<?php

function yms_send_reply($result, $api_key = '', $extra = array())

{

  header('Content-type: text/plain');

  global $g_api_key;

  if ( empty($api_key) )

    $api_key = $g_api_key;

  if ( empty($api_key) )

    $api_key = base64_encode("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00");

  $now = gmdate("Y-m-d\TH:i:s");

  echo yms_generate_signed_response(array_merge($extra, array(

      't' => $now,

      'status' => $result

    )), $api_key);

  exit;

}

function yms_generate_signed_response($response, $api_key)

{

  $hash = yms_val_sign($response, $api_key);

  $result = "h={$hash}\n";

  foreach ( $response as $key => $value )

  {

    $result .= "{$key}={$value}\n";

  }

  return trim($result);

}

function yms_val_sign($response, $api_key)

{

  foreach ( array('h', 'title', 'auth') as $key )

    if ( isset($response[$key]) )

      unset($response[$key]);

  ksort($response);

  $signstr = array();

  foreach ( $response as $key => $value )

  {

    $signstr[] = "$key=$value";

  }

  $signstr = implode('&', $signstr);

  $api_key = yms_hex_encode(base64_decode($api_key));

  $hash = hmac_sha1($signstr, $api_key);

  $hash = yms_hex_decode($hash);

  $hash = base64_encode($hash);

  return $hash;

}