Added isAuthenticate to differentiate between ineligible messages

app/assets/javascripts/u2f/authenticate.js.es6

@@ -57,7 +57,7 @@
         return function(response) {
           var error;
           if (response.errorCode) {
-            error = new U2FError(response.errorCode);
+            error = new U2FError(response.errorCode, 'authenticate');
             return _this.renderError(error);
           } else {
             return _this.renderAuthenticated(JSON.stringify(response));

app/assets/javascripts/u2f/error.js

@@ -5,21 +5,21 @@
   var bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };
 
   this.U2FError = (function() {
-    function U2FError(errorCode) {
+    function U2FError(errorCode, u2fFlowType) {
       this.errorCode = errorCode;
       this.message = bind(this.message, this);
       this.httpsDisabled = window.location.protocol !== 'https:';
+      this.u2fFlowType = u2fFlowType;
     }
 
     U2FError.prototype.message = function() {
-      switch (false) {
-        case !(this.errorCode === u2f.ErrorCodes.BAD_REQUEST && this.httpsDisabled):
-          return "U2F only works with HTTPS-enabled websites. Contact your administrator for more details.";
-        case this.errorCode !== u2f.ErrorCodes.DEVICE_INELIGIBLE:
-          return "This device has already been registered with us.";
-        default:
-          return "There was a problem communicating with your device.";
+      if (this.errorCode === u2f.ErrorCodes.BAD_REQUEST && this.httpsDisabled) {
+        return 'U2F only works with HTTPS-enabled websites. Contact your administrator for more details.';
+      } else if (this.errorCode === u2f.ErrorCodes.DEVICE_INELIGIBLE) {
+        if (this.u2fFlowType === 'authenticate') return 'This device has not been registered with us.';
+        if (this.u2fFlowType === 'register') return 'This device has already been registered with us.';
       }
+      return "There was a problem communicating with your device.";
     };
 
     return U2FError;

app/assets/javascripts/u2f/register.js

@@ -39,7 +39,7 @@
         return function(response) {
           var error;
           if (response.errorCode) {
-            error = new U2FError(response.errorCode);
+            error = new U2FError(response.errorCode, 'register');
             return _this.renderError(error);
           } else {
             return _this.renderRegistered(JSON.stringify(response));