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>"""
19 def __init__(self, rspec="", namespaces={}, type=None):
22 self.parse_rspec(rspec, namespaces)
26 def __get_template(self):
33 # eg. 2011-03-23T19:53:28Z
34 date_format = '%Y-%m-%dT%H:%M:%SZ'
35 now = datetime.utcnow()
36 generated_ts = now.strftime(date_format)
37 expires_ts = (now + timedelta(hours=1)).strftime(date_format)
38 self.parse_rspec(self.__get_template, self.namespaces)
39 self.xml.set('valid_until', expires_ts)
40 self.xml.set('generated', generated_ts)
42 def parse_rspec(self, rspec, namespaces={}):
44 parse rspec into etree
46 parser = etree.XMLParser(remove_blank_text=True)
48 tree = etree.parse(rspec, parser)
50 # 'rspec' file doesnt exist. 'rspec' is proably an xml string
52 tree = etree.parse(StringIO(rspec), parser)
54 raise InvalidRSpec('Must specify a xml file or xml string. Received: ' + rspec )
56 self.xml = tree.getroot()
58 self.namespaces = namespaces
60 def add_attribute(self, elem, name, value):
62 Add attribute to specified etree element
64 opt = etree.SubElement(elem, name)
67 def add_element(self, name, attrs={}, parent=None, text=""):
69 Generic wrapper around etree.SubElement(). Adds an element to
70 specified parent node. Adds element to root node is parent is
75 element = etree.SubElement(parent, name)
78 if isinstance(attrs, dict):
80 element.set(attr, attrs[attr])
83 def remove_attribute(self, elem, name, value):
85 Removes an attribute from an element
88 opts = elem.iterfind(name)
94 def merge(self, in_rspec):
97 def validate(self, schema):
99 Validate against rng schema
102 relaxng_doc = etree.parse(schema)
103 relaxng = etree.RelaxNG(relaxng_doc)
104 if not relaxng(self.xml):
105 error = relaxng.error_log.last_error
106 message = "%s (line %s)" % (error.message, error.line)
107 raise InvalidRSpec(message)
115 return self.header + etree.tostring(self.xml, pretty_print=True)
117 def save(self, filename):
118 f = open(filename, 'w')
119 f.write(self.toxml())
122 if __name__ == '__main__':