multipartstream.php

См. документацию.

<?php
 
namespace Bitrix\Main\Web\Http;
 
use Bitrix\Main\ArgumentException;
 
class MultipartStream extends FormStream
{
    protected const BUF_LEN = 524288;
 
    protected $boundary;
 
    public function getBoundary(): string
    {
        if ($this->boundary === null)
        {
            $this->boundary = 'BXC' . uniqid('', true);
        }
 
        return $this->boundary;
    }
 
    protected function build(array $data)
    {
        $boundary = $this->getBoundary();
 
        foreach ($data as $k => $v)
        {
            $this->write('--' . $boundary . "\r\n");
 
            if ((is_resource($v) && get_resource_type($v) === 'stream') || is_array($v))
            {
                $filename = $v['filename'] ?? $k;
                $contentType = $v['contentType'] ?? 'application/octet-stream';
 
                $this->write('Content-Disposition: form-data; name="' . $k . '"; filename="' . $filename . '"' . "\r\n");
                $this->write('Content-Type: ' . $contentType . "\r\n\r\n");
 
                if (is_array($v))
                {
                    if (isset($v['resource']) && is_resource($v['resource']) && get_resource_type($v['resource']) === 'stream')
                    {
                        fseek($v['resource'], 0);
                        while (!feof($v['resource']))
                        {
                            $this->write(stream_get_contents($v['resource'], static::BUF_LEN));
                        }
                    }
                    else
                    {
                        if (isset($v['content']))
                        {
                            $this->write($v['content']);
                        }
                        else
                        {
                            throw new ArgumentException("File `{$k}` not found for multipart upload.", 'data');
                        }
                    }
 
                }
                else
                {
                    fseek($v, 0);
                    while (!feof($v))
                    {
                        $this->write(stream_get_contents($v, static::BUF_LEN));
                    }
                }
            }
            else
            {
                $this->write('Content-Disposition: form-data; name="' . $k . '"' . "\r\n\r\n");
                $this->write($v);
            }
 
            $this->write("\r\n");
        }
 
        $this->write('--' . $boundary . "--\r\n");
    }
}