From 9d110d58e5b8b1a759eaf4adf1085d6ce8410706 Mon Sep 17 00:00:00 2001
From: Kegan Dougal <kegan@matrix.org>
Date: Mon, 20 Jul 2015 17:14:29 +0100
Subject: [PATCH] Manage presence of the client (same semantics as angular)

---
 src/Presence.js                     | 105 ++++++++++++++++++++++++++++
 src/controllers/pages/MatrixChat.js |   4 +-
 2 files changed, 108 insertions(+), 1 deletion(-)
 create mode 100644 src/Presence.js

diff --git a/src/Presence.js b/src/Presence.js
new file mode 100644
index 0000000000..ce1d5d10fc
--- /dev/null
+++ b/src/Presence.js
@@ -0,0 +1,105 @@
+/*
+Copyright 2015 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";
+var MatrixClientPeg = require("./MatrixClientPeg");
+
+ // Time in ms after that a user is considered as unavailable/away
+var UNAVAILABLE_TIME_MS = 3 * 60 * 1000; // 3 mins
+var PRESENCE_STATES = ["online", "offline", "unavailable"];
+
+// The current presence state
+var state, timer;
+
+module.exports = {
+
+    /**
+     * Start listening the user activity to evaluate his presence state.
+     * Any state change will be sent to the Home Server.
+     */
+    start: function() {
+        var self = this;
+        this.running = true;
+        if (undefined === state) {
+            // The user is online if they move the mouse or press a key
+            document.onmousemove = function() { self._resetTimer(); };
+            document.onkeypress = function() { self._resetTimer(); };
+            this._resetTimer();
+        }
+    },
+
+    /**
+     * Stop tracking user activity
+     */
+    stop: function() {
+        this.running = false;
+        if (timer) {
+            clearTimeout(timer);
+            timer = undefined;
+        }
+        state = undefined;
+    },
+
+    /**
+     * Get the current presence state.
+     * @returns {string} the presence state (see PRESENCE enum)
+     */
+    getState: function() {
+        return state;
+    },
+
+    /**
+     * Set the presence state.
+     * If the state has changed, the Home Server will be notified.
+     * @param {string} newState the new presence state (see PRESENCE enum)
+     */
+    setState: function(newState) {
+        if (newState === state) {
+            return;
+        }
+        if (PRESENCE_STATES.indexOf(newState) === -1) {
+            throw new Error("Bad presence state: " + newState);
+        }
+        if (!this.running) {
+            return;
+        }
+        state = newState;
+        MatrixClientPeg.get().setPresence(state).catch(function(err) {
+            console.error("Failed to set presence: %s", err);
+        });
+    },
+
+    /**
+     * Callback called when the user made no action on the page for UNAVAILABLE_TIME ms.
+     * @private
+     */
+    _onUnavailableTimerFire: function() {
+        this.setState("unavailable");
+    },
+
+    /**
+     * Callback called when the user made an action on the page
+     * @private
+     */
+    _resetTimer: function() {
+        var self = this;
+        this.setState("online");
+        // Re-arm the timer
+        clearTimeout(timer);
+        timer = setTimeout(function() {
+            self._onUnavailableTimerFire();
+        }, UNAVAILABLE_TIME_MS);
+    } 
+};
\ No newline at end of file
diff --git a/src/controllers/pages/MatrixChat.js b/src/controllers/pages/MatrixChat.js
index 48c55fe090..91fbeaebf8 100644
--- a/src/controllers/pages/MatrixChat.js
+++ b/src/controllers/pages/MatrixChat.js
@@ -21,7 +21,7 @@ var Loader = require("react-loader");
 
 var MatrixClientPeg = require("../../MatrixClientPeg");
 var RoomListSorter = require("../../RoomListSorter");
-
+var Presence = require("../../Presence");
 var dis = require("../../dispatcher");
 
 var ComponentBroker = require('../../ComponentBroker');
@@ -89,6 +89,7 @@ module.exports = {
                     window.localStorage.clear();
                 }
                 Notifier.stop();
+                Presence.stop();
                 MatrixClientPeg.get().removeAllListeners();
                 MatrixClientPeg.replace(null);
                 break;
@@ -187,6 +188,7 @@ module.exports = {
             });
         });
         Notifier.start();
+        Presence.start();
         cli.startClient();
     },