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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
from jarabe import config
_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'
class ASLOParser():
"""XML parser to pull out data expressed in our aslo format."""
def __init__(self, xml_data):
self.elem = XML(xml_data)
self.version = 0
self.link = None
self.size = 0
def parse(self):
try:
self.version = self.elem.find(_FIND_VERSION).text
self.link = self.elem.find(_FIND_LINK).text
self.size = long(self.elem.find(_FIND_SIZE).text) * 1024
except Exception, e:
logging.warning("Can't parse update data: %s" % e)
self.version = 0
self.link = None
self.size = 0
def parse_aslo(xml_data):
"""Parse the activity information embedded in the given string
containing XML data. Returns a list containing the activity version,
size and url.
"""
ap = ASLOParser(xml_data)
ap.parse()
return ap.version, ap.link, ap.size
def parse_url(url):
"""Parse the activity information at the given URL. Returns the same
information as `parse_xml` does, and raises the same exceptions.
The `urlopen_args` can be any keyword arguments accepted by
`bitfrost.util.urlrange.urlopen`."""
logging.debug('Update uri=%s' % url)
response = urllib2.urlopen(url)
return parse_aslo(response.read())
def fetch_update_info(bundle):
"""Return a tuple of new version, url for new version.
All the information about the new version is `None` if no newer
update can be found.
"""
url = '%s?id=%s&appVersion=%s' % \
(_UPDATE_PATH, bundle.get_bundle_id(), config.version)
return parse_url(url)
#########################################################################
# Self-test code.
def _main():
"""Self-test."""
print parse_url('%s?id=bounce' % _UPDATE_PATH)
if __name__ == '__main__':
_main()
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