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# SPDX-License-Identifier: GPL-3.0-or-later
# Policies for blocking and allowing JS in pages fetched with HTTP.
#
# This file is part of Hydrilla&Haketilo.
#
# Copyright (C) 2022 Wojtek Kosior
#
# This program 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.
#
# 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 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 <https://www.gnu.org/licenses/>.
#
#
# I, Wojtek Kosior, thereby promise not to sue for violation of this
# file's license. Although I request that you do not make use this code
# in a proprietary program, I am not going to enforce this in court.
"""
.....
"""
# Enable using with Python 3.7.
from __future__ import annotations
import dataclasses as dc
import typing as t
from ...url_patterns import ParsedPattern
from .. import csp
from .. import state
from ..import http_messages
from . import base
class AllowPolicy(base.Policy):
"""...."""
priority: t.ClassVar[base.PolicyPriority] = base.PolicyPriority._TWO
class BlockPolicy(base.Policy):
"""...."""
process_response: t.ClassVar[bool] = True
priority: t.ClassVar[base.PolicyPriority] = base.PolicyPriority._TWO
def _modify_headers(self, response_info: http_messages.ResponseInfo) \
-> t.Iterable[tuple[bytes, bytes]]:
"""...."""
csp_policies = csp.extract(response_info.headers)
for header_name, header_value in response_info.headers.items():
if header_name.lower() not in csp.header_names_and_dispositions:
yield header_name.encode(), header_value.encode()
for policy in csp_policies:
if policy.disposition != 'enforce':
continue
directives = policy.directives.mutate()
directives.pop('report-to', None)
directives.pop('report-uri', None)
policy = dc.replace(policy, directives=directives.finish())
yield policy.header_name.encode(), policy.serialize().encode()
extra_csp = ';'.join((
"script-src 'none'",
"script-src-elem 'none'",
"script-src-attr 'none'"
))
yield b'Content-Security-Policy', extra_csp.encode()
def consume_response(self, response_info: http_messages.ResponseInfo) \
-> http_messages.ProducedResponse:
"""...."""
new_response = response_info.make_produced_response()
new_headers = self._modify_headers(response_info)
return dc.replace(new_response, headers=new_headers)
@dc.dataclass(frozen=True)
class RuleAllowPolicy(AllowPolicy):
"""...."""
pattern: ParsedPattern
@dc.dataclass(frozen=True)
class RuleBlockPolicy(BlockPolicy):
"""...."""
pattern: ParsedPattern
@dc.dataclass(frozen=True, unsafe_hash=True) # type: ignore[misc]
class RulePolicyFactory(base.PolicyFactory):
"""...."""
pattern: ParsedPattern
def __lt__(self, other: base.PolicyFactory) -> bool:
"""...."""
if type(other) is type(self):
return super().__lt__(other)
assert isinstance(other, RulePolicyFactory)
return self.pattern < other.pattern
@dc.dataclass(frozen=True, unsafe_hash=True) # type: ignore[misc]
class RuleBlockPolicyFactory(RulePolicyFactory):
"""...."""
def make_policy(self, haketilo_state: state.HaketiloState) \
-> RuleBlockPolicy:
"""...."""
return RuleBlockPolicy(self.pattern)
@dc.dataclass(frozen=True, unsafe_hash=True) # type: ignore[misc]
class RuleAllowPolicyFactory(RulePolicyFactory):
"""...."""
def make_policy(self, haketilo_state: state.HaketiloState) \
-> RuleAllowPolicy:
"""...."""
return RuleAllowPolicy(self.pattern)
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