guard against QuotaExceeded DOMExceptions when writing to localStorage

www/common/LessLoader.js

@@ -37,7 +37,11 @@ define([
     var cachePut = function (k, v, cb) {
         if (window.cryptpadCache) { return void window.cryptpadCache.put(k, v, cb); }
         setTimeout(function () {
-            localStorage['LESS_CACHE|' + key + '|' + k] = v;
+            try {
+                localStorage['LESS_CACHE|' + key + '|' + k] = v;
+            } catch (err) {
+                console.error(err);
+            }
             if (cb) { cb(); }
         });
     };

www/common/outer/local-store.js

@@ -8,6 +8,14 @@ define([
 ], function (Constants, Hash, Cache, localForage, AppConfig, Util) {
     var LocalStore = {};
 
+    var safeSet = function (key, val) {
+        try {
+            localStorage.setItem(key, val);
+        } catch (err) {
+            console.error(err);
+        }
+    };
+
     LocalStore.setThumbnail = function (key, value, cb) {
         localForage.setItem(key, value, cb);
     };
@@ -21,7 +29,7 @@ define([
 
     LocalStore.setFSHash = function (hash) {
         var sHash = Hash.serializeHash(hash);
-        localStorage[Constants.fileHashKey] = sHash;
+        safeSet(Constants.fileHashKey, sHash);
     };
     LocalStore.getFSHash = function () {
         var hash = localStorage[Constants.fileHashKey];
@@ -33,7 +41,7 @@ define([
 
         if (hash) {
             var sHash = Hash.serializeHash(hash);
-            if (sHash !== hash) { localStorage[Constants.fileHashKey] = sHash; }
+            if (sHash !== hash) { safeSet(Constants.fileHashKey, sHash); }
         }
 
         return hash;
@@ -49,7 +57,7 @@ define([
 
         if (hash) {
             var sHash = Hash.serializeHash(hash);
-            if (sHash !== hash) { localStorage[Constants.userHashKey] = sHash; }
+            if (sHash !== hash) { safeSet(Constants.userHashKey, sHash); }
         }
 
         return hash;
@@ -57,7 +65,7 @@ define([
 
     LocalStore.setUserHash = function (hash) {
         var sHash = Hash.serializeHash(hash);
-        localStorage[Constants.userHashKey] = sHash;
+        safeSet(Constants.userHashKey, sHash);
     };
 
     LocalStore.getBlockHash = function () {
@@ -65,7 +73,7 @@ define([
     };
 
     LocalStore.setBlockHash = function (hash) {
-        localStorage[Constants.blockHashKey] = hash;
+        safeSet(Constants.blockHashKey, hash);
     };
 
     LocalStore.getAccountName = function () {
@@ -87,7 +95,7 @@ define([
     };
 
     LocalStore.setDriveRedirectPreference = function (bool) {
-        localStorage.setItem(Constants.redirectToDriveKey, Boolean(bool));
+        safeSet(Constants.redirectToDriveKey, Boolean(bool));
     };
 
     LocalStore.getPremium = function () {
@@ -96,15 +104,15 @@ define([
         } catch (err) { return; }
     };
     LocalStore.setPremium = function (bool) {
-        localStorage.setItem(Constants.isPremiumKey, Boolean(bool));
+        safeSet(Constants.isPremiumKey, Boolean(bool));
     };
 
     LocalStore.login = function (hash, name, cb) {
         if (!hash) { throw new Error('expected a user hash'); }
         if (!name) { throw new Error('expected a user name'); }
         hash = Hash.serializeHash(hash);
-        localStorage.setItem(Constants.userHashKey, hash);
-        localStorage.setItem(Constants.userNameKey, name);
+        safeSet(Constants.userHashKey, hash);
+        safeSet(Constants.userNameKey, name);
         if (cb) { cb(); }
     };
     var logoutHandlers = [];

www/common/sframe-common-outer.js

@@ -251,7 +251,11 @@ define([
 
             sframeChan.on('EV_CACHE_PUT', function (x) {
                 Object.keys(x).forEach(function (k) {
-                    localStorage['CRYPTPAD_CACHE|' + k] = x[k];
+                    try {
+                        localStorage['CRYPTPAD_CACHE|' + k] = x[k];
+                    } catch (err) {
+                        console.error(err);
+                    }
                 });
             });
             sframeChan.on('EV_LOCALSTORE_PUT', function (x) {
@@ -260,7 +264,11 @@ define([
                         delete localStorage['CRYPTPAD_STORE|' + k];
                         return;
                     }
-                    localStorage['CRYPTPAD_STORE|' + k] = x[k];
+                    try {
+                        localStorage['CRYPTPAD_STORE|' + k] = x[k];
+                    } catch (err) {
+                        console.error(err);
+                    }
                 });
             });
 
@@ -1859,7 +1867,11 @@ define([
                     if (isChrome && getChromeVersion() === 68) {
                         sframeChan.whenReg('EV_CHROME_68', function () {
                             sframeChan.event("EV_CHROME_68");
-                            localStorage.CryptPad_chrome68 = "1";
+                            try {
+                                localStorage.CryptPad_chrome68 = "1";
+                            } catch (err) {
+                                console.error(err);
+                            }
                         });
                     }
                 }

www/secureiframe/main.js

@@ -125,7 +125,11 @@ define([
 
                 sframeChan.on('EV_CACHE_PUT', function (x) {
                     Object.keys(x).forEach(function (k) {
-                        localStorage['CRYPTPAD_CACHE|' + k] = x[k];
+                        try {
+                            localStorage['CRYPTPAD_CACHE|' + k] = x[k];
+                        } catch (err) {
+                            console.error(err);
+                        }
                     });
                 });
                 sframeChan.on('EV_LOCALSTORE_PUT', function (x) {
@@ -134,7 +138,11 @@ define([
                             delete localStorage['CRYPTPAD_STORE|' + k];
                             return;
                         }
-                        localStorage['CRYPTPAD_STORE|' + k] = x[k];
+                        try {
+                            localStorage['CRYPTPAD_STORE|' + k] = x[k];
+                        } catch (err) {
+                            console.error(err);
+                        }
                     });
                 });