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helpers.py
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Sun, Sep 29, 20:55

helpers.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.helpers
--------------------
Implements various helpers.
"""
from functools import wraps
from flask import Flask, current_app, has_app_context
from six import iteritems, text_type, string_types
def with_app_context(app=None, new_context=False, **kwargs_config):
"""Run function within application context"""
def get_application():
"""Returns an application instance."""
if app is not None and not isinstance(app, Flask) and callable(app):
return app(**kwargs_config)
else:
from .factory import create_app
return create_app(**kwargs_config)
def decorator(f):
@wraps(f)
def decorated_func(*args, **kwargs):
"""This function has to run within application context."""
if not has_app_context() or new_context:
with get_application().test_request_context('/'):
#FIXME we should use maybe app_context()
current_app.preprocess_request()
result = f(*args, **kwargs)
else:
result = f(*args, **kwargs)
return result
return decorated_func
return decorator
def unicodifier(obj):
"""
Tries to (recursively) convert the given object into unicode, assuming
a UTF-8 encoding)
:param obj: the object to convert
(can be e.g. unicode, str, list, tuple, dict)
"""
if isinstance(obj, text_type):
return obj
elif isinstance(obj, string_types):
return obj.decode('utf8')
elif isinstance(obj, list):
return [unicodifier(elem) for elem in obj]
elif isinstance(obj, tuple):
return tuple(unicodifier(elem) for elem in obj)
elif isinstance(obj, dict):
return dict((key, unicodifier(value)) for key, value in iteritems(obj))
return obj
def utf8ifier(obj):
"""
Tries to (recursively) convert the given object into utf8.
:param obj: the object to convert
(can be e.g. unicode, str, list, tuple, dict)
"""
if isinstance(obj, text_type):
return obj.encode('utf8')
elif isinstance(obj, string_types):
return obj
elif isinstance(obj, list):
return [utf8ifier(elem) for elem in obj]
elif isinstance(obj, tuple):
return tuple(utf8ifier(elem) for elem in obj)
elif isinstance(obj, dict):
return dict((key, utf8ifier(value)) for key, value in iteritems(obj))
return obj

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