[webrequest] set DBAPISession without cnx at initialisation time
Such session are necessary for minimal use of a Request. Setting on by default
allow simplification later linking with a full featured DBAPISession or
equivalent. This was not possible before as all session was tracked by session
manager. They are not tracked anymore since aa709bc6b6c1 and we can safely
create them by default.
related to #2503918
# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""CubicWeb web client application object"""
__docformat__ = "restructuredtext en"
import sys
from time import clock, time
from contextlib import contextmanager
from warnings import warn
import httplib
from logilab.common.deprecation import deprecated
from rql import BadRQLQuery
from cubicweb import set_log_methods, cwvreg
from cubicweb import (
ValidationError, Unauthorized, Forbidden,
AuthenticationError, NoSelectableObject,
BadConnectionId, CW_EVENT_MANAGER)
from cubicweb.dbapi import DBAPISession, anonymous_session
from cubicweb.web import LOGGER, component
from cubicweb.web import (
StatusResponse, DirectResponse, Redirect, NotFound, LogOut,
RemoteCallFailed, InvalidSession, RequestError)
from cubicweb.web.request import CubicWebRequestBase
# make session manager available through a global variable so the debug view can
# print information about web session
SESSION_MANAGER = None
@contextmanager
def anonymized_request(req):
orig_session = req.session
req.set_session(anonymous_session(req.vreg))
try:
yield req
finally:
req.set_session(orig_session)
class AbstractSessionManager(component.Component):
"""manage session data associated to a session identifier"""
__regid__ = 'sessionmanager'
def __init__(self, repo):
vreg = repo.vreg
self.session_time = vreg.config['http-session-time'] or None
self.authmanager = vreg['components'].select('authmanager', repo=repo)
interval = (self.session_time or 0) / 2.
if vreg.config.anonymous_user() is not None:
self.cleanup_anon_session_time = vreg.config['cleanup-anonymous-session-time'] or 5 * 60
assert self.cleanup_anon_session_time > 0
if self.session_time is not None:
self.cleanup_anon_session_time = min(self.session_time,
self.cleanup_anon_session_time)
interval = self.cleanup_anon_session_time / 2.
# we don't want to check session more than once every 5 minutes
self.clean_sessions_interval = max(5 * 60, interval)
def clean_sessions(self):
"""cleanup sessions which has not been unused since a given amount of
time. Return the number of sessions which have been closed.
"""
self.debug('cleaning http sessions')
session_time = self.session_time
closed, total = 0, 0
for session in self.current_sessions():
total += 1
try:
last_usage_time = session.cnx.check()
except AttributeError:
last_usage_time = session.mtime
except BadConnectionId:
self.close_session(session)
closed += 1
else:
no_use_time = (time() - last_usage_time)
if session.anonymous_session:
if no_use_time >= self.cleanup_anon_session_time:
self.close_session(session)
closed += 1
elif session_time is not None and no_use_time >= session_time:
self.close_session(session)
closed += 1
return closed, total - closed
def current_sessions(self):
"""return currently open sessions"""
raise NotImplementedError()
def get_session(self, req, sessionid):
"""return existing session for the given session identifier"""
raise NotImplementedError()
def open_session(self, req):
"""open and return a new session for the given request.
raise :exc:`cubicweb.AuthenticationError` if authentication failed
(no authentication info found or wrong user/password)
"""
raise NotImplementedError()
def close_session(self, session):
"""close session on logout or on invalid session detected (expired out,
corrupted...)
"""
raise NotImplementedError()
class AbstractAuthenticationManager(component.Component):
"""authenticate user associated to a request and check session validity"""
__regid__ = 'authmanager'
def __init__(self, repo):
self.vreg = repo.vreg
def validate_session(self, req, session):
"""check session validity, reconnecting it to the repository if the
associated connection expired in the repository side (hence the
necessity for this method).
raise :exc:`InvalidSession` if session is corrupted for a reason or
another and should be closed
"""
raise NotImplementedError()
def authenticate(self, req):
"""authenticate user using connection information found in the request,
and return corresponding a :class:`~cubicweb.dbapi.Connection` instance,
as well as login and authentication information dictionary used to open
the connection.
raise :exc:`cubicweb.AuthenticationError` if authentication failed
(no authentication info found or wrong user/password)
"""
raise NotImplementedError()
class CookieSessionHandler(object):
"""a session handler using a cookie to store the session identifier"""
def __init__(self, appli):
self.repo = appli.repo
self.vreg = appli.vreg
self.session_manager = self.vreg['components'].select('sessionmanager',
repo=self.repo)
global SESSION_MANAGER
SESSION_MANAGER = self.session_manager
if self.vreg.config.mode != 'test':
# don't try to reset session manager during test, this leads to
# weird failures when running multiple tests
CW_EVENT_MANAGER.bind('after-registry-reload',
self.reset_session_manager)
def reset_session_manager(self):
data = self.session_manager.dump_data()
self.session_manager = self.vreg['components'].select('sessionmanager',
repo=self.repo)
self.session_manager.restore_data(data)
global SESSION_MANAGER
SESSION_MANAGER = self.session_manager
@property
def clean_sessions_interval(self):
return self.session_manager.clean_sessions_interval
def clean_sessions(self):
"""cleanup sessions which has not been unused since a given amount of
time
"""
self.session_manager.clean_sessions()
def session_cookie(self, req):
"""return a string giving the name of the cookie used to store the
session identifier.
"""
if req.https:
return '__%s_https_session' % self.vreg.config.appid
return '__%s_session' % self.vreg.config.appid
def get_session(self, req):
"""Return a session object corresponding to credentials held by the req
Session id is searched from :
- # form variable
- cookie
If no session id is found, try opening a new session with credentials
found in the request.
Raises AuthenticationError if no session can be found or created.
"""
cookie = req.get_cookie()
sessioncookie = self.session_cookie(req)
try:
sessionid = str(cookie[sessioncookie].value)
session = self.get_session_by_id(req, sessionid)
except (KeyError, InvalidSession): # no valid session cookie
session = self.open_session(req)
return session
def get_session_by_id(self, req, sessionid):
session = self.session_manager.get_session(req, sessionid)
session.mtime = time()
return session
def open_session(self, req):
session = self.session_manager.open_session(req)
sessioncookie = self.session_cookie(req)
secure = req.https and req.base_url().startswith('https://')
req.set_cookie(sessioncookie, session.sessionid,
maxage=None, secure=secure)
if not session.anonymous_session:
self.session_manager.postlogin(req, session)
return session
def logout(self, req, goto_url):
"""logout from the instance by cleaning the session and raising
`AuthenticationError`
"""
self.session_manager.close_session(req.session)
req.remove_cookie(self.session_cookie(req))
raise LogOut(url=goto_url)
# these are overridden by set_log_methods below
# only defining here to prevent pylint from complaining
info = warning = error = critical = exception = debug = lambda msg,*a,**kw: None
class CubicWebPublisher(object):
"""the publisher is a singleton hold by the web frontend, and is responsible
to publish HTTP request.
The http server will call its main entry point ``application.handle_request``.
.. automethod:: cubicweb.web.application.CubicWebPublisher.main_handle_request
You have to provide both a repository and web-server config at
initialization. In all in one instance both config will be the same.
"""
def __init__(self, repo, config, session_handler_fact=CookieSessionHandler):
self.info('starting web instance from %s', config.apphome)
self.repo = repo
self.vreg = repo.vreg
# get instance's schema
if not self.vreg.initialized:
config.init_cubes(self.repo.get_cubes())
self.vreg.init_properties(self.repo.properties())
self.vreg.set_schema(self.repo.get_schema())
# set the correct publish method
if config['query-log-file']:
from threading import Lock
self._query_log = open(config['query-log-file'], 'a')
self.handle_request = self.log_handle_request
self._logfile_lock = Lock()
else:
self._query_log = None
self.handle_request = self.main_handle_request
# instantiate session and url resolving helpers
self.session_handler = session_handler_fact(self)
self.set_urlresolver()
CW_EVENT_MANAGER.bind('after-registry-reload', self.set_urlresolver)
def set_urlresolver(self):
self.url_resolver = self.vreg['components'].select('urlpublisher',
vreg=self.vreg)
def get_session(self, req):
"""Return a session object corresponding to credentials held by the req
May raise AuthenticationError.
"""
return self.session_handler.get_session(req)
# publish methods #########################################################
def log_handle_request(self, req, path):
"""wrapper around _publish to log all queries executed for a given
accessed path
"""
try:
return self.main_handle_request(req, path)
finally:
cnx = req.cnx
if cnx:
with self._logfile_lock:
try:
result = ['\n'+'*'*80]
result.append(req.url())
result += ['%s %s -- (%.3f sec, %.3f CPU sec)' % q
for q in cnx.executed_queries]
cnx.executed_queries = []
self._query_log.write('\n'.join(result).encode(req.encoding))
self._query_log.flush()
except Exception:
self.exception('error while logging queries')
def main_handle_request(self, req, path):
"""Process and http request
Arguments are:
- a Request object
- path of the request object
It return the content of the http response. HTTP header and status are
are set on the Request Object.
"""
if not isinstance(req, CubicWebRequestBase):
warn('[3.15] Application entry poin arguments are now (req, path) '
'not (path, req)', DeprecationWarning, 2)
req, path = path, req
if req.authmode == 'http':
# activate realm-based auth
realm = self.vreg.config['realm']
req.set_header('WWW-Authenticate', [('Basic', {'realm' : realm })], raw=False)
content = ''
try:
try:
session = self.get_session(req)
req.set_session(session)
except AuthenticationError:
# Keep the dummy session set at initialisation.
# such session with work to an some extend but raise an
# AuthenticationError on any database access.
pass
# XXX We want to clean up this approach in the future. But
# several cubes like registration or forgotten password rely on
# this principle.
assert req.session is not None
# DENY https acces for anonymous_user
if (req.https
and req.session.anonymous_session
and self.vreg.config['https-deny-anonymous']):
# don't allow anonymous on https connection
raise AuthenticationError()
# nested try to allow LogOut to delegate logic to AuthenticationError
# handler
try:
### Try to generate the actual request content
content = self.core_handle(req, path)
# Handle user log-out
except LogOut as ex:
# When authentification is handled by cookie the code that
# raised LogOut must has invalidated the cookie. We can just
# reload the original url without authentification
if self.vreg.config['auth-mode'] == 'cookie' and ex.url:
req.headers_out.setHeader('location', str(ex.url))
if ex.status is not None:
req.status_out = httplib.SEE_OTHER
# When the authentification is handled by http we must
# explicitly ask for authentification to flush current http
# authentification information
else:
# Render "logged out" content.
# assignement to ``content`` prevent standard
# AuthenticationError code to overwrite it.
content = self.loggedout_content(req)
# let the explicitly reset http credential
raise AuthenticationError()
except Redirect as ex:
# authentication needs redirection (eg openid)
content = self.redirect_handler(req, ex)
# Wrong, absent or Reseted credential
except AuthenticationError:
# If there is an https url configured and
# the request do not used https, redirect to login form
https_url = self.vreg.config['https-url']
if https_url and req.base_url() != https_url:
req.status_out = httplib.SEE_OTHER
req.headers_out.setHeader('location', https_url + 'login')
else:
# We assume here that in http auth mode the user *May* provide
# Authentification Credential if asked kindly.
if self.vreg.config['auth-mode'] == 'http':
req.status_out = httplib.UNAUTHORIZED
# In the other case (coky auth) we assume that there is no way
# for the user to provide them...
# XXX But WHY ?
else:
req.status_out = httplib.FORBIDDEN
# If previous error handling already generated a custom content
# do not overwrite it. This is used by LogOut Except
# XXX ensure we don't actually serve content
if not content:
content = self.need_login_content(req)
return content
def core_handle(self, req, path):
"""method called by the main publisher to process <path>
should return a string containing the resulting page or raise a
`NotFound` exception
:type path: str
:param path: the path part of the url to publish
:type req: `web.Request`
:param req: the request object
:rtype: str
:return: the result of the pusblished url
"""
# don't log form values they may contains sensitive information
self.debug('publish "%s" (%s, form params: %s)',
path, req.session.sessionid, list(req.form))
# remove user callbacks on a new request (except for json controllers
# to avoid callbacks being unregistered before they could be called)
tstart = clock()
commited = False
try:
### standard processing of the request
try:
ctrlid, rset = self.url_resolver.process(req, path)
try:
controller = self.vreg['controllers'].select(ctrlid, req,
appli=self)
except NoSelectableObject:
raise Unauthorized(req._('not authorized'))
req.update_search_state()
result = controller.publish(rset=rset)
except StatusResponse as ex:
warn('StatusResponse is deprecated use req.status_out',
DeprecationWarning)
result = ex.content
req.status_out = ex.status
except Redirect as ex:
# Redirect may be raised by edit controller when everything went
# fine, so attempt to commit
result = self.redirect_handler(req, ex)
if req.cnx:
txuuid = req.cnx.commit()
commited = True
if txuuid is not None:
req.data['last_undoable_transaction'] = txuuid
### error case
except NotFound as ex:
result = self.notfound_content(req)
req.status_out = ex.status
except ValidationError as ex:
result = self.validation_error_handler(req, ex)
except RemoteCallFailed as ex:
result = self.ajax_error_handler(req, ex)
except Unauthorized as ex:
req.data['errmsg'] = req._('You\'re not authorized to access this page. '
'If you think you should, please contact the site administrator.')
req.status_out = httplib.UNAUTHORIZED
result = self.error_handler(req, ex, tb=False)
except Forbidden as ex:
req.data['errmsg'] = req._('This action is forbidden. '
'If you think it should be allowed, please contact the site administrator.')
req.status_out = httplib.FORBIDDEN
result = self.error_handler(req, ex, tb=False)
except (BadRQLQuery, RequestError) as ex:
result = self.error_handler(req, ex, tb=False)
### pass through exception
except DirectResponse:
if req.cnx:
req.cnx.commit()
raise
except (AuthenticationError, LogOut):
# the rollback is handled in the finally
raise
### Last defense line
except BaseException as ex:
req.status_out = httplib.INTERNAL_SERVER_ERROR
result = self.error_handler(req, ex, tb=True)
finally:
if req.cnx and not commited:
try:
req.cnx.rollback()
except Exception:
pass # ignore rollback error at this point
# request may be referenced by "onetime callback", so clear its entity
# cache to avoid memory usage
req.drop_entity_cache()
self.add_undo_link_to_msg(req)
self.debug('query %s executed in %s sec', req.relative_path(), clock() - tstart)
return result
# Error handlers
def redirect_handler(self, req, ex):
"""handle redirect
- comply to ex status
- set header field
- return empty content
"""
self.debug('redirecting to %s', str(ex.location))
req.headers_out.setHeader('location', str(ex.location))
assert 300 <= ex.status < 400
req.status_out = ex.status
return ''
def validation_error_handler(self, req, ex):
ex.translate(req._) # translate messages using ui language
if '__errorurl' in req.form:
forminfo = {'error': ex,
'values': req.form,
'eidmap': req.data.get('eidmap', {})
}
req.session.data[req.form['__errorurl']] = forminfo
# XXX form session key / __error_url should be differentiated:
# session key is 'url + #<form dom id', though we usually don't want
# the browser to move to the form since it hides the global
# messages.
location = req.form['__errorurl'].rsplit('#', 1)[0]
req.headers_out.setHeader('location', str(location))
req.status_out = httplib.SEE_OTHER
return ''
req.status_out = httplib.CONFLICT
return self.error_handler(req, ex, tb=False)
def error_handler(self, req, ex, tb=False):
excinfo = sys.exc_info()
if tb:
self.exception(repr(ex))
req.set_header('Cache-Control', 'no-cache')
req.remove_header('Etag')
req.remove_header('Content-disposition')
req.reset_message()
req.reset_headers()
if req.ajax_request:
return self.ajax_error_handler(req, ex)
try:
req.data['ex'] = ex
if tb:
req.data['excinfo'] = excinfo
req.form['vid'] = 'error'
errview = self.vreg['views'].select('error', req)
template = self.main_template_id(req)
content = self.vreg['views'].main_template(req, template, view=errview)
except Exception:
content = self.vreg['views'].main_template(req, 'error-template')
if getattr(ex, 'status', None) is not None:
req.status_out = ex.status
return content
def add_undo_link_to_msg(self, req):
txuuid = req.data.get('last_undoable_transaction')
if txuuid is not None:
msg = u'<span class="undo">[<a href="%s">%s</a>]</span>' %(
req.build_url('undo', txuuid=txuuid), req._('undo'))
req.append_to_redirect_message(msg)
def ajax_error_handler(self, req, ex):
req.set_header('content-type', 'application/json')
status = ex.status
if status is None:
status = httplib.INTERNAL_SERVER_ERROR
json_dumper = getattr(ex, 'dumps', lambda : unicode(ex))
req.status_out = status
return json_dumper()
# special case handling
def need_login_content(self, req):
return self.vreg['views'].main_template(req, 'login')
def loggedout_content(self, req):
return self.vreg['views'].main_template(req, 'loggedout')
def notfound_content(self, req):
req.form['vid'] = '404'
view = self.vreg['views'].select('404', req)
template = self.main_template_id(req)
return self.vreg['views'].main_template(req, template, view=view)
# template stuff
def main_template_id(self, req):
template = req.form.get('__template', req.property_value('ui.main-template'))
if template not in self.vreg['views']:
template = 'main-template'
return template
# these are overridden by set_log_methods below
# only defining here to prevent pylint from complaining
info = warning = error = critical = exception = debug = lambda msg,*a,**kw: None
set_log_methods(CubicWebPublisher, LOGGER)
set_log_methods(CookieSessionHandler, LOGGER)