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<?php 
// phpcs:disable WordPress.WP.AlternativeFunctions.file_system_operations_fclose, WordPress.WP.AlternativeFunctions.file_system_operations_fopen, WordPress.WP.AlternativeFunctions.file_system_operations_fwrite, WordPress.WP.AlternativeFunctions.file_system_operations_fgets, WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents, WordPress.WP.AlternativeFunctions.file_system_operations_mkdir, WordPress.WP.AlternativeFunctions.file_system_operations_fread, WordPress.WP.AlternativeFunctions.file_system_operations_chmod, WordPress.WP.AlternativeFunctions.file_system_operations_fputs, WordPress.WP.AlternativeFunctions.file_system_operations_is_writeable, WordPress.WP.AlternativeFunctions.file_system_operations_chown, WordPress.WP.AlternativeFunctions.file_system_operations_chgrp, WordPress.WP.AlternativeFunctions.file_system_operations_touch, WordPress.WP.AlternativeFunctions.file_system_operations_rmdir, WordPress.WP.AlternativeFunctions.file_system_operations_readfile -- Native PHP fileystem function is used for direct control and performance because it can bypass additional layers of abstraction so that no overhead from the WordPress filesystem API's internal handling
// phpcs:disable WordPress.WP.AlternativeFunctions.curl_curl_setopt_array, WordPress.WP.AlternativeFunctions.curl_curl_setopt, WordPress.WP.AlternativeFunctions.curl_curl_init, WordPress.WP.AlternativeFunctions.curl_curl_exec, WordPress.WP.AlternativeFunctions.curl_curl_getinfo, WordPress.WP.AlternativeFunctions.curl_curl_multi_init, WordPress.WP.AlternativeFunctions.curl_curl_multi_add_handle, WordPress.WP.AlternativeFunctions.curl_curl_multi_exec, WordPress.WP.AlternativeFunctions.curl_curl_multi_select, WordPress.WP.AlternativeFunctions.curl_curl_multi_getcontent, WordPress.WP.AlternativeFunctions.curl_curl_multi_remove_handle, WordPress.WP.AlternativeFunctions.curl_curl_multi_close, WordPress.WP.AlternativeFunctions.curl_curl_error, WordPress.WP.AlternativeFunctions.curl_curl_close, WordPress.WP.AlternativeFunctions.curl_curl_errno -- Direct cURL usage is intentional to leverage specific low-level options not available via the WordPress HTTP API.
/**
 * $Id$
 *
 * Copyright (c) 2011, Donovan Schönknecht.  All rights reserved.
 * Portions copyright (c) 2012-2022, David Anderson (https://david.dw-perspective.org.uk).  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
 *
 * Forked originally from:
 * @link http://undesigned.org.za/2007/10/22/amazon-s3-php-class
 */
class UpdraftPlus_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';

private $__accessKey = null; // AWS Access key
	private $__secretKey = null; // AWS Secret key
	private $__sslKey = null;
	private $__session_token = null; //For Vault temporary users
	private $_serverSideEncryption = false;

public $endpoint = 's3.amazonaws.com';
	public $region = 'us-east-1';
	public $proxy = null;

// Added to cope with a particular situation where the user had no permission to check the bucket location, which necessitated using DNS-based endpoints.
	public $use_dns_bucket_name = false;

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

// Added at request of a user using a non-default port.
	public $port = false;

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

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

public $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 boolean $sslCACert SSL Certificate
	 * @param string|null $endpoint Endpoint
	 * @param string|null $session_token The session token returned by AWS for temporary credentials access
	 * @param string $region Region
	 *
	 * @throws Exception If cURL extension is not present
	 *
	 * @return self
	 */
	public function __construct($accessKey = null, $secretKey = null, $useSSL = true, $sslCACert = true, $endpoint = null, $session_token = null, $region = 'us-east-1') {
		if (null !== $accessKey && null !== $secretKey) {
			$this->setAuth($accessKey, $secretKey, $session_token);
		}

$this->setSSL($useSSL, !empty($sslCACert));

$this->sslCACert = $sslCACert;
		if (!empty($endpoint)) {
			$this->endpoint = $endpoint;
		}

$this->region = $region;

if (!function_exists('curl_init')) {
			global $updraftplus;
			$updraftplus->log('The PHP cURL extension must be installed and enabled to use this remote storage method');
			throw new Exception('The PHP cURL extension must be installed and enabled to use this remote storage method');
		}
	}

/**
	 * Set the service endpoint
	 *
	 * @param string $host Hostname
	 *
	 * @return void
	 */
	public function setEndpoint($host) {
		$this->endpoint = $host;
	}
	
	/**
	 * Set Server Side Encryption
	 * Example value: 'AES256'. See: https://docs.aws.amazon.com/AmazonS3/latest/dev/SSEUsingPHPSDK.html
	 *
	 * @param string|boolean $sse Server side encryption standard; or false for none
	 * @return void
	 */
	public function setServerSideEncryption($value) {
		$this->_serverSideEncryption = $value;
	}
	
	/**
	 * Set the service region
	 *
	 * @param string $region Region
	 * @return void
	 */
	public function setRegion($region) {
		$this->region = $region;
	}

/**
	 * Get the service region
	 * Note: Region calculation will be done in methods/s3.php file
	 *
	 * @return string Region
	 */
	public function getRegion() {
		return $this->region;
	}

/**
	 * Set the service port
	 *
	 * @param Integer $port Port number
	 *
	 * @return void
	 */
	public function setPort($port) {
		$this->port = $port;
	}

/**
	 * Set AWS access key and secret key
	 *
	 * @param string $accessKey Access key
	 * @param string $secretKey Secret key
	 *
	 * @return void
	 */
	public function setAuth($accessKey, $secretKey, $session_token = null) {
		$this->__accessKey = $accessKey;
		$this->__secretKey = $secretKey;
		$this->__session_token = $session_token;
	}

/**
	 * Check if AWS keys have been set
	 *
	 * @return boolean
	 */
	public function hasAuth() {
		return (null !== $this->__accessKey && null !== $this->__secretKey);
	}

/**
	 * Return session token, if any
	 *
	 * @return Null|String
	 */
	public function getSessionToken() {
		return $this->__session_token;
	}

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

/**
	 * Get SSL value. Determines whether use it or not.
	 *
	 * @return bool
	 */
	public function getuseSSL() {
		return $this->useSSL;
	}

/**
	 * Get SSL validation value.
	 *
	 * @return bool
	 */
	public function getUseSSLValidation() {
		return $this->useSSLValidation;
	}
	
	/**
	 * Set SSL client certificates (experimental)
	 *
	 * @param string $sslCert SSL client certificate
	 * @param string $sslKey SSL client key
	 * @param string $sslCACert SSL CA cert (only required if you are having problems with your system CA cert)
	 *
	 * @return void
	 */
	public function setSSLAuth($sslCert = null, $sslKey = null, $sslCACert = null) {
		$this->sslCert = $sslCert;
		$this->sslKey = $sslKey;
		$this->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 integer $type CURL proxy type
	 *
	 * @return void
	 */
	public function setProxy($host, $user = null, $pass = null, $type = CURLPROXY_SOCKS5, $port = null) {
		$this->proxy = array('host' => $host, 'type' => $type, 'user' => $user, 'pass' => $pass, 'port' => $port);
	}

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

/**
	 * Set signing key
	 *
	 * @param string $keyPairId AWS Key Pair ID
	 * @param string $signingKey Private Key
	 * @param boolean $isFile Load private key from file, set to false to load string
	 *
	 * @return boolean
	 */
	public function setSigningKey($keyPairId, $signingKey, $isFile = true) {
		$this->__signingKeyPairId = $keyPairId;
		if (($this->__signingKeyResource = openssl_pkey_get_private($isFile ?
		file_get_contents($signingKey) : $signingKey)) !== false) return true;
		$this->_triggerError('UpdraftPlus_S3::setSigningKey(): Unable to open load private key: '.$signingKey, __FILE__, __LINE__);
		return false;
	}

/**
	 * Free signing key from memory, MUST be called on older PHP versions if you are using setSigningKey()
	 *
	 * @return void
	 */
	public function freeSigningKey() {
		if (false !== $this->__signingKeyResource && (!defined('PHP_MAJOR_VERSION') || PHP_MAJOR_VERSION < 8)) { // @phpcs:ignore PHPCompatibility.Constants.NewConstants.php_major_versionFound
			openssl_free_key($this->__signingKeyResource);
		}
	}

/**
	 * Set Signature Version
	 *
	 * @param string $version
	 * @return void
	 */
	public function setSignatureVersion($version = 'v2') {
		$this->signVer = $version;
	}

/**
	 * Internal error handler
	 *
	 * @param string $message Error message
	 * @param string $file Filename
	 * @param integer $line Line number
	 * @param integer $code Error code
	 *
	 * @internal Internal error handler
	 * @throws  UpdraftPlus_S3Exception
	 *
	 * @return void
	 */
	private function _triggerError($message, $file, $line, $code = 0) {
		if ($this->useExceptions) {
			throw new UpdraftPlus_S3Exception($message, $file, $line, $code); // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped -- The escaping should happen when the exception is caught and printed
		} else {
			trigger_error(esc_html($message), E_USER_WARNING); // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_trigger_error -- The trigger_error() function is intentionally used to generate user-level error messages.
		}
	}

/**
	 * Get a list of buckets
	 *
	 * @param boolean $detailed Returns detailed bucket list when true
	 *
	 * @return array | false
	 */
	public function listBuckets($detailed = false) {
		$rest = new UpdraftPlus_S3Request('GET', '', '', $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest = $rest->getResponse();
		if (false === $rest->error && 200 !== $rest->code) {
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		}
		if (false !== $rest->error) {
			$this->_triggerError(sprintf("UpdraftPlus_S3::listBuckets(): [%s] %s", $rest->error['code'],
			$rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		$results = array();
		if (!isset($rest->body->Buckets)) return $results;

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

return $results;
	}

public function useDNSBucketName($use = true, $bucket = '') {
		$this->use_dns_bucket_name = $use;
		return true;
	}

/**
	 * 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 $returnCommonPrefixes Set to true to return CommonPrefixes
	 *
	 * @return array | false
	 */
	public function getBucket($bucket, $prefix = null, $marker = null, $maxKeys = null, $delimiter = null, $returnCommonPrefixes = false) {
		$rest = new UpdraftPlus_S3Request('GET', $bucket, '', $this->endpoint, $this->use_dns_bucket_name, $this);
		if (0 == $maxKeys) $maxKeys = null;
		if (!empty($prefix)) $rest->setParameter('prefix', $prefix);
		if (!empty($marker)) $rest->setParameter('marker', $marker);
		if (!empty($maxKeys)) $rest->setParameter('max-keys', $maxKeys);
		if (!empty($delimiter)) $rest->setParameter('delimiter', $delimiter);
		$response = $rest->getResponse();
		if (false === $response->error && 200 !== $response->code) {
			$response->error = array('code' => $response->code, 'message' => 'Unexpected HTTP status');
		}
		if (false !== $response->error) {
			$this->_triggerError(sprintf("UpdraftPlus_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 (null == $maxKeys && null !== $nextMarker && 'true' == (string)$response->body->IsTruncated)
		do
		{
			$rest = new UpdraftPlus_S3Request('GET', $bucket, '', $this->endpoint, $this->use_dns_bucket_name, $this);
			if (!empty($prefix)) $rest->setParameter('prefix', $prefix);
			$rest->setParameter('marker', $nextMarker);
			if (!empty($delimiter)) $rest->setParameter('delimiter', $delimiter);

if (false == ($response = $rest->getResponse()) || 200 !== $response->code) 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 (false !== $response && 'true' == (string)$response->body->IsTruncated);

return $results;
	}

/**
	 * Put a bucket
	 *
	 * @param  string $bucket Bucket name
	 * @param  string ACL_PRIVATE ACL flag
	 * @param  mixed  $location Set as "EU" to create buckets hosted in Europe
	 * @return boolean
	 */
	public function putBucket($bucket, $acl = self::ACL_PRIVATE, $location = false) {
		$rest = new UpdraftPlus_S3Request('PUT', $bucket, '', $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest->setAmzHeader('x-amz-acl', $acl);

if (false === $location) $location = $this->getRegion();

if (false !== $location && 'us-east-1' !== $location) {
			$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 (false === $rest->error && 200 !== $rest->code) {
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		}

if (false !== $rest->error) {
			$this->_triggerError(sprintf("UpdraftPlus_S3::putBucket({$bucket}, {$acl}, {$location}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return true;
	}

/**
	 * Delete an empty bucket
	 *
	 * @param  string $bucket Bucket name
	 *
	 * @return boolean
	 */
	public function deleteBucket($bucket) {
		$rest = new UpdraftPlus_S3Request('DELETE', $bucket, '', $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest = $rest->getResponse();
		if (false === $rest->error && 204 !== $rest->code) {
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		}

if (false !== $rest->error) {
			$this->_triggerError(sprintf("UpdraftPlus_S3::deleteBucket({$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  $md5sum Use MD5 hash (supply a string if you want to use your own)
	 * @return array | false
	 */
	public function inputFile($file, $md5sum = true) {
		if (!file_exists($file) || !is_file($file) || !is_readable($file)) {
			$this->_triggerError('UpdraftPlus_S3::inputFile(): Unable to open input file: '.$file, __FILE__, __LINE__);
			return false;
		}
		return array('file' => $file, 'size' => filesize($file), 'md5sum' => $md5sum !== false ?
		(is_string($md5sum) ? $md5sum : base64_encode(md5_file($file, true))) : '', '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 $md5sum MD5 hash to send (optional)
	 * @return array | false
	 */
	public function inputResource(&$resource, $bufferSize, $md5sum = '') {
		if (!is_resource($resource) || $bufferSize < 0) {
			$this->_triggerError('UpdraftPlus_S3::inputResource(): Invalid resource or buffer size', __FILE__, __LINE__);
			return false;
		}
		$input = array('size' => $bufferSize, 'md5sum' => $md5sum);
		$input['fp'] =& $resource;
		return $input;
	}

/**
	 * Initiate a multi-part upload (http://docs.amazonwebservices.com/AmazonS3/latest/API/mpUploadInitiate.html)
	 *
	 * @param string $bucket Bucket name
	 * @param string $uri Object URI
	 * @param string $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 string $storageClass Storage class constant
	 *
	 * @return string | false
	 */
	public function initiateMultipartUpload ($bucket, $uri, $acl = self::ACL_PRIVATE, $metaHeaders = array(), $requestHeaders = array(), $storageClass = self::STORAGE_CLASS_STANDARD) {

$rest = new UpdraftPlus_S3Request('POST', $bucket, $uri, $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest->setParameter('uploads','');

// Custom request headers (Content-Type, Content-Disposition, Content-Encoding)
		if (is_array($requestHeaders))
			foreach ($requestHeaders as $h => $v) $rest->setHeader($h, $v);

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

// Set ACL headers
		$rest->setAmzHeader('x-amz-acl', $acl);
		foreach ($metaHeaders as $h => $v) $rest->setAmzHeader('x-amz-meta-'.$h, $v);

// Carry out the HTTP operation
		$rest->getResponse();

if (false === $rest->response->error && 200 !== $rest->response->code) {
			$rest->response->error = array('code' => $rest->response->code, 'message' => 'Unexpected HTTP status');
		}

if (false !== $rest->response->error) {
			$this->_triggerError(sprintf("UpdraftPlus_S3::initiateMultipartUpload(): [%s] %s",
			$rest->response->error['code'], $rest->response->error['message']), __FILE__, __LINE__);
			return false;
		} elseif (isset($rest->response->body)) {
			// DreamObjects already returns a SimpleXMLElement here. Not sure how that works.
			if (is_a($rest->response->body, 'SimpleXMLElement')) {
				$body = $rest->response->body;
			} else {
				$body = new SimpleXMLElement($rest->response->body);
			}
			return (string) $body->UploadId;
		}

// It is a programming error if we reach this line
		return false;

}

/**
	 * Upload a part of a multi-part set (http://docs.amazonwebservices.com/AmazonS3/latest/API/mpUploadUploadPart.html)
	 * The chunk is read into memory, so make sure that you have enough (or patch this function to work another way!)
	 *
	 * @param string $bucket Bucket name
	 * @param string $uri Object URI
	 * @param string $uploadId uploadId returned previously from initiateMultipartUpload
	 * @param integer $partNumber sequential part number to upload
	 * @param string $filePath file to upload content from
	 * @param integer $partSize number of bytes in each part (though final part may have fewer) - pass the same value each time (for this particular upload) - default 5MB (which is Amazon's minimum)
	 *
	 * @return string (ETag) | false
	 */
	public function uploadPart($bucket, $uri, $uploadId, $filePath, $partNumber, $partSize = 5242880) {

$rest = new UpdraftPlus_S3Request('PUT', $bucket, $uri, $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest->setParameter('partNumber', $partNumber);
		$rest->setParameter('uploadId', $uploadId);

// Where to begin
		$fileOffset = ($partNumber - 1 ) * $partSize;

// Download the smallest of the remaining bytes and the part size
		$fileBytes = min(filesize($filePath) - $fileOffset, $partSize);
		if ($fileBytes < 0) $fileBytes = 0;

$rest->setHeader('Content-Type', 'application/octet-stream');
		$rest->data = "";

if ($handle = fopen($filePath, "rb")) {
			if ($fileOffset >0) fseek($handle, $fileOffset);
			$bytes_read = 0;
			while ($fileBytes>0 && $read = fread($handle, max($fileBytes, 524488))) {
				$fileBytes = $fileBytes - strlen($read);
				$bytes_read += strlen($read);
				$rest->data = $rest->data . $read;
			}
			fclose($handle);
		} else {
			return false;
		}

$rest->setHeader('Content-MD5', base64_encode(md5($rest->data, true)));
		$rest->size = $bytes_read;

$rest = $rest->getResponse();
		if (false === $rest->error && 200 !== $rest->code) {
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		}

if (false !== $rest->error) {
			$this->_triggerError(sprintf("UpdraftPlus_S3::uploadPart(): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return $rest->headers['hash'];
	}

/**
	 * Complete a multi-part upload (http://docs.amazonwebservices.com/AmazonS3/latest/API/mpUploadComplete.html)
	 *
	 * @param string $bucket Bucket name
	 * @param string $uri Object URI
	 * @param string $uploadId uploadId returned previously from initiateMultipartUpload
	 * @param array $parts an ordered list of eTags of previously uploaded parts from uploadPart
	 * @return boolean
	 */
	public function completeMultipartUpload($bucket, $uri, $uploadId, $parts) {
		$rest = new UpdraftPlus_S3Request('POST', $bucket, $uri, $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest->setParameter('uploadId', $uploadId);

$xml = "<CompleteMultipartUpload>\n";
		$partno = 1;
		foreach ($parts as $etag) {
			$xml .= "<Part><PartNumber>$partno</PartNumber><ETag>$etag</ETag></Part>\n";
			$partno++;
		}
		$xml .= "</CompleteMultipartUpload>";

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

$rest = $rest->getResponse();
		if (false === $rest->error && 200 !== $rest->code) {
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		}

if (false !== $rest->error) {
			// Special case: when the error means "you've already done that". Turn it into success. See in: https://trello.com/c/6jJoiCG5
			if ('InternalError' == $rest->error['code'] && 'This multipart completion is already in progress' == $rest->error['message']) {
				return true;
			}
			$this->_triggerError(sprintf("UpdraftPlus_S3::completeMultipartUpload(): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return true;

}

/**
	 * Abort a multi-part upload (http://docs.amazonwebservices.com/AmazonS3/latest/API/mpUploadAbort.html)
	 *
	 * @param string $bucket Bucket name
	 * @param string $uri Object URI
	 * @param string $uploadId uploadId returned previously from initiateMultipartUpload
	 * @return boolean
	 */
	// TODO: From this line
	public function abortMultipartUpload ($bucket, $uri, $uploadId) {
		$rest = new UpdraftPlus_S3Request('DELETE', $bucket, $uri, $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest->setParameter('uploadId', $uploadId);
		$rest = $rest->getResponse();
		if (false === $rest->error && 204 !== $rest->code) {
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		}

if (false !== $rest->error) {
			$this->_triggerError(sprintf("UpdraftPlus_S3::abortMultipartUpload(): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return true;
	}

/**
	 * Put an object
	 *
	 * @param mixed $input Input data
	 * @param string $bucket Bucket name
	 * @param string $uri Object URI
	 * @param string $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 string $storageClass Storage class constant
	 *
	 * @return boolean
	 */
	public function putObject($input, $bucket, $uri, $acl = self::ACL_PRIVATE, $metaHeaders = array(), $requestHeaders = array(), $storageClass = self::STORAGE_CLASS_STANDARD) {
		if ($input === false) return false;
		$rest = new UpdraftPlus_S3Request('PUT', $bucket, $uri, $this->endpoint, $this->use_dns_bucket_name, $this);

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

// Content-Length (required)
		if (isset($input['size']) && $input['size'] >= 0) {
			$rest->size = $input['size'];
		} else {
			if (isset($input['file']))
				$rest->size = filesize($input['file']);
			elseif (isset($input['data']))
				$rest->size = strlen($input['data']);
		}

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

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

if ($storageClass !== self::STORAGE_CLASS_STANDARD) // Storage class
			$rest->setAmzHeader('x-amz-storage-class', $storageClass);
			
		if (!empty($this->_serverSideEncryption)) {
			$rest->setAmzHeader('x-amz-server-side-encryption', $this->_serverSideEncryption);
		}
		// We need to post with Content-Length and Content-Type, MD5 is optional
		if ($rest->size >= 0 && (false !== $rest->fp || false !== $rest->data)) {
			$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 (false === $rest->response->error && 200 !== $rest->response->code) {
			$rest->response->error = array('code' => $rest->response->code, 'message' => 'Unexpected HTTP status');
		}

if (false !== $rest->response->error) {
			$this->_triggerError(sprintf("UpdraftPlus_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 string $acl ACL constant
	 * @param array  $metaHeaders Array of x-amz-meta-* headers
	 * @param string $contentType Content type
	 * @param string $storageClass
	 *
	 * @return boolean
	 */
	public function putObjectFile($file, $bucket, $uri, $acl = self::ACL_PRIVATE, $metaHeaders = array(), $contentType = null, $storageClass = self::STORAGE_CLASS_STANDARD) {
		return $this->putObject($this->inputFile($file), $bucket, $uri, $acl, $metaHeaders, $contentType, $storageClass);
	}

/**
	 * Put an object from a string (legacy function)
	 *
	 * @param string $string Input data
	 * @param string $bucket Bucket name
	 * @param string $uri Object URI
	 * @param string $acl ACL constant
	 * @param array $metaHeaders Array of x-amz-meta-* headers
	 * @param string $contentType Content type
	 * @return boolean
	 */
	public function putObjectString($string, $bucket, $uri, $acl = self::ACL_PRIVATE, $metaHeaders = array(), $contentType = 'text/plain') {
		return $this->putObject($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
	 * @param mixed $resume - if $saveTo is a resource, then this is either false or the value for a Range: header; otherwise, a boolean, indicating whether to resume if possible.
	 * @return mixed
	 */
	public function getObject($bucket, $uri, $saveTo = false, $resume = false) {
		$rest = new UpdraftPlus_S3Request('GET', $bucket, $uri, $this->endpoint, $this->use_dns_bucket_name, $this);
		if (false !== $saveTo) {
			if (is_resource($saveTo)) {
				$rest->fp = $saveTo;
				if (!is_bool($resume)) $rest->setHeader('Range', $resume);
			} else {
				if ($resume && file_exists($saveTo)) {
					if (false !== ($rest->fp = @fopen($saveTo, 'ab'))) {
						$rest->setHeader('Range', "bytes=".filesize($saveTo).'-');
						$rest->file = realpath($saveTo);
					} else {
						$rest->response->error = array('code' => 0, 'message' => 'Unable to open save file for writing: '.$saveTo);
					}
				} else {
					if (false !== ($rest->fp = @fopen($saveTo, 'wb')))
						$rest->file = realpath($saveTo);
					else
						$rest->response->error = array('code' => 0, 'message' => 'Unable to open save file for writing: '.$saveTo);
				}
			}
		}
		if (false === $rest->response->error) $rest->getResponse();

if (false === $rest->response->error && ( !$resume && 200 != $rest->response->code) || ( $resume && 206 != $rest->response->code && 200 != $rest->response->code))
			$rest->response->error = array('code' => $rest->response->code, 'message' => 'Unexpected HTTP status');
		if (false !== $rest->response->error) {
			$this->_triggerError(sprintf("UpdraftPlus_S3::getObject({$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 $returnInfo Return response information
	 *
	 * @return mixed | false
	 */
	public function getObjectInfo($bucket, $uri, $returnInfo = true) {
		$rest = new UpdraftPlus_S3Request('HEAD', $bucket, $uri, $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest = $rest->getResponse();
		if (false === $rest->error && (200 !== $rest->code && 404 !== $rest->code))
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		if (false !== $rest->error) {
			$this->_triggerError(sprintf("UpdraftPlus_S3::getObjectInfo({$bucket}, {$uri}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return (200 == $rest->code) ? ($returnInfo ? $rest->headers : true) : false;
	}

/**
	 * Copy an object
	 *
	 * @param string $bucket Source bucket name
	 * @param string $uri Source object URI
	 * @param string $bucket Destination bucket name
	 * @param string $uri Destination object URI
	 * @param string $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 string $storageClass Storage class constant
	 *
	 * @return mixed | false
	 */
	public function copyObject($srcBucket, $srcUri, $bucket, $uri, $acl = self::ACL_PRIVATE, $metaHeaders = array(), $requestHeaders = array(), $storageClass = self::STORAGE_CLASS_STANDARD) {
		$rest = new UpdraftPlus_S3Request('PUT', $bucket, $uri, $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest->setHeader('Content-Length', 0);
		foreach ($requestHeaders as $h => $v) $rest->setHeader($h, $v);
		foreach ($metaHeaders as $h => $v) $rest->setAmzHeader('x-amz-meta-'.$h, $v);
		if (self::STORAGE_CLASS_STANDARD !== $storageClass) // 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 (false === $rest->error && 200 !== $rest->code) {
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		}

if (false !== $rest->error) {
			$this->_triggerError(sprintf("UpdraftPlus_S3::copyObject({$srcBucket}, {$srcUri}, {$bucket}, {$uri}): [%s] %s",
			$rest->error['code'], $rest->error['message']), __FILE__, __LINE__);
			return false;
		}
		return isset($rest->body->LastModified, $rest->body->ETag) ? array(
			'time' => strtotime((string)$rest->body->LastModified),
			'hash' => substr((string)$rest->body->ETag, 1, -1)
		) : false;
	}

/**
	 * Set logging for a bucket
	 *
	 * @param string $bucket Bucket name
	 * @param string $targetBucket Target bucket (where logs are stored)
	 * @param string $targetPrefix Log prefix (e,g; domain.com-)
	 *
	 * @return boolean
	 */
	public function setBucketLogging($bucket, $targetBucket, $targetPrefix = null) {
		// The S3 log delivery group has to be added to the target bucket's ACP
		if (null !== $targetBucket && false !== ($acp = $this->getAccessControlPolicy($targetBucket, ''))) {
			// Only add permissions to the target bucket when they do not exist
			$aclWriteSet = false;
			$aclReadSet = false;
			foreach ($acp['acl'] as $acl)
			if ('Group' == $acl['type'] && 'http://acs.amazonaws.com/groups/s3/LogDelivery' == $acl['uri']) {
				if ($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) $this->setAccessControlPolicy($targetBucket, '', $acp);
		}

$dom = new DOMDocument;
		$bucketLoggingStatus = $dom->createElement('BucketLoggingStatus');
		$bucketLoggingStatus->setAttribute('xmlns', 'http://s3.amazonaws.com/doc/2006-03-01/');
		if (null !== $targetBucket) {
			if (null == $targetPrefix) $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 UpdraftPlus_S3Request('PUT', $bucket, '', $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest->setParameter('logging', null);
		$rest->data = $dom->saveXML();
		$rest->size = strlen($rest->data);
		$rest->setHeader('Content-Type', 'application/xml');
		$rest = $rest->getResponse();
		if (false === $rest->error && 200 !== $rest->code) {
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		}

if (false !== $rest->error) {
			$this->_triggerError(sprintf("UpdraftPlus_S3::setBucketLogging({$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 $bucket Bucket name
	 *
	 * @return array | false
	 */
	public function getBucketLogging($bucket) {
		$rest = new UpdraftPlus_S3Request('GET', $bucket, '', $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest->setParameter('logging', null);
		$rest = $rest->getResponse();
		if (false === $rest->error && 200 !== $rest->code) {
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		}

if (false !== $rest->error) {
			$this->_triggerError(sprintf("UpdraftPlus_S3::getBucketLogging({$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 $bucket Bucket name
	 *
	 * @return boolean
	 */
	public function disableBucketLogging($bucket) {
		return $this->setBucketLogging($bucket, null);
	}

/**
	 * Get a bucket's location
	 *
	 * @param string $bucket Bucket name
	 *
	 * @return String | Boolean - A boolean result will be false, indicating failure.
	 * 
	 */
	public function getBucketLocation($bucket) {
		$rest = new UpdraftPlus_S3Request('GET', $bucket, '', $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest->setParameter('location', null);
		$rest = $rest->getResponse();
		
		global $updraftplus;

if (false !== $rest->error && 'AuthorizationHeaderMalformed' == $rest->error['code'] && !empty($rest->error['region'])) {
			// The location request was sent to the wrong region... but the response tells us the correct region, which is all we wanted.
			return $rest->error['region'];
		}
		
		if (false === $rest->error && 200 !== $rest->code) {
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		}
		if (false !== $rest->error) {
			$this->_triggerError(sprintf("UpdraftPlus_S3::getBucketLocation({$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 $acp Access Control Policy Data (same as the data returned from getAccessControlPolicy)
	 *
	 * @return boolean
	 */
	public function setAccessControlPolicy($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 ('Group' == $g['type']) {
				// 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 UpdraftPlus_S3Request('PUT', $bucket, $uri, $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest->setParameter('acl', null);
		$rest->data = $dom->saveXML();
		$rest->size = strlen($rest->data);
		$rest->setHeader('Content-Type', 'application/xml');
		$rest = $rest->getResponse();
		if (false === $rest->error && 200 !== $rest->code)  {
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		}

if (false !== $rest->error) {
			$this->_triggerError(sprintf("UpdraftPlus_S3::setAccessControlPolicy({$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 $uri Object URI
	 * @return mixed | false
	 */
	public function getAccessControlPolicy($bucket, $uri = '') {
		$rest = new UpdraftPlus_S3Request('GET', $bucket, $uri, $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest->setParameter('acl', null);
		$rest = $rest->getResponse();
		if (false === $rest->error && 200 !== $rest->code) {
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		}

if (false !== $rest->error) {
			$this->_triggerError(sprintf("UpdraftPlus_S3::getAccessControlPolicy({$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 $uri Object URI
	 *
	 * @return boolean
	 */
	public function deleteObject($bucket, $uri) {
		$rest = new UpdraftPlus_S3Request('DELETE', $bucket, $uri, $this->endpoint, $this->use_dns_bucket_name, $this);
		$rest = $rest->getResponse();
		if (false === $rest->error && 204 !== $rest->code) {
			$rest->error = array('code' => $rest->code, 'message' => 'Unexpected HTTP status');
		}

if (false !== $rest->error) {
			$this->_triggerError(sprintf("UpdraftPlus_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 function getAuthenticatedURL($bucket, $uri, $lifetime, $hostBucket = false, $https = false) {
		$expires = time() + $lifetime;
		$uri = str_replace(array('%2F', '%2B'), array('/', '+'), rawurlencode($uri));
		return sprintf(($https ? 'https' : 'http').'://%s/%s?AWSAccessKeyId=%s&Expires=%u&Signature=%s',
		// $hostBucket ? $bucket : $bucket.'.s3.amazonaws.com', $uri, $this->__accessKey, $expires,
		$hostBucket ? $bucket : 's3.amazonaws.com/'.$bucket, $uri, $this->__accessKey, $expires,
		urlencode($this->__getHash("GET\n\n\n{$expires}\n/{$bucket}/{$uri}")));
	}

/**
	 * Get MIME type for file
	 *
	 * @internal Used to get mime types
	 *
	 * @param string &$file File path
	 *
	 * @return string
	 */
	public function __getMimeType(&$file) {// phpcs:ignore PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.MethodDoubleUnderscore -- Method name "UpdraftPlus_S3Request::_responseHeaderCallback" is discouraged; PHP has reserved all method names with a double underscore prefix for future use.
		$type = false;
		// Fileinfo documentation says fileinfo_open() will use the
		// MAGIC env var for the magic file
		$env_magic = UpdraftPlus_Manipulation_Functions::fetch_superglobal('env', 'MAGIC');
		if (extension_loaded('fileinfo') && isset($env_magic) &&
		false !== ($finfo = finfo_open(FILEINFO_MIME, $env_magic))) {// phpcs:ignore PHPCompatibility.FunctionUse.NewFunctions.finfo_openFound -- The function finfo_open() is not present in PHP version 5.2 or earlier
			if (false !== ($type = finfo_file($finfo, $file))) {// phpcs:ignore PHPCompatibility.FunctionUse.NewFunctions.finfo_fileFound -- The function finfo_file() is not present in PHP version 5.2 or earlier
				// 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));
			}
			if (version_compare(PHP_VERSION, '8.1', '<')) {
				finfo_close($finfo);// phpcs:ignore PHPCompatibility.FunctionUse.NewFunctions.finfo_closeFound -- The function finfo_close() is not present in PHP version 5.2 or earlier
			} else {
				unset($finfo); // On PHP 8.1+, finfo_close() is a no-op (deprecated in 8.5); unset the handle instead.
			}

// If anyone is still using mime_content_type()
		} elseif (function_exists('mime_content_type')) {
			$type = trim(mime_content_type($file));
		}

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

// Otherwise do it the old fashioned way
		static $exts = array(
			'jpg' => 'image/jpeg', 'gif' => 'image/gif', 'png' => 'image/png',
			'tif' => 'image/tiff', 'tiff' => 'image/tiff', 'ico' => 'image/x-icon',
			'swf' => 'application/x-shockwave-flash', 'pdf' => 'application/pdf',
			'zip' => 'application/zip', 'gz' => 'application/x-gzip',
			'tar' => 'application/x-tar', 'bz' => 'application/x-bzip',
			'bz2' => 'application/x-bzip2', 'txt' => 'text/plain',
			'asc' => 'text/plain', 'htm' => 'text/html', 'html' => 'text/html',
			'css' => 'text/css', 'js' => 'text/javascript',
			'xml' => 'text/xml', 'xsl' => 'application/xsl+xml',
			'ogg' => 'application/ogg', 'mp3' => 'audio/mpeg', 'wav' => 'audio/x-wav',
			'avi' => 'video/x-msvideo', 'mpg' => 'video/mpeg', 'mpeg' => 'video/mpeg',
			'mov' => 'video/quicktime', 'flv' => 'video/x-flv', 'php' => 'text/x-php'
		);
		$ext = strtolower(pathInfo($file, PATHINFO_EXTENSION));
		return isset($exts[$ext]) ? $exts[$ext] : 'application/octet-stream';
	}

/**
	 * Generate the auth string: "AWS AccessKey:Signature"
	 *
	 * @internal Used by UpdraftPlus_S3Request::getResponse()
	 *
	 * @param string $string String to sign
	 *
	 * @return string
	 */
	public function __getSignature($string) {// phpcs:ignore PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.MethodDoubleUnderscore -- Method name "UpdraftPlus_S3Request::_responseHeaderCallback" is discouraged; PHP has reserved all method names with a double underscore prefix for future use.
		return 'AWS '.$this->__accessKey.':'.$this->__getHash($string);
	}

/**
	 * Creates a HMAC-SHA1 hash
	 *
	 * This uses the hash extension if loaded
	 *
	 * @internal Used by __getSignature()
	 *
	 * @param string $string String to sign
	 *
	 * @return string
	 */
	private function __getHash($string) {// phpcs:ignore PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.MethodDoubleUnderscore -- Method name "UpdraftPlus_S3Request::_responseHeaderCallback" is discouraged; PHP has reserved all method names with a double underscore prefix for future use.
		return base64_encode(extension_loaded('hash') ?
		hash_hmac('sha1', $string, $this->__secretKey, true) : pack('H*', sha1(
		(str_pad($this->__secretKey, 64, chr(0x00)) ^ (str_repeat(chr(0x5c), 64))) .
		pack('H*', sha1((str_pad($this->__secretKey, 64, chr(0x00)) ^
		(str_repeat(chr(0x36), 64))) . $string)))));
	}

/**
	 * Generate the headers for AWS Signature V4
	 *
	 * @internal Used by UpdraftPlus_S3Request::getResponse()
	 * @param array $aHeaders amzHeaders
	 * @param array $headers
	 * @param string $method
	 * @param string $uri
	 * @param string $data
	 *
	 * @return array $headers
	 */
	public function __getSignatureV4($aHeaders, $headers, $method = 'GET', $uri = '', $data = '', $service = 's3') {// phpcs:ignore PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.MethodDoubleUnderscore -- Method name "UpdraftPlus_S3Request::_responseHeaderCallback" is discouraged; PHP has reserved all method names with a double underscore prefix for future use.
		$region = $this->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);
		}

// payload
		$payloadHash = isset($amzHeaders['x-amz-content-sha256']) ? $amzHeaders['x-amz-content-sha256'] : hash('sha256', $data);
		if (!isset($amzHeaders['x-amz-content-sha256']) && (!defined('UPDRAFTPLUS_S3_EXCLUDE_SIGV4_CONTENT_SHA256_HEADER') || !UPDRAFTPLUS_S3_EXCLUDE_SIGV4_CONTENT_SHA256_HEADER)) $amzHeaders['x-amz-content-sha256'] = $payloadHash;
		uksort($amzHeaders, 'strcmp');

// parameters
		$parameters = array();
		if (strpos($uri, '?')) {
			list($uri, $query_str) = @explode('?', $uri);
			parse_str($query_str, $parameters);
			// "Sort the parameter names by character code point in ascending order. Parameters with duplicate names should be sorted by value. For example, a parameter name that begins with the uppercase letter F precedes a parameter name that begins with a lowercase letter b."
			// N.B. Here we've not looked at the values as we don't expect duplicates
			uksort($parameters, 'strcmp');
		}

// Canonical Requests
		// "Start with the HTTP request method (GET, PUT, POST, etc.)"
		$amzRequests[] = $method;
		$uriQmPos = strpos($uri, '?');
		$amzRequests[] = (false === $uriQmPos ? $uri : substr($uri, 0, $uriQmPos));
		$built_queries = '';
		foreach ($parameters as $query => $val) {
			if (!empty($built_queries)) $built_queries .= '&';
			$built_queries .= "$query=".rawurlencode($val);
		}
		$amzRequests[] = $built_queries;

// add headers 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' . $this->__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=' . $this->__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;
	}

/**
	 * Create IAM user
	 *
	 * @param array $options
	 *
	 * @return array $response
	 */
	public function createUser($options) {
		$rest = new UpdraftPlus_IAMRequest('POST', '', 'iam.amazonaws.com', $this);

$rest->setParameter('Action', 'CreateUser');
		$rest->setParameter('Version', '2010-05-08');
		$rest->setParameter('Path', $options['Path']);
		$rest->setParameter('UserName', $options['UserName']);

$response = $rest->getResponse();

if (isset($response['body']['CreateUserResult'])) {
			$response['User'] = $response['body']['CreateUserResult']['User'];
			unset($response['body']['CreateUserResult']);
		}

return $response;
	}

/**
	 * Create access key for IAM user
	 *
	 * @param string $username
	 *
	 * @return array $response
	 */
	public function createAccessKey($username) {
		$rest = new UpdraftPlus_IAMRequest('POST', '', 'iam.amazonaws.com', $this);

$rest->setParameter('Action', 'CreateAccessKey');
		$rest->setParameter('Version', '2010-05-08');
		$rest->setParameter('UserName', $username);

$response = $rest->getResponse();

if (isset($response['body']['CreateAccessKeyResult'])) {
			$response['AccessKey'] = $response['body']['CreateAccessKeyResult']['AccessKey'];
			unset($response['body']['CreateAccessKeyResult']);
		}

return $response;
	}

/**
	 * Put user policy IAM user
	 *
	 * @param array $options
	 *
	 * @return array $response
	 */
	public function putUserPolicy($options) {
		$rest = new UpdraftPlus_IAMRequest('POST', '', 'iam.amazonaws.com', $this);

$rest->setParameter('Action', 'PutUserPolicy');
		$rest->setParameter('UserName', $options['UserName']);
		$rest->setParameter('PolicyName', $options['PolicyName']);
		$rest->setParameter('PolicyDocument', preg_replace("/[\n\r ]/", '', $options['PolicyDocument']));
		$rest->setParameter('Version', '2010-05-08');

$response = $rest->getResponse();

if (isset($response['body']['PutUserPolicyResult'])) {
			$response['AccessKey'] = $response['body']['PutUserPolicyResult']['UserPolicy'];
			unset($response['body']['PutUserPolicyResult']);
		}

return $response;
	}

}

abstract class UpdraftPlus_AWSRequest {

protected $endpoint, $verb, $bucket, $uri, $resource = '', $parameters = array(),
	$amzHeaders = array(), $headers = array(
		'Host' => '', 'Date' => '', 'Content-MD5' => '', 'Content-Type' => ''
	);
	public $fp = false, $size = 0, $data = false, $response;
	
	protected $s3;

/**
	 * 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;
	}

/**
	 * Sort compare for meta headers
	 *
	 * @internal Used to sort x-amz meta headers
	 *
	 * @param string $a String A
	 * @param string $b String B
	 *
	 * @return integer
	 */
	public function __sortMetaHeadersCmp($a, $b) {// phpcs:ignore PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.MethodDoubleUnderscore -- Method name "UpdraftPlus_S3Request::_responseHeaderCallback" is discouraged; PHP has reserved all method names with a double underscore prefix for future use.
		$lenA = strpos($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 $data Data
	 *
	 * @return integer
	 */
	public function _responseWriteCallback($curl, $data) {
		if (in_array($this->response->code, array(200, 206)) && false !== $this->fp)
			return fwrite($this->fp, $data);
		else
			$this->response->body = (empty($this->response->body)) ? $data : $this->response->body.$data;
		return strlen($data);
	}

/**
	 * Check DNS conformity (suitability for Host: header addressing).
	 * Many of the rules below apply to all new buckets; but some don't apply to legacy buckets created before certain dates.
	 * 
	 * This is used to rule out invalid names
	 *
	 * @see https://docs.aws.amazon.com/AmazonS3/latest/userguide/bucketnamingrules.html
	 *
	 * @param  string $bucket Bucket name
	 *
	 * @return boolean
	 */
	public function _dnsBucketName($bucket) {
		// A DNS bucket name cannot have len>63
		if (strlen($bucket) > 63) return false;
		// A DNS bucket name must not have a character in other than a-z, 0-9, . -
		if (preg_match("/[^a-z0-9\.-]/", $bucket)) return false;
		// A DNS bucket name cannot contain -.
		if (false !== strstr($bucket, '-.')) return false;
		// A DNS bucket name cannot contain ..
		if (false !== strstr($bucket, '..')) return false;
		// A DNS bucket name must begin with 0-9a-z
		if (!preg_match("/^[0-9a-z]/", $bucket)) return false;
		# A DNS bucket name must end with 0-9 a-z
		// (!preg_match("/[0-9a-z]$/", $bucket)) return false;
		return true;
	}

/**
	 * CURL header callback
	 *
	 * @param resource $curl CURL resource
	 * @param string $data Data
	 *
	 * @return integer
	 */
	protected function _responseHeaderCallback($curl, $data) {
		if (($strlen = strlen($data)) <= 2) return $strlen;
		if (preg_match('#^HTTP/\S+ (\d\d\d)#', $data, $matches)) {
			$this->response->code = (int)$matches[1];
		} else {
			$data = trim($data);
			if (false === strpos($data, ': ')) return $strlen;
			list($header, $value) = explode(': ', $data, 2);
			if ('last-modified' == strtolower($header))
				$this->response->headers['time'] = strtotime($value);
			elseif ('content-length' == strtolower($header))
				$this->response->headers['size'] = (int)$value;
			elseif ('content-type' == strtolower($header))
				$this->response->headers['type'] = $value;
			elseif ('etag' == strtolower($header))
				$this->response->headers['hash'] = '"' == $value[0] ? substr($value, 1, -1) : $value;
			elseif (preg_match('/^x-amz-meta-.*$/i', $header))
				$this->response->headers[strtolower($header)] = $value;
		}
		return $strlen;
	}

}

final class UpdraftPlus_S3Request extends UpdraftPlus_AWSRequest {

/**
	 * Constructor
	 *
	 * @param string  $verb Verb
	 * @param string  $bucket Bucket name
	 * @param string  $uri Object URI
	 * @param string  $endpoint Endpoint of storage
	 * @param boolean $use_dns_bucket_name - if set, then constructs an endpoint based upon the bucket name as well as $endpoint (otherwise, uses $endpoint only)
	 * @param object  $s3 S3 Object that calls these requests
	 *
	 * @return mixed
	 */
	public function __construct($verb, $bucket = '', $uri = '', $endpoint = 's3.amazonaws.com', $use_dns_bucket_name = false, $s3 = null) {
		$this->endpoint = $endpoint;
		$this->verb = $verb;
		$this->bucket = $bucket;
		$this->uri = $uri !== '' ? '/'.str_replace('%2F', '/', rawurlencode($uri)) : '/';
		$this->s3 = $s3;

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

if ('' !== $this->bucket) {
			// Use host-style access if the consumer requested it and we don't see a problem.
			if ($use_dns_bucket_name && $this->_dnsBucketName($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;
	}

/**
	 * 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 (null == $value || '' == $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('logging', $this->parameters) ||
			array_key_exists('partNumber', $this->parameters) ||
			array_key_exists('uploads', $this->parameters) ||
			array_key_exists('uploadId', $this->parameters))
				$this->resource .= $query;
		}
		$url = ($this->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);

$curl = curl_init();
		
		global $updraftplus;
		curl_setopt($curl, CURLOPT_USERAGENT, 'S3/UpdraftPlus-'.$updraftplus->version.' PHP/'.PHP_VERSION);

if ($this->s3->useSSL) {
			// SSL Validation can now be optional for those with broken OpenSSL installations
			curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, $this->s3->useSSLValidation ? 2 : 0);
			curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, $this->s3->useSSLValidation ? 1 : 0);

if (null !== $this->s3->sslKey) curl_setopt($curl, CURLOPT_SSLKEY, $this->s3->sslKey);
			if (null !== $this->s3->sslCert) curl_setopt($curl, CURLOPT_SSLCERT, $this->s3->sslCert);
			if (null !== $this->s3->sslCACert && file_exists($this->s3->sslCACert)) curl_setopt($curl, CURLOPT_CAINFO, $this->s3->sslCACert);
		}

curl_setopt($curl, CURLOPT_URL, $url);

$wp_proxy = new WP_HTTP_Proxy();

if (null != $this->s3->proxy && isset($this->s3->proxy['host']) && $wp_proxy->send_through_proxy($url)) {
			curl_setopt($curl, CURLOPT_PROXY, $this->s3->proxy['host']);
			curl_setopt($curl, CURLOPT_PROXYTYPE, $this->s3->proxy['type']);
			if (!empty($this->s3->proxy['port'])) curl_setopt($curl,CURLOPT_PROXYPORT, $this->s3->proxy['port']);
			if (isset($this->s3->proxy['user'], $this->s3->proxy['pass']) && null != $this->s3->proxy['user'] && null != $this->s3->proxy['pass']) {
				curl_setopt($curl, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
				curl_setopt($curl, CURLOPT_PROXYUSERPWD, sprintf('%s:%s', $this->s3->proxy['user'], $this->s3->proxy['pass']));
			}
		}

// Headers
		
		if ($this->s3->hasAuth()) {
			$session_token = $this->s3->getSessionToken();
			// https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_temp_use-resources.html#RequestWithSTS
			if ('' != $session_token) $this->setAmzHeader('X-Amz-Security-Token', $session_token);
		}
		
		$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 ($this->s3->hasAuth()) {
			// Authorization string (CloudFront stringToSign should only contain a date)
			if ('cloudfront.amazonaws.com' == $this->headers['Host']) {
				$headers[] = 'Authorization: ' . $this->s3->__getSignature($this->headers['Date']);
			} else {
				if ('v2' === $this->s3->signVer) {
					$headers[] = 'Authorization: ' . $this->s3->__getSignature(
							$this->verb."\n".
							$this->headers['Content-MD5']."\n".
							$this->headers['Content-Type']."\n".
							$this->headers['Date'].$amz."\n".
							$this->resource
						);
				} else {
					// Use V4
					if (isset($this->headers['Content-MD5']) && '' == $this->headers['Content-MD5']) unset($this->headers['Content-MD5']); // content-md5 is part of v2 signature, but it may be presented in the HTTP headers whilst doing PUT requests, we've seen this happening on Amazon S3 storage when testing credentials, but it shouldn't be added to v4's SignedHeaders if it's empty so we unset it
					if (isset($this->headers['Content-Type']) && '' == $this->headers['Content-Type']) unset($this->headers['Content-Type']); // content-type may get included in the HTTP headers, but if it's not presented then it shouldn't be added to SignedHeaders
					$amzHeaders = $this->s3->__getSignatureV4(
						$this->amzHeaders,
						$this->headers,
						$this->verb,
						$this->uri,
						$this->data
					);
					foreach ($amzHeaders as $k => $v) {
						$headers[] = $k . ': ' . $v;
					}
				}
			}
		}

if (false !== $this->s3->port) curl_setopt($curl, CURLOPT_PORT, $this->s3->port);
		curl_setopt($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':
				if (false !== $this->fp) {
					curl_setopt($curl, CURLOPT_PUT, true);
					curl_setopt($curl, CURLOPT_INFILE, $this->fp);
					if ($this->size >= 0) {
						curl_setopt($curl, CURLOPT_INFILESIZE, $this->size);
					}
				} elseif (false !== $this->data) {
					curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $this->verb);
					curl_setopt($curl, CURLOPT_POSTFIELDS, $this->data);
					curl_setopt($curl, CURLOPT_INFILESIZE, strlen($this->data));
				} else {
					curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $this->verb);
				}
			break;
			case 'HEAD':
				curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'HEAD');
				curl_setopt($curl, CURLOPT_NOBODY, true);
			break;
			case 'DELETE':
				curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'DELETE');
			break;
			default: break;
		}

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

if (version_compare(PHP_VERSION, '8.0', '<')) {
			@curl_close($curl);
		} else {
			unset($curl);
		}

if (false !== $this->response->error && preg_match('/\.amazonaws\.com$/i', $this->endpoint) && 'PUT' === $this->verb) {
			$curl = curl_init();
			curl_setopt($curl, CURLOPT_URL, 'https://tls12.browserleaks.com/');
			curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
			curl_setopt($curl, CURLOPT_FAILONERROR, true);
			curl_setopt($curl, CURLOPT_HEADER, false);
			curl_setopt($curl, CURLOPT_TIMEOUT, 10);
			curl_setopt($curl, CURLOPT_VERBOSE, true);
			$response = curl_exec($curl);
			$info = curl_getinfo($curl);
			if (version_compare(PHP_VERSION, '8.0', '<')) {
				curl_close($curl);
			} else {
				unset($curl);
			}
			
			if (200 === $info['http_code'] && 'TLS 1.2' !== $response) {
				$updraftplus->log('Connecting to Amazon S3 failed. Your PHP installation failed a TLS v1.2 connection test, which is the minimum version required by Amazon. Please ask your webserver support how to upgrade your PHP and cURL library versions to use non-obsolete TLS versions.');
				$updraftplus->log(__('Connecting to Amazon S3 failed.', 'updraftplus').' '.__('Your PHP installation failed a TLS v1.2 connection test, which is the minimum version required by Amazon.', 'updraftplus').' '.__('Please ask your webserver support how to upgrade your PHP and cURL library versions to use non-obsolete TLS versions.', 'updraftplus'), 'warning');
			}
		}

// Parse body into XML
		// The case in which there is not application/xml content-type header is to support a DreamObjects case seen, April 2018
		if (false === $this->response->error && isset($this->response->body) && ((isset($this->response->headers['type']) && false  !== strpos($this->response->headers['type'], 'application/xml')) || (!isset($this->response->headers['type']) && 0 === strpos($this->response->body, '<?xml')))) {
			$this->response->body = simplexml_load_string($this->response->body);

// Grab S3 errors
			if (!in_array($this->response->code, array(200, 204, 206)) &&
			isset($this->response->body->Code)) {
				$this->response->error = array(
					'code' => (string)$this->response->body->Code,
				);
				
				// Useful for debugging
				// $this->response->error['body_xml'] = $this->response->body->asXML();
				
				if (isset($this->response->body->Region)) {
					$this->response->error['region'] = $this->response->body->Region;
				} elseif (false !== stripos($this->response->body->Code, 'AuthorizationHeaderMalformed') && !empty($this->response->body->Message) && preg_match("#the region '[^']+' is wrong; expecting '([^']+)'#i", $this->response->body->Message, $matches)) {
					$this->response->error['region'] = $matches[1];
				}
				$this->response->error['message'] = isset($this->response->body->Message) ? $this->response->body->Message : '';
				if (isset($this->response->body->Resource))
					$this->response->error['resource'] = (string)$this->response->body->Resource;
				unset($this->response->body);
			}
		}
		
		// Clean up file resources
		if (false !== $this->fp && is_resource($this->fp)) fclose($this->fp);

return $this->response;
	}

}

final class UpdraftPlus_IAMRequest extends UpdraftPlus_AWSRequest {

/**
	 * Constructor
	 *
	 * @param string  $verb Verb
	 * @param string  $uri Object URI
	 * @param string  $endpoint Endpoint of storage
	 * @param object  $s3 S3 Object that calls these requests
	 *
	 * @return mixed
	 */
	public function __construct($verb, $uri = '', $endpoint = 'iam.amazonaws.com', $s3 = null) {
		$this->endpoint = $endpoint;
		$this->verb = $verb;
		$this->uri = $uri !== '' ? '/'.str_replace('%2F', '/', rawurlencode($uri)) : '/';
		$this->s3 = $s3;

$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;
	}

/**
	 * Get the IAM 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 (null == $value || '' == $value) $query .= $var.'&';
				else $query .= $var.'='.rawurlencode($value).'&';
			$query = substr($query, 0, -1);
			$this->uri .= $query;

if (array_key_exists('Action', $this->parameters) ||
			array_key_exists('Path', $this->parameters) ||
			array_key_exists('UserName', $this->parameters) ||
			array_key_exists('PolicyName', $this->parameters) ||
			array_key_exists('PolicyDocument', $this->parameters) ||
			array_key_exists('Region', $this->parameters) ||
			array_key_exists('Version', $this->parameters))
				$this->resource .= $query;
		}
		$url = 'https://' . ('' !== $this->headers['Host'] ? $this->headers['Host'] : $this->endpoint) . $this->uri;

$curl = curl_init();
		
		global $updraftplus;
		curl_setopt($curl, CURLOPT_USERAGENT, 'S3/UpdraftPlus-'.$updraftplus->version.' PHP/'.PHP_VERSION);

curl_setopt($curl, CURLOPT_URL, $url);

$wp_proxy = new WP_HTTP_Proxy();

// 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 ($this->s3->hasAuth()) {
			if ('v2' === $this->s3->signVer) {
				$headers[] = 'Authorization: ' . $this->s3->__getSignature(
						$this->verb."\n".
						$this->headers['Content-MD5']."\n".
						$this->headers['Content-Type']."\n".
						$this->headers['Date'].$amz."\n".
						$this->resource
					);
			} else {
				// Use V4
				$amzHeaders = $this->s3->__getSignatureV4(
					$this->amzHeaders,
					$this->headers,
					$this->verb,
					$this->uri,
					$this->data,
					'iam'
				);
				foreach ($amzHeaders as $k => $v) {
					$headers[] = $k . ': ' . $v;
				}
			}
		}

if (false !== $this->s3->port) curl_setopt($curl, CURLOPT_PORT, $this->s3->port);
		curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
		curl_setopt($curl, CURLOPT_HEADER, false);
		curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($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': 
			case 'POST':
				if (false !== $this->fp) {
					curl_setopt($curl, CURLOPT_PUT, true);
					curl_setopt($curl, CURLOPT_INFILE, $this->fp);
					if ($this->size >= 0) {
						curl_setopt($curl, CURLOPT_INFILESIZE, $this->size);
					}
				} elseif (false !== $this->data) {
					curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $this->verb);
					curl_setopt($curl, CURLOPT_POSTFIELDS, $this->data);
					curl_setopt($curl, CURLOPT_INFILESIZE, strlen($this->data));
				} else {
					curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $this->verb);
				}
			break;
			default: break;
		}

if (version_compare(PHP_VERSION, '8.0', '<')) {
			@curl_close($curl);
		} else {
			unset($curl);
		}

// Parse body into XML
		// The case in which there is not application/xml content-type header is to support a DreamObjects case seen, April 2018
		if (
			isset($this->response->body) && 
			((isset($this->response->headers['type']) && false !== strpos($this->response->headers['type'], 'text/xml')) || 
			(!isset($this->response->headers['type']) && 0 === strpos($this->response->body, '<?xml')))) {
			
			$this->response->body = simplexml_load_string($this->response->body);
		}

$this->response = json_decode(json_encode($this->response), true); // convert to array

return $this->response;
	}

}

Editing: S3.php

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