MatrixSynapse/synapse/push/push_rule_evaluator.py

241 lines
7.7 KiB
Python
Raw Normal View History

2016-01-07 05:26:29 +01:00
# Copyright 2015, 2016 OpenMarket Ltd
# Copyright 2017 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import re
2020-10-16 16:56:39 +02:00
from typing import Any, Dict, List, Optional, Pattern, Tuple, Union
from matrix_common.regex import glob_to_regex, to_word_pattern
from synapse.events import EventBase
from synapse.types import JsonDict, UserID
from synapse.util.caches.lrucache import LruCache
2016-01-18 15:09:47 +01:00
logger = logging.getLogger(__name__)
2019-06-20 11:32:02 +02:00
GLOB_REGEX = re.compile(r"\\\[(\\\!|)(.*)\\\]")
IS_GLOB = re.compile(r"[\?\*\[\]]")
2016-01-18 15:09:47 +01:00
INEQUALITY_EXPR = re.compile("^([=<>]*)([0-9]*)$")
def _room_member_count(
ev: EventBase, condition: Dict[str, Any], room_member_count: int
) -> bool:
return _test_ineq_condition(condition, room_member_count)
2017-10-05 14:08:02 +02:00
def _sender_notification_permission(
ev: EventBase,
condition: Dict[str, Any],
sender_power_level: int,
power_levels: Dict[str, Union[int, Dict[str, int]]],
) -> bool:
2019-06-20 11:32:02 +02:00
notif_level_key = condition.get("key")
if notif_level_key is None:
return False
2019-06-20 11:32:02 +02:00
notif_levels = power_levels.get("notifications", {})
assert isinstance(notif_levels, dict)
room_notif_level = notif_levels.get(notif_level_key, 50)
2017-10-10 16:53:34 +02:00
return sender_power_level >= room_notif_level
2017-10-05 14:08:02 +02:00
def _test_ineq_condition(condition: Dict[str, Any], number: int) -> bool:
2019-06-20 11:32:02 +02:00
if "is" not in condition:
2016-01-18 15:09:47 +01:00
return False
2019-06-20 11:32:02 +02:00
m = INEQUALITY_EXPR.match(condition["is"])
2016-01-18 15:09:47 +01:00
if not m:
return False
ineq = m.group(1)
rhs = m.group(2)
if not rhs.isdigit():
return False
rhs_int = int(rhs)
2016-01-18 15:09:47 +01:00
2019-06-20 11:32:02 +02:00
if ineq == "" or ineq == "==":
return number == rhs_int
2019-06-20 11:32:02 +02:00
elif ineq == "<":
return number < rhs_int
2019-06-20 11:32:02 +02:00
elif ineq == ">":
return number > rhs_int
2019-06-20 11:32:02 +02:00
elif ineq == ">=":
return number >= rhs_int
2019-06-20 11:32:02 +02:00
elif ineq == "<=":
return number <= rhs_int
2016-01-18 15:09:47 +01:00
else:
return False
2017-10-05 14:08:02 +02:00
def tweaks_for_actions(actions: List[Union[str, Dict]]) -> Dict[str, Any]:
"""
Converts a list of actions into a `tweaks` dict (which can then be passed to
the push gateway).
This function ignores all actions other than `set_tweak` actions, and treats
absent `value`s as `True`, which agrees with the only spec-defined treatment
of absent `value`s (namely, for `highlight` tweaks).
Args:
actions: list of actions
e.g. [
{"set_tweak": "a", "value": "AAA"},
{"set_tweak": "b", "value": "BBB"},
{"set_tweak": "highlight"},
"notify"
]
Returns:
dictionary of tweaks for those actions
e.g. {"a": "AAA", "b": "BBB", "highlight": True}
"""
tweaks = {}
for a in actions:
if not isinstance(a, dict):
continue
if "set_tweak" in a:
# value is allowed to be absent in which case the value assumed
# should be True.
tweaks[a["set_tweak"]] = a.get("value", True)
return tweaks
2020-09-04 12:54:56 +02:00
class PushRuleEvaluatorForEvent:
def __init__(
self,
event: EventBase,
room_member_count: int,
sender_power_level: int,
power_levels: Dict[str, Union[int, Dict[str, int]]],
):
2016-01-18 15:09:47 +01:00
self._event = event
self._room_member_count = room_member_count
self._sender_power_level = sender_power_level
self._power_levels = power_levels
2016-01-18 15:09:47 +01:00
2016-01-18 16:42:23 +01:00
# Maps strings of e.g. 'content.body' -> event["content"]["body"]
2016-01-18 15:09:47 +01:00
self._value_cache = _flatten_dict(event)
def matches(
self, condition: Dict[str, Any], user_id: str, display_name: Optional[str]
) -> bool:
2019-06-20 11:32:02 +02:00
if condition["kind"] == "event_match":
2016-01-18 11:09:14 +01:00
return self._event_match(condition, user_id)
2019-06-20 11:32:02 +02:00
elif condition["kind"] == "contains_display_name":
2016-01-18 15:09:47 +01:00
return self._contains_display_name(display_name)
2019-06-20 11:32:02 +02:00
elif condition["kind"] == "room_member_count":
return _room_member_count(self._event, condition, self._room_member_count)
elif condition["kind"] == "sender_notification_permission":
return _sender_notification_permission(
2019-06-20 11:32:02 +02:00
self._event, condition, self._sender_power_level, self._power_levels
)
else:
return True
def _event_match(self, condition: dict, user_id: str) -> bool:
2019-06-20 11:32:02 +02:00
pattern = condition.get("pattern", None)
2016-01-18 15:09:47 +01:00
2016-01-18 11:09:14 +01:00
if not pattern:
2019-06-20 11:32:02 +02:00
pattern_type = condition.get("pattern_type", None)
2016-01-18 11:09:14 +01:00
if pattern_type == "user_id":
pattern = user_id
elif pattern_type == "user_localpart":
pattern = UserID.from_string(user_id).localpart
2016-01-18 15:09:47 +01:00
if not pattern:
logger.warning("event_match condition with no pattern")
2016-01-18 15:09:47 +01:00
return False
# XXX: optimisation: cache our pattern regexps
2019-06-20 11:32:02 +02:00
if condition["key"] == "content.body":
body = self._event.content.get("body", None)
if not body or not isinstance(body, str):
return False
2016-01-18 15:09:47 +01:00
return _glob_matches(pattern, body, word_boundary=True)
2016-01-18 15:09:47 +01:00
else:
2019-06-20 11:32:02 +02:00
haystack = self._get_value(condition["key"])
2016-01-18 15:09:47 +01:00
if haystack is None:
return False
return _glob_matches(pattern, haystack)
2016-01-18 15:09:47 +01:00
def _contains_display_name(self, display_name: Optional[str]) -> bool:
2016-01-18 15:09:47 +01:00
if not display_name:
return False
body = self._event.content.get("body", None)
if not body or not isinstance(body, str):
return False
2016-01-18 15:09:47 +01:00
# Similar to _glob_matches, but do not treat display_name as a glob.
r = regex_cache.get((display_name, False, True), None)
if not r:
2020-10-16 16:56:39 +02:00
r1 = re.escape(display_name)
r1 = to_word_pattern(r1)
2020-10-16 16:56:39 +02:00
r = re.compile(r1, flags=re.IGNORECASE)
regex_cache[(display_name, False, True)] = r
2020-10-16 16:56:39 +02:00
return bool(r.search(body))
2016-01-18 15:09:47 +01:00
def _get_value(self, dotted_key: str) -> Optional[str]:
2016-01-18 15:09:47 +01:00
return self._value_cache.get(dotted_key, None)
# Caches (string, is_glob, word_boundary) -> regex for push. See _glob_matches
regex_cache: LruCache[Tuple[str, bool, bool], Pattern] = LruCache(
2020-10-16 16:56:39 +02:00
50000, "regex_push_cache"
)
def _glob_matches(glob: str, value: str, word_boundary: bool = False) -> bool:
"""Tests if value matches glob.
2016-01-18 15:09:47 +01:00
Args:
glob
value: String to test against glob.
word_boundary: Whether to match against word boundaries or entire
string. Defaults to False.
"""
2016-01-18 18:04:36 +01:00
try:
r = regex_cache.get((glob, True, word_boundary), None)
if not r:
r = glob_to_regex(glob, word_boundary=word_boundary)
regex_cache[(glob, True, word_boundary)] = r
2020-10-16 16:56:39 +02:00
return bool(r.search(value))
2016-01-19 15:43:24 +01:00
except re.error:
logger.warning("Failed to parse glob to regex: %r", glob)
2016-01-19 15:43:24 +01:00
return False
2016-01-18 15:09:47 +01:00
def _flatten_dict(
d: Union[EventBase, JsonDict],
prefix: Optional[List[str]] = None,
result: Optional[Dict[str, str]] = None,
) -> Dict[str, str]:
if prefix is None:
prefix = []
if result is None:
result = {}
2016-01-18 15:09:47 +01:00
for key, value in d.items():
if isinstance(value, str):
2016-01-18 15:09:47 +01:00
result[".".join(prefix + [key])] = value.lower()
elif isinstance(value, dict):
2016-02-02 18:18:50 +01:00
_flatten_dict(value, prefix=(prefix + [key]), result=result)
2016-01-18 15:09:47 +01:00
return result