<?php

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declare (strict_types=1);

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namespace YoastSEO_Vendor\GuzzleHttp\Psr7;

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use YoastSEO_Vendor\Psr\Http\Message\StreamInterface;

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/**

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

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* multipart/form-data stream.

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*/

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final class MultipartStream implements \YoastSEO_Vendor\Psr\Http\Message\StreamInterface

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{

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use StreamDecoratorTrait;

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/** @var string */

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private $boundary;

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/** @var StreamInterface */

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private $stream;

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/**

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* @param array $elements Array of associative arrays, each containing a

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* required "name" key mapping to the form field,

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* name, a required "contents" key mapping to a

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* StreamInterface/resource/string, an optional

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* "headers" associative array of custom headers,

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* and an optional "filename" key mapping to a

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* string to send as the filename in the part.

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* @param string $boundary You can optionally provide a specific boundary

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*

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* @throws \InvalidArgumentException

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*/

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public function __construct(array $elements = [], string $boundary = null)

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{

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

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

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}

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public function getBoundary() : string

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{

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return $this->boundary;

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}

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public function isWritable() : bool

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{

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return \false;

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}

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/**

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

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*

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* @param string[] $headers

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*/

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private function getHeaders(array $headers) : string

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{

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$str = '';

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foreach ($headers as $key => $value) {

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$str .= "{$key}: {$value}\r\n";

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}

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return "--{$this->boundary}\r\n" . \trim($str) . "\r\n\r\n";

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}

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/**

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* Create the aggregate stream that will be used to upload the POST data

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*/

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protected function createStream(array $elements = []) : \YoastSEO_Vendor\Psr\Http\Message\StreamInterface

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{

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$stream = new \YoastSEO_Vendor\GuzzleHttp\Psr7\AppendStream();

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foreach ($elements as $element) {

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if (!\is_array($element)) {

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

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}

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$this->addElement($stream, $element);

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}

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// Add the trailing boundary with CRLF

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$stream->addStream(\YoastSEO_Vendor\GuzzleHttp\Psr7\Utils::streamFor("--{$this->boundary}--\r\n"));

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return $stream;

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}

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private function addElement(\YoastSEO_Vendor\GuzzleHttp\Psr7\AppendStream $stream, array $element) : void

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{

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foreach (['contents', 'name'] as $key) {

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if (!\array_key_exists($key, $element)) {

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throw new \InvalidArgumentException("A '{$key}' key is required");

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}

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}

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$element['contents'] = \YoastSEO_Vendor\GuzzleHttp\Psr7\Utils::streamFor($element['contents']);

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if (empty($element['filename'])) {

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$uri = $element['contents']->getMetadata('uri');

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

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$element['filename'] = $uri;

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}

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}

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[$body, $headers] = $this->createElement($element['name'], $element['contents'], $element['filename'] ?? null, $element['headers'] ?? []);

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$stream->addStream(\YoastSEO_Vendor\GuzzleHttp\Psr7\Utils::streamFor($this->getHeaders($headers)));

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$stream->addStream($body);

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$stream->addStream(\YoastSEO_Vendor\GuzzleHttp\Psr7\Utils::streamFor("\r\n"));

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}

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/**

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* @param string[] $headers

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*

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* @return array{0: StreamInterface, 1: string[]}

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*/

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private function createElement(string $name, \YoastSEO_Vendor\Psr\Http\Message\StreamInterface $stream, ?string $filename, array $headers) : array

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{

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// Set a default content-disposition header if one was no provided

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$disposition = self::getHeader($headers, 'content-disposition');

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if (!$disposition) {

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$headers['Content-Disposition'] = $filename === '0' || $filename ? \sprintf('form-data; name="%s"; filename="%s"', $name, \basename($filename)) : "form-data; name=\"{$name}\"";

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}

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// Set a default content-length header if one was no provided

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$length = self::getHeader($headers, 'content-length');

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if (!$length) {

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if ($length = $stream->getSize()) {

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$headers['Content-Length'] = (string) $length;

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}

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}

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// Set a default Content-Type if one was not supplied

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$type = self::getHeader($headers, 'content-type');

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if (!$type && ($filename === '0' || $filename)) {

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$headers['Content-Type'] = \YoastSEO_Vendor\GuzzleHttp\Psr7\MimeType::fromFilename($filename) ?? 'application/octet-stream';

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}

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return [$stream, $headers];

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}

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/**

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* @param string[] $headers

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*/

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private static function getHeader(array $headers, string $key) : ?string

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{

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$lowercaseHeader = \strtolower($key);

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

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

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return $v;

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}

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}

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return null;

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}

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}

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