO'],
+                                     headers=headers,
+                                     environ=env)
+        return set_meta_req.get_response(self.app)
+
+    def req_passthrough(self, req):
+        return req.get_response(self.app)
+
+    @wsgify
+    def __call__(self, req):
+        vrs, account, container, obj = req.split_path(1, 4, True)
+        if req.method in ('POST', 'PUT') and container or \
+         req.method == 'DELETE' and obj:
+            new_env = req.environ.copy()
+            user_resp = self.req_passthrough(req)
+            if user_resp.status_int // 100 == 2:
+                # Update Container Meta Last-Modified in case of
+                # successful request
+                update_resp = self.update_last_modified_meta(req,
+                                                             new_env)
+                if update_resp.status_int // 100 != 2:
+                    self.logger.info('Unable to update Meta Last-Modified')
+            return user_resp
+        return self.app
+
+
+def filter_factory(global_conf, **local_conf):
+    conf = global_conf.copy()
+    conf.update(local_conf)
+
+    def last_modified_filter(app):
+        return LastModified(app, conf)
+    return last_modified_filter