How Can I Extend Facebook Access Token Validity After Offline_Access Deprecation?

Extending Access Token Validity Post Offline_Access Deprecation

Problem:

With the deprecation of the offline_access permission in Facebook's Authentication flow, retrieving long-lived access tokens without that permission has become a challenge. Despite Facebook's documentation stating that server-side OAuth tokens will be long-lived, they are not.

Solution:

Facebook has updated the PHP SDK to include a method for extending access token validity.

Updated SDK Method:

A public function named setExtendedAccessToken has been added to base_facebook.php. This function returns a new access token with an expiration of 60 days.

Usage:

Call this function after receiving the normal access token. You can access the new token using the getAccessToken public function.

Extended Access Token Function:

public function getExtendedAccessToken(){

    try {
        $access_token_response =
            $this->_oauthRequest(
                $this->getUrl('graph', '/oauth/access_token'), array(
                    'client_id' => $this->getAppId(),
                    'client_secret' => $this->getAppSecret(),
                    'grant_type' => 'fb_exchange_token',
                    'fb_exchange_token' => $this->getAccessToken()
                )
            );
    } catch (FacebookApiException $e) {
        return false;
    }

    if (empty($access_token_response)) {
        return false;
    }

    $response_params = array();
    parse_str($access_token_response, $response_params);
    if (!isset($response_params['access_token'])) {
        return false;
    }

    return $response_params['access_token'];
}

Note:

• Ensure you have enabled "Deprecate Offline Access" in your Advanced App Settings.
• Call setExtendedAccessToken to obtain the extended token.
• Access the extended token using getAccessToken.

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