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>"""
20 def __init__(self, rspec="", namespaces={}, type=None, user_options={}):
22 self.user_options = user_options
24 self.parse_rspec(rspec, namespaces)
28 def __get_template(self):
35 # eg. 2011-03-23T19:53:28Z
36 date_format = '%Y-%m-%dT%H:%M:%SZ'
37 now = datetime.utcnow()
38 generated_ts = now.strftime(date_format)
39 expires_ts = (now + timedelta(hours=1)).strftime(date_format)
40 self.parse_rspec(self.__get_template(), self.namespaces)
41 self.xml.set('valid_until', expires_ts)
42 self.xml.set('generated', generated_ts)
44 def parse_rspec(self, rspec, namespaces={}):
46 parse rspec into etree
48 parser = etree.XMLParser(remove_blank_text=True)
51 tree = etree.parse(rspec, parser)
53 # 'rspec' file doesnt exist. 'rspec' is proably an xml string
55 tree = etree.parse(StringIO(rspec), parser)
57 raise InvalidRSpec('Must specify a xml file or xml string. Received: ' + rspec )
59 self.xml = tree.getroot()
61 self.namespaces = namespaces
63 def add_attribute(self, elem, name, value):
65 Add attribute to specified etree element
67 opt = etree.SubElement(elem, name)
70 def add_element(self, name, attrs={}, parent=None, text=""):
72 Generic wrapper around etree.SubElement(). Adds an element to
73 specified parent node. Adds element to root node is parent is
78 element = etree.SubElement(parent, name)
81 if isinstance(attrs, dict):
83 element.set(attr, attrs[attr])
86 def remove_attribute(self, elem, name, value):
88 Removes an attribute from an element
91 opts = elem.iterfind(name)
97 def merge(self, in_rspec):
100 def validate(self, schema):
102 Validate against rng schema
105 relaxng_doc = etree.parse(schema)
106 relaxng = etree.RelaxNG(relaxng_doc)
107 if not relaxng(self.xml):
108 error = relaxng.error_log.last_error
109 message = "%s (line %s)" % (error.message, error.line)
110 raise InvalidRSpec(message)
118 return self.header + etree.tostring(self.xml, pretty_print=True)
120 def save(self, filename):
121 f = open(filename, 'w')
122 f.write(self.toxml())
125 if __name__ == '__main__':