<?php

function network_domain_check()
{
    global $wpdb;
    $sql = $wpdb->prepare('SHOW TABLES LIKE %s', $wpdb->esc_like($wpdb->site));
    if ($wpdb->get_var($sql)) {
        return $wpdb->get_var("SELECT domain FROM {$wpdb->site} ORDER BY id ASC LIMIT 1");
    }
    return false;
}
function allow_subdomain_install()
{
    $domain = preg_replace('|https?://([^/]+)|', '$1', get_option('home'));
    if (parse_url(get_option('home'), PHP_URL_PATH) || 'localhost' === $domain || preg_match('|^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+$|', $domain)) {
        return false;
    }
    return true;
}
function allow_subdirectory_install()
{
    global $wpdb;
    if (apply_filters('allow_subdirectory_install', false)) {
        return true;
    }
    if (defined('ALLOW_SUBDIRECTORY_INSTALL') && ALLOW_SUBDIRECTORY_INSTALL) {
        return true;
    }
    $post = $wpdb->get_row("SELECT ID FROM {$wpdb->posts} WHERE post_date < DATE_SUB(NOW(), INTERVAL 1 MONTH) AND post_status = 'publish'");
    if (empty($post)) {
        return true;
    }
    return false;
}
function get_clean_basedomain()
{
    $existing_domain = network_domain_check();
    if ($existing_domain) {
        return $existing_domain;
    }
    $domain = preg_replace('|https?://|', '', get_option('siteurl'));
    $slash = strpos($domain, '/');
    if ($slash) {
        $domain = substr($domain, 0, $slash);
    }
    return $domain;
}
function network_step1($errors = false)
{
    global $is_apache;
    if (defined('DO_NOT_UPGRADE_GLOBAL_TABLES')) {
        echo '<div class="error"><p><strong>' . __('Error:') . '</strong> ' . sprintf(__('The constant %s cannot be defined when creating a network.'), '<code>DO_NOT_UPGRADE_GLOBAL_TABLES</code>') . '</p></div>';
        echo '</div>';
        require_once ABSPATH . 'wp-admin/admin-footer.php';
        die;
    }
    $active_plugins = get_option('active_plugins');
    if (!empty($active_plugins)) {
        echo '<div class="notice notice-warning"><p><strong>' . __('Warning:') . '</strong> ' . sprintf(__('Please <a href="%s">deactivate your plugins</a> before enabling the Network feature.'), admin_url('plugins.php?plugin_status=active')) . '</p></div>';
        echo '<p>' . __('Once the network is created, you may reactivate your plugins.') . '</p>';
        echo '</div>';
        require_once ABSPATH . 'wp-admin/admin-footer.php';
        die;
    }
    $hostname = get_clean_basedomain();
    $has_ports = strstr($hostname, ':');
    if (false !== $has_ports && !in_array($has_ports, array(':80', ':443'), true)) {
        echo '<div class="error"><p><strong>' . __('Error:') . '</strong> ' . __('You cannot install a network of sites with your server address.') . '</p></div>';
        echo '<p>' . sprintf(__('You cannot use port numbers such as %s.'), '<code>' . $has_ports . '</code>') . '</p>';
        echo '<a href="' . esc_url(admin_url()) . '">' . __('Go to Dashboard') . '</a>';
        echo '</div>';
        require_once ABSPATH . 'wp-admin/admin-footer.php';
        die;
    }
    echo '<form method="post">';
    wp_nonce_field('install-network-1');
    $error_codes = array();
    if (is_wp_error($errors)) {
        echo '<div class="error"><p><strong>' . __('Error: The network could not be created.') . '</strong></p>';
        foreach ($errors->get_error_messages() as $error) {
            echo "<p>{$error}</p>";
        }
        echo '</div>';
        $error_codes = $errors->get_error_codes();
    }
    if (!empty($_POST['sitename']) && !in_array('empty_sitename', $error_codes, true)) {
        $site_name = $_POST['sitename'];
    } else {
        $site_name = sprintf(__('%s Sites'), get_option('blogname'));
    }
    if (!empty($_POST['email']) && !in_array('invalid_email', $error_codes, true)) {
        $admin_email = $_POST['email'];
    } else {
        $admin_email = get_option('admin_email');
    }
    ?>
	<p><?php 
    _e('Welcome to the Network installation process!');
    ?></p>
	<p><?php 
    _e('Fill in the information below and you&#8217;ll be on your way to creating a network of WordPress sites. We will create configuration files in the next step.');
    ?></p>
	<?php 
    if (isset($_POST['subdomain_install'])) {
        $subdomain_install = (bool) $_POST['subdomain_install'];
    } elseif (apache_mod_loaded('mod_rewrite')) {
        $subdomain_install = true;
    } elseif (!allow_subdirectory_install()) {
        $subdomain_install = true;
    } else {
        $subdomain_install = false;
        $got_mod_rewrite = got_mod_rewrite();
        if ($got_mod_rewrite) {
            echo '<div class="updated inline"><p><strong>' . __('Note:') . '</strong> ';
            printf(__('Please make sure the Apache %s module is installed as it will be used at the end of this installation.'), '<code>mod_rewrite</code>');
            echo '</p>';
        } elseif ($is_apache) {
            echo '<div class="error inline"><p><strong>' . __('Warning:') . '</strong> ';
            printf(__('It looks like the Apache %s module is not installed.'), '<code>mod_rewrite</code>');
            echo '</p>';
        }
        if ($got_mod_rewrite || $is_apache) {
            echo '<p>';
            printf(__('If %1$s is disabled, ask your administrator to enable that module, or look at the <a href="%2$s">Apache documentation</a> or <a href="%3$s">elsewhere</a> for help setting it up.'), '<code>mod_rewrite</code>', 'https://httpd.apache.org/docs/mod/mod_rewrite.html', 'https://www.google.com/search?q=apache+mod_rewrite');
            echo '</p></div>';
        }
    }
    if (allow_subdomain_install() && allow_subdirectory_install()) {
        ?>
		<h3><?php 
        esc_html_e('Addresses of Sites in your Network');
        ?></h3>
		<p><?php 
        _e('Please choose whether you would like sites in your WordPress network to use sub-domains or sub-directories.');
        ?>
			<strong><?php 
        _e('You cannot change this later.');
        ?></strong></p>
		<p><?php 
        _e('You will need a wildcard DNS record if you are going to use the virtual host (sub-domain) functionality.');
        ?></p>
		<?php 
        ?>
		<table class="form-table" role="presentation">
			<tr>
				<th><label><input type="radio" name="subdomain_install" value="1"<?php 
        checked($subdomain_install);
        ?> /> <?php 
        _e('Sub-domains');
        ?></label></th>
				<td>
				<?php 
        printf(_x('like <code>site1.%1$s</code> and <code>site2.%1$s</code>', 'subdomain examples'), $hostname);
        ?>
				</td>
			</tr>
			<tr>
				<th><label><input type="radio" name="subdomain_install" value="0"<?php 
        checked(!$subdomain_install);
        ?> /> <?php 
        _e('Sub-directories');
        ?></label></th>
				<td>
				<?php 
        printf(_x('like <code>%1$s/site1</code> and <code>%1$s/site2</code>', 'subdirectory examples'), $hostname);
        ?>
				</td>
			</tr>
		</table>

		<?php 
    }
    if (WP_CONTENT_DIR !== ABSPATH . 'wp-content' && (allow_subdirectory_install() || !allow_subdomain_install())) {
        echo '<div class="error inline"><p><strong>' . __('Warning:') . '</strong> ' . __('Subdirectory networks may not be fully compatible with custom wp-content directories.') . '</p></div>';
    }
    $is_www = 0 === strpos($hostname, 'www.');
    if ($is_www) {
        ?>
		<h3><?php 
        esc_html_e('Server Address');
        ?></h3>
		<p>
		<?php 
        printf(__('We recommend you change your site domain to %1$s before enabling the network feature. It will still be possible to visit your site using the %3$s prefix with an address like %2$s but any links will not have the %3$s prefix.'), '<code>' . substr($hostname, 4) . '</code>', '<code>' . $hostname . '</code>', '<code>www</code>');
        ?>
		</p>
		<table class="form-table" role="presentation">
			<tr>
			<th scope='row'><?php 
        esc_html_e('Server Address');
        ?></th>
			<td>
				<?php 
        printf(__('The internet address of your network will be %s.'), '<code>' . $hostname . '</code>');
        ?>
				</td>
			</tr>
		</table>
		<?php 
    }
    ?>

		<h3><?php 
    esc_html_e('Network Details');
    ?></h3>
		<table class="form-table" role="presentation">
		<?php 
    if ('localhost' === $hostname) {
        ?>
			<tr>
				<th scope="row"><?php 
        esc_html_e('Sub-directory Installation');
        ?></th>
				<td>
				<?php 
        printf(__('Because you are using %1$s, the sites in your WordPress network must use sub-directories. Consider using %2$s if you wish to use sub-domains.'), '<code>localhost</code>', '<code>localhost.localdomain</code>');
        if (!allow_subdirectory_install()) {
            echo ' <strong>' . __('Warning:') . ' ' . __('The main site in a sub-directory installation will need to use a modified permalink structure, potentially breaking existing links.') . '</strong>';
        }
        ?>
				</td>
			</tr>
		<?php 
    } elseif (!allow_subdomain_install()) {
        ?>
			<tr>
				<th scope="row"><?php 
        esc_html_e('Sub-directory Installation');
        ?></th>
				<td>
				<?php 
        _e('Because your installation is in a directory, the sites in your WordPress network must use sub-directories.');
        if (!allow_subdirectory_install()) {
            echo ' <strong>' . __('Warning:') . ' ' . __('The main site in a sub-directory installation will need to use a modified permalink structure, potentially breaking existing links.') . '</strong>';
        }
        ?>
				</td>
			</tr>
		<?php 
    } elseif (!allow_subdirectory_install()) {
        ?>
			<tr>
				<th scope="row"><?php 
        esc_html_e('Sub-domain Installation');
        ?></th>
				<td>
				<?php 
        _e('Because your installation is not new, the sites in your WordPress network must use sub-domains.');
        echo ' <strong>' . __('The main site in a sub-directory installation will need to use a modified permalink structure, potentially breaking existing links.') . '</strong>';
        ?>
				</td>
			</tr>
		<?php 
    }
    ?>
		<?php 
    if (!$is_www) {
        ?>
			<tr>
				<th scope='row'><?php 
        esc_html_e('Server Address');
        ?></th>
				<td>
					<?php 
        printf(__('The internet address of your network will be %s.'), '<code>' . $hostname . '</code>');
        ?>
				</td>
			</tr>
		<?php 
    }
    ?>
			<tr>
				<th scope='row'><label for="sitename"><?php 
    esc_html_e('Network Title');
    ?></label></th>
				<td>
					<input name='sitename' id='sitename' type='text' size='45' value='<?php 
    echo esc_attr($site_name);
    ?>' />
					<p class="description">
						<?php 
    _e('What would you like to call your network?');
    ?>
					</p>
				</td>
			</tr>
			<tr>
				<th scope='row'><label for="email"><?php 
    esc_html_e('Network Admin Email');
    ?></label></th>
				<td>
					<input name='email' id='email' type='text' size='45' value='<?php 
    echo esc_attr($admin_email);
    ?>' />
					<p class="description">
						<?php 
    _e('Your email address.');
    ?>
					</p>
				</td>
			</tr>
		</table>
		<?php 
    submit_button(__('Install'), 'primary', 'submit');
    ?>
	</form>
	<?php 
}
function network_step2($errors = false)
{
    global $wpdb, $is_nginx;
    $hostname = get_clean_basedomain();
    $slashed_home = trailingslashit(get_option('home'));
    $base = parse_url($slashed_home, PHP_URL_PATH);
    $document_root_fix = str_replace('\\', '/', realpath($_SERVER['DOCUMENT_ROOT']));
    $abspath_fix = str_replace('\\', '/', ABSPATH);
    $home_path = 0 === strpos($abspath_fix, $document_root_fix) ? $document_root_fix . $base : get_home_path();
    $wp_siteurl_subdir = preg_replace('#^' . preg_quote($home_path, '#') . '#', '', $abspath_fix);
    $rewrite_base = !empty($wp_siteurl_subdir) ? ltrim(trailingslashit($wp_siteurl_subdir), '/') : '';
    $location_of_wp_config = $abspath_fix;
    if (!file_exists(ABSPATH . 'wp-config.php') && file_exists(dirname(ABSPATH) . '/wp-config.php')) {
        $location_of_wp_config = dirname($abspath_fix);
    }
    $location_of_wp_config = trailingslashit($location_of_wp_config);
    if (is_wp_error($errors)) {
        echo '<div class="error">' . $errors->get_error_message() . '</div>';
    }
    if ($_POST) {
        if (allow_subdomain_install()) {
            $subdomain_install = allow_subdirectory_install() ? !empty($_POST['subdomain_install']) : true;
        } else {
            $subdomain_install = false;
        }
    } else {
        if (is_multisite()) {
            $subdomain_install = is_subdomain_install();
            ?>
	<p><?php 
            _e('The original configuration steps are shown here for reference.');
            ?></p>
			<?php 
        } else {
            $subdomain_install = (bool) $wpdb->get_var("SELECT meta_value FROM {$wpdb->sitemeta} WHERE site_id = 1 AND meta_key = 'subdomain_install'");
            ?>
	<div class="error"><p><strong><?php 
            _e('Warning:');
            ?></strong> <?php 
            _e('An existing WordPress network was detected.');
            ?></p></div>
	<p><?php 
            _e('Please complete the configuration steps. To create a new network, you will need to empty or remove the network database tables.');
            ?></p>
			<?php 
        }
    }
    $subdir_match = $subdomain_install ? '' : '([_0-9a-zA-Z-]+/)?';
    $subdir_replacement_01 = $subdomain_install ? '' : '$1';
    $subdir_replacement_12 = $subdomain_install ? '$1' : '$2';
    if ($_POST || !is_multisite()) {
        ?>
		<h3><?php 
        esc_html_e('Enabling the Network');
        ?></h3>
		<p><?php 
        _e('Complete the following steps to enable the features for creating a network of sites.');
        ?></p>
		<div class="notice notice-warning inline"><p>
		<?php 
        if (file_exists($home_path . '.htaccess')) {
            echo '<strong>' . __('Caution:') . '</strong> ';
            printf(__('We recommend you back up your existing %1$s and %2$s files.'), '<code>wp-config.php</code>', '<code>.htaccess</code>');
        } elseif (file_exists($home_path . 'web.config')) {
            echo '<strong>' . __('Caution:') . '</strong> ';
            printf(__('We recommend you back up your existing %1$s and %2$s files.'), '<code>wp-config.php</code>', '<code>web.config</code>');
        } else {
            echo '<strong>' . __('Caution:') . '</strong> ';
            printf(__('We recommend you back up your existing %s file.'), '<code>wp-config.php</code>');
        }
        ?>
		</p></div>
		<?php 
    }
    ?>
	<ol>
		<li><p>
		<?php 
    printf(__('Add the following to your %1$s file in %2$s <strong>above</strong> the line reading %3$s:'), '<code>wp-config.php</code>', '<code>' . $location_of_wp_config . '</code>', '<code>/* ' . __('That&#8217;s all, stop editing! Happy publishing.') . ' */</code>');
    ?>
		</p>
		<textarea class="code" readonly="readonly" cols="100" rows="7">
define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', <?php 
    echo $subdomain_install ? 'true' : 'false';
    ?>);
define('DOMAIN_CURRENT_SITE', '<?php 
    echo $hostname;
    ?>');
define('PATH_CURRENT_SITE', '<?php 
    echo $base;
    ?>');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);
</textarea>
		<?php 
    $keys_salts = array('AUTH_KEY' => '', 'SECURE_AUTH_KEY' => '', 'LOGGED_IN_KEY' => '', 'NONCE_KEY' => '', 'AUTH_SALT' => '', 'SECURE_AUTH_SALT' => '', 'LOGGED_IN_SALT' => '', 'NONCE_SALT' => '');
    foreach ($keys_salts as $c => $v) {
        if (defined($c)) {
            unset($keys_salts[$c]);
        }
    }
    if (!empty($keys_salts)) {
        $keys_salts_str = '';
        $from_api = wp_remote_get('https://api.wordpress.org/secret-key/1.1/salt/');
        if (is_wp_error($from_api)) {
            foreach ($keys_salts as $c => $v) {
                $keys_salts_str .= "\ndefine( '{$c}', '" . wp_generate_password(64, true, true) . "' );";
            }
        } else {
            $from_api = explode("\n", wp_remote_retrieve_body($from_api));
            foreach ($keys_salts as $c => $v) {
                $keys_salts_str .= "\ndefine( '{$c}', '" . substr(array_shift($from_api), 28, 64) . "' );";
            }
        }
        $num_keys_salts = count($keys_salts);
        ?>
		<p>
			<?php 
        if (1 === $num_keys_salts) {
            printf(__('This unique authentication key is also missing from your %s file.'), '<code>wp-config.php</code>');
        } else {
            printf(__('These unique authentication keys are also missing from your %s file.'), '<code>wp-config.php</code>');
        }
        ?>
			<?php 
        _e('To make your installation more secure, you should also add:');
        ?>
		</p>
		<textarea class="code" readonly="readonly" cols="100" rows="<?php 
        echo $num_keys_salts;
        ?>"><?php 
        echo esc_textarea($keys_salts_str);
        ?></textarea>
			<?php 
    }
    ?>
		</li>
	<?php 
    if (iis7_supports_permalinks()) {
        $iis_subdir_match = ltrim($base, '/') . $subdir_match;
        $iis_rewrite_base = ltrim($base, '/') . $rewrite_base;
        $iis_subdir_replacement = $subdomain_install ? '' : '{R:1}';
        $web_config_file = '<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
            <rules>
                <rule name="WordPress Rule 1" stopProcessing="true">
                    <match url="^index\\.php$" ignoreCase="false" />
                    <action type="None" />
                </rule>';
        if (is_multisite() && get_site_option('ms_files_rewriting')) {
            $web_config_file .= '
                <rule name="WordPress Rule for Files" stopProcessing="true">
                    <match url="^' . $iis_subdir_match . 'files/(.+)" ignoreCase="false" />
                    <action type="Rewrite" url="' . $iis_rewrite_base . WPINC . '/ms-files.php?file={R:1}" appendQueryString="false" />
                </rule>';
        }
        $web_config_file .= '
                <rule name="WordPress Rule 2" stopProcessing="true">
                    <match url="^' . $iis_subdir_match . 'wp-admin$" ignoreCase="false" />
                    <action type="Redirect" url="' . $iis_subdir_replacement . 'wp-admin/" redirectType="Permanent" />
                </rule>
                <rule name="WordPress Rule 3" stopProcessing="true">
                    <match url="^" ignoreCase="false" />
                    <conditions logicalGrouping="MatchAny">
                        <add input="{REQUEST_FILENAME}" matchType="IsFile" ignoreCase="false" />
                        <add input="{REQUEST_FILENAME}" matchType="IsDirectory" ignoreCase="false" />
                    </conditions>
                    <action type="None" />
                </rule>
                <rule name="WordPress Rule 4" stopProcessing="true">
                    <match url="^' . $iis_subdir_match . '(wp-(content|admin|includes).*)" ignoreCase="false" />
                    <action type="Rewrite" url="' . $iis_rewrite_base . '{R:1}" />
                </rule>
                <rule name="WordPress Rule 5" stopProcessing="true">
                    <match url="^' . $iis_subdir_match . '([_0-9a-zA-Z-]+/)?(.*\\.php)$" ignoreCase="false" />
                    <action type="Rewrite" url="' . $iis_rewrite_base . '{R:2}" />
                </rule>
                <rule name="WordPress Rule 6" stopProcessing="true">
                    <match url="." ignoreCase="false" />
                    <action type="Rewrite" url="index.php" />
                </rule>
            </rules>
        </rewrite>
    </system.webServer>
</configuration>
';
        echo '<li><p>';
        printf(__('Add the following to your %1$s file in %2$s, <strong>replacing</strong> other WordPress rules:'), '<code>web.config</code>', '<code>' . $home_path . '</code>');
        echo '</p>';
        if (!$subdomain_install && WP_CONTENT_DIR !== ABSPATH . 'wp-content') {
            echo '<p><strong>' . __('Warning:') . ' ' . __('Subdirectory networks may not be fully compatible with custom wp-content directories.') . '</strong></p>';
        }
        ?>
		<textarea class="code" readonly="readonly" cols="100" rows="20"><?php 
        echo esc_textarea($web_config_file);
        ?></textarea>
		</li>
	</ol>

		<?php 
    } elseif ($is_nginx) {
        echo '<li><p>';
        printf(__('It seems your network is running with Nginx web server. <a href="%s">Learn more about further configuration</a>.'), __('https://wordpress.org/support/article/nginx/'));
        echo '</p></li>';
    } else {
        $ms_files_rewriting = '';
        if (is_multisite() && get_site_option('ms_files_rewriting')) {
            $ms_files_rewriting = "\n# uploaded files\nRewriteRule ^";
            $ms_files_rewriting .= $subdir_match . "files/(.+) {$rewrite_base}" . WPINC . "/ms-files.php?file={$subdir_replacement_12} [L]" . "\n";
        }
        $htaccess_file = <<<EOF
RewriteEngine On
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
RewriteBase {$base}
RewriteRule ^index\\.php\$ - [L]
{$ms_files_rewriting}
# add a trailing slash to /wp-admin
RewriteRule ^{$subdir_match}wp-admin\$ {$subdir_replacement_01}wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^{$subdir_match}(wp-(content|admin|includes).*) {$rewrite_base}{$subdir_replacement_12} [L]
RewriteRule ^{$subdir_match}(.*\\.php)\$ {$rewrite_base}{$subdir_replacement_12} [L]
RewriteRule . index.php [L]

EOF;
        echo '<li><p>';
        printf(__('Add the following to your %1$s file in %2$s, <strong>replacing</strong> other WordPress rules:'), '<code>.htaccess</code>', '<code>' . $home_path . '</code>');
        echo '</p>';
        if (!$subdomain_install && WP_CONTENT_DIR !== ABSPATH . 'wp-content') {
            echo '<p><strong>' . __('Warning:') . ' ' . __('Subdirectory networks may not be fully compatible with custom wp-content directories.') . '</strong></p>';
        }
        ?>
		<textarea class="code" readonly="readonly" cols="100" rows="<?php 
        echo substr_count($htaccess_file, "\n") + 1;
        ?>"><?php 
        echo esc_textarea($htaccess_file);
        ?></textarea>
		</li>
	</ol>

		<?php 
    }
    if (!is_multisite()) {
        ?>
		<p><?php 
        _e('Once you complete these steps, your network is enabled and configured. You will have to log in again.');
        ?> <a href="<?php 
        echo esc_url(wp_login_url());
        ?>"><?php 
        _e('Log In');
        ?></a></p>
		<?php 
    }
}