# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc.
# Copyright (C) 2015 Red Hat, Inc.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
import struct
import dns.exception
import dns.rdata
import dns.name
from dns._compat import text_type
class URI(dns.rdata.Rdata):
"""URI record
@ivar priority: the priority
@type priority: int
@ivar weight: the weight
@type weight: int
@ivar target: the target host
@type target: dns.name.Name object
@see: draft-faltstrom-uri-13"""
__slots__ = ['priority', 'weight', 'target']
def __init__(self, rdclass, rdtype, priority, weight, target):
super(URI, self).__init__(rdclass, rdtype)
self.priority = priority
self.weight = weight
if len(target) < 1:
raise dns.exception.SyntaxError("URI target cannot be empty")
if isinstance(target, text_type):
self.target = target.encode()
else:
self.target = target
def to_text(self, origin=None, relativize=True, **kw):
return '%d %d "%s"' % (self.priority, self.weight,
self.target.decode())
@classmethod
def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
priority = tok.get_uint16()
weight = tok.get_uint16()
target = tok.get().unescape()
if not (target.is_quoted_string() or target.is_identifier()):
raise dns.exception.SyntaxError("URI target must be a string")
tok.get_eol()
return cls(rdclass, rdtype, priority, weight, target.value)
def to_wire(self, file, compress=None, origin=None):
two_ints = struct.pack("!HH", self.priority, self.weight)
file.write(two_ints)
file.write(self.target)
@classmethod
def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
if rdlen < 5:
raise dns.exception.FormError('URI RR is shorter than 5 octets')
(priority, weight) = struct.unpack('!HH', wire[current: current + 4])
current += 4
rdlen -= 4
target = wire[current: current + rdlen]
current += rdlen
return cls(rdclass, rdtype, priority, weight, target)
