"""abstract form classes for CubicWeb web client
:organization: Logilab
:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
__docformat__ = "restructuredtext en"
from warnings import warn
from logilab.common.compat import any
from logilab.common.decorators import iclassmethod
from cubicweb.appobject import AppRsetObject
from cubicweb.selectors import yes, non_final_entity, match_kwargs, one_line_rset
from cubicweb.view import NOINDEX, NOFOLLOW
from cubicweb.common import tags
from cubicweb.web import INTERNAL_FIELD_VALUE, eid_param, stdmsgs
from cubicweb.web import formwidgets as fwdgs, httpcache
from cubicweb.web.controller import NAV_FORM_PARAMETERS
from cubicweb.web.formfields import (Field, StringField, RelationField,
HiddenInitialValueField)
class FormViewMixIn(object):
"""abstract form view mix-in"""
category = 'form'
controller = 'edit'
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
# XXX should disappear
class FormMixIn(object):
"""abstract form mix-in
XXX: you should inherit from this FIRST (obscure pb with super call)
"""
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
"""
return '%s#%s' % (self.req.url(), self.domid)
def __init__(self, req, rset, **kwargs):
super(FormMixIn, self).__init__(req, rset, **kwargs)
self.restore_previous_post(self.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.req.get_session_data(sessionkey, pop=True)
if forminfo:
# XXX remove req.data assigment once cw.web.widget is killed
self.req.data['formvalues'] = self.form_previous_values = forminfo['values']
self.req.data['formerrors'] = self.form_valerror = forminfo['errors']
self.req.data['displayederrors'] = self.form_displayed_errors = set()
# if some validation error occured 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
# XXX deprecated with new form system. Should disappear
domid = 'entityForm'
category = 'form'
controller = 'edit'
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
def button(self, label, klass='validateButton', tabindex=None, **kwargs):
if tabindex is None:
tabindex = self.req.next_tabindex()
return tags.input(value=label, klass=klass, **kwargs)
def action_button(self, label, onclick=None, __action=None, **kwargs):
if onclick is None:
onclick = "postForm('__action_%s', \'%s\', \'%s\')" % (
__action, label, self.domid)
return self.button(label, onclick=onclick, **kwargs)
def button_ok(self, label=None, type='submit', name='defaultsubmit',
**kwargs):
label = self.req._(label or stdmsgs.BUTTON_OK).capitalize()
return self.button(label, name=name, type=type, **kwargs)
def button_apply(self, label=None, type='button', **kwargs):
label = self.req._(label or stdmsgs.BUTTON_APPLY).capitalize()
return self.action_button(label, __action='apply', type=type, **kwargs)
def button_delete(self, label=None, type='button', **kwargs):
label = self.req._(label or stdmsgs.BUTTON_DELETE).capitalize()
return self.action_button(label, __action='delete', type=type, **kwargs)
def button_cancel(self, label=None, type='button', **kwargs):
label = self.req._(label or stdmsgs.BUTTON_CANCEL).capitalize()
return self.action_button(label, __action='cancel', type=type, **kwargs)
def button_reset(self, label=None, type='reset', name='__action_cancel',
**kwargs):
label = self.req._(label or stdmsgs.BUTTON_CANCEL).capitalize()
return self.button(label, type=type, **kwargs)
def need_multipart(self, entity, categories=('primary', 'secondary')):
"""return a boolean indicating if form's enctype should be multipart
"""
for rschema, _, x in entity.relations_by_category(categories):
if entity.get_widget(rschema, x).need_multipart:
return True
# let's find if any of our inlined entities needs multipart
for rschema, targettypes, x in entity.relations_by_category('inlineview'):
assert len(targettypes) == 1, \
"I'm not able to deal with several targets and inlineview"
ttype = targettypes[0]
inlined_entity = self.vreg.etype_class(ttype)(self.req, None, None)
for irschema, _, x in inlined_entity.relations_by_category(categories):
if inlined_entity.get_widget(irschema, x).need_multipart:
return True
return False
def error_message(self):
"""return formatted error message
This method should be called once inlined field errors has been consumed
"""
errex = self.req.data.get('formerrors') or self.form_valerror
# get extra errors
if errex is not None:
errormsg = self.req._('please correct the following errors:')
displayed = self.req.data.get('displayederrors') or self.form_displayed_errors
errors = sorted((field, err) for field, err in errex.errors.items()
if not field in displayed)
if errors:
if len(errors) > 1:
templstr = '<li>%s</li>\n'
else:
templstr = ' %s\n'
for field, err in errors:
if field is None:
errormsg += templstr % err
else:
errormsg += templstr % '%s: %s' % (self.req._(field), err)
if len(errors) > 1:
errormsg = '<ul>%s</ul>' % errormsg
return u'<div class="errorMessage">%s</div>' % errormsg
return u''
###############################################################################
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], 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 FieldsForm(FormMixIn, AppRsetObject):
__metaclass__ = metafieldsform
__registry__ = 'forms'
__select__ = yes()
is_subform = False
# attributes overrideable through __init__
internal_fields = ('__errorurl',) + NAV_FORM_PARAMETERS
needs_js = ('cubicweb.ajax.js', 'cubicweb.edition.js',)
needs_css = ('cubicweb.form.css',)
domid = 'form'
title = None
action = None
onsubmit = "return freezeFormButtons('%(domid)s');"
cssclass = None
cssstyle = None
cwtarget = None
redirect_path = None
set_error_url = True
copy_nav_params = False
form_buttons = None # form buttons (button widgets instances)
form_renderer_id = 'default'
def __init__(self, req, rset=None, row=None, col=None, submitmsg=None,
**kwargs):
super(FieldsForm, self).__init__(req, rset, row=row, col=col)
self.fields = list(self.__class__._fields_)
for key, val in kwargs.items():
if key in NAV_FORM_PARAMETERS:
self.form_add_hidden(key, val)
else:
assert hasattr(self.__class__, key) and not key[0] == '_', key
setattr(self, key, val)
if self.set_error_url:
self.form_add_hidden('__errorurl', self.session_key())
if self.copy_nav_params:
for param in NAV_FORM_PARAMETERS:
if not param in kwargs:
value = req.form.get(param)
if value:
self.form_add_hidden(param, value)
if submitmsg is not None:
self.form_add_hidden('__message', submitmsg)
self.context = None
if 'domid' in kwargs:# session key changed
self.restore_previous_post(self.session_key())
@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='subject'):
"""return field with the given name and role.
Raise 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)
@iclassmethod
def fields_by_name(cls_or_self, name, role='subject'):
"""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 a field from form class or instance"""
cls_or_self._fieldsattr().remove(field)
@iclassmethod
def append_field(cls_or_self, field):
"""append a field to form class or instance"""
cls_or_self._fieldsattr().append(field)
@iclassmethod
def insert_field_before(cls_or_self, new_field, name, role='subject'):
field = cls_or_self.field_by_name(name, role)
fields = cls_or_self._fieldsattr()
fields.insert(fields.index(field), new_field)
@iclassmethod
def insert_field_after(cls_or_self, new_field, name, role='subject'):
field = cls_or_self.field_by_name(name, role)
fields = cls_or_self._fieldsattr()
fields.insert(fields.index(field)+1, new_field)
@property
def form_needs_multipart(self):
"""true if the form needs enctype=multipart/form-data"""
return any(field.needs_multipart for field in self.fields)
def form_add_hidden(self, name, value=None, **kwargs):
"""add an hidden field to the form"""
field = StringField(name=name, widget=fwdgs.HiddenInput, initial=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
self.append_field(field)
return field
def add_media(self):
"""adds media (CSS & JS) required by this widget"""
if self.needs_js:
self.req.add_js(self.needs_js)
if self.needs_css:
self.req.add_css(self.needs_css)
def form_render(self, **values):
"""render this form, using the renderer given in args or the default
FormRenderer()
"""
renderer = values.pop('renderer', None)
if renderer is None:
renderer = self.form_default_renderer()
return renderer.render(self, values)
def form_default_renderer(self):
return self.vreg.select_object('formrenderers', self.form_renderer_id,
self.req, self.rset,
row=self.row, col=self.col)
def form_build_context(self, rendervalues=None):
"""build form context values (the .context attribute which is a
dictionary with field instance as key associated to a dictionary
containing field 'name' (qualified), 'id', 'value' (for display, always
a string).
rendervalues is an optional dictionary containing extra kwargs given to
form_render()
"""
self.context = context = {}
# ensure rendervalues is a dict
if rendervalues is None:
rendervalues = {}
# use a copy in case fields are modified while context is build (eg
# __linkto handling for instance)
for field in self.fields[:]:
for field in field.actual_fields(self):
field.form_init(self)
value = self.form_field_display_value(field, rendervalues)
context[field] = {'value': value,
'name': self.form_field_name(field),
'id': self.form_field_id(field),
}
def form_field_display_value(self, field, rendervalues, load_bytes=False):
"""return field's *string* value to use for display
looks in
1. previously submitted form values if any (eg on validation error)
2. req.form
3. extra kw args given to render_form
4. field's typed value
values found in 1. and 2. are expected te be already some 'display'
value while those found in 3. and 4. are expected to be correctly typed.
"""
value = self._req_display_value(field)
if value is None:
if field.name in rendervalues:
value = rendervalues[field.name]
else:
value = self.form_field_value(field, load_bytes)
if callable(value):
value = value(self)
if value != INTERNAL_FIELD_VALUE:
value = field.format_value(self.req, value)
return value
def _req_display_value(self, field):
qname = self.form_field_name(field)
if qname in self.form_previous_values:
return self.form_previous_values[qname]
if qname in self.req.form:
return self.req.form[qname]
if field.name in self.req.form:
return self.req.form[field.name]
return None
def form_field_value(self, field, load_bytes=False):
"""return field's *typed* value"""
myattr = '%s_%s_default' % (field.role, field.name)
if hasattr(self, myattr):
return getattr(self, myattr)()
value = field.initial
if callable(value):
value = value(self)
return value
def form_field_error(self, field):
"""return validation error for widget's field, if any"""
if self._field_has_error(field):
self.form_displayed_errors.add(field.name)
return u'<span class="error">%s</span>' % self.form_valerror.errors[field.name]
return u''
def form_field_format(self, field):
"""return MIME type used for the given (text or bytes) field"""
return self.req.property_value('ui.default-text-format')
def form_field_encoding(self, field):
"""return encoding used for the given (text) field"""
return self.req.encoding
def form_field_name(self, field):
"""return qualified name for the given field"""
return field.name
def form_field_id(self, field):
"""return dom id for the given field"""
return field.id
def form_field_vocabulary(self, field, limit=None):
"""return vocabulary for the given field. Should be overriden in
specific forms using fields which requires some vocabulary
"""
raise NotImplementedError
def _field_has_error(self, field):
"""return true if the field has some error in given validation exception
"""
return self.form_valerror and field.name in self.form_valerror.errors
class EntityFieldsForm(FieldsForm):
__select__ = (match_kwargs('entity') | (one_line_rset & non_final_entity()))
internal_fields = FieldsForm.internal_fields + ('__type', 'eid', '__maineid')
domid = 'entityForm'
def __init__(self, *args, **kwargs):
self.edited_entity = kwargs.pop('entity', None)
msg = kwargs.pop('submitmsg', None)
super(EntityFieldsForm, self).__init__(*args, **kwargs)
if self.edited_entity is None:
self.edited_entity = self.complete_entity(self.row or 0, self.col or 0)
self.form_add_hidden('__type', eidparam=True)
self.form_add_hidden('eid')
if msg:
# If we need to directly attach the new object to another one
self.form_add_hidden('__message', msg)
if not self.is_subform:
for linkto in self.req.list_form_param('__linkto'):
self.form_add_hidden('__linkto', linkto)
msg = '%s %s' % (msg, self.req._('and linked'))
# in case of direct instanciation
self.schema = self.edited_entity.schema
self.vreg = self.edited_entity.vreg
def _field_has_error(self, field):
"""return true if the field has some error in given validation exception
"""
return super(EntityFieldsForm, self)._field_has_error(field) \
and self.form_valerror.eid == self.edited_entity.eid
def _relation_vocabulary(self, rtype, targettype, role,
limit=None, done=None):
"""return unrelated entities for a given relation and target entity type
for use in vocabulary
"""
if done is None:
done = set()
rset = self.edited_entity.unrelated(rtype, targettype, role, limit)
res = []
for entity in rset.entities():
if entity.eid in done:
continue
done.add(entity.eid)
res.append((entity.view('combobox'), entity.eid))
return res
def _req_display_value(self, field):
value = super(EntityFieldsForm, self)._req_display_value(field)
if value is None:
value = self.edited_entity.linked_to(field.name, field.role)
if value:
searchedvalues = ['%s:%s:%s' % (field.name, eid, field.role)
for eid in value]
# remove associated __linkto hidden fields
for field in self.fields_by_name('__linkto'):
if field.initial in searchedvalues:
self.remove_field(field)
else:
value = None
return value
def _form_field_default_value(self, field, load_bytes):
defaultattr = 'default_%s' % field.name
if hasattr(self.edited_entity, defaultattr):
# XXX bw compat, default_<field name> on the entity
warn('found %s on %s, should be set on a specific form'
% (defaultattr, self.edited_entity.id), DeprecationWarning)
value = getattr(self.edited_entity, defaultattr)
if callable(value):
value = value()
else:
value = super(EntityFieldsForm, self).form_field_value(field,
load_bytes)
return value
def form_default_renderer(self):
return self.vreg.select_object('formrenderers', self.form_renderer_id,
self.req, self.rset,
row=self.row, col=self.col,
entity=self.edited_entity)
def form_build_context(self, values=None):
"""overriden to add edit[s|o] hidden fields and to ensure schema fields
have eidparam set to True
edit[s|o] hidden fields are used to indicate the value for the
associated field before the (potential) modification made when
submitting the form.
"""
eschema = self.edited_entity.e_schema
for field in self.fields[:]:
for field in field.actual_fields(self):
fieldname = field.name
if fieldname != 'eid' and (
(eschema.has_subject_relation(fieldname) or
eschema.has_object_relation(fieldname))):
field.eidparam = True
self.fields.append(HiddenInitialValueField(field))
return super(EntityFieldsForm, self).form_build_context(values)
def form_field_value(self, field, load_bytes=False):
"""return field's *typed* value
overriden to deal with
* special eid / __type / edits- / edito- fields
* lookup for values on edited entities
"""
attr = field.name
entity = self.edited_entity
if attr == 'eid':
return entity.eid
if not field.eidparam:
return super(EntityFieldsForm, self).form_field_value(field, load_bytes)
if attr.startswith('edits-') or attr.startswith('edito-'):
# edit[s|o]- fieds must have the actual value stored on the entity
assert hasattr(field, 'visible_field')
vfield = field.visible_field
assert vfield.eidparam
if entity.has_eid():
return self.form_field_value(vfield)
return INTERNAL_FIELD_VALUE
if attr == '__type':
return entity.id
if self.schema.rschema(attr).is_final():
attrtype = entity.e_schema.destination(attr)
if attrtype == 'Password':
return entity.has_eid() and INTERNAL_FIELD_VALUE or ''
if attrtype == 'Bytes':
if entity.has_eid():
if load_bytes:
return getattr(entity, attr)
# XXX value should reflect if some file is already attached
return True
return False
if entity.has_eid() or attr in entity:
value = getattr(entity, attr)
else:
value = self._form_field_default_value(field, load_bytes)
return value
# non final relation field
if entity.has_eid() or entity.relation_cached(attr, field.role):
value = [r[0] for r in entity.related(attr, field.role)]
else:
value = self._form_field_default_value(field, load_bytes)
return value
def form_field_format(self, field):
"""return MIME type used for the given (text or bytes) field"""
entity = self.edited_entity
if field.eidparam and entity.e_schema.has_metadata(field.name, 'format') and (
entity.has_eid() or '%s_format' % field.name in entity):
return self.edited_entity.attr_metadata(field.name, 'format')
return self.req.property_value('ui.default-text-format')
def form_field_encoding(self, field):
"""return encoding used for the given (text) field"""
entity = self.edited_entity
if field.eidparam and entity.e_schema.has_metadata(field.name, 'encoding') and (
entity.has_eid() or '%s_encoding' % field.name in entity):
return self.edited_entity.attr_metadata(field.name, 'encoding')
return super(EntityFieldsForm, self).form_field_encoding(field)
def form_field_name(self, field):
"""return qualified name for the given field"""
if field.eidparam:
return eid_param(field.name, self.edited_entity.eid)
return field.name
def form_field_id(self, field):
"""return dom id for the given field"""
if field.eidparam:
return eid_param(field.id, self.edited_entity.eid)
return field.id
def form_field_vocabulary(self, field, limit=None):
"""return vocabulary for the given field"""
role, rtype = field.role, field.name
method = '%s_%s_vocabulary' % (role, rtype)
try:
vocabfunc = getattr(self, method)
except AttributeError:
try:
# XXX bw compat, <role>_<rtype>_vocabulary on the entity
vocabfunc = getattr(self.edited_entity, method)
except AttributeError:
vocabfunc = getattr(self, '%s_relation_vocabulary' % role)
else:
warn('found %s on %s, should be set on a specific form'
% (method, self.edited_entity.id), DeprecationWarning)
# NOTE: it is the responsibility of `vocabfunc` to sort the result
# (direclty through RQL or via a python sort). This is also
# important because `vocabfunc` might return a list with
# couples (label, None) which act as separators. In these
# cases, it doesn't make sense to sort results afterwards.
return vocabfunc(rtype, limit)
def subject_relation_vocabulary(self, rtype, limit=None):
"""defaut vocabulary method for the given relation, looking for
relation's object entities (i.e. self is the subject)
"""
entity = self.edited_entity
if isinstance(rtype, basestring):
rtype = entity.schema.rschema(rtype)
done = None
assert not rtype.is_final(), rtype
if entity.has_eid():
done = set(e.eid for e in getattr(entity, str(rtype)))
result = []
rsetsize = None
for objtype in rtype.objects(entity.e_schema):
if limit is not None:
rsetsize = limit - len(result)
result += self._relation_vocabulary(rtype, objtype, 'subject',
rsetsize, done)
if limit is not None and len(result) >= limit:
break
return result
def object_relation_vocabulary(self, rtype, limit=None):
"""defaut vocabulary method for the given relation, looking for
relation's subject entities (i.e. self is the object)
"""
entity = self.edited_entity
if isinstance(rtype, basestring):
rtype = entity.schema.rschema(rtype)
done = None
if entity.has_eid():
done = set(e.eid for e in getattr(entity, 'reverse_%s' % rtype))
result = []
rsetsize = None
for subjtype in rtype.subjects(entity.e_schema):
if limit is not None:
rsetsize = limit - len(result)
result += self._relation_vocabulary(rtype, subjtype, 'object',
rsetsize, done)
if limit is not None and len(result) >= limit:
break
return result
def subject_in_state_vocabulary(self, rtype, limit=None):
"""vocabulary method for the in_state relation, looking for relation's
object entities (i.e. self is the subject) according to initial_state,
state_of and next_state relation
"""
entity = self.edited_entity
if not entity.has_eid() or not entity.in_state:
# get the initial state
rql = 'Any S where S state_of ET, ET name %(etype)s, ET initial_state S'
rset = self.req.execute(rql, {'etype': str(entity.e_schema)})
if rset:
return [(rset.get_entity(0, 0).view('combobox'), rset[0][0])]
return []
results = []
for tr in entity.in_state[0].transitions(entity):
state = tr.destination_state[0]
results.append((state.view('combobox'), state.eid))
return sorted(results)
class CompositeForm(FieldsForm):
"""form composed for sub-forms"""
form_renderer_id = 'composite'
def __init__(self, *args, **kwargs):
super(CompositeForm, self).__init__(*args, **kwargs)
self.forms = []
def form_add_subform(self, subform):
"""mark given form as a subform and append it"""
subform.is_subform = True
self.forms.append(subform)