[IMP] crm: Use cookies to save utm instead of session.

addons/crm/crm.py

@@ -82,7 +82,7 @@ class crm_tracking_mixin(osv.AbstractModel):
     def tracking_get_values(self, cr, uid, vals, context=None):
         for key, field in self.tracking_fields():
             column = self._all_columns[field].column
-            value = vals.get(field) or (request and request.session.get(key))  # params.get should be always in session by the dispatch from ir_http
+            value = vals.get(field) or (request and request.httprequest.cookies.get(key))  # params.get should be always in session by the dispatch from ir_http
             if column._type in ['many2one'] and isinstance(value, basestring):  # if we receive a string for a many2one, we search / create the id
                 if value:
                     Model = self.pool[column._obj]

addons/crm/ir_http.py

@@ -6,8 +6,12 @@ from openerp.osv import orm
 class ir_http(orm.AbstractModel):
     _inherit = 'ir.http'
 
+    def get_utm_domain_cookies(slef):
+        return request.httprequest.host
+
     def _dispatch(self):
+        response = super(ir_http, self)._dispatch()
         for var, dummy in self.pool['crm.tracking.mixin'].tracking_fields():
             if var in request.params and (var not in request.session or request.session[var] != request.params[var]):
-                    request.session[var] = request.params[var]
-        return super(ir_http, self)._dispatch()
+                response.set_cookie(var, request.params[var], domain=self.get_utm_domain_cookies())
+        return response