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# SPDX-License-Identifier: AGPL-3.0-or-later
"""Simple implementation to store TrackerPatterns data in a SQL database."""
from __future__ import annotations
import typing
__all__ = ["TrackerPatternsDB"]
import re
import pathlib
from collections.abc import Iterator
from urllib.parse import urlparse, urlunparse, parse_qsl, urlencode
import httpx
from searx.data.core import get_cache, log
RuleType = tuple[str, list[str], list[str]]
class TrackerPatternsDB:
# pylint: disable=missing-class-docstring
ctx_name = "data_tracker_patterns"
json_file = pathlib.Path(__file__).parent / "tracker_patterns.json"
CLEAR_LIST_URL = [
# ClearURL rule lists, the first one that responds HTTP 200 is used
"https://rules1.clearurls.xyz/data.minify.json",
"https://rules2.clearurls.xyz/data.minify.json",
"https://raw.githubusercontent.com/ClearURLs/Rules/refs/heads/master/data.min.json",
]
class Fields:
# pylint: disable=too-few-public-methods, invalid-name
url_regexp: typing.Final = 0 # URL (regular expression) match condition of the link
url_ignore: typing.Final = 1 # URL (regular expression) to ignore
del_args: typing.Final = 2 # list of URL arguments (regular expression) to delete
def __init__(self):
self.cache = get_cache()
def init(self):
if self.cache.properties("tracker_patterns loaded") != "OK":
self.load()
self.cache.properties.set("tracker_patterns loaded", "OK")
# F I X M E:
# do we need a maintenance .. rember: database is stored
# in /tmp and will be rebuild during the reboot anyway
def load(self):
log.debug("init searx.data.TRACKER_PATTERNS")
for rule in self.iter_clear_list():
self.add(rule)
def add(self, rule: RuleType):
self.cache.set(
key=rule[self.Fields.url_regexp],
value=(
rule[self.Fields.url_ignore],
rule[self.Fields.del_args],
),
ctx=self.ctx_name,
expire=None,
)
def rules(self) -> Iterator[RuleType]:
self.init()
for key, value in self.cache.pairs(ctx=self.ctx_name):
yield key, value[0], value[1]
def iter_clear_list(self) -> Iterator[RuleType]:
resp = None
for url in self.CLEAR_LIST_URL:
resp = httpx.get(url, timeout=3)
if resp.status_code == 200:
break
log.warning(f"TRACKER_PATTERNS: ClearURL ignore HTTP {resp.status_code} {url}")
if resp is None:
log.error("TRACKER_PATTERNS: failed fetching ClearURL rule lists")
return
for rule in resp.json()["providers"].values():
yield (
rule["urlPattern"].replace("\\\\", "\\"), # fix javascript regex syntax
[exc.replace("\\\\", "\\") for exc in rule.get("exceptions", [])],
rule.get("rules", []),
)
def clean_url(self, url: str) -> bool | str:
"""The URL arguments are normalized and cleaned of tracker parameters.
Returns bool ``True`` to use URL unchanged (``False`` to ignore URL).
If URL should be modified, the returned string is the new URL to use.
"""
new_url = url
parsed_new_url = urlparse(url=new_url)
for rule in self.rules():
if not re.match(rule[self.Fields.url_regexp], new_url):
# no match / ignore pattern
continue
do_ignore = False
for pattern in rule[self.Fields.url_ignore]:
if re.match(pattern, new_url):
do_ignore = True
break
if do_ignore:
# pattern is in the list of exceptions / ignore pattern
# HINT:
# we can't break the outer pattern loop since we have
# overlapping urlPattern like ".*"
continue
# remove tracker arguments from the url-query part
query_args: list[tuple[str, str]] = list(parse_qsl(parsed_new_url.query))
for name, val in query_args.copy():
# remove URL arguments
for pattern in rule[self.Fields.del_args]:
if re.match(pattern, name):
log.debug("TRACKER_PATTERNS: %s remove tracker arg: %s='%s'", parsed_new_url.netloc, name, val)
query_args.remove((name, val))
parsed_new_url = parsed_new_url._replace(query=urlencode(query_args))
new_url = urlunparse(parsed_new_url)
if new_url != url:
return new_url
return True
if __name__ == "__main__":
db = TrackerPatternsDB()
for r in db.rules():
print(r)
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