Cant get an accessToken from FB sdk - php

Question

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 \Facebook\Facebook([
'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 Facebook\Exceptions\FacebookResponseException 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 \Facebook\Facebook([
'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 1

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
https://developers.facebook.com/apps/
select your app
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';
$fb = new \Facebook\Facebook([
'app_id' => '642**********502',
'app_secret' => '0185*****************f743',
'default_graph_version' => 'v2.10',
'default_access_token' => "{$accessToken}"
]);
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');
} 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();
?>
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.

Answer 2

As far as I know this will probably not work to get the access token .
To get access token you need to implement the login with facebook in your app to get the access token . If your app is only used by limited user then you can get access token on this link https://developers.facebook.com/tools/explorer/ but if your app is used by wide range of user and each user has their own data then you need to implement oauth2 in your app