# copyright 2003-2011 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/>.
"""abstract form classes for CubicWeb web client"""
__docformat__ = "restructuredtext en"
from warnings import warn
from logilab.common.decorators import iclassmethod
from logilab.common.deprecation import deprecated
from cubicweb.appobject import AppObject
from cubicweb.view import NOINDEX, NOFOLLOW
from cubicweb.web import httpcache, formfields, controller, formwidgets as fwdgs
class FormViewMixIn(object):
"""abstract form view mix-in"""
category = 'form'
http_cache_manager = httpcache.NoHTTPCacheManager
add_to_breadcrumbs = False
def html_headers(self):
"""return a list of html headers (eg something to be inserted between
<head> and </head> of the returned page
by default forms are neither indexed nor followed
"""
return [NOINDEX, NOFOLLOW]
def linkable(self):
"""override since forms are usually linked by an action,
so we don't want them to be listed by appli.possible_views
"""
return False
###############################################################################
class metafieldsform(type):
"""metaclass for FieldsForm to retrieve fields defined as class attributes
and put them into a single ordered list: '_fields_'.
"""
def __new__(mcs, name, bases, classdict):
allfields = []
for base in bases:
if hasattr(base, '_fields_'):
allfields += base._fields_
clsfields = (item for item in classdict.items()
if isinstance(item[1], formfields.Field))
for fieldname, field in sorted(clsfields, key=lambda x: x[1].creation_rank):
if not field.name:
field.set_name(fieldname)
allfields.append(field)
classdict['_fields_'] = allfields
return super(metafieldsform, mcs).__new__(mcs, name, bases, classdict)
class FieldNotFound(Exception):
"""raised by field_by_name when a field with the given name has not been
found
"""
class Form(AppObject):
__metaclass__ = metafieldsform
__registry__ = 'forms'
parent_form = None
force_session_key = None
domid = 'form'
copy_nav_params = False
control_fields = set( ('__form_id', '__errorurl', '__domid',
'__redirectpath', '_cwmsgid', '__message',
) )
def __init__(self, req, rset=None, row=None, col=None,
submitmsg=None, mainform=True, **kwargs):
# process kwargs first so we can properly pass them to Form and match
# order expectation (ie cw_extra_kwargs populated almost first)
hiddens, extrakw = self._process_kwargs(kwargs)
# now call ancestor init
super(Form, self).__init__(req, rset=rset, row=row, col=col, **extrakw)
# then continue with further specific initialization
self.fields = list(self.__class__._fields_)
for key, val in hiddens:
self.add_hidden(key, val)
if mainform:
formid = kwargs.pop('formvid', self.__regid__)
self.add_hidden(u'__form_id', formid)
self._posting = self._cw.form.get('__form_id') == formid
if mainform:
self.add_hidden(u'__errorurl', self.session_key())
self.add_hidden(u'__domid', self.domid)
self.restore_previous_post(self.session_key())
# XXX why do we need two different variables (mainform and copy_nav_params ?)
if self.copy_nav_params:
for param in controller.NAV_FORM_PARAMETERS:
if not param in kwargs:
value = req.form.get(param)
if value:
self.add_hidden(param, value)
if submitmsg is not None:
self.set_message(submitmsg)
def _process_kwargs(self, kwargs):
hiddens = []
extrakw = {}
# search for navigation parameters and customization of existing
# attributes; remaining stuff goes in extrakwargs
for key, val in kwargs.iteritems():
if key in controller.NAV_FORM_PARAMETERS:
hiddens.append( (key, val) )
elif key == 'redirect_path':
hiddens.append( (u'__redirectpath', val) )
elif hasattr(self.__class__, key) and not key[0] == '_':
setattr(self, key, val)
else:
extrakw[key] = val
return hiddens, extrakw
def set_message(self, submitmsg):
"""sets a submitmsg if exists, using _cwmsgid mechanism """
cwmsgid = self._cw.set_redirect_message(submitmsg)
self.add_hidden(u'_cwmsgid', cwmsgid)
@property
def root_form(self):
"""return the root form"""
if self.parent_form is None:
return self
return self.parent_form.root_form
@property
def form_valerror(self):
"""the validation error exception if any"""
if self.parent_form is None:
# unset if restore_previous_post has not be called
return getattr(self, '_form_valerror', None)
return self.parent_form.form_valerror
@property
def form_previous_values(self):
"""previously posted values (on validation error)"""
if self.parent_form is None:
# unset if restore_previous_post has not be called
return getattr(self, '_form_previous_values', {})
return self.parent_form.form_previous_values
@property
def posting(self):
"""return True if the form is being posted, False if it is being
generated.
"""
# XXX check behaviour on regeneration after error
if self.parent_form is None:
return self._posting
return self.parent_form.posting
@iclassmethod
def _fieldsattr(cls_or_self):
if isinstance(cls_or_self, type):
fields = cls_or_self._fields_
else:
fields = cls_or_self.fields
return fields
@iclassmethod
def field_by_name(cls_or_self, name, role=None):
"""Return field with the given name and role.
Raise :exc:`FieldNotFound` if the field can't be found.
"""
for field in cls_or_self._fieldsattr():
if field.name == name and field.role == role:
return field
raise FieldNotFound(name, role)
@iclassmethod
def fields_by_name(cls_or_self, name, role=None):
"""Return a list of fields with the given name and role."""
return [field for field in cls_or_self._fieldsattr()
if field.name == name and field.role == role]
@iclassmethod
def remove_field(cls_or_self, field):
"""Remove the given field."""
cls_or_self._fieldsattr().remove(field)
@iclassmethod
def append_field(cls_or_self, field):
"""Append the given field."""
cls_or_self._fieldsattr().append(field)
@iclassmethod
def insert_field_before(cls_or_self, field, name, role=None):
"""Insert the given field before the field of given name and role."""
bfield = cls_or_self.field_by_name(name, role)
fields = cls_or_self._fieldsattr()
fields.insert(fields.index(bfield), field)
@iclassmethod
def insert_field_after(cls_or_self, field, name, role=None):
"""Insert the given field after the field of given name and role."""
afield = cls_or_self.field_by_name(name, role)
fields = cls_or_self._fieldsattr()
fields.insert(fields.index(afield)+1, field)
@iclassmethod
def add_hidden(cls_or_self, name, value=None, **kwargs):
"""Append an hidden field to the form. `name`, `value` and extra keyword
arguments will be given to the field constructor. The inserted field is
returned.
"""
kwargs.setdefault('ignore_req_params', True)
kwargs.setdefault('widget', fwdgs.HiddenInput)
field = formfields.StringField(name=name, value=value, **kwargs)
if 'id' in kwargs:
# by default, hidden input don't set id attribute. If one is
# explicitly specified, ensure it will be set
field.widget.setdomid = True
cls_or_self.append_field(field)
return field
def session_key(self):
"""return the key that may be used to store / retreive data about a
previous post which failed because of a validation error
"""
if self.force_session_key is None:
return '%s#%s' % (self._cw.url(), self.domid)
return self.force_session_key
def restore_previous_post(self, sessionkey):
# get validation session data which may have been previously set.
# deleting validation errors here breaks form reloading (errors are
# no more available), they have to be deleted by application's publish
# method on successful commit
forminfo = self._cw.session.data.pop(sessionkey, None)
if forminfo:
self._form_previous_values = forminfo['values']
self._form_valerror = forminfo['error']
# if some validation error occurred on entity creation, we have to
# get the original variable name from its attributed eid
foreid = self.form_valerror.entity
for var, eid in forminfo['eidmap'].items():
if foreid == eid:
self.form_valerror.eid = var
break
else:
self.form_valerror.eid = foreid
else:
self._form_previous_values = {}
self._form_valerror = None
def field_error(self, field):
"""return field's error if specified in current validation exception"""
if self.form_valerror:
if field.eidparam and self.edited_entity.eid != self.form_valerror.eid:
return None
try:
return self.form_valerror.errors.pop(field.role_name())
except KeyError:
if field.role and field.name in self.form_valerror:
warn('%s: errors key of attribute/relation should be suffixed by "-<role>"'
% self.form_valerror.__class__, DeprecationWarning)
return self.form_valerror.errors.pop(field.name)
return None
def remaining_errors(self):
return sorted(self.form_valerror.errors.items())