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wrappers.py
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# -*- coding: utf-8 -*-
# This file is part of Invenio.
# Copyright (C) 2011, 2012, 2013, 2014 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.
"""
Implements the Flask application wrapper.
The function :func:`~flask.url_for` in standard :class:`~flask.Flask`
application changes only protocol for secure sites from 'http' to 'https'.
However, in case the application uses non standard ports (e.g.
http://example.org:4000, https://example:4001) or even different urls (e.g.
http://www.example.org, https://secure.example.org) following
:class:`Flask` wrapper is necessary.
Configuration:
+-----------------------+-----------------------------------------------------+
| `CFG_SITE_URL` | specify URL under which your installation will be |
| | visible. For example, use "http://your.site.com". |
| | Do not leave the trailing slash. |
+-----------------------+-----------------------------------------------------+
| `CFG_SITE_SECURE_URL` | specify secure URL under which your installation's |
| | secure pages such as login or registration will be |
| | visible. For example, use "https://your.site.com". |
| | Do not leave the trailing slash. If you don't plan |
| | using HTTPS, then you may leave this empty. |
+-----------------------+-----------------------------------------------------+
The following example shows how to make http and https url scheme look the
same.
.. doctest::
>>> from flask import url_for
>>> from invenio.base.factory import create_app
>>> app = create_app()
>>> app.config['CFG_SITE_URL'] = 'http://localhost:4000'
>>> app.config['CFG_SITE_SECURE_URL'] = 'http://localhost:4000'
>>> ctx = app.test_request_context()
>>> ctx.push()
>>> url_for('search.search')
'/search'
>>> url_for('search.search', _external=True)
'http://localhost:4000/search'
>>> url_for('search.search', _external=True, _scheme='https')
'http://localhost:4000/search'
"""
from functools import wraps
from flask import Flask as FlaskBase, current_app
from werkzeug.utils import import_string
from werkzeug.local import LocalProxy
from .signals import before_handle_user_exception
def _decorate_url_adapter_build(wrapped):
"""Change behavior of :func:`flask.url_for` for http and https scheme."""
@wraps(wrapped)
def decorator(*args, **kwargs):
"""Overwrite blueprint static url.
:note: Custom blueprint 'static' endpoint will **NOT** work!
"""
args = list(args)
if args[0].endswith('.static'):
args[0] = 'static'
url_scheme_prefixes = {
'http': current_app.config['CFG_SITE_URL'],
'https': current_app.config['CFG_SITE_SECURE_URL']
}
force_external = kwargs.get('force_external', True)
url_scheme = getattr(wrapped.im_self, 'url_scheme', 'http')
kwargs['force_external'] = False
url = wrapped(*args, **kwargs)
if force_external:
url = url_scheme_prefixes.get(url_scheme) + url
return url
return decorator
class Flask(FlaskBase): # pylint: disable=R0904
"""
Overriding the default Flask class.
For more information about :class:`Flask` class see the official
documentation of :class:`flask.Flask`.
"""
def create_url_adapter(self, request):
"""Create the URL adapter.
Change behavior of default `create_url_adapter` method to allow
advance url generation.
"""
url_adapter = super(self.__class__, self).create_url_adapter(request)
if url_adapter is not None and hasattr(url_adapter, 'build'):
url_adapter.build = _decorate_url_adapter_build(url_adapter.build)
return url_adapter
def handle_user_exception(self, e):
"""Handle the user exception.
Hook a before handle to it.
"""
before_handle_user_exception.send(e)
return super(Flask, self).handle_user_exception(e)
def lazy_import(name):
"""Lazy import of the given `name`.
:see: :func:`werkzeug.utils.import_string` and
:class:`werkzeug.local.LocalProxy`
:param name: importable string
:return: proxy to result of :func:`~werkzeug.utils.import_string`
"""
return LocalProxy(lambda: import_string(name))

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