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########################################################################
# File name: caps115.py
# This file is part of: aioxmpp
#
# LICENSE
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program. If not, see
# <http://www.gnu.org/licenses/>.
#
########################################################################
import base64
import collections
import hashlib
import pathlib
import urllib.parse
from xml.sax.saxutils import escape
from .common import AbstractKey, AbstractImplementation
from . import xso as caps_xso
def build_identities_string(identities):
identities = [
b"/".join([
escape(identity.category).encode("utf-8"),
escape(identity.type_).encode("utf-8"),
escape(str(identity.lang or "")).encode("utf-8"),
escape(identity.name or "").encode("utf-8"),
])
for identity in identities
]
if len(set(identities)) != len(identities):
raise ValueError("duplicate identity")
identities.sort()
identities.append(b"")
return b"<".join(identities)
def build_features_string(features):
features = list(escape(feature).encode("utf-8") for feature in features)
if len(set(features)) != len(features):
raise ValueError("duplicate feature")
features.sort()
features.append(b"")
return b"<".join(features)
def build_forms_string(forms):
types = set()
forms_list = []
for form in forms:
try:
form_types = set(
value
for field in form.fields.filter(attrs={"var": "FORM_TYPE"})
for value in field.values
)
except KeyError:
continue
if len(form_types) > 1:
raise ValueError("form with multiple types")
elif not form_types:
continue
type_ = escape(next(iter(form_types))).encode("utf-8")
if type_ in types:
raise ValueError("multiple forms of type {!r}".format(type_))
types.add(type_)
forms_list.append((type_, form))
forms_list.sort()
parts = []
for type_, form in forms_list:
parts.append(type_)
field_list = sorted(
(
(escape(field.var).encode("utf-8"), field.values)
for field in form.fields
if field.var != "FORM_TYPE"
),
key=lambda x: x[0]
)
for var, values in field_list:
parts.append(var)
parts.extend(sorted(
escape(value).encode("utf-8") for value in values
))
parts.append(b"")
return b"<".join(parts)
def hash_query(query, algo):
hashimpl = hashlib.new(algo)
hashimpl.update(
build_identities_string(query.identities)
)
hashimpl.update(
build_features_string(query.features)
)
hashimpl.update(
build_forms_string(query.exts)
)
return base64.b64encode(hashimpl.digest()).decode("ascii")
Key = collections.namedtuple("Key", ["algo", "node"])
class Key(Key, AbstractKey):
@property
def path(self):
quoted = urllib.parse.quote(self.node, safe="")
return (pathlib.Path("hashes") /
"{}_{}.xml".format(self.algo, quoted))
@property
def ver(self):
return self.node.rsplit("#", 1)[1]
def verify(self, query_response):
digest_b64 = hash_query(query_response, self.algo.replace("-", ""))
return self.ver == digest_b64
class Implementation(AbstractImplementation):
def __init__(self, node, **kwargs):
super().__init__(**kwargs)
self.__node = node
def extract_keys(self, obj):
caps = obj.xep0115_caps
if caps is None or caps.hash_ is None:
return
yield Key(caps.hash_, "{}#{}".format(caps.node, caps.ver))
def put_keys(self, keys, presence):
key, = keys
presence.xep0115_caps = caps_xso.Caps115(
self.__node,
key.ver,
key.algo,
)
def calculate_keys(self, query_response):
yield Key(
"sha-1",
"{}#{}".format(
self.__node,
hash_query(query_response, "sha1"),
)
)
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