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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 GuzzleHttp\Psr7; |
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use GuzzleHttp\Psr7\AppendStream; |
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use GuzzleHttp\Psr7\StreamDecoratorTrait; |
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use Psr\Http\Message\StreamInterface; |
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use ZBateson\MailMimeParser\MailMimeParser; |
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use ZBateson\MailMimeParser\Message\Part\MessagePart; |
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use ZBateson\MailMimeParser\Message\Part\ParentHeaderPart; |
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use ZBateson\MailMimeParser\Stream\StreamFactory; |
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/** |
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* Provides a readable stream for a MessagePart. |
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* |
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* @author Zaahid Bateson |
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*/ |
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class MessagePartStream implements StreamInterface |
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{ |
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use StreamDecoratorTrait; |
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/** |
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* @var StreamFactory For creating needed stream decorators. |
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*/ |
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protected $streamFactory; |
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/** |
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* @var MessagePart The part to read from. |
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*/ |
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protected $part; |
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/** |
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* Constructor |
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* |
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* @param StreamFactory $sdf |
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* @param MessagePart $part |
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*/ |
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public function __construct(StreamFactory $sdf, MessagePart $part) |
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{ |
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$this->streamFactory = $sdf; |
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$this->part = $part; |
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} |
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/** |
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* Attaches and returns a CharsetStream decorator to the passed $stream. |
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* |
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* If the current attached MessagePart doesn't specify a charset, $stream is |
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* returned as-is. |
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* |
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* @param StreamInterface $stream |
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* @return StreamInterface |
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*/ |
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private function getCharsetDecoratorForStream(StreamInterface $stream) |
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{ |
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$charset = $this->part->getCharset(); |
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if (!empty($charset)) { |
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$stream = $this->streamFactory->newCharsetStream( |
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$stream, |
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$charset, |
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MailMimeParser::DEFAULT_CHARSET |
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); |
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} |
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return $stream; |
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} |
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/** |
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* Attaches and returns a transfer encoding stream decorator to the passed |
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* $stream. |
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* |
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* The attached stream decorator is based on the attached part's returned |
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* value from MessagePart::getContentTransferEncoding, using one of the |
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* following stream decorators as appropriate: |
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* |
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* o QuotedPrintableStream |
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* o Base64Stream |
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* o UUStream |
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* |
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* @param StreamInterface $stream |
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* @return StreamInterface |
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*/ |
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private function getTransferEncodingDecoratorForStream(StreamInterface $stream) |
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{ |
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$encoding = $this->part->getContentTransferEncoding(); |
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$decorator = null; |
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switch ($encoding) { |
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case 'quoted-printable': |
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$decorator = $this->streamFactory->newQuotedPrintableStream($stream); |
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break; |
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case 'base64': |
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$decorator = $this->streamFactory->newBase64Stream( |
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$this->streamFactory->newChunkSplitStream($stream)); |
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break; |
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case 'x-uuencode': |
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$decorator = $this->streamFactory->newUUStream($stream); |
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$decorator->setFilename($this->part->getFilename()); |
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break; |
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default: |
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return $stream; |
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} |
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return $decorator; |
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} |
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/** |
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* Writes out the content portion of the attached mime part to the passed |
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* $stream. |
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* |
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* @param StreamInterface $stream |
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*/ |
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private function writePartContentTo(StreamInterface $stream) |
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{ |
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$contentStream = $this->part->getContentStream(); |
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if ($contentStream !== null) { |
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$copyStream = $this->streamFactory->newNonClosingStream($stream); |
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$es = $this->getTransferEncodingDecoratorForStream($copyStream); |
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$cs = $this->getCharsetDecoratorForStream($es); |
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Psr7\copy_to_stream($contentStream, $cs); |
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$cs->close(); |
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} |
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} |
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/** |
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* Creates an array of streams based on the attached part's mime boundary |
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* and child streams. |
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* |
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* @param ParentHeaderPart $part passed in because $this->part is declared |
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* as MessagePart |
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* @return StreamInterface[] |
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*/ |
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protected function getBoundaryAndChildStreams(ParentHeaderPart $part) |
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{ |
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$boundary = $part->getHeaderParameter('Content-Type', 'boundary'); |
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if ($boundary === null) { |
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return array_map( |
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function ($child) { |
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return $child->getStream(); |
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}, |
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$part->getChildParts() |
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); |
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} |
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$streams = []; |
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foreach ($part->getChildParts() as $i => $child) { |
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if ($i !== 0 || $part->hasContent()) { |
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$streams[] = Psr7\stream_for("\r\n"); |
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} |
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$streams[] = Psr7\stream_for("--$boundary\r\n"); |
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$streams[] = $child->getStream(); |
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} |
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$streams[] = Psr7\stream_for("\r\n--$boundary--\r\n"); |
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return $streams; |
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} |
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/** |
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* Returns an array of Psr7 Streams representing the attached part and it's |
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* direct children. |
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* |
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* @return StreamInterface[] |
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*/ |
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protected function getStreamsArray() |
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{ |
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$content = Psr7\stream_for(); |
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$this->writePartContentTo($content); |
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$content->rewind(); |
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$streams = [ $this->streamFactory->newHeaderStream($this->part), $content ]; |
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/** |
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* @var ParentHeaderPart |
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*/ |
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$part = $this->part; |
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if ($part instanceof ParentHeaderPart && $part->getChildCount()) { |
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$streams = array_merge($streams, $this->getBoundaryAndChildStreams($part)); |
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} |
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return $streams; |
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} |
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/** |
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* Creates the underlying stream lazily when required. |
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* |
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* @return StreamInterface |
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*/ |
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protected function createStream() |
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{ |
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return new AppendStream($this->getStreamsArray()); |
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} |
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} |
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zbateson /
mail-mime-parser
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