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#!/usr/bin/python
# Copyright (C) 2009, Sugar Labs
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 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, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
"""Activity information microformat parser.
Activity information is embedded in HTML/XHTML/XML pages using a
Resource Description Framework (RDF) http://www.w3.org/RDF/ .
An example::
<?xml version="1.0" encoding="UTF-8"?>
<RDF:RDF xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:em="http://www.mozilla.org/2004/em-rdf#">
<RDF:Description about="urn:mozilla:extension:bounce">
<em:updates>
<RDF:Seq>
<RDF:li resource="urn:mozilla:extension:bounce:7"/>
</RDF:Seq>
</em:updates>
</RDF:Description>
<RDF:Description about="urn:mozilla:extension:bounce:7">
<em:version>7</em:version>
<em:targetApplication>
<RDF:Description>
<em:id>{3ca105e0-2280-4897-99a0-c277d1b733d2}</em:id>
<em:minVersion>0.82</em:minVersion>
<em:maxVersion>0.84</em:maxVersion>
<em:updateLink>http://foo.xo</em:updateLink>
<em:updateSize>7</em:updateSize>
<em:updateHash>sha256:816a7c43b4f1ea4769c61c03ea4..</em:updateHash>
</RDF:Description>
</em:targetApplication>
</RDF:Description></RDF:RDF>
"""
import logging
import urllib2
from xml.etree.ElementTree import XML
import traceback
from jarabe import config
_FIND_DESCRIPTION = \
'.//{http://www.w3.org/1999/02/22-rdf-syntax-ns#}Description'
_FIND_VERSION = './/{http://www.mozilla.org/2004/em-rdf#}version'
_FIND_LINK = './/{http://www.mozilla.org/2004/em-rdf#}updateLink'
_FIND_SIZE = './/{http://www.mozilla.org/2004/em-rdf#}updateSize'
_UPDATE_PATH = 'http://activities.sugarlabs.org/services/update.php'
def _parse_url(url, bundle_id):
response = urllib2.urlopen(url)
document = XML(response.read())
if document.find(_FIND_DESCRIPTION) is None:
logging.debug('Bundle %s not available in the server for the version'
' %s' % (bundle_id, config.version))
return '0', None, 0
version = document.find(_FIND_VERSION).text
link = document.find(_FIND_LINK).text
size = long(document.find(_FIND_SIZE).text) * 1024
return version, link, size
def fetch_update_info(bundle):
"""Return a tuple of (version, link, size_in_bytes) for new version.
Returns ('0', None, 0) if no update is found for the platform version.
"""
url = '%s?id=%s&appVersion=%s' % \
(_UPDATE_PATH, bundle.get_bundle_id(), '0.84.1') #config.version)
return _parse_url(url, bundle.get_bundle_id())
#########################################################################
# Self-test code.
def _main():
"""Self-test."""
print _parse_url('%s?id=bounce' % _UPDATE_PATH, 'bounce')
if __name__ == '__main__':
_main()
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