upload/sdk/Sina/SCS.php

<?php
/**
* $Id$
*
* Copyright (c) 2014, Sina Cloud Storage.  All rights reserved.
* @author Bruce Chen <662005@qq.com>
* @link http://weibo.com/smcz
*/

/**
* Sina Cloud Storage PHP class
*
* @link http://weibo.com/smcz
* @version 0.1.0-dev
*/
class SCS
{
	// ACL flags
	const ACL_PRIVATE = 'private';
	const ACL_PUBLIC_READ = 'public-read';
	const ACL_PUBLIC_READ_WRITE = 'public-read-write';
	const ACL_AUTHENTICATED_READ = 'authenticated-read';

	const STORAGE_CLASS_STANDARD = 'STANDARD';
	const STORAGE_CLASS_RRS = 'REDUCED_REDUNDANCY';

	const SSE_NONE = '';
	const SSE_AES256 = 'AES256';

	/**
	 * The SCS Access key
	 *
	 * @var string
	 * @access private
	 * @static
	 */
	private static $__accessKey = null;
	
	/**
	 * SCS Secret Key
	 *
	 * @var string
	 * @access private
	 * @static
	 */
	private static $__secretKey = null;
	
	/**
	 * SSL Client key
	 *
	 * @var string
	 * @access private
	 * @static
	 */
	private static $__sslKey = null;
	
	/**
	 * SCS URI
	 *
	 * @var string
	 * @acess public
	 * @static
	 */
	public static $endpoint = 'sinacloud.net';
	
	/**
	 * Proxy information
	 *
	 * @var null|array
	 * @access public
	 * @static
	 */
	public static $proxy = null;
	
	/**
	 * Connect using SSL?
	 *
	 * @var bool
	 * @access public
	 * @static
	 */
	public static $useSSL = false;
	
	/**
	 * Use SSL validation?
	 *
	 * @var bool
	 * @access public
	 * @static
	 */
	public static $useSSLValidation = true;
	
	/**
	 * Use PHP exceptions?
	 *
	 * @var bool
	 * @access public
	 * @static
	 */
	public static $useExceptions = false;

	/**
	 * Time offset applied to time()
	 * @access private
	 * @static
	 */
	private static $__timeOffset = 5;

	/**
	 * SSL client key
	 *
	 * @var bool
	 * @access public
	 * @static
	 */
	public static $sslKey = null;
	
	/**
	 * SSL client certfificate
	 *
	 * @var string
	 * @acess public
	 * @static
	 */
	public static $sslCert = null;
	
	/**
	 * SSL CA cert (only required if you are having problems with your system CA cert)
	 *
	 * @var string
	 * @access public
	 * @static
	 */
	public static $sslCACert = null;
	
	/**
	 * SCS Key Pair ID
	 *
	 * @var string
	 * @access private
	 * @static
	 */
	private static $__signingKeyPairId = null;
	
	/**
	 * Key resource, freeSigningKey() must be called to clear it from memory
	 *
	 * @var bool
	 * @access private
	 * @static 
	 */
	private static $__signingKeyResource = false;


	/**
	* Constructor - if you're not using the class statically
	*
	* @param string $accessKey Access key
	* @param string $secretKey Secret key
	* @param boolean $useSSL Enable SSL
	* @param string $endpoint Amazon URI
	* @return void
	*/
	public function __construct($accessKey = null, $secretKey = null, $useSSL = false, $endpoint = 'sinacloud.net')
	{
		if ($accessKey !== null && $secretKey !== null)
			self::setAuth($accessKey, $secretKey);
		self::$useSSL = $useSSL;
		self::$endpoint = $endpoint;
	}


	/**
	* Set the service endpoint
	*
	* @param string $host Hostname
	* @return void
	*/
	public function setEndpoint($host)
	{
		self::$endpoint = $host;
	}

	/**
	* Set SCS access key and secret key
	*
	* @param string $accessKey Access key
	* @param string $secretKey Secret key
	* @return void
	*/
	public static function setAuth($accessKey, $secretKey)
	{
		self::$__accessKey = $accessKey;
		self::$__secretKey = $secretKey;
	}


	/**
	* Check if SCS keys have been set
	*
	* @return boolean
	*/
	public static function hasAuth() {
		return (self::$__accessKey !== null && self::$__secretKey !== null);
	}


	/**
	* Set SSL on or off
	*
	* @param boolean $enabled SSL enabled
	* @param boolean $validate SSL certificate validation
	* @return void
	*/
	public static function setSSL($enabled, $validate = true)
	{
		self::$useSSL = $enabled;
		self::$useSSLValidation = $validate;
	}


	/**
	* Set SSL client certificates (experimental)
	*
	* @param string $sslCert SSL client certificate
	* @param string $sslKey SSL client key
	* @param string $sslCACert SSL CA cert (only required if you are having problems with your system CA cert)
	* @return void
	*/
	public static function setSSLAuth($sslCert = null, $sslKey = null, $sslCACert = null)
	{
		self::$sslCert = $sslCert;
		self::$sslKey = $sslKey;
		self::$sslCACert = $sslCACert;
	}


	/**
	* Set proxy information
	*
	* @param string $host Proxy hostname and port (localhost:1234)
	* @param string $user Proxy username
	* @param string $pass Proxy password
	* @param constant $type CURL proxy type
	* @return void
	*/
	public static function setProxy($host, $user = null, $pass = null, $type = CURLPROXY_SOCKS5)
	{
		self::$proxy = array('host' => $host, 'type' => $type, 'user' => $user, 'pass' => $pass);
	}


	/**
	* Set the error mode to exceptions
	*
	* @param boolean $enabled Enable exceptions
	* @return void
	*/
	public static function setExceptions($enabled = true)
	{
		self::$useExceptions = $enabled;
	}


	/**
	* Set SCS time correction offset (use carefully)
	*
	* This can be used when an inaccurate system time is generating
	* invalid request signatures.  It should only be used as a last
	* resort when the system time cannot be changed.
	*
	* @param string $offset Time offset (set to zero to use SCS server time)
	* @return void
	*/
	public static function setTimeCorrectionOffset($offset = 0)
	{
		if ($offset == 0)
		{
			$rest = new SCSRequest('HEAD');
			$rest = $rest->getResponse();
			$awstime = $rest->headers['date'];
			$systime = time();			
			$offset = $systime > $awstime ? -($systime - $awstime) : ($awstime - $systime);
		}
		self::$__timeOffset = $offset;
	}


	/**
	* Set signing key
	*
	* @param string $keyPairId SCS Key Pair ID
	* @param string $signingKey Private Key
	* @param boolean $isFile Load private key from file, set to false to load string
	* @return boolean
	*/
	public static function setSigningKey($keyPairId, $signingKey, $isFile = true)
	{
		self::$__signingKeyPairId = $keyPairId;
		if ((self::$__signingKeyResource = openssl_pkey_get_private($isFile ?
		file_get_contents($signingKey) : $signingKey)) !== false) return true;
		self::__triggerError('SCS::setSigningKey(): Unable to open load private key: '.$signingKey, __FILE__, __LINE__);
		return false;
	}


	/**
	* Free signing key from memory, MUST be called if you are using setSigningKey()
	*
	* @return void
	*/
	public static function freeSigningKey()
	{
		if (self::$__signingKeyResource !== false)
			openssl_free_key(self::$__signingKeyResource);
	}


	/**
	* Internal error handler
	*
	* @internal Internal error handler
	* @param string $message Error message
	* @param string $file Filename
	* @param integer $line Line number
	* @param integer $code Error code
	* @return void
	*/
	private static function __triggerError($message, $file, $line, $code = 0)
	{
		if (self::$useExceptions)
			throw new SCSException($message, $file, $line, $code);
		else
			trigger_error($message, E_USER_WARNING);
	}


	/**
	* Get a list of buckets
	*
	* @param boolean $detailed Returns detailed bucket list when true
	* @return array | false
	*/
	public static function listBuckets($detailed = false)
	{
		$rest = new SCSRequest('GET', '', '', self::$endpoint);
		$rest = $rest->getResponse();
		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::listBuckets(): [%s] %s", $rest->error['code'],
			$rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		$results = array();
		if (!isset($rest->body->Buckets)) return $results;

		if ($detailed)
		{
			if (isset($rest->body->Owner, $rest->body->Owner->ID, $rest->body->Owner->DisplayName))
			$results['owner'] = array(
				'id' => (string)$rest->body->Owner->ID, 'name' => (string)$rest->body->Owner->DisplayName
			);
			$results['buckets'] = array();
			//foreach ($rest->body->Buckets->Bucket as $b)
			foreach ($rest->body->Buckets as $b)
				$results['buckets'][] = array(
					'name' => (string)$b->Name, 'time' => strtotime((string)$b->CreationDate), 'consumed_bytes' => (string)$b->ConsumedBytes
				);
		} else
			foreach ($rest->body->Buckets as $b) $results[] = (string)$b->Name;
			//foreach ($rest->body->Buckets->Bucket as $b) $results[] = (string)$b->Name;

		return $results;
	}


	/**
	* Get contents for a bucket
	*
	* If maxKeys is null this method will loop through truncated result sets
	*
	* @param string $bucket Bucket name
	* @param string $prefix Prefix
	* @param string $marker Marker (last file listed)
	* @param string $maxKeys Max keys (maximum number of keys to return)
	* @param string $delimiter Delimiter
	* @param boolean $returnCommonPrefixes Set to true to return CommonPrefixes
	* @param boolean &$isTruncated
	* @return array | false
	*/
	public static function getBucket($bucket, $prefix = null, $marker = null, $maxKeys = null, $delimiter = null, $returnCommonPrefixes = false, &$nextMarker = null, &$isTruncated = false)
	{
		$rest = new SCSRequest('GET', $bucket, '', self::$endpoint);
		if ($maxKeys == 0) $maxKeys = null;
		if ($prefix !== null && $prefix !== '') $rest->setParameter('prefix', $prefix);
		if ($marker !== null && $marker !== '') $rest->setParameter('marker', $marker);
		if ($maxKeys !== null && $maxKeys !== '') $rest->setParameter('max-keys', $maxKeys);
		if ($delimiter !== null && $delimiter !== '') $rest->setParameter('delimiter', $delimiter);
		$response = $rest->getResponse();
		if ($response->error === false && $response->code !== 200)
			$response->error = array('code' => $response->code, 'message' => 'Unexpected HTTP status');
		if ($response->error !== false)
		{
			self::__triggerError(sprintf("SCS::getBucket(): [%s] %s",
			$response->error['code'], $response->error['message']), __FILE__, __LINE__);
			return false;
		}
		
		$results = array();

		if ($returnCommonPrefixes && isset($response->body, $response->body->CommonPrefixes))
		{
			foreach ($response->body->CommonPrefixes as $c)
				$results[(string)$c->Prefix] = array('prefix' => (string)$c->Prefix);
		}

		$nextMarker = null;
		
		if (isset($response->body, $response->body->Contents))
		{
			foreach ($response->body->Contents as $c)
			{
				$a = get_object_vars($c);
					
				$results[(string)$c->Name] = array(
					'name' => (string)$c->Name,
					'time' => strtotime((string)$a['Last-Modified']),
					'type' => (string)$a['Content-Type'],
					'owner' => (string)$a['Owner'],
					'size' => (int)$c->Size,
					//'hash' => substr((string)$c->ETag, 1, -1),
					'md5' => (string)$c->MD5,
					'sha1' => (string)$c->SHA1,
				);
				
				$nextMarker = (string)$c->Name;
			}
		}
		
		if (isset($response->body, $response->body->IsTruncated))
			$isTruncated = (bool)$response->body->IsTruncated;
		
		if (isset($response->body, $response->body->IsTruncated) && (bool)$response->body->IsTruncated == false) 
			return $results;

		if (isset($response->body, $response->body->NextMarker))
			$nextMarker = (string)$response->body->NextMarker;

		// Loop through truncated results if maxKeys isn't specified
		if ($maxKeys == null && $nextMarker !== null && (bool)$response->body->IsTruncated == true)
		{
			do
			{
				$rest = new SCSRequest('GET', $bucket, '', self::$endpoint);
				
				if ($prefix !== null && $prefix !== '') 
					$rest->setParameter('prefix', $prefix);
				
				$rest->setParameter('marker', $nextMarker);
				
				if ($delimiter !== null && $delimiter !== '') $rest->setParameter('delimiter', $delimiter);
	
				if (($response = $rest->getResponse()) == false || $response->code !== 200) break;
				
				if ($returnCommonPrefixes && isset($response->body, $response->body->CommonPrefixes))
				{
					foreach ($response->body->CommonPrefixes as $c)
						$results[(string)$c->Prefix] = array('prefix' => (string)$c->Prefix);
				}
				
				if (isset($response->body, $response->body->Contents))
				{
					foreach ($response->body->Contents as $c)
					{
						$a = get_object_vars($c);
						
						$results[(string)$c->Name] = array(
							'name' => (string)$c->Name,
							'time' => strtotime((string)$a['Last-Modified']),
							'type' => (string)$a['Content-Type'],
							'owner' => (string)$a['Owner'],
							'size' => (int)$c->Size,
							//'hash' => substr((string)$c->ETag, 1, -1),
							'md5' => (string)$c->MD5,
							'sha1' => (string)$c->SHA1,
						);
						
						$nextMarker = (string)$c->Name;
					}
				}
				
				if (isset($response->body, $response->body->NextMarker))
					$nextMarker = (string)$response->body->NextMarker;
	
			} while ($response !== false && (bool)$response->body->IsTruncated == true);
		}

		return $results;
	}


	/**
	* Put a bucket
	*
	* @param string $bucket Bucket name
	* @param constant $acl ACL flag
	* @param string $location Set as "EU" to create buckets hosted in Europe
	* @return boolean
	*/
	public static function putBucket($bucket, $acl = self::ACL_PRIVATE, $location = false)
	{
		$rest = new SCSRequest('PUT', $bucket, '', self::$endpoint);
		$rest->setAmzHeader('x-amz-acl', $acl);

		if ($location !== false)
		{
			$dom = new DOMDocument;
			$createBucketConfiguration = $dom->createElement('CreateBucketConfiguration');
			$locationConstraint = $dom->createElement('LocationConstraint', $location);
			$createBucketConfiguration->appendChild($locationConstraint);
			$dom->appendChild($createBucketConfiguration);
			$rest->data = $dom->saveXML();
			$rest->size = strlen($rest->data);
			$rest->setHeader('Content-Type', 'application/xml');
		}
		$rest = $rest->getResponse();

		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::putBucket({$bucket}, {$acl}, {$location}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return true;
	}


	/**
	* Delete an empty bucket
	*
	* @param string $bucket Bucket name
	* @return boolean
	*/
	public static function deleteBucket($bucket)
	{
		$rest = new SCSRequest('DELETE', $bucket, '', self::$endpoint);
		$rest = $rest->getResponse();
		if ($rest->error === false && $rest->code !== 204)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::deleteBucket({$bucket}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return true;
	}
	
	
	/**
	* realFileSize()
	*
	* @param string $file Input file path
	* @return long file bytes
	*/
	public static function realFileSize($file)
	{
		$fp = fopen($file, 'rb');
		
	    $pos = 0;
	    $size = 1073741824;
	    fseek($fp, 0, SEEK_SET);
	    while ($size > 1)
	    {
	        fseek($fp, $size, SEEK_CUR);

	        if (fgetc($fp) === false)
	        {
	            fseek($fp, -$size, SEEK_CUR);
	            $size = (int)($size / 2);
	        }
	        else
	        {
	            fseek($fp, -1, SEEK_CUR);
	            $pos += $size;
	        }
	    }

	    while (fgetc($fp) !== false)  $pos++;
	
		fclose($fp);

	    return $pos;
	}


	/**
	* Create input info array for putObject()
	*
	* @param string $file Input file
	* @param mixed $md5sum Use MD5 hash (supply a string if you want to use your own)
	* @return array | false
	*/
	public static function inputFile($file, $md5sum = true)
	{
		if (!file_exists($file) || !is_file($file) || !is_readable($file))
		{
			self::__triggerError('SCS::inputFile(): Unable to open input file: '.$file, __FILE__, __LINE__);
			return false;
		}
		return array('file' => $file, 'size' => self::realFileSize($file), 'md5sum' => $md5sum !== false ?
		(is_string($md5sum) ? $md5sum : base64_encode(md5_file($file, true))) : '');
	}


	/**
	* Create input array info for putObject() with a resource
	*
	* @param string $resource Input resource to read from
	* @param integer $bufferSize Input byte size
	* @param string $md5sum MD5 hash to send (optional)
	* @return array | false
	*/
	public static function inputResource(&$resource, $bufferSize = false, $md5sum = '')
	{
		if (!is_resource($resource) || (int)$bufferSize < 0)
		{
			self::__triggerError('SCS::inputResource(): Invalid resource or buffer size', __FILE__, __LINE__);
			return false;
		}

		// Try to figure out the bytesize
		if ($bufferSize === false)
		{
			if (fseek($resource, 0, SEEK_END) < 0 || ($bufferSize = ftell($resource)) === false)
			{
				self::__triggerError('SCS::inputResource(): Unable to obtain resource size', __FILE__, __LINE__);
				return false;
			}
			fseek($resource, 0);
		}

		$input = array('size' => $bufferSize, 'md5sum' => $md5sum);
		$input['fp'] =& $resource;
		return $input;
	}
	
	/**
	* Create input array info for putObject() with a resource multipart
	*
	* @param string $resource Input resource to read from
	* @param integer $partSize
	* @param string $uploadId
	* @param integer $partNumber
	* @return array | false
	*/
	public static function inputResourceMultipart(&$resource, $partSize, $uploadId, $partNumber)
	{
		if (!is_resource($resource) || (int)$partSize <= 0)
		{
			self::__triggerError('SCS::inputResourceMultipart(): Invalid resource or part size', __FILE__, __LINE__);
			return false;
		}
		
		$data = fread($resource, $partSize);

		$input = array(
		
			'data' => $data,
			'md5sum' =>  base64_encode(md5($data, true))
		);
		
		$input['uploadId'] = $uploadId;
		$input['partNumber'] = $partNumber;
		
		return $input;
	}


	/**
	* Put an object
	*
	* @param mixed $input Input data
	* @param string $bucket Bucket name
	* @param string $uri Object URI
	* @param constant $acl ACL constant
	* @param array $metaHeaders Array of x-amz-meta-* headers
	* @param array $requestHeaders Array of request headers or content type as a string
	* @param constant $storageClass Storage class constant
	* @param constant $serverSideEncryption Server-side encryption
	* @return boolean | mixed
	*/
	public static function putObject($input, $bucket, $uri, $acl = self::ACL_PRIVATE, $metaHeaders = array(), $requestHeaders = array(), $storageClass = self::STORAGE_CLASS_STANDARD, $serverSideEncryption = self::SSE_NONE)
	{
		if ($input === false) return false;
		$rest = new SCSRequest('PUT', $bucket, $uri, self::$endpoint);

		if (!is_array($input)) $input = array(
			'data' => $input, 'size' => strlen($input),
			'md5sum' => base64_encode(md5($input, true))
		);

		// Data
		if (isset($input['fp']))
			$rest->fp =& $input['fp'];
		elseif (isset($input['file']))
			$rest->fp = @fopen($input['file'], 'rb');
		elseif (isset($input['data']))
			$rest->data = $input['data'];

		// Content-Length (required)
		if (isset($input['size']) && $input['size'] >= 0)
			$rest->size = $input['size'];
		else {
			if (isset($input['file']))
				$rest->size = self::realFileSize($input['file']);
			elseif (isset($input['data']))
				$rest->size = strlen($input['data']);
		}
		
		if (isset($input['uploadId'], $input['partNumber'])) {
			
			$rest->setParameter('uploadId', $input['uploadId']);
			$rest->setParameter('partNumber', $input['partNumber']);
		}

		// Custom request headers (Content-Type, Content-Disposition, Content-Encoding)
		if (is_array($requestHeaders))
			foreach ($requestHeaders as $h => $v) $rest->setHeader($h, $v);
		elseif (is_string($requestHeaders)) // Support for legacy contentType parameter
			$input['type'] = $requestHeaders;

		// Content-Type
		if (!isset($input['type']))
		{
			if (isset($requestHeaders['Content-Type']))
				$input['type'] =& $requestHeaders['Content-Type'];
			elseif (isset($input['file']))
				$input['type'] = self::__getMIMEType($input['file']);
			else
				$input['type'] = 'application/octet-stream';
		}

		if ($storageClass !== self::STORAGE_CLASS_STANDARD) // Storage class
			$rest->setAmzHeader('x-amz-storage-class', $storageClass);

		if ($serverSideEncryption !== self::SSE_NONE) // Server-side encryption
			$rest->setAmzHeader('x-amz-server-side-encryption', $serverSideEncryption);

		// We need to post with Content-Length and Content-Type, MD5 is optional
		if ($rest->size >= 0 && ($rest->fp !== false || $rest->data !== false))
		{
			$rest->setHeader('Content-Type', $input['type']);
			if (isset($input['md5sum'])) $rest->setHeader('Content-MD5', $input['md5sum']);

			$rest->setAmzHeader('x-amz-acl', $acl);
			foreach ($metaHeaders as $h => $v) $rest->setAmzHeader('x-amz-meta-'.$h, $v);
			$rest->getResponse();
		} else
			$rest->response->error = array('code' => 0, 'message' => 'Missing input parameters');

		if ($rest->response->error === false && $rest->response->code !== 200)
			$rest->response->error = array('code' => $rest->response->code, 'message' => 'Unexpected HTTP status');
		if ($rest->response->error !== false)
		{
			self::__triggerError(sprintf("SCS::putObject(): [%s] %s",
			$rest->response->error['code'], $rest->response->error['message']), __FILE__, __LINE__);
			return false;
		}
		
		if (isset($input['uploadId'], $input['partNumber'])) {
			
			return $rest->response->headers;
		}
		
		return true;
	}


	/**
	* Put an object from a file (legacy function)
	*
	* @param string $file Input file path
	* @param string $bucket Bucket name
	* @param string $uri Object URI
	* @param constant $acl ACL constant
	* @param array $metaHeaders Array of x-amz-meta-* headers
	* @param string $contentType Content type
	* @return boolean
	*/
	public static function putObjectFile($file, $bucket, $uri, $acl = self::ACL_PRIVATE, $metaHeaders = array(), $contentType = null)
	{
		return self::putObject(self::inputFile($file), $bucket, $uri, $acl, $metaHeaders, $contentType);
	}


	/**
	* Put an object from a string (legacy function)
	*
	* @param string $string Input data
	* @param string $bucket Bucket name
	* @param string $uri Object URI
	* @param constant $acl ACL constant
	* @param array $metaHeaders Array of x-amz-meta-* headers
	* @param string $contentType Content type
	* @return boolean
	*/
	public static function putObjectString($string, $bucket, $uri, $acl = self::ACL_PRIVATE, $metaHeaders = array(), $contentType = 'text/plain')
	{
		return self::putObject($string, $bucket, $uri, $acl, $metaHeaders, $contentType);
	}


	/**
	* Get an object
	*
	* @param string $bucket Bucket name
	* @param string $uri Object URI
	* @param mixed $saveTo Filename or resource to write to
	* @return mixed
	*/
	public static function getObject($bucket, $uri, $saveTo = false)
	{
		$rest = new SCSRequest('GET', $bucket, $uri, self::$endpoint);
		if ($saveTo !== false)
		{
			if (is_resource($saveTo))
				$rest->fp =& $saveTo;
			else
				if (($rest->fp = @fopen($saveTo, 'wb')) !== false)
					$rest->file = realpath($saveTo);
				else
					$rest->response->error = array('code' => 0, 'message' => 'Unable to open save file for writing: '.$saveTo);
		}
		if ($rest->response->error === false) $rest->getResponse();

		if ($rest->response->error === false && $rest->response->code !== 200)
			$rest->response->error = array('code' => $rest->response->code, 'message' => 'Unexpected HTTP status');
		if ($rest->response->error !== false)
		{
			self::__triggerError(sprintf("SCS::getObject({$bucket}, {$uri}): [%s] %s",
			$rest->response->error['code'], $rest->response->error['message']), __FILE__, __LINE__);
			return false;
		}
		return $rest->response;
	}


	/**
	* Get object information
	*
	* @param string $bucket Bucket name
	* @param string $uri Object URI
	* @param boolean $returnInfo Return response information
	* @return mixed | false
	*/
	public static function getObjectInfo($bucket, $uri, $returnInfo = true)
	{
		$rest = new SCSRequest('HEAD', $bucket, $uri, self::$endpoint);
		$rest = $rest->getResponse();
		if ($rest->error === false && ($rest->code !== 200 && $rest->code !== 404))
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::getObjectInfo({$bucket}, {$uri}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return $rest->code == 200 ? $returnInfo ? $rest->headers : true : false;
	}
	
	
	/**
	* Get Meta
	*
	* @param string $bucket Bucket name
	* @param string $uri Object URI
	* @return mixed | false
	*/
	public static function getMeta($bucket, $uri = '')
	{
		$rest = new SCSRequest('GET', $bucket, $uri, self::$endpoint);
		$rest->setParameter('meta', null);
		$rest = $rest->getResponse();
		if ($rest->error === false && ($rest->code !== 200 && $rest->code !== 404))
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::getMeta({$bucket}, {$uri}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return $rest->code == 200 ? $rest->body : false;
	}


	/**
	* Copy an object
	*
	* @param string $srcBucket Source bucket name
	* @param string $srcUri Source object URI
	* @param string $bucket Destination bucket name
	* @param string $uri Destination object URI
	* @param constant $acl ACL constant
	* @param array $metaHeaders Optional array of x-amz-meta-* headers
	* @param array $requestHeaders Optional array of request headers (content type, disposition, etc.)
	* @param constant $storageClass Storage class constant
	* @return mixed | false
	*/
	public static function copyObject($srcBucket, $srcUri, $bucket, $uri, $acl = self::ACL_PRIVATE, $metaHeaders = array(), $requestHeaders = array(), $storageClass = self::STORAGE_CLASS_STANDARD)
	{
		$rest = new SCSRequest('PUT', $bucket, $uri, self::$endpoint);
		$rest->setHeader('Content-Length', 0);
		foreach ($requestHeaders as $h => $v) $rest->setHeader($h, $v);
		foreach ($metaHeaders as $h => $v) $rest->setAmzHeader('x-amz-meta-'.$h, $v);
		if ($storageClass !== self::STORAGE_CLASS_STANDARD) // Storage class
			$rest->setAmzHeader('x-amz-storage-class', $storageClass);
		$rest->setAmzHeader('x-amz-acl', $acl);
		$rest->setAmzHeader('x-amz-copy-source', sprintf('/%s/%s', $srcBucket, rawurlencode($srcUri)));
		//$rest->setAmzHeader('x-amz-copy-source', sprintf('/%s/%s', $srcBucket, $srcUri));
		if (sizeof($requestHeaders) > 0 || sizeof($metaHeaders) > 0)
			$rest->setAmzHeader('x-amz-metadata-directive', 'REPLACE');

		$rest = $rest->getResponse();
		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::copyObject({$srcBucket}, {$srcUri}, {$bucket}, {$uri}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return true;
	}


	/**
	* Relax an object 秒传
	*
	* @param string $bucket Destination bucket name
	* @param string $uri Destination object URI
	* @param string $sha1 Destination object sha1
	* @param int64 $size Destination object size
	* @param constant $acl ACL constant
	* @param array $metaHeaders Optional array of x-amz-meta-* headers
	* @param array $requestHeaders Optional array of request headers (content type, disposition, etc.)
	* @param constant $storageClass Storage class constant
	* @return mixed | false
	*/
	public static function putObjectRelax($bucket, $uri, $sha1, $size, $acl = self::ACL_PRIVATE, $metaHeaders = array(), $requestHeaders = array(), $storageClass = self::STORAGE_CLASS_STANDARD)
	{
		$rest = new SCSRequest('PUT', $bucket, $uri, self::$endpoint);
		
		$rest->setParameter('relax', null);
		
		$rest->setHeader('Content-Length', 0);
		$rest->setHeader('s-sina-sha1', $sha1);
		$rest->setHeader('s-sina-length', $size);
		
		foreach ($requestHeaders as $h => $v) $rest->setHeader($h, $v);
		foreach ($metaHeaders as $h => $v) $rest->setAmzHeader('x-amz-meta-'.$h, $v);
		
		if ($storageClass !== self::STORAGE_CLASS_STANDARD) // Storage class
			$rest->setAmzHeader('x-amz-storage-class', $storageClass);
			
		$rest->setAmzHeader('x-amz-acl', $acl);

		$rest = $rest->getResponse();
		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::putObjectRelax({$bucket}, {$uri}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		
		return $rest->headers;
	}

	/**
	* Set up a bucket redirection
	*
	* @param string $bucket Bucket name
	* @param string $location Target host name
	* @return boolean
	*/
	public static function setBucketRedirect($bucket = NULL, $location = NULL)
	{
		$rest = new SCSRequest('PUT', $bucket, '', self::$endpoint);

		if( empty($bucket) || empty($location) ) {
			self::__triggerError("SCS::setBucketRedirect({$bucket}, {$location}): Empty parameter.", __FILE__, __LINE__);
			return false;
		}

		$dom = new DOMDocument;
		$websiteConfiguration = $dom->createElement('WebsiteConfiguration');
		$redirectAllRequestsTo = $dom->createElement('RedirectAllRequestsTo');
		$hostName = $dom->createElement('HostName', $location);
		$redirectAllRequestsTo->appendChild($hostName);
		$websiteConfiguration->appendChild($redirectAllRequestsTo);
		$dom->appendChild($websiteConfiguration);
		$rest->setParameter('website', null);
		$rest->data = $dom->saveXML();
		$rest->size = strlen($rest->data);
		$rest->setHeader('Content-Type', 'application/xml');
		$rest = $rest->getResponse();

		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::setBucketRedirect({$bucket}, {$location}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return true;
	}


	/**
	* Set logging for a bucket
	*
	* @param string $bucket Bucket name
	* @param string $targetBucket Target bucket (where logs are stored)
	* @param string $targetPrefix Log prefix (e,g; domain.com-)
	* @return boolean
	*/
	public static function setBucketLogging($bucket, $targetBucket, $targetPrefix = null)
	{
		// The SCS log delivery group has to be added to the target bucket's ACP
		if ($targetBucket !== null && ($acp = self::getAccessControlPolicy($targetBucket, '')) !== false)
		{
			// Only add permissions to the target bucket when they do not exist
			$aclWriteSet = false;
			$aclReadSet = false;
			foreach ($acp['acl'] as $acl)
			if ($acl['type'] == 'Group' && $acl['uri'] == 'http://acs.amazonaws.com/groups/s3/LogDelivery')
			{
				if ($acl['permission'] == 'WRITE') $aclWriteSet = true;
				elseif ($acl['permission'] == 'READ_ACP') $aclReadSet = true;
			}
			if (!$aclWriteSet) $acp['acl'][] = array(
				'type' => 'Group', 'uri' => 'http://acs.amazonaws.com/groups/s3/LogDelivery', 'permission' => 'WRITE'
			);
			if (!$aclReadSet) $acp['acl'][] = array(
				'type' => 'Group', 'uri' => 'http://acs.amazonaws.com/groups/s3/LogDelivery', 'permission' => 'READ_ACP'
			);
			if (!$aclReadSet || !$aclWriteSet) self::setAccessControlPolicy($targetBucket, '', $acp);
		}

		$dom = new DOMDocument;
		$bucketLoggingStatus = $dom->createElement('BucketLoggingStatus');
		$bucketLoggingStatus->setAttribute('xmlns', 'http://s3.amazonaws.com/doc/2006-03-01/');
		if ($targetBucket !== null)
		{
			if ($targetPrefix == null) $targetPrefix = $bucket . '-';
			$loggingEnabled = $dom->createElement('LoggingEnabled');
			$loggingEnabled->appendChild($dom->createElement('TargetBucket', $targetBucket));
			$loggingEnabled->appendChild($dom->createElement('TargetPrefix', $targetPrefix));
			// TODO: Add TargetGrants?
			$bucketLoggingStatus->appendChild($loggingEnabled);
		}
		$dom->appendChild($bucketLoggingStatus);

		$rest = new SCSRequest('PUT', $bucket, '', self::$endpoint);
		$rest->setParameter('logging', null);
		$rest->data = $dom->saveXML();
		$rest->size = strlen($rest->data);
		$rest->setHeader('Content-Type', 'application/xml');
		$rest = $rest->getResponse();
		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::setBucketLogging({$bucket}, {$targetBucket}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return true;
	}


	/**
	* Get logging status for a bucket
	*
	* This will return false if logging is not enabled.
	* Note: To enable logging, you also need to grant write access to the log group
	*
	* @param string $bucket Bucket name
	* @return array | false
	*/
	public static function getBucketLogging($bucket)
	{
		$rest = new SCSRequest('GET', $bucket, '', self::$endpoint);
		$rest->setParameter('logging', null);
		$rest = $rest->getResponse();
		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::getBucketLogging({$bucket}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		if (!isset($rest->body->LoggingEnabled)) return false; // No logging
		return array(
			'targetBucket' => (string)$rest->body->LoggingEnabled->TargetBucket,
			'targetPrefix' => (string)$rest->body->LoggingEnabled->TargetPrefix,
		);
	}


	/**
	* Disable bucket logging
	*
	* @param string $bucket Bucket name
	* @return boolean
	*/
	public static function disableBucketLogging($bucket)
	{
		return self::setBucketLogging($bucket, null);
	}


	/**
	* Get a bucket's location
	*
	* @param string $bucket Bucket name
	* @return string | false
	*/
	public static function getBucketLocation($bucket)
	{
		$rest = new SCSRequest('GET', $bucket, '', self::$endpoint);
		$rest->setParameter('location', null);
		$rest = $rest->getResponse();
		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::getBucketLocation({$bucket}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return (isset($rest->body[0]) && (string)$rest->body[0] !== '') ? (string)$rest->body[0] : 'US';
	}


	/**
	* Set object or bucket Access Control Policy
	*
	* @param string $bucket Bucket name
	* @param string $uri Object URI
	* @param array $acp Access Control Policy Data (same as the data returned from getAccessControlPolicy)
	* @return boolean
	*/
	public static function setAccessControlPolicy($bucket, $uri = '', $acp = array())
	{
		/*
		$dom = new DOMDocument;
		$dom->formatOutput = true;
		$accessControlPolicy = $dom->createElement('AccessControlPolicy');
		$accessControlList = $dom->createElement('AccessControlList');

		// It seems the owner has to be passed along too
		$owner = $dom->createElement('Owner');
		$owner->appendChild($dom->createElement('ID', $acp['owner']['id']));
		$owner->appendChild($dom->createElement('DisplayName', $acp['owner']['name']));
		$accessControlPolicy->appendChild($owner);

		foreach ($acp['acl'] as $g)
		{
			$grant = $dom->createElement('Grant');
			$grantee = $dom->createElement('Grantee');
			$grantee->setAttribute('xmlns:xsi', 'http://www.w3.org/2001/XMLSchema-instance');
			if (isset($g['id']))
			{ // CanonicalUser (DisplayName is omitted)
				$grantee->setAttribute('xsi:type', 'CanonicalUser');
				$grantee->appendChild($dom->createElement('ID', $g['id']));
			}
			elseif (isset($g['email']))
			{ // AmazonCustomerByEmail
				$grantee->setAttribute('xsi:type', 'AmazonCustomerByEmail');
				$grantee->appendChild($dom->createElement('EmailAddress', $g['email']));
			}
			elseif ($g['type'] == 'Group')
			{ // Group
				$grantee->setAttribute('xsi:type', 'Group');
				$grantee->appendChild($dom->createElement('URI', $g['uri']));
			}
			$grant->appendChild($grantee);
			$grant->appendChild($dom->createElement('Permission', $g['permission']));
			$accessControlList->appendChild($grant);
		}

		$accessControlPolicy->appendChild($accessControlList);
		$dom->appendChild($accessControlPolicy);
		*/

		$rest = new SCSRequest('PUT', $bucket, $uri, self::$endpoint);
		$rest->setParameter('acl', null);
		//$rest->data = $dom->saveXML();
		$rest->data = json_encode($acp);
		$rest->size = strlen($rest->data);
		//$rest->setHeader('Content-Type', 'application/xml');
		$rest->setHeader('Content-Type', 'application/json');
		$rest = $rest->getResponse();
		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::setAccessControlPolicy({$bucket}, {$uri}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return true;
	}


	/**
	* Get object or bucket Access Control Policy
	*
	* @param string $bucket Bucket name
	* @param string $uri Object URI
	* @return mixed | false
	*/
	public static function getAccessControlPolicy($bucket, $uri = '')
	{
		$rest = new SCSRequest('GET', $bucket, $uri, self::$endpoint);
		$rest->setParameter('acl', null);
		$rest = $rest->getResponse();
		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::getAccessControlPolicy({$bucket}, {$uri}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}

		$acp = array();
		
		/*
		if (isset($rest->body->Owner, $rest->body->Owner->ID, $rest->body->Owner->DisplayName))
			$acp['owner'] = array(
				'id' => (string)$rest->body->Owner->ID, 'name' => (string)$rest->body->Owner->DisplayName
			);

		if (isset($rest->body->AccessControlList))
		{
			$acp['acl'] = array();
			foreach ($rest->body->AccessControlList->Grant as $grant)
			{
				foreach ($grant->Grantee as $grantee)
				{
					if (isset($grantee->ID, $grantee->DisplayName)) // CanonicalUser
						$acp['acl'][] = array(
							'type' => 'CanonicalUser',
							'id' => (string)$grantee->ID,
							'name' => (string)$grantee->DisplayName,
							'permission' => (string)$grant->Permission
						);
					elseif (isset($grantee->EmailAddress)) // AmazonCustomerByEmail
						$acp['acl'][] = array(
							'type' => 'AmazonCustomerByEmail',
							'email' => (string)$grantee->EmailAddress,
							'permission' => (string)$grant->Permission
						);
					elseif (isset($grantee->URI)) // Group
						$acp['acl'][] = array(
							'type' => 'Group',
							'uri' => (string)$grantee->URI,
							'permission' => (string)$grant->Permission
						);
					else continue;
				}
			}
		}
		*/
		
		if (isset($rest->body->Owner))
		{
			$acp['owner'] = $rest->body->Owner;
		}
		
		if (isset($rest->body->ACL)) {
			
			$acp['acl'] = get_object_vars($rest->body->ACL);
		}
		
		return $acp;
	}


	/**
	* Delete an object
	*
	* @param string $bucket Bucket name
	* @param string $uri Object URI
	* @return boolean
	*/
	public static function deleteObject($bucket, $uri)
	{
		$rest = new SCSRequest('DELETE', $bucket, $uri, self::$endpoint);
		$rest = $rest->getResponse();
		if ($rest->error === false && $rest->code !== 204)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::deleteObject(): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return true;
	}


	/**
	* Get a query string authenticated URL
	*
	* @param string $bucket Bucket name
	* @param string $uri Object URI
	* @param integer $lifetime Lifetime in seconds
	* @param boolean $hostBucket Use the bucket name as the hostname
	* @param boolean $https Use HTTPS ($hostBucket should be false for SSL verification)
	* @param string $ip
	* @param string $verb
	* @param string $content_type For PUT
	* @return string
	*/
	
	/*
	public static function getAuthenticatedURL($bucket, $uri, $lifetime, $hostBucket = false, $https = false)
	{
		$expires = self::__getTime() + $lifetime;
		$uri = str_replace(array('%2F', '%2B'), array('/', '+'), rawurlencode($uri));
		return sprintf(($https ? 'https' : 'http').'://%s/%s?AWSAccessKeyId=%s&Expires=%u&Signature=%s',
		// $hostBucket ? $bucket : $bucket.'.s3.amazonaws.com', $uri, self::$__accessKey, $expires,
		$hostBucket ? $bucket : self::$endpoint.'/'.$bucket, $uri, self::$__accessKey, $expires,
		urlencode(self::__getHash("GET\n\n\n{$expires}\n/{$bucket}/{$uri}")));
	}
	*/
	
	public static function getAuthenticatedURL($bucket, $uri, $lifetime, $hostBucket = false, $https = false, $ip=null, $verb=null, $content_type=null)
	{
		$expires = self::__getTime() + $lifetime;
		$uri = str_replace(array('%2F'), array('/'), rawurlencode($uri));
		//$uri = str_replace(array('%2F', '%2B'), array('/', '+'), rawurlencode($uri));
		
		if (!$verb || !in_array($verb, array('GET', 'POST', 'PUT', 'HEAD', 'DELETE', 'OPTIONS')))
		{
			$verb = 'GET';
		}
		
		if ($verb != 'POST' && $verb != 'PUT')
		{
			$content_type = null;
		}
		
		if (!$content_type)
		{
			$content_type = '';
		}
		
		
		if ( !$bucket ) 
		{
					
			return sprintf(($https ? 'https' : 'http') . '://%s/?' . ($ip ? 'ip=' . $ip . '&' : '') . 'KID=%s&Expires=%u&ssig=%s',
					self::$endpoint, 
					'sina,' . self::$__accessKey, 
					$expires,
					urlencode(self::__getHash("{$verb}\n\n{$content_type}\n{$expires}\n/" . ($ip ? '?ip=' . $ip : ''))));
		}
		
		return sprintf(($https ? 'https' : 'http').'://%s/%s?' . ($ip ? 'ip=' . $ip . '&' : '') . 'KID=%s&Expires=%u&ssig=%s',
		$hostBucket ? $bucket : self::$endpoint.'/'.$bucket, $uri, 'sina,' . self::$__accessKey, $expires,
		urlencode(self::__getHash("{$verb}\n\n{$content_type}\n{$expires}\n/{$bucket}/{$uri}" . ($ip ? '?ip=' . $ip : ''))));
	}
	

	/**
	* Get upload POST parameters for form uploads
	*
	* @param string $bucket Bucket name
	* @param string $uriPrefix Object URI prefix
	* @param constant $acl ACL constant
	* @param integer $lifetime Lifetime in seconds
	* @param integer $maxFileSize Maximum filesize in bytes (default 5MB)
	* @param string $successRedirect Redirect URL or 200 / 201 status code
	* @param array $amzHeaders Array of x-amz-meta-* headers
	* @param array $headers Array of request headers or content type as a string
	* @param boolean $flashVars Includes additional "Filename" variable posted by Flash
	* @return object
	*/
	public static function getHttpUploadPostParams($bucket, $uriPrefix = '', $acl = self::ACL_PRIVATE, $lifetime = 3600,
	$maxFileSize = 5242880, $successRedirect = "201", $amzHeaders = array(), $headers = array(), $flashVars = false)
	{
		// Create policy object
		$policy = new stdClass;
		$policy->expiration = gmdate('Y-m-d\TH:i:s.000\Z', (self::__getTime() + $lifetime));
		$policy->conditions = array();
		$obj = new stdClass; $obj->bucket = $bucket; array_push($policy->conditions, $obj);
		$obj = new stdClass; $obj->acl = $acl; array_push($policy->conditions, $obj);

		$obj = new stdClass; // 200 for non-redirect uploads
		if (is_numeric($successRedirect) && in_array((int)$successRedirect, array(200, 201)))
			$obj->success_action_status = (string)$successRedirect;
		else // URL
			$obj->success_action_redirect = $successRedirect;
		//array_push($policy->conditions, $obj);

		if ($acl !== self::ACL_PUBLIC_READ)
			array_push($policy->conditions, array('eq', '$acl', $acl));

		array_push($policy->conditions, array('starts-with', '$key', $uriPrefix));
		if ($flashVars) array_push($policy->conditions, array('starts-with', '$Filename', ''));
		foreach (array_keys($headers) as $headerKey)
			array_push($policy->conditions, array('starts-with', '$'.$headerKey, ''));
		foreach ($amzHeaders as $headerKey => $headerVal)
		{
			$obj = new stdClass;
			$obj->{$headerKey} = (string)$headerVal;
			array_push($policy->conditions, $obj);
		}
		array_push($policy->conditions, array('content-length-range', 0, $maxFileSize));
		$policy = base64_encode(str_replace('\/', '/', json_encode($policy)));

		// Create parameters
		$params = new stdClass;
		//$params->AWSAccessKeyId = 'SINA000000' . strtoupper(self::$__accessKey);
		$params->AWSAccessKeyId = self::$__accessKey;
		$params->key = $uriPrefix.'${filename}';
		$params->acl = $acl;
		$params->policy = $policy; unset($policy);
		$params->signature = self::__getHashRaw($params->policy);
		if (is_numeric($successRedirect) && in_array((int)$successRedirect, array(200, 201)))
			$params->success_action_status = (string)$successRedirect;
		else
			$params->success_action_redirect = $successRedirect;
		foreach ($headers as $headerKey => $headerVal) $params->{$headerKey} = (string)$headerVal;
		foreach ($amzHeaders as $headerKey => $headerVal) $params->{$headerKey} = (string)$headerVal;
		
		$params->Policy = $params->policy;
		unset($params->policy);
		
		$params->Signature = $params->signature;
		unset($params->signature);
		
		return $params;
	}
	
	
	
	/**
	* Initiate Multipart Upload
	*
	* @param string $bucket Destination bucket name
	* @param string $uri Destination object URI
	* @param constant $acl ACL constant
	* @param array $metaHeaders Optional array of x-amz-meta-* headers
	* @param array $requestHeaders Optional array of request headers (content type, disposition, etc.)
	* @param constant $storageClass Storage class constant
	* @return mixed | false
	*/
	public static function initiateMultipartUpload($bucket, $uri, $acl = self::ACL_PRIVATE, $metaHeaders = array(), $requestHeaders = array(), $storageClass = self::STORAGE_CLASS_STANDARD)
	{
		$rest = new SCSRequest('POST', $bucket, $uri, self::$endpoint);
		$rest->setParameter('multipart', null);
		$rest->setHeader('Content-Length', 0);
		
		// Custom request headers (Content-Type, Content-Disposition, Content-Encoding)
		if (is_array($requestHeaders))
			foreach ($requestHeaders as $h => $v) $rest->setHeader($h, $v);
		elseif (is_string($requestHeaders)) // Support for legacy contentType parameter
			$rest->setHeader('Content-Type', $requestHeaders);
		
		foreach ($metaHeaders as $h => $v) $rest->setAmzHeader('x-amz-meta-'.$h, $v);
		if ($storageClass !== self::STORAGE_CLASS_STANDARD) // Storage class
			$rest->setAmzHeader('x-amz-storage-class', $storageClass);
		$rest->setAmzHeader('x-amz-acl', $acl);
		
		// Content-Type
		if (!isset($requestHeaders['Content-Type']))
		{
			$rest->setHeader('Content-Type', self::__getMIMEType($uri));
		}

		$rest = $rest->getResponse();
		
		//print_r($rest);
		
		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::initiateMultipartUpload({$bucket}, {$uri}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		
		//print_r($rest->body);
		
		return isset($rest->body->UploadId) ? array(
		
			'bucket' => $rest->body->Bucket,
			'key' => $rest->body->Key,
			'upload_id' => $rest->body->UploadId,
		
		) : false;
	}


	/**
	* List Parts
	*
	* @param string $bucket Bucket name
	* @param string $uri Object URI
	* @param string $uploadId
	* @return mixed | false
	*/
	public static function listParts($bucket, $uri, $uploadId)
	{
		$rest = new SCSRequest('GET', $bucket, $uri, self::$endpoint);
		$rest->setParameter('uploadId', $uploadId);
		$response = $rest->getResponse();
		if ($response->error === false && $response->code !== 200)
			$response->error = array('code' => $response->code, 'message' => 'Unexpected HTTP status');
		if ($response->error !== false)
		{
			self::__triggerError(sprintf("SCS::listParts({$bucket}, {$uri}, {$uploadId}): [%s] %s",
			$response->error['code'], $response->error['message']), __FILE__, __LINE__);
			return false;
		}
		
		$results = array();
		
		if (isset($response->body, $response->body->Parts))
		{
			foreach ($response->body->Parts as $c)
			{
				$a = get_object_vars($c);
					
				$results[intval($c->PartNumber)] = array(
				
					'part_number' => intval($c->PartNumber),
					'time' => strtotime((string)$a['Last-Modified']),
					'size' => (int)$c->Size,
					'etag' => (string)$c->ETag
				);
			}
		}

		return $results;
	}
	
	
	
	/**
	* Complete Multipart Upload
	*
	* @param string $bucket Bucket name
	* @param string $uri Object URI
	* @param string $uploadId
	* @return boolean
	*/
	public static function completeMultipartUpload($bucket, $uri, $uploadId, $parts)
	{
		$rest = new SCSRequest('POST', $bucket, $uri, self::$endpoint);
		$rest->setParameter('uploadId', $uploadId);
		
		if (true) //使用json格式
		{
			$rest->setHeader('Content-Type', 'application/json');
			$rest->data = json_encode($parts);
		}
		else
		{
			$dom = new DOMDocument;			
			$dom->formatOutput = true;
			$createCompleteMultipartUpload = $dom->createElement('CompleteMultipartUpload');
			$dom->appendChild($createCompleteMultipartUpload);
			
			foreach ($parts as $part)
			{	
				$createPart = $dom->createElement('Part');
				$createCompleteMultipartUpload->appendChild($createPart);
				$createPart->appendChild($dom->createElement('PartNumber', $part['PartNumber']));
				$createPart->appendChild($dom->createElement('ETag', $part['ETag']));
			}
	
			$rest->removeParameter('formatter');
			$rest->setHeader('Content-Type', 'application/xml');
			$rest->data = $dom->saveXML();
		}
		
		$rest->size = strlen($rest->data);
		
		$rest = $rest->getResponse();
		
		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			self::__triggerError(sprintf("SCS::completeMultipartUpload({$bucket}, {$uri}, {$uploadId}, {$parts}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			
			return false;
		}
		
		return true;
	}



	/**
	* Get MIME type for file
	*
	* To override the putObject() Content-Type, add it to $requestHeaders
	*
	* To use fileinfo, ensure the MAGIC environment variable is set
	*
	* @internal Used to get mime types
	* @param string &$file File path
	* @return string
	*/
	private static function __getMIMEType(&$file)
	{
		static $exts = array(
			'jpg' => 'image/jpeg', 'jpeg' => 'image/jpeg', 'gif' => 'image/gif',
			'png' => 'image/png', 'ico' => 'image/x-icon', 'pdf' => 'application/pdf',
			'tif' => 'image/tiff', 'tiff' => 'image/tiff', 'svg' => 'image/svg+xml',
			'svgz' => 'image/svg+xml', 'swf' => 'application/x-shockwave-flash', 
			'zip' => 'application/zip', 'gz' => 'application/x-gzip',
			'tar' => 'application/x-tar', 'bz' => 'application/x-bzip',
			'bz2' => 'application/x-bzip2',  'rar' => 'application/x-rar-compressed',
			'exe' => 'application/x-msdownload', 'msi' => 'application/x-msdownload',
			'cab' => 'application/vnd.ms-cab-compressed', 'txt' => 'text/plain',
			'asc' => 'text/plain', 'htm' => 'text/html', 'html' => 'text/html',
			'css' => 'text/css', 'js' => 'text/javascript',
			'xml' => 'text/xml', 'xsl' => 'application/xsl+xml',
			'ogg' => 'application/ogg', 'mp3' => 'audio/mpeg', 'wav' => 'audio/x-wav',
			'avi' => 'video/x-msvideo', 'mpg' => 'video/mpeg', 'mpeg' => 'video/mpeg',
			'mov' => 'video/quicktime', 'flv' => 'video/x-flv', 'php' => 'text/x-php'
		);

		$ext = strtolower(pathinfo($file, PATHINFO_EXTENSION));
		if (isset($exts[$ext])) return $exts[$ext];

		// Use fileinfo if available
		if (extension_loaded('fileinfo') && isset($_ENV['MAGIC']) &&
		($finfo = finfo_open(FILEINFO_MIME, $_ENV['MAGIC'])) !== false)
		{
			if (($type = finfo_file($finfo, $file)) !== false)
			{
				// Remove the charset and grab the last content-type
				$type = explode(' ', str_replace('; charset=', ';charset=', $type));
				$type = array_pop($type);
				$type = explode(';', $type);
				$type = trim(array_shift($type));
			}
			finfo_close($finfo);
			if ($type !== false && strlen($type) > 0) return $type;
		}

		return 'application/octet-stream';
	}


	/**
	* Get the current time
	*
	* @internal Used to apply offsets to sytem time
	* @return integer
	*/
	public static function __getTime()
	{
		return time() + self::$__timeOffset;
	}


	/**
	* Generate the auth string: "SINA AccessKey:Signature"
	*
	* @internal Used by SCSRequest::getResponse()
	* @param string $string String to sign
	* @return string
	*/
	public static function __getSignature($string)
	{
		return 'SINA '.self::$__accessKey.':'.self::__getHash($string);
	}


	/**
	* Creates a HMAC-SHA1 hash
	*
	* This uses the hash extension if loaded
	*
	* @internal Used by __getSignature()
	* @param string $string String to sign
	* @return string
	*/
	private static function __getHash($string)
	{
	
		
		return  substr( self::__getHashRaw($string), 5, 10 ) ;
		
		/*
		return base64_encode(extension_loaded('hash') ?
		hash_hmac('sha1', $string, self::$__secretKey, true) : pack('H*', sha1(
		(str_pad(self::$__secretKey, 64, chr(0x00)) ^ (str_repeat(chr(0x5c), 64))) .
		pack('H*', sha1((str_pad(self::$__secretKey, 64, chr(0x00)) ^
		(str_repeat(chr(0x36), 64))) . $string)))));
		*/
	}
	
	
	/**
	* Creates a HMAC-SHA1 hash
	*
	* This uses the hash extension if loaded
	*
	* @internal Used by __getHash()
	* @param string $string String to sign
	* @return string
	*/
	private static function __getHashRaw($string)
	{
		return  base64_encode( hash_hmac( "sha1", $string, self::$__secretKey, true ) );
	}

}

/**
 * SCS Request class 
 *
 * @link http://weibo.com/smcz
 * @version 0.1.0-dev
 */
final class SCSRequest
{
	/**
	 * SCS URI
	 *
	 * @var string
	 * @access pricate
	 */
	private $endpoint;
	
	/**
	 * Verb
	 *
	 * @var string
	 * @access private
	 */
	private $verb;
	
	/**
	 * SCS bucket name
	 *
	 * @var string
	 * @access private
	 */
	private $bucket;
	
	/**
	 * Object URI
	 *
	 * @var string
	 * @access private
	 */
	private $uri;
	
	/**
	 * Final object URI
	 *
	 * @var string
	 * @access private
	 */
	private $resource = '';
	
	/**
	 * Additional request parameters
	 *
	 * @var array
	 * @access private
	 */
	private $parameters = array();
	
	/**
	 * Amazon specific request headers
	 *
	 * @var array
	 * @access private
	 */
	private $amzHeaders = array();

	/**
	 * HTTP request headers
	 *
	 * @var array
	 * @access private
	 */
	private $headers = array(
		'Host' => '', 'Date' => '', 'Content-MD5' => '', 'Content-Type' => ''
	);

	/**
	 * Use HTTP PUT?
	 *
	 * @var bool
	 * @access public
	 */
	public $fp = false;

	/**
	 * PUT file size
	 *
	 * @var int
	 * @access public
	 */
	public $size = 0;

	/**
	 * PUT post fields
	 *
	 * @var array
	 * @access public
	 */
	public $data = false;

	/**
	 * SCS request respone
	 *
	 * @var object
	 * @access public
	 */
	public $response;


	/**
	* Constructor
	*
	* @param string $verb Verb
	* @param string $bucket Bucket name
	* @param string $uri Object URI
	* @param string $endpoint SCS endpoint URI
	* @return mixed
	*/
	function __construct($verb, $bucket = '', $uri = '', $endpoint = 'sinacloud.net')
	{
		
		$this->endpoint = $endpoint;
		$this->verb = $verb;
		$this->bucket = $bucket;
		$this->uri = $uri !== '' ? '/'.str_replace('%2F', '/', rawurlencode($uri)) : '/';

		//if ($this->bucket !== '')
		//	$this->resource = '/'.$this->bucket.$this->uri;
		//else
		//	$this->resource = $this->uri;

		if ($this->bucket !== '')
		{
			if ($this->__dnsBucketName($this->bucket))
			{
				$this->headers['Host'] = $this->bucket.'.'.$this->endpoint;
				$this->resource = '/'.$this->bucket.$this->uri;
			}
			else
			{
				$this->headers['Host'] = $this->endpoint;
				$this->uri = $this->uri;
				if ($this->bucket !== '') $this->uri = '/'.$this->bucket.$this->uri;
				$this->bucket = '';
				$this->resource = $this->uri;
			}
		}
		else
		{
			$this->headers['Host'] = $this->endpoint;
			$this->resource = $this->uri;
		}


		//$this->headers['Date'] = gmdate('D, d M Y H:i:s T');
		$this->headers['Date'] = gmdate('D, d M Y H:i:s T', SCS::__getTime());
		$this->response = new STDClass;
		$this->response->error = false;
		$this->response->body = null;
		$this->response->headers = array();
		$this->setParameter('formatter', 'json');
	}


	/**
	* Set request parameter
	*
	* @param string $key Key
	* @param string $value Value
	* @return void
	*/
	public function setParameter($key, $value)
	{
		$this->parameters[$key] = $value;
	}
	
	/**
	* Remove request parameter
	*
	* @param string $key Key
	* @return void
	*/
	public function removeParameter($key)
	{
		 unset($this->parameters[$key]);
	}


	/**
	* Set request header
	*
	* @param string $key Key
	* @param string $value Value
	* @return void
	*/
	public function setHeader($key, $value)
	{
		$this->headers[$key] = $value;
	}


	/**
	* Set x-amz-meta-* header
	*
	* @param string $key Key
	* @param string $value Value
	* @return void
	*/
	public function setAmzHeader($key, $value)
	{
		$this->amzHeaders[$key] = $value;
	}


	/**
	* Get the SCS response
	*
	* @return object | false
	*/
	public function getResponse()
	{
		$query = '';
		if (sizeof($this->parameters) > 0)
		{
			$query = substr($this->uri, -1) !== '?' ? '?' : '&';
			foreach ($this->parameters as $var => $value)
			{
				if ($value == null || $value == '') 
					$query .= $var.'&';
				else 
					$query .= $var.'='.rawurlencode($value).'&';
			}
				
			$query = substr($query, 0, -1);
			$this->uri .= $query;
			
			/*
			if (array_key_exists('acl', $this->parameters) ||
				array_key_exists('location', $this->parameters) ||
				array_key_exists('torrent', $this->parameters) ||
				array_key_exists('website', $this->parameters) ||
				array_key_exists('logging', $this->parameters))
			{
				$this->resource .= $query;
			}
			*/
			
			$single_filter_list = array('acl', 'location', 'torrent', 'website', 'logging', 'relax', 'meta', 'uploads', 'part', 'copy', 'multipart');
			$double_filter_list = array('uploadId', 'ip', 'partNumber');
			
			foreach ($this->parameters as $var => $value)
			{
				if (in_array($var, $single_filter_list)) {

					$this->resource .= '?' . $var;
					break;
				}
			}
			
			$query_for_sign_list = array();
			
			foreach ($this->parameters as $var => $value)
			{
				if (in_array($var, $double_filter_list)) {

					$query_for_sign_list[$var] = $value;
				}
			}
			
			if (count($query_for_sign_list) > 0) 
			{
				ksort($query_for_sign_list);
				
				$query_for_sign = '';
				
				foreach ($query_for_sign_list as $key => $value)
				{
					$query_for_sign .= $key.'='.rawurlencode($value).'&';
				}
				
				$query_for_sign = substr($query_for_sign, 0, -1);
				
				if ($query_for_sign)
				{
					$this->resource .= (strpos($this->resource, '?') === false ? '?' : '&') . $query_for_sign;
				}
			}
	
			
		}
		
		$url = (SCS::$useSSL ? 'https://' : 'http://') . ($this->headers['Host'] !== '' ? $this->headers['Host'] : $this->endpoint) . $this->uri;
		
		/* @TODO delete */
		
		//$url = (SCS::$useSSL ? 'https://' : 'http://') . '58.63.236.206' . $this->uri;
		

		//var_dump('bucket: ' . $this->bucket, 'uri: ' . $this->uri, 'resource: ' . $this->resource, 'url: ' . $url);

		// Basic setup
		$curl = curl_init();
		curl_setopt($curl, CURLOPT_USERAGENT, 'SCS/console');

		if (SCS::$useSSL)
		{
			// SSL Validation can now be optional for those with broken OpenSSL installations
			curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, SCS::$useSSLValidation ? 2 : 0);
			curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, SCS::$useSSLValidation ? 1 : 0);

			if (SCS::$sslKey !== null) curl_setopt($curl, CURLOPT_SSLKEY, SCS::$sslKey);
			if (SCS::$sslCert !== null) curl_setopt($curl, CURLOPT_SSLCERT, SCS::$sslCert);
			if (SCS::$sslCACert !== null) curl_setopt($curl, CURLOPT_CAINFO, SCS::$sslCACert);
		}

		curl_setopt($curl, CURLOPT_URL, $url);

		if (SCS::$proxy != null && isset(SCS::$proxy['host']))
		{
			curl_setopt($curl, CURLOPT_PROXY, SCS::$proxy['host']);
			curl_setopt($curl, CURLOPT_PROXYTYPE, SCS::$proxy['type']);
			if (isset(SCS::$proxy['user'], SCS::$proxy['pass']) && SCS::$proxy['user'] != null && SCS::$proxy['pass'] != null)
				curl_setopt($curl, CURLOPT_PROXYUSERPWD, sprintf('%s:%s', SCS::$proxy['user'], SCS::$proxy['pass']));
		}

		// Headers
		$headers = array(); $amz = array();
		foreach ($this->amzHeaders as $header => $value)
			if (strlen($value) > 0) $headers[] = $header.': '.$value;
		foreach ($this->headers as $header => $value)
			if (strlen($value) > 0) $headers[] = $header.': '.$value;

		// Collect AMZ headers for signature
		foreach ($this->amzHeaders as $header => $value)
			if (strlen($value) > 0) $amz[] = strtolower($header).':'.$value;

		// AMZ headers must be sorted
		if (sizeof($amz) > 0)
		{
			//sort($amz);
			usort($amz, array(&$this, '__sortMetaHeadersCmp'));
			$amz = "\n".implode("\n", $amz);
		} else $amz = '';

		if (SCS::hasAuth())
		{
			// Authorization string (CloudFront stringToSign should only contain a date)
			if ($this->headers['Host'] == 'cloudfront.amazonaws.com')
				$headers[] = 'Authorization: ' . SCS::__getSignature($this->headers['Date']);
			else
			{
				
				if (isset($this->headers['s-sina-sha1'])) {
					$this->headers['Content-MD5'] = $this->headers['s-sina-sha1'];
				}
				
				$headers[] = 'Authorization: ' . SCS::__getSignature(
					$this->verb."\n".
					$this->headers['Content-MD5']."\n".
					$this->headers['Content-Type']."\n".
					$this->headers['Date'].$amz."\n".
					$this->resource
				);
			}
		}

		/* @todo delete */
		//$headers[] = 'Host: ' . ($this->headers['Host'] !== '' ? $this->headers['Host'] : $this->endpoint);
		//print_r($headers);

		curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
		curl_setopt($curl, CURLOPT_HEADER, false);
		curl_setopt($curl, CURLOPT_RETURNTRANSFER, false);
		curl_setopt($curl, CURLOPT_WRITEFUNCTION, array(&$this, '__responseWriteCallback'));
		curl_setopt($curl, CURLOPT_HEADERFUNCTION, array(&$this, '__responseHeaderCallback'));
		curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
		
		/* 必要时设置超时时间
		curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 60);
		curl_setopt($curl, CURLOPT_TIMEOUT, 1200);
		*/
		
		// Request types
		switch ($this->verb)
		{
			case 'GET': break;
			case 'PUT': case 'POST': // POST only used for CloudFront
				if ($this->fp !== false)
				{
					curl_setopt($curl, CURLOPT_PUT, true);
					curl_setopt($curl, CURLOPT_INFILE, $this->fp);
					if ($this->size >= 0)
						curl_setopt($curl, CURLOPT_INFILESIZE, $this->size);
				}
				elseif ($this->data !== false)
				{
					curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $this->verb);
					curl_setopt($curl, CURLOPT_POSTFIELDS, $this->data);
				}
				else
					curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $this->verb);
			break;
			case 'HEAD':
				curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'HEAD');
				curl_setopt($curl, CURLOPT_NOBODY, true);
			break;
			case 'DELETE':
				curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'DELETE');
			break;
			default: break;
		}

		// Execute, grab errors
		if (curl_exec($curl))
			$this->response->code = curl_getinfo($curl, CURLINFO_HTTP_CODE);
		else
			$this->response->error = array(
				'code' => curl_errno($curl),
				'message' => curl_error($curl),
				'resource' => $this->resource
			);
			
		//echo $this->response->body;
		@curl_close($curl);

		// Parse body into XML | JSON
		if ($this->response->error === false && isset($this->response->headers['type']) &&
		($this->response->headers['type'] == 'application/xml' || $this->response->headers['type'] == 'application/json') && isset($this->response->body))
		{
			if ($this->response->headers['type'] == 'application/json')
			{
				$this->response->body = json_decode($this->response->body);
			} 
			else
			{
				$this->response->body = simplexml_load_string($this->response->body);
			}

			// Grab SCS errors
			if (!in_array($this->response->code, array(200, 204, 206)) &&
			isset($this->response->body->Code, $this->response->body->Message))
			{
				$this->response->error = array(
					'code' => (string)$this->response->body->Code,
					'message' => (string)$this->response->body->Message
				);
				if (isset($this->response->body->Resource))
					$this->response->error['resource'] = (string)$this->response->body->Resource;
				unset($this->response->body);
			}
		}

		// Clean up file resources
		if ($this->fp !== false && is_resource($this->fp)) fclose($this->fp);

		return $this->response;
	}

	/**
	* Sort compare for meta headers
	*
	* @internal Used to sort x-amz meta headers
	* @param string $a String A
	* @param string $b String B
	* @return integer
	*/
	private function __sortMetaHeadersCmp($a, $b)
	{
		$lenA = strpos($a, ':');
		$lenB = strpos($b, ':');
		$minLen = min($lenA, $lenB);
		$ncmp = strncmp($a, $b, $minLen);
		if ($lenA == $lenB) return $ncmp;
		if (0 == $ncmp) return $lenA < $lenB ? -1 : 1;
		return $ncmp;
	}

	/**
	* CURL write callback
	*
	* @param resource &$curl CURL resource
	* @param string &$data Data
	* @return integer
	*/
	private function __responseWriteCallback(&$curl, &$data)
	{
		if (in_array($this->response->code, array(200, 206)) && $this->fp !== false)
			return fwrite($this->fp, $data);
		else
			$this->response->body .= $data;
		return strlen($data);
	}


	/**
	* Check DNS conformity
	*
	* @param string $bucket Bucket name
	* @return boolean
	*/
	private function __dnsBucketName($bucket)
	{
		if (strlen($bucket) > 63 || preg_match("/[^a-z0-9\.-]/", $bucket) > 0) return false;
		if (strstr($bucket, '-.') !== false) return false;
		if (strstr($bucket, '..') !== false) return false;
		if (!preg_match("/^[0-9a-z]/", $bucket)) return false;
		if (!preg_match("/[0-9a-z]$/", $bucket)) return false;
		return true;
	}


	/**
	* CURL header callback
	*
	* @param resource &$curl CURL resource
	* @param string &$data Data
	* @return integer
	*/
	private function __responseHeaderCallback(&$curl, &$data)
	{
		if (($strlen = strlen($data)) <= 2) return $strlen;
		if (substr($data, 0, 4) == 'HTTP')
			$this->response->code = (int)substr($data, 9, 3);
		else
		{
			$data = trim($data);
			if (strpos($data, ': ') === false) return $strlen;
			list($header, $value) = explode(': ', $data, 2);
			if ($header == 'Last-Modified')
				$this->response->headers['time'] = strtotime($value);
			elseif ($header == 'Date')
				$this->response->headers['date'] = strtotime($value);
			elseif ($header == 'Content-Length')
				$this->response->headers['size'] = (int)$value;
			elseif ($header == 'Content-Type')
				$this->response->headers['type'] = $value;
			elseif ($header == 'ETag')
				$this->response->headers['hash'] = $value{0} == '"' ? substr($value, 1, -1) : $value;
			elseif (preg_match('/^x-amz-meta-.*$/', $header))
				$this->response->headers[$header] = $value;
		}
		return $strlen;
	}

}

/**
 * SCS exception class
 *
 * @link http://weibo.com/smcz
 * @version 0.1.0-dev
 */

class SCSException extends Exception {
	/**
	 * Class constructor
	 *
	 * @param string $message Exception message
	 * @param string $file File in which exception was created
	 * @param string $line Line number on which exception was created
	 * @param int $code Exception code
	 */
	function __construct($message, $file, $line, $code = 0)
	{
		parent::__construct($message, $code);
		$this->file = $file;
		$this->line = $line;
	}
}