andybroomfield/s3.php

## s3.php
<?php defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * $Id: S3.php 47 2009-07-20 01:25:40Z don.schonknecht $
 *
 * Copyright (c) 2008, Donovan Schönknecht.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * Amazon S3 is a trademark of Amazon.com, Inc. or its affiliates.
 */

/**
 * Amazon S3 PHP class
 *
 * @link http://undesigned.org.za/2007/10/22/amazon-s3-php-class
 * @version 0.4.0
 */
class S3 {

	// 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';

	// storage class flags
	const STORAGE_CLASS_STANDARD = 'STANDARD';
	const STORAGE_CLASS_RRS = 'REDUCED_REDUNDANCY';

	// server-side encryption flags
	const SSE_NONE = '';
	const SSE_AES256 = 'AES256';

	public static $use_ssl = false;
	public static $verify_peer = true;

	private static $__access_key = NULL; // AWS Access key
	private static $__secret_key = NULL; // AWS Secret key

	private static $region = '';

	function __construct($config = array())
	{
		if ( ! empty($config))
		{
			$this->initialize($config);
		}

		log_message('debug', 'S3 Class Initialized');
	}

	// --------------------------------------------------------------------

	/**
	 * Initialize preferences
	 *
	 * @access	public
	 * @param	array
	 * @return	void
	 */
	function initialize($config = array())
	{
		extract($config);

		if ( ! empty($access_key) AND ! empty($secret_key))
		{
			self::setAuth($access_key, $secret_key);
		}

		self::$use_ssl = $use_ssl;
		self::$verify_peer = $verify_peer;
	}

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

	/**
	* Set the service region
	*
	* @param string $region
	* @return void
	*/
	public function setRegion($region)
	{
		self::$region = $region;
	}


	/**
	* Get the service region
	*
	* @return string $region
	* @static
	*/
	public static function getRegion()
	{
		$region = self::$region;

		// parse region from endpoint if not specific
		/*if (empty($region)) {
			if (preg_match("/s3[.-](?:website-|dualstack\.)?(.+)\.amazonaws\.com/i",self::$endpoint,$match) !== 0 && strtolower($match[1]) !== "external-1") {
				$region = $match[1];
			}
		}*/

		return empty($region) ? 'eu-west-2' : $region;
	}


	/**
	 * 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 S3Request('GET', '', '');
		$rest = $rest->getResponse();
		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			trigger_error(sprintf("S3::listBuckets(): [%s] %s", $rest->error['code'], $rest->error['message']), E_USER_WARNING);
			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->ID
				);
			$results['buckets'] = array();
			foreach ($rest->body->Buckets->Bucket as $b)
				$results['buckets'][] = array(
					'name' => (string) $b->Name, 'time' => strtotime((string) $b->CreationDate)
				);
		} else
			foreach ($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
	 * @return array | false
	 */

	public static function getBucket($bucket, $prefix = null, $marker = null, $maxKeys = null, $delimiter = null, $returnCommonPrefixes = false)
	{
		$rest = new S3Request('GET', $bucket, '');
		if ($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)
		{
			trigger_error(sprintf("S3::getBucket(): [%s] %s", $response->error['code'], $response->error['message']), E_USER_WARNING);
			return false;
		}

		$results = array();

		$nextMarker = null;
		if (isset($response->body, $response->body->Contents))
			foreach ($response->body->Contents as $c)
			{
				$results[(string) $c->Key] = array(
					'name' => (string) $c->Key,
					'time' => strtotime((string) $c->LastModified),
					'size' => (int) $c->Size,
					'hash' => substr((string) $c->ETag, 1, -1)
				);
				$nextMarker = (string) $c->Key;
			}

		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->IsTruncated) &&
				(string) $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 && (string) $response->body->IsTruncated == 'true')
			do
			{
				$rest = new S3Request('GET', $bucket, '');
				if ($prefix !== null && $prefix !== '')
					$rest->setParameter('prefix', $prefix);
				$rest->setParameter('marker', $nextMarker);
				if ($delimiter !== null && $delimiter !== '')
					$rest->setParameter('delimiter', $delimiter);

				if (($response = $rest->getResponse(true)) == false || $response->code !== 200)
					break;

				if (isset($response->body, $response->body->Contents))
					foreach ($response->body->Contents as $c)
					{
						$results[(string) $c->Key] = array(
							'name' => (string) $c->Key,
							'time' => strtotime((string) $c->LastModified),
							'size' => (int) $c->Size,
							'hash' => substr((string) $c->ETag, 1, -1)
						);
						$nextMarker = (string) $c->Key;
					}

				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->NextMarker))
					$nextMarker = (string) $response->body->NextMarker;
			} while ($response !== false && (string) $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 S3Request('PUT', $bucket, '');
		$rest->setAmzHeader('x-amz-acl', $acl);

		if ($location !== false)
		{
			$dom = new DOMDocument;
			$createBucketConfiguration = $dom->createElement('CreateBucketConfiguration');
			$locationConstraint = $dom->createElement('LocationConstraint', strtolower($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)
		{
			trigger_error(sprintf("S3::putBucket({$bucket}, {$acl}, {$location}): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			return false;
		}
		return true;
	}

	/**
	 * Delete an empty bucket
	 *
	 * @param string $bucket Bucket name
	 * @return boolean
	 */
	public static function deleteBucket($bucket)
	{
		$rest = new S3Request('DELETE', $bucket);
		$rest = $rest->getResponse();
		if ($rest->error === false && $rest->code !== 204)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			trigger_error(sprintf("S3::deleteBucket({$bucket}): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			return false;
		}
		return true;
	}

	/**
	 * 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))
		{
			trigger_error('S3::inputFile(): Unable to open input file: ' . $file, E_USER_WARNING);
			return false;
		}
		return array('file' => $file, 'size' => filesize($file),
			'md5sum' => $md5sum !== false ? (is_string($md5sum) ? $md5sum : base64_encode(md5_file($file, true))) : '',
			'sha256sum' => hash_file('sha256', $file));
	}

	/**
	 * 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, $md5sum = '')
	{
		if (!is_resource($resource) || $bufferSize < 0)
		{
			trigger_error('S3::inputResource(): Invalid resource or buffer size', E_USER_WARNING);
			return false;
		}
		$input = array('size' => $bufferSize, 'md5sum' => $md5sum);
		$input['fp'] = & $resource;
		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 $serverSideEncryption Server-side encryption
	 * @return boolean
	 */
	public static function putObject($input, $bucket, $uri, $acl = self::ACL_PUBLIC_READ, $metaHeaders = array(), $requestHeaders = array(), $storageClass = self::STORAGE_CLASS_STANDARD, $serverSideEncryption = self::SSE_NONE)
	{
		if ($input === false)
			return false;
		$rest = new S3Request('PUT', $bucket, $uri);

		if (is_string($input))
			$input = array(
				'data' => $input, 'size' => strlen($input),
				'md5sum' => base64_encode(md5($input, true)),
				'sha256sum' => hash('sha256', $input)
			);

		// 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']))
				$rest->size = filesize($input['file']);
			elseif (isset($input['data']))
				$rest->size = strlen($input['data']);
		}

		// 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', $input['md5sum']);
			if (isset($input['sha256sum']))
				$rest->setAmzHeader('x-amz-content-sha256', $input['sha256sum']);

			$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)
		{
			trigger_error(sprintf("S3::putObject(): [%s] %s", $rest->response->error['code'], $rest->response->error['message']), E_USER_WARNING);
			return false;
		}
		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 S3Request('GET', $bucket, $uri);
		if ($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)
		{
			trigger_error(sprintf("S3::getObject({$bucket}, {$uri}): [%s] %s",
							$rest->response->error['code'], $rest->response->error['message']), E_USER_WARNING);
			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 S3Request('HEAD', $bucket, $uri);
		$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)
		{
			trigger_error(sprintf("S3::getObjectInfo({$bucket}, {$uri}): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			return false;
		}
		return $rest->code == 200 ? $returnInfo ? $rest->headers : true : false;
	}

	/**
	 * Copy an object
	 *
	 * @param string $bucket Source bucket name
	 * @param string $uri 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 S3Request('PUT', $bucket, $uri);
		$rest->setHeader('Content-Length', 0);
		foreach ($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, $srcUri));
		if (sizeof($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)
		{
			trigger_error(sprintf("S3::copyObject({$srcBucket}, {$srcUri}, {$bucket}, {$uri}): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			return false;
		}
		return isset($rest->body->LastModified, $rest->body->ETag) ? array(
			'time' => strtotime((string) $rest->body->LastModified),
			'hash' => substr((string) $rest->body->ETag, 1, -1)
				) : false;
	}

	/**
	 * 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, $targetPrefix = null)
	{
		// The S3 log delivery group has to be added to the target bucket's ACP
		if ($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 S3Request('PUT', $bucket, '');
		$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)
		{
			trigger_error(sprintf("S3::setBucketLogging({$bucket}, {$uri}): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			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 S3Request('GET', $bucket, '');
		$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)
		{
			trigger_error(sprintf("S3::getBucketLogging({$bucket}): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			return false;
		}
		if (!isset($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 S3Request('GET', $bucket, '');
		$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)
		{
			trigger_error(sprintf("S3::getBucketLocation({$bucket}): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			return false;
		}
		return (isset($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 S3Request('PUT', $bucket, $uri);
		$rest->setParameter('acl', 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)
		{
			trigger_error(sprintf("S3::setAccessControlPolicy({$bucket}, {$uri}): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			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 S3Request('GET', $bucket, $uri);
		$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)
		{
			trigger_error(sprintf("S3::getAccessControlPolicy({$bucket}, {$uri}): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			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;
				}
			}
		}
		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 S3Request('DELETE', $bucket, $uri);
		$rest = $rest->getResponse();
		if ($rest->error === false && $rest->code !== 204)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			trigger_error(sprintf("S3::deleteObject(): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			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)
	 * @return string
	 */
	public static function getAuthenticatedURL($bucket, $uri, $lifetime, $hostBucket = false, $https = false)
	{
		$expires = time() + $lifetime;
		$uri = str_replace('%2F', '/', rawurlencode($uri)); // URI should be encoded (thanks Sean O'Dea)
		return sprintf(($https ? 'https' : 'http') . '://%s/%s?AWSAccessKeyId=%s&Expires=%u&Signature=%s',
				$hostBucket ? $bucket : $bucket . '.s3.amazonaws.com', $uri, self::$__access_key, $expires,
				urlencode(self::__getHash("GET\n\n\n{$expires}\n/{$bucket}/{$uri}")));
	}

	/**
	 * 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\Z', (time() + $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);

		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;
		$params->AWSAccessKeyId = self::$__access_key;
		$params->key = $uriPrefix . '${filename}';
		$params->acl = $acl;
		$params->policy = $policy;
		unset($policy);
		$params->signature = self::__getHash($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;
		return $params;
	}

	/**
	 * Create a CloudFront distribution
	 *
	 * @param string $bucket Bucket name
	 * @param boolean $enabled Enabled (true/false)
	 * @param array $cnames Array containing CNAME aliases
	 * @param string $comment Use the bucket name as the hostname
	 * @return array | false
	 */
	public static function createDistribution($bucket, $enabled = true, $cnames = array(), $comment = '')
	{
		self::$use_ssl = true; // CloudFront requires SSL
		$rest = new S3Request('POST', '', '2008-06-30/distribution', 'cloudfront.amazonaws.com');
		$rest->data = self::__getCloudFrontDistributionConfigXML($bucket . '.s3.amazonaws.com', $enabled, $comment, (string) microtime(true), $cnames);
		$rest->size = strlen($rest->data);
		$rest->setHeader('Content-Type', 'application/xml');
		$rest = self::__getCloudFrontResponse($rest);

		if ($rest->error === false && $rest->code !== 201)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			trigger_error(sprintf("S3::createDistribution({$bucket}, " . (int) $enabled . ", '$comment'): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			return false;
		}
		elseif ($rest->body instanceof SimpleXMLElement)
			return self::__parseCloudFrontDistributionConfig($rest->body);
		return false;
	}

	/**
	 * Get CloudFront distribution info
	 *
	 * @param string $distributionId Distribution ID from listDistributions()
	 * @return array | false
	 */
	public static function getDistribution($distributionId)
	{
		self::$use_ssl = true; // CloudFront requires SSL
		$rest = new S3Request('GET', '', '2008-06-30/distribution/' . $distributionId, 'cloudfront.amazonaws.com');
		$rest = self::__getCloudFrontResponse($rest);

		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			trigger_error(sprintf("S3::getDistribution($distributionId): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			return false;
		}
		elseif ($rest->body instanceof SimpleXMLElement)
		{
			$dist = self::__parseCloudFrontDistributionConfig($rest->body);
			$dist['hash'] = $rest->headers['hash'];
			return $dist;
		}
		return false;
	}

	/**
	 * Update a CloudFront distribution
	 *
	 * @param array $dist Distribution array info identical to output of getDistribution()
	 * @return array | false
	 */
	public static function updateDistribution($dist)
	{
		self::$use_ssl = true; // CloudFront requires SSL
		$rest = new S3Request('PUT', '', '2008-06-30/distribution/' . $dist['id'] . '/config', 'cloudfront.amazonaws.com');
		$rest->data = self::__getCloudFrontDistributionConfigXML($dist['origin'], $dist['enabled'], $dist['comment'], $dist['callerReference'], $dist['cnames']);
		$rest->size = strlen($rest->data);
		$rest->setHeader('If-Match', $dist['hash']);
		$rest = self::__getCloudFrontResponse($rest);

		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			trigger_error(sprintf("S3::updateDistribution({$dist['id']}, " . (int) $enabled . ", '$comment'): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			return false;
		}
		else
		{
			$dist = self::__parseCloudFrontDistributionConfig($rest->body);
			$dist['hash'] = $rest->headers['hash'];
			return $dist;
		}
		return false;
	}

	/**
	 * Delete a CloudFront distribution
	 *
	 * @param array $dist Distribution array info identical to output of getDistribution()
	 * @return boolean
	 */
	public static function deleteDistribution($dist)
	{
		self::$use_ssl = true; // CloudFront requires SSL
		$rest = new S3Request('DELETE', '', '2008-06-30/distribution/' . $dist['id'], 'cloudfront.amazonaws.com');
		$rest->setHeader('If-Match', $dist['hash']);
		$rest = self::__getCloudFrontResponse($rest);

		if ($rest->error === false && $rest->code !== 204)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			trigger_error(sprintf("S3::deleteDistribution({$dist['id']}): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			return false;
		}
		return true;
	}

	/**
	 * Get a list of CloudFront distributions
	 *
	 * @return array
	 */
	public static function listDistributions()
	{
		self::$use_ssl = true; // CloudFront requires SSL
		$rest = new S3Request('GET', '', '2008-06-30/distribution', 'cloudfront.amazonaws.com');
		$rest = self::__getCloudFrontResponse($rest);

		if ($rest->error === false && $rest->code !== 200)
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if ($rest->error !== false)
		{
			trigger_error(sprintf("S3::listDistributions(): [%s] %s",
							$rest->error['code'], $rest->error['message']), E_USER_WARNING);
			return false;
		}
		elseif ($rest->body instanceof SimpleXMLElement && isset($rest->body->DistributionSummary))
		{
			$list = array();
			if (isset($rest->body->Marker, $rest->body->MaxItems, $rest->body->IsTruncated))
			{
				//$info['marker'] = (string)$rest->body->Marker;
				//$info['maxItems'] = (int)$rest->body->MaxItems;
				//$info['isTruncated'] = (string)$rest->body->IsTruncated == 'true' ? true : false;
			}
			foreach ($rest->body->DistributionSummary as $summary)
			{
				$list[(string) $summary->Id] = self::__parseCloudFrontDistributionConfig($summary);
			}
			return $list;
		}
		return array();
	}

	/**
	 * Get a DistributionConfig DOMDocument
	 *
	 * @internal Used to create XML in createDistribution() and updateDistribution()
	 * @param string $bucket Origin bucket
	 * @param boolean $enabled Enabled (true/false)
	 * @param string $comment Comment to append
	 * @param string $callerReference Caller reference
	 * @param array $cnames Array of CNAME aliases
	 * @return string
	 */
	private static function __getCloudFrontDistributionConfigXML($bucket, $enabled, $comment, $callerReference = '0', $cnames = array())
	{
		$dom = new DOMDocument('1.0', 'UTF-8');
		$dom->formatOutput = true;
		$distributionConfig = $dom->createElement('DistributionConfig');
		$distributionConfig->setAttribute('xmlns', 'http://cloudfront.amazonaws.com/doc/2008-06-30/');
		$distributionConfig->appendChild($dom->createElement('Origin', $bucket));
		$distributionConfig->appendChild($dom->createElement('CallerReference', $callerReference));
		foreach ($cnames as $cname)
			$distributionConfig->appendChild($dom->createElement('CNAME', $cname));
		if ($comment !== '')
			$distributionConfig->appendChild($dom->createElement('Comment', $comment));
		$distributionConfig->appendChild($dom->createElement('Enabled', $enabled ? 'true' : 'false'));
		$dom->appendChild($distributionConfig);
		return $dom->saveXML();
	}

	/**
	 * Parse a CloudFront distribution config
	 *
	 * @internal Used to parse the CloudFront DistributionConfig node to an array
	 * @param object &$node DOMNode
	 * @return array
	 */
	private static function __parseCloudFrontDistributionConfig(&$node)
	{
		$dist = array();
		if (isset($node->Id, $node->Status, $node->LastModifiedTime, $node->DomainName))
		{
			$dist['id'] = (string) $node->Id;
			$dist['status'] = (string) $node->Status;
			$dist['time'] = strtotime((string) $node->LastModifiedTime);
			$dist['domain'] = (string) $node->DomainName;
		}
		if (isset($node->CallerReference))
			$dist['callerReference'] = (string) $node->CallerReference;
		if (isset($node->Comment))
			$dist['comment'] = (string) $node->Comment;
		if (isset($node->Enabled, $node->Origin))
		{
			$dist['origin'] = (string) $node->Origin;
			$dist['enabled'] = (string) $node->Enabled == 'true' ? true : false;
		}
		elseif (isset($node->DistributionConfig))
		{
			$dist = array_merge($dist, self::__parseCloudFrontDistributionConfig($node->DistributionConfig));
		}
		if (isset($node->CNAME))
		{
			$dist['cnames'] = array();
			foreach ($node->CNAME as $cname)
				$dist['cnames'][(string) $cname] = (string) $cname;
		}
		return $dist;
	}

	/**
	 * Grab CloudFront response
	 *
	 * @internal Used to parse the CloudFront S3Request::getResponse() output
	 * @param object &$rest S3Request instance
	 * @return object
	 */
	private static function __getCloudFrontResponse(&$rest)
	{
		$rest->getResponse();
		if ($rest->response->error === false && isset($rest->response->body) &&
				is_string($rest->response->body) && substr($rest->response->body, 0, 5) == '<?xml')
		{
			$rest->response->body = simplexml_load_string($rest->response->body);
			// Grab CloudFront errors
			if (isset($rest->response->body->Error, $rest->response->body->Error->Code,
							$rest->response->body->Error->Message))
			{
				$rest->response->error = array(
					'code' => (string) $rest->response->body->Error->Code,
					'message' => (string) $rest->response->body->Error->Message
				);
				unset($rest->response->body);
			}
		}
		return $rest->response;
	}

	/**
	 * Get MIME type for file
	 *
	 * @internal Used to get mime types
	 * @param string &$file File path
	 * @return string
	 */
	public static function __getMimeType(&$file)
	{
		$type = false;
		// Fileinfo documentation says fileinfo_open() will use the
		// MAGIC env var for the magic file
		if (extension_loaded('fileinfo') && isset($_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 anyone is still using mime_content_type()
		}
		elseif (function_exists('mime_content_type'))
			$type = trim(mime_content_type($file));

		if ($type !== false && strlen($type) > 0)
			return $type;

		// Otherwise do it the old fashioned way
		static $exts = array(
	'jpg' => 'image/jpeg', 'gif' => 'image/gif', 'png' => 'image/png',
	'tif' => 'image/tiff', 'tiff' => 'image/tiff', 'ico' => 'image/x-icon',
	'swf' => 'application/x-shockwave-flash', 'pdf' => 'application/pdf',
	'zip' => 'application/zip', 'gz' => 'application/x-gzip',
	'tar' => 'application/x-tar', 'bz' => 'application/x-bzip',
	'bz2' => 'application/x-bzip2', '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));
		return isset($exts[$ext]) ? $exts[$ext] : 'application/octet-stream';
	}

	/**
	 * Generate the auth string: "AWS AccessKey:Signature"
	 *
	 * @internal Used by S3Request::getResponse()
	 * @param string $string String to sign
	 * @return string
	 */
	public static function __getSignature($string)
	{
		return 'AWS ' . self::$__access_key . ':' . self::__getHash($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 base64_encode(extension_loaded('hash') ?
						hash_hmac('sha1', $string, self::$__secret_key, true) : pack('H*', sha1(
										(str_pad(self::$__secret_key, 64, chr(0x00)) ^ (str_repeat(chr(0x5c), 64))) .
										pack('H*', sha1((str_pad(self::$__secret_key, 64, chr(0x00)) ^
														(str_repeat(chr(0x36), 64))) . $string)))));
	}

	/**
	* Generate the headers for AWS Signature V4
	* @internal Used by S3Request::getResponse()
	* @param array $aheaders amzHeaders
	* @param array $headers
	* @param string $method
	* @param string $uri
	* @param string $data
	* @return array $headers
	*/
	public static function __getSignatureV4($aHeaders, $headers, $method='GET', $uri='', $data = '')
	{
		$service = 's3';
		$region = S3::getRegion();

		$algorithm = 'AWS4-HMAC-SHA256';
		$amzHeaders = array();
		$amzRequests = array();

		$amzDate =  gmdate( 'Ymd\THis\Z' );
		$amzDateStamp = gmdate( 'Ymd' );

		// amz-date ISO8601 format ? for aws request
		$amzHeaders['x-amz-date'] = $amzDate;

		// CanonicalHeaders
		foreach ( $headers as $k => $v ) {
			$amzHeaders[ strtolower( $k ) ] = trim( $v );
		}
		foreach ( $aHeaders as $k => $v ) {
			$amzHeaders[ strtolower( $k ) ] = trim( $v );
		}
		uksort( $amzHeaders, 'strcmp' );

		// payload
		$payloadHash = isset($amzHeaders['x-amz-content-sha256']) ? $amzHeaders['x-amz-content-sha256'] :  hash('sha256', $data);

		// parameters
		$parameters = array();
		if (strpos($uri, '?')) {
			list ($uri, $query_str) = @explode("?", $uri);
			parse_str($query_str, $parameters);
		}

		// CanonicalRequests
		$amzRequests[] = $method;
		$uriQmPos = strpos($uri, '?');
		$amzRequests[] = ($uriQmPos === false ? $uri : substr($uri, 0, $uriQmPos));
		$amzRequests[] = http_build_query($parameters);
		// add header as string to requests
		foreach ( $amzHeaders as $k => $v ) {
			$amzRequests[] = $k . ':' . $v;
		}
		// add a blank entry so we end up with an extra line break
		$amzRequests[] = '';
		// SignedHeaders
		$amzRequests[] = implode( ';', array_keys( $amzHeaders ) );
		// payload hash
		$amzRequests[] = $payloadHash;
		// request as string
		$amzRequestStr = implode("\n", $amzRequests);

		// CredentialScope
		$credentialScope = array();
		$credentialScope[] = $amzDateStamp;
		$credentialScope[] = $region;
		$credentialScope[] = $service;
		$credentialScope[] = 'aws4_request';

		// stringToSign
		$stringToSign = array();
		$stringToSign[] = $algorithm;
		$stringToSign[] = $amzDate;
		$stringToSign[] = implode('/', $credentialScope);
		$stringToSign[] =  hash('sha256', $amzRequestStr);
		// as string
		$stringToSignStr = implode("\n", $stringToSign);

		// Make Signature
		$kSecret = 'AWS4' . self::$__secret_key;
		$kDate = hash_hmac( 'sha256', $amzDateStamp, $kSecret, true );
		$kRegion = hash_hmac( 'sha256', $region, $kDate, true );
		$kService = hash_hmac( 'sha256', $service, $kRegion, true );
		$kSigning = hash_hmac( 'sha256', 'aws4_request', $kService, true );

		$signature = hash_hmac( 'sha256', $stringToSignStr, $kSigning );

		$authorization = array(
			'Credential=' . self::$__access_key . '/' . implode( '/', $credentialScope ),
			'SignedHeaders=' . implode( ';', array_keys( $amzHeaders ) ),
			'Signature=' . $signature,
		);

		$authorizationStr = $algorithm . ' ' . implode( ',', $authorization );

		$resultHeaders = array(
			'X-AMZ-DATE' => $amzDate,
			'Authorization' => $authorizationStr
		);
		if (!isset($aHeaders['x-amz-content-sha256'])) $resultHeaders['x-amz-content-sha256'] = $payloadHash;

		return $resultHeaders;
	}
}

final class S3Request {

	private $verb, $bucket, $uri, $resource = '', $parameters = array(),
	$amzHeaders = array(), $headers = array(
		'Host' => '', 'Date' => '', 'Content-MD5' => '', 'Content-Type' => ''
	);
	public $fp = false, $size = 0, $data = false, $response;

	/**
	 * Constructor
	 *
	 * @param string $verb Verb
	 * @param string $bucket Bucket name
	 * @param string $uri Object URI
	 * @return mixed
	 */
	function __construct($verb, $bucket = '', $uri = '', $defaultHost = 's3.amazonaws.com')
	{
		$this->verb = $verb;
		$this->bucket = strtolower($bucket);
		$this->uri = $uri !== '' ? '/' . str_replace('%2F', '/', rawurlencode($uri)) : '/';

		if ($this->bucket !== '')
		{
			$this->headers['Host'] = $this->bucket . '.' . $defaultHost;
			$this->resource = '/' . $this->bucket . $this->uri;
		}
		else
		{
			$this->headers['Host'] = $defaultHost;
			//$this->resource = strlen($this->uri) > 1 ? '/'.$this->bucket.$this->uri : $this->uri;
			$this->resource = $this->uri;
		}
		$this->headers['Date'] = gmdate('D, d M Y H:i:s T');

		$this->response = new STDClass;
		$this->response->error = false;
	}

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

	/**
	 * 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 S3 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 . '&';
				// Parameters should be encoded (thanks Sean O'Dea)
				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('logging', $this->parameters))
				$this->resource .= $query;
		}
		$url = ((S3::$use_ssl && extension_loaded('openssl')) ?
						'https://' : 'http://') . $this->headers['Host'] . $this->uri;
		//var_dump($this->bucket, $this->uri, $this->resource, $url);
		// Basic setup
		$curl = curl_init();
		curl_setopt($curl, CURLOPT_USERAGENT, 'S3/php');

		if (S3::$use_ssl)
		{
			curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
			if (S3::$verify_peer)
			{
			    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 1);
			}
			else
			{
			    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
			}
		}

		curl_setopt($curl, CURLOPT_URL, $url);

		// 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);
			$amz = "\n" . implode("\n", $amz);
		} else
			$amz = '';

		// Authorization string (CloudFront stringToSign should only contain a date)
		/*$headers[] = 'Authorization: ' . S3::__getSignature(
						$this->headers['Host'] == 'cloudfront.amazonaws.com' ? $this->headers['Date'] :
								$this->verb . "\n" . $this->headers['Content-MD5'] . "\n" .
								$this->headers['Content-Type'] . "\n" . $this->headers['Date'] . $amz . "\n" . $this->resource
		);*/
		$amzHeaders = S3::__getSignatureV4(
						$this->amzHeaders,
						$this->headers,
						$this->verb,
						$this->uri,
						$this->data
					);
					foreach ($amzHeaders as $k => $v) {
						$headers[] = $k .': '. $v;
					}

		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);

		// 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, $this->data);
					if ($this->size >= 0)
						curl_setopt($curl, CURLOPT_BUFFERSIZE, $this->size);
				} else
					curl_setopt($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
			);

		@curl_close($curl);

		// Parse body
		if ($this->response->error === false && isset($this->response->headers['type']) && isset($this->response->body))
		{
			if($this->response->headers['type'] == 'application/json')
			{
				$this->response->body = json_decode($this->response->body);
			}elseif($this->response->headers['type']== 'application/xml')
			{
				$this->response->body = simplexml_load_string($this->response->body);
			}
			// Grab S3 errors
			if (!in_array($this->response->code, array(200, 204)) &&
					isset($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;
	}

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

	/**
	 * 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
		{
			list($header, $value) = explode(': ', trim($data), 2);
			if ($header == 'Last-Modified')
				$this->response->headers['time'] = strtotime($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] = is_numeric($value) ? (int) $value : $value;
		}
		return $strlen;
	}

}