forked-synapse/synapse/rest/client/push_rule.py

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# Copyright 2014-2016 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 typing import TYPE_CHECKING, List, Tuple, Union
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from synapse.api.errors import (
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NotFoundError,
StoreError,
SynapseError,
UnrecognizedRequestError,
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)
from synapse.handlers.push_rules import InvalidRuleException, RuleSpec, check_actions
from synapse.http.server import HttpServer
from synapse.http.servlet import (
RestServlet,
parse_json_value_from_request,
parse_string,
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)
from synapse.http.site import SynapseRequest
from synapse.push.rulekinds import PRIORITY_CLASS_MAP
from synapse.rest.client._base import client_patterns
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from synapse.storage.push_rule import InconsistentRuleException, RuleNotFoundException
from synapse.types import JsonDict
from synapse.util.async_helpers import Linearizer
if TYPE_CHECKING:
from synapse.server import HomeServer
class PushRuleRestServlet(RestServlet):
PATTERNS = client_patterns("/(?P<path>pushrules/.*)$", v1=True)
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SLIGHTLY_PEDANTIC_TRAILING_SLASH_ERROR = (
"Unrecognised request: You probably wanted a trailing slash"
)
WORKERS_DENIED_METHODS = ["PUT", "DELETE"]
CATEGORY = "Push rule requests"
def __init__(self, hs: "HomeServer"):
super().__init__()
self.auth = hs.get_auth()
self.store = hs.get_datastores().main
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self.notifier = hs.get_notifier()
self._is_worker = hs.config.worker.worker_app is not None
self._push_rules_handler = hs.get_push_rules_handler()
self._push_rule_linearizer = Linearizer(name="push_rules")
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async def on_PUT(self, request: SynapseRequest, path: str) -> Tuple[int, JsonDict]:
if self._is_worker:
raise Exception("Cannot handle PUT /push_rules on worker")
requester = await self.auth.get_user_by_req(request)
user_id = requester.user.to_string()
async with self._push_rule_linearizer.queue(user_id):
return await self.handle_put(request, path, user_id)
async def handle_put(
self, request: SynapseRequest, path: str, user_id: str
) -> Tuple[int, JsonDict]:
spec = _rule_spec_from_path(path.split("/"))
try:
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priority_class = _priority_class_from_spec(spec)
except InvalidRuleException as e:
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raise SynapseError(400, str(e))
if "/" in spec.rule_id or "\\" in spec.rule_id:
raise SynapseError(400, "rule_id may not contain slashes")
content = parse_json_value_from_request(request)
if spec.attr:
try:
await self._push_rules_handler.set_rule_attr(user_id, spec, content)
except InvalidRuleException as e:
raise SynapseError(400, "Invalid actions: %s" % e)
except RuleNotFoundException:
raise NotFoundError("Unknown rule")
return 200, {}
if spec.rule_id.startswith("."):
# Rule ids starting with '.' are reserved for server default rules.
raise SynapseError(400, "cannot add new rule_ids that start with '.'")
try:
(conditions, actions) = _rule_tuple_from_request_object(
spec.template, spec.rule_id, content
)
except InvalidRuleException as e:
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raise SynapseError(400, str(e))
before = parse_string(request, "before")
if before:
before = f"global/{spec.template}/{before}"
after = parse_string(request, "after")
if after:
after = f"global/{spec.template}/{after}"
try:
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await self.store.add_push_rule(
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user_id=user_id,
rule_id=f"global/{spec.template}/{spec.rule_id}",
priority_class=priority_class,
conditions=conditions,
actions=actions,
before=before,
after=after,
)
self._push_rules_handler.notify_user(user_id)
except InconsistentRuleException as e:
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raise SynapseError(400, str(e))
except RuleNotFoundException as e:
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raise SynapseError(400, str(e))
return 200, {}
async def on_DELETE(
self, request: SynapseRequest, path: str
) -> Tuple[int, JsonDict]:
if self._is_worker:
raise Exception("Cannot handle DELETE /push_rules on worker")
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requester = await self.auth.get_user_by_req(request)
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user_id = requester.user.to_string()
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async with self._push_rule_linearizer.queue(user_id):
return await self.handle_delete(request, path, user_id)
async def handle_delete(
self,
request: SynapseRequest,
path: str,
user_id: str,
) -> Tuple[int, JsonDict]:
spec = _rule_spec_from_path(path.split("/"))
namespaced_rule_id = f"global/{spec.template}/{spec.rule_id}"
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try:
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await self.store.delete_push_rule(user_id, namespaced_rule_id)
self._push_rules_handler.notify_user(user_id)
return 200, {}
except StoreError as e:
if e.code == 404:
raise NotFoundError()
else:
raise
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async def on_GET(self, request: SynapseRequest, path: str) -> Tuple[int, JsonDict]:
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requester = await self.auth.get_user_by_req(request)
requester.user.to_string()
# we build up the full structure and then decide which bits of it
# to send which means doing unnecessary work sometimes but is
# is probably not going to make a whole lot of difference
rules = await self._push_rules_handler.push_rules_for_user(requester.user)
path_parts = path.split("/")[1:]
if path_parts == []:
# we're a reference impl: pedantry is our job.
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raise UnrecognizedRequestError(
PushRuleRestServlet.SLIGHTLY_PEDANTIC_TRAILING_SLASH_ERROR
)
if path_parts[0] == "":
return 200, rules
elif path_parts[0] == "global":
result = _filter_ruleset_with_path(rules["global"], path_parts[1:])
return 200, result
else:
raise UnrecognizedRequestError()
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def _rule_spec_from_path(path: List[str]) -> RuleSpec:
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"""Turn a sequence of path components into a rule spec
Args:
path: the URL path components.
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Returns:
rule spec, containing scope/template/rule_id entries, and possibly attr.
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Raises:
UnrecognizedRequestError if the path components cannot be parsed.
"""
if len(path) < 2:
raise UnrecognizedRequestError()
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if path[0] != "pushrules":
raise UnrecognizedRequestError()
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scope = path[1]
path = path[2:]
if scope != "global":
raise UnrecognizedRequestError()
if len(path) == 0:
raise UnrecognizedRequestError()
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template = path[0]
path = path[1:]
if len(path) == 0 or len(path[0]) == 0:
raise UnrecognizedRequestError()
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rule_id = path[0]
path = path[1:]
attr = None
if len(path) > 0 and len(path[0]) > 0:
attr = path[0]
return RuleSpec(scope, template, rule_id, attr)
def _rule_tuple_from_request_object(
rule_template: str, rule_id: str, req_obj: JsonDict
) -> Tuple[List[JsonDict], List[Union[str, JsonDict]]]:
if rule_template in ["override", "underride"]:
if "conditions" not in req_obj:
raise InvalidRuleException("Missing 'conditions'")
conditions = req_obj["conditions"]
for c in conditions:
if "kind" not in c:
raise InvalidRuleException("Condition without 'kind'")
elif rule_template == "room":
conditions = [{"kind": "event_match", "key": "room_id", "pattern": rule_id}]
elif rule_template == "sender":
conditions = [{"kind": "event_match", "key": "user_id", "pattern": rule_id}]
elif rule_template == "content":
if "pattern" not in req_obj:
raise InvalidRuleException("Content rule missing 'pattern'")
pat = req_obj["pattern"]
conditions = [{"kind": "event_match", "key": "content.body", "pattern": pat}]
else:
raise InvalidRuleException("Unknown rule template: %s" % (rule_template,))
if "actions" not in req_obj:
raise InvalidRuleException("No actions found")
actions = req_obj["actions"]
check_actions(actions)
return conditions, actions
def _filter_ruleset_with_path(ruleset: JsonDict, path: List[str]) -> JsonDict:
if path == []:
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raise UnrecognizedRequestError(
PushRuleRestServlet.SLIGHTLY_PEDANTIC_TRAILING_SLASH_ERROR
)
if path[0] == "":
return ruleset
template_kind = path[0]
if template_kind not in ruleset:
raise UnrecognizedRequestError()
path = path[1:]
if path == []:
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raise UnrecognizedRequestError(
PushRuleRestServlet.SLIGHTLY_PEDANTIC_TRAILING_SLASH_ERROR
)
if path[0] == "":
return ruleset[template_kind]
rule_id = path[0]
the_rule = None
for r in ruleset[template_kind]:
if r["rule_id"] == rule_id:
the_rule = r
if the_rule is None:
raise NotFoundError()
path = path[1:]
if len(path) == 0:
return the_rule
attr = path[0]
if attr in the_rule:
# Make sure we return a JSON object as the attribute may be a
# JSON value.
return {attr: the_rule[attr]}
else:
raise UnrecognizedRequestError()
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def _priority_class_from_spec(spec: RuleSpec) -> int:
if spec.template not in PRIORITY_CLASS_MAP.keys():
raise InvalidRuleException("Unknown template: %s" % (spec.template))
pc = PRIORITY_CLASS_MAP[spec.template]
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return pc
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def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
PushRuleRestServlet(hs).register(http_server)