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# -*- coding: utf-8 -*-
# Copyright 2015 OpenMarket 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.
from twisted.internet import defer
from synapse.types import UserID
import baserules
import logging
import simplejson as json
import re
logger = logging.getLogger(__name__)
@defer.inlineCallbacks
def evaluator_for_user_name_and_profile_tag(user_name, profile_tag, room_id, store):
rawrules = yield store.get_push_rules_for_user(user_name)
enabled_map = yield store.get_push_rules_enabled_for_user(user_name)
our_member_event = yield store.get_current_state(
room_id=room_id,
event_type='m.room.member',
state_key=user_name,
)
defer.returnValue(PushRuleEvaluator(
user_name, profile_tag, rawrules, enabled_map,
room_id, our_member_event, store
))
class PushRuleEvaluator:
DEFAULT_ACTIONS = []
INEQUALITY_EXPR = re.compile("^([=<>]*)([0-9]*)$")
def __init__(self, user_name, profile_tag, raw_rules, enabled_map, room_id,
our_member_event, store):
self.user_name = user_name
self.profile_tag = profile_tag
self.room_id = room_id
self.our_member_event = our_member_event
self.store = store
rules = []
for raw_rule in raw_rules:
rule = dict(raw_rule)
rule['conditions'] = json.loads(raw_rule['conditions'])
rule['actions'] = json.loads(raw_rule['actions'])
rules.append(rule)
user = UserID.from_string(self.user_name)
self.rules = baserules.list_with_base_rules(rules, user)
self.enabled_map = enabled_map
@staticmethod
def tweaks_for_actions(actions):
tweaks = {}
for a in actions:
if not isinstance(a, dict):
continue
if 'set_tweak' in a and 'value' in a:
tweaks[a['set_tweak']] = a['value']
return tweaks
@defer.inlineCallbacks
def actions_for_event(self, ev):
"""
This should take into account notification settings that the user
has configured both globally and per-room when we have the ability
to do such things.
"""
if ev['user_id'] == self.user_name:
# let's assume you probably know about messages you sent yourself
defer.returnValue([])
room_id = ev['room_id']
# get *our* member event for display name matching
my_display_name = None
if self.our_member_event:
my_display_name = self.our_member_event[0].content.get("displayname")
room_members = yield self.store.get_users_in_room(room_id)
room_member_count = len(room_members)
for r in self.rules:
if r['rule_id'] in self.enabled_map:
r['enabled'] = self.enabled_map[r['rule_id']]
elif 'enabled' not in r:
r['enabled'] = True
if not r['enabled']:
continue
matches = True
conditions = r['conditions']
actions = r['actions']
for c in conditions:
matches &= self._event_fulfills_condition(
ev, c, display_name=my_display_name,
room_member_count=room_member_count
)
logger.debug(
"Rule %s %s",
r['rule_id'], "matches" if matches else "doesn't match"
)
# ignore rules with no actions (we have an explict 'dont_notify')
if len(actions) == 0:
logger.warn(
"Ignoring rule id %s with no actions for user %s",
r['rule_id'], self.user_name
)
continue
if matches:
logger.info(
"%s matches for user %s, event %s",
r['rule_id'], self.user_name, ev['event_id']
)
# filter out dont_notify as we treat an empty actions list
# as dont_notify, and this doesn't take up a row in our database
actions = [x for x in actions if x != 'dont_notify']
defer.returnValue(actions)
logger.info(
"No rules match for user %s, event %s",
self.user_name, ev['event_id']
)
defer.returnValue(PushRuleEvaluator.DEFAULT_ACTIONS)
@staticmethod
def _glob_to_regexp(glob):
r = re.escape(glob)
r = re.sub(r'\\\*', r'.*?', r)
r = re.sub(r'\\\?', r'.', r)
# handle [abc], [a-z] and [!a-z] style ranges.
r = re.sub(r'\\\[(\\\!|)(.*)\\\]',
lambda x: ('[%s%s]' % (x.group(1) and '^' or '',
re.sub(r'\\\-', '-', x.group(2)))), r)
return r
def _event_fulfills_condition(self, ev, condition, display_name, room_member_count):
if condition['kind'] == 'event_match':
if 'pattern' not in condition:
logger.warn("event_match condition with no pattern")
return False
# XXX: optimisation: cache our pattern regexps
if condition['key'] == 'content.body':
r = r'\b%s\b' % self._glob_to_regexp(condition['pattern'])
else:
r = r'^%s$' % self._glob_to_regexp(condition['pattern'])
val = _value_for_dotted_key(condition['key'], ev)
if val is None:
return False
return re.search(r, val, flags=re.IGNORECASE) is not None
elif condition['kind'] == 'device':
if 'profile_tag' not in condition:
return True
return condition['profile_tag'] == self.profile_tag
elif condition['kind'] == 'contains_display_name':
# This is special because display names can be different
# between rooms and so you can't really hard code it in a rule.
# Optimisation: we should cache these names and update them from
# the event stream.
if 'content' not in ev or 'body' not in ev['content']:
return False
if not display_name:
return False
return re.search(
r"\b%s\b" % re.escape(display_name), ev['content']['body'],
flags=re.IGNORECASE
) is not None
elif condition['kind'] == 'room_member_count':
if 'is' not in condition:
return False
m = PushRuleEvaluator.INEQUALITY_EXPR.match(condition['is'])
if not m:
return False
ineq = m.group(1)
rhs = m.group(2)
if not rhs.isdigit():
return False
rhs = int(rhs)
if ineq == '' or ineq == '==':
return room_member_count == rhs
elif ineq == '<':
return room_member_count < rhs
elif ineq == '>':
return room_member_count > rhs
elif ineq == '>=':
return room_member_count >= rhs
elif ineq == '<=':
return room_member_count <= rhs
else:
return False
else:
return True
def _value_for_dotted_key(dotted_key, event):
parts = dotted_key.split(".")
val = event
while len(parts) > 0:
if parts[0] not in val:
return None
val = val[parts[0]]
parts = parts[1:]
return val
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