[FIX] dbfilter_from_header: prevent autoloading

dbfilter_from_header/README.rst

@@ -18,7 +18,14 @@ In nginx, use one of:
 * proxy_set_header X-OpenERP-dbfilter [your filter];
 * proxy_set_header X-Odoo-dbfilter [your filter];
 
-This addon has to be loaded as server-wide module.
+Make sure that proxy mode is enabled in Odoo's configuration file:
+
+`proxy_mode = True`
+
+And load module as a server-wide module, either via the ``--load`` command-line parameter
+or by the ``server_wide_modules`` parameter:
+
+``server_wide_modules = "web, web_kanban, dbfilter_from_header"``
 
 Bug Tracker
 ===========

dbfilter_from_header/__init__.py

@@ -3,8 +3,10 @@
 # © 2014  ACSONE SA/NV
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
+import logging
 import re
 from openerp import http
+from openerp.tools import config
 
 db_filter_org = http.db_filter
 
@@ -22,4 +24,8 @@ def db_filter(dbs, httprequest=None):
         dbs = [db for db in dbs if re.match(db_filter_hdr, db)]
     return dbs
 
-http.db_filter = db_filter
+if config.get('proxy_mode') and \
+   'dbfilter_from_header' in config.get('server_wide_modules'):
+    _logger = logging.getLogger(__name__)
+    _logger.info('monkey patching http.db_filter')
+    http.db_filter = db_filter