FirebaseUI is an open-source JavaScript library for Web that provides simple, customizable UI bindings on top of Firebase SDKs to eliminate boilerplate code and promote best practices.
JavaScript HTML CSS Other
Latest commit dffd851 Jan 6, 2017 @TMSCH TMSCH committed on GitHub Added documentation for uiShown callback. (#90)

README.md

Build Status

FirebaseUI for Web — Auth

FirebaseUI is an open-source JavaScript library for Web that provides simple, customizable UI bindings on top of Firebase SDKs to eliminate boilerplate code and promote best practices.

FirebaseUI Auth provides a drop-in auth solution that handles the UI flows for signing in users with email addresses and passwords, and Identity Provider Sign In using Google, Facebook and others. It is built on top of Firebase Auth.

The FirebaseUI component implements best practices for authentication on mobile devices and websites, helping to sign-in and sign-up conversion for your app. It also handles cases like account recovery and account linking that can be security sensitive and error-prone to handle.

FirebaseUI Auth clients are also available for iOS and Android.

FirebaseUI fully supports all recent browsers. Signing in with federated providers (Google, Facebook, Twitter, Github) is not yet supported in non-browser environments (Cordova, React Native, Ionic...) nor Chrome extensions.

Table of Contents

  1. Installation
  2. Usage instructions
  3. Configuration
  4. Customization
  5. Advanced
  6. Developer Setup
  7. Known issues
  8. Release Notes

Installation

CDN

You just need to include the following script and CSS file in the <head> tag of your page, below the initialization snippet from the Firebase Console:

<script src="https://cdn.firebase.com/libs/firebaseui/1.0.0/firebaseui.js"></script>
<link type="text/css" rel="stylesheet" href="https://cdn.firebase.com/libs/firebaseui/1.0.0/firebaseui.css" />

npm Module

Install FirebaseUI and its dependencies via npm using the following command:

$ npm install firebaseui --save

You can then require the following modules within your source files:

var firebase = require('firebase');
var firebaseui = require('firebaseui');

Or include the required files in your HTML, if your HTTP Server serves the files within node_modules/:

<script src="node_modules/firebaseui/dist/firebaseui.js"></script>
<link type="text/css" rel="stylesheet" href="node_modules/firebaseui/dist/firebaseui.css" />

Bower component

Install FirebaseUI and its dependencies via Bower using the following command:

$ bower install firebaseui --save

You can then include the required files in your HTML, if your HTTP Server serves the files within bower_components/:

<script src="bower_components/firebaseui/dist/firebaseui.js"></script>
<link type="text/css" rel="stylesheet" href="bower_components/firebaseui/dist/firebaseui.css" />

Using FirebaseUI for Authentication

FirebaseUI includes the following flows:

  1. Interaction with Identity Providers such as Google and Facebook
  2. Sign-up and sign-in with email accounts
  3. Password reset
  4. Prevention of account duplication (activated when "One account per email address" setting is enabled in the Firebase console. This setting is enabled by default.)
  5. Account Chooser for remembering emails

Configuring sign-in providers

To use FirebaseUI to authenticate users you first need to configure each provider you want to use in their own developer app settings. Please read the Before you begin section of Firebase Authentication at the following links:

Starting the sign-in flow

You first need to initialize your Firebase app. The firebase.auth.Auth instance should be passed to the constructor of firebaseui.auth.AuthUI. You can then call the start method with the CSS selector that determines where to create the widget, and a configuration object.

The following example shows how to set up a sign-in screen with all supported providers. Please refer to the demo application in the examples folder for a more in-depth example, showcasing a Single Page Application mode.

Firebase and FirebaseUI do not work when executed directly from a file (i.e. opening the file in your browser, not through a web server). Always run firebase serve (or your preferred local server) to test your app locally.

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Sample FirebaseUI App</title>
    <!-- *******************************************************************************************
       * TODO(DEVELOPER): Paste the initialization snippet from:
       * Firebase Console > Overview > Add Firebase to your web app. *
       ***************************************************************************************** -->
    <script src="https://cdn.firebase.com/libs/firebaseui/1.0.0/firebaseui.js"></script>
    <link type="text/css" rel="stylesheet" href="https://cdn.firebase.com/libs/firebaseui/1.0.0/firebaseui.css" />
    <script type="text/javascript">
      // FirebaseUI config.
      var uiConfig = {
        signInSuccessUrl: '<url-to-redirect-to-on-success>',
        signInOptions: [
          // Leave the lines as is for the providers you want to offer your users.
          firebase.auth.GoogleAuthProvider.PROVIDER_ID,
          firebase.auth.FacebookAuthProvider.PROVIDER_ID,
          firebase.auth.TwitterAuthProvider.PROVIDER_ID,
          firebase.auth.GithubAuthProvider.PROVIDER_ID,
          firebase.auth.EmailAuthProvider.PROVIDER_ID
        ],
        // Terms of service url.
        tosUrl: '<your-tos-url>'
      };

      // Initialize the FirebaseUI Widget using Firebase.
      var ui = new firebaseui.auth.AuthUI(firebase.auth());
      // The start method will wait until the DOM is loaded.
      ui.start('#firebaseui-auth-container', uiConfig);
    </script>
  </head>
  <body>
    <!-- The surrounding HTML is left untouched by FirebaseUI.
         Your app may use that space for branding, controls and other customizations.-->
    <h1>Welcome to My Awesome App</h1>
    <div id="firebaseui-auth-container"></div>
  </body>
</html>

Here is how you would track the Auth state across all your pages:

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Sample FirebaseUI App</title>
    <!-- *******************************************************************************************
       * TODO(DEVELOPER): Paste the initialization snippet from:
       * Firebase Console > Overview > Add Firebase to your web app. *
       ***************************************************************************************** -->
    <script type="text/javascript">
      initApp = function() {
        firebase.auth().onAuthStateChanged(function(user) {
          if (user) {
            // User is signed in.
            var displayName = user.displayName;
            var email = user.email;
            var emailVerified = user.emailVerified;
            var photoURL = user.photoURL;
            var uid = user.uid;
            var providerData = user.providerData;
            user.getToken().then(function(accessToken) {
              document.getElementById('sign-in-status').textContent = 'Signed in';
              document.getElementById('sign-in').textContent = 'Sign out';
              document.getElementById('account-details').textContent = JSON.stringify({
                displayName: displayName,
                email: email,
                emailVerified: emailVerified,
                photoURL: photoURL,
                uid: uid,
                accessToken: accessToken,
                providerData: providerData
              }, null, '  ');
            });
          } else {
            // User is signed out.
            document.getElementById('sign-in-status').textContent = 'Signed out';
            document.getElementById('sign-in').textContent = 'Sign in';
            document.getElementById('account-details').textContent = 'null';
          }
        }, function(error) {
          console.log(error);
        });
      };

      window.addEventListener('load', function() {
        initApp()
      });
    </script>
  </head>
  <body>
    <h1>Welcome to My Awesome App</h1>
    <div id="sign-in-status"></div>
    <div id="sign-in"></div>
    <div id="account-details"></div>
  </body>
</html>

Configuration

FirebaseUI supports the following configuration parameters.

Name Required Description
callbacks No A list of developers callbacks after specific events.
Default: []
credentialHelper No The Credential Helper to use. See Credential Helper.
Default: firebaseui.auth.CredentialHelper.ACCOUNT_CHOOSER_COM
queryParameterForSignInSuccessUrl No The redirect URL parameter name for the sign-in success URL. See Overwriting the sign-in success URL.
Default: "signInSuccessUrl"
queryParameterForWidgetMode No The redirect URL parameter name for the “mode” of the Widget. See FirebaseUI widget modes.
Default: "mode"
signInFlow No The sign-in flow to use for IDP providers: redirect or popup.
Default: "redirect"
signInOptions Yes The list of providers enabled for signing into your app. The order you specify them will be the order they are displayed on the sign-in provider selection screen.
signInSuccessUrl No The URL where to redirect the user after a successful sign-in. Required when the signInSuccess callback is not used or when it returns true.
tosUrl Yes The URL of the Terms of Service page.

Credential Helper

The role of a credential helper is to help your users sign into you website. When one is enabled, your users will be prompted with email addresses and usernames they have saved from your app or other applications. To achieve this, accountchooser.com is available. Upon signing in or signing up with email, the user will be redirected to the accountchooser.com website and will be able to select one of their saved accounts. It is recommended to use this, but you can also disable it by specifying the value below.

Credential Helper Value
accountchooser.com firebaseui.auth.CredentialHelper.ACCOUNT_CHOOSER_COM
None (disable) firebaseui.auth.CredentialHelper.NONE

Available providers

Provider Value
Google firebase.auth.GoogleAuthProvider.PROVIDER_ID
Facebook firebase.auth.FacebookAuthProvider.PROVIDER_ID
Twitter firebase.auth.TwitterAuthProvider.PROVIDER_ID
Github firebase.auth.GithubAuthProvider.PROVIDER_ID
Email and password firebase.auth.EmailAuthProvider.PROVIDER_ID

Custom scopes

To specify custom scopes per provider, you can pass an object instead of just the provider value:

ui.start('#firebaseui-auth-container', {
  signInOptions = [
    {
      provider: firebase.auth.GoogleAuthProvider.PROVIDER_ID,
      scopes: [
        'https://www.googleapis.com/auth/plus.login'
      ]
    },
    {
      provider: firebase.auth.FacebookAuthProvider.PROVIDER_ID,
      scopes: [
        'public_profile',
        'email',
        'user_likes',
        'user_friends'
      ]
    },
    firebase.auth.TwitterAuthProvider.PROVIDER_ID, // Twitter does not support scopes.
    firebase.auth.EmailAuthProvider.PROVIDER_ID // Other providers don't need to be given as object.
  ]
});

Sign In Flows

Two sign in flows are available:

  • redirect, the default, will perform a full page redirect to the sign-in page of the provider (Google, Facebook...). This is recommended for mobile apps.
  • The popup flow will open a popup to the sign-in page of the provider. If the popup is blocked by the browser, it will fall back to a full page redirect.

Available callbacks

signInSuccess(currentUser, credential, redirectUrl)

Parameters:

Name Type Optional Description
currentUser firebase.User No The logged in user.
credential firebase.auth.AuthCredential Yes The credential used to sign in the user.
redirectUrl string Yes The URL where the user is redirected after the callback finishes. It will only be given if you overwrite the sign-in success URL.

Should return: boolean

If the callback returns true, then the page is automatically redirected depending on the case:

  • If no signInSuccessUrl parameter was given in the URL (See: Overwriting the sign-in success URL) then the default signInSuccessUrl in config is used.
  • If the value is provided in the URL, that value will be used instead of the static signInSuccessUrl in config.

If the callback returns false or nothing, the page is not automatically redirected.

uiShown()

This callback is triggered the first time the widget UI is rendered. This is useful for cases where the application should display a custom loader before FirebaseUI is displayed.

Example with all parameters used

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Sample FirebaseUI App</title>
    <!-- *******************************************************************************************
       * TODO(DEVELOPER): Paste the initialization snippet from:
       * Firebase Console > Overview > Add Firebase to your web app. *
       ***************************************************************************************** -->
    <script src="https://cdn.firebase.com/libs/firebaseui/1.0.0/firebaseui.js"></script>
    <link type="text/css" rel="stylesheet" href="https://cdn.firebase.com/libs/firebaseui/1.0.0/firebaseui.css" />
    <script type="text/javascript">
      // FirebaseUI config.
      var uiConfig = {
        callbacks: {
          signInSuccess: function(currentUser, credential, redirectUrl) {
            // Do something.
            // Return type determines whether we continue the redirect automatically
            // or whether we leave that to developer to handle.
            return true;
          },
          uiShown: function() {
            // The widget is rendered.
            // Hide the loader.
            document.getElementById('loader').style.display = 'none';
          }
        },
        credentialHelper: firebaseui.auth.CredentialHelper.ACCOUNT_CHOOSER_COM,
        // Query parameter name for mode.
        queryParameterForWidgetMode: 'mode',
        // Query parameter name for sign in success url.
        queryParameterForSignInSuccessUrl: 'signInSuccessUrl',
        // Will use popup for IDP Providers sign-in flow instead of the default, redirect.
        signInFlow: 'popup',
        signInSuccessUrl: '<url-to-redirect-to-on-success>',
        signInOptions: [
          // Leave the lines as is for the providers you want to offer your users.
          firebase.auth.GoogleAuthProvider.PROVIDER_ID,
          firebase.auth.FacebookAuthProvider.PROVIDER_ID,
          firebase.auth.TwitterAuthProvider.PROVIDER_ID,
          firebase.auth.EmailAuthProvider.PROVIDER_ID
        ],
        // Terms of service url.
        tosUrl: '<your-tos-url>'
      };

      var ui = new firebaseui.auth.AuthUI(firebase.auth());
      // The start method will wait until the DOM is loaded.
      ui.start('#firebaseui-auth-container', uiConfig);
    </script>
  </head>
  <body>
    <!-- The surrounding HTML is left untouched by FirebaseUI.
         Your app may use that space for branding, controls and other customizations.-->
    <h1>Welcome to My Awesome App</h1>
    <div id="firebaseui-auth-container"></div>
    <div id="loader">Loading...</div>
  </body>
</html>

Customizing FirebaseUI for authentication

Currently, FirebaseUI does not offer customization out of the box. However, the HTML around the widget is not affected by it so you can display everything you want around the widget container.

Advanced

FirebaseUI widget modes

Upon initialization, FirebaseUI will look for the mode parameter in the URL. Depending on the value of this parameter, it will trigger a specific mode. When no mode parameter is found, it will default to the sign-in mode.

You can change the name of this parameter with the queryParameterForWidgetMode configuration parameter.

Query parameter value Description
?mode=select Sign-in mode

Example:

https://<url-of-the-widget>?mode=select

Overwriting the sign-in success URL

You can pass a query parameter to the widget's URL that will overwrite the URL the user is redirected to after a successful sign-in. If you do so, you must set the configuration signInSuccessUrl value (even if it will be overwritten). When passing the redirect URL this way, the signInSuccess callback will receive the value as the redirectUrl argument.

You must include the mode explicitly in the URL when using the signInSuccessUrl parameter, otherwise FirebaseUI will directly redirect to the URL specified.

You can change the name of this parameter with the queryParameterForSignInSuccessUrl configuration parameter.

Example:

https://<url-of-the-widget>?mode=select&signInSuccessUrl=signedIn.html will redirect the user to https://<url-of-the-widget>/signedIn.html after a successful sign-in flow.

Developer Setup

Dependencies

To set up a development environment to build FirebaseUI from source, you must have the following installed:

  • Node.js (>= 6.0.0)
  • npm (should be included with Node.js)
  • Java Runtime Environment

In order to run the demo and tests, you must also have:

  • Python (2.7)

Download the FirebaseUI source and its dependencies with:

git clone https://github.com/firebase/firebaseui-web.git
cd firebaseui-web
npm install

Building FirebaseUI

To build the library, run:

npm run build

This will create output files in the dist/ folder.

Running the demo app

To run the demo app, you must have a Firebase project set up on the Firebase Console. Copy demo/public/sample-config.js to demo/public/config.js:

cp demo/public/sample-config.js demo/public/config.js

Copy the data from the "Add Firebase to your web app" flow in Firebase Console. Next, run

npm run demo

This will start a local server serving a FirebaseUI demo app with all local changes. More details can be found in the demo app folder, covering how to configure the app to be deployed on a Firebase Hosting instance.

Running unit tests.

All unit tests can be run on the command line (via PhantomJS) with:

npm test

Alternatively, the unit tests can be run manually by running

npm run serve

Then, all unit tests can be run at: http://localhost:4000/buildtools/all_tests.html You can also run tests individually by accessing each HTML file under generated/tests, for example: http://localhost:4000/generated/tests/javascript/widgets/authui_test.html

Known issues

Firebase Auth does not work in Safari private browsing

When a user has enabled the private browsing mode in Safari, the web storage is disabled. This currently results in an error being thrown upon Firebase Auth initialization. Therefore, when following the snippets above, FirebaseUI will never get initialized and no UI will be displayed.

Tips for Single Page apps (UI Widget is already rendered on the page warning)

When re-rendering the FirebaseUI Auth widget (for instance after signing in a user, signing her out and trying to sign her in again), it will sometimes log a warning:

UI Widget is already rendered on the page and is pending some user interaction. Only one widget instance can be rendered per page. The previous instance has been automatically reset.

This happens when the UI widget was in a pending state, i.e. the user was in the middle of performing a sign-in flow. You should generally avoid re-rendering the widget in the middle of an action, but if you do, to avoid the warning, you should use the reset() method before re-rendering the widget.

Release Notes

1.0.0

See the milestone 1.0.0 for the issues covered in this release. Below is a summary of the most important ones:

  • FirebaseUI is now open source! To contribute, please first create an issue describing either the bug observed or the feature requested. This way we can discuss the relevance of the feature, before you start working on it. It is also usually better to express the bug before working on a fix.
  • Added an option to disable Account Chooser. See: Credential Helper.

0.5.0

See the milestone 0.5.0 for the issues covered in this release. Below is a summary of the most important ones:

  • FirebaseUI now supports Single Page Application: a reset method was added to allow to dispose of the widget. When the user leaves a page where the FirebaseUI widget was rendered (for instance in the componentWillUnmount method of a React component), call the reset method of the firebaseui.auth.AuthUI instance you created. Also, call the reset method before rendering again the widget if one has already been rendered on the page. Please refer to the demo app for guidance on how to use FirebaseUI in a Single Page Application context.
  • Custom scopes can now be added for each provider. See Custom Scopes.
  • Several issues, different but related to the displayName not being present after sign up with email and password, have been fixed.
  • A new config parameter has been added: signInFlow. It allows to specify whether the Identity Providers sign in flows should be done through redirect (the default) or popup. See Sign In Flows.