Merge branch 'wip-mdl-48190-m27' of https://github.com/rajeshtaneja/moodle into MOODL...

[moodle.git] / repository / s3 / S3.php

<?php
/**
* $Id$
*
* Copyright (c) 2011, 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 0.5.0-dev
*/
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';

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

        private static $__accessKey = null; // AWS Access key
        private static $__secretKey = null; // AWS Secret key
        private static $__sslKey = null;

        public static $endpoint = 's3.amazonaws.com';
        public static $proxy = null;

        public static $useSSL = false;
        public static $useSSLValidation = true;
        public static $useExceptions = false;

        // SSL CURL SSL options - only needed if you are experiencing problems with your OpenSSL configuration
        public static $sslKey = null;
        public static $sslCert = null;
        public static $sslCACert = null;

        private static $__signingKeyPairId = null; // AWS Key Pair ID
        private static $__signingKeyResource = false; // Key resource, freeSigningKey() must be called to clear it from memory


        /**
        * Constructor - if you're not using the class statically
        *
        * @param string $accessKey Access key
        * @param string $secretKey Secret key
        * @param boolean $useSSL Enable SSL
        * @return void
        */
        public function __construct($accessKey = null, $secretKey = null, $useSSL = false, $endpoint = 's3.amazonaws.com')
        {
                if ($accessKey !== null && $secretKey !== null)
                        self::setAuth($accessKey, $secretKey);
                self::$useSSL = $useSSL;
                self::$endpoint = $endpoint;
        }


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

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


        /**
        * Check if AWS 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' => null, 'pass' => 'null');
        }


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


        /**
        * Set signing key
        *
        * @param string $keyPairId AWS 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) : $signingKey)) !== false) return true;
                self::__triggerError('S3::setSigningKey(): Unable to open load private key: '.$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 S3Exception($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)
        {
                $rest = new S3Request('GET', '', '', self::$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("S3::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->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', $bucket, '', self::$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("S3::getBucket(): [%s] %s",
                        $response->error['code'], $response->error['message']), __FILE__, __LINE__);
                        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', $bucket, '', self::$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 (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', $bucket, '', self::$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("S3::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 S3Request('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("S3::deleteBucket({$bucket}): [%s] %s",
                        $rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
                        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))
                {
                        self::__triggerError('S3::inputFile(): Unable to open input file: '.$file, __FILE__, __LINE__);
                        return false;
                }
                return array('file' => $file, 'size' => filesize($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, $md5sum = '')
        {
                if (!is_resource($resource) || $bufferSize < 0)
                {
                        self::__triggerError('S3::inputResource(): Invalid resource or buffer size', __FILE__, __LINE__);
                        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 $storageClass Storage class constant
        * @return boolean
        */
        public static function putObject($input, $bucket, $uri, $acl = self::ACL_PRIVATE, $metaHeaders = array(), $requestHeaders = array(), $storageClass = self::STORAGE_CLASS_STANDARD)
        {
                if ($input === false) return false;
                $rest = new S3Request('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']))
                                $rest->size = filesize($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);

                // 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("S3::putObject(): [%s] %s",
                        $rest->response->error['code'], $rest->response->error['message']), __FILE__, __LINE__);
                        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, $uri, self::$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("S3::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 S3Request('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("S3::getObjectInfo({$bucket}, {$uri}): [%s] %s",
                        $rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
                        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, $uri, self::$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)));
                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("S3::copyObject({$srcBucket}, {$srcUri}, {$bucket}, {$uri}): [%s] %s",
                        $rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
                        return false;
                }
                return isset($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', $bucket, '', self::$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("S3::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 S3Request('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("S3::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 S3Request('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("S3::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 S3Request('PUT', $bucket, $uri, self::$endpoint);
                $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)
                {
                        self::__triggerError(sprintf("S3::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 S3Request('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("S3::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;
                                }
                        }
                }
                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, $uri, self::$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("S3::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)
        * @return string
        */
        public static function getAuthenticatedURL($bucket, $uri, $lifetime, $hostBucket = false, $https = false)
        {
                $expires = time() + $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 ? $bucket : 's3.amazonaws.com/'.$bucket, $uri, self::$__accessKey, $expires,
                urlencode(self::__getHash("GET\n\n\n{$expires}\n/{$bucket}/{$uri}")));
        }


        /**
        * Get a CloudFront signed policy URL
        *
        * @param array $policy Policy
        * @return string
        */
        public static function getSignedPolicyURL($policy)
        {
                $data = json_encode($policy);
                $signature = '';
                if (!openssl_sign($data, $signature, self::$__signingKeyResource)) return false;

                $encoded = str_replace(array('+', '='), array('-', '_', '~'), base64_encode($data));
                $signature = str_replace(array('+', '='), array('-', '_', '~'), base64_encode($signature));

                $url = $policy['Statement'][0]['Resource'] . '?';
                foreach (array('Policy' => $encoded, 'Signature' => $signature, 'Key-Pair-Id' => self::$__signingKeyPairId) as $k => $v)
                        $url .= $k.'='.str_replace('%2F', '/', rawurlencode($v)).'&';
                return substr($url, 0, -1);
        }


        /**
        * Get a CloudFront canned policy URL
        *
        * @param string $string URL to sign
        * @param integer $lifetime URL lifetime
        * @return string
        */
        public static function getSignedCannedURL($url, $lifetime)
        {
                return self::getSignedPolicyURL(array(
                        'Statement' => array(
                                array('Resource' => $url, 'Condition' => array(
                                        'DateLessThan' => array('AWS:EpochTime' => time() + $lifetime)
                                ))
                        )
                ));
        }


        /**
        * 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);

                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;
                $params->AWSAccessKeyId = self::$__accessKey;
                $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
        * @param string $defaultRootObject Default root object
        * @param string $originAccessIdentity Origin access identity
        * @param array $trustedSigners Array of trusted signers
        * @return array | false
        */
        public static function createDistribution($bucket, $enabled = true, $cnames = array(), $comment = null, $defaultRootObject = null, $originAccessIdentity = null, $trustedSigners = array())
        {
                if (!extension_loaded('openssl'))
                {
                        self::__triggerError(sprintf("S3::createDistribution({$bucket}, ".(int)$enabled.", [], '$comment'): %s",
                        "CloudFront functionality requires SSL"), __FILE__, __LINE__);
                        return false;
                }
                $useSSL = self::$useSSL;

                self::$useSSL = true; // CloudFront requires SSL
                $rest = new S3Request('POST', '', '2010-11-01/distribution', 'cloudfront.amazonaws.com');
                $rest->data = self::__getCloudFrontDistributionConfigXML(
                        $bucket.'.s3.amazonaws.com',
                        $enabled,
                        (string)$comment,
                        (string)microtime(true),
                        $cnames,
                        $defaultRootObject,
                        $originAccessIdentity,
                        $trustedSigners
                );

                $rest->size = strlen($rest->data);
                $rest->setHeader('Content-Type', 'application/xml');
                $rest = self::__getCloudFrontResponse($rest);

                self::$useSSL = $useSSL;

                if ($rest->error === false && $rest->code !== 201)
                        $rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
                if ($rest->error !== false)
                {
                        self::__triggerError(sprintf("S3::createDistribution({$bucket}, ".(int)$enabled.", [], '$comment'): [%s] %s",
                        $rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
                        return false;
                } elseif ($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)
        {
                if (!extension_loaded('openssl'))
                {
                        self::__triggerError(sprintf("S3::getDistribution($distributionId): %s",
                        "CloudFront functionality requires SSL"), __FILE__, __LINE__);
                        return false;
                }
                $useSSL = self::$useSSL;

                self::$useSSL = true; // CloudFront requires SSL
                $rest = new S3Request('GET', '', '2010-11-01/distribution/'.$distributionId, 'cloudfront.amazonaws.com');
                $rest = self::__getCloudFrontResponse($rest);

                self::$useSSL = $useSSL;

                if ($rest->error === false && $rest->code !== 200)
                        $rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
                if ($rest->error !== false)
                {
                        self::__triggerError(sprintf("S3::getDistribution($distributionId): [%s] %s",
                        $rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
                        return false;
                }
                elseif ($rest->body instanceof SimpleXMLElement)
                {
                        $dist = self::__parseCloudFrontDistributionConfig($rest->body);
                        $dist['hash'] = $rest->headers['hash'];
                        $dist['id'] = $distributionId;
                        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)
        {
                if (!extension_loaded('openssl'))
                {
                        self::__triggerError(sprintf("S3::updateDistribution({$dist['id']}): %s",
                        "CloudFront functionality requires SSL"), __FILE__, __LINE__);
                        return false;
                }

                $useSSL = self::$useSSL;

                self::$useSSL = true; // CloudFront requires SSL
                $rest = new S3Request('PUT', '', '2010-11-01/distribution/'.$dist['id'].'/config', 'cloudfront.amazonaws.com');
                $rest->data = self::__getCloudFrontDistributionConfigXML(
                        $dist['origin'],
                        $dist['enabled'],
                        $dist['comment'],
                        $dist['callerReference'],
                        $dist['cnames'],
                        $dist['defaultRootObject'],
                        $dist['originAccessIdentity'],
                        $dist['trustedSigners']
                );

                $rest->size = strlen($rest->data);
                $rest->setHeader('If-Match', $dist['hash']);
                $rest = self::__getCloudFrontResponse($rest);

                self::$useSSL = $useSSL;

                if ($rest->error === false && $rest->code !== 200)
                        $rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
                if ($rest->error !== false)
                {
                        self::__triggerError(sprintf("S3::updateDistribution({$dist['id']}): [%s] %s",
                        $rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
                        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)
        {
                if (!extension_loaded('openssl'))
                {
                        self::__triggerError(sprintf("S3::deleteDistribution({$dist['id']}): %s",
                        "CloudFront functionality requires SSL"), __FILE__, __LINE__);
                        return false;
                }

                $useSSL = self::$useSSL;

                self::$useSSL = 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);

                self::$useSSL = $useSSL;

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


        /**
        * Get a list of CloudFront distributions
        *
        * @return array
        */
        public static function listDistributions()
        {
                if (!extension_loaded('openssl'))
                {
                        self::__triggerError(sprintf("S3::listDistributions(): [%s] %s",
                        "CloudFront functionality requires SSL"), __FILE__, __LINE__);
                        return false;
                }

                $useSSL = self::$useSSL;
                self::$useSSL = true; // CloudFront requires SSL
                $rest = new S3Request('GET', '', '2010-11-01/distribution', 'cloudfront.amazonaws.com');
                $rest = self::__getCloudFrontResponse($rest);
                self::$useSSL = $useSSL;

                if ($rest->error === false && $rest->code !== 200)
                        $rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
                if ($rest->error !== false)
                {
                        self::__triggerError(sprintf("S3::listDistributions(): [%s] %s",
                        $rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
                        return false;
                }
                elseif ($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();
        }

        /**
        * List CloudFront Origin Access Identities
        *
        * @return array
        */
        public static function listOriginAccessIdentities()
        {
                if (!extension_loaded('openssl'))
                {
                        self::__triggerError(sprintf("S3::listOriginAccessIdentities(): [%s] %s",
                        "CloudFront functionality requires SSL"), __FILE__, __LINE__);
                        return false;
                }

                self::$useSSL = true; // CloudFront requires SSL
                $rest = new S3Request('GET', '', '2010-11-01/origin-access-identity/cloudfront', 'cloudfront.amazonaws.com');
                $rest = self::__getCloudFrontResponse($rest);
                $useSSL = self::$useSSL;

                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::listOriginAccessIdentities(): [%s] %s",
                        $rest->error['code'], $rest->error['message']), E_USER_WARNING);
                        return false;
                }

                if (isset($rest->body->CloudFrontOriginAccessIdentitySummary))
                {
                        $identities = array();
                        foreach ($rest->body->CloudFrontOriginAccessIdentitySummary as $identity)
                                if (isset($identity->S3CanonicalUserId))
                                        $identities[(string)$identity->Id] = array('id' => (string)$identity->Id, 's3CanonicalUserId' => (string)$identity->S3CanonicalUserId);
                        return $identities;
                }
                return false;
        }


        /**
        * Invalidate objects in a CloudFront distribution
        *
        * Thanks to Martin Lindkvist for S3::invalidateDistribution()
        *
        * @param string $distributionId Distribution ID from listDistributions()
        * @param array $paths Array of object paths to invalidate
        * @return boolean
        */
        public static function invalidateDistribution($distributionId, $paths)
        {
                if (!extension_loaded('openssl'))
                {
                        self::__triggerError(sprintf("S3::invalidateDistribution(): [%s] %s",
                        "CloudFront functionality requires SSL"), __FILE__, __LINE__);
                        return false;
                }

                $useSSL = self::$useSSL;
                self::$useSSL = true; // CloudFront requires SSL
                $rest = new S3Request('POST', '', '2010-08-01/distribution/'.$distributionId.'/invalidation', 'cloudfront.amazonaws.com');
                $rest->data = self::__getCloudFrontInvalidationBatchXML($paths, (string)microtime(true));
                $rest->size = strlen($rest->data);
                $rest = self::__getCloudFrontResponse($rest);
                self::$useSSL = $useSSL;

                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::invalidate('{$distributionId}',{$paths}): [%s] %s",
                        $rest->error['code'], $rest->error['message']), E_USER_WARNING);
                        return false;
                }
                return true;
        }


        /**
        * Get a InvalidationBatch DOMDocument
        *
        * @internal Used to create XML in invalidateDistribution()
        * @param array $paths Paths to objects to invalidateDistribution
        * @return string
        */
        private static function __getCloudFrontInvalidationBatchXML($paths, $callerReference = '0') {
                $dom = new DOMDocument('1.0', 'UTF-8');
                $dom->formatOutput = true;
                $invalidationBatch = $dom->createElement('InvalidationBatch');
                foreach ($paths as $path)
                        $invalidationBatch->appendChild($dom->createElement('Path', $path));

                $invalidationBatch->appendChild($dom->createElement('CallerReference', $callerReference));
                $dom->appendChild($invalidationBatch);
                return $dom->saveXML();
        }


        /**
        * List your invalidation batches for invalidateDistribution() in a CloudFront distribution
        *
        * http://docs.amazonwebservices.com/AmazonCloudFront/latest/APIReference/ListInvalidation.html
        * returned array looks like this:
        *       Array
        *       (
        *               [I31TWB0CN9V6XD] => InProgress
        *               [IT3TFE31M0IHZ] => Completed
        *               [I12HK7MPO1UQDA] => Completed
        *               [I1IA7R6JKTC3L2] => Completed
        *       )
    *
        * @param string $distributionId Distribution ID from listDistributions()
        * @return array
        */
        public static function getDistributionInvalidationList($distributionId)
        {
                if (!extension_loaded('openssl'))
                {
                        self::__triggerError(sprintf("S3::getDistributionInvalidationList(): [%s] %s",
                        "CloudFront functionality requires SSL"), __FILE__, __LINE__);
                        return false;
                }

                $useSSL = self::$useSSL;
                self::$useSSL = true; // CloudFront requires SSL
                $rest = new S3Request('GET', '', '2010-11-01/distribution/'.$distributionId.'/invalidation', 'cloudfront.amazonaws.com');
                $rest = self::__getCloudFrontResponse($rest);
                self::$useSSL = $useSSL;

                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::getDistributionInvalidationList('{$distributionId}'): [%s]",
                        $rest->error['code'], $rest->error['message']), E_USER_WARNING);
                        return false;
                }
                elseif ($rest->body instanceof SimpleXMLElement && isset($rest->body->InvalidationSummary))
                {
                        $list = array();
                        foreach ($rest->body->InvalidationSummary as $summary)
                                $list[(string)$summary->Id] = (string)$summary->Status;

                        return $list;
                }
                return array();
        }


        /**
        * Get a DistributionConfig DOMDocument
        *
        * http://docs.amazonwebservices.com/AmazonCloudFront/latest/APIReference/index.html?PutConfig.html
        *
        * @internal Used to create XML in createDistribution() and updateDistribution()
        * @param string $bucket S3 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
        * @param string $defaultRootObject Default root object
        * @param string $originAccessIdentity Origin access identity
        * @param array $trustedSigners Array of trusted signers
        * @return string
        */
        private static function __getCloudFrontDistributionConfigXML($bucket, $enabled, $comment, $callerReference = '0', $cnames = array(), $defaultRootObject = null, $originAccessIdentity = null, $trustedSigners = array())
        {
                $dom = new DOMDocument('1.0', 'UTF-8');
                $dom->formatOutput = true;
                $distributionConfig = $dom->createElement('DistributionConfig');
                $distributionConfig->setAttribute('xmlns', 'http://cloudfront.amazonaws.com/doc/2010-11-01/');

                $origin = $dom->createElement('S3Origin');
                $origin->appendChild($dom->createElement('DNSName', $bucket));
                if ($originAccessIdentity !== null) $origin->appendChild($dom->createElement('OriginAccessIdentity', $originAccessIdentity));
                $distributionConfig->appendChild($origin);

                if ($defaultRootObject !== null) $distributionConfig->appendChild($dom->createElement('DefaultRootObject', $defaultRootObject));

                $distributionConfig->appendChild($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'));

                $trusted = $dom->createElement('TrustedSigners');
                foreach ($trustedSigners as $id => $type)
                        $trusted->appendChild($id !== '' ? $dom->createElement($type, $id) : $dom->createElement($type));
                $distributionConfig->appendChild($trusted);

                $dom->appendChild($distributionConfig);
                //var_dump($dom->saveXML());
                return $dom->saveXML();
        }


        /**
        * Parse a CloudFront distribution config
        *
        * See http://docs.amazonwebservices.com/AmazonCloudFront/latest/APIReference/index.html?GetDistribution.html
        *
        * @internal Used to parse the CloudFront DistributionConfig node to an array
        * @param object &$node DOMNode
        * @return array
        */
        private static function __parseCloudFrontDistributionConfig(&$node)
        {
                if (isset($node->DistributionConfig))
                        return self::__parseCloudFrontDistributionConfig($node->DistributionConfig);

                $dist = array();
                if (isset($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->Enabled))
                        $dist['enabled'] = (string)$node->Enabled == 'true' ? true : false;

                if (isset($node->S3Origin))
                {
                        if (isset($node->S3Origin->DNSName))
                                $dist['origin'] = (string)$node->S3Origin->DNSName;

                        $dist['originAccessIdentity'] = isset($node->S3Origin->OriginAccessIdentity) ?
                        (string)$node->S3Origin->OriginAccessIdentity : null;
                }

                $dist['defaultRootObject'] = isset($node->DefaultRootObject) ? (string)$node->DefaultRootObject : null;

                $dist['cnames'] = array();
                if (isset($node->CNAME))
                        foreach ($node->CNAME as $cname)
                                $dist['cnames'][(string)$cname] = (string)$cname;

                $dist['trustedSigners'] = array();
                if (isset($node->TrustedSigners))
                        foreach ($node->TrustedSigners as $signer)
                        {
                                if (isset($signer->Self))
                                        $dist['trustedSigners'][''] = 'Self';
                                elseif (isset($signer->KeyPairId))
                                        $dist['trustedSigners'][(string)$signer->KeyPairId] = 'KeyPairId';
                                elseif (isset($signer->AwsAccountNumber))
                                        $dist['trustedSigners'][(string)$signer->AwsAccountNumber] = 'AwsAccountNumber';
                        }

                $dist['comment'] = isset($node->Comment) ? (string)$node->Comment : null;
                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::$__accessKey.':'.self::__getHash($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 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)))));
        }

}

final class S3Request
{
        private $endpoint, $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 = '', $endpoint = 's3.amazonaws.com')
        {
                $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->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.'&';
                                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;
                }
                $url = (S3::$useSSL ? 'https://' : 'http://') . ($this->headers['Host'] !== '' ? $this->headers['Host'] : $this->endpoint) . $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, 'S3/php');

                if (S3::$useSSL)
                {
                        // SSL Validation can now be optional for those with broken OpenSSL installations
                        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, S3::$useSSLValidation ? 2 : 0);
                        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, S3::$useSSLValidation ? 1 : 0);

                        if (S3::$sslKey !== null) curl_setopt($curl, CURLOPT_SSLKEY, S3::$sslKey);
                        if (S3::$sslCert !== null) curl_setopt($curl, CURLOPT_SSLCERT, S3::$sslCert);
                        if (S3::$sslCACert !== null) curl_setopt($curl, CURLOPT_CAINFO, S3::$sslCACert);
                }

                curl_setopt($curl, CURLOPT_URL, $url);

                if (S3::$proxy != null && isset(S3::$proxy['host']))
                {
                        curl_setopt($curl, CURLOPT_PROXY, S3::$proxy['host']);
                        curl_setopt($curl, CURLOPT_PROXYTYPE, S3::$proxy['type']);
                        if (isset(S3::$proxy['user'], S3::$proxy['pass']) && S3::$proxy['user'] != null && S3::$proxy['pass'] != null)
                                curl_setopt($curl, CURLOPT_PROXYUSERPWD, sprintf('%s:%s', S3::$proxy['user'], S3::$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 (S3::hasAuth())
                {
                        // Authorization string (CloudFront stringToSign should only contain a date)
                        if ($this->headers['Host'] == 'cloudfront.amazonaws.com')
                                $headers[] = 'Authorization: ' . S3::__getSignature($this->headers['Date']);
                        else
                        {
                                $headers[] = 'Authorization: ' . S3::__getSignature(
                                        $this->verb."\n".
                                        $this->headers['Content-MD5']."\n".
                                        $this->headers['Content-Type']."\n".
                                        $this->headers['Date'].$amz."\n".
                                        $this->resource
                                );
                        }
        }

                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, $this->data);
                                }
                                else
                                        curl_setopt($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 into XML
                if ($this->response->error === false && isset($this->response->headers['type']) &&
                $this->response->headers['type'] == 'application/xml' && isset($this->response->body))
                {
                        $this->response->body = simplexml_load_string($this->response->body);

                        // Grab S3 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\.-]/", $bucket)) return false;
                if (strstr($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 == '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;
        }

}

class S3Exception extends Exception {
        function __construct($message, $file, $line, $code = 0)
        {
                parent::__construct($message, $code);
                $this->file = $file;
                $this->line = $line;
        }
}