File indexing completed on 2024-12-29 05:27:23

 <?php
 namespace GuzzleHttp\Psr7;
 
 use Psr\Http\Message\StreamInterface;
 
 /**
  * Stream that when read returns bytes for a streaming multipart or
  * multipart/form-data stream.
  */
 class MultipartStream implements StreamInterface
 {
     use StreamDecoratorTrait;
 
     private $boundary;
 
     /**
      * @param array  $elements Array of associative arrays, each containing a
      *                         required "name" key mapping to the form field,
      *                         name, a required "contents" key mapping to a
      *                         StreamInterface/resource/string, an optional
      *                         "headers" associative array of custom headers,
      *                         and an optional "filename" key mapping to a
      *                         string to send as the filename in the part.
      * @param string $boundary You can optionally provide a specific boundary
      *
      * @throws \InvalidArgumentException
      */
     public function __construct(array $elements = [], $boundary = null)
     {
         $this->boundary = $boundary ?: sha1(uniqid('', true));
         $this->stream = $this->createStream($elements);
     }
 
     /**
      * Get the boundary
      *
      * @return string
      */
     public function getBoundary()
     {
         return $this->boundary;
     }
 
     public function isWritable()
     {
         return false;
     }
 
     /**
      * Get the headers needed before transferring the content of a POST file
      */
     private function getHeaders(array $headers)
     {
         $str = '';
         foreach ($headers as $key => $value) {
             $str .= "{$key}: {$value}\r\n";
         }
 
         return "--{$this->boundary}\r\n" . trim($str) . "\r\n\r\n";
     }
 
     /**
      * Create the aggregate stream that will be used to upload the POST data
      */
     protected function createStream(array $elements)
     {
         $stream = new AppendStream();
 
         foreach ($elements as $element) {
             $this->addElement($stream, $element);
         }
 
         // Add the trailing boundary with CRLF
         $stream->addStream(stream_for("--{$this->boundary}--\r\n"));
 
         return $stream;
     }
 
     private function addElement(AppendStream $stream, array $element)
     {
         foreach (['contents', 'name'] as $key) {
             if (!array_key_exists($key, $element)) {
                 throw new \InvalidArgumentException("A '{$key}' key is required");
             }
         }
 
         $element['contents'] = stream_for($element['contents']);
 
         if (empty($element['filename'])) {
             $uri = $element['contents']->getMetadata('uri');
             if (substr($uri, 0, 6) !== 'php://') {
                 $element['filename'] = $uri;
             }
         }
 
         list($body, $headers) = $this->createElement(
             $element['name'],
             $element['contents'],
             isset($element['filename']) ? $element['filename'] : null,
             isset($element['headers']) ? $element['headers'] : []
         );
 
         $stream->addStream(stream_for($this->getHeaders($headers)));
         $stream->addStream($body);
         $stream->addStream(stream_for("\r\n"));
     }
 
     /**
      * @return array
      */
     private function createElement($name, StreamInterface $stream, $filename, array $headers)
     {
         // Set a default content-disposition header if one was no provided
         $disposition = $this->getHeader($headers, 'content-disposition');
         if (!$disposition) {
             $headers['Content-Disposition'] = ($filename === '0' || $filename)
                 ? sprintf('form-data; name="%s"; filename="%s"',
                     $name,
                     basename($filename))
                 : "form-data; name=\"{$name}\"";
         }
 
         // Set a default content-length header if one was no provided
         $length = $this->getHeader($headers, 'content-length');
         if (!$length) {
             if ($length = $stream->getSize()) {
                 $headers['Content-Length'] = (string) $length;
             }
         }
 
         // Set a default Content-Type if one was not supplied
         $type = $this->getHeader($headers, 'content-type');
         if (!$type && ($filename === '0' || $filename)) {
             if ($type = mimetype_from_filename($filename)) {
                 $headers['Content-Type'] = $type;
             }
         }
 
         return [$stream, $headers];
     }
 
     private function getHeader(array $headers, $key)
     {
         $lowercaseHeader = strtolower($key);
         foreach ($headers as $k => $v) {
             if (strtolower($k) === $lowercaseHeader) {
                 return $v;
             }
         }
 
         return null;
     }
 }