From 5436e4fea87bb1c4e9db11bc444f82e3d3753fbd Mon Sep 17 00:00:00 2001
From: Fabien Meghazi <fme@openerp.com>
Date: Mon, 18 Jun 2012 17:47:10 +0200
Subject: [PATCH] [ADD] Added support for ETag in Binary#image [REM] Removed
 kanban hack using Date#getDate() in url

bzr revid: fme@openerp.com-20120618154710-luw8bt50bjtdlj7t
---
 addons/web/controllers/main.py            | 23 +++++++++++++++++++----
 addons/web_kanban/static/src/js/kanban.js |  4 ----
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index 8203efc969e..2966b34ab19 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -1331,19 +1331,34 @@ class Binary(openerpweb.Controller):
 
     @openerpweb.httprequest
     def image(self, req, model, id, field, **kw):
+        last_update = '__last_update'
         Model = req.session.model(model)
         context = req.session.eval_context(req.context)
+        headers = [('Content-Type', 'image/png')]
+        etag = req.httprequest.headers.get('If-None-Match')
+        hashed_session = hashlib.md5(req.session_id).hexdigest()
+        if etag:
+            if not id and hashed_session == etag:
+                return werkzeug.wrappers.Response(status=304)
+            else:
+                date = Model.read([int(id)], [last_update], context)[0].get(last_update)
+                if hashlib.md5(date).hexdigest() == etag:
+                    return werkzeug.wrappers.Response(status=304)
 
+        retag = hashed_session
         try:
             if not id:
                 res = Model.default_get([field], context).get(field)
+                image_data = base64.b64decode(res)
             else:
-                res = Model.read([int(id)], [field], context)[0].get(field)
-            image_data = base64.b64decode(res)
+                res = Model.read([int(id)], [last_update, field], context)[0]
+                retag = hashlib.md5(res.get(last_update)).hexdigest()
+                image_data = base64.b64decode(res.get(field))
         except (TypeError, xmlrpclib.Fault):
             image_data = self.placeholder(req)
-        return req.make_response(image_data, [
-            ('Content-Type', 'image/png'), ('Content-Length', len(image_data))])
+        headers.append(('ETag', retag))
+        headers.append(('Content-Length', len(image_data)))
+        return req.make_response(image_data, headers)
     def placeholder(self, req):
         addons_path = openerpweb.addons_manifest['web']['addons_path']
         return open(os.path.join(addons_path, 'web', 'static', 'src', 'img', 'placeholder.png'), 'rb').read()
diff --git a/addons/web_kanban/static/src/js/kanban.js b/addons/web_kanban/static/src/js/kanban.js
index 7e3d8c10e6b..2b123468260 100644
--- a/addons/web_kanban/static/src/js/kanban.js
+++ b/addons/web_kanban/static/src/js/kanban.js
@@ -743,10 +743,6 @@ instance.web_kanban.KanbanRecord = instance.web.OldWidget.extend({
     kanban_image: function(model, field, id) {
         id = id || '';
         var url = instance.connection.prefix + '/web/binary/image?session_id=' + this.session.session_id + '&model=' + model + '&field=' + field + '&id=' + id;
-        if (this.record.__last_update && this.record.__last_update.raw_value) {
-            var time = instance.web.str_to_datetime(this.record.__last_update.raw_value).getTime();
-            url += '&t=' + time;
-        }
         return url;
     },
     kanban_text_ellipsis: function(s, size) {