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# $Id$
import base64, sax_utils, resource_set, lxml.etree
xmlns="http://www.apnic.net/specs/rescerts/up-down/"
nsmap = { None : xmlns }
class base_elt(object):
"""
Generic PDU object, just provides some default methods.
"""
def startElement(self, stack, name, attrs):
pass
def endElement(self, stack, name, text):
stack.pop()
def make_elt(self, name, *attrs):
elt = lxml.etree.Element("{%s}%s" % (xmlns, name), nsmap=nsmap)
for key in attrs:
val = getattr(self, key, None)
if val is not None:
elt.set(key, str(val))
return elt
def make_b64elt(self, elt, name):
lxml.etree.SubElement(elt, "{%s}%s" % (xmlns, name), nsmap=nsmap).text = base64.b64encode(getattr(self, name))
class certificate_elt(base_elt):
"""
Up-Down protocol representation of an issued certificate.
"""
def startElement(self, stack, name, attrs):
assert name == "certificate", "Unexpected name %s, stack %s" % (name, stack)
self.cert_url = attrs["cert_url"]
self.req_resource_set_as = resource_set.resource_set_as(attrs["req_resource_set_as"])
self.req_resource_set_ipv4 = resource_set.resource_set_ipv4(attrs["req_resource_set_ipv4"])
self.req_resource_set_ipv6 = resource_set.resource_set_ipv6(attrs["req_resource_set_ipv6"])
def endElement(self, stack, name, text):
assert name == "certificate"
self.cert = base64.b64decode(text)
stack.pop()
def toXML(self):
elt = self.make_elt("certificate", "cert_url", "req_resource_set_as", "req_resource_set_ipv4", "req_resource_set_ipv6")
elt.text = base64.b64encode(self.cert)
return elt
class class_elt(base_elt):
"""
Up-Down protocol representation of a resource class.
"""
def __init__(self):
self.certs = []
def startElement(self, stack, name, attrs):
if name == "certificate":
cert = certificate_elt()
self.certs.append(cert)
stack.append(cert)
cert.startElement(stack, name, attrs)
elif name != "issuer":
assert name == "class", "Unexpected name %s, stack %s" % (name, stack)
self.class_name = attrs["class_name"]
self.cert_url = attrs["cert_url"]
self.suggested_sia_head = attrs.get("suggested_sia_head")
self.resource_set_as = resource_set.resource_set_as(attrs["resource_set_as"])
self.resource_set_ipv4 = resource_set.resource_set_ipv4(attrs["resource_set_ipv4"])
self.resource_set_ipv6 = resource_set.resource_set_ipv6(attrs["resource_set_ipv6"])
def endElement(self, stack, name, text):
if name == "issuer":
self.issuer = base64.b64decode(text)
else:
assert name == "class", "Unexpected name %s, stack %s" % (name, stack)
stack.pop()
def toXML(self):
elt = self.make_elt("class", "class_name", "cert_url", "resource_set_as", "resource_set_ipv4", "resource_set_ipv6", "suggested_sia_head")
elt.extend([i.toXML() for i in self.certs])
self.make_b64elt(elt, "issuer")
return elt
class list_pdu(base_elt):
"""
Up-Down protocol "list" PDU.
"""
def toXML(self):
return []
class list_response_pdu(base_elt):
"""
Up-Down protocol "list_response" PDU.
"""
def __init__(self):
self.classes = []
def startElement(self, stack, name, attrs):
assert name == "class", "Unexpected name %s, stack %s" % (name, stack)
klass = class_elt()
self.classes.append(klass)
stack.append(klass)
klass.startElement(stack, name, attrs)
def toXML(self):
return [i.toXML() for i in self.classes]
class issue_pdu(base_elt):
"""
Up-Down protocol "issue" PDU.
"""
def startElement(self, stack, name, attrs):
assert name == "request", "Unexpected name %s, stack %s" % (name, stack)
self.class_name = attrs["class_name"]
self.req_resource_set_as = resource_set.resource_set_as(attrs.get("req_resource_set_as"))
self.req_resource_set_ipv4 = resource_set.resource_set_ipv4(attrs.get("req_resource_set_ipv4"))
self.req_resource_set_ipv6 = resource_set.resource_set_ipv6(attrs.get("req_resource_set_ipv6"))
def endElement(self, stack, name, text):
assert name == "request", "Unexpected name %s, stack %s" % (name, stack)
self.pkcs10 = base64.b64decode(text)
stack.pop()
def toXML(self):
elt = self.make_elt("request", "class_name", "req_resource_set_as", "req_resource_set_ipv4", "req_resource_set_ipv6")
elt.text = base64.b64encode(self.pkcs10)
return [elt]
class issue_response_pdu(list_response_pdu):
"""
Up-Down protocol "issue_response" PDU.
"""
def toXML(self):
assert len(self.classes) == 1
return list_response_pdu.toXML(self)
class revoke_pdu(base_elt):
"""
Up-Down protocol "revoke" PDU.
"""
def startElement(self, stack, name, attrs):
self.class_name = attrs["class_name"]
self.ski = attrs["ski"]
def toXML(self):
return [self.make_elt("key", "class_name", "ski")]
class revoke_response_pdu(revoke_pdu):
"""
Up-Down protocol "revoke_response" PDU.
"""
pass
class error_response_pdu(base_elt):
"""
Up-Down protocol "error_response" PDU.
"""
def toXML(self):
elt = self.make_elt("status")
elt.text = str(self.status)
return [elt]
def endElement(self, stack, name, text):
if name == "status":
self.status = int(text)
elif name == "last_message_processed":
self.last_message_processed = text
elif name == "description":
self.description = text
else:
assert name == "message", "Unexpected name %s, stack %s" % (name, stack)
stack.pop()
stack[-1].endElement(stack, name, text)
class message_pdu(base_elt):
"""
Up-Down protocol message wrapper.
"""
version = 1
def toXML(self):
elt = self.make_elt("message", "version", "sender", "recipient", "type")
elt.extend(self.payload.toXML())
return elt
def startElement(self, stack, name, attrs):
assert name == "message", "Unexpected name %s, stack %s" % (name, stack)
assert self.version == int(attrs["version"])
self.sender = attrs["sender"]
self.recipient = attrs["recipient"]
self.type = attrs["type"]
self.payload = {
"list" : list_pdu,
"list_response" : list_response_pdu,
"issue" : issue_pdu,
"issue_response" : issue_response_pdu,
"revoke" : revoke_pdu,
"revoke_response" : revoke_response_pdu,
"error_response" : error_response_pdu
}[attrs["type"]]()
stack.append(self.payload)
def __str__(self):
lxml.etree.tostring(self.toXML(), pretty_print=True, encoding="UTF-8")
class sax_handler(sax_utils.handler):
"""
SAX handler for Up-Down protocol.
"""
def create_top_level(self, name, attrs):
return message_pdu()
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