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Edit File: unitecreator_import_changelog.class.php

<?php
/**
 * @package Unlimited Elements
 * @author unlimited-elements.com
 * @copyright (C) 2021 Unlimited Elements, All Rights Reserved.
 * @license GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
 * */
if ( ! defined( 'ABSPATH' ) ) exit;

class UniteCreatorImportExportChangelog{

/**
	 *  Export Changelog.
	 *
	 * @return void
	 */
	public function exportChangelog($typeExport) {
		
		global $wpdb;

$changelogTable = UniteFunctionsWPUC::prefixDBTable(GlobalsUC::TABLE_CHANGELOG_NAME);
		$addonsTable = GlobalsUc::$table_addons;

$query = "
            SELECT changelog.type, changelog.text, changelog.plugin_version, changelog.created_at, addons.name 
                AS addon_name  
              FROM $changelogTable 
                AS changelog
         LEFT JOIN $addonsTable 
                AS addons
                ON changelog.addon_id = addons.id
        ";

// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
		$items = $wpdb->get_results($query);

$arrayItems = array();

foreach($items as $item){
			$arrayItems[] = $item;
		}

$filename = "changelog-" . current_time("mysql") . ".json";
		$content  = json_encode($arrayItems);

if($typeExport == 'export-file')
			UniteFunctionsUC::downloadJson($filename, $content);

if($typeExport == 'export-json')
			uelm_echo($content);
		
	}

/**
	 *  Import Changelog.
	 *
	 * @return void
	 */
	public function importChangelog() {
		$nonce = UniteFunctionsUC::getPostGetVariable("nonce", "", UniteFunctionsUC::SANITIZE_NOTHING);
		$urlViewImport = HelperUC::getViewUrl(GlobalsUnlimitedElements::VIEW_CHANGELOG_IMPORT);

//check nonce

$hasPermissions = UniteFunctionsWPUC::isCurrentUserHasPermissions();

$isNonceValid = wp_verify_nonce($nonce, 'import_json_changelog_action');

if ($hasPermissions == false || $isNonceValid == false) {

$this->processImportJsonAction_error("Security check failed or insufficient permissions.", "unlimited-elements-for-elementor");

return(false);
		}

//check that data is valid

if (empty($_FILES['json_file']['tmp_name']) || $_FILES['json_file']['type'] !== 'application/json') {

$this->processImportJsonAction_error(__("Invalid file or upload error.", "unlimited-elements-for-elementor"));

return(false);
		}

$jsonData = UniteFunctionsUC::fileGetContents($_FILES['json_file']['tmp_name']);

$decodedData = json_decode($jsonData, true);

if(empty($decodedData))
			$this->processImportJsonAction_error(__("Invalid JSON data found", "unlimited-elements-for-elementor"));

$success = $this->processRecordChangelogAction($decodedData);

if($success == false)
			$this->processImportJsonAction_error(__("Import processing failed", "unlimited-elements-for-elementor"));

//if all ok, show success data

set_transient("uc_changelog_import_success", __("Change Log imported successfully!", "unlimited-elements-for-elementor"), 30);

wp_redirect($urlViewImport);
	}

/**
	 * Process the record changelog json action.
	 *
	 * @return void
	 */

public function processRecordChangelogAction($data){

$isChangelogImportDisabled = HelperProviderUC::isAddonChangelogImportDisabled();
		if($isChangelogImportDisabled){
			echo esc_attr(__( "The import operation disabled in the general settings.", "unlimited-elements-for-elementor" ));
			exit;
		}

global $wpdb;

if(empty($data))
			return(false);

$objAddons = new UniteCreatorAddons();
		$addons = $objAddons->getArrAddonsShort('', array(), GlobalsUC::ADDON_TYPE_ELEMENTOR);

$arrAddonsAssoc = array();

//prepare assoc array of addons

foreach ($addons as $addon) {

$arrAddonsAssoc[$addon["name"]] = array(
				'id' => $addon['id'],
				'title' => $addon['title']
			);

}

$changelogTable = UniteFunctionsWPUC::prefixDBTable(GlobalsUC::TABLE_CHANGELOG_NAME);

//delete the table

$wpdb->query("TRUNCATE TABLE {$changelogTable}");
		
		$adminUserID = get_current_user_id();
		
		foreach ($data as $item) {

$addon = UniteFunctionsUC::getVal($arrAddonsAssoc, $item['addon_name']);

if(empty($addon))
				continue;

$data_to_insert = array(
				'addon_id'       => $addon['id'],
				'user_id'        => $adminUserID,
				'type'           => $item['type'],
				'text'           => $item['text'],
				'plugin_version' => $item['plugin_version'],
				'created_at'     => $item['created_at'],
				'addon_title'    => $addon['title']
			);

$wpdb->insert($changelogTable, $data_to_insert);
		}

return true;
	}

/**
	 * set error message
	 */
	private function processImportJsonAction_error($errorMessage){

$keyError = "uc_changelog_import_error";
		$urlViewImport = HelperUC::getViewUrl(GlobalsUnlimitedElements::VIEW_CHANGELOG_IMPORT);

set_transient($keyError, $errorMessage, 30);
		wp_redirect($urlViewImport);
	}

}