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#!/usr/bin/python3
#
# Planet Filter - feed filter for newsfeed aggregators
# Copyright (C) 2010, 2015 Francois Marier <francois@fmarier.org>
#
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# http://docs.python.org/library/xml.dom.minidom.html
# http://docs.python.org/library/xml.dom.html
# http://docs.python.org/library/configparser.html
rdfns = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'
VERSION = '0.1.1'
import argparse
import configparser as cp
from urllib.request import urlopen
import xml.dom.minidom as minidom
def delete_node(node):
parent = node.parentNode
parent.removeChild(node)
def delete_rss1_item(item):
# Delete refernce to the item
rdfabout = item.getAttributeNS(rdfns, 'about')
rdfnode = item.parentNode
channel = rdfnode.getElementsByTagName('channel').item(0)
rdfseq = channel.getElementsByTagNameNS(rdfns, 'Seq').item(0)
rdflist = rdfseq.getElementsByTagNameNS(rdfns, 'li')
for li in rdflist:
if li.getAttributeNS(rdfns, 'resource') == rdfabout:
delete_node(li)
# Delete the item
delete_node(item)
def is_rss2(xmldocument):
rsslist = xmldocument.getElementsByTagName('rss')
if rsslist.length != 1:
return False
else:
# Check the version
rss = rsslist.item(0)
if rss.getAttribute('version') != '2.0':
return False
else:
return True
def is_rss1(xmldocument):
rdflist = xmldocument.getElementsByTagNameNS(rdfns, 'RDF')
if rdflist.length != 1:
return False
else:
# Check the namespace/version
rdf = rdflist.item(0)
if rdf.getAttribute('xmlns').find('purl.org/rss/1.0') > -1:
return True
else:
return False
def is_atom(xmldocument):
feedlist = xmldocument.getElementsByTagName('feed')
if feedlist.length != 1:
return False
else:
# Check the namespace/version
feed = feedlist.item(0)
if feed.getAttribute('xmlns').find('w3.org/2005/Atom') > -1:
return True
else:
return False
def filter_rss2(xmldocument, blacklist):
rss = xmldocument.getElementsByTagName('rss').item(0)
channel = rss.getElementsByTagName('channel').item(0)
items = channel.getElementsByTagName('item')
for item in items:
titles = item.getElementsByTagName('title')
for title in titles:
textnode = title.firstChild
if minidom.Node.TEXT_NODE == textnode.nodeType:
titlestring = textnode.nodeValue
for author in blacklist:
if 0 == titlestring.find(author):
delete_node(item)
return True
def filter_atom(xmldocument, blacklist):
feed = xmldocument.getElementsByTagName('feed').item(0)
entries = feed.getElementsByTagName('entry')
for entry in entries:
authors = entry.getElementsByTagName('author')
for author in authors:
name = author.getElementsByTagName('name').item(0)
textnode = name.firstChild
if minidom.Node.TEXT_NODE == textnode.nodeType:
authorstring = textnode.nodeValue
for author in blacklist:
if 0 == authorstring.find(author):
delete_node(entry)
return True
def filter_rss1(xmldocument, blacklist):
rdf = xmldocument.getElementsByTagNameNS(rdfns, 'RDF').item(0)
items = rdf.getElementsByTagName('item')
for item in items:
titles = item.getElementsByTagName('title')
for title in titles:
textnode = title.firstChild
if minidom.Node.TEXT_NODE == textnode.nodeType:
titlestring = textnode.nodeValue
for author in blacklist:
if 0 == titlestring.find(author):
delete_rss1_item(item)
return True
def filter_feed(xmldocument, blacklist):
if is_rss2(xmldocument):
return filter_rss2(xmldocument, blacklist)
elif is_rss1(xmldocument):
return filter_rss1(xmldocument, blacklist)
elif is_atom(xmldocument):
return filter_atom(xmldocument, blacklist)
else:
print('Unsupported feed type')
return False
def process_config(configfile, outfile):
# TODO: check the return values for all of these
config = cp.SafeConfigParser()
config.read(configfile)
url = config.get('feed', 'url')
blacklist = config.get('blacklist', 'authors').split("\n")
# TODO: check the return values for all of these
fh = urlopen(url)
contents = fh.read()
document = minidom.parseString(contents)
if blacklist and blacklist != ['']:
filter_feed(document, blacklist)
if outfile:
# TODO: make sure we're not overwriting the file (unless --force)
with open(outfile, 'w') as f:
f.write(document.toxml())
else:
print(document.toxml())
def main():
parser = argparse.ArgumentParser(
description='Blacklist-based filter for blog aggregators.')
parser.add_argument('configfile', type=str,
help='the config file to parse')
parser.add_argument('-o', '--output', metavar='file',
required=False, type=str,
help='the output filename (default: <STDOUT>)')
parser.add_argument('-V', '--version', action='version',
version='planetfilter %s' % VERSION)
args = parser.parse_args()
process_config(args.configfile, args.output)
main()
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