374 lines
12 KiB
Python
374 lines
12 KiB
Python
# Copyright 2014-2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from typing import TYPE_CHECKING, List, Optional, Sequence, Tuple, Union
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import attr
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from synapse.api.errors import (
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NotFoundError,
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StoreError,
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SynapseError,
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UnrecognizedRequestError,
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)
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from synapse.http.server import HttpServer
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from synapse.http.servlet import (
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RestServlet,
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parse_json_value_from_request,
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parse_string,
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)
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from synapse.http.site import SynapseRequest
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from synapse.push.baserules import BASE_RULE_IDS
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from synapse.push.clientformat import format_push_rules_for_user
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from synapse.push.rulekinds import PRIORITY_CLASS_MAP
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from synapse.rest.client._base import client_patterns
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from synapse.storage.push_rule import InconsistentRuleException, RuleNotFoundException
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from synapse.types import JsonDict
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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@attr.s(slots=True, frozen=True, auto_attribs=True)
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class RuleSpec:
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scope: str
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template: str
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rule_id: str
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attr: Optional[str]
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class PushRuleRestServlet(RestServlet):
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PATTERNS = client_patterns("/(?P<path>pushrules/.*)$", v1=True)
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SLIGHTLY_PEDANTIC_TRAILING_SLASH_ERROR = (
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"Unrecognised request: You probably wanted a trailing slash"
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)
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def __init__(self, hs: "HomeServer"):
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super().__init__()
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self.auth = hs.get_auth()
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self.store = hs.get_datastore()
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self.notifier = hs.get_notifier()
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self._is_worker = hs.config.worker.worker_app is not None
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async def on_PUT(self, request: SynapseRequest, path: str) -> Tuple[int, JsonDict]:
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if self._is_worker:
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raise Exception("Cannot handle PUT /push_rules on worker")
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spec = _rule_spec_from_path(path.split("/"))
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try:
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priority_class = _priority_class_from_spec(spec)
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except InvalidRuleException as e:
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raise SynapseError(400, str(e))
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requester = await self.auth.get_user_by_req(request)
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if "/" in spec.rule_id or "\\" in spec.rule_id:
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raise SynapseError(400, "rule_id may not contain slashes")
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content = parse_json_value_from_request(request)
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user_id = requester.user.to_string()
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if spec.attr:
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await self.set_rule_attr(user_id, spec, content)
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self.notify_user(user_id)
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return 200, {}
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if spec.rule_id.startswith("."):
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# Rule ids starting with '.' are reserved for server default rules.
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raise SynapseError(400, "cannot add new rule_ids that start with '.'")
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try:
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(conditions, actions) = _rule_tuple_from_request_object(
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spec.template, spec.rule_id, content
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)
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except InvalidRuleException as e:
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raise SynapseError(400, str(e))
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before = parse_string(request, "before")
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if before:
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before = _namespaced_rule_id(spec, before)
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after = parse_string(request, "after")
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if after:
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after = _namespaced_rule_id(spec, after)
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try:
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await self.store.add_push_rule(
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user_id=user_id,
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rule_id=_namespaced_rule_id_from_spec(spec),
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priority_class=priority_class,
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conditions=conditions,
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actions=actions,
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before=before,
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after=after,
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)
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self.notify_user(user_id)
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except InconsistentRuleException as e:
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raise SynapseError(400, str(e))
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except RuleNotFoundException as e:
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raise SynapseError(400, str(e))
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return 200, {}
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async def on_DELETE(
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self, request: SynapseRequest, path: str
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) -> Tuple[int, JsonDict]:
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if self._is_worker:
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raise Exception("Cannot handle DELETE /push_rules on worker")
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spec = _rule_spec_from_path(path.split("/"))
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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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namespaced_rule_id = _namespaced_rule_id_from_spec(spec)
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try:
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await self.store.delete_push_rule(user_id, namespaced_rule_id)
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self.notify_user(user_id)
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return 200, {}
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except StoreError as e:
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if e.code == 404:
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raise NotFoundError()
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else:
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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)
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user_id = requester.user.to_string()
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# we build up the full structure and then decide which bits of it
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# to send which means doing unnecessary work sometimes but is
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# is probably not going to make a whole lot of difference
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rules = await self.store.get_push_rules_for_user(user_id)
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rules = format_push_rules_for_user(requester.user, rules)
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path_parts = path.split("/")[1:]
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if path_parts == []:
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# we're a reference impl: pedantry is our job.
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raise UnrecognizedRequestError(
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PushRuleRestServlet.SLIGHTLY_PEDANTIC_TRAILING_SLASH_ERROR
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)
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if path_parts[0] == "":
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return 200, rules
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elif path_parts[0] == "global":
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result = _filter_ruleset_with_path(rules["global"], path_parts[1:])
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return 200, result
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else:
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raise UnrecognizedRequestError()
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def notify_user(self, user_id: str) -> None:
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stream_id = self.store.get_max_push_rules_stream_id()
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self.notifier.on_new_event("push_rules_key", stream_id, users=[user_id])
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async def set_rule_attr(
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self, user_id: str, spec: RuleSpec, val: Union[bool, JsonDict]
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) -> None:
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if spec.attr not in ("enabled", "actions"):
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# for the sake of potential future expansion, shouldn't report
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# 404 in the case of an unknown request so check it corresponds to
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# a known attribute first.
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raise UnrecognizedRequestError()
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namespaced_rule_id = _namespaced_rule_id_from_spec(spec)
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rule_id = spec.rule_id
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is_default_rule = rule_id.startswith(".")
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if is_default_rule:
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if namespaced_rule_id not in BASE_RULE_IDS:
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raise NotFoundError("Unknown rule %s" % (namespaced_rule_id,))
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if spec.attr == "enabled":
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if isinstance(val, dict) and "enabled" in val:
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val = val["enabled"]
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if not isinstance(val, bool):
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# Legacy fallback
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# This should *actually* take a dict, but many clients pass
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# bools directly, so let's not break them.
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raise SynapseError(400, "Value for 'enabled' must be boolean")
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await self.store.set_push_rule_enabled(
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user_id, namespaced_rule_id, val, is_default_rule
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)
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elif spec.attr == "actions":
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if not isinstance(val, dict):
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raise SynapseError(400, "Value must be a dict")
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actions = val.get("actions")
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if not isinstance(actions, list):
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raise SynapseError(400, "Value for 'actions' must be dict")
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_check_actions(actions)
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namespaced_rule_id = _namespaced_rule_id_from_spec(spec)
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rule_id = spec.rule_id
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is_default_rule = rule_id.startswith(".")
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if is_default_rule:
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if namespaced_rule_id not in BASE_RULE_IDS:
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raise SynapseError(404, "Unknown rule %r" % (namespaced_rule_id,))
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await self.store.set_push_rule_actions(
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user_id, namespaced_rule_id, actions, is_default_rule
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)
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else:
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raise UnrecognizedRequestError()
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def _rule_spec_from_path(path: Sequence[str]) -> RuleSpec:
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"""Turn a sequence of path components into a rule spec
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Args:
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path: the URL path components.
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Returns:
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rule spec, containing scope/template/rule_id entries, and possibly attr.
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Raises:
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UnrecognizedRequestError if the path components cannot be parsed.
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"""
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if len(path) < 2:
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raise UnrecognizedRequestError()
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if path[0] != "pushrules":
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raise UnrecognizedRequestError()
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scope = path[1]
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path = path[2:]
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if scope != "global":
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raise UnrecognizedRequestError()
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if len(path) == 0:
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raise UnrecognizedRequestError()
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template = path[0]
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path = path[1:]
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if len(path) == 0 or len(path[0]) == 0:
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raise UnrecognizedRequestError()
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rule_id = path[0]
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path = path[1:]
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attr = None
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if len(path) > 0 and len(path[0]) > 0:
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attr = path[0]
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return RuleSpec(scope, template, rule_id, attr)
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def _rule_tuple_from_request_object(
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rule_template: str, rule_id: str, req_obj: JsonDict
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) -> Tuple[List[JsonDict], List[Union[str, JsonDict]]]:
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if rule_template in ["override", "underride"]:
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if "conditions" not in req_obj:
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raise InvalidRuleException("Missing 'conditions'")
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conditions = req_obj["conditions"]
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for c in conditions:
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if "kind" not in c:
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raise InvalidRuleException("Condition without 'kind'")
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elif rule_template == "room":
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conditions = [{"kind": "event_match", "key": "room_id", "pattern": rule_id}]
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elif rule_template == "sender":
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conditions = [{"kind": "event_match", "key": "user_id", "pattern": rule_id}]
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elif rule_template == "content":
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if "pattern" not in req_obj:
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raise InvalidRuleException("Content rule missing 'pattern'")
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pat = req_obj["pattern"]
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conditions = [{"kind": "event_match", "key": "content.body", "pattern": pat}]
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else:
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raise InvalidRuleException("Unknown rule template: %s" % (rule_template,))
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if "actions" not in req_obj:
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raise InvalidRuleException("No actions found")
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actions = req_obj["actions"]
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_check_actions(actions)
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return conditions, actions
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def _check_actions(actions: List[Union[str, JsonDict]]) -> None:
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if not isinstance(actions, list):
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raise InvalidRuleException("No actions found")
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for a in actions:
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if a in ["notify", "dont_notify", "coalesce"]:
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pass
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elif isinstance(a, dict) and "set_tweak" in a:
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pass
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else:
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raise InvalidRuleException("Unrecognised action")
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def _filter_ruleset_with_path(ruleset: JsonDict, path: List[str]) -> JsonDict:
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if path == []:
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raise UnrecognizedRequestError(
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PushRuleRestServlet.SLIGHTLY_PEDANTIC_TRAILING_SLASH_ERROR
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)
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if path[0] == "":
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return ruleset
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template_kind = path[0]
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if template_kind not in ruleset:
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raise UnrecognizedRequestError()
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path = path[1:]
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if path == []:
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raise UnrecognizedRequestError(
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PushRuleRestServlet.SLIGHTLY_PEDANTIC_TRAILING_SLASH_ERROR
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)
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if path[0] == "":
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return ruleset[template_kind]
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rule_id = path[0]
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the_rule = None
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for r in ruleset[template_kind]:
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if r["rule_id"] == rule_id:
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the_rule = r
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if the_rule is None:
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raise NotFoundError()
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path = path[1:]
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if len(path) == 0:
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return the_rule
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attr = path[0]
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if attr in the_rule:
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# Make sure we return a JSON object as the attribute may be a
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# JSON value.
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return {attr: the_rule[attr]}
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else:
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raise UnrecognizedRequestError()
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def _priority_class_from_spec(spec: RuleSpec) -> int:
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if spec.template not in PRIORITY_CLASS_MAP.keys():
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raise InvalidRuleException("Unknown template: %s" % (spec.template))
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pc = PRIORITY_CLASS_MAP[spec.template]
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return pc
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def _namespaced_rule_id_from_spec(spec: RuleSpec) -> str:
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return _namespaced_rule_id(spec, spec.rule_id)
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def _namespaced_rule_id(spec: RuleSpec, rule_id: str) -> str:
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return "global/%s/%s" % (spec.template, rule_id)
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class InvalidRuleException(Exception):
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pass
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def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
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PushRuleRestServlet(hs).register(http_server)
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