add fallback localStorage implementation if not functional, #134

isso/js/app/isso.js

@@ -7,7 +7,8 @@ define(["app/dom", "app/utils", "app/config", "app/api", "app/jade", "app/i18n",
 
     var Postbox = function(parent) {
 
-        var el = $.htmlify(jade.render("postbox", {
+        var localStorage = utils.localStorageImpl,
+            el = $.htmlify(jade.render("postbox", {
             "author":  JSON.parse(localStorage.getItem("author")),
             "email":   JSON.parse(localStorage.getItem("email")),
             "website": JSON.parse(localStorage.getItem("website"))

isso/js/app/utils.js

@@ -68,11 +68,34 @@ define(["app/i18n"], function(i18n) {
                    .replace(/\n/gi, '<br>');
     };
 
+    // Safari private browsing mode supports localStorage, but throws QUOTA_EXCEEDED_ERR
+    var localStorageImpl;
+    try {
+        localStorage.setItem("x", "y");
+        localStorage.removeItem("x");
+        localStorageImpl = localStorage;
+    } catch (ex) {
+        localStorageImpl = (function(storage) {
+            return {
+                setItem: function(key, val) {
+                    storage[key] = val;
+                },
+                getItem: function(key) {
+                    return typeof(storage[key]) !== 'undefined' ? storage[key] : null;
+                },
+                removeItem: function(key) {
+                    delete storage[key];
+                }
+            };
+        })({});
+    }
+
     return {
         cookie: cookie,
         pad: pad,
         ago: ago,
         text: text,
-        detext: detext
+        detext: detext,
+        localStorageImpl: localStorageImpl
     };
 });