Add storage file

lib/renderer/extensions/storage.js

@@ -0,0 +1,59 @@
+
+const getStorage  = () => {
+  const data = window.localStorage.getItem('__chrome.storage.sync__')
+  if (data != null) {
+    return JSON.parse(data)
+  } else {
+    return {}
+  }
+}
+
+const setStorage = (storage) => {
+  const json = JSON.stringify(storage)
+  window.localStorage.setItem('__chrome.storage.sync__', json)
+}
+
+module.exports = {
+  sync: {
+    get (keys, callback) {
+      const storage = getStorage()
+
+      if (keys === {} || keys === []) return {}
+      if (keys === null) return storage
+
+      if (typeof keys === 'string') keys = [keys]
+
+      let items = {}
+      // ['foo'] or ['foo', 'bar'] or [{foo: 'bar'}]
+      keys.forEach(function (key) {
+        if (typeof key === 'string') {
+          items[key] = storage[key]
+        }
+        else {
+          const objKey = Object.keys(key)
+          if (!storage[objKey] || storage[objKey] === '') {
+            items[objKey] = key[objKey]
+          } else {
+            items[objKey] = storage[objKey]
+          }
+        }
+      })
+
+      setTimeout(function () {
+        callback(items)
+      })
+    },
+
+    set (items, callback) {
+      const storage = getStorage()
+
+      Object.keys(items).forEach(function (name) {
+        storage[name] = items[name]
+      })
+
+      setStorage(storage)
+
+      setTimeout(callback)
+    }
+  }
+}