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Edit File: Updater.php

<?php // phpcs:ignore SlevomatCodingStandard.TypeHints.DeclareStrictTypes.DeclareStrictTypesMissing

namespace MailPoet\Config;

if (!defined('ABSPATH')) exit;

use MailPoet\Config\Env;
use MailPoet\Services\Bridge;
use MailPoet\Services\Release\API;
use MailPoet\Settings\SettingsController;
use MailPoet\WP\Functions as WPFunctions;

class Updater {
  private $plugin;
  private $slug;
  private $version;
  public $currentFreeVersion;

/** @var SettingsController */
  private $settings;

public function __construct(
    $pluginName,
    $slug,
    $version
  ) {
    $this->plugin = WPFunctions::get()->pluginBasename($pluginName);
    $this->slug = $slug;
    $this->version = $version;
    $this->settings = SettingsController::getInstance();
    $this->currentFreeVersion = MAILPOET_VERSION;
  }

public function init() {
    WPFunctions::get()->addFilter('pre_set_site_transient_update_plugins', [$this, 'checkForUpdate']);
  }

public function checkForUpdate($updateTransient) {
    if (!$updateTransient instanceof \stdClass) {
      $updateTransient = new \stdClass;
    }

$latestVersion = $this->getLatestVersion();

if (!isset($latestVersion->new_version)) { // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
      return $updateTransient; // no latest version found.
    }

if (property_exists($updateTransient, 'response') && isset($updateTransient->response[$this->plugin])) {
      unset($updateTransient->response[$this->plugin]); // remove the cached version from the transient.
    }

$latestFreeVersion = null;
    if (property_exists($updateTransient, 'response') && isset($updateTransient->response[Env::$pluginPath]->new_version)) {
      $latestFreeVersion = $updateTransient->response[Env::$pluginPath]->new_version;
    }

if (!$this->shouldShowUpdateNotice($latestVersion->new_version, $latestFreeVersion)) { // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
      return $updateTransient; // skip update notice.
    }

if (version_compare((string)$this->version, $latestVersion->new_version, '<')) { // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
      $updateTransient->response[$this->plugin] = $latestVersion;
    } else {
      $updateTransient->no_update[$this->plugin] = $latestVersion; // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
    }
    $updateTransient->last_checked = time(); // phpcs:ignore Squiz.NamingConventions.ValidVariableName.MemberNotCamelCaps
    $updateTransient->checked[$this->plugin] = $this->version;

return $updateTransient;
  }

public function getLatestVersion() {
    $key = $this->settings->get(Bridge::PREMIUM_KEY_SETTING_NAME);
    $api = new API($key);
    $data = $api->getPluginInformation($this->slug . '/latest');
    return $data;
  }

public function isVersionCompatible($premiumVersion, $freeVersion): bool {
    if (empty($premiumVersion) || empty($freeVersion)) {
        return false;
    }

// Extract major.minor from premium version (e.g., "5.17.0" -> "5.17")
    $premiumParts = explode('.', $premiumVersion);
    $requiredMainVersion = isset($premiumParts[0], $premiumParts[1])
        ? $premiumParts[0] . '.' . $premiumParts[1]
        : $premiumVersion;

// Extract major.minor from free version (e.g., "5.17.5" -> "5.17")
    $freeParts = explode('.', $freeVersion);
    $currentMainVersion = isset($freeParts[0], $freeParts[1])
        ? $freeParts[0] . '.' . $freeParts[1]
        : $freeVersion;

// Check compatibility: free version must be >= required version
    return version_compare($currentMainVersion, $requiredMainVersion, '>=');
  }

public function shouldShowUpdateNotice($premiumLatestVersion, $latestFreeVersion = null): bool {
    // first check if the free version in the update transient is compatible with the premium latest version
    if (!empty($latestFreeVersion) && $this->isVersionCompatible($premiumLatestVersion, $latestFreeVersion)) {
      return true;
    }

// then check if the current free version is compatible with the premium latest version
    return $this->isVersionCompatible($premiumLatestVersion, $this->currentFreeVersion);
  }
}

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