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facebook-credentials.html
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<!DOCTYPE html>
<!--
Copyright (c) 2016 Google Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<html>
<head>
<meta charset=utf-8 />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Facebook Sign In Example</title>
<!-- Material Design Theming -->
<link rel="stylesheet" href="https://code.getmdl.io/1.1.3/material.orange-indigo.min.css">
<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
<script defer src="https://code.getmdl.io/1.1.3/material.min.js"></script>
<link rel="stylesheet" href="main.css">
</head>
<body>
<div class="demo-layout mdl-layout mdl-js-layout mdl-layout--fixed-header">
<!-- Header section containing title -->
<header class="mdl-layout__header mdl-color-text--white mdl-color--light-blue-700">
<div class="mdl-cell mdl-cell--12-col mdl-cell--12-col-tablet mdl-grid">
<div class="mdl-layout__header-row mdl-cell mdl-cell--12-col mdl-cell--12-col-tablet mdl-cell--8-col-desktop">
<a href="/"><h3>Firebase Authentication</h3></a>
</div>
</div>
</header>
<main class="mdl-layout__content mdl-color--grey-100">
<div class="mdl-cell mdl-cell--12-col mdl-cell--12-col-tablet mdl-grid">
<!-- Container for the demo -->
<div class="mdl-card mdl-shadow--2dp mdl-cell mdl-cell--12-col mdl-cell--12-col-tablet mdl-cell--12-col-desktop">
<div class="mdl-card__title mdl-color--light-blue-600 mdl-color-text--white">
<h2 class="mdl-card__title-text">Facebook Authentication with OAuth Credentials</h2>
</div>
<div class="mdl-card__supporting-text mdl-color-text--grey-600">
<p>Log in with your Facebook account below.</p>
<!-- [START facebook_button] -->
<fb:login-button data-auto-logout-link="true" scope="public_profile,email" size="large"></fb:login-button>
<!-- [END facebook_button] -->
<div class="quickstart-user-details-container">
Firebase sign-in status: <span id="quickstart-sign-in-status">Unknown</span>
<div>Firebase auth <code>currentUser</code> object value:</div>
<pre><code id="quickstart-account-details">null</code></pre>
</div>
</div>
</div>
</div>
</main>
</div>
<!-- Firebase -->
<!-- ***********************************************************************************************************************
* TODO(DEVELOPER): Paste the initialization snippet from: Firebase Console > Overview > Add Firebase to your web app. *
*********************************************************************************************************************** -->
<script type="text/javascript">
/**
* Function called when there is a change in Facebook auth state.
*/
// [START facebookcallback]
function checkLoginState(event) {
if (event.authResponse) {
// User is signed-in Facebook.
var unsubscribe = firebase.auth().onAuthStateChanged(function(firebaseUser) {
unsubscribe();
// Check if we are already signed-in Firebase with the correct user.
if (!isUserEqual(event.authResponse, firebaseUser)) {
// Build Firebase credential with the Facebook auth token.
// [START facebookcredential]
var credential = firebase.auth.FacebookAuthProvider.credential(
event.authResponse.accessToken);
// [END facebookcredential]
// Sign in with the credential from the Facebook user.
// [START authwithcred]
firebase.auth().signInWithCredential(credential).catch(function(error) {
// Handle Errors here.
var errorCode = error.code;
var errorMessage = error.message;
// The email of the user's account used.
var email = error.email;
// The firebase.auth.AuthCredential type that was used.
var credential = error.credential;
// [START_EXCLUDE]
if (errorCode === 'auth/account-exists-with-different-credential') {
alert('You have already signed up with a different auth provider for that email.');
// If you are using multiple auth providers on your app you should handle linking
// the user's accounts here.
} else {
console.error(error);
}
// [END_EXCLUDE]
});
// [END authwithcred]
} else {
// User is already signed-in Firebase with the correct user.
}
});
} else {
// User is signed-out of Facebook.
// [START signout]
firebase.auth().signOut();
// [END signout]
}
}
// [END facebookcallback]
/**
* Check that the given Facebook user is equals to the given Firebase user
*/
// [START checksameuser]
function isUserEqual(facebookAuthResponse, firebaseUser) {
if (firebaseUser) {
var providerData = firebaseUser.providerData;
for (var i = 0; i < providerData.length; i++) {
if (providerData[i].providerId === firebase.auth.FacebookAuthProvider.PROVIDER_ID &&
providerData[i].uid === facebookAuthResponse.userID) {
// We don't need to re-auth the Firebase connection.
return true;
}
}
}
return false;
}
// [END checksameuser]
/**
* initApp handles setting up UI event listeners and registering Firebase auth listeners:
* - firebase.auth().onAuthStateChanged: This listener is called when the user is signed in or
* out, and that is where we update the UI.
*/
function initApp() {
// Listening for auth state changes.
// [START authstatelistener]
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 isAnonymous = user.isAnonymous;
var uid = user.uid;
var providerData = user.providerData;
// [START_EXCLUDE]
document.getElementById('quickstart-sign-in-status').textContent = 'Signed in';
document.getElementById('quickstart-account-details').textContent = JSON.stringify(user, null, ' ');
// [END_EXCLUDE]
} else {
// User is signed out.
// [START_EXCLUDE]
document.getElementById('quickstart-sign-in-status').textContent = 'Signed out';
document.getElementById('quickstart-account-details').textContent = 'null';
// [END_EXCLUDE]
}
});
// [END authstatelistener]
}
initApp();
</script>
<!-- Facebook -->
<!-- [START facebookconfig] -->
<script src="//connect.facebook.net/en_US/sdk.js"></script>
<script>
FB.init({
/**********************************************************************
* TODO(Developer): Change the value below with your Facebook app ID. *
**********************************************************************/
appId : '<YOUR_FACEBOOK_APP_ID>',
status : true,
xfbml : true,
version : 'v2.6'
});
// [START_EXCLUDE silent]
// Observe the change in Facebook login status
// [START facebookauthlistener]
FB.Event.subscribe('auth.authResponseChange', checkLoginState);
// [END facebookauthlistener]
// [END_EXCLUDE]
</script>
<!-- [END facebookconfig] -->
</body>
</html>