Cant get an accessToken from FB sdk

I would like to get images from my Instagram account to my web page. So I try to use FB php sdk and get accessToken first according this documentation. But it returns null. I don’t know what is wrong with the code.

public function getMedia()
{
    $fb = new FacebookFacebook([
        'app_id' => self::APP_ID,
        'app_secret' => self::APP_SECRET,
        'default_graph_version' => 'v2.10',
        //'default_access_token' => '{access-token}', // optional
    ]);

    $helper = $fb->getRedirectLoginHelper();  // Whichever helper I use access-token is null

    dd($helper->getAccessToken());
}

I need help with it. It could be so simple.

EDIT:

After few hours I have this, but the last command throws an FacebookExceptionsFacebookResponseException Invalid OAuth access token signature. As I see the token is app id and app secret joined with pipe. “733163597544229|xxxxxxxxxxxxx9d14362xxxx3a6”. This should work but does not work.

public function getMedia()
{
    $fb = new FacebookFacebook([
        'app_id' => self::APP_ID_FB,
        'app_secret' => self::APP_SECRET_FB,
        'default_graph_version' => 'v2.10',
        //'default_access_token' => '{access-token}', // optional
    ]);

    $token = $fb->getApp()->getAccessToken();
    $response = $fb->get('https://graph.instagram.com/me/media?fields=media_url,media_type', $token->getValue());

} 

Answer

If I’ve understood the docs correctly, if you want to get an access token dynamically, according to https://developers.facebook.com/docs/facebook-login/web, you need enable fb-login for your app

1. https://developers.facebook.com/apps/
2. select your app
3. add fb-login & follow the tips.

Otherwise you should just be able to get an access token for your app from the web interface and use that over and over.

See also : https://developers.facebook.com/docs/facebook-login/access-tokens#apptokens

There’s also:

https://developers.facebook.com/tools/explorer/?method=GET&path=me%3Ffields%3Did%2Cname&version=v9.0

Which enables you to generate an access token, and test out a call to the graph api, AND allows you to export code you can copy/paste:

try {
  // Returns a `FacebookFacebookResponse` object
  $response = $fb->get(
    '/me',
    '{access-token}'
  );
} catch(FacebookExceptionsFacebookResponseException $e) {
  echo 'Graph returned an error: ' . $e->getMessage();
  exit;
} catch(FacebookExceptionsFacebookSDKException $e) {
  echo 'Facebook SDK returned an error: ' . $e->getMessage();
  exit;
}
$graphNode = $response->getGraphNode();

EDIT:

I see in your original question you state:

As I see the token is app id and app secret joined with pipe. “733163597544229|xxxxxxxxxxxxx9d14362xxxx3a6”. This should work but does not work.

According to the docs, if you want to supply an access token as {app_id}|{client-token} (not sure what secret you’re using here) you should append this to the URL, which is not in the URL you’re using.

See example here: https://developers.facebook.com/docs/facebook-login/access-tokens#clienttokens

The URL they use is:

curl -i -X GET "https://graph.facebook.com/{your-user-id}/accounts?access_token={user-access-token}

So for you this be:

$response = $fb->get('https://graph.instagram.com/me/media?fields=media_url,media_type&access_token=733163597544229|{client_token}');

EDIT 2:

I managed to get your sample working so perhaps these screen shots will help:

PHP Code:

<?php
$accessToken="EAAJIZAj**************************************************************************************************************************************************************************ZD";

require_once __DIR__ . '/Facebook/autoload.php'; // change path as needed

//echo __DIR__ . '/Facebook/autoload.php';
$fb = new FacebookFacebook([
    'app_id' => '642**********502',
    'app_secret' => '0185*****************f743',
    'default_graph_version' => 'v2.10',
    'default_access_token' => "{$accessToken}"
]);

try {
    // Get the FacebookGraphNodesGraphUser object for the current user.
    // If you provided a 'default_access_token', the '{access-token}' is optional.
    $response = $fb->get('/me');
} catch(FacebookExceptionsFacebookResponseException $e) {
    // When Graph returns an error
    echo 'Graph returned an error: ' . $e->getMessage();
    exit;
} catch(FacebookExceptionsFacebookSDKException $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();

?>

I took the source code from https://github.com/facebookarchive/php-graph-sdk and copied the src/Facebook dir into my project. I amended the path location in my code

require_once __DIR__ . '/Facebook/autoload.php'; // change path as needed

//echo __DIR__ . '/Facebook/autoload.php'; //<< comment out everything else and check the path is correct with this.

Working code: (same as above) with successful output shown at the bottom of the screen shot.

If you need to get the app secret go to the apps settings to uncover it:

Seems you were right – the access token does have an expiry and I had to refresh mine since using it yesterday.