added option *generateUserId* in abstract connector

src/Connector.js

@@ -59,6 +59,9 @@ module.exports = function (Y/* :any */) {
       this.protocolVersion = 11
       this.authInfo = opts.auth || null
       this.checkAuth = opts.checkAuth || function () { return Promise.resolve('write') } // default is everyone has write access
+      if (opts.generateUserId === true) {
+        this.setUserId(Y.utils.generateGuid())
+      }
     }
     resetAuth (auth) {
       if (this.authInfo !== auth) {

src/Utils.js

@@ -752,4 +752,9 @@ module.exports = function (Y /* : any*/) {
     return SmallLookupBuffer
   }
   Y.utils.createSmallLookupBuffer = createSmallLookupBuffer
+
+  // Generates a unique id, for use as a user id.
+  // Thx to @jed for this script https://gist.github.com/jed/982883
+  function generateGuid(a){return a?(a^Math.random()*16>>a/4).toString(16):([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g,generateGuid)} // eslint-disable-line
+  Y.utils.generateGuid = generateGuid
 }