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# Copyright (c) 2011, 2012 Free Software Foundation
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
# This program 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 Affero General Public License for more details.
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# This project incorporates work covered by the following copyright and permission notice:
# Copyright (c) 2009, Julien Fache
# All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# * Neither the name of the author nor the names of other
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# OF THE POSSIBILITY OF SUCH DAMAGE.
"""XML-RPC methods of Objectapp Pingback"""
from urllib2 import urlopen
from urllib2 import URLError
from urllib2 import HTTPError
from urlparse import urlsplit
from django.contrib import comments
from django.utils.html import strip_tags
from django.contrib.sites.models import Site
from django.core.urlresolvers import resolve
from django.core.urlresolvers import Resolver404
from django.utils.translation import ugettext as _
from django.contrib.contenttypes.models import ContentType
from objectapp.models import Gbobject
from objectapp.settings import PINGBACK_CONTENT_LENGTH
from BeautifulSoup import BeautifulSoup
from django_xmlrpc.decorators import xmlrpc_func
UNDEFINED_ERROR = 0
SOURCE_DOES_NOT_EXIST = 16
SOURCE_DOES_NOT_LINK = 17
TARGET_DOES_NOT_EXIST = 32
TARGET_IS_NOT_PINGABLE = 33
PINGBACK_ALREADY_REGISTERED = 48
def generate_pingback_content(soup, target, max_length, trunc_char='...'):
"""Generate a description text for the pingback"""
link = soup.find('a', href=target)
content = strip_tags(unicode(link.findParent()))
index = content.index(link.string)
if len(content) > max_length:
middle = max_length / 2
start = index - middle
end = index + middle
if start <= 0:
end -= start
extract = content[0:end]
else:
extract = '%s%s' % (trunc_char, content[start:end])
if end < len(content):
extract += trunc_char
return extract
return content
@xmlrpc_func(returns='string', args=['string', 'string'])
def pingback_ping(source, target):
"""pingback.ping(sourceURI, targetURI) => 'Pingback message'
Notifies the server that a link has been added to sourceURI,
pointing to targetURI.
See: http://hixie.ch/specs/pingback/pingback-1.0"""
try:
if source == target:
return UNDEFINED_ERROR
site = Site.objects.get_current()
try:
document = ''.join(urlopen(source).readlines())
except (HTTPError, URLError):
return SOURCE_DOES_NOT_EXIST
if not target in document:
return SOURCE_DOES_NOT_LINK
scheme, netloc, path, query, fragment = urlsplit(target)
if netloc != site.domain:
return TARGET_DOES_NOT_EXIST
try:
view, args, kwargs = resolve(path)
except Resolver404:
return TARGET_DOES_NOT_EXIST
try:
gbobject = Gbobject.published.get(
slug=kwargs['slug'],
creation_date__year=kwargs['year'],
creation_date__month=kwargs['month'],
creation_date__day=kwargs['day'])
if not gbobject.pingback_enabled:
return TARGET_IS_NOT_PINGABLE
except (KeyError, Gbobject.DoesNotExist):
return TARGET_IS_NOT_PINGABLE
soup = BeautifulSoup(document)
title = soup.find('title')
title = title and strip_tags(title) or _('No title')
description = generate_pingback_content(soup, target,
PINGBACK_CONTENT_LENGTH)
comment, created = comments.get_model().objects.get_or_create(
content_type=ContentType.objects.get_for_model(Gbobject),
object_pk=gbobject.pk, user_url=source, site=site,
defaults={'comment': description, 'user_name': title})
if created:
user = gbobject.authors.all()[0]
comment.flags.create(user=user, flag='pingback')
return 'Pingback from %s to %s registered.' % (source, target)
return PINGBACK_ALREADY_REGISTERED
except:
return UNDEFINED_ERROR
@xmlrpc_func(returns='string[]', args=['string'])
def pingback_extensions_get_pingbacks(target):
"""pingback.extensions.getPingbacks(url) => '[url, url, ...]'
Returns an array of URLs that link to the specified url.
See: http://www.aquarionics.com/misc/archives/blogite/0198.html"""
site = Site.objects.get_current()
scheme, netloc, path, query, fragment = urlsplit(target)
if netloc != site.domain:
return TARGET_DOES_NOT_EXIST
try:
view, args, kwargs = resolve(path)
except Resolver404:
return TARGET_DOES_NOT_EXIST
try:
gbobject = Gbobject.published.get(
slug=kwargs['slug'],
creation_date__year=kwargs['year'],
creation_date__month=kwargs['month'],
creation_date__day=kwargs['day'])
except (KeyError, Gbobject.DoesNotExist):
return TARGET_IS_NOT_PINGABLE
return [pingback.user_url for pingback in gbobject.pingbacks]
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