An option to hide username in signup view

README.md

@@ -346,6 +346,7 @@ var options = {
 - **prefill {Object}**: Allows you to set the initial value for the _email_ and/or _username_ inputs, e.g. `{prefill: {email: "someone@auth0.com", username: "someone"}}`. When omitted no initial value will be provided.
 - **signUpLink {String}**: URL for a page that allows the user to sign up. When set to a non-empty string, the user will be linked to the provided URL when clicking the _sign up_ tab in the _login screen_.
 - **usernameStyle {String}**: Determines what will be used to identify the user for a Database connection that has the `requires_username` flag set, otherwise it will be ignored. Possible values are `"username"` and `"email"` and by default both `username` and `email` are allowed.
+- **signUpHideUsernameField {Boolean}**: When set to `true` hides the _username_ input during sign up for a Database connection that has the `requires_username` flag set. Defaults to `false`.
 
 #### Enterprise options
 

src/__tests__/engine/classic/__snapshots__/sign_up_pane.test.jsx.snap

@@ -1,5 +1,22 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`SignUpPane onlyEmail is false hide UsernamePane when databaseConnectionRequiresUsername is true and signUpHideUsernameField is true 1`] = `
+<div>
+  <div
+    data-__type="email_pane"
+    data-i18n={
+      Object {
+        "html": [Function],
+        "str": [Function],
+      }
+    }
+    data-lock="model"
+    data-placeholder="emailInputPlaceholder"
+    data-strictValidation={true}
+  />
+</div>
+`;
+
 exports[`SignUpPane onlyEmail is false shows PasswordPane 1`] = `
 <div>
   <div
@@ -30,7 +47,7 @@ exports[`SignUpPane onlyEmail is false shows PasswordPane 1`] = `
 </div>
 `;
 
-exports[`SignUpPane onlyEmail is false shows UsernamePane when databaseConnectionRequiresUsername is true 1`] = `
+exports[`SignUpPane onlyEmail is false shows UsernamePane when databaseConnectionRequiresUsername is true and signUpHideUsernameField is false 1`] = `
 <div>
   <div
     data-__type="email_pane"

src/__tests__/engine/classic/sign_up_pane.test.jsx

@@ -59,11 +59,19 @@ describe('SignUpPane', () => {
 
       expectComponent(<Component {...defaultProps} onlyEmail={false} />).toMatchSnapshot();
     });
-    it('shows UsernamePane when databaseConnectionRequiresUsername is true', () => {
+    it('shows UsernamePane when databaseConnectionRequiresUsername is true and signUpHideUsernameField is false', () => {
       require('connection/database/index').databaseConnectionRequiresUsername = () => true;
+      require('connection/database/index').signUpHideUsernameField = () => false;
       const Component = getComponent();
 
       expectComponent(<Component {...defaultProps} onlyEmail={false} />).toMatchSnapshot();
     });
+    it('hide UsernamePane when databaseConnectionRequiresUsername is true and signUpHideUsernameField is true', () => {
+      require('connection/database/index').databaseConnectionRequiresUsername = () => true;
+      require('connection/database/index').signUpHideUsernameField = () => true;
+      const Component = getComponent();
+
+      expectComponent(<Component {...defaultProps} />).toMatchSnapshot();
+    });
   });
 });

src/connection/database/actions.js

@@ -5,14 +5,16 @@ import { closeLock, logIn as coreLogIn, logInSuccess, validateAndSubmit } from '
 import * as l from '../../core/index';
 import * as c from '../../field/index';
 import {
+  databaseConnection,
   databaseConnectionName,
   databaseConnectionRequiresUsername,
   databaseLogInWithEmail,
   hasScreen,
   setScreen,
   shouldAutoLogin,
   toggleTermsAcceptance as internalToggleTermsAcceptance,
-  additionalSignUpFields
+  additionalSignUpFields,
+  signUpHideUsernameField
 } from './index';
 import * as i18n from '../../i18n';
 
@@ -53,10 +55,24 @@ export function logIn(id, needsMFA = false) {
   });
 }
 
+function generateRandomUsername(length) {
+  let result = '';
+  const characters = 'abcdefghijklmnopqrstuvwxyz0123456789';
+  const charactersLength = characters.length;
+  for (let i = 0; i < length; i++) {
+    result += characters.charAt(Math.floor(Math.random() * charactersLength));
+  }
+  return result;
+}
+
 export function signUp(id) {
   const m = read(getEntity, 'lock', id);
   const fields = ['email', 'password'];
-  if (databaseConnectionRequiresUsername(m)) fields.push('username');
+
+  // Skip the username validation if signUpHideUsernameField option is enabled.
+  // We will generate a random username to avoid name collusion before we make the signup API call.
+  if (databaseConnectionRequiresUsername(m) && !signUpHideUsernameField(m)) fields.push('username');
+
   additionalSignUpFields(m).forEach(x => fields.push(x.get('name')));
 
   validateAndSubmit(id, fields, m => {
@@ -73,7 +89,13 @@ export function signUp(id) {
     }
 
     if (databaseConnectionRequiresUsername(m)) {
-      params.username = c.getFieldValue(m, 'username');
+      if (signUpHideUsernameField(m)) {
+        const usernameValidation = databaseConnection(m).getIn(['validation', 'username']);
+        const range = usernameValidation ? usernameValidation.toJS() : { max: 15 };
+        params.username = generateRandomUsername(range.max);
+      } else {
+        params.username = c.getFieldValue(m, 'username');
+      }
     }
 
     if (!additionalSignUpFields(m).isEmpty()) {

src/connection/database/index.js

@@ -63,7 +63,8 @@ function processDatabaseOptions(opts) {
     showTerms,
     signUpLink,
     usernameStyle,
-    signUpFieldsStrictValidation
+    signUpFieldsStrictValidation,
+    signUpHideUsernameField
   } = opts;
 
   let { initialScreen, screens } = processScreenOptions(opts);
@@ -96,6 +97,10 @@ function processDatabaseOptions(opts) {
     signUpFieldsStrictValidation = false;
   }
 
+  if (!assertMaybeBoolean(opts, 'signUpHideUsernameField')) {
+    signUpHideUsernameField = false;
+  }
+
   if (!assertMaybeArray(opts, 'additionalSignUpFields')) {
     additionalSignUpFields = undefined;
   } else if (additionalSignUpFields) {
@@ -259,7 +264,8 @@ function processDatabaseOptions(opts) {
     screens,
     signUpLink,
     usernameStyle,
-    signUpFieldsStrictValidation
+    signUpFieldsStrictValidation,
+    signUpHideUsernameField
   })
     .filter(x => typeof x !== 'undefined')
     .toJS();
@@ -456,6 +462,10 @@ export function signUpFieldsStrictValidation(m) {
   return get(m, 'signUpFieldsStrictValidation', false);
 }
 
+export function signUpHideUsernameField(m) {
+  return get(m, 'signUpHideUsernameField', false);
+}
+
 export function mustAcceptTerms(m) {
   return get(m, 'mustAcceptTerms', false);
 }

src/engine/classic/sign_up_pane.jsx

@@ -7,7 +7,8 @@ import {
   additionalSignUpFields,
   databaseConnectionRequiresUsername,
   passwordStrengthPolicy,
-  signUpFieldsStrictValidation
+  signUpFieldsStrictValidation,
+  signUpHideUsernameField
 } from '../../connection/database/index';
 import CaptchaPane from '../../field/captcha/captcha_pane';
 import * as l from '../../core/index';
@@ -30,7 +31,7 @@ export default class SignUpPane extends React.Component {
     const header = headerText && <p>{headerText}</p>;
 
     const usernamePane =
-      !onlyEmail && databaseConnectionRequiresUsername(model) ? (
+      !onlyEmail && databaseConnectionRequiresUsername(model) && !signUpHideUsernameField(model) ? (
         <UsernamePane
           i18n={i18n}
           lock={model}