diskfile.php

См. документацию.

<?php
namespace Bitrix\Landing\Controller;
 
use Bitrix\Landing\Block;
use Bitrix\Landing\Connector;
use Bitrix\Landing\Site\Type;
use Bitrix\Main\Engine\Controller;
use Bitrix\Main\Engine\Response\BFile;
use Bitrix\Main\Error;
use Bitrix\Main\UI\Viewer;
 
class DiskFile extends Controller
{
    private const FILE_DOWNLOAD_URL = '/bitrix/services/main/ajax.php?' .
                                        'action=landing.api.diskFile.download&' .
                                        'fileId=#fileId#&blockId=#blockId#&scope=#scope#';
 
    public function getDefaultPreFilters(): array
    {
        return [];
    }

    public static function getDownloadLink(string $scope, int $blockId, ?int $fileId = null): string
    {
        return str_replace(
            ['#scope#', '#blockId#', '#fileId#'],
            [$scope, $blockId, $fileId ?: '#fileId#'],
            self::FILE_DOWNLOAD_URL . '&ver=' . time()
        );
    }

    private function blockContainsFile(string $scope, int $blockId, int $fileId): bool
    {
        if (Type::isPublicScope($scope))
        {
            return false;
        }
 
        Type::setScope($scope);
        $needed = Connector\Disk::FILE_PREFIX_HREF . $fileId;
 
        return Block::isContains($blockId, $needed);
    }

    private function landingContainsFile(string $scope, int $landingId, int $fileId): bool
    {
        if (Type::isPublicScope($scope))
        {
            return false;
        }
 
        Type::setScope($scope);
        $needed = Connector\Disk::FILE_PREFIX_HREF . $fileId;
 
        return Block::isContains($landingId, $needed, true);
    }

    public function downloadAction(string $scope, int $blockId, int $fileId): ?BFile
    {
        if ($this->blockContainsFile($scope, $blockId, $fileId))
        {
            $fileInfo = \Bitrix\Landing\Connector\Disk::getFileInfo($fileId, false);
            if ($fileInfo)
            {
                return new BFile(\CFile::getFileArray($fileInfo['ID']), $fileInfo['NAME']);
            }
        }
 
        $this->addError(new Error('Access denied.'));
        return null;
    }

    public function viewAction(string $scope, int $blockId, int $fileId): ?array
    {
        if ($this->blockContainsFile($scope, $blockId, $fileId))
        {
            $fileInfo = \Bitrix\Landing\Connector\Disk::getFileInfo($fileId, false);
            if ($fileInfo)
            {
                $urlToDownload = $this->getDownloadLink($scope, $blockId, $fileId);
                $attributes = Viewer\ItemAttributes::tryBuildByFileId($fileInfo['ID'], $urlToDownload);
                $attributes->setTitle($fileInfo['NAME']);
                return $attributes->getAttributes();
            }
        }
 
        $this->addError(new Error('Access denied.'));
        return null;
    }

    public function infoAction(int $fileId, string $scope, int $landingId): ?array
    {
        if ($this->landingContainsFile($scope, $landingId, $fileId))
        {
            return \Bitrix\Landing\Connector\Disk::getFileInfo($fileId, false);
        }
 
        return null;
    }
}