[selectors] modify workflow selectors: is_in_state, on_transition
- factorize `is_on_state` selector
- add new `on_transition` selector
Especially useful to match pending transitions to enable notifications when
your workflow allows several transition to the same states.
Note that if workflow `change_state` adapter method is used, this selector
will not be triggered.
In debug mode:
These both selectors will check against the entity current workflow if expected
values given in selector argument are valid.
ValueError exception will be raised for unmatching state/transition
names against the current workflow (generic etype workflow).
(check against custom workflow is not implemented)
# copyright 2003-2010 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