Restore full hash when safe hash is deleted from the drive

www/common/cryptpad-common.js

@@ -845,6 +845,7 @@ define([
     pad.onConnectEvent = Util.mkEvent();
     pad.onErrorEvent = Util.mkEvent();
     pad.onMetadataEvent = Util.mkEvent();
+    pad.onChannelDeleted = Util.mkEvent();
 
     pad.requestAccess = function (data, cb) {
         postMessage("REQUEST_PAD_ACCESS", data, cb);
@@ -1753,6 +1754,7 @@ define([
         PAD_CONNECT: common.padRpc.onConnectEvent.fire,
         PAD_ERROR: common.padRpc.onErrorEvent.fire,
         PAD_METADATA: common.padRpc.onMetadataEvent.fire,
+        CHANNEL_DELETED: common.padRpc.onChannelDeleted.fire,
         // Drive
         DRIVE_LOG: common.drive.onLog.fire,
         DRIVE_CHANGE: common.drive.onChange.fire,
@@ -1896,7 +1898,7 @@ define([
                 anonHash: LocalStore.getFSHash(),
                 localToken: tryParsing(localStorage.getItem(Constants.tokenKey)), // TODO move this to LocalStore ?
                 language: common.getLanguage(),
-                driveEvents: rdyCfg.driveEvents // Boolean
+                driveEvents: true //rdyCfg.driveEvents // Boolean
             };
             // if a pad is created from a file
             if (sessionStorage[Constants.newPadFileData]) {

www/common/outer/async-store.js

@@ -1232,6 +1232,23 @@ define([
             cb(res || viewRes || {});
         };
 
+        // Hidden hash: if a pad is deleted, we may have to switch back to full hash
+        // in some tabs
+        Store.checkDeletedPad = function (channel) {
+            if (!channel) { return; }
+
+            // Check if the pad is still stored in one of our drives
+            Store.getPadDataFromChannel(null, {
+                channel: channel,
+                isFile: true // we don't care if it's view or edit
+            }, function (res) {
+                // If it is stored, abort
+                if (Object.keys(res).length) { return; }
+                // Otherwise, tell all the tabs that this channel was deleted and give them the hrefs
+                broadcast([], "CHANNEL_DELETED", channel);
+            });
+        };
+
         // Messaging (manage friends from the userlist)
         Store.answerFriendRequest = function (clientId, obj, cb) {
             var value = obj.value;
@@ -2127,6 +2144,12 @@ define([
                         }
                     }
                 }
+                if (o && !n && Array.isArray(p) && (p[0] === UserObject.FILES_DATA ||
+                    (p[0] === 'drive' && p[1] === UserObject.FILES_DATA))) {
+                    setTimeout(function () {
+                        Store.checkDeletedPad(o && o.channel);
+                    });
+                }
                 sendDriveEvent('DRIVE_CHANGE', {
                     id: fId,
                     old: o,

www/common/outer/team.js

@@ -93,6 +93,12 @@ define([
                     }
                 }
             }
+            if (o && !n && Array.isArray(p) && (p[0] === UserObject.FILES_DATA ||
+                (p[0] === 'drive' && p[1] === UserObject.FILES_DATA))) {
+                setTimeout(function () {
+                    ctx.Store.checkDeletedPad(o && o.channel);
+                });
+            }
             team.sendEvent('DRIVE_CHANGE', {
                 id: fId,
                 old: o,

www/common/proxy-manager.js

@@ -771,6 +771,9 @@ define([
             toUnpin.forEach(function (chan) {
                 if (toKeep.indexOf(chan) === -1) {
                     unpinList.push(chan);
+
+                    // Check if need need to restore a full hash (hidden hash deleted from drive)
+                    Env.Store.checkDeletedPad(chan);
                 }
             });
 
@@ -783,7 +786,16 @@ define([
     };
     // Empty the trash (main drive only)
     var _emptyTrash = function (Env, data, cb) {
-        Env.user.userObject.emptyTrash(cb);
+        Env.user.userObject.emptyTrash(function (err, toClean) {
+            cb();
+
+            // Check if need need to restore a full hash (hidden hash deleted from drive)
+            if (!Array.isArray(toClean)) { return; }
+            var toCheck = Util.deduplicateString(toClean);
+            toCheck.forEach(function (chan) {
+                Env.Store.checkDeletedPad(chan);
+            });
+        });
     };
     // Rename files or folders
     var _rename = function (Env, data, cb) {

www/common/sframe-common-outer.js

@@ -1324,7 +1324,16 @@ define([
                 }
             } catch (e) {}
 
-
+            // If our channel was deleted from all of our drives, sitch back to full hash
+            // in the address bar
+            Cryptpad.padRpc.onChannelDeleted.reg(function (channel) {
+                if (channel !== secret.channel) { return; }
+                var ohc = window.onhashchange;
+                window.onhashchange = function () {};
+                window.location.href = currentPad.href;
+                window.onhashchange = ohc;
+                ohc({reset: true});
+            });
 
             // Join the netflux channel
             var rtStarted = false;