<?php
namespace Aws\S3;
use Aws\HashingStream;
use Aws\Multipart\AbstractUploader;
use Aws\PhpHash;
use Aws\ResultInterface;
use GuzzleHttp\Psr7;
use Psr\Http\Message\StreamInterface as Stream;
/**
* Encapsulates the execution of a multipart upload to S3 or Glacier.
*/
class MultipartUploader extends AbstractUploader
{
use MultipartUploadingTrait;
const PART_MIN_SIZE = 5242880;
const PART_MAX_SIZE = 5368709120;
const PART_MAX_NUM = 10000;
/**
* Creates a multipart upload for an S3 object.
*
* The valid configuration options are as follows:
*
* - acl: (string) ACL to set on the object being upload. Objects are
* private by default.
* - before_complete: (callable) Callback to invoke before the
* `CompleteMultipartUpload` operation. The callback should have a
* function signature like `function (Aws\Command $command) {...}`.
* - before_initiate: (callable) Callback to invoke before the
* `CreateMultipartUpload` operation. The callback should have a function
* signature like `function (Aws\Command $command) {...}`.
* - before_upload: (callable) Callback to invoke before any `UploadPart`
* operations. The callback should have a function signature like
* `function (Aws\Command $command) {...}`.
* - bucket: (string, required) Name of the bucket to which the object is
* being uploaded.
* - concurrency: (int, default=int(5)) Maximum number of concurrent
* `UploadPart` operations allowed during the multipart upload.
* - key: (string, required) Key to use for the object being uploaded.
* - part_size: (int, default=int(5242880)) Part size, in bytes, to use when
* doing a multipart upload. This must between 5 MB and 5 GB, inclusive.
* - state: (Aws\Multipart\UploadState) An object that represents the state
* of the multipart upload and that is used to resume a previous upload.
* When this option is provided, the `bucket`, `key`, and `part_size`
* options are ignored.
*
* @param S3Client $client Client used for the upload.
* @param mixed $source Source of the data to upload.
* @param array $config Configuration used to perform the upload.
*/
public function __construct(S3Client $client, $source, array $config = [])
{
parent::__construct($client, $source, array_change_key_case($config) + [
'bucket' => null,
'key' => null,
]);
}
protected function loadUploadWorkflowInfo()
{
return [
'command' => [
'initiate' => 'CreateMultipartUpload',
'upload' => 'UploadPart',
'complete' => 'CompleteMultipartUpload',
],
'id' => [
'bucket' => 'Bucket',
'key' => 'Key',
'upload_id' => 'UploadId',
],
'part_num' => 'PartNumber',
];
}
protected function createPart($seekable, $number)
{
// Initialize the array of part data that will be returned.
$data = ['PartNumber' => $number];
// Read from the source to create the body stream.
if ($seekable) {
// Case 1: Source is seekable, use lazy stream to defer work.
$body = $this->limitPartStream(
new Psr7\LazyOpenStream($this->source->getMetadata('uri'), 'r')
);
} else {
// Case 2: Stream is not seekable; must store in temp stream.
$source = $this->limitPartStream($this->source);
$source = $this->decorateWithHashes($source, $data);
$body = Psr7\stream_for();
Psr7\copy_to_stream($source, $body);
$data['ContentLength'] = $body->getSize();
}
// Do not create a part if the body size is zero.
if ($body->getSize() === 0) {
return false;
}
$body->seek(0);
$data['Body'] = $body;
return $data;
}
protected function extractETag(ResultInterface $result)
{
return $result['ETag'];
}
protected function getSourceMimeType()
{
if ($uri = $this->source->getMetadata('uri')) {
return Psr7\mimetype_from_filename($uri)
?: 'application/octet-stream';
}
}
protected function getSourceSize()
{
return $this->source->getSize();
}
/**
* Decorates a stream with a sha256 linear hashing stream.
*
* @param Stream $stream Stream to decorate.
* @param array $data Part data to augment with the hash result.
*
* @return Stream
*/
private function decorateWithHashes(Stream $stream, array &$data)
{
// Decorate source with a hashing stream
$hash = new PhpHash('sha256');
return new HashingStream($stream, $hash, function ($result) use (&$data) {
$data['ContentSHA256'] = bin2hex($result);
});
}
}
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