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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_WindowsAzure
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Service_WindowsAzure_Credentials_CredentialsAbstract
  */
 // require_once 'Zend/Service/WindowsAzure/Credentials/CredentialsAbstract.php';
 
 /**
  * @category   Zend
  * @package    Zend_Service_WindowsAzure
  * @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_WindowsAzure_Credentials_SharedKey
     extends Zend_Service_WindowsAzure_Credentials_CredentialsAbstract
 {
     /**
    * Sign request URL with credentials
    *
    * @param string $requestUrl Request URL
    * @param string $resourceType Resource type
    * @param string $requiredPermission Required permission
    * @return string Signed request URL
    */
   public function signRequestUrl(
     $requestUrl = '',
     $resourceType = Zend_Service_WindowsAzure_Storage::RESOURCE_UNKNOWN,
     $requiredPermission = Zend_Service_WindowsAzure_Credentials_CredentialsAbstract::PERMISSION_READ
   ) {
       return $requestUrl;
   }
   
   /**
    * Sign request headers with credentials
    *
    * @param string $httpVerb HTTP verb the request will use
    * @param string $path Path for the request
    * @param string $queryString Query string for the request
    * @param array $headers x-ms headers to add
    * @param boolean $forTableStorage Is the request for table storage?
    * @param string $resourceType Resource type
    * @param string $requiredPermission Required permission
    * @param mixed  $rawData Raw post data
    * @return array Array of headers
    */
   public function signRequestHeaders(
     $httpVerb = Zend_Http_Client::GET,
     $path = '/',
     $queryString = '',
     $headers = null,
     $forTableStorage = false,
     $resourceType = Zend_Service_WindowsAzure_Storage::RESOURCE_UNKNOWN,
     $requiredPermission = Zend_Service_WindowsAzure_Credentials_CredentialsAbstract::PERMISSION_READ,
     $rawData = null
   ) {
     // http://github.com/sriramk/winazurestorage/blob/214010a2f8931bac9c96dfeb337d56fe084ca63b/winazurestorage.py
 
     // Table storage?
     if ($forTableStorage) {
       // require_once 'Zend/Service/WindowsAzure/Credentials/Exception.php';
       throw new Zend_Service_WindowsAzure_Credentials_Exception('The Windows Azure SDK for PHP does not support SharedKey authentication on table storage. Use SharedKeyLite authentication instead.');
     }
     
     // Determine path
     if ($this->_usePathStyleUri) {
       $path = substr($path, strpos($path, '/'));
     }
 
     // Determine query
     $queryString = $this->_prepareQueryStringForSigning($queryString);
   
     // Canonicalized headers
     $canonicalizedHeaders = array();
     
     // Request date
     $requestDate = '';
     if (isset($headers[Zend_Service_WindowsAzure_Credentials_CredentialsAbstract::PREFIX_STORAGE_HEADER . 'date'])) {
         $requestDate = $headers[Zend_Service_WindowsAzure_Credentials_CredentialsAbstract::PREFIX_STORAGE_HEADER . 'date'];
     } else {
         $requestDate = gmdate('D, d M Y H:i:s', time()) . ' GMT'; // RFC 1123
         $canonicalizedHeaders[] = Zend_Service_WindowsAzure_Credentials_CredentialsAbstract::PREFIX_STORAGE_HEADER . 'date:' . $requestDate;
     }
     
     // Build canonicalized headers
     if (!is_null($headers)) {
       foreach ($headers as $header => $value) {
         if (is_bool($value)) {
           $value = $value === true ? 'True' : 'False';
         }
 
         $headers[$header] = $value;
         if (substr($header, 0, strlen(Zend_Service_WindowsAzure_Credentials_CredentialsAbstract::PREFIX_STORAGE_HEADER)) == Zend_Service_WindowsAzure_Credentials_CredentialsAbstract::PREFIX_STORAGE_HEADER) {
             $canonicalizedHeaders[] = strtolower($header) . ':' . $value;
         }
       }
     }
     sort($canonicalizedHeaders);
 
     // Build canonicalized resource string
     $canonicalizedResource  = '/' . $this->_accountName;
     if ($this->_usePathStyleUri) {
       $canonicalizedResource .= '/' . $this->_accountName;
     }
     $canonicalizedResource .= $path;
     if ($queryString !== '') {
         $queryStringItems = $this->_makeArrayOfQueryString($queryString);
         foreach ($queryStringItems as $key => $value) {
           $canonicalizedResource .= "\n" . strtolower($key) . ':' . urldecode($value);
         }
     }
     
     // Content-Length header
     $contentLength = '';
     if (strtoupper($httpVerb) != Zend_Http_Client::GET
        && strtoupper($httpVerb) != Zend_Http_Client::DELETE
        && strtoupper($httpVerb) != Zend_Http_Client::HEAD) {
       $contentLength = 0;
       
       if (!is_null($rawData)) {
         $contentLength = strlen($rawData);
       }
     }
 
     // Create string to sign   
     $stringToSign   = array();
     $stringToSign[] = strtoupper($httpVerb);                  // VERB
       $stringToSign[] = $this->_issetOr($headers, 'Content-Encoding', '');    // Content-Encoding
       $stringToSign[] = $this->_issetOr($headers, 'Content-Language', '');    // Content-Language
       $stringToSign[] = $contentLength;                       // Content-Length
       $stringToSign[] = $this->_issetOr($headers, 'Content-MD5', '');       // Content-MD5
       $stringToSign[] = $this->_issetOr($headers, 'Content-Type', '');      // Content-Type
       $stringToSign[] = "";                           // Date
       $stringToSign[] = $this->_issetOr($headers, 'If-Modified-Since', '');   // If-Modified-Since
       $stringToSign[] = $this->_issetOr($headers, 'If-Match', '');        // If-Match
       $stringToSign[] = $this->_issetOr($headers, 'If-None-Match', '');     // If-None-Match
       $stringToSign[] = $this->_issetOr($headers, 'If-Unmodified-Since', '');   // If-Unmodified-Since
       $stringToSign[] = $this->_issetOr($headers, 'Range', '');         // Range
       
       if (!$forTableStorage && count($canonicalizedHeaders) > 0) {
         $stringToSign[] = implode("\n", $canonicalizedHeaders); // Canonicalized headers
       }
         
       $stringToSign[] = $canonicalizedResource;         // Canonicalized resource
       $stringToSign   = implode("\n", $stringToSign);
       $signString     = base64_encode(hash_hmac('sha256', $stringToSign, $this->_accountKey, true));
 
       // Sign request
       $headers[Zend_Service_WindowsAzure_Credentials_CredentialsAbstract::PREFIX_STORAGE_HEADER . 'date'] = $requestDate;
       $headers['Authorization'] = 'SharedKey ' . $this->_accountName . ':' . $signString;
       
       // Return headers
       return $headers;
   }
 }