Introduction
In this article, I’m going to share how to get user information from Facebook by submitting a token with PHP SDK, which is got by providing user a login page with JaveScript code.
Go to FB develop page, and sign up, and then go to console and add a new application
In the user information, copy App key and App secret
Create a Laravel project
laravel new Facebook
Initiate Git
git init
Install Facebook PHP SDK
- Under the project
composer require facebook/graph-sdk
Create a controller which we could interact with FB later with
php artisan make:controller FBController
Create a function called getFacebookResources
- Copy the SDK example code in its page, and paste it in the function
require_once __DIR__ . '/vendor/autoload.php'; // change path as needed
$fb = new \Facebook\Facebook([
'app_id' => '{app-id}',
'app_secret' => '{app-secret}',
'default_graph_version' => 'v2.10',
//'default_access_token' => '{access-token}', // optional
]);
// Use one of the helper classes to get a Facebook\Authentication\AccessToken entity.
// $helper = $fb->getRedirectLoginHelper();
// $helper = $fb->getJavaScriptHelper();
// $helper = $fb->getCanvasHelper();
// $helper = $fb->getPageTabHelper();
try {
// Get the \Facebook\GraphNodes\GraphUser object for the current user.
// If you provided a 'default_access_token', the '{access-token}' is optional.
$response = $fb->get('/me', '{access-token}');
} catch(\Facebook\Exceptions\FacebookResponseException $e) {
// When Graph returns an error
echo 'Graph returned an error: ' . $e->getMessage();
exit;
} catch(\Facebook\Exceptions\FacebookSDKException $e) {
// When validation fails or other local issues
echo 'Facebook SDK returned an error: ' . $e->getMessage();
exit;
}
$me = $response->getGraphUser();
echo 'Logged in as ' . $me->getName();
Enter App key and App secret
- In the example above, we need to fill in some area with some information got from FB developer account as follows:
$fb = new \Facebook\Facebook([
'app_id' => 'App Key',
'app_secret' => 'App Secret',
'default_graph_version' => 'Current version',
//'default_access_token' => '{access-token}', // optional
]);
Create a user login button
- User need to login in and get the token, and then we could use the token for further processing.
In routes/web.php file, create a route for the login page
Route::get('/FBToken', function(){
return view('FBToken');
});Under resources/views folder, create a php file called
FBtoken.blade, and paste the example code of JS as follows:<!DOCTYPE html>
<html>
<head>
<title>Facebook Login JavaScript Example</title>
<meta charset="UTF-8">
</head>
<body>
<script>
// This is called with the results from from FB.getLoginStatus().
function statusChangeCallback(response) {
console.log('statusChangeCallback');
console.log(response);
// The response object is returned with a status field that lets the
// app know the current login status of the person.
// Full docs on the response object can be found in the documentation
// for FB.getLoginStatus().
if (response.status === 'connected') {
// Logged into your app and Facebook.
testAPI();
} else {
// The person is not logged into your app or we are unable to tell.
document.getElementById('status').innerHTML = 'Please log ' +
'into this app.';
}
}
// This function is called when someone finishes with the Login
// Button. See the onlogin handler attached to it in the sample
// code below.
function checkLoginState() {
FB.getLoginStatus(function(response) {
statusChangeCallback(response);
});
}
window.fbAsyncInit = function() {
FB.init({
appId : '{your-app-id}',
cookie : true, // enable cookies to allow the server to access
// the session
xfbml : true, // parse social plugins on this page
version : '{api-version}' // The Graph API version to use for the call
});
// Now that we've initialized the JavaScript SDK, we call
// FB.getLoginStatus(). This function gets the state of the
// person visiting this page and can return one of three states to
// the callback you provide. They can be:
//
// 1. Logged into your app ('connected')
// 2. Logged into Facebook, but not your app ('not_authorized')
// 3. Not logged into Facebook and can't tell if they are logged into
// your app or not.
//
// These three cases are handled in the callback function.
FB.getLoginStatus(function(response) {
statusChangeCallback(response);
});
};
// Load the SDK asynchronously
(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "https://connect.facebook.net/en_US/sdk.js";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
// Here we run a very simple test of the Graph API after login is
// successful. See statusChangeCallback() for when this call is made.
function testAPI() {
console.log('Welcome! Fetching your information.... ');
FB.api('/me', function(response) {
console.log('Successful login for: ' + response.name);
document.getElementById('status').innerHTML =
'Thanks for logging in, ' + response.name + '!';
});
}
</script>
<!--
Below we include the Login Button social plugin. This button uses
the JavaScript SDK to present a graphical Login button that triggers
the FB.login() function when clicked.
-->
<fb:login-button scope="public_profile,email" onlogin="checkLoginState();">
</fb:login-button>
<div id="status">
</div>
</body>
</html>Same here, we need to fill in
App keyandcurrent versionthere as follows:FB.init({
appId : 'App key',
cookie : true, // enable cookies to allow the server to access
// the session
xfbml : true, // parse social plugins on this page
version : 'version' // The Graph API version to use for the call
});
Familiar yourself with FB Graph API tool
- We could we the API we need with FB Graph API tool
Customize endpoint
Because we might specify our endpoint simply by copying and pasting as follows:
So we could move endpoint to
.envas follows:$endpoint = env('FBEndpoint');
try
{
// Get the \Facebook\GraphNodes\GraphUser object for the current user.
// If you provided a 'default_access_token', the '{access-token}' is optional.
$response = $fb->get($endpoint, $token);And then in the
.envFBEndpoint=me?fields=id,name,email
So, in the future, we could simply copy the endpoint from FB, and paste it on
.env
Revise the error return
- In the default setting of PHP SDK, it would return error message according to the situation, which might be good. However, I only need to know true or false, and that’s it. A ineffective token might be caused by several factors as follows:
- It doesn’t exist
- Wrong token
- It expired
- It doesn’t matter which one it is, the only thing we have to do is inform front end of this matter, and ask them to provide make a request to FB again and provide the valid token to us. Therefore, we need to determine what we are going to by a simple true or false feedback from FB PHP SDK, so we revise it as follows:
catch (\Facebook\Exceptions\FacebookResponseException $e) { return false; // echo 'Graph returned an error: ' . $e->getMessage(); // exit; }
Get a public URL
- Use ngrok to get a public URL for the HTML page that we will use to get token from users.
- Login the application => Find login product => shortcut => website => paste the public URL
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