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<?php |
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/** |
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* This file is part of the ZBateson\MailMimeParser project. |
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* |
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* @license http://opensource.org/licenses/bsd-license.php BSD |
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*/ |
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namespace ZBateson\MailMimeParser\Stream; |
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use ArrayIterator; |
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use GuzzleHttp\Psr7; |
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use Psr\Http\Message\StreamInterface; |
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use SplObserver; |
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use SplSubject; |
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use Traversable; |
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use ZBateson\MailMimeParser\Header\HeaderConsts; |
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use ZBateson\MailMimeParser\Message\IMessagePart; |
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use ZBateson\MailMimeParser\Message\IMimePart; |
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/** |
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* Psr7 stream decorator implementation providing a readable stream for a part's |
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* headers. |
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* |
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* HeaderStream is only used by a MimePart parent. It can accept any |
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* MessagePart - for non-MimeParts, only type headers are generated based on |
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* available information. |
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* |
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* @author Zaahid Bateson |
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*/ |
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class HeaderStream extends MessagePartStreamDecorator implements SplObserver, StreamInterface |
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{ |
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/** |
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* @var IMessagePart the part to read from. |
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*/ |
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protected IMessagePart $part; |
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public function __construct(IMessagePart $part) |
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{ |
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parent::__construct($part); |
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$part->attach($this); |
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// unsetting the property forces the first access to go through |
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// __get(). |
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unset($this->stream); |
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} |
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public function __destruct() |
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{ |
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$this->part->detach($this); |
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} |
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public function update(SplSubject $subject) : void |
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{ |
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if ($this->stream !== null) { |
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$this->stream = $this->createStream(); |
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} |
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} |
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/** |
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* Returns a header array for the current part. |
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* |
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* If the part is not a MimePart, Content-Type, Content-Disposition and |
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* Content-Transfer-Encoding headers are generated manually. |
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*/ |
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private function getPartHeadersIterator() : Traversable |
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{ |
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if ($this->part instanceof IMimePart) { |
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return $this->part->getRawHeaderIterator(); |
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} elseif ($this->part->getParent() !== null && $this->part->getParent()->isMime()) { |
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return new ArrayIterator([ |
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[HeaderConsts::CONTENT_TYPE, $this->part->getContentType()], |
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[HeaderConsts::CONTENT_DISPOSITION, $this->part->getContentDisposition()], |
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[HeaderConsts::CONTENT_TRANSFER_ENCODING, $this->part->getContentTransferEncoding()] |
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]); |
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} |
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return new ArrayIterator(); |
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} |
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/** |
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* Writes out headers for $this->part and follows them with an empty line. |
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*/ |
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public function writePartHeadersTo(StreamInterface $stream) : static |
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{ |
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foreach ($this->getPartHeadersIterator() as $header) { |
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$stream->write("{$header[0]}: {$header[1]}\r\n"); |
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} |
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$stream->write("\r\n"); |
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return $this; |
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} |
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/** |
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* Creates the underlying stream lazily when required. |
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*/ |
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protected function createStream() : StreamInterface |
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{ |
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$stream = Psr7\Utils::streamFor(); |
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$this->writePartHeadersTo($stream); |
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$stream->rewind(); |
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return $stream; |
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} |
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} |
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zbateson /
mail-mime-parser
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