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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 Service
* @subpackage Amazon_Sqs
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Sqs.php 16590 2009-07-09 20:04:16Z matthew $
*/
/**
* @see Zend_Service_Amazon_Abstract
*/
require_once 'Zend/Service/Amazon/Abstract.php';
/**
* @see Zend_Crypt_Hmac
*/
require_once 'Zend/Crypt/Hmac.php';
/**
* Class for connecting to the Amazon Simple Queue Service (SQS)
*
* @category Zend
* @package Service
* @subpackage Amazon_Sqs
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @see http://aws.amazon.com/sqs/ Amazon Simple Queue Service
*/
class Zend_Service_Amazon_Sqs extends Zend_Service_Amazon_Abstract
{
/**
* Default timeout for createQueue() function
*/
const CREATE_TIMEOUT_DEFAULT = 30;
/**
* HTTP end point for the Amazon SQS service
*/
protected $_sqsEndpoint = 'queue.amazonaws.com';
/**
* The API version to use
*/
protected $_sqsApiVersion = '2009-02-01';
/**
* Signature Version
*/
protected $_sqsSignatureVersion = '2';
/**
* Signature Encoding Method
*/
protected $_sqsSignatureMethod = 'HmacSHA256';
/**
* Constructor
*
* @param string $accessKey
* @param string $secretKey
* @param string $region
*/
public function __construct($accessKey = null, $secretKey = null, $region = null)
{
parent::__construct($accessKey, $secretKey, $region);
}
/**
* Create a new queue
*
* Visibility timeout is how long a message is left in the queue "invisible"
* to other readers. If the message is acknowleged (deleted) before the
* timeout, then the message is deleted. However, if the timeout expires
* then the message will be made available to other queue readers.
*
* @param string $queue_name queue name
* @param integer $timeout default visibility timeout
* @return string|boolean
* @throws Zend_Service_Amazon_Sqs_Exception
*/
public function create($queue_name, $timeout = null)
{
$params = array();
$params['QueueName'] = $queue_name;
$timeout = ($timeout === null) ? self::CREATE_TIMEOUT_DEFAULT : (int)$timeout;
$params['DefaultVisibilityTimeout'] = $timeout;
$retry_count = 0;
do {
$retry = false;
$result = $this->_makeRequest(null, 'CreateQueue', $params);
if ($result->CreateQueueResult->QueueUrl === null) {
if ($result->Error->Code == 'AWS.SimpleQueueService.QueueNameExists') {
return false;
} elseif ($result->Error->Code == 'AWS.SimpleQueueService.QueueDeletedRecently') {
// Must sleep for 60 seconds, then try re-creating the queue
sleep(60);
$retry = true;
$retry_count++;
} else {
require_once 'Zend/Service/Amazon/Sqs/Exception.php';
throw new Zend_Service_Amazon_Sqs_Exception($result->Error->Code);
}
} else {
return (string) $result->CreateQueueResult->QueueUrl;
}
} while ($retry);
return false;
}
/**
* Delete a queue and all of it's messages
*
* Returns false if the queue is not found, true if the queue exists
*
* @param string $queue_url queue URL
* @return boolean
* @throws Zend_Service_Amazon_Sqs_Exception
*/
public function delete($queue_url)
{
$result = $this->_makeRequest($queue_url, 'DeleteQueue');
if ($result->Error->Code !== null) {
require_once 'Zend/Service/Amazon/Sqs/Exception.php';
throw new Zend_Service_Amazon_Sqs_Exception($result->Error->Code);
}
return true;
}
/**
* Get an array of all available queues
*
* @return array
* @throws Zend_Service_Amazon_Sqs_Exception
*/
public function getQueues()
{
$result = $this->_makeRequest(null, 'ListQueues');
if ($result->ListQueuesResult->QueueUrl === null) {
require_once 'Zend/Service/Amazon/Sqs/Exception.php';
throw new Zend_Service_Amazon_Sqs_Exception($result->Error->Code);
}
$queues = array();
foreach ($result->ListQueuesResult->QueueUrl as $queue_url) {
$queues[] = (string)$queue_url;
}
return $queues;
}
/**
* Return the approximate number of messages in the queue
*
* @param string $queue_url Queue URL
* @return integer
* @throws Zend_Service_Amazon_Sqs_Exception
*/
public function count($queue_url)
{
return (int)$this->getAttribute($queue_url, 'ApproximateNumberOfMessages');
}
/**
* Send a message to the queue
*
* @param string $queue_url Queue URL
* @param string $message Message to send to the queue
* @return string Message ID
* @throws Zend_Service_Amazon_Sqs_Exception
*/
public function send($queue_url, $message)
{
$params = array();
$params['MessageBody'] = urlencode($message);
$checksum = md5($params['MessageBody']);
$result = $this->_makeRequest($queue_url, 'SendMessage', $params);
if ($result->SendMessageResult->MessageId === null) {
require_once 'Zend/Service/Amazon/Sqs/Exception.php';
throw new Zend_Service_Amazon_Sqs_Exception($result->Error->Code);
} else if ((string) $result->SendMessageResult->MD5OfMessageBody != $checksum) {
require_once 'Zend/Service/Amazon/Sqs/Exception.php';
throw new Zend_Service_Amazon_Sqs_Exception('MD5 of body does not match message sent');
}
return (string) $result->SendMessageResult->MessageId;
}
/**
* Get messages in the queue
*
* @param string $queue_url Queue name
* @param integer $max_messages Maximum number of messages to return
* @param integer $timeout Visibility timeout for these messages
* @return array
* @throws Zend_Service_Amazon_Sqs_Exception
*/
public function receive($queue_url, $max_messages = null, $timeout = null)
{
$params = array();
// If not set, the visibility timeout on the queue is used
if ($timeout !== null) {
$params['VisibilityTimeout'] = (int)$timeout;
}
// SQS will default to only returning one message
if ($max_messages !== null) {
$params['MaxNumberOfMessages'] = (int)$max_messages;
}
$result = $this->_makeRequest($queue_url, 'ReceiveMessage', $params);
if ($result->ReceiveMessageResult->Message === null) {
require_once 'Zend/Service/Amazon/Sqs/Exception.php';
throw new Zend_Service_Amazon_Sqs_Exception($result->Error->Code);
}
$data = array();
foreach ($result->ReceiveMessageResult->Message as $message) {
$data[] = array(
'message_id' => (string)$message->MessageId,
'handle' => (string)$message->ReceiptHandle,
'md5' => (string)$message->MD5OfBody,
'body' => urldecode((string)$message->Body),
);
}
return $data;
}
/**
* Delete a message from the queue
*
* Returns true if the message is deleted, false if the deletion is
* unsuccessful.
*
* @param string $queue_url Queue URL
* @param string $handle Message handle as returned by SQS
* @return boolean
* @throws Zend_Service_Amazon_Sqs_Exception
*/
public function deleteMessage($queue_url, $handle)
{
$params = array();
$params['ReceiptHandle'] = (string)$handle;
$result = $this->_makeRequest($queue_url, 'DeleteMessage', $params);
if ($result->Error->Code !== null) {
return false;
}
// Will always return true unless ReceiptHandle is malformed
return true;
}
/**
* Get the attributes for the queue
*
* @param string $queue_url Queue URL
* @param string $attribute
* @return string
* @throws Zend_Service_Amazon_Sqs_Exception
*/
public function getAttribute($queue_url, $attribute = 'All')
{
$params = array();
$params['AttributeName'] = $attribute;
$result = $this->_makeRequest($queue_url, 'GetQueueAttributes', $params);
if ($result->GetQueueAttributesResult->Attribute === null) {
require_once 'Zend/Service/Amazon/Sqs/Exception.php';
throw new Zend_Service_Amazon_Sqs_Exception($result->Error->Code);
}
return (string) $result->GetQueueAttributesResult->Attribute->Value;
}
/**
* Make a request to Amazon SQS
*
* @param string $queue Queue Name
* @param string $action SQS action
* @param array $params
* @return SimpleXMLElement
*/
private function _makeRequest($queue_url, $action, $params = array())
{
$params['Action'] = $action;
$params = $this->addRequiredParameters($queue_url, $params);
if ($queue_url === null) {
$queue_url = '/';
}
$client = self::getHttpClient();
switch ($action) {
case 'ListQueues':
case 'CreateQueue':
$client->setUri('http://'.$this->_sqsEndpoint);
break;
default:
$client->setUri($queue_url);
break;
}
$retry_count = 0;
do {
$retry = false;
$client->resetParameters();
$client->setParameterGet($params);
$response = $client->request('GET');
$response_code = $response->getStatus();
// Some 5xx errors are expected, so retry automatically
if ($response_code >= 500 && $response_code < 600 && $retry_count <= 5) {
$retry = true;
$retry_count++;
sleep($retry_count / 4 * $retry_count);
}
} while ($retry);
unset($client);
return new SimpleXMLElement($response->getBody());
}
/**
* Adds required authentication and version parameters to an array of
* parameters
*
* The required parameters are:
* - AWSAccessKey
* - SignatureVersion
* - Timestamp
* - Version and
* - Signature
*
* If a required parameter is already set in the <tt>$parameters</tt> array,
* it is overwritten.
*
* @param string $queue_url Queue URL
* @param array $parameters the array to which to add the required
* parameters.
* @return array
*/
protected function addRequiredParameters($queue_url, array $parameters)
{
$parameters['AWSAccessKeyId'] = $this->_getAccessKey();
$parameters['SignatureVersion'] = $this->_sqsSignatureVersion;
$parameters['Timestamp'] = gmdate('Y-m-d\TH:i:s\Z', time()+10);
$parameters['Version'] = $this->_sqsApiVersion;
$parameters['SignatureMethod'] = $this->_sqsSignatureMethod;
$parameters['Signature'] = $this->_signParameters($queue_url, $parameters);
return $parameters;
}
/**
* Computes the RFC 2104-compliant HMAC signature for request parameters
*
* This implements the Amazon Web Services signature, as per the following
* specification:
*
* 1. Sort all request parameters (including <tt>SignatureVersion</tt> and
* excluding <tt>Signature</tt>, the value of which is being created),
* ignoring case.
*
* 2. Iterate over the sorted list and append the parameter name (in its
* original case) and then its value. Do not URL-encode the parameter
* values before constructing this string. Do not use any separator
* characters when appending strings.
*
* @param string $queue_url Queue URL
* @param array $parameters the parameters for which to get the signature.
*
* @return string the signed data.
*/
protected function _signParameters($queue_url, array $paramaters)
{
$data = "GET\n";
$data .= $this->_sqsEndpoint . "\n";
if ($queue_url !== null) {
$data .= parse_url($queue_url, PHP_URL_PATH);
}
else {
$data .= '/';
}
$data .= "\n";
uksort($paramaters, 'strcmp');
unset($paramaters['Signature']);
$arrData = array();
foreach($paramaters as $key => $value) {
$arrData[] = $key . '=' . str_replace('%7E', '~', urlencode($value));
}
$data .= implode('&', $arrData);
$hmac = Zend_Crypt_Hmac::compute($this->_getSecretKey(), 'SHA256', $data, Zend_Crypt_Hmac::BINARY);
return base64_encode($hmac);
}
}
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