[hooks/security] provide attribute "add" permission
As of today, the update permission on attributes is checked at entity
*creation* time. This forbids using update permissions the proper way.
We set it to be checked at entity update time only.
We introduce a specific 'add' permission rule for attributes.
For backward compatibility, its default value will be the same as the
current 'update' permission.
Notes:
* needs a new yams version (ticket #149216)
* introduces two new 'add_permissions' rdefs (attribute - group|rqlexpr)
* if the update permission was () and the bw compat kicks in, the rule
is not enforced, to avoid un-creatable entity types -- this
restriction will be lifted when the bw compat is gone
* small internal refactoring on check_entity_attributes
* one small pre 3.6.1 bw compat snippet must be removed from schemaserial
Closes #2965518.
# 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/>.
"""Simple captcha library, based on PIL. Monkey patch functions in this module
if you want something better...
"""
__docformat__ = "restructuredtext en"
from random import randint, choice
from cStringIO import StringIO
import Image, ImageFont, ImageDraw, ImageFilter
from time import time
from cubicweb import tags
from cubicweb.web import ProcessFormError, formwidgets as fw
def pil_captcha(text, fontfile, fontsize):
"""Generate a captcha image. Return a PIL image object.
adapted from http://code.activestate.com/recipes/440588/
"""
# randomly select the foreground color
fgcolor = randint(0, 0xffff00)
# make the background color the opposite of fgcolor
bgcolor = fgcolor ^ 0xffffff
# create a font object
font = ImageFont.truetype(fontfile, fontsize)
# determine dimensions of the text
dim = font.getsize(text)
# create a new image slightly larger that the text
img = Image.new('RGB', (dim[0]+5, dim[1]+5), bgcolor)
draw = ImageDraw.Draw(img)
# draw 100 random colored boxes on the background
x, y = img.size
for num in xrange(100):
draw.rectangle((randint(0, x), randint(0, y),
randint(0, x), randint(0, y)),
fill=randint(0, 0xffffff))
# add the text to the image
draw.text((3, 3), text, font=font, fill=fgcolor)
img = img.filter(ImageFilter.EDGE_ENHANCE_MORE)
return img
def captcha(fontfile, fontsize, size=5, format='JPEG'):
"""Generate an arbitrary text, return it together with a buffer containing
the captcha image for the text
"""
text = u''.join(choice('QWERTYUOPASDFGHJKLZXCVBNM') for i in range(size))
img = pil_captcha(text, fontfile, fontsize)
out = StringIO()
img.save(out, format)
out.seek(0)
return text, out
class CaptchaWidget(fw.TextInput):
def render(self, form, field, renderer=None):
# t=int(time()*100) to make sure img is not cached
src = form._cw.build_url('view', vid='captcha', t=int(time()*100),
captchakey=field.input_name(form))
img = tags.img(src=src, alt=u'captcha')
img = u'<div class="captcha">%s</div>' % img
return img + super(CaptchaWidget, self).render(form, field, renderer)
def process_field_data(self, form, field):
captcha = form._cw.session.data.pop(field.input_name(form), None)
val = super(CaptchaWidget, self).process_field_data(form, field)
if val is None:
return val # required will be checked by field
if captcha is None:
msg = form._cw._('unable to check captcha, please try again')
raise ProcessFormError(msg)
elif val.lower() != captcha.lower():
msg = form._cw._('incorrect captcha value')
raise ProcessFormError(msg)
return val