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# Copyright 2014-2022 Vincent Texier <vit@free.fr>
#
# DuniterPy is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# DuniterPy is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import re
import attr
from ...constants import (
BLOCK_ID_REGEX,
PUBKEY_REGEX,
SIGNATURE_REGEX,
WS2P_HEAD_REGEX,
WS2P_PRIVATE_PREFIX_REGEX,
WS2P_PUBLIC_PREFIX_REGEX,
WS2PID_REGEX,
)
from ...key import VerifyingKey
from ..block_id import BlockID
from ..document import MalformedDocumentError
@attr.s()
class API:
private = attr.ib(type=str)
public = attr.ib(type=str)
re_inline = re.compile(
f"WS2P({WS2P_PRIVATE_PREFIX_REGEX})?({WS2P_PUBLIC_PREFIX_REGEX})?"
)
@classmethod
def from_inline(cls, inline: str):
data = API.re_inline.match(inline)
if data is None:
raise MalformedDocumentError("WS2P API Document")
private = "" if data.group(1) is None else data.group(1)
public = "" if data.group(2) is None else data.group(2)
return cls(private, public)
def __str__(self) -> str:
return f"WS2P{self.private}{self.public}"
@attr.s()
class Head:
version = attr.ib(type=int)
re_inline = re.compile(WS2P_HEAD_REGEX)
@classmethod
def from_inline(cls, inline: str, signature: str):
try:
data = Head.re_inline.match(inline)
if data is None:
raise MalformedDocumentError("Head")
head = data.group(0).split(":")
version = int(head[1]) if len(head) == 2 else 0
return cls(version)
except AttributeError:
raise MalformedDocumentError("Head") from AttributeError
def __str__(self) -> str:
return "HEAD" if self.version == 0 else f"HEAD:{str(self.version)}"
@attr.s()
class HeadV0(Head):
signature = attr.ib(type=str)
api = attr.ib(type=API)
head = attr.ib(type=Head)
pubkey = attr.ib(type=str)
block_id = attr.ib(type=BlockID)
re_inline = re.compile(
f"^(WS2P(?:{WS2P_PRIVATE_PREFIX_REGEX})?(?:{WS2P_PUBLIC_PREFIX_REGEX})?):\
({WS2P_HEAD_REGEX}):({PUBKEY_REGEX}):({BLOCK_ID_REGEX})(?::)?(.*)"
)
re_signature = re.compile(SIGNATURE_REGEX)
@classmethod
def from_inline(cls, inline: str, signature: str):
try:
data = HeadV0.re_inline.match(inline)
if data is None:
raise MalformedDocumentError("HeadV0")
api = API.from_inline(data.group(1))
head = Head.from_inline(data.group(2), "")
pubkey = data.group(3)
block_id = BlockID.from_str(data.group(4))
offload = data.group(5)
return cls(head.version, signature, api, head, pubkey, block_id), offload
except AttributeError:
raise MalformedDocumentError("HeadV0") from AttributeError
def inline(self) -> str:
values = (
str(v)
for v in attr.astuple(
self,
recurse=False,
filter=attr.filters.exclude(
attr.fields(HeadV0).version,
attr.fields(HeadV0).signature,
attr.fields(HeadV0).api,
),
)
)
return f'{str(self.api)}:{":".join(values)}'
def check_signature(self, pubkey: str) -> bool:
"""
Check if Head signature is from head pubkey
:param pubkey: Pubkey to check signature upon
:return:
"""
verifying_key = VerifyingKey(pubkey)
return verifying_key.check_signature(self.inline(), self.signature)
@attr.s()
class HeadV1(HeadV0):
ws2pid = attr.ib(type=str)
software = attr.ib(type=str)
software_version = attr.ib(type=str)
pow_prefix = attr.ib(type=int)
re_inline = re.compile(
"({ws2pid}):({software}):({software_version}):({pow_prefix})(?::)?(.*)".format(
ws2pid=WS2PID_REGEX,
software="[A-Za-z-_]+",
software_version="[0-9]+[.][0-9]+[.][0-9]+[-\\w]*",
pow_prefix="[0-9]+",
)
)
@classmethod
def from_inline(cls, inline: str, signature: str):
try:
v0, offload = HeadV0.from_inline(inline, signature)
data = HeadV1.re_inline.match(offload)
if data is None:
raise MalformedDocumentError("HeadV1")
ws2pid = data.group(1)
software = data.group(2)
software_version = data.group(3)
pow_prefix = int(data.group(4))
offload = data.group(5)
return (
cls(
v0.version,
v0.signature,
v0.api,
v0.head,
v0.pubkey,
v0.block_id,
ws2pid,
software,
software_version,
pow_prefix,
),
offload,
)
except AttributeError:
raise MalformedDocumentError("HeadV1") from AttributeError
@attr.s
class HeadV2(HeadV1):
free_member_room = attr.ib(type=int)
free_mirror_room = attr.ib(type=int)
re_inline = re.compile(
"({free_member_room}):({free_mirror_room})(?::)?(.*)".format(
free_member_room="[0-9]+", free_mirror_room="[0-9]+"
)
)
@classmethod
def from_inline(cls, inline: str, signature: str):
try:
v1, offload = HeadV1.from_inline(inline, signature)
data = HeadV2.re_inline.match(offload)
if data is None:
raise MalformedDocumentError("HeadV2")
free_member_room = int(data.group(1))
free_mirror_room = int(data.group(2))
return (
cls(
v1.version,
v1.signature,
v1.api,
v1.head,
v1.pubkey,
v1.block_id,
v1.ws2pid,
v1.software,
v1.software_version,
v1.pow_prefix,
free_member_room,
free_mirror_room,
),
"",
)
except AttributeError:
raise MalformedDocumentError("HeadV2") from AttributeError
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