/**
* Get the Oauth Access Token of a user from callback code
*
* @param string $code - Oauth2 Code returned with callback url after successfull login
*
* @return InstagramOAuth
*/
public function oauth($code)
{
$options = ['grant_type' => 'authorization_code', 'client_id' => $this->app->getId(), 'client_secret' => $this->app->getSecret(), 'redirect_uri' => $this->getCallbackUrl(), 'code' => $code, 'state' => $this->state];
$response = HelperFactory::getInstance()->request($this->client, Constants::API_TOKEN, $options, 'POST');
$this->oauthResponse = new InstagramOAuth(json_decode($response->getBody()->getContents()));
return $this->oauthResponse;
}
/**
* Secure API Request by using endpoint, paramters and API secret
*
* @see https://www.instagram.com/developer/secure-api-requests/
*
* @param InstagramApp $app
* @param string $endpoint
* @param array $params
*
* @return string (Signature)
*/
public static function generateSignature(InstagramApp $app, $endpoint, $params)
{
$signature = $endpoint;
ksort($params);
foreach ($params as $key => $value) {
$signature .= "|{$key}={$value}";
}
return hash_hmac('sha256', $signature, $app->getSecret(), false);
}
