mirror of https://github.com/morpheus65535/bazarr
74 lines
2.6 KiB
Python
74 lines
2.6 KiB
Python
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# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc.
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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import struct
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import dns.exception
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import dns.rdata
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import dns.tokenizer
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class CAA(dns.rdata.Rdata):
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"""CAA (Certification Authority Authorization) record
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@ivar flags: the flags
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@type flags: int
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@ivar tag: the tag
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@type tag: string
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@ivar value: the value
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@type value: string
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@see: RFC 6844"""
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__slots__ = ['flags', 'tag', 'value']
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def __init__(self, rdclass, rdtype, flags, tag, value):
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super(CAA, self).__init__(rdclass, rdtype)
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self.flags = flags
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self.tag = tag
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self.value = value
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def to_text(self, origin=None, relativize=True, **kw):
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return '%u %s "%s"' % (self.flags,
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dns.rdata._escapify(self.tag),
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dns.rdata._escapify(self.value))
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@classmethod
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def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True):
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flags = tok.get_uint8()
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tag = tok.get_string().encode()
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if len(tag) > 255:
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raise dns.exception.SyntaxError("tag too long")
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if not tag.isalnum():
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raise dns.exception.SyntaxError("tag is not alphanumeric")
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value = tok.get_string().encode()
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return cls(rdclass, rdtype, flags, tag, value)
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def to_wire(self, file, compress=None, origin=None):
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file.write(struct.pack('!B', self.flags))
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l = len(self.tag)
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assert l < 256
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file.write(struct.pack('!B', l))
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file.write(self.tag)
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file.write(self.value)
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@classmethod
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def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None):
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(flags, l) = struct.unpack('!BB', wire[current: current + 2])
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current += 2
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tag = wire[current: current + l]
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value = wire[current + l:current + rdlen - 2]
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return cls(rdclass, rdtype, flags, tag, value)
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