3 from StringIO import StringIO
4 from datetime import datetime, timedelta
5 from sfa.util.xrn import *
6 from sfa.util.plxrn import hostname_to_urn
7 from sfa.util.config import Config
8 from sfa.util.faults import SfaNotImplemented, InvalidRSpec
11 header = '<?xml version="1.0"?>\n'
20 def __init__(self, rspec="", namespaces={}):
22 self.parse_rspec(rspec, namespaces)
26 def create(self, type="advertisement"):
27 # eg. 2011-03-23T19:53:28Z
28 date_format = '%Y-%m-%dT%H:%M:%SZ'
29 now = datetime.utcnow()
30 generated_ts = now.strftime(date_format)
31 expires_ts = (now + timedelta(hours=1)).strftime(date_format)
32 self.parse_rspec(self.template, self.namespaces)
33 self.xml.set('valid_until', expires_ts)
34 self.xml.set('generated', generated_ts)
36 def parse_rspec(self, rspec, namespaces={}):
37 parser = etree.XMLParser(remove_blank_text=True)
39 tree = etree.parse(rspec, parser)
41 # 'rspec' file doesnt exist. 'rspec' is proably an xml string
43 tree = etree.parse(StringIO(rspec), parser)
45 raise InvalidRSpec('Must specify a xml file or xml string. Received: ' + rspec )
47 self.xml = tree.getroot()
49 self.namespaces = namespaces
51 def add_attribute(self, elem, name, value):
52 opt = etree.SubElement(elem, name)
55 def remove_attribute(self, elem, name, value):
57 opts = elem.iterfind(name)
64 def validate(self, schema):
65 relaxng_doc = etree.parse(schema)
66 relaxng = etree.RelaxNG(relaxng_doc)
67 if not relaxng(self.xml):
68 error = relaxng.error_log.last_error
69 message = "%s (line %s)" % (error.message, error.line)
70 raise InvalidRSpec(message)
78 return self.header + etree.tostring(self.xml, pretty_print=True)
80 def save(self, filename):
81 f = open(filename, 'w')
85 if __name__ == '__main__':