# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
# 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.immutable
import dns.name
import dns.rdata
import dns.rdtypes.util
[docs]
@dns.immutable.immutable
class URI(dns.rdata.Rdata):
"""URI record"""
# see RFC 7553
__slots__ = ["priority", "weight", "target"]
def __init__(self, rdclass, rdtype, priority, weight, target):
super().__init__(rdclass, rdtype)
self.priority = self._as_uint16(priority)
self.weight = self._as_uint16(weight)
self.target = self._as_bytes(target, True)
if len(self.target) == 0:
raise dns.exception.SyntaxError("URI target cannot be empty")
[docs]
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, relativize_to=None
):
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")
return cls(rdclass, rdtype, priority, weight, target.value)
def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
two_ints = struct.pack("!HH", self.priority, self.weight)
file.write(two_ints)
file.write(self.target)
@classmethod
def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
(priority, weight) = parser.get_struct("!HH")
target = parser.get_remaining()
if len(target) == 0:
raise dns.exception.FormError("URI target may not be empty")
return cls(rdclass, rdtype, priority, weight, target)
def _processing_priority(self):
return self.priority
def _processing_weight(self):
return self.weight
@classmethod
def _processing_order(cls, iterable):
return dns.rdtypes.util.weighted_processing_order(iterable)