Warn users when the drive is offline

www/common/outer/async-store.js

@@ -1000,6 +1000,9 @@ define([
             }).nThen(cb);
         };
         Store.setPadTitle = function (clientId, data, cb) {
+            if (store.offline) {
+                return void cb({ error: 'OFFLINE' });
+            }
             var title = data.title;
             var href = data.href;
             var channel = data.channel;
@@ -1811,6 +1814,10 @@ define([
             if (!cmdData || !cmdData.cmd) { return; }
             //var data = cmdData.data;
             var s = getStore(cmdData.teamId);
+            if (s.offline) {
+              broadcast([], 'NETWORK_DISCONNECT');
+              return void cb({ error: 'OFFLINE' });
+            }
             var cb2 = function (data2) {
                 // Send the CHANGE event to all the stores because the command may have
                 // affected data from a shared folder used by multiple teams.
@@ -2237,9 +2244,11 @@ define([
             });
 
             rt.proxy.on('disconnect', function () {
+                store.offline = true;
                 broadcast([], 'NETWORK_DISCONNECT');
             });
             rt.proxy.on('reconnect', function (info) {
+                store.offline = false;
                 broadcast([], 'NETWORK_RECONNECT', {myId: info.myId});
             });
 

www/common/outer/team.js

@@ -74,6 +74,12 @@ define([
                 path: p
             });
         });
+        proxy.on('disconnect', function () {
+            team.offline = true;
+        });
+        proxy.on('reconnect', function (info) {
+            team.offline = false;
+        });
     };
 
     var closeTeam = function (ctx, teamId) {

www/common/sframe-common-outer.js

@@ -457,7 +457,7 @@ define([
                     path: initialPathInDrive // Where to store the pad if we don't have it in our drive
                 };
                 Cryptpad.setPadTitle(data, function (err) {
-                    cb(err);
+                    cb({error: err});
                 });
             });
             sframeChan.on('EV_SET_TAB_TITLE', function (newTabTitle) {

www/common/sframe-common-title.js

@@ -64,10 +64,13 @@ define([
             sframeChan.query('Q_SET_PAD_TITLE_IN_DRIVE', {
                 title: title,
                 defaultTitle: defaultTitle
-            }, function (err) {
+            }, function (err, obj) {
+                err = err || (obj && obj.error);
                 if (err === 'E_OVER_LIMIT') {
                     return void UI.alert(Messages.pinLimitNotPinned, null, true);
-                } else if (err) { return; }
+                } else if (err) {
+                    return UI.alert(Messages.driveOfflineError);
+                }
                 evTitleChange.fire(title);
                 if (titleUpdated) {
                     titleUpdated(undefined, title);