/**
* Creates a signed JWT.
* @param array $payload
* @return string The signed JWT.
*/
private function makeSignedJwt($payload)
{
$header = array('typ' => 'JWT', 'alg' => 'RS256');
$payload = json_encode($payload);
// Handle some overzealous escaping in PHP json that seemed to cause some errors
// with claimsets.
$payload = str_replace('\\/', '/', $payload);
$segments = array(GoogleGAL_Utils::urlSafeB64Encode(json_encode($header)), GoogleGAL_Utils::urlSafeB64Encode($payload));
$signingInput = implode('.', $segments);
$signer = new GoogleGAL_Signer_P12($this->privateKey, $this->privateKeyPassword);
$signature = $signer->sign($signingInput);
$segments[] = GoogleGAL_Utils::urlSafeB64Encode($signature);
return implode(".", $segments);
}