Change storage abstraction to use a new key

src/app/storage.js

@@ -6,20 +6,24 @@ function Storage () {
   }
 
   this.get = function (name) {
-    return window.localStorage.getItem(name)
+    return window.localStorage.getItem('sol:' + name)
   }
 
   this.set = function (name, content) {
-    window.localStorage.setItem(name, content)
+    window.localStorage.setItem('sol:' + name, content)
   }
 
-  this.keys = function () {
+  function safeKeys () {
     // NOTE: this is a workaround for some browsers
     return Object.keys(window.localStorage).filter(function (item) { return item !== null && item !== undefined })
   }
 
+  this.keys = function () {
+    return safeKeys().filter(function (item) { return item.replace('sol:', '') })
+  }
+
   this.remove = function (name) {
-    window.localStorage.removeItem(name)
+    window.localStorage.removeItem('sol:' + name)
   }
 
   this.rename = function (originalName, newName) {
@@ -36,6 +40,15 @@ function Storage () {
     }
     this.set(filename, content)
   }
+
+  // on startup, upgrade the old storage layout
+  safeKeys().forEach(function (name) {
+    if (name.indexOf('sol-cache-file-', 0) === 0) {
+      var content = window.localStorage.getItem(name)
+      window.localStorage.setItem('sol:' + name.replace('sol-cache-file-', ''), content)
+      window.localStorage.removeItem(name)
+    }
+  })
 }
 
 module.exports = Storage