Content::uploadAction

public function uploadAction($filename, $token = null)
{
	if ($_SERVER['CONTENT_LENGTH'] >
		min(CUtil::unformat(ini_get('upload_max_filesize')), CUtil::unformat(ini_get('post_max_size'))))
	{
		$this->errorCollection[] = new Error(
			'The content length is too big to process request.', self::ERROR_COULD_TOO_BIG_REQUEST
		);

		return;
	}

	list($startRange, $endRange, $fileSize) = $this->getContentRange();

	if (($startRange === null || $startRange === 0) && $token)
	{
		$this->errorCollection[] = new Error('You have to send Content-Range header to continue upload');

		return;
	}

	$tmpFileArray = $this->getTmpFileArrayByInput();

	$tmpFileManager = new Bitrix24DiskUploadFileManager();
	$tmpFileManager
		->setTmpFileClass(DiskDocumentCloudImportTmpFile::class)
		->setToken($token)
		->setUser($this->getCurrentUser()->getId())
		->setFileSize($fileSize)
		->setContentRange([$startRange, $endRange])
	;

	if (!$tmpFileManager->upload($filename, $tmpFileArray))
	{
		$this->errorCollection->add($tmpFileManager->getErrors());

		return;
	}

	return [
		'token' => $tmpFileManager->getToken(),
	];
}