mirror of
https://github.com/itflow-org/itflow
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102 lines
2.9 KiB
PHP
102 lines
2.9 KiB
PHP
<?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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