refactor file structure

browser/lib/clientKey.js

@@ -0,0 +1,23 @@
+import _ from 'lodash'
+import keygen from 'boost/keygen'
+
+function getClientKey () {
+  let clientKey = localStorage.getItem('clientKey')
+  if (!_.isString(clientKey) || clientKey.length !== 40) {
+    clientKey = keygen()
+    setClientKey(clientKey)
+  }
+
+  return clientKey
+}
+
+function setClientKey (newKey) {
+  localStorage.setItem('clientKey', newKey)
+}
+
+getClientKey()
+
+export default {
+  get: getClientKey,
+  set: setClientKey
+}