Source code for invenio_pages.ext
# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2015, 2016 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.
#
# In applying this license, CERN does not
# waive the privileges and immunities granted to it by virtue of its status
# as an Intergovernmental Organization or submit itself to any jurisdiction.
"""Static pages module for Invenio."""
from __future__ import absolute_import, print_function
from distutils.version import StrictVersion
from flask import __version__ as flask_version
from flask import url_for
from jinja2.sandbox import SandboxedEnvironment
from werkzeug.exceptions import NotFound
from . import config
from .views import handle_not_found
class _InvenioPagesState(object):
"""State object for Invenio Pages."""
def __init__(self, app):
"""Initialize state.
:param app: The Flask application.
"""
self.app = app
self._jinja_env = None
@property
def jinja_env(self):
"""Create a sandboxed Jinja environment."""
if self._jinja_env is None:
self._jinja_env = SandboxedEnvironment(
extensions=[
'jinja2.ext.autoescape', 'jinja2.ext.with_', ],
autoescape=True,
)
self._jinja_env.globals['url_for'] = url_for
# Load whitelisted configuration variables.
for var in self.app.config['PAGES_WHITELIST_CONFIG_KEYS']:
self._jinja_env.globals[var] = self.app.config.get(var)
return self._jinja_env
def render_template(self, source, **kwargs_context):
r"""Render a template string using sandboxed environment.
:param source: A string containing the page source.
:param \*\*kwargs_context: The context associated with the page.
:returns: The rendered template.
"""
return self.jinja_env.from_string(source).render(kwargs_context)
[docs]class InvenioPages(object):
"""Invenio-Pages extension."""
def __init__(self, app=None):
"""Extension initialization.
:param app: The Flask application. (Default: ``None``)
"""
if app:
self.init_app(app)
@staticmethod
[docs] def wrap_errorhandler(app):
"""Wrap error handler.
:param app: The Flask application.
"""
try:
existing_handler = app.error_handler_spec[None][404][NotFound]
except (KeyError, TypeError):
existing_handler = None
if existing_handler:
app.error_handler_spec[None][404][NotFound] = \
lambda error: handle_not_found(error, wrapped=existing_handler)
else:
app.error_handler_spec.setdefault(None, {}).setdefault(404, {})
app.error_handler_spec[None][404][NotFound] = handle_not_found
[docs] def init_app(self, app):
"""Flask application initialization.
:param app: The Flask application.
:returns: The :class:`invenio_pages.ext.InvenioPages` instance
initialized.
"""
self.init_config(app)
self.wrap_errorhandler(app)
app.extensions['invenio-pages'] = _InvenioPagesState(app)
return app.extensions['invenio-pages']
[docs] def init_config(self, app):
"""Initialize configuration.
:param app: The Flask application.
"""
app.config.setdefault(
"PAGES_BASE_TEMPLATE",
app.config.get("BASE_TEMPLATE",
"invenio_pages/base.html"))
for k in dir(config):
if k.startswith('PAGES_'):
app.config.setdefault(k, getattr(config, k))