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편집 파일: GPOS.py

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# Copyright (C) 2003-2007, 2009-2011 Nominum, 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.rdata
import dns.tokenizer

def _validate_float_string(what):
    if len(what) == 0:
        raise dns.exception.FormError
    if what[0] == b"-"[0] or what[0] == b"+"[0]:
        what = what[1:]
    if what.isdigit():
        return
    try:
        (left, right) = what.split(b".")
    except ValueError:
        raise dns.exception.FormError
    if left == b"" and right == b"":
        raise dns.exception.FormError
    if not left == b"" and not left.decode().isdigit():
        raise dns.exception.FormError
    if not right == b"" and not right.decode().isdigit():
        raise dns.exception.FormError

@dns.immutable.immutable
class GPOS(dns.rdata.Rdata):
    """GPOS record"""

# see: RFC 1712

__slots__ = ["latitude", "longitude", "altitude"]

def __init__(self, rdclass, rdtype, latitude, longitude, altitude):
        super().__init__(rdclass, rdtype)
        if isinstance(latitude, float) or isinstance(latitude, int):
            latitude = str(latitude)
        if isinstance(longitude, float) or isinstance(longitude, int):
            longitude = str(longitude)
        if isinstance(altitude, float) or isinstance(altitude, int):
            altitude = str(altitude)
        latitude = self._as_bytes(latitude, True, 255)
        longitude = self._as_bytes(longitude, True, 255)
        altitude = self._as_bytes(altitude, True, 255)
        _validate_float_string(latitude)
        _validate_float_string(longitude)
        _validate_float_string(altitude)
        self.latitude = latitude
        self.longitude = longitude
        self.altitude = altitude
        flat = self.float_latitude
        if flat < -90.0 or flat > 90.0:
            raise dns.exception.FormError("bad latitude")
        flong = self.float_longitude
        if flong < -180.0 or flong > 180.0:
            raise dns.exception.FormError("bad longitude")

def to_text(self, origin=None, relativize=True, **kw):
        return "{} {} {}".format(
            self.latitude.decode(), self.longitude.decode(), self.altitude.decode()
        )

@classmethod
    def from_text(
        cls, rdclass, rdtype, tok, origin=None, relativize=True, relativize_to=None
    ):
        latitude = tok.get_string()
        longitude = tok.get_string()
        altitude = tok.get_string()
        return cls(rdclass, rdtype, latitude, longitude, altitude)

def _to_wire(self, file, compress=None, origin=None, canonicalize=False):
        l = len(self.latitude)
        assert l < 256
        file.write(struct.pack("!B", l))
        file.write(self.latitude)
        l = len(self.longitude)
        assert l < 256
        file.write(struct.pack("!B", l))
        file.write(self.longitude)
        l = len(self.altitude)
        assert l < 256
        file.write(struct.pack("!B", l))
        file.write(self.altitude)

@classmethod
    def from_wire_parser(cls, rdclass, rdtype, parser, origin=None):
        latitude = parser.get_counted_bytes()
        longitude = parser.get_counted_bytes()
        altitude = parser.get_counted_bytes()
        return cls(rdclass, rdtype, latitude, longitude, altitude)

@property
    def float_latitude(self):
        "latitude as a floating point value"
        return float(self.latitude)

@property
    def float_longitude(self):
        "longitude as a floating point value"
        return float(self.longitude)

@property
    def float_altitude(self):
        "altitude as a floating point value"
        return float(self.altitude)

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편집 파일: GPOS.py

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