VersionMessage.php

<?php
/**
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 * #############  #############  #############  #############  #####  ######
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 *
 * Adyen Payment Module
 *
 * Copyright (c) 2018 Adyen B.V.
 * This file is open source and available under the MIT license.
 * See the LICENSE file for more info.
 *
 * Author: Adyen <magento@adyen.com>
 */

namespace Adyen\Payment\AdminMessage;

class VersionMessage implements \Magento\Framework\Notification\MessageInterface
{
    protected $_authSession;
    protected $_adyenHelper;
    protected $_inboxFactory;

    public function __construct(
        \Magento\Backend\Model\Auth\Session $authSession,
        \Adyen\Payment\Helper\Data $adyenHelper,
        \Magento\AdminNotification\Model\InboxFactory $inboxFactory
    ) {
        $this->_authSession = $authSession;
        $this->_adyenHelper = $adyenHelper;
        $this->_inboxFactory = $inboxFactory;
    }

    /**
     * Message identity
     */
    const MESSAGE_IDENTITY = 'Adyen Version Control message';

    /**
     * Retrieve unique system message identity
     *
     * @return string
     */
    public function getIdentity()
    {
        return self::MESSAGE_IDENTITY;
    }

    /**
     * Check whether the system message should be shown
     *
     * @return bool
     */
    public function isDisplayed()
    {
        // Only execute the query the first time you access the Admin page
        if ($this->_authSession->isFirstPageAfterLogin()) {
            try {
                $githubContent = $this->getDecodedContentFromGithub();
                $this->setSessionData("AdyenGithubVersion", $githubContent);
                $title = "Adyen extension version " . $githubContent['tag_name'] . " available!";
                $versionData[] = [
                    'severity' => self::SEVERITY_NOTICE,
                    'date_added' => $githubContent['published_at'],
                    'title' => $title,
                    'description' => $githubContent['body'],
                    'url' => $githubContent['html_url'],
                ];

                /*
                 * The parse function checks if the $versionData message exists in the inbox,
                 * otherwise it will create it and add it to the inbox.
                 */
                $this->_inboxFactory->create()->parse(array_reverse($versionData));

                /*
                 * This will compare the currently installed version with the latest available one.
                 * A message will appear after the login if the two are not matching.
                 */
                if ($this->_adyenHelper->getModuleVersion() != $githubContent['tag_name']) {
                    return true;
                }
            } catch (\Exception $e) {
                return false;
            }
        }
        return false;
    }

    /**
     * Retrieve system message text
     *
     * @return \Magento\Framework\Phrase
     */
    public function getText()
    {
        $githubContent = $this->getSessionData("AdyenGithubVersion");
        $message = __("A new Adyen extension version is now available: ");
        $message .= __("<a href= \"" . $githubContent['html_url'] . "\" target='_blank'> " . $githubContent['tag_name'] . "!</a>");
        $message .= __(" You are running the " . $this->_adyenHelper->getModuleVersion() . " version. We advise to update your extension.");
        return __($message);
    }

    /**
     * Retrieve system message severity
     *
     * @return int
     */
    public function getSeverity()
    {
        return self::SEVERITY_MAJOR;
    }

    public function getDecodedContentFromGithub()
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, 'https://api.github.com/repos/adyen/adyen-magento2/releases/latest');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 1);
        curl_setopt($ch, CURLOPT_USERAGENT, 'magento');
        $content = curl_exec($ch);
        curl_close($ch);
        $json = json_decode($content, true);
        return $json;
    }

    /**
     * Set the current value for the backend session
     */
    public function setSessionData($key, $value)
    {
        return $this->_authSession->setData($key, $value);
    }

    /**
     * Retrieve the session value
     */
    public function getSessionData($key, $remove = false)
    {
        return $this->_authSession->getData($key, $remove);
    }
}