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R3600/invenio/base/before_request_functions.py
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before_request_functions.py
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# -*- coding: utf-8 -*-
## This file is part of Invenio.
## Copyright (C) 2012, 2013 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""
invenio.base.before_request_functions
-------------------------------------
Implements functions to configure necessary the "before request" functions
one wants to attach to the application at the global level.
"""
from flask import request, session, g, current_app
from flask.ext.login import current_user
def guess_language():
"""
Computes the language needed to return the answer to the client.
This information will then be available in the session['ln'] and in g.ln.
Additionally under g._ an already configured internationalization function
will be available (configured to return unicode objects).
"""
#FIXME
from invenio.base.i18n import wash_language, gettext_set_language
required_ln = None
passed_ln = request.values.get('ln', type=str)
if passed_ln:
## If ln is specified explictly as a GET or POST argument
## let's take it!
required_ln = wash_language(passed_ln)
if passed_ln != required_ln:
## But only if it was a valid language
required_ln = None
if required_ln:
## Ok it was. We store it in the session.
session["ln"] = required_ln
if not "ln" in session:
## If there is no language saved into the session...
user_language = current_user.get("language")
if user_language:
## ... and the user is logged in, we try to take it from its
## settings.
session["ln"] = user_language
else:
## Otherwise we try to guess it from its request headers
for value, quality in request.accept_languages:
value = str(value)
ln = wash_language(value)
if ln == value or ln[:2] == value[:2]:
session["ln"] = ln
break
else:
## Too bad! We stick to the default :-)
session["ln"] = current_app.config.get('CFG_SITE_LANG')
## Well, let's make it global now
g.ln = session["ln"]
g._ = gettext_set_language(g.ln, use_unicode=True)
def setup_app(app):
"""Attaches functions to before request handler."""
app.before_request(guess_language)
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