Getting an access token from the Facebook Graph API - php

Question

I'm trying to display facebook status updates for a sports team on their website using the facebook graph api, but can't seem to get a valid access token.
Here's my code.
require_once APPPATH.'/third_party/facebook-php-sdk-v4/src/Facebook/autoload.php';
$fb = new Facebook\Facebook([
'app_id' => '123123123123',
'app_secret' => 'fghdfghtyjdfghdghjfghjfghj',
'default_graph_version' => 'v2.5'
]);
$fb->setDefaultAccessToken('123123123123|dfhjfgytdfghdfhgdsfjd');
$helper = $fb->getCanvasHelper();
try {
$accessToken = $helper->getAccessToken();
} 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: ' . $e->getMessage();
exit;
}
if (isset($accessToken)) {
// Logged in.
} else {
echo 'access token not set - THIS IS WHERE I ALWAYS SEEM TO END UP';
}
exit;
Is there anything obvious I'm doing wrong?

Answer 1

This is what I used in a Laravel 4 app to connect. Basically when the user clicks on a 'Log in' button,
1- Create the Facebook instance with app_id, app_secret and default_graph_version.
2- Get a redirectLoginHelper object to get a loginUrl with a code that facebook will provide when you call $helper->getLoginUrl($redirectUrl, (array) $permissionsNeeded)
3- Redirect to that url
4- Create facebook instance and getRedirectLoginHelper again as step 1 and 2
5- Check if you received the 'code' parameter in the url the helped returned
6- Get the access token: $accessToken = $helper->getAccessToken()
In the code I'm providing, I do all this steps in one method. I check if there's a code parameter in the request, if not I request it and redirect. The next time the code runs, when I check if code is there, it continues to the next step
$fb = new Facebook([
'app_id' => 'facebook_app_id',
'app_secret' => 'facebook_app_secret',
'default_graph_version' => 'v2.5',
]);
$helper = $fb->getRedirectLoginHelper();
if(Input::get('code') == '') {
$permissions = ['manage_pages, publish_actions'];
$loginUrl = $helper->getLoginUrl('http://yoururl.dev/uri', $permissions);
return Redirect::to($loginUrl);
}
try {
$accessToken = $helper->getAccessToken();
} catch(Facebook\Exceptions\FacebookSDKException $e) {
//Handle error
}
In this case, the Log in button goes to www.domain.app/connect, the URL that the redirectLoginHelper returns is the same, but with the code parameter: www.domain.app/connect?code=ntasd341251