/**
* Get the signature method name, and if it is supported.
*
* @param JacobKiers\OAuth\Request\RequestInterface $request
*
* @return string Signature method name.
*
* @throws JacobKiers\OAuth\OAuthException
*/
private function getSignatureMethod(RequestInterface $request)
{
$signature_method = $request instanceof RequestInterface ? $request->getOAuthSignatureMethod() : null;
if (!$signature_method) {
// According to chapter 7 ("Accessing Protected Resources") the signature-method
// parameter is required, and we can't just fallback to PLAINTEXT
throw new OAuthException('No signature method parameter. This parameter is required');
}
if (!in_array($signature_method, array_keys($this->signature_methods))) {
throw new OAuthException("Signature method '{$signature_method}' not supported, try one of the following: " . implode(", ", array_keys($this->signature_methods)));
}
return $this->signature_methods[$signature_method];
}
