Use NativeStorage plugin as backup for localStorage data #60

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "com.netsyms.packagehelper",
-  "version": "1.6.3",
+  "version": "1.6.4",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -620,6 +620,12 @@
       "integrity": "sha512-jPvcwDx2/L5ZbVG69NT2xmlG1E+MljRxkdsFpgj/5aoaF4oPqxg44J/bYxJNWgQtGnRSRWoqCRmU7FgmmMNMxA==",
       "dev": true
     },
+    "cordova-plugin-nativestorage": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/cordova-plugin-nativestorage/-/cordova-plugin-nativestorage-2.3.2.tgz",
+      "integrity": "sha512-olg/BzYRk0NGbKQ5f7rf21RYQEyJI19CCZn6RpVMO9/kbRRFqae/6ixjDNy81dXSu2TQ42brjBddGe1Qpn5ViA==",
+      "dev": true
+    },
     "cordova-plugin-powermanagement-netsyms": {
       "version": "git+https://source.netsyms.com/Netsyms/cordova-plugin-powermanagement#1cca6de3d8153b369cef147d7e1689272d0944f3",
       "from": "git+https://source.netsyms.com/Netsyms/cordova-plugin-powermanagement"

package.json

@@ -32,7 +32,8 @@
       "phonegap-plugin-barcodescanner": {
         "ANDROID_SUPPORT_V4_VERSION": "27.+"
       },
-      "cordova-plugin-velda-devicefeedback": {}
+      "cordova-plugin-velda-devicefeedback": {},
+      "cordova-plugin-nativestorage": {}
     },
     "platforms": [
       "browser",
@@ -51,6 +52,7 @@
   "devDependencies": {
     "cordova-ios": "^6.1.1",
     "cordova-plugin-inappbrowser": "^4.1.0",
+    "cordova-plugin-nativestorage": "^2.3.2",
     "cordova-plugin-velda-devicefeedback": "0.0.2",
     "phonegap-plugin-barcodescanner": "^8.1.0"
   }

www/assets/js/main.js

@@ -95,6 +95,24 @@ router.on("routeChange", function (newRoute) {
     console.log("Info", "Navigating to ", newRoute.path);
 });
 
+try {
+// Detect if localStorage is gone and try to restore it from NativeStorage plugin
+    if (getStorage("syncstateversion") == null || getStorage("syncstateversion") == 0) {
+        console.log("LocalStorage syncstateversion is null or zero, restoring from NativeStorage");
+        // "restore" localStorage
+        copyNativeStorageToLocalStorage();
+        // give it some arbitrary amount of time because I'm too lazy to do real async
+        setTimeout(function () {
+            loadSettings();
+        }, 60 * 1000);
+    } else {
+        // "back up" localStorage
+        copyLocalStorageToNativeStorage();
+    }
+} catch (ex) {
+    // Well we tried
+}
+
 // Set alert radius to 100 meters by default
 if (getStorage("alertradius") == null) {
     setStorage("alertradius", 100);
@@ -188,7 +206,6 @@ function setAnimations(enabled) {
     }
 }
 
-applyColorTheme();
-setAnimations();
+loadSettings();
 
 router.navigate("/home");

www/assets/js/settings.js

@@ -10,9 +10,10 @@ function logout() {
             "Are you sure you want to log out?",
             "Log out?",
             function () {
-                localStorage.removeItem('password');
-                localStorage.removeItem('username');
-                localStorage.removeItem('lastsync');
+                removeStorage('username');
+                removeStorage('password');
+                removeStorage('lastsync');
+                removeStorage('syncstateversion');
                 restartApplication();
             }
     );

www/assets/js/storage.js

@@ -17,6 +17,11 @@ function setStorage(key, value, nochangeupdate) {
         nochangeupdate = false;
     }
     localStorage.setItem(key, value);
+    try {
+        NativeStorage.setItem(key, value);
+    } catch (ex) {
+        // skip
+    }
     if (!nochangeupdate && !SETTINGS.synckeyblacklist.includes(key)) {
         var version = getStorage("syncstateversion") == null ? 0 : getStorage("syncstateversion");
         localStorage.setItem("syncstateversion", Number(version) + 1);
@@ -41,6 +46,15 @@ function inStorage(key) {
     return localStorage.getItem(key) != null;
 }
 
+/**
+ * Erase the key and its value from the persistent storage.
+ * @param {string} key
+ * @returns {undefined}
+ */
+function removeStorage(key) {
+    localStorage.removeItem(key);
+}
+
 /**
  * Get all item from persistent storage.
  * @returns {Array} [{key: "", value: ""},...]
@@ -57,3 +71,21 @@ function getAllStorage() {
     }
     return all;
 }
+
+function copyLocalStorageToNativeStorage() {
+    for (var key in localStorage) {
+        if (localStorage.hasOwnProperty(key)) {
+            NativeStorage.setItem(key, localStorage.getItem(key));
+        }
+    }
+}
+
+function copyNativeStorageToLocalStorage() {
+    NativeStorage.keys(function (keys) {
+        for (var key in keys) {
+            NativeStorage.getItem(key, function (val) {
+                localStorage.setItem(key, val);
+            });
+        }
+    });
+}

www/assets/js/sync.js

@@ -81,6 +81,7 @@ function syncNow(callback) {
 
 function loadSettings() {
     applyColorTheme();
+    setAnimations();
 
     if (platform_type == "cordova") {
         if (getStorage("wakelock") == "true") {