Read all 4 different notif states

Can't yet set loud / mute

src/notifications/RoomNotifs.js

@@ -0,0 +1,70 @@
+/*
+Copyright 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.
+*/
+
+import MatrixClientPeg from 'matrix-react-sdk/lib/MatrixClientPeg';
+import PushProcessor from 'matrix-js-sdk/lib/pushprocessor';
+
+export function getVectorRoomNotifsState(roomId) {
+    // look through the override rules for a rule affecting this room:
+    // if one exists, it will take precedence.
+    for (const rule of MatrixClientPeg.get().pushRules['global'].override) {
+        if (isRuleForRoom(roomId, rule)) {
+            if (isMuteRule(rule)) {
+                return 'mute';
+            }
+        }
+    }
+
+    // for everything else, look at the room rule.
+    const roomRule = MatrixClientPeg.get().getRoomPushRule('global', roomId);
+
+    // XXX: We have to assume the default is to notify for all messages
+    // (in particular this will be 'wrong' for one to one rooms because
+    // they will notify loudly for all messages)
+    if (!roomRule) return 'all_messages';
+
+    // a mute at the room level will still allow mentions
+    // to notify
+    if (isMuteRule(roomRule)) return 'mentions_only';
+
+    const actionsObject = PushProcessor.actionListToActionsObject(roomRule.actions);
+    if (actionsObject.tweaks.sound) return 'all_messages_loud';
+
+    return null;
+}
+
+function isRuleForRoom(roomId, rule) {
+    if (rule.conditions.length !== 1) {
+        return false;
+    }
+    const cond = rule.conditions[0];
+    if (
+        cond.kind == 'event_match'  &&
+        cond.key == 'room_id' &&
+        cond.pattern == roomId
+    ) {
+        return true;
+    }
+    return false;
+}
+
+function isMuteRule(rule) {
+    return (
+        rule.actions.length == 1 &&
+        rule.actions[0] == 'dont_notify'
+    );
+}
+