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Filename : status.php
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<?php
/* @var $wpdb wpdb */
/* @var $this NewsletterSystemAdmin */
/* @var $controls NewsletterControls */


defined('ABSPATH') || exit;

wp_enqueue_script('tnp-chart');

$newsletter = Newsletter::instance();
$mailer = $newsletter->get_mailer();

if ($controls->is_action('conversion')) {
    $this->logger->info('Maybe convert to utf8mb4');
    require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
    if (function_exists('maybe_convert_table_to_utf8mb4')) {
        $r = maybe_convert_table_to_utf8mb4(NEWSLETTER_EMAILS_TABLE);
        if (!$r) {
            $controls->errors .= 'It was not possible to run the conversion for the table ' . NEWSLETTER_EMAILS_TABLE . ' - ';
            $controls->errors .= $wpdb->last_error . '<br>';
        }
        $r = maybe_convert_table_to_utf8mb4(NEWSLETTER_USERS_TABLE);
        if (!$r) {
            $controls->errors .= 'It was not possible to run the conversion for the table ' . NEWSLETTER_USERS_TABLE . ' - ';
            $controls->errors .= $wpdb->last_error . '<br>';
        }
        $controls->messages .= 'Done.';
    } else {
        $controls->errors = 'Table conversion function not available';
    }
}

if ($controls->is_action('reset_dismissed')) {
    update_option('newsletter_dismissed', [], false);
    $controls->add_message_done();
}

if ($controls->is_action('reset_send_stats')) {
    $this->reset_send_stats();
    $controls->add_message_done();
}

if ($controls->is_action('reset_warnings')) {
    $this->reset_warnings();
    $controls->add_message_done();
}

if ($controls->is_action('reset_news')) {
    update_option('newsletter_news_dismissed', []);
    update_option('newsletter_news', []);
    update_option('newsletter_news_updated', 0);
    $controls->add_message_done();
}

if ($controls->is_action('stats_email_column_upgrade')) {
    $this->query("alter table " . NEWSLETTER_STATS_TABLE . " drop index email_id");
    $this->query("alter table " . NEWSLETTER_STATS_TABLE . " drop index user_id");
    $this->query("alter table `" . NEWSLETTER_STATS_TABLE . "` modify column `email_id` int(11) not null default 0");
    $this->query("create index email_id on " . NEWSLETTER_STATS_TABLE . " (email_id)");
    $this->query("create index user_id on " . NEWSLETTER_STATS_TABLE . " (user_id)");
    $controls->add_message_done();
    update_option('newsletter_stats_email_column_upgraded', true);
}

// Trick to access the private function (!)
class TNP_WPDB extends wpdb {

    public function get_table_charset($table) {
        return parent::get_table_charset($table);
    }
}

$tnp_wpdb = new TNP_WPDB(DB_USER, DB_PASSWORD, DB_NAME, DB_HOST);

function tnp_describe_table($table) {
    global $wpdb;
    $rs = $wpdb->get_results("show full columns from " . esc_sql($wpdb->prefix . $table));
    ?>
    <h4><?php echo esc_html($wpdb->prefix) ?><?php echo esc_html($table) ?></h4>
    <table class="tnp-db-table">
        <thead>
            <tr>
                <th>Field</th>
                <th>Type</th>
                <th>Collation</th>
                <th>Null</th>
                <th>Key</th>
                <th>Default</th>
                <th>Extra</th>
            </tr>
        </thead>
        <tbody>
            <?php foreach ($rs as $r) { ?>
                <tr>
                    <td><?php echo esc_html($r->Field) ?></td>
                    <td><?php echo esc_html($r->Type) ?></td>
                    <td><?php echo esc_html($r->Collation) ?></td>
                    <td><?php echo esc_html($r->Null) ?></td>
                    <td><?php echo esc_html($r->Key) ?></td>
                    <td><?php echo esc_html($r->Default) ?></td>
                    <td><?php echo esc_html($r->Extra) ?></td>
                </tr>
            <?php } ?>
        </tbody>
    </table>
    <?php
}
?>

<style>
<?php include __DIR__ . '/css/system.css' ?>
</style>

<div class="wrap tnp-system tnp-system-status" id="tnp-wrap">

    <?php include NEWSLETTER_ADMIN_HEADER; ?>

    <div id="tnp-heading">

<!--        <h2><?php esc_html_e('System', 'newsletter') ?></h2>-->
        <?php include __DIR__ . '/nav.php' ?>
    </div>

    <div id="tnp-body">

        <?php $controls->show(); ?>

        <form method="post" action="">
            <?php $controls->init(); ?>

            <p>
                <?php $controls->btn('reset_warnings', __('Reset warnings', 'newsletter')) ?>
                <?php if (NEWSLETTER_DEBUG) { ?>
                    <?php $controls->btn('reset_news', __('Reset news', 'newsletter')) ?>
                <?php } ?>
            </p>

            <div class="tnp-tabs">

                <ul>

                    <li><a href="#tabs-general"><?php esc_html_e('General', 'newsletter') ?></a></li>
                    <li><a href="#tabs-filters"><?php esc_html_e('Filters', 'newsletter') ?></a></li>
                    <li><a href="#tabs-plugins"><?php esc_html_e('Plugins', 'newsletter') ?></a></li>
                    <li><a href="#tabs-wordpress">WordPress</a></li>
                    <li><a href="#tabs-database"><?php esc_html_e('Database', 'newsletter') ?></a></li>
                    <li><a href="#tabs-php">PHP</a></li>
                    <li><a href="#tabs-parameters"><?php esc_html_e('Parameters', 'newsletter') ?></a></li>
                </ul>


                <div id="tabs-general">
                    <h3>General checks</h3>
                    <table class="widefat" id="tnp-status-table">

                        <thead>
                            <tr>
                                <th>Parameter</th>
                                <th></th>
                                <th>Note</th>
                            </tr>

                        </thead>

                        <tbody>
                            <tr>
                                <td>
                                    General notices and warnings
                                </td>
                                <td>

                                </td>
                                <td>
                                    <?php $controls->btn('reset_dismissed', 'Restore', ['secondary' => true]) ?>
                                </td>
                            </tr>

                            <tr>
                                <?php
                                $tnp_page_id = $newsletter->get_newsletter_page_id();
                                $page = $newsletter->get_newsletter_page();
                                $condition = 1;
                                if ($tnp_page_id) {
                                    if (!$page || $page->post_status !== 'publish') {
                                        $condition = 0;
                                    }
                                } else {
                                    $condition = 2;
                                }
                                ?>
                                <td>
                                    Public page<br>
                                    <small>The blog page Newsletter uses for messages</small>
                                </td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php if ($condition == 2) { ?>
                                        Newsletter is using a neutral page to show messages, if you want to use a public page, configure it on
                                        <a href="?page=newsletter_main_main">main settings</a>.
                                    <?php } else if ($condition == 0) { ?>
                                        A public page is set but it is no more available or no more published. Review the public page on
                                        <a href="?page=newsletter_main_main">main settings</a>.
                                    <?php } ?>
                                </td>
                            </tr>

                            <tr>
                                <?php
                                $page_id = $newsletter->get_newsletter_page_id();
                                $page = $newsletter->get_newsletter_page();
                                $condition = 1;
                                if ($page_id) {
                                    if (!$page) {
                                        $condition = 0;
                                    } else {
                                        $content = $page->post_content;
                                        if (strpos($content, '[newsletter]') === false && strpos($content, '[newsletter ') === false) {
                                            $condition = 2;
                                        }
                                    }
                                }
                                ?>
                                <td>
                                    Public page content<br>
                                </td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php if ($condition == 2) { ?>
                                        The page seems to not contain the <code>[newsletter]</code>, but sometime it cannot be detected if you use
                                        a visual composer. <a href="post.php?post=<?php echo $page->ID ?>&action=edit" target="_blank">Please, check the page</a>.
                                    <?php } else if ($condition == 0) { ?>
                                        The public page seems to not be available.
                                    <?php } ?>
                                </td>
                            </tr>

                            <?php
                            $method = '';
                            if (function_exists('get_filesystem_method')) {
                                $method = get_filesystem_method(array(), WP_PLUGIN_DIR);
                            }
                            if (empty($method))
                                $condition = 2;
                            else if ($method == 'direct')
                                $condition = 1;
                            else
                                $condition = 0;
                            ?>
                            <tr>
                                <td>Add-ons installable</td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php if ($condition == 2) { ?>
                                        No able to check, just try the add-ons manager one click install
                                    <?php } else if ($condition == 1) { ?>
                                        The add-ons manager can install our add-ons
                                    <?php } else { ?>
                                        The plugins dir could be read-only, you can install add-ons uploading the package from the
                                        plugins panel (or uploading them directly via FTP). This is unusual you should ask te provider
                                        about file and folder permissions.
                                    <?php } ?>
                                </td>

                            </tr>


                            <?php
                            $return_path = $newsletter->options['return_path'];
                            if (!empty($return_path)) {
                                list($return_path_local, $return_path_domain) = explode('@', $return_path);
                            }
                            $sender = $newsletter->get_sender_email();
                            if (!empty($sender)) {
                                list($sender_local, $sender_domain) = explode('@', $sender);
                            }
                            ?>
                            <tr>
                                <td>Return path</td>
                                <td>
                                    <?php if (empty($return_path)) { ?>
                                        <span class="tnp-ok">OK</span>
                                    <?php } else { ?>
                                        <?php if ($sender_domain != $return_path_domain) { ?>
                                            <span class="tnp-maybe">MAYBE</span>
                                        <?php } else { ?>
                                            <span class="tnp-ok">OK</span>
                                        <?php } ?>
                                    <?php } ?>

                                </td>
                                <td>
                                    <?php if (!empty($return_path)) { ?>
                                        Some providers require the return path domain <code><?php echo esc_html($return_path_domain) ?></code> to be identical
                                        to the sender domain <code><?php echo esc_html($sender_domain) ?></code>. See the main settings.
                                    <?php } else { ?>
                                    <?php } ?>
                                </td>

                            </tr>





                            <tr>
                                <?php
                                $condition = NEWSLETTER_EXTENSION_UPDATE ? 1 : 0;
                                ?>
                                <td>Addons update</td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php if ($condition == 0) { ?>
                                        Newsletter Addons update is disabled (probably in your <code>wp-config.php</code> file the constant
                                        <code>NEWSLETTER_EXTENSION_UPDATE</code> is set to <code>true</code>)
                                    <?php } else { ?>
                                        Newsletter Addons can be updated
                                    <?php } ?>
                                </td>

                            </tr>

                            <tr>
                                <?php
                                $res = true;
                                $response = wp_remote_get('http://www.thenewsletterplugin.com/wp-content/extensions.json');
                                $condition = 1;
                                if (is_wp_error($response)) {
                                    $res = false;
                                    $condition = 0;
                                    $message = $response->get_error_message();
                                } else {
                                    if (wp_remote_retrieve_response_code($response) != 200) {
                                        $res = false;
                                        $condition = 0;
                                        $message = wp_remote_retrieve_response_message($response);
                                    }
                                }
                                ?>

                                <td>
                                    Addons version check<br>
                                </td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php if ($condition == 0) { ?>
                                        The blog cannot contact www.thenewsletterplugin.com to check the license or the extension versions.<br>
                                        Error: <?php echo esc_html($message) ?><br>
                                    <?php } else { ?>

                                    <?php } ?>
                                </td>
                            </tr>

                            <?php
                            $ip = gethostbyname($_SERVER['HTTP_HOST']);
                            $name = gethostbyaddr($ip);
                            $res = true;
                            if (strpos($name, '.secureserver.net') !== false) {
                                $res = false;
                                $message = 'If you\'re hosted with GoDaddy, be sure to set their SMTP (relay-hosting.secureserver.net, without username and password) to send emails
                                    on Newsletter SMTP panel.
                                    Remember they limits you to 250 emails per day. Open them a ticket for more details.';
                            }
                            if (strpos($name, '.aruba.it') !== false) {
                                $res = false;
                                $message = 'If you\'re hosted with Aruba consider to use an external SMTP (Sendgrid, Mailjet, Mailgun, Amazon SES, Elasticemail, Sparkpost, ...)
                                    since their mail service is not good. If you have your personal email with them, you can try to use the SMTP of your
                                    pesonal account. Ask the support for the SMTP parameters and usae an SMTP plugin.';
                            }
                            ?>
                            <tr>
                                <td>Your Server</td>
                                <td>
                                    <?php if ($res === false) { ?>
                                        <span class="tnp-maybe">MAYBE</span>
                                    <?php } else { ?>
                                        <span class="tnp-ok">OK</span>
                                    <?php } ?>


                                </td>
                                <td>
                                    <?php if ($res === false) { ?>
                                        <?php echo $message ?>
                                    <?php } else { ?>

                                    <?php } ?>
                                    IP: <?php echo $ip ?><br>
                                    Name: <?php echo $name ?><br>
                                </td>
                            </tr>

                            <?php
                            wp_mkdir_p(NEWSLETTER_LOG_DIR);
                            $condition = is_dir(NEWSLETTER_LOG_DIR) && is_writable(NEWSLETTER_LOG_DIR) ? 1 : 0;
                            if ($condition) {
                                @file_put_contents(NEWSLETTER_LOG_DIR . '/test.txt', "");
                                $condition = is_file(NEWSLETTER_LOG_DIR . '/test.txt') ? 1 : 0;
                                if ($condition) {
                                    @unlink(NEWSLETTER_LOG_DIR . '/test.txt');
                                }
                            }
                            ?>
                            <tr>
                                <td>
                                    Log folder
                                </td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    The log folder is <?php echo esc_html(NEWSLETTER_LOG_DIR) ?><br>
                                    <?php if (!$res) { ?>
                                        Cannot create the folder or it is not writable.
                                    <?php } ?>
                                </td>
                            </tr>
                        </tbody>
                    </table>
                </div>


                <div id="tabs-filters">
                    <p>
                        Filters can be used by 3rd party plugins to change the standard behavior of Newsletters.
                        <a href="https://www.thenewsletterplugin.com/documentation/developers/dev-newsletter-hooks/" target="_blank">Read more</a>.
                    </p>
                    <table class="widefat" id="tnp-status-table">
                        <thead>
                            <tr>
                                <th>Filter</th>
                                <th>Function</th>
                            </tr>
                        </thead>
                        <tbody>

                            <tr>
                                <td><code>newsletter_subscription</code></td>
                                <td>
                                    <?php echo has_filter('newsletter_subscription') ? '' : '-' ?>
                                    <?php $this->echo_hook_functions('newsletter_subscription') ?>
                                </td>
                            </tr>
                            <tr>
                                <td><code>newsletter_message</code></td>
                                <td>
                                    <?php echo has_filter('newsletter_message') ? '' : '-' ?>
                                    <?php echo $this->get_hook_functions('newsletter_message') ?>
                                </td>
                            </tr>
                            <tr>
                                <td><code>newsletter_message_headers</code></td>
                                <td>
                                    <?php echo has_filter('newsletter_message_headers') ? '' : '-' ?>
                                    <?php echo $this->get_hook_functions('newsletter_message_headers') ?>
                                    <br>
                                    Deprecated, use <code>newsletter_message</code>.
                                </td>
                            </tr>
                            <tr>
                                <td><code>newsletter_message_html</code></td>
                                <td>
                                    <?php echo has_filter('newsletter_message_html') ? '' : '-' ?><br>
                                    <?php echo $this->get_hook_functions('newsletter_message_html') ?>
                                    <br>
                                    Deprecated, use <code>newsletter_message</code>.
                                </td>
                            </tr>
                            <tr>
                                <td><code>newsletter_message_text</code></td>
                                <td>
                                    <?php echo has_filter('newsletter_message_text') ? '' : '-' ?><br>
                                    <?php echo $this->get_hook_functions('newsletter_message_text') ?>
                                    <br>
                                    Deprecated, use <code>newsletter_message</code>.
                                </td>
                            </tr>
                            <tr>
                                <td><code>newsletter_message_subject</code></td>
                                <td>
                                    <?php echo has_filter('newsletter_message_subject') ? '' : '-' ?>
                                    <?php echo $this->get_hook_functions('newsletter_message_subject') ?>
                                    <br>
                                    Deprecated, use <code>newsletter_message</code>.
                                </td>
                            </tr>

                            <tr>
                                <td><code>newsletter_replace</code></td>
                                <td>
                                    <?php echo has_filter('newsletter_replace') ? '' : '-' ?>
                                    <?php echo $this->get_hook_functions('newsletter_replace') ?>
                                </td>
                            </tr>
                            <tr>
                                <td><code>newsletter_replace_name</code></td>
                                <td>
                                    <?php echo has_filter('newsletter_replace_name') ? '' : '-' ?>
                                    <?php echo $this->get_hook_functions('newsletter_replace_name') ?>
                                </td>
                            </tr>
                            <tr>
                                <td><code>newsletter_current_language</code></td>
                                <td>
                                    <?php echo has_filter('newsletter_current_language') ? '' : '-' ?>
                                    <?php echo $this->get_hook_functions('newsletter_current_language') ?>
                                </td>
                            </tr>
                            <tr>
                                <td><code>newsletter_is_multilanguage</code></td>
                                <td>
                                    <?php echo has_filter('newsletter_is_multilanguage') ? '' : '-' ?>
                                    <?php echo $this->get_hook_functions('newsletter_is_multilanguage') ?>
                                </td>
                            </tr>
                            <tr>
                                <td><code>newsletter_languages</code></td>
                                <td>
                                    <?php echo has_filter('newsletter_languages') ? '' : '-' ?>
                                    <?php echo $this->get_hook_functions('newsletter_languages') ?>
                                </td>
                            </tr>
                            <tr>
                                <td><code>newsletter_send_user</code></td>
                                <td>
                                    <?php echo has_filter('newsletter_send_user') ? '' : '-' ?>
                                    <?php echo $this->get_hook_functions('newsletter_send_user') ?>
                                </td>
                            </tr>
                            <tr>
                                <td><code>newsletter_enqueue_style</code></td>
                                <td>
                                    <?php echo has_filter('newsletter_enqueue_style') ? '' : '-' ?>
                                    <?php echo $this->get_hook_functions('newsletter_enqueue_style') ?>
                                </td>
                            </tr>
                            <tr>
                                <td><code>get_the_excerpt</code></td>
                                <td>
                                    <?php echo has_filter('get_the_excerpt') ? '' : '-' ?>
                                    <?php echo $this->get_hook_functions('get_the_excerpt') ?>
                                </td>
                            </tr>
                        </tbody>
                    </table>
                </div>


                <div id="tabs-plugins">
                    <table class="widefat" id="tnp-status-table">
                        <thead>
                            <tr>
                                <th>Plugin</th>
                                <th></th>
                                <th>Note</th>
                            </tr>
                        </thead>
                        <tbody>

                            <?php if (is_plugin_active('health-check/health-check.php')) { ?>
                                <tr>
                                    <td><a href="https://wordpress.org/plugins/health-check/" target="_blank">Health Check</a></td>
                                    <td>
                                        <span class="tnp-maybe">MAY BE</span>
                                    </td>
                                    <td>
                                        We found problems with the WP scheduler (afftecting Newsletter and other plugins). Be sure, once
                                        deactovated, even the
                                        <a href="<?php echo esc_attr(admin_url('plugins.php')); ?>?plugin_status=mustuse" target="_blank">must use part of that plugin</a>
                                        is removed.
                                    </td>
                                </tr>
                            <?php } ?>
                            <?php if (is_plugin_active('wp-html-email/wp-html-email.php')) { ?>
                                <tr>
                                    <td><a href="https://wordpress.org/plugins/wp-html-email/" target="_blank">WP HMTL Email</a></td>
                                    <td>
                                        <span class="tnp-maybe">MAY BE</span>
                                    </td>
                                    <td>
                                        Usually it add code to newsletters breacking the formatting.
                                    </td>
                                </tr>
                            <?php } ?>
                            <?php if (is_plugin_active('plugin-load-filter/plugin-load-filter.php')) { ?>
                                <tr>
                                    <td><a href="https://wordpress.org/plugins/plugin-load-filter/" target="_blank">Plugin load filter</a></td>
                                    <td>
                                        <span class="tnp-maybe">MAY BE</span>
                                    </td>
                                    <td>
                                        Be sure Newsletter and all addons is set as active on EVERY context.
                                    </td>
                                </tr>
                            <?php } ?>

                            <?php if (is_plugin_active('wp-asset-clean-up/wpacu.php')) { ?>
                                <tr>
                                    <td><a href="https://wordpress.org/plugins/wp-asset-clean-up/" target="_blank">WP Asset Clean Up</a></td>
                                    <td>
                                        <span class="tnp-maybe">MAY BE</span>
                                    </td>
                                    <td>
                                        Be sure Newsletter and all addons is set as active on EVERY context.
                                    </td>
                                </tr>
                            <?php } ?>

                            <?php if (is_plugin_active('wp-asset-clean-up-pro/wpacu.php')) { ?>
                                <tr>
                                    <td>WP Asset Clean Up Pro</td>
                                    <td>
                                        <span class="tnp-maybe">MAY BE</span>
                                    </td>
                                    <td>
                                        Be sure Newsletter and all addons is set as active on EVERY context.
                                    </td>
                                </tr>
                            <?php } ?>

                            <?php if (is_plugin_active('freesoul-deactivate-plugins/freesoul-deactivate-plugins.php')) { ?>
                                <tr>
                                    <td><a href="https://wordpress.org/plugins/freesoul-deactivate-plugins/" target="_blank">Freesoul Deactivate Plugins</a></td>
                                    <td>
                                        <span class="tnp-maybe">MAY BE</span>
                                    </td>
                                    <td>
                                        Be sure Newsletter and all addons is set as active on EVERY context.
                                    </td>
                                </tr>
                            <?php } ?>

                        </tbody>
                    </table>
                </div>

                <div id="tabs-wordpress">

                    <table class="widefat" id="tnp-status-table">
                        <thead>
                            <tr>
                                <th>Parameter</th>
                                <th></th>
                                <th>Note</th>
                            </tr>
                        </thead>
                        <tbody>

                            <tr>
                                <?php
                                $condition = (defined('WP_DEBUG') && WP_DEBUG) ? 2 : 1;
                                ?>
                                <td>
                                    WordPress debug mode
                                </td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php if (defined('WP_DEBUG') && WP_DEBUG) { ?>
                                        WordPress is in debug mode it is not recommended on a public site. See the constant <code>WP_DEBUG</code> inside the <code>wp-config.php</code>.
                                    <?php } else { ?>

                                    <?php } ?>
                                </td>
                            </tr>



                            <tr>
                                <?php
                                $charset = get_option('blog_charset');
                                $condition = $charset === 'UTF-8' ? 1 : 0;
                                ?>
                                <td>Blog Charset</td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    Charset: <?php echo esc_html($charset) ?>
                                    <br>

                                    <?php if ($condition == 1) { ?>

                                    <?php } else { ?>
                                        It is recommended to use
                                        the <code>UTF-8</code> charset but the <a href="https://codex.wordpress.org/Converting_Database_Character_Sets" target="_blank">conversion</a>
                                        could be tricky. If you're not experiencing problem, leave things as is.
                                    <?php } ?>
                                </td>
                            </tr>

                            <tr>
                                <?php
                                $condition = (strpos(home_url('/'), 'http') !== 0) ? 0 : 1;
                                ?>
                                <td>Home URL</td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    Value: <?php echo home_url('/'); ?>
                                    <br>
                                    <?php if ($condition == 0) { ?>
                                        Your home URL is not absolute, emails require absolute URLs.
                                        Probably you have a protocol agnostic plugin installed to manage both HTTPS and HTTP in your
                                        blog.
                                    <?php } else { ?>

                                    <?php } ?>
                                </td>
                            </tr>

                            <tr>
                                <?php
                                $condition = (strpos(WP_CONTENT_URL, 'http') !== 0) ? 0 : 1;
                                ?>
                                <td>WP_CONTENT_URL</td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    Value: <?php echo esc_html(WP_CONTENT_URL); ?>
                                    <br>
                                    <?php if ($condition == 0) { ?>
                                        Your content URL is not absolute, emails require absolute URLs when they have images inside.
                                        Newsletter tries to deal with this problem but when a problem with images persists, you should try to remove
                                        from your <code>wp-config.php</code> the <code>WP_CONTENT_URL</code> define and check again.
                                    <?php } else { ?>

                                    <?php } ?>
                                </td>
                            </tr>

                            <tr>
                                <?php
                                $attachments = get_posts([
                                    'post_type' => 'attachment',
                                    'post_mime_type' => 'image',
                                    'numberposts' => 1,
                                    'post_status' => null,
                                    'post_parent' => null
                                ]);
                                $condition = 1;
                                $src = 'No media found to make a test';
                                if ($attachments) {
                                    $src = wp_get_attachment_image_src($attachments[0]->ID);
                                    $src = $src[0];
                                    $condition = (strpos($src, 'http') !== 0) ? 0 : 1;
                                }
                                ?>
                                <td>Images URL</td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    Example: <?php echo esc_html($src); ?>

                                    <?php if ($condition == 0) { ?>
                                        <br><br>
                                        Your uploaded images seems to be returned with a relative URL: they won't work in your newsletter. Check the <code>WP_CONTENT_URL</code>
                                        above and fix it if is showing a warning. If not, probably a plugin or some custom code is forcing relative URLs for your
                                        images. Check that with your site developer.
                                    <?php } else { ?>

                                    <?php } ?>
                                </td>
                            </tr>



                            <tr>
                                <?php
                                $uploads = wp_upload_dir();
                                ?>
                                <td>Uploads dir and url</td>
                                <td>

                                </td>
                                <td>
                                    <table class="widefat" style="width: auto">
                                        <thead>
                                            <tr><th>Key</th><th>Value</th></tr>
                                        </thead>
                                        <tbody>
                                            <?php foreach ($uploads as $k => $v) { ?>
                                                <tr><td><?php echo esc_html($k) ?></td><td><?php echo esc_html($v) ?></td></tr>
                                            <?php } ?>
                                        </tbody>
                                    </table>

                                </td>
                            </tr>

                            <tr>
                                <?php
                                set_transient('newsletter_transient_test', 1, 300);
                                delete_transient('newsletter_transient_test');
                                $res = get_transient('newsletter_transient_test');
                                $condition = ($res !== false) ? 0 : 1;
                                ?>
                                <td>WordPress transients</td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php if ($res !== false) { ?>
                                        Transients cannot be deleted. This can block the delivery engine. Usually it is due to a not well coded plugin installed.
                                    <?php } else { ?>
                                    <?php } ?>
                                </td>
                            </tr>
                        </tbody>
                    </table>

                </div>

                <div id="tabs-php">
                    <table class="widefat" id="tnp-status-table">
                        <thead>
                            <tr>
                                <th>Parameter</th>
                                <th></th>
                                <th>Action</th>
                            </tr>
                        </thead>
                        <tbody>
                            <tr>
                                <td>PHP version</td>
                                <td>
                                    <?php if (version_compare(phpversion(), '5.6', '<')) { ?>
                                        <span class="tnp-ko">KO</span>
                                    <?php } else { ?>
                                        <span class="tnp-ok">OK</span>
                                    <?php } ?>

                                </td>
                                <td>
                                    Your PHP version is <?php echo phpversion() ?><br>
                                    <?php if (version_compare(phpversion(), '5.3', '<')) { ?>
                                        Newsletter plugin works correctly with PHP version 5.6 or greater. Ask your provider to upgrade your PHP. Your version is
                                        unsupported even by the PHP community.
                                    <?php } ?>
                                </td>

                            </tr>

                            <tr>
                                <?php
                                $value = (int) ini_get('max_execution_time');
                                $res = true;
                                $condition = 1;
                                if ($value != 0 && $value < NEWSLETTER_CRON_INTERVAL) {
                                    $res = set_time_limit(NEWSLETTER_CRON_INTERVAL);
                                    if ($res)
                                        $condition = 1;
                                    else
                                        $condition = 0;
                                }
                                ?>
                                <td>PHP execution time limit</td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php if (!$res) { ?>
                                        Your PHP execution time limit is <?php echo $value ?> seconds. It cannot be changed and it is too lower to grant the maximum delivery rate of Newsletter.
                                    <?php } else { ?>
                                        Your PHP execution time limit is <?php echo $value ?> seconds and can be changed by the Newsletter plugin.<br>
                                    <?php } ?>

                                </td>

                            </tr>


                            <tr>
                                <?php
                                // Problems with some addons die to github.com/openssl/openssl/issues/19589
                                $condition = function_exists('curl_version');
                                $version = null;
                                if ($condition) {
                                    $version = curl_version();
                                    if (strpos($version['ssl_version'], '3.0.7') !== false) {
                                        $condition = false;
                                    }
                                }
                                ?>
                                <td>Curl version</td>
                                <td>
                                    <?php if (!$condition) { ?>
                                        <span class="tnp-ko">KO</span>
                                    <?php } else { ?>
                                        <span class="tnp-ok">OK</span>
                                    <?php } ?>

                                </td>
                                <td>
                                    <?php
                                    if (!$condition) {
                                        echo 'cUrl is not available or with a bugger openssl version: ask the provider to install it and activate the PHP cUrl library or openssl version is the bugged 3.0.7<br>';
                                    }
                                    if ($version) {
                                        echo 'Version: ' . esc_html($version['version']) . '<br>';
                                        echo 'SSL Version: ' . esc_html($version['ssl_version']) . '<br>';
                                    }
                                    ?>
                                </td>

                            </tr>
                            <?php if (!empty(ini_get('opcache.enable')) && ini_get('opcache.validate_timestamps') === '0') { ?>
                                <tr>
                                    <td>
                                        Opcache
                                    </td>

                                    <td>
                                        <span class="tnp-ko">KO</span>
                                    </td>

                                    <td>
                                        You have the PHP opcache active with file validation disable so every blog plugins update needs a webserver restart!
                                    </td>
                                </tr>
                            <?php } ?>
                        </tbody>
                    </table>
                </div>


                <div id="tabs-database">
                    <table class="widefat" id="tnp-status-table">
                        <thead>
                            <tr>
                                <th>Parameter</th>
                                <th></th>
                                <th>Note</th>
                            </tr>
                        </thead>
                        <tbody>
                            <tr>
                                <td>DB_CHARSET</td>
                                <td></td>
                                <td>
                                    <?php
                                    if (defined('DB_CHARSET')) {
                                        echo esc_html(DB_CHARSET);
                                    } else {
                                        echo 'Not defined';
                                    }
                                    ?>
                                </td>
                            </tr>
                            <tr>
                                <td>DB_COLLATE</td>
                                <td></td>
                                <td>
                                    <?php
                                    if (defined('DB_COLLATE')) {
                                        echo esc_html(DB_COLLATE);
                                    } else {
                                        echo 'Not defined';
                                    }
                                    ?>
                                </td>
                            </tr>

                            <tr>
                                <td>$wpdb charset</td>
                                <td>
                                    <?php if ($wpdb->charset != 'utf8mb4') { ?>
                                        <span class="tnp-ko">KO</span>
                                    <?php } else { ?>
                                        <span class="tnp-ok">OK</span>
                                    <?php } ?>

                                </td>
                                <td>
                                    Charset: <?php echo $wpdb->charset; ?>
                                    <br>
                                    <?php if ($wpdb->charset != 'utf8mb4') { ?>
                                        The recommended charset for your database is <code>utf8mb4</code> to avoid possible saving errors when you use emoji.
                                        Read the WordPress Codex <a href="https://codex.wordpress.org/Converting_Database_Character_Sets" target="_blank">conversion
                                            instructions</a> (skilled technicia required).
                                    <?php } else { ?>
                                        If you experience newsletter saving database error
                                        <?php $controls->button('conversion', 'Try tables upgrade') ?>
                                    <?php } ?>
                                </td>
                            </tr>

                            <tr>
                                <td>get_table_charset()</td>
                                <td>

                                </td>
                                <td>
                                    <?php echo esc_html(NEWSLETTER_USERS_TABLE), ': ', esc_html($tnp_wpdb->get_table_charset(NEWSLETTER_USERS_TABLE)) ?>
                                </td>
                            </tr>




                            <?php
                            $wait_timeout = $wpdb->get_var("select @@wait_timeout");
                            $condition = ($wait_timeout < 30) ? 0 : 1;
                            ?>
                            <tr>
                                <td>Database wait timeout</td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    Your database wait timeout is <?php echo $wait_timeout; ?> seconds<br>
                                    <?php if ($wait_timeout < 30) { ?>
                                        That value is low and could produce database connection errors while sending emails or during long import
                                        sessions. Ask the provider to raise it at least to 60 seconds.
                                    <?php } ?>
                                </td>
                            </tr>

                            <?php
                            $res = $wpdb->query("drop table if exists {$wpdb->prefix}newsletter_test");
                            $res = $wpdb->query("create table if not exists {$wpdb->prefix}newsletter_test (id int(20))");
                            $condition = $res === false ? 0 : 1;
                            ?>
                            <tr>
                                <td>Database table creation</td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php if ($res === false) { ?>
                                        Check the privileges of the user you use to connect to the database, it seems it cannot create tables.<br>
                                        (<?php echo esc_html($wpdb->last_error) ?>)
                                    <?php } else { ?>
                                    <?php } ?>
                                </td>
                            </tr>

                            <?php
                            $res = $wpdb->query("alter table {$wpdb->prefix}newsletter_test add column id1 int(20)");
                            $condition = $res === false ? 0 : 1;
                            ?>
                            <tr>
                                <td>Database table change</td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php if ($res === false) { ?>
                                        Check the privileges of the user you use to connect to the database, it seems it cannot change the tables. It's require to update the
                                        plugin.<br>
                                        (<?php echo esc_html($wpdb->last_error) ?>)
                                    <?php } else { ?>
                                    <?php } ?>
                                </td>
                            </tr>

                            <?php
// Clean up
                            $res = $wpdb->query("drop table if exists {$wpdb->prefix}newsletter_test");
                            ?>

                            <?php if (!get_option('newsletter_stats_email_column_upgraded', false)) { ?>
                                <?php
                                $data_type = $wpdb->get_var(
                                        $wpdb->prepare('SELECT DATA_TYPE FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = %s AND TABLE_NAME = %s AND COLUMN_NAME = %s',
                                                DB_NAME, NEWSLETTER_STATS_TABLE, 'email_id'));

                                $to_upgrade = strtoupper($data_type) == 'INT' ? false : true;
                                ?>
                                <?php if ($to_upgrade) { ?>
                                    <tr>
                                        <td>Database stats table upgrade</td>
                                        <td><?php $this->condition_flag(0) ?></td>
                                        <td><?php
                                            echo strtoupper($data_type);
                                            $controls->button('stats_email_column_upgrade', 'Stats table upgrade')
                                            ?></td>
                                    </tr>
                                <?php } ?>
                            <?php } ?>

                        </tbody>
                    </table>


                    <h3>Tables</h3>
                    <table class="widefat">
                        <thead>
                            <tr>
                                <th>Table</th>
                                <th></th>
                                <th>Database check result</th>
                            </tr>
                        </thead>
                        <tbody>
                            <?php
                            $r = $wpdb->get_row("check table " . esc_sql(NEWSLETTER_USERS_TABLE));
                            $condition = $r->Msg_text == 'OK' ? 1 : 0;
                            ?>
                            <tr>
                                <td><code><?php echo esc_html(NEWSLETTER_USERS_TABLE) ?></code></td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php esc_html(print_r($r)) ?>
                                </td>
                            </tr>
                            <?php
                            $r = $wpdb->get_row("check table " . esc_sql(NEWSLETTER_EMAILS_TABLE));
                            $condition = $r->Msg_text == 'OK' ? 1 : 0;
                            ?>
                            <tr>
                                <td><code><?php echo esc_html(NEWSLETTER_EMAILS_TABLE) ?></code></td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php esc_html(print_r($r)) ?>
                                </td>
                            </tr>
                            <?php
                            $r = $wpdb->get_row("check table " . esc_sql(NEWSLETTER_SENT_TABLE));
                            $condition = $r->Msg_text == 'OK' ? 1 : 0;
                            ?>
                            <tr>
                                <td><code><?php echo esc_html(NEWSLETTER_SENT_TABLE) ?></code></td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php esc_html(print_r($r)) ?>
                                </td>
                            </tr>
                            <?php
                            $r = $wpdb->get_row("check table " . esc_sql(NEWSLETTER_STATS_TABLE));
                            $condition = $r->Msg_text == 'OK' ? 1 : 0;
                            ?>
                            <tr>
                                <td><code><?php echo esc_html(NEWSLETTER_STATS_TABLE) ?></code></td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php esc_html(print_r($r)) ?>
                                </td>
                            </tr>

                            <?php
                            $r = $wpdb->get_row("check table " . esc_sql(NEWSLETTER_SENT_TABLE));
                            $condition = $r->Msg_text == 'OK' ? 1 : 0;
                            ?>
                            <tr>
                                <td><code><?php echo esc_html(NEWSLETTER_SENT_TABLE) ?></code></td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php esc_html(print_r($r)) ?>
                                </td>
                            </tr>

                            <?php
                            $r = $wpdb->get_row("check table " . esc_sql(NEWSLETTER_USERS_META_TABLE));
                            $condition = $r->Msg_text == 'OK' ? 1 : 0;
                            ?>
                            <tr>
                                <td><code><?php echo esc_html(NEWSLETTER_USERS_META_TABLE) ?></code></td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php esc_html(print_r($r)) ?>
                                </td>
                            </tr>

                            <?php
                            $r = $wpdb->get_row("check table " . esc_sql(NEWSLETTER_LOGS_TABLE));
                            $condition = $r->Msg_text == 'OK' ? 1 : 0;
                            ?>
                            <tr>
                                <td><code><?php echo esc_html(NEWSLETTER_LOGS_TABLE) ?></code></td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php esc_html(print_r($r)) ?>
                                </td>
                            </tr>

                            <?php
                            $r = $wpdb->get_row("check table " . esc_sql($wpdb->options));
                            $condition = $r->Msg_text == 'OK' ? 1 : 0;
                            ?>
                            <tr>
                                <td><code><?php echo esc_html($wpdb->options) ?></code></td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php esc_html(print_r($r)) ?>
                                </td>
                            </tr>

                            <?php
                            $r = $wpdb->get_row("check table " . esc_sql($wpdb->users));
                            $condition = $r->Msg_text == 'OK' ? 1 : 0;
                            ?>
                            <tr>
                                <td><code><?php echo esc_html($wpdb->users) ?></code></td>
                                <td>
                                    <?php $this->condition_flag($condition) ?>
                                </td>
                                <td>
                                    <?php esc_html(print_r($r)) ?>
                                </td>
                            </tr>

                            <?php if (class_exists('NewsletterAutomated')) { ?>
                                <?php
                                $r = $wpdb->get_row("check table " . $wpdb->prefix . 'newsletter_automated');
                                $condition = $r->Msg_text == 'OK' ? 1 : 0;
                                ?>
                                <tr>
                                    <td><code><?php echo $wpdb->prefix . 'newsletter_automated' ?></code></td>
                                    <td>
                                        <?php $this->condition_flag($condition) ?>
                                    </td>
                                    <td>
                                        <?php esc_html(print_r($r)) ?>
                                    </td>
                                </tr>
                            <?php } ?>

                            <?php if (class_exists('NewsletterAutoresponder')) { ?>
                                <?php
                                $r = $wpdb->get_row("check table " . $wpdb->prefix . 'newsletter_autoresponder');
                                $condition = $r->Msg_text == 'OK' ? 1 : 0;
                                ?>
                                <tr>
                                    <td><code><?php echo $wpdb->prefix . 'newsletter_autoresponder' ?></code></td>
                                    <td>
                                        <?php $this->condition_flag($condition) ?>
                                    </td>
                                    <td>
                                        <?php esc_html(print_r($r)) ?>
                                    </td>
                                </tr>
                                <?php
                                $r = $wpdb->get_row("check table " . $wpdb->prefix . 'newsletter_autoresponder_steps');
                                $condition = $r->Msg_text == 'OK' ? 1 : 0;
                                ?>
                                <tr>
                                    <td><code><?php echo $wpdb->prefix . 'newsletter_autoresponder_steps' ?></code></td>
                                    <td>
                                        <?php $this->condition_flag($condition) ?>
                                    </td>
                                    <td>
                                        <?php esc_html(print_r($r)) ?>
                                    </td>
                                </tr>
                            <?php } ?>
                        </tbody>
                    </table>
                </div>



                <div id="tabs-parameters">

                    <table class="widefat" id="tnp-parameters-table">
                        <thead>
                            <tr>
                                <th>Parameter</th>
                                <th>Value</th>
                            </tr>
                        </thead>
                        <tbody>

                            <tr>
                                <td>NEWSLETTER_VERSION</td>
                                <td>
                                    <?php echo esc_html(NEWSLETTER_VERSION) ?>
                                </td>
                            </tr>

                            <tr>
                                <td>NEWSLETTER_CRON_INTERVAL</td>
                                <td>
                                    <?php echo esc_html(NEWSLETTER_CRON_INTERVAL) ?> (seconds)
                                </td>
                            </tr>

                            <tr>
                                <td>NEWSLETTER_PAGE_WARNING</td>
                                <td>
                                    <?php echo NEWSLETTER_PAGE_WARNING ? 'true' : 'false' ?>
                                </td>
                            </tr>
                            <?php
                            if (!defined('NEWSLETTER_ANTIBOT'))
                                define('NEWSLETTER_ANTIBOT', true);
                            ?>
                            <tr>
                                <td>NEWSLETTER_ANTIBOT</td>
                                <td>
                                    <?php echo NEWSLETTER_ANTIBOT ? 'true' : 'false' ?>
                                </td>
                            </tr>

                            <tr>
                                <td>NEWSLETTER_SEND_DELAY</td>
                                <td>
                                    <?php echo esc_html(NEWSLETTER_SEND_DELAY) ?> (milliseconds)
                                </td>
                            </tr>
                            <tr>
                                <td>NEWSLETTER_TRACKING_TYPE</td>
                                <td>
                                    <?php echo esc_html(NEWSLETTER_TRACKING_TYPE) ?>
                                </td>
                            </tr>
                            <tr>
                                <td>NEWSLETTER_ACTION_TYPE</td>
                                <td>
                                    <?php echo esc_html(NEWSLETTER_ACTION_TYPE) ?>
                                </td>
                            </tr>

                            <tr>
                                <td>NEWSLETTER_MAX_EXECUTION_TIME</td>
                                <td>
                                    <?php
                                    if (defined('NEWSLETTER_MAX_EXECUTION_TIME')) {
                                        echo esc_html(NEWSLETTER_MAX_EXECUTION_TIME) . ' (seconds)';
                                    } else {
                                        echo 'Not set';
                                    }
                                    ?>
                                </td>
                            </tr>

                            <tr>
                                <td>NEWSLETTER_LIST_MAX</td>
                                <td>
                                    <?php echo esc_html(NEWSLETTER_LIST_MAX) ?>
                                </td>
                            </tr>

                            <tr>
                                <td>NEWSLETTER_PROFILE_MAX</td>
                                <td>
                                    <?php echo esc_html(NEWSLETTER_PROFILE_MAX) ?>
                                </td>
                            </tr>

                            <tr>
                                <td>NEWSLETTER_USE_POST_GALLERY</td>
                                <td>
                                    <?php echo NEWSLETTER_USE_POST_GALLERY ? 'true' : 'false' ?>
                                </td>
                            </tr>

                            <tr>
                                <td>NEWSLETTER_MULTILANGUAGE</td>
                                <td>
                                    <?php echo defined('NEWSLETTER_MULTILANGUAGE') ? (NEWSLETTER_MULTILANGUAGE ? 'true' : 'false') : 'false'; ?>
                                </td>
                            </tr>

                            <tr>
                                <td>Absolute path</td>
                                <td>
                                    <?php echo esc_html(ABSPATH); ?>
                                </td>
                            </tr>
                            <tr>
                                <td>Tables Prefix</td>
                                <td>
                                    <?php echo $wpdb->prefix; ?>
                                </td>
                            </tr>
                        </tbody>
                    </table>
                </div>
            </div>

            <?php if (isset($_GET['advanced'])) { ?>



                <h3>Database tables' structure</h3>
                <?php tnp_describe_table('newsletter') ?>
                <?php tnp_describe_table('newsletter_emails') ?>
                <?php tnp_describe_table('newsletter_sent') ?>
                <?php tnp_describe_table('newsletter_stats') ?>

                <h3>Update plugins data</h3>
                <pre style="font-size: 11px; font-family: monospace; background-color: #efefef; color: #444"><?php echo esc_html(print_r(get_site_transient('update_plugins'), true)); ?></pre>

            <?php } else { ?>

                <p>
                    <a href="?page=newsletter_system_status&advanced=1">Show advanced parameters</a>
                </p>
            <?php } ?>
        </form>
    </div>

    <?php include NEWSLETTER_ADMIN_FOOTER; ?>

</div>