string entropy check

main.js

@@ -288,8 +288,8 @@ function createWindow(status, hideLoadingWindow) {
 					firstLoginPH: null,
 					secondaryLoginPH: null,
 				};
-
 				mainWindow.nnVoteChain = 'VOTE2018';
+				mainWindow.checkStringEntropy = shepherd.checkStringEntropy;
 
 			  /*for (let i = 0; i < process.argv.length; i++) {
 			    if (process.argv[i].indexOf('nvote') > -1) {

package.json

@@ -48,6 +48,7 @@
     "js-sha256": "^0.7.1",
     "marketmaker": "git://github.com/pbca26/marketmaker",
     "nodejs-aes256": "^1.0.1",
+    "passwd-strength": "https://github.com/pbca26/passwd-strength",
     "portscanner": "^2.1.1",
     "ps-node": "^0.1.5",
     "remote-file-size": "^3.0.3",

routes/appConfig.js

@@ -71,7 +71,7 @@ const appConfig = {
     experimentalFeatures: {
       display: true,
       initDisplay: true,
-      displayName: 'Enable experimental features',
+      displayName: 'Enable advanced features',
       type: 'boolean',
     },
     dataDir: {

routes/shepherd/auth.js

@@ -1,3 +1,5 @@
+const passwdStrength = require('passwd-strength');
+
 module.exports = (shepherd) => {
   /*
    *  type: GET
@@ -43,5 +45,10 @@ module.exports = (shepherd) => {
     }
   };
 
+  shepherd.checkStringEntropy = (str) => {
+    // https://tools.ietf.org/html/rfc4086#page-35
+    return passwdStrength(str) < 29 ? false : true;
+  };
+
   return shepherd;
 };