LinkProvider.php

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<?php
namespace Magento\Analytics\Model;

use Magento\Analytics\Api\Data\LinkInterfaceFactory;
use Magento\Analytics\Api\LinkProviderInterface;
use Magento\Framework\Exception\NoSuchEntityException;
use Magento\Framework\UrlInterface;
use Magento\Store\Model\StoreManagerInterface;

class LinkProvider implements LinkProviderInterface
{
    private $linkFactory;

    private $fileInfoManager;

    private $storeManager;

    public function __construct(
        LinkInterfaceFactory $linkFactory,
        FileInfoManager $fileInfoManager,
        StoreManagerInterface $storeManager
    ) {
        $this->linkFactory = $linkFactory;
        $this->fileInfoManager = $fileInfoManager;
        $this->storeManager = $storeManager;
    }

    private function getBaseUrl(FileInfo $fileInfo)
    {
        return $this->storeManager->getStore()->getBaseUrl(UrlInterface::URL_TYPE_MEDIA) . $fileInfo->getPath();
    }

    private function isFileReady(FileInfo $fileInfo)
    {
        return $fileInfo->getPath() && $fileInfo->getInitializationVector();
    }

    public function get()
    {
        $fileInfo = $this->fileInfoManager->load();
        if (!$this->isFileReady($fileInfo)) {
            throw new NoSuchEntityException(__('File is not ready yet.'));
        }
        return $this->linkFactory->create(
            [
                'url' => $this->getBaseUrl($fileInfo),
                'initializationVector' => base64_encode($fileInfo->getInitializationVector())
            ]
        );
    }
}