Initial support for notification settings

Signed-off-by: Travis Ralston <travpc@gmail.com>

src/settings/handlers/RoomDeviceSettingsHandler.js

@@ -0,0 +1,77 @@
+/*
+Copyright 2017 Travis Ralston
+
+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 Promise from 'bluebird';
+import SettingsHandler from "./SettingsHandler";
+
+/**
+ * Gets and sets settings at the "room-device" level for the current device in a particular
+ * room.
+ */
+export default class RoomDeviceSettingsHandler extends SettingsHandler {
+    getValue(settingName, roomId) {
+        // Special case blacklist setting to use legacy values
+        if (settingName === "blacklistUnverifiedDevices") {
+            const value = this._read("mx_local_settings");
+            if (value && value['blacklistUnverifiedDevicesPerRoom']) {
+                return value['blacklistUnverifiedDevicesPerRoom'][roomId];
+            }
+        }
+
+        const value = this._read(this._getKey(settingName, roomId));
+        if (value) return value.value;
+        return null;
+    }
+
+    setValue(settingName, roomId, newValue) {
+        // Special case blacklist setting for legacy structure
+        if (settingName === "blacklistUnverifiedDevices") {
+            let value = this._read("mx_local_settings");
+            if (!value) value = {};
+            if (!value["blacklistUnverifiedDevicesPerRoom"]) value["blacklistUnverifiedDevicesPerRoom"] = {};
+            value["blacklistUnverifiedDevicesPerRoom"][roomId] = newValue;
+            localStorage.setItem("mx_local_settings", JSON.stringify(value));
+            return Promise.resolve();
+        }
+
+        if (newValue === null) {
+            localStorage.removeItem(this._getKey(settingName, roomId));
+        } else {
+            newValue = JSON.stringify({value: newValue});
+            localStorage.setItem(this._getKey(settingName, roomId), newValue);
+        }
+
+        return Promise.resolve();
+    }
+
+    canSetValue(settingName, roomId) {
+        return true; // It's their device, so they should be able to
+    }
+
+    isSupported() {
+        return localStorage !== undefined && localStorage !== null;
+    }
+
+    _read(key) {
+        const rawValue = localStorage.getItem(key);
+        if (!rawValue) return null;
+        return JSON.parse(rawValue);
+    }
+
+    _getKey(settingName, roomId) {
+        return "mx_setting_" + settingName + "_" + roomId;
+    }
+}