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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 of this
# code in a proprietary program, I am not going to enforce this in
# court.
"""
.....
"""
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
script_csp_directives = ('script-src', 'script-src-elem', 'script-src-attr')
class BlockPolicy(base.Policy):
"""...."""
_process_response: t.ClassVar[bool] = True
priority: t.ClassVar[base.PolicyPriority] = base.PolicyPriority._TWO
def _csp_to_clear(self, http_info: http_messages.FullHTTPInfo) \
-> t.Sequence[str]:
return script_csp_directives
def _csp_to_add(self, http_info: http_messages.FullHTTPInfo) \
-> t.Mapping[str, t.Sequence[str]]:
return dict((d, ["'none'"]) for d in script_csp_directives)
@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 not 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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