Merge pull request #5974 from electron/chrome-storage-sync

Add chrome.storage.sync and chrome.storage.get APIs

lib/renderer/chrome-api.js

@@ -183,12 +183,7 @@ exports.injectTo = function (extensionId, isBackgroundPage, context) {
     onMessage: chrome.runtime.onMessage
   }
 
-  chrome.storage = {
-    sync: {
-      get () {},
-      set () {}
-    }
-  }
+  chrome.storage = require('./extensions/storage.js')
 
   chrome.pageAction = {
     show () {},

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 == null) return storage
+
+      let defaults = {}
+      switch (typeof keys) {
+        case 'string':
+          keys = [keys]
+          break
+        case 'object':
+          if (!Array.isArray(keys)) {
+            defaults = keys
+            keys = Object.keys(keys)
+          }
+          break
+      }
+      if (keys.length === 0) return {}
+
+      let items = {}
+      keys.forEach(function (key) {
+        var value = storage[key]
+        if (value == null) value = defaults[key]
+        items[key] = value
+      })
+
+      setTimeout(function () {
+        callback(items)
+      })
+    },
+
+    set (items, callback) {
+      const storage = getStorage()
+
+      Object.keys(items).forEach(function (name) {
+        storage[name] = items[name]
+      })
+
+      setStorage(storage)
+
+      setTimeout(callback)
+    }
+  }
+}