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<?php
/**
 * Created by PhpStorm.
 * User: mxgel
 * Date: 11/14/16
 * Time: 2:28 AM
 */

namespace Knox\Pesapal\OAuth;


/**
 * Class OAuthSignatureMethod_HMAC_SHA1
 *
 * @package Knox\Pesapal\OAuth
 */
class OAuthSignatureMethod_HMAC_SHA1 extends OAuthSignatureMethod
{
    /**
     * @return string
     */
    function get_name()
    {
        return "HMAC-SHA1";
    }

    /**
     * @param $request
     * @param $consumer
     * @param $token
     *
     * @return string
     */
    public function build_signature($request, $consumer, $token)
    {
        $base_string = $request->get_signature_base_string();
        $request->base_string = $base_string;

        $key_parts = [
            $consumer->secret,
            ($token) ? $token->secret : "",
        ];

        $key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
        $key = implode('&', $key_parts);

        return base64_encode(hash_hmac('sha1', $base_string, $key, true));
    }
}