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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_SharedKeyLite
     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,
     $rawData = null
   ) {
     // Table storage?
     if (!$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 SharedKeyLite authentication on blob or queue storage. Use SharedKey authentication instead.');
     }
     
     // Determine path
     if ($this->_usePathStyleUri) {
       $path = substr($path, strpos($path, '/'));
     }
 
     // Determine query
     $queryString = $this->_prepareQueryStringForSigning($queryString);
 
     // Build canonicalized resource string
     $canonicalizedResource  = '/' . $this->_accountName;
     if ($this->_usePathStyleUri) {
       $canonicalizedResource .= '/' . $this->_accountName;
     }
     $canonicalizedResource .= $path;
     if ($queryString !== '') {
         $canonicalizedResource .= $queryString;
     }
 
     // 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
     }
 
     // Create string to sign   
     $stringToSign   = array();
       $stringToSign[] = $requestDate; // Date
       $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'] = 'SharedKeyLite ' . $this->_accountName . ':' . $signString;
       
       // Return headers
       return $headers;
   }
   
   /**
    * Prepare query string for signing
    * 
    * @param  string $value Original query string
    * @return string        Query string for signing
    */
   protected function _prepareQueryStringForSigning($value)
   {
       // Check for 'comp='
       if (strpos($value, 'comp=') === false) {
           // If not found, no query string needed
           return '';
       } else {
           // If found, make sure it is the only parameter being used      
         if (strlen($value) > 0 && strpos($value, '?') === 0) {
           $value = substr($value, 1);
         }
         
         // Split parts
         $queryParts = explode('&', $value);
         foreach ($queryParts as $queryPart) {
             if (strpos($queryPart, 'comp=') !== false) {
                 return '?' . $queryPart;
             }
         }
 
         // Should never happen...
       return '';
       }
   }
 }