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?? AppendStream.php(5.81 KB)
?? BufferStream.php(3.14 KB)
?? CachingStream.php(4.49 KB)
?? DroppingStream.php(1.17 KB)
?? Exception
?? FnStream.php(4.21 KB)
?? Header.php(3.85 KB)
?? HttpFactory.php(3 KB)
?? InflateStream.php(1.38 KB)
?? LazyOpenStream.php(1.06 KB)
?? LimitStream.php(4.18 KB)
?? Message.php(8.14 KB)
?? MessageTrait.php(7.61 KB)
?? MimeType.php(55.82 KB)
?? MultipartStream.php(6.85 KB)
?? NoSeekStream.php(524 B)
?? PumpStream.php(4.49 KB)
?? Query.php(3.95 KB)
?? Request.php(3.81 KB)
?? Response.php(4.79 KB)
?? Rfc7230.php(661 B)
?? ServerRequest.php(9.33 KB)
?? Stream.php(7.21 KB)
?? StreamDecoratorTrait.php(3.24 KB)
?? StreamWrapper.php(4.53 KB)
?? UploadedFile.php(4.98 KB)
?? Uri.php(21.5 KB)
?? UriComparator.php(1.12 KB)
?? UriNormalizer.php(8.26 KB)
?? UriResolver.php(8.38 KB)
?? Utils.php(15.57 KB)

Editing: MultipartStream.php

<?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 any
     *                         value accepted by Utils::streamFor() (scalar,
     *                         null, resource, StreamInterface, Iterator, or
     *                         callable), or an array for nested expansion.
     *                         Optional keys include "headers" (associative
     *                         array of custom headers) and "filename" (string
     *                         to send as the filename in the part).
     *                         When "contents" is an array, it is recursively
     *                         expanded into multiple fields using bracket notation
     *                         (e.g., name[0][key]). Empty arrays produce no fields.
     *                         The "filename" and "headers" options cannot be used
     *                         with array contents.
     * @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 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");
            }
        }

if (!is_string($element['name']) && !is_int($element['name'])) {
            throw new \InvalidArgumentException("The 'name' key must be a string or integer");
        }

if (is_array($element['contents'])) {
            if (array_key_exists('filename', $element) || array_key_exists('headers', $element)) {
                throw new \InvalidArgumentException(
                    "The 'filename' and 'headers' options cannot be used when 'contents' is an array"
                );
            }

$this->addNestedElements($stream, $element['contents'], (string) $element['name']);

return;
        }

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

/**
     * Recursively expand array contents into multiple form fields.
     *
     * @param array<array-key, mixed> $contents
     */
    private function addNestedElements(AppendStream $stream, array $contents, string $root): void
    {
        foreach ($contents as $key => $value) {
            $fieldName = $root === '' ? sprintf('[%s]', (string) $key) : sprintf('%s[%s]', $root, (string) $key);

if (is_array($value)) {
                $this->addNestedElements($stream, $value, $fieldName);
            } else {
                $this->addElement($stream, ['name' => $fieldName, 'contents' => $value]);
            }
        }
    }

/**
     * @param string[] $headers
     *
     * @return array{0: StreamInterface, 1: string[]}
     */
    private function createElement(string $name, StreamInterface $stream, ?string $filename, array $headers): array
    {
        // Set a default content-disposition header if one was no provided
        $disposition = self::getHeader($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
        $length = self::getHeader($headers, 'content-length');
        if (!$length) {
            if ($length = $stream->getSize()) {
                $headers['Content-Length'] = (string) $length;
            }
        }

// Set a default Content-Type if one was not supplied
        $type = self::getHeader($headers, 'content-type');
        if (!$type && ($filename === '0' || $filename)) {
            $headers['Content-Type'] = MimeType::fromFilename($filename) ?? 'application/octet-stream';
        }

return [$stream, $headers];
    }

/**
     * @param string[] $headers
     */
    private static function getHeader(array $headers, string $key): ?string
    {
        $lowercaseHeader = strtolower($key);
        foreach ($headers as $k => $v) {
            if (strtolower((string) $k) === $lowercaseHeader) {
                return $v;
            }
        }

return null;
    }
}

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Editing: MultipartStream.php

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