# copyright 2003-2013 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/>.
#
# (disable pylint msg for client obj access to protected member as in obj._cw)
# pylint: disable=W0212
"""The ``ajaxcontroller`` module defines the :class:`AjaxController`
controller and the ``ajax-func`` cubicweb registry.
.. autoclass:: cubicweb.web.views.ajaxcontroller.AjaxController
:members:
``ajax-funcs`` registry hosts exposed remote functions, that is
functions that can be called from the javascript world.
To register a new remote function, either decorate your function
with the :func:`~cubicweb.web.views.ajaxcontroller.ajaxfunc` decorator:
.. sourcecode:: python
from cubicweb.predicates import mactch_user_groups
from cubicweb.web.views.ajaxcontroller import ajaxfunc
@ajaxfunc(output_type='json', selector=match_user_groups('managers'))
def list_users(self):
return [u for (u,) in self._cw.execute('Any L WHERE U login L')]
or inherit from :class:`~cubicweb.web.views.ajaxcontroller.AjaxFunction` and
implement the ``__call__`` method:
.. sourcecode:: python
from cubicweb.web.views.ajaxcontroller import AjaxFunction
class ListUser(AjaxFunction):
__regid__ = 'list_users' # __regid__ is the name of the exposed function
__select__ = match_user_groups('managers')
output_type = 'json'
def __call__(self):
return [u for (u, ) in self._cw.execute('Any L WHERE U login L')]
.. autoclass:: cubicweb.web.views.ajaxcontroller.AjaxFunction
:members:
.. autofunction:: cubicweb.web.views.ajaxcontroller.ajaxfunc
"""
__docformat__ = "restructuredtext en"
from warnings import warn
from functools import partial
from six import PY2, text_type
from logilab.common.date import strptime
from logilab.common.registry import yes
from logilab.common.deprecation import deprecated
from cubicweb import ObjectNotFound, NoSelectableObject
from cubicweb.appobject import AppObject
from cubicweb.utils import json, json_dumps, UStringIO
from cubicweb.uilib import exc_message
from cubicweb.web import RemoteCallFailed, DirectResponse
from cubicweb.web.controller import Controller
from cubicweb.web.views import vid_from_rset
from cubicweb.web.views import basecontrollers
def optional_kwargs(extraargs):
if extraargs is None:
return {}
# we receive unicode keys which is not supported by the **syntax
return dict((str(key), value) for key, value in extraargs.items())
[docs]class AjaxController(Controller):
"""AjaxController handles ajax remote calls from javascript
The following javascript function call:
.. sourcecode:: javascript
var d = asyncRemoteExec('foo', 12, "hello");
d.addCallback(function(result) {
alert('server response is: ' + result);
});
will generate an ajax HTTP GET on the following url::
BASE_URL/ajax?fname=foo&arg=12&arg="hello"
The AjaxController controller will therefore be selected to handle those URLs
and will itself select the :class:`cubicweb.web.views.ajaxcontroller.AjaxFunction`
matching the *fname* parameter.
"""
__regid__ = 'ajax'
def publish(self, rset=None):
self._cw.ajax_request = True
try:
fname = self._cw.form['fname']
except KeyError:
raise RemoteCallFailed('no method specified')
# 1/ check first for old-style (JSonController) ajax func for bw compat
try:
func = getattr(basecontrollers.JSonController, 'js_%s' % fname)
if PY2:
func = func.__func__
func = partial(func, self)
except AttributeError:
# 2/ check for new-style (AjaxController) ajax func
try:
func = self._cw.vreg['ajax-func'].select(fname, self._cw)
except ObjectNotFound:
raise RemoteCallFailed('no %s method' % fname)
else:
warn('[3.15] remote function %s found on JSonController, '
'use AjaxFunction / @ajaxfunc instead' % fname,
DeprecationWarning, stacklevel=2)
# no <arg> attribute means the callback takes no argument
args = self._cw.form.get('arg', ())
if not isinstance(args, (list, tuple)):
args = (args,)
try:
args = [json.loads(arg) for arg in args]
except ValueError as exc:
self.exception('error while decoding json arguments for '
'js_%s: %s (err: %s)', fname, args, exc)
raise RemoteCallFailed(exc_message(exc, self._cw.encoding))
try:
result = func(*args)
except (RemoteCallFailed, DirectResponse):
raise
except Exception as exc:
self.exception('an exception occurred while calling js_%s(%s): %s',
fname, args, exc)
raise RemoteCallFailed(exc_message(exc, self._cw.encoding))
if result is None:
return ''
# get unicode on @htmlize methods, encoded string on @jsonize methods
elif isinstance(result, text_type):
return result.encode(self._cw.encoding)
return result
[docs]class AjaxFunction(AppObject):
"""
Attributes on this base class are:
:attr: `check_pageid`: make sure the pageid received is valid before proceeding
:attr: `output_type`:
- *None*: no processing, no change on content-type
- *json*: serialize with `json_dumps` and set *application/json*
content-type
- *xhtml*: wrap result in an XML node and forces HTML / XHTML
content-type (use ``_cw.html_content_type()``)
"""
__registry__ = 'ajax-func'
__select__ = yes()
__abstract__ = True
check_pageid = False
output_type = None
@staticmethod
def _rebuild_posted_form(names, values, action=None):
form = {}
for name, value in zip(names, values):
# remove possible __action_xxx inputs
if name.startswith('__action'):
if action is None:
# strip '__action_' to get the actual action name
action = name[9:]
continue
# form.setdefault(name, []).append(value)
if name in form:
curvalue = form[name]
if isinstance(curvalue, list):
curvalue.append(value)
else:
form[name] = [curvalue, value]
else:
form[name] = value
# simulate click on __action_%s button to help the controller
if action:
form['__action_%s' % action] = u'whatever'
return form
def validate_form(self, action, names, values):
self._cw.form = self._rebuild_posted_form(names, values, action)
return basecontrollers._validate_form(self._cw, self._cw.vreg)
def _exec(self, rql, args=None, rocheck=True):
"""json mode: execute RQL and return resultset as json"""
rql = rql.strip()
if rql.startswith('rql:'):
rql = rql[4:]
if rocheck:
self._cw.ensure_ro_rql(rql)
try:
return self._cw.execute(rql, args)
except Exception as ex:
self.exception("error in _exec(rql=%s): %s", rql, ex)
return None
return None
def _call_view(self, view, paginate=False, **kwargs):
divid = self._cw.form.get('divid')
# we need to call pagination before with the stream set
try:
stream = view.set_stream()
except AttributeError:
stream = UStringIO()
kwargs['w'] = stream.write
assert not paginate
if divid == 'pageContent':
# ensure divid isn't reused by the view (e.g. table view)
del self._cw.form['divid']
# mimick main template behaviour
stream.write(u'<div id="pageContent">')
vtitle = self._cw.form.get('vtitle')
if vtitle:
stream.write(u'<h1 class="vtitle">%s</h1>\n' % vtitle)
paginate = True
nav_html = UStringIO()
if paginate and not view.handle_pagination:
view.paginate(w=nav_html.write)
stream.write(nav_html.getvalue())
if divid == 'pageContent':
stream.write(u'<div id="contentmain">')
view.render(**kwargs)
extresources = self._cw.html_headers.getvalue(skiphead=True)
if extresources:
stream.write(u'<div class="ajaxHtmlHead">\n') # XXX use a widget?
stream.write(extresources)
stream.write(u'</div>\n')
if divid == 'pageContent':
stream.write(u'</div>%s</div>' % nav_html.getvalue())
return stream.getvalue()
def _ajaxfunc_factory(implementation, selector=yes(), _output_type=None,
_check_pageid=False, regid=None):
"""converts a standard python function into an AjaxFunction appobject"""
class AnAjaxFunc(AjaxFunction):
__regid__ = regid or implementation.__name__
__select__ = selector
output_type = _output_type
check_pageid = _check_pageid
def serialize(self, content):
if self.output_type is None:
return content
elif self.output_type == 'xhtml':
self._cw.set_content_type(self._cw.html_content_type())
return ''.join((u'<div>',
content.strip(), u'</div>'))
elif self.output_type == 'json':
self._cw.set_content_type('application/json')
return json_dumps(content)
raise RemoteCallFailed('no serializer found for output type %s'
% self.output_type)
def __call__(self, *args, **kwargs):
if self.check_pageid:
data = self._cw.session.data.get(self._cw.pageid)
if data is None:
raise RemoteCallFailed(self._cw._('pageid-not-found'))
return self.serialize(implementation(self, *args, **kwargs))
AnAjaxFunc.__name__ = implementation.__name__
# make sure __module__ refers to the original module otherwise
# vreg.register(obj) will ignore ``obj``.
AnAjaxFunc.__module__ = implementation.__module__
# relate the ``implementation`` object to its wrapper appobject
# will be used by e.g.:
# import base_module
# @ajaxfunc
# def foo(self):
# return 42
# assert foo(object) == 42
# vreg.register_and_replace(foo, base_module.older_foo)
implementation.__appobject__ = AnAjaxFunc
return implementation
[docs]def ajaxfunc(implementation=None, selector=yes(), output_type=None,
check_pageid=False, regid=None):
"""promote a standard function to an ``AjaxFunction`` appobject.
All parameters are optional:
:param selector: a custom selector object if needed, default is ``yes()``
:param output_type: either None, 'json' or 'xhtml' to customize output
content-type. Default is None
:param check_pageid: whether the function requires a valid `pageid` or not
to proceed. Default is False.
:param regid: a custom __regid__ for the created ``AjaxFunction`` object. Default
is to keep the wrapped function name.
``ajaxfunc`` can be used both as a standalone decorator:
.. sourcecode:: python
@ajaxfunc
def my_function(self):
return 42
or as a parametrizable decorator:
.. sourcecode:: python
@ajaxfunc(output_type='json')
def my_function(self):
return 42
"""
# if used as a parametrized decorator (e.g. @ajaxfunc(output_type='json'))
if implementation is None:
def _decorator(func):
return _ajaxfunc_factory(func, selector=selector,
_output_type=output_type,
_check_pageid=check_pageid,
regid=regid)
return _decorator
# else, used as a standalone decorator (i.e. @ajaxfunc)
return _ajaxfunc_factory(implementation, selector=selector,
_output_type=output_type,
_check_pageid=check_pageid, regid=regid)
###############################################################################
# Cubicweb remote functions for : #
# - appobject rendering #
# - user / page session data management #
###############################################################################
@ajaxfunc(output_type='xhtml')
def view(self):
# XXX try to use the page-content template
req = self._cw
rql = req.form.get('rql')
if rql:
rset = self._exec(rql)
elif 'eid' in req.form:
rset = self._cw.eid_rset(req.form['eid'])
else:
rset = None
vid = req.form.get('vid') or vid_from_rset(req, rset, self._cw.vreg.schema)
try:
viewobj = self._cw.vreg['views'].select(vid, req, rset=rset)
except NoSelectableObject:
vid = req.form.get('fallbackvid', 'noresult')
viewobj = self._cw.vreg['views'].select(vid, req, rset=rset)
viewobj.set_http_cache_headers()
if req.is_client_cache_valid():
return ''
return self._call_view(viewobj, paginate=req.form.pop('paginate', False))
@ajaxfunc(output_type='xhtml')
def component(self, compid, rql, registry='components', extraargs=None):
if rql:
rset = self._exec(rql)
else:
rset = None
# XXX while it sounds good, addition of the try/except below cause pb:
# when filtering using facets return an empty rset, the edition box
# isn't anymore selectable, as expected. The pb is that with the
# try/except below, we see a "an error occurred" message in the ui, while
# we don't see it without it. Proper fix would probably be to deal with
# this by allowing facet handling code to tell to js_component that such
# error is expected and should'nt be reported.
#try:
comp = self._cw.vreg[registry].select(compid, self._cw, rset=rset,
**optional_kwargs(extraargs))
#except NoSelectableObject:
# raise RemoteCallFailed('unselectable')
return self._call_view(comp, **optional_kwargs(extraargs))
@ajaxfunc(output_type='xhtml')
def render(self, registry, oid, eid=None,
selectargs=None, renderargs=None):
if eid is not None:
rset = self._cw.eid_rset(eid)
# XXX set row=0
elif self._cw.form.get('rql'):
rset = self._cw.execute(self._cw.form['rql'])
else:
rset = None
viewobj = self._cw.vreg[registry].select(oid, self._cw, rset=rset,
**optional_kwargs(selectargs))
return self._call_view(viewobj, **optional_kwargs(renderargs))
@ajaxfunc(output_type='json')
def i18n(self, msgids):
"""returns the translation of `msgid`"""
return [self._cw._(msgid) for msgid in msgids]
@ajaxfunc(output_type='json')
def format_date(self, strdate):
"""returns the formatted date for `msgid`"""
date = strptime(strdate, '%Y-%m-%d %H:%M:%S')
return self._cw.format_date(date)
@ajaxfunc(output_type='json')
def external_resource(self, resource):
"""returns the URL of the external resource named `resource`"""
return self._cw.uiprops[resource]
@ajaxfunc
def unload_page_data(self):
"""remove user's session data associated to current pageid"""
self._cw.session.data.pop(self._cw.pageid, None)
@ajaxfunc(output_type='json')
@deprecated("[3.13] use jQuery.cookie(cookiename, cookievalue, {path: '/'}) in js land instead")
def set_cookie(self, cookiename, cookievalue):
"""generates the Set-Cookie HTTP reponse header corresponding
to `cookiename` / `cookievalue`.
"""
cookiename, cookievalue = str(cookiename), str(cookievalue)
self._cw.set_cookie(cookiename, cookievalue)
@ajaxfunc
def delete_relation(self, rtype, subjeid, objeid):
rql = 'DELETE S %s O WHERE S eid %%(s)s, O eid %%(o)s' % rtype
self._cw.execute(rql, {'s': subjeid, 'o': objeid})
@ajaxfunc
def add_relation(self, rtype, subjeid, objeid):
rql = 'SET S %s O WHERE S eid %%(s)s, O eid %%(o)s' % rtype
self._cw.execute(rql, {'s': subjeid, 'o': objeid})
