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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Service_Amazon
  * @subpackage Authentication
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 
 
 /**
  * @see Zend_Service_Amazon_Authentication
  */
 // require_once 'Zend/Service/Amazon/Authentication.php';
 
 /**
  * @see Zend_Crypt_Hmac
  */
 // require_once 'Zend/Crypt/Hmac.php';
 
 /**
  * @category   Zend
  * @package    Zend_Service_Amazon
  * @subpackage Authentication
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Service_Amazon_Authentication_S3 extends Zend_Service_Amazon_Authentication
 {
     /**
      * Add the S3 Authorization signature to the request headers
      *
      * @param  string $method
      * @param  string $path
      * @param  array &$headers
      * @return string
      */
     public function generateSignature($method, $path, &$headers)
     {
         if (! is_array($headers)) {
             $headers = array($headers);
         }
 
         $type = $md5 = $date = '';
 
         // Search for the Content-type, Content-MD5 and Date headers
         foreach ($headers as $key => $val) {
             if (strcasecmp($key, 'content-type') == 0) {
                 $type = $val;
             } else if (strcasecmp($key, 'content-md5') == 0) {
                 $md5 = $val;
             } else if (strcasecmp($key, 'date') == 0) {
                 $date = $val;
             }
         }
 
         // If we have an x-amz-date header, use that instead of the normal Date
         if (isset($headers['x-amz-date']) && isset($date)) {
             $date = '';
         }
 
         $sig_str = "$method\n$md5\n$type\n$date\n";
 
         // For x-amz- headers, combine like keys, lowercase them, sort them
         // alphabetically and remove excess spaces around values
         $amz_headers = array();
         foreach ($headers as $key => $val) {
             $key = strtolower($key);
             if (substr($key, 0, 6) == 'x-amz-') {
                 if (is_array($val)) {
                     $amz_headers[$key] = $val;
                 } else {
                     $amz_headers[$key][] = preg_replace('/\s+/', ' ', $val);
                 }
             }
         }
         if (!empty($amz_headers)) {
             ksort($amz_headers);
             foreach ($amz_headers as $key => $val) {
                 $sig_str .= $key . ':' . implode(',', $val) . "\n";
             }
         }
 
         $sig_str .= '/'.parse_url($path, PHP_URL_PATH);
         if (strpos($path, '?location') !== false) {
             $sig_str .= '?location';
         } else
             if (strpos($path, '?acl') !== false) {
                 $sig_str .= '?acl';
             } else
                 if (strpos($path, '?torrent') !== false) {
                     $sig_str .= '?torrent';
                 }
 
         $signature = base64_encode(Zend_Crypt_Hmac::compute($this->_secretKey, 'sha1', utf8_encode($sig_str), Zend_Crypt_Hmac::BINARY));
         $headers['Authorization'] = 'AWS ' . $this->_accessKey . ':' . $signature;
 
         return $sig_str;
     }
 }