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'
12 template = """<RSpec></RSpec>"""
17 def __init__(self, rspec="", namespaces={}):
19 self.parse_rspec(rspec, namespaces)
23 def create(self, type="advertisement"):
24 # eg. 2011-03-23T19:53:28Z
25 date_format = '%Y-%m-%dT%H:%M:%SZ'
26 now = datetime.utcnow()
27 generated_ts = now.strftime(date_format)
28 expires_ts = (now + timedelta(hours=1)).strftime(date_format)
29 self.parse_rspec(self.template, self.namespaces)
30 self.xml.set('valid_until', expires_ts)
31 self.xml.set('generated', generated_ts)
33 def parse_rspec(self, rspec, namespaces={}):
34 parser = etree.XMLParser(remove_blank_text=True)
36 tree = etree.parse(rspec, parser)
38 # 'rspec' file doesnt exist. 'rspec' is proably an xml string
40 tree = etree.parse(StringIO(rspec), parser)
42 raise InvalidRSpec('Must specify a xml file or xml string. Received: ' + rspec )
44 self.xml = tree.getroot()
46 self.namespaces = namespaces
48 def add_attribute(self, elem, name, value):
49 opt = etree.SubElement(elem, name)
52 def remove_attribute(self, elem, name, value):
54 opts = elem.iterfind(name)
61 def validate(self, schema):
62 relaxng_doc = etree.parse(schema)
63 relaxng = etree.RelaxNG(relaxng_doc)
64 if not relaxng(self.xml):
65 error = relaxng.error_log.last_error
66 message = "%s (line %s)" % (error.message, error.line)
67 raise InvalidRSpec(message)
75 return self.header + etree.tostring(self.xml, pretty_print=True)
77 def save(self, filename):
78 f = open(filename, 'w')
82 if __name__ == '__main__':