Proyectos de Subversion Moodle

<?php

declare(strict_types=1);

namespace GuzzleHttp\Psr7;

use Psr\Http\Message\StreamInterface;

/**

 * Stream that when read returns bytes for a streaming multipart or

 * multipart/form-data stream.

 */

final class MultipartStream implements StreamInterface

{

    use StreamDecoratorTrait;

    /** @var string */

    private $boundary;

    /** @var StreamInterface */

    private $stream;

    /**

     * @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 = [], string $boundary = null)

    {

        $this->boundary = $boundary ?: bin2hex(random_bytes(20));

        $this->stream = $this->createStream($elements);

    }

    public function getBoundary(): string

    {

        return $this->boundary;

    }

    public function isWritable(): bool

    {

        return false;

    }

    /**

     * Get the headers needed before transferring the content of a POST file

     *

     * @param array<string, string> $headers

     */

    private function getHeaders(array $headers): string

    {

        $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 = []): StreamInterface

    {

        $stream = new AppendStream();

        foreach ($elements as $element) {

            if (!is_array($element)) {

                throw new \UnexpectedValueException("An array is expected");

            }

            $this->addElement($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): void

    {

        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 ($uri && \is_string($uri) && \substr($uri, 0, 6) !== 'php://' && \substr($uri, 0, 7) !== 'data://') {

                $element['filename'] = $uri;

            }

        }

        [$body, $headers] = $this->createElement(

            $element['name'],

            $element['contents'],

            $element['filename'] ?? null,

            $element['headers'] ?? []

        );

        $stream->addStream(Utils::streamFor($this->getHeaders($headers)));

        $stream->addStream($body);

        $stream->addStream(Utils::streamFor("\r\n"));

    }

    private function createElement(string $name, StreamInterface $stream, ?string $filename, array $headers): array

    {

        // 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, string $key)

    {

        $lowercaseHeader = strtolower($key);

        foreach ($headers as $k => $v) {

            if (strtolower($k) === $lowercaseHeader) {

                return $v;

            }

        }

        return null;

    }

}