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# SPDX-License-Identifier: GPL-3.0-or-later
# Haketilo proxy data and configuration (RuleRef and RuleStore subtypes).
#
# 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.
"""
This module provides an interface to interact with script allowing/blocking
rules configured inside Haketilo.
"""
# Enable using with Python 3.7.
from __future__ import annotations
import sqlite3
import typing as t
import dataclasses as dc
from ... import url_patterns
from .. import state as st
from . import base
def ensure_rule_not_deleted(cursor: sqlite3.Cursor, rule_id: str) -> None:
cursor.execute('SELECT COUNT(*) from rules where rule_id = ?;', (rule_id,))
(rule_present,), = cursor.fetchall()
if not rule_present:
raise st.MissingItemError()
def sanitize_rule_pattern(pattern: str) -> str:
pattern = pattern.strip()
try:
assert pattern
return url_patterns.normalize_pattern(pattern)
except:
raise st.RulePatternInvalid()
@dc.dataclass(frozen=True, unsafe_hash=True)
class ConcreteRuleRef(st.RuleRef):
state: base.HaketiloStateWithFields = dc.field(hash=False, compare=False)
def remove(self) -> None:
with self.state.cursor(transaction=True) as cursor:
ensure_rule_not_deleted(cursor, self.id)
cursor.execute('DELETE FROM rules WHERE rule_id = ?;', self.id)
self.state.rebuild_structures(payloads=False)
def update(
self,
*,
pattern: t.Optional[str] = None,
allow: t.Optional[bool] = None
) -> None:
if pattern is not None:
pattern = sanitize_rule_pattern(pattern)
if pattern is None and allow is None:
return
with self.state.cursor(transaction=True) as cursor:
ensure_rule_not_deleted(cursor, self.id)
if allow is not None:
cursor.execute(
'UPDATE rules SET allow_scripts = ? WHERE rule_id = ?;',
(allow, self.id)
)
if pattern is not None:
cursor.execute(
'DELETE FROM rules WHERE pattern = ? AND rule_id != ?;',
(pattern, self.id)
)
cursor.execute(
'UPDATE rules SET pattern = ? WHERE rule_id = ?;',
(pattern, self.id)
)
self.state.rebuild_structures(payloads=False)
def get_display_info(self) -> st.RuleDisplayInfo:
with self.state.cursor() as cursor:
cursor.execute(
'SELECT pattern, allow_scripts FROM rules WHERE rule_id = ?;',
(self.id,)
)
rows = cursor.fetchall()
if rows == []:
raise st.MissingItemError()
(pattern, allow), = rows
return st.RuleDisplayInfo(self, pattern, allow)
@dc.dataclass(frozen=True)
class ConcreteRuleStore(st.RuleStore):
state: base.HaketiloStateWithFields
def get(self, id: str) -> st.RuleRef:
return ConcreteRuleRef(str(int(id)), self.state)
def add(self, pattern: str, allow: bool) -> st.RuleRef:
pattern = sanitize_rule_pattern(pattern)
with self.state.cursor(transaction=True) as cursor:
cursor.execute(
'''
INSERT INTO rules(pattern, allow_scripts)
VALUES (?, ?)
ON CONFLICT (pattern)
DO UPDATE SET allow_scripts = excluded.allow_scripts;
''',
(pattern, allow)
)
cursor.execute(
'SELECT rule_id FROM rules WHERE pattern = ?;',
(pattern,)
)
(rule_id,), = cursor.fetchall()
return ConcreteRuleRef(str(rule_id), self.state)
def get_display_infos(self, allow: t.Optional[bool] = None) \
-> t.Sequence[st.RuleDisplayInfo]:
with self.state.cursor() as cursor:
cursor.execute(
'''
SELECT
rule_id, pattern, allow_scripts
FROM
rules
WHERE
COALESCE(allow_scripts = ?, TRUE)
ORDER BY
pattern;
''',
(allow,)
)
rows = cursor.fetchall()
result = []
for rule_id, pattern, allow_scripts in rows:
ref = ConcreteRuleRef(str(rule_id), self.state)
result.append(st.RuleDisplayInfo(ref, pattern, allow_scripts))
return result
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