HttpContentProvider.php

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<?php
namespace Magento\ReleaseNotification\Model\ContentProvider\Http;

use Magento\ReleaseNotification\Model\ContentProviderInterface;
use Magento\Setup\Module\I18n\Locale;
use Psr\Log\LoggerInterface;
use Magento\Framework\HTTP\ClientInterface;

class HttpContentProvider implements ContentProviderInterface
{
    private $httpClient;

    private $logger;

    private $urlBuilder;

    public function __construct(
        ClientInterface $httpClient,
        UrlBuilder $urlBuilder,
        LoggerInterface $logger
    ) {
        $this->httpClient = $httpClient;
        $this->urlBuilder = $urlBuilder;
        $this->logger = $logger;
    }

    public function getContent($version, $edition, $locale)
    {
        $result = false;

        try {
            $result = $this->retrieveContent($version, $edition, $locale);
            if (!$result) {
                $result = $this->retrieveContent($version, $edition, Locale::DEFAULT_SYSTEM_LOCALE);
                if (!$result) {
                    $result = $this->retrieveContent($version, '', 'default');
                }
            }
        } catch (\Exception $e) {
            $this->logger->warning(
                sprintf(
                    'Failed to retrieve the release notification content. The response is: %s',
                    empty($result) ? 'Response body is empty.' : $result
                )
            );
        }

        return $result;
    }

    private function retrieveContent($version, $edition, $locale)
    {
        $url = $this->urlBuilder->getUrl($version, $edition, $locale);
        return empty($url) ? false : $this->getResponse($url);
    }

    private function getResponse($url)
    {
        $this->httpClient->get($url);
        $responseBody = $this->httpClient->getBody();

        if ($this->httpClient->getStatus() === 200 && !empty($responseBody)) {
            return $responseBody;
        }

        return false;
    }
}