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Tue, Nov 19, 13:43

client.py
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# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2014, 2015 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.
"""Client blueprint used to handle OAuth callbacks."""
from __future__ import absolute_import
from flask import Blueprint, abort, current_app, request, session, url_for
from flask_login import user_logged_out
from itsdangerous import BadData, TimedJSONWebSignatureSerializer
from werkzeug.local import LocalProxy
from invenio.base.globals import cfg
from invenio.ext.sslify import ssl_required
from invenio.utils.url import get_safe_redirect_target
from ..client import disconnect_handlers, handlers, oauth, signup_handlers
from ..handlers import authorized_default_handler, disconnect_handler, \
make_handler, make_token_getter, oauth_logout_handler, set_session_next_url
blueprint = Blueprint(
'oauthclient',
__name__,
url_prefix="/oauth",
static_folder="../static",
template_folder="../templates",
)
serializer = LocalProxy(
lambda: TimedJSONWebSignatureSerializer(
cfg['SECRET_KEY'],
expires_in=cfg['OAUTHCLIENT_STATE_EXPIRES'],
)
)
@blueprint.before_app_first_request
def setup_app():
"""Setup OAuth clients."""
# Connect signal to remove access tokens on logout
user_logged_out.connect(oauth_logout_handler)
# Add remote applications
oauth.init_app(current_app)
for remote_app, conf in cfg['OAUTHCLIENT_REMOTE_APPS'].items():
# Prevent double creation problems
if remote_app not in oauth.remote_apps:
remote = oauth.remote_app(
remote_app,
**conf['params']
)
remote = oauth.remote_apps[remote_app]
# Set token getter for remote
remote.tokengetter(make_token_getter(remote))
# Register authorized handler
handlers.register(
remote_app,
remote.authorized_handler(make_handler(
conf.get('authorized_handler', authorized_default_handler),
remote,
))
)
# Register disconnect handler
disconnect_handlers.register(
remote_app, make_handler(
conf.get('disconnect_handler', disconnect_handler),
remote,
with_response=False,
)
)
# Register sign-up handlers
def dummy_handler(remote, *args, **kargs):
pass
signup_handler = conf.get('signup_handler', dict())
account_info_handler = make_handler(
signup_handler.get('info', dummy_handler),
remote,
with_response=False
)
account_setup_handler = make_handler(
signup_handler.get('setup', dummy_handler),
remote,
with_response=False
)
account_view_handler = make_handler(
signup_handler.get('view', dummy_handler),
remote,
with_response=False
)
signup_handlers.register(
remote_app,
dict(
info=account_info_handler,
setup=account_setup_handler,
view=account_view_handler,
)
)
@blueprint.route('/login/<remote_app>/')
@ssl_required
def login(remote_app):
"""Send user to remote application for authentication."""
if remote_app not in oauth.remote_apps:
return abort(404)
# Get redirect target in safe manner.
next_param = get_safe_redirect_target(arg='next')
# Redirect URI - must be registered in the remote service.
callback_url = url_for(
'.authorized',
remote_app=remote_app,
_external=True,
)
# Create a JSON Web Token that expires after OAUTHCLIENT_STATE_EXPIRES
# seconds.
state_token = serializer.dumps({
'app': remote_app,
'next': next_param,
'sid': session.sid,
})
return oauth.remote_apps[remote_app].authorize(
callback=callback_url,
state=state_token,
)
@blueprint.route('/authorized/<remote_app>/')
@ssl_required
def authorized(remote_app=None):
"""Authorized handler callback."""
if remote_app not in handlers:
return abort(404)
state_token = request.args.get('state')
# Verify state parameter
try:
assert state_token
# Checks authenticity and integrity of state and decodes the value.
state = serializer.loads(state_token)
# Verify that state is for this session, app and that next parameter
# have not been modified.
assert state['sid'] == session.sid
assert state['app'] == remote_app
# Store next URL
set_session_next_url(remote_app, state['next'])
except (AssertionError, BadData):
if current_app.config.get('OAUTHCLIENT_STATE_ENABLED', True) or (
not(current_app.debug or current_app.testing)):
abort(403)
return handlers[remote_app]()
@blueprint.route('/signup/<remote_app>/', methods=['GET', 'POST'])
@ssl_required
def signup(remote_app):
"""Extra signup step."""
if remote_app not in signup_handlers:
return abort(404)
res = signup_handlers[remote_app]['view']()
return abort(404) if res is None else res
@blueprint.route('/disconnect/<remote_app>/')
@ssl_required
def disconnect(remote_app):
"""Disconnect user from remote application.
Removes application as well as associated information.
"""
if remote_app not in disconnect_handlers:
return abort(404)
return disconnect_handlers[remote_app]()

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