move notifications logic over from riot-web

src/notifications/NotificationUtils.js

@@ -0,0 +1,89 @@
+/*
+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.
+*/
+
+'use strict';
+
+module.exports = {
+    // Encodes a dictionary of {
+    //   "notify": true/false,
+    //   "sound": string or undefined,
+    //   "highlight: true/false,
+    // }
+    // to a list of push actions.
+    encodeActions: function(action) {
+        var notify = action.notify;
+        var sound = action.sound;
+        var highlight = action.highlight;
+        if (notify) {
+            var actions = ["notify"];
+            if (sound) {
+                actions.push({"set_tweak": "sound", "value": sound});
+            }
+            if (highlight) {
+                actions.push({"set_tweak": "highlight"});
+            } else {
+                actions.push({"set_tweak": "highlight", "value": false});
+            }
+            return actions;
+        } else {
+            return ["dont_notify"];
+        }
+    },
+
+    // Decode a list of actions to a dictionary of {
+    //   "notify": true/false,
+    //   "sound": string or undefined,
+    //   "highlight: true/false,
+    // }
+    // If the actions couldn't be decoded then returns null.
+    decodeActions: function(actions) {
+        var notify = false;
+        var sound = null;
+        var highlight = false;
+
+        for (var i = 0; i < actions.length; ++i) {
+            var action = actions[i];
+            if (action === "notify") {
+                notify = true;
+            } else if (action === "dont_notify") {
+                notify = false;
+            } else if (typeof action === 'object') {
+                if (action.set_tweak === "sound") {
+                    sound = action.value
+                } else if (action.set_tweak === "highlight") {
+                    highlight = action.value;
+                } else {
+                    // We don't understand this kind of tweak, so give up.
+                    return null;
+                }
+            } else {
+                // We don't understand this kind of action, so give up.
+                return null;
+            }
+        }
+
+        if (highlight === undefined) {
+            // If a highlight tweak is missing a value then it defaults to true.
+            highlight = true;
+        }
+
+        var result = {notify: notify, highlight: highlight};
+        if (sound !== null) {
+            result.sound = sound;
+        }
+        return result;
+    },
+};