<?php
/**
 * $Id$
 *
 * Copyright (c) 2013, 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 0.5.1
 */
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';
    const STORAGE_CLASS_STANDARD_IA = 'STANDARD_IA';

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

    /**
     * The AWS Access key
     *
     * @var string
     * @access private
     * @static
     */
    private static $__accessKey = null;

    /**
     * AWS Secret Key
     *
     * @var string
     * @access private
     * @static
     */
    private static $__secretKey = null;

    /**
     * SSL Client key
     *
     * @var string
     * @access private
     * @static
     */
    private static $__sslKey = null;

    /**
     * Default delimiter to be used, for example while getBucket().
     * @var string
     * @access public
     * @static
     */
    public static $defDelimiter = null;

    /**
     * AWS URI
     *
     * @var string
     * @acess public
     * @static
     */
    public static $endpoint = '';

    /**
     * AWS Region
     *
     * @var string
     * @acess public
     * @static
     */
    public static $region = '';

    /**
     * Proxy information
     *
     * @var null|array
     * @access public
     * @static
     */
    public static $proxy = null;

    /**
     * Connect using SSL?
     *
     * @var bool
     * @access public
     * @static
     */
    public static $useSSL = false;

    /**
     * Use SSL validation?
     *
     * @var bool
     * @access public
     * @static
     */
    public static $useSSLValidation = true;

    /**
     * Use SSL version
     *
     * @var const
     * @access public
     * @static
     */
    public static $useSSLVersion = CURL_SSLVERSION_TLSv1;

    /**
     * Use PHP exceptions?
     *
     * @var bool
     * @access public
     * @static
     */
    public static $useExceptions = false;

    /**
     * Time offset applied to time()
     * @access private
     * @static
     */
    private static $__timeOffset = 0;

    /**
     * SSL client key
     *
     * @var bool
     * @access public
     * @static
     */
    public static $sslKey = null;

    /**
     * SSL client certfificate
     *
     * @var string
     * @acess public
     * @static
     */
    public static $sslCert = null;

    /**
     * SSL CA cert (only required if you are having problems with your system CA cert)
     *
     * @var string
     * @access public
     * @static
     */
    public static $sslCACert = null;

    /**
     * AWS Key Pair ID
     *
     * @var string
     * @access private
     * @static
     */
    private static $__signingKeyPairId = null;

    /**
     * Key resource, freeSigningKey() must be called to clear it from memory
     *
     * @var bool
     * @access private
     * @static
     */
    private static $__signingKeyResource = false;

    /**
     * CURL progress function callback
     *
     * @var function
     * @access public
     * @static
     */
    public static $progressFunction = null;

    /**
     * AWS Signature Version
     *
     * @var string
     * @acess public
     * @static
     */
    public static $signVer = 'v2';

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


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


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


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

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

        return empty($region) ? 'us-east-1' : $region;
    }


    /**
     * 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' => $user, 'pass' => $pass);
    }


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


    /**
     * Set AWS time correction offset (use carefully)
     *
     * This can be used when an inaccurate system time is generating
     * invalid request signatures.  It should only be used as a last
     * resort when the system time cannot be changed.
     *
     * @param string $offset Time offset (set to zero to use AWS server time)
     * @return void
     */
    public static function setTimeCorrectionOffset($offset = 0)
    {
        if ($offset == 0)
        {
            $rest = new S3Request('HEAD');
            $rest = $rest->getResponse();
            $awstime = $rest->headers['date'];
            $systime = time();
            $offset = $systime > $awstime ? -($systime - $awstime) : ($awstime - $systime);
        }
        self::$__timeOffset = $offset;
    }


    /**
     * Set signing key
     *
     * @param string $keyPairId 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;
    }


    /**
     * Set Signature Version
     *
     * @param string $version of signature ('v4' or 'v2')
     * @return void
     */
    public static function setSignatureVersion($version = 'v2')
    {
        self::$signVer = $version;
    }


    /**
     * 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);
    }

    /**
     * Set progress function
     *
     * @param function $func Progress function
     * @return void
     */
    public static function setProgressFunction($func = null)
    {
        self::$progressFunction = $func;
    }


    /**
     * 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->DisplayName
                );
            $results['buckets'] = array();
            foreach ($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', $delimiter);
        else if (!empty(self::$defDelimiter)) $rest->setParameter('delimiter', self::$defDelimiter);
        $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) $location = self::getRegion();

        if ($location !== false && $location !== "us-east-1")
        {
            $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;
        }
        clearstatcache(false, $file);
        return array('file' => $file, 'size' => filesize($file), 'md5sum' => $md5sum !== false ?
            (is_string($md5sum) ? $md5sum : base64_encode(md5_file($file, true))) : '', 'sha256sum' => hash_file('sha256', $file));
    }


    /**
     * Create input array info for putObject() with a resource
     *
     * @param string $resource Input resource to read from
     * @param integer $bufferSize Input byte size
     * @param string $md5sum MD5 hash to send (optional)
     * @return array | false
     */
    public static function inputResource(&$resource, $bufferSize = false, $md5sum = '')
    {
        if (!is_resource($resource) || (int)$bufferSize < 0)
        {
            self::__triggerError('S3::inputResource(): Invalid resource or buffer size', __FILE__, __LINE__);
            return false;
        }

        // Try to figure out the bytesize
        if ($bufferSize === false)
        {
            if (fseek($resource, 0, SEEK_END) < 0 || ($bufferSize = ftell($resource)) === false)
            {
                self::__triggerError('S3::inputResource(): Unable to obtain resource size', __FILE__, __LINE__);
                return false;
            }
            fseek($resource, 0);
        }

        $input = array('size' => $bufferSize, 'md5sum' => $md5sum);
        $input['fp'] =& $resource;
        return $input;
    }


    /**
     * Put an object
     *
     * @param mixed $input Input data
     * @param string $bucket Bucket name
     * @param string $uri Object URI
     * @param constant $acl ACL constant
     * @param array $metaHeaders Array of x-amz-meta-* headers
     * @param array $requestHeaders Array of request headers or content type as a string
     * @param constant $storageClass Storage class constant
     * @param constant $serverSideEncryption Server-side encryption
     * @return boolean
     */
    public static function putObject($input, $bucket, $uri, $acl = self::ACL_PRIVATE, $metaHeaders = array(), $requestHeaders = array(), $storageClass = self::STORAGE_CLASS_STANDARD, $serverSideEncryption = self::SSE_NONE)
    {
        if ($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)),
            'sha256sum' => hash('sha256', $input)
        );

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

        // Content-Length (required)
        if (isset($input['size']) && $input['size'] >= 0)
            $rest->size = $input['size'];
        else {
            if (isset($input['file'])) {
                clearstatcache(false, $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 => $v)
                strpos($h, 'x-amz-') === 0 ? $rest->setAmzHeader($h, $v) : $rest->setHeader($h, $v);
        elseif (is_string($requestHeaders)) // Support for legacy contentType parameter
            $input['type'] = $requestHeaders;

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

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

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

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

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

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

        if ($rest->response->error === false && $rest->response->code !== 200)
            $rest->response->error = array('code' => $rest->response->code, 'message' => 'Unexpected HTTP status');
        if ($rest->response->error !== false)
        {
            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 $srcBucket Source bucket name
     * @param string $srcUri Source object URI
     * @param string $bucket Destination bucket name
     * @param string $uri Destination object URI
     * @param constant $acl ACL constant
     * @param array $metaHeaders Optional array of x-amz-meta-* headers
     * @param array $requestHeaders Optional array of request headers (content type, disposition, etc.)
     * @param constant $storageClass Storage class constant
     * @return mixed | false
     */
    public static function copyObject($srcBucket, $srcUri, $bucket, $uri, $acl = self::ACL_PRIVATE, $metaHeaders = array(), $requestHeaders = array(), $storageClass = self::STORAGE_CLASS_STANDARD)
    {
        $rest = new S3Request('PUT', $bucket, $uri, self::$endpoint);
        $rest->setHeader('Content-Length', 0);
        foreach ($requestHeaders as $h => $v)
            strpos($h, 'x-amz-') === 0 ? $rest->setAmzHeader($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 up a bucket redirection
     *
     * @param string $bucket Bucket name
     * @param string $location Target host name
     * @return boolean
     */
    public static function setBucketRedirect($bucket = NULL, $location = NULL)
    {
        $rest = new S3Request('PUT', $bucket, '', self::$endpoint);

        if( empty($bucket) || empty($location) ) {
            self::__triggerError("S3::setBucketRedirect({$bucket}, {$location}): Empty parameter.", __FILE__, __LINE__);
            return false;
        }

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

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


    /**
     * Set logging for a bucket
     *
     * @param string $bucket Bucket name
     * @param string $targetBucket Target bucket (where logs are stored)
     * @param string $targetPrefix Log prefix (e,g; domain.com-)
     * @return boolean
     */
    public static function setBucketLogging($bucket, $targetBucket, $targetPrefix = null)
    {
        // The S3 log delivery group has to be added to the target bucket's ACP
        if ($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 = self::__getTime() + $lifetime;
        $uri = str_replace(array('%2F', '%2B'), array('/', '+'), rawurlencode($uri));
        return sprintf(($https ? 'https' : 'http').'://%s/%s?AWSAccessKeyId=%s&Expires=%u&Signature=%s',
            // $hostBucket ? $bucket : $bucket.'.s3.amazonaws.com', $uri, self::$__accessKey, $expires,
            $hostBucket ? $bucket : self::$endpoint.'/'.$bucket, $uri, self::$__accessKey, $expires,
            urlencode(self::__getHash("GET\n\n\n{$expires}\n/{$bucket}/{$uri}")));
    }


    /**
     * 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 $url 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' => self::__getTime() + $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', (self::__getTime() + $lifetime));
        $policy->conditions = array();
        $obj = new stdClass; $obj->bucket = $bucket; array_push($policy->conditions, $obj);
        $obj = new stdClass; $obj->acl = $acl; array_push($policy->conditions, $obj);

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

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

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

        // Create parameters
        $params = new stdClass;
        $params->AWSAccessKeyId = self::$__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
     * @param int $callerReference
     * @return string
     */
    private static function __getCloudFrontInvalidationBatchXML($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'));

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

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

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

        return 'application/octet-stream';
    }


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


    /**
     * Generate the auth string: "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)))));
    }


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

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

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

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

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

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

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

        // CanonicalRequests
        $amzRequests[] = $method;
        $uriQmPos = strpos($uri, '?');
        $amzRequests[] = ($uriQmPos === false ? $uri : substr($uri, 0, $uriQmPos));
        $amzRequests[] = http_build_query($parameters, '', '&', PHP_QUERY_RFC3986);
        // add header as string to requests
        foreach ( $amzHeaders as $k => $v ) {
            $amzRequests[] = $k . ':' . $v;
        }
        // add a blank entry so we end up with an extra line break
        $amzRequests[] = '';
        // SignedHeaders
        $amzRequests[] = implode( ';', array_keys( $amzHeaders ) );
        // payload hash
        $amzRequests[] = $payloadHash;
        // request as string
        $amzRequestStr = implode("\n", $amzRequests);

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

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

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

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

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

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

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

        return $resultHeaders;
    }


}

/**
 * S3 Request class
 *
 * @link http://undesigned.org.za/2007/10/22/amazon-s3-php-class
 * @version 0.5.0-dev
 */
final class S3Request
{
    /**
     * AWS URI
     *
     * @var string
     * @access private
     */
    private $endpoint;

    /**
     * Verb
     *
     * @var string
     * @access private
     */
    private $verb;

    /**
     * S3 bucket name
     *
     * @var string
     * @access private
     */
    private $bucket;

    /**
     * Object URI
     *
     * @var string
     * @access private
     */
    private $uri;

    /**
     * Final object URI
     *
     * @var string
     * @access private
     */
    private $resource = '';

    /**
     * Additional request parameters
     *
     * @var array
     * @access private
     */
    private $parameters = array();

    /**
     * Amazon specific request headers
     *
     * @var array
     * @access private
     */
    private $amzHeaders = array();

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

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

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

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

    /**
     * S3 request respone
     *
     * @var object
     * @access public
     */
    public $response;


    /**
     * Constructor
     *
     * @param string $verb Verb
     * @param string $bucket Bucket name
     * @param string $uri Object URI
     * @param string $endpoint AWS endpoint URI
     * @return mixed
     */
    function __construct($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;
        $this->response->body = null;
        $this->response->headers = array();
    }


    /**
     * 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::$useSSL)
        {
            // Set protocol version
            curl_setopt($curl, CURLOPT_SSLVERSION, S3::$useSSLVersion);

            // 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
            {
                if (S3::$signVer == 'v2')
                {
                    $headers[] = 'Authorization: ' . S3::__getSignature(
                            $this->verb."\n".
                            $this->headers['Content-MD5']."\n".
                            $this->headers['Content-Type']."\n".
                            $this->headers['Date'].$amz."\n".
                            $this->resource
                        );
                } else {
                    $amzHeaders = S3::__getSignatureV4(
                        $this->amzHeaders,
                        $this->headers,
                        $this->verb,
                        $this->uri,
                        $this->data
                    );
                    foreach ($amzHeaders as $k => $v) {
                        $headers[] = $k .': '. $v;
                    }
                }
            }
        }

        curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($curl, CURLOPT_HEADER, false);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, false);
        curl_setopt($curl, CURLOPT_WRITEFUNCTION, array($this, '__responseWriteCallback'));
        curl_setopt($curl, CURLOPT_HEADERFUNCTION, array($this, '__responseHeaderCallback'));
        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);

        // Request types
        switch ($this->verb)
        {
            case 'GET': break;
            case 'PUT': case 'POST': // POST only used for CloudFront
            if ($this->fp !== false)
            {
                curl_setopt($curl, CURLOPT_PUT, true);
                curl_setopt($curl, CURLOPT_INFILE, $this->fp);
                if ($this->size >= 0)
                    curl_setopt($curl, CURLOPT_INFILESIZE, $this->size);
            }
            elseif ($this->data !== false)
            {
                curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $this->verb);
                curl_setopt($curl, CURLOPT_POSTFIELDS, $this->data);
            }
            else
                curl_setopt($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;
        }

        // set curl progress function callback
        if (S3::$progressFunction) {
            curl_setopt($curl, CURLOPT_NOPROGRESS, false);
            curl_setopt($curl, CURLOPT_PROGRESSFUNCTION, S3::$progressFunction);
        }

        // 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\.-]/", $bucket) > 0) return false;
        if (S3::$useSSL && strstr($bucket, '.') !== false) return false;
        if (strstr($bucket, '-.') !== false) return false;
        if (strstr($bucket, '..') !== false) return false;
        if (!preg_match("/^[0-9a-z]/", $bucket)) return false;
        if (!preg_match("/[0-9a-z]$/", $bucket)) return false;
        return true;
    }


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

}

/**
 * S3 exception class
 *
 * @link http://undesigned.org.za/2007/10/22/amazon-s3-php-class
 * @version 0.5.0-dev
 */

class S3Exception extends Exception {
    /**
     * Class constructor
     *
     * @param string $message Exception message
     * @param string $file File in which exception was created
     * @param string $line Line number on which exception was created
     * @param int $code Exception code
     */
    function __construct($message, $file, $line, $code = 0)
    {
        parent::__construct($message, $code);
        $this->file = $file;
        $this->line = $line;
    }
}
