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<?php |
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namespace Dudlewebs\WPMCS\s3\Aws; |
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|
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use Dudlewebs\WPMCS\s3\GuzzleHttp\Psr7\StreamDecoratorTrait; |
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use Dudlewebs\WPMCS\s3\Psr\Http\Message\StreamInterface; |
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/** |
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* Stream decorator that calculates a rolling hash of the stream as it is read. |
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*/ |
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class HashingStream implements StreamInterface |
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{ |
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use StreamDecoratorTrait; |
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/** @var StreamInterface */ |
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private $stream; |
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/** @var HashInterface */ |
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private $hash; |
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/** @var callable|null */ |
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private $callback; |
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/** |
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* @param StreamInterface $stream Stream that is being read. |
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* @param HashInterface $hash Hash used to calculate checksum. |
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* @param callable $onComplete Optional function invoked when the |
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* hash calculation is completed. |
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*/ |
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public function __construct(StreamInterface $stream, HashInterface $hash, ?callable $onComplete = null) |
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{ |
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$this->stream = $stream; |
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$this->hash = $hash; |
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$this->callback = $onComplete; |
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} |
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public function read($length) : string |
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{ |
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$data = $this->stream->read($length); |
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$this->hash->update($data); |
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if ($this->eof()) { |
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$result = $this->hash->complete(); |
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if ($this->callback) { |
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\call_user_func($this->callback, $result); |
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} |
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} |
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return $data; |
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} |
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public function seek($offset, $whence = \SEEK_SET) : void |
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{ |
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// Seeking arbitrarily is not supported. |
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if ($offset !== 0) { |
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return; |
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} |
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$this->hash->reset(); |
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$this->stream->seek($offset); |
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} |
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} |
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