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<?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
       
$stream->addStream(Utils::streamFor("--{$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");
            }
        }

       
$element['contents'] = Utils::streamFor($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'] : []
        );

       
$stream->addStream(Utils::streamFor($this->getHeaders($headers)));
       
$stream->addStream($body);
       
$stream->addStream(Utils::streamFor("\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 (
$type = MimeType::fromFilename($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;
    }
}