1 files changed, 354 insertions, 0 deletions
diff --git a/synapse/rest/client/push_rule.py b/synapse/rest/client/push_rule.py
new file mode 100644
index 00000000..702b351d
--- /dev/null
+++ b/synapse/rest/client/push_rule.py
@@ -0,0 +1,354 @@
+# 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 synapse.api.errors import (
+    NotFoundError,
+    StoreError,
+    SynapseError,
+    UnrecognizedRequestError,
+)
+from synapse.http.servlet import (
+    RestServlet,
+    parse_json_value_from_request,
+    parse_string,
+)
+from synapse.push.baserules import BASE_RULE_IDS, NEW_RULE_IDS
+from synapse.push.clientformat import format_push_rules_for_user
+from synapse.push.rulekinds import PRIORITY_CLASS_MAP
+from synapse.rest.client._base import client_patterns
+from synapse.storage.push_rule import InconsistentRuleException, RuleNotFoundException
+
+
+class PushRuleRestServlet(RestServlet):
+    PATTERNS = client_patterns("/(?P<path>pushrules/.*)$", v1=True)
+    SLIGHTLY_PEDANTIC_TRAILING_SLASH_ERROR = (
+        "Unrecognised request: You probably wanted a trailing slash"
+    )
+
+    def __init__(self, hs):
+        super().__init__()
+        self.auth = hs.get_auth()
+        self.store = hs.get_datastore()
+        self.notifier = hs.get_notifier()
+        self._is_worker = hs.config.worker_app is not None
+
+        self._users_new_default_push_rules = hs.config.users_new_default_push_rules
+
+    async def on_PUT(self, request, path):
+        if self._is_worker:
+            raise Exception("Cannot handle PUT /push_rules on worker")
+
+        spec = _rule_spec_from_path(path.split("/"))
+        try:
+            priority_class = _priority_class_from_spec(spec)
+        except InvalidRuleException as e:
+            raise SynapseError(400, str(e))
+
+        requester = await self.auth.get_user_by_req(request)
+
+        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)
+
+        user_id = requester.user.to_string()
+
+        if "attr" in spec:
+            await self.set_rule_attr(user_id, spec, content)
+            self.notify_user(user_id)
+            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:
+            raise SynapseError(400, str(e))
+
+        before = parse_string(request, "before")
+        if before:
+            before = _namespaced_rule_id(spec, before)
+
+        after = parse_string(request, "after")
+        if after:
+            after = _namespaced_rule_id(spec, after)
+
+        try:
+            await self.store.add_push_rule(
+                user_id=user_id,
+                rule_id=_namespaced_rule_id_from_spec(spec),
+                priority_class=priority_class,
+                conditions=conditions,
+                actions=actions,
+                before=before,
+                after=after,
+            )
+            self.notify_user(user_id)
+        except InconsistentRuleException as e:
+            raise SynapseError(400, str(e))
+        except RuleNotFoundException as e:
+            raise SynapseError(400, str(e))
+
+        return 200, {}
+
+    async def on_DELETE(self, request, path):
+        if self._is_worker:
+            raise Exception("Cannot handle DELETE /push_rules on worker")
+
+        spec = _rule_spec_from_path(path.split("/"))
+
+        requester = await self.auth.get_user_by_req(request)
+        user_id = requester.user.to_string()
+
+        namespaced_rule_id = _namespaced_rule_id_from_spec(spec)
+
+        try:
+            await self.store.delete_push_rule(user_id, namespaced_rule_id)
+            self.notify_user(user_id)
+            return 200, {}
+        except StoreError as e:
+            if e.code == 404:
+                raise NotFoundError()
+            else:
+                raise
+
+    async def on_GET(self, request, path):
+        requester = await self.auth.get_user_by_req(request)
+        user_id = 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.store.get_push_rules_for_user(user_id)
+
+        rules = format_push_rules_for_user(requester.user, rules)
+
+        path = path.split("/")[1:]
+
+        if path == []:
+            # we're a reference impl: pedantry is our job.
+            raise UnrecognizedRequestError(
+                PushRuleRestServlet.SLIGHTLY_PEDANTIC_TRAILING_SLASH_ERROR
+            )
+
+        if path[0] == "":
+            return 200, rules
+        elif path[0] == "global":
+            result = _filter_ruleset_with_path(rules["global"], path[1:])
+            return 200, result
+        else:
+            raise UnrecognizedRequestError()
+
+    def notify_user(self, user_id):
+        stream_id = self.store.get_max_push_rules_stream_id()
+        self.notifier.on_new_event("push_rules_key", stream_id, users=[user_id])
+
+    async def set_rule_attr(self, user_id, spec, val):
+        if spec["attr"] not in ("enabled", "actions"):
+            # for the sake of potential future expansion, shouldn't report
+            # 404 in the case of an unknown request so check it corresponds to
+            # a known attribute first.
+            raise UnrecognizedRequestError()
+
+        namespaced_rule_id = _namespaced_rule_id_from_spec(spec)
+        rule_id = spec["rule_id"]
+        is_default_rule = rule_id.startswith(".")
+        if is_default_rule:
+            if namespaced_rule_id not in BASE_RULE_IDS:
+                raise NotFoundError("Unknown rule %s" % (namespaced_rule_id,))
+        if spec["attr"] == "enabled":
+            if isinstance(val, dict) and "enabled" in val:
+                val = val["enabled"]
+            if not isinstance(val, bool):
+                # Legacy fallback
+                # This should *actually* take a dict, but many clients pass
+                # bools directly, so let's not break them.
+                raise SynapseError(400, "Value for 'enabled' must be boolean")
+            return await self.store.set_push_rule_enabled(
+                user_id, namespaced_rule_id, val, is_default_rule
+            )
+        elif spec["attr"] == "actions":
+            actions = val.get("actions")
+            _check_actions(actions)
+            namespaced_rule_id = _namespaced_rule_id_from_spec(spec)
+            rule_id = spec["rule_id"]
+            is_default_rule = rule_id.startswith(".")
+            if is_default_rule:
+                if user_id in self._users_new_default_push_rules:
+                    rule_ids = NEW_RULE_IDS
+                else:
+                    rule_ids = BASE_RULE_IDS
+
+                if namespaced_rule_id not in rule_ids:
+                    raise SynapseError(404, "Unknown rule %r" % (namespaced_rule_id,))
+            return await self.store.set_push_rule_actions(
+                user_id, namespaced_rule_id, actions, is_default_rule
+            )
+        else:
+            raise UnrecognizedRequestError()
+
+
+def _rule_spec_from_path(path):
+    """Turn a sequence of path components into a rule spec
+
+    Args:
+        path (sequence[unicode]): the URL path components.
+
+    Returns:
+        dict: rule spec dict, containing scope/template/rule_id entries,
+            and possibly attr.
+
+    Raises:
+        UnrecognizedRequestError if the path components cannot be parsed.
+    """
+    if len(path) < 2:
+        raise UnrecognizedRequestError()
+    if path[0] != "pushrules":
+        raise UnrecognizedRequestError()
+
+    scope = path[1]
+    path = path[2:]
+    if scope != "global":
+        raise UnrecognizedRequestError()
+
+    if len(path) == 0:
+        raise UnrecognizedRequestError()
+
+    template = path[0]
+    path = path[1:]
+
+    if len(path) == 0 or len(path[0]) == 0:
+        raise UnrecognizedRequestError()
+
+    rule_id = path[0]
+
+    spec = {"scope": scope, "template": template, "rule_id": rule_id}
+
+    path = path[1:]
+
+    if len(path) > 0 and len(path[0]) > 0:
+        spec["attr"] = path[0]
+
+    return spec
+
+
+def _rule_tuple_from_request_object(rule_template, rule_id, req_obj):
+    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 _check_actions(actions):
+    if not isinstance(actions, list):
+        raise InvalidRuleException("No actions found")
+
+    for a in actions:
+        if a in ["notify", "dont_notify", "coalesce"]:
+            pass
+        elif isinstance(a, dict) and "set_tweak" in a:
+            pass
+        else:
+            raise InvalidRuleException("Unrecognised action")
+
+
+def _filter_ruleset_with_path(ruleset, path):
+    if path == []:
+        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 == []:
+        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()
+
+
+def _priority_class_from_spec(spec):
+    if spec["template"] not in PRIORITY_CLASS_MAP.keys():
+        raise InvalidRuleException("Unknown template: %s" % (spec["template"]))
+    pc = PRIORITY_CLASS_MAP[spec["template"]]
+
+    return pc
+
+
+def _namespaced_rule_id_from_spec(spec):
+    return _namespaced_rule_id(spec, spec["rule_id"])
+
+
+def _namespaced_rule_id(spec, rule_id):
+    return "global/%s/%s" % (spec["template"], rule_id)
+
+
+class InvalidRuleException(Exception):
+    pass
+
+
+def register_servlets(hs, http_server):
+    PushRuleRestServlet(hs).register(http_server)