<?php
/**
* These functions are needed to load Multisite.
*
* @since 3.0.0
*
* @package WordPress
* @subpackage Multisite
*/

/**
* Whether a subdomain configuration is enabled.
*
* @since 3.0.0
*
* @return bool True if subdomain configuration is enabled, false otherwise.
*/
function is_subdomain_install() {
if ( defined( 'SUBDOMAIN_INSTALL' ) ) {
return SUBDOMAIN_INSTALL;
}

return ( defined( 'VHOST' ) && 'yes' === VHOST );
}

/**
* Returns array of network plugin files to be included in global scope.
*
* The default directory is wp-content/plugins. To change the default directory
* manually, define `WP_PLUGIN_DIR` and `WP_PLUGIN_URL` in `wp-config.php`.
*
* @access private
* @since 3.1.0
*
* @return string[] Array of absolute paths to files to include.
*/
function wp_get_active_network_plugins() {
$active_plugins = (array) get_site_option( 'active_sitewide_plugins', array() );
if ( empty( $active_plugins ) ) {
return array();
}

$plugins = array();
$active_plugins = array_keys( $active_plugins );
sort( $active_plugins );

foreach ( $active_plugins as $plugin ) {
if ( ! validate_file( $plugin ) // $plugin must validate as file.
&& str_ends_with( $plugin, '.php' ) // $plugin must end with '.php'.
&& file_exists( WP_PLUGIN_DIR . '/' . $plugin ) // $plugin must exist.
) {
$plugins[] = WP_PLUGIN_DIR . '/' . $plugin;
}
}

return $plugins;
}

/**
* Checks status of current blog.
*
* Checks if the blog is deleted, inactive, archived, or spammed.
*
* Dies with a default message if the blog does not pass the check.
*
* To change the default message when a blog does not pass the check,
* use the wp-content/blog-deleted.php, blog-inactive.php and
* blog-suspended.php drop-ins.
*
* @since 3.0.0
*
* @return true|string Returns true on success, or drop-in file to include.
*/
function ms_site_check() {

/**
* Filters checking the status of the current blog.
*
* @since 3.0.0
*
* @param bool|null $check Whether to skip the blog status check. Default null.
*/
$check = apply_filters( 'ms_site_check', null );
if ( null !== $check ) {
return true;
}

// Allow super admins to see blocked sites.
if ( is_super_admin() ) {
return true;
}

$blog = get_site();

if ( '1' === $blog->deleted ) {
if ( file_exists( WP_CONTENT_DIR . '/blog-deleted.php' ) ) {
return WP_CONTENT_DIR . '/blog-deleted.php';
} else {
wp_die( __( 'This site is no longer available.' ), '', array( 'response' => 410 ) );
}
}

if ( '2' === $blog->deleted ) {
if ( file_exists( WP_CONTENT_DIR . '/blog-inactive.php' ) ) {
return WP_CONTENT_DIR . '/blog-inactive.php';
} else {
$admin_email = str_replace( '@', ' AT ', get_site_option( 'admin_email', 'support@' . get_network()->domain ) );
wp_die(
sprintf(
/* translators: %s: Admin email link. */
__( 'This site has not been activated yet. If you are having problems activating your site, please contact %s.' ),
sprintf( '<a href="mailto:%1$s">%1$s</a>', $admin_email )
)
);
}
}

if ( '1' === $blog->archived || '1' === $blog->spam ) {
if ( file_exists( WP_CONTENT_DIR . '/blog-suspended.php' ) ) {
return WP_CONTENT_DIR . '/blog-suspended.php';
} else {
wp_die( __( 'This site has been archived or suspended.' ), '', array( 'response' => 410 ) );
}
}

return true;
}

/**
* Retrieves the closest matching network for a domain and path.
*
* @since 3.9.0
*
* @internal In 4.4.0, converted to a wrapper for WP_Network::get_by_path()
*
* @param string $domain Domain to check.
* @param string $path Path to check.
* @param int|null $segments Path segments to use. Defaults to null, or the full path.
* @return WP_Network|false Network object if successful. False when no network is found.
*/
function get_network_by_path( $domain, $path, $segments = null ) {
return WP_Network::get_by_path( $domain, $path, $segments );
}

/**
* Retrieves the closest matching site object by its domain and path.
*
* This will not necessarily return an exact match for a domain and path. Instead, it
* breaks the domain and path into pieces that are then used to match the closest
* possibility from a query.
*
* The intent of this method is to match a site object during bootstrap for a
* requested site address
*
* @since 3.9.0
* @since 4.7.0 Updated to always return a `WP_Site` object.
*
* @param string $domain Domain to check.
* @param string $path Path to check.
* @param int|null $segments Path segments to use. Defaults to null, or the full path.
* @return WP_Site|false Site object if successful. False when no site is found.
*/
function get_site_by_path( $domain, $path, $segments = null ) {
$path_segments = array_filter( explode( '/', trim( $path, '/' ) ) );

/**
* Filters the number of path segments to consider when searching for a site.
*
* @since 3.9.0
*
* @param int|null $segments The number of path segments to consider. WordPress by default looks at
* one path segment following the network path. The function default of
* null only makes sense when you know the requested path should match a site.
* @param string $domain The requested domain.
* @param string $path The requested path, in full.
*/
$segments = apply_filters( 'site_by_path_segments_count', $segments, $domain, $path );

if ( null !== $segments && count( $path_segments ) > $segments ) {
$path_segments = array_slice( $path_segments, 0, $segments );
}

$paths = array();

while ( count( $path_segments ) ) {
$paths[] = '/' . implode( '/', $path_segments ) . '/';
array_pop( $path_segments );
}

$paths[] = '/';

/**
* Determines a site by its domain and path.
*
* This allows one to short-circuit the default logic, perhaps by
* replacing it with a routine that is more optimal for your setup.
*
* Return null to avoid the short-circuit. Return false if no site
* can be found at the requested domain and path. Otherwise, return
* a site object.
*
* @since 3.9.0
*
* @param null|false|WP_Site $site Site value to return by path. Default null
* to continue retrieving the site.
* @param string $domain The requested domain.
* @param string $path The requested path, in full.
* @param int|null $segments The suggested number of paths to consult.
* Default null, meaning the entire path was to be consulted.
* @param string[] $paths The paths to search for, based on $path and $segments.
*/
$pre = apply_filters( 'pre_get_site_by_path', null, $domain, $path, $segments, $paths );
if ( null !== $pre ) {
if ( false !== $pre && ! $pre instanceof WP_Site ) {
$pre = new WP_Site( $pre );
}
return $pre;
}

/*
* @todo
* Caching, etc. Consider alternative optimization routes,
* perhaps as an opt-in for plugins, rather than using the pre_* filter.
* For example: The segments filter can expand or ignore paths.
* If persistent caching is enabled, we could query the DB for a path <> '/'
* then cache whether we can just always ignore paths.
*/

/*
* Either www or non-www is supported, not both. If a www domain is requested,
* query for both to provide the proper redirect.
*/
$domains = array( $domain );
if ( str_starts_with( $domain, 'www.' ) ) {
$domains[] = substr( $domain, 4 );
}

$args = array(
'number' => 1,
'update_site_meta_cache' => false,
);

if ( count( $domains ) > 1 ) {
$args['domain__in'] = $domains;
$args['orderby']['domain_length'] = 'DESC';
} else {
$args['domain'] = array_shift( $domains );
}

if ( count( $paths ) > 1 ) {
$args['path__in'] = $paths;
$args['orderby']['path_length'] = 'DESC';
} else {
$args['path'] = array_shift( $paths );
}

$result = get_sites( $args );
$site = array_shift( $result );

if ( $site ) {
return $site;
}

return false;
}

/**
* Identifies the network and site of a requested domain and path and populates the
* corresponding network and site global objects as part of the multisite bootstrap process.
*
* Prior to 4.6.0, this was a procedural block in `ms-settings.php`. It was wrapped into
* a function to facilitate unit tests. It should not be used outside of core.
*
* Usually, it's easier to query the site first, which then declares its network.
* In limited situations, we either can or must find the network first.
*
* If a network and site are found, a `true` response will be returned so that the
* request can continue.
*
* If neither a network or site is found, `false` or a URL string will be returned
* so that either an error can be shown or a redirect can occur.
*
* @since 4.6.0
* @access private
*
* @global WP_Network $current_site The current network.
* @global WP_Site $current_blog The current site.
*
* @param string $domain The requested domain.
* @param string $path The requested path.
* @param bool $subdomain Optional. Whether a subdomain (true) or subdirectory (false) configuration.
* Default false.
* @return bool|string True if bootstrap successfully populated `$current_blog` and `$current_site`.
* False if bootstrap could not be properly completed.
* Redirect URL if parts exist, but the request as a whole can not be fulfilled.
*/
function ms_load_current_site_and_network( $domain, $path, $subdomain = false ) {
global $current_site, $current_blog;

// If the network is defined in wp-config.php, we can simply use that.
if ( defined( 'DOMAIN_CURRENT_SITE' ) && defined( 'PATH_CURRENT_SITE' ) ) {
$current_site = new stdClass();
$current_site->id = defined( 'SITE_ID_CURRENT_SITE' ) ? SITE_ID_CURRENT_SITE : 1;
$current_site->domain = DOMAIN_CURRENT_SITE;
$current_site->path = PATH_CURRENT_SITE;
if ( defined( 'BLOG_ID_CURRENT_SITE' ) ) {
$current_site->blog_id = BLOG_ID_CURRENT_SITE;
} elseif ( defined( 'BLOGID_CURRENT_SITE' ) ) { // Deprecated.
$current_site->blog_id = BLOGID_CURRENT_SITE;
}

if ( 0 === strcasecmp( $current_site->domain, $domain ) && 0 === strcasecmp( $current_site->path, $path ) ) {
$current_blog = get_site_by_path( $domain, $path );
} elseif ( '/' !== $current_site->path && 0 === strcasecmp( $current_site->domain, $domain ) && 0 === stripos( $path, $current_site->path ) ) {
/*
* If the current network has a path and also matches the domain and path of the request,
* we need to look for a site using the first path segment following the network's path.
*/
$current_blog = get_site_by_path( $domain, $path, 1 + count( explode( '/', trim( $current_site->path, '/' ) ) ) );
} else {
// Otherwise, use the first path segment (as usual).
$current_blog = get_site_by_path( $domain, $path, 1 );
}
} elseif ( ! $subdomain ) {
/*
* A "subdomain" installation can be re-interpreted to mean "can support any domain".
* If we're not dealing with one of these installations, then the important part is determining
* the network first, because we need the network's path to identify any sites.
*/
$current_site = wp_cache_get( 'current_network', 'site-options' );
if ( ! $current_site ) {
// Are there even two networks installed?
$networks = get_networks( array( 'number' => 2 ) );
if ( count( $networks ) === 1 ) {
$current_site = array_shift( $networks );
wp_cache_add( 'current_network', $current_site, 'site-options' );
} elseif ( empty( $networks ) ) {
// A network not found hook should fire here.
return false;
}
}

if ( empty( $current_site ) ) {
$current_site = WP_Network::get_by_path( $domain, $path, 1 );
}

if ( empty( $current_site ) ) {
/**
* Fires when a network cannot be found based on the requested domain and path.
*
* At the time of this action, the only recourse is to redirect somewhere
* and exit. If you want to declare a particular network, do so earlier.
*
* @since 4.4.0
*
* @param string $domain The domain used to search for a network.
* @param string $path The path used to search for a path.
*/
do_action( 'ms_network_not_found', $domain, $path );

return false;
} elseif ( $path === $current_site->path ) {
$current_blog = get_site_by_path( $domain, $path );
} else {
// Search the network path + one more path segment (on top of the network path).
$current_blog = get_site_by_path( $domain, $path, substr_count( $current_site->path, '/' ) );
}
} else {
// Find the site by the domain and at most the first path segment.
$current_blog = get_site_by_path( $domain, $path, 1 );
if ( $current_blog ) {
$current_site = WP_Network::get_instance( $current_blog->site_id ? $current_blog->site_id : 1 );
} else {
// If you don't have a site with the same domain/path as a network, you're pretty screwed, but:
$current_site = WP_Network::get_by_path( $domain, $path, 1 );
}
}

// The network declared by the site trumps any constants.
if ( $current_blog && (int) $current_blog->site_id !== $current_site->id ) {
$current_site = WP_Network::get_instance( $current_blog->site_id );
}

// No network has been found, bail.
if ( empty( $current_site ) ) {
/** This action is documented in wp-includes/ms-settings.php */
do_action( 'ms_network_not_found', $domain, $path );

return false;
}

// During activation of a new subdomain, the requested site does not yet exist.
if ( empty( $current_blog ) && wp_installing() ) {
$current_blog = new stdClass();
$current_blog->blog_id = 1;
$blog_id = 1;
$current_blog->public = 1;
}

// No site has been found, bail.
if ( empty( $current_blog ) ) {
// We're going to redirect to the network URL, with some possible modifications.
$scheme = is_ssl() ? 'https' : 'http';
$destination = "$scheme://{$current_site->domain}{$current_site->path}";

/**
* Fires when a network can be determined but a site cannot.
*
* At the time of this action, the only recourse is to redirect somewhere
* and exit. If you want to declare a particular site, do so earlier.
*
* @since 3.9.0
*
* @param WP_Network $current_site The network that had been determined.
* @param string $domain The domain used to search for a site.
* @param string $path The path used to search for a site.
*/
do_action( 'ms_site_not_found', $current_site, $domain, $path );

if ( $subdomain && ! defined( 'NOBLOGREDIRECT' ) ) {
// For a "subdomain" installation, redirect to the signup form specifically.
$destination .= 'wp-signup.php?new=' . str_replace( '.' . $current_site->domain, '', $domain );
} elseif ( $subdomain ) {
/*
* For a "subdomain" installation, the NOBLOGREDIRECT constant
* can be used to avoid a redirect to the signup form.
* Using the ms_site_not_found action is preferred to the constant.
*/
if ( '%siteurl%' !== NOBLOGREDIRECT ) {
$destination = NOBLOGREDIRECT;
}
} elseif ( 0 === strcasecmp( $current_site->domain, $domain ) ) {
/*
* If the domain we were searching for matches the network's domain,
* it's no use redirecting back to ourselves -- it'll cause a loop.
* As we couldn't find a site, we're simply not installed.
*/
return false;
}

return $destination;
}

// Figure out the current network's main site.
if ( empty( $current_site->blog_id ) ) {
$current_site->blog_id = get_main_site_id( $current_site->id );
}

return true;
}

/**
* Displays a failure message.
*
* Used when a blog's tables do not exist. Checks for a missing $wpdb->site table as well.
*
* @access private
* @since 3.0.0
* @since 4.4.0 The `$domain` and `$path` parameters were added.
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param string $domain The requested domain for the error to reference.
* @param string $path The requested path for the error to reference.
*/
function ms_not_installed( $domain, $path ) {
global $wpdb;

if ( ! is_admin() ) {
dead_db();
}

wp_load_translations_early();

$title = __( 'Error establishing a database connection' );

$msg = '<h1>' . $title . '</h1>';
$msg .= '<p>' . __( 'If your site does not display, please contact the owner of this network.' ) . '';
$msg .= ' ' . __( 'If you are the owner of this network please check that your host&#8217;s database server is running properly and all tables are error free.' ) . '</p>';
$query = $wpdb->prepare( 'SHOW TABLES LIKE %s', $wpdb->esc_like( $wpdb->site ) );
if ( ! $wpdb->get_var( $query ) ) {
$msg .= '<p>' . sprintf(
/* translators: %s: Table name. */
__( '<strong>Database tables are missing.</strong> This means that your host&#8217;s database server is not running, WordPress was not installed properly, or someone deleted %s. You really should look at your database now.' ),
'<code>' . $wpdb->site . '</code>'
) . '</p>';
} else {
$msg .= '<p>' . sprintf(
/* translators: 1: Site URL, 2: Table name, 3: Database name. */
__( '<strong>Could not find site %1$s.</strong> Searched for table %2$s in database %3$s. Is that right?' ),
'<code>' . rtrim( $domain . $path, '/' ) . '</code>',
'<code>' . $wpdb->blogs . '</code>',
'<code>' . DB_NAME . '</code>'
) . '</p>';
}
$msg .= '<p><strong>' . __( 'What do I do now?' ) . '</strong> ';
$msg .= sprintf(
/* translators: %s: Documentation URL. */
__( 'Read the <a href="%s" target="_blank">Debugging a WordPress Network</a> article. Some of the suggestions there may help you figure out what went wrong.' ),
__( 'https://developer.wordpress.org/advanced-administration/debug/debug-network/' )
);
$msg .= ' ' . __( 'If you are still stuck with this message, then check that your database contains the following tables:' ) . '</p><ul>';
foreach ( $wpdb->tables( 'global' ) as $t => $table ) {
if ( 'sitecategories' === $t ) {
continue;
}
$msg .= '<li>' . $table . '</li>';
}
$msg .= '</ul>';

wp_die( $msg, $title, array( 'response' => 500 ) );
}

/**
* This deprecated function formerly set the site_name property of the $current_site object.
*
* This function simply returns the object, as before.
* The bootstrap takes care of setting site_name.
*
* @access private
* @since 3.0.0
* @deprecated 3.9.0 Use get_current_site() instead.
*
* @param WP_Network $current_site
* @return WP_Network
*/
function get_current_site_name( $current_site ) {
_deprecated_function( __FUNCTION__, '3.9.0', 'get_current_site()' );
return $current_site;
}

/**
* This deprecated function managed much of the site and network loading in multisite.
*
* The current bootstrap code is now responsible for parsing the site and network load as
* well as setting the global $current_site object.
*
* @access private
* @since 3.0.0
* @deprecated 3.9.0
*
* @global WP_Network $current_site
*
* @return WP_Network
*/
function wpmu_current_site() {
global $current_site;
_deprecated_function( __FUNCTION__, '3.9.0' );
return $current_site;
}

/**
* Retrieves an object containing information about the requested network.
*
* @since 3.9.0
* @deprecated 4.7.0 Use get_network()
* @see get_network()
*
* @internal In 4.6.0, converted to use get_network()
*
* @param object|int $network The network's database row or ID.
* @return WP_Network|false Object containing network information if found, false if not.
*/
function wp_get_network( $network ) {
_deprecated_function( __FUNCTION__, '4.7.0', 'get_network()' );

$network = get_network( $network );
if ( null === $network ) {
return false;
}

return $network;
}