Multisite: Introduce a site initialization and uninitialization API.

This changeset makes the new CRUD API for sites introduced in [43548] usable for real-world sites. A new function `wp_initialize_site()`, which takes care of creating a site's database tables and populating them with initial values, is hooked into the site insertion process that is initiated when calling `wp_insert_site()`. Similarly, a new function `wp_uninitialize_site()`, which takes care of dropping a site's database tables, is hooked into the site deletion process that is initiated when calling `wp_delete_site()`.

A new function `wp_is_site_initialized()` completes the API, allowing to check whether a site is initialized. Since this function always makes a database request in its default behavior, it should be called with caution. Plugins that would like to use site initialization in special ways can leverage a `pre_wp_is_site_initialized` filter to alter that default behavior.

The separate handling of the site's row in the `wp_blogs` database table and the actual site setup allows for more flexibility in controlling whether or how a site's data is set up. For example, a unit test that only checks data from the site's database table row can unhook the site initialization process to improve performance. At the same time, developers consuming the new sites API only need to know about the CRUD functions, since the initialization and uninitialization processes happen internally.

With this changeset, the foundation for a sites REST API endpoint is fully available. The previously recommended functions `wpmu_create_blog()` and `wpmu_delete_blog()` now call the new respective function internally. Further follow-up work to this includes replacing calls to `wpmu_create_blog()` with `wp_insert_site()`, `update_blog_details()` with `wp_update_site()` and `wpmu_delete_blog()` with `wp_delete_blog()` throughout the codebase.

As a side-effect of this work, the `wpmu_new_blog`, `delete_blog`, and `deleted_blog` actions and the `install_blog()` function have been deprecated.

Fixes #41333. See #40364.


git-svn-id: https://develop.svn.wordpress.org/trunk@43654 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/ms-deprecated.php

@@ -580,3 +580,103 @@ function insert_blog($domain, $path, $site_id) {
 
 	return $site_id;
 }
+
+/**
+ * Install an empty blog.
+ *
+ * Creates the new blog tables and options. If calling this function
+ * directly, be sure to use switch_to_blog() first, so that $wpdb
+ * points to the new blog.
+ *
+ * @since MU (3.0.0)
+ * @deprecated 5.0.0
+ *
+ * @global wpdb     $wpdb
+ * @global WP_Roles $wp_roles
+ *
+ * @param int    $blog_id    The value returned by wp_insert_site().
+ * @param string $blog_title The title of the new site.
+ */
+function install_blog( $blog_id, $blog_title = '' ) {
+	global $wpdb, $wp_roles;
+
+	_deprecated_function( __FUNCTION__, '5.0.0' );
+
+	// Cast for security
+	$blog_id = (int) $blog_id;
+
+	require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
+
+	$suppress = $wpdb->suppress_errors();
+	if ( $wpdb->get_results( "DESCRIBE {$wpdb->posts}" ) ) {
+		die( '<h1>' . __( 'Already Installed' ) . '</h1><p>' . __( 'You appear to have already installed WordPress. To reinstall please clear your old database tables first.' ) . '</p></body></html>' );
+	}
+	$wpdb->suppress_errors( $suppress );
+
+	$url = get_blogaddress_by_id( $blog_id );
+
+	// Set everything up
+	make_db_current_silent( 'blog' );
+	populate_options();
+	populate_roles();
+
+	// populate_roles() clears previous role definitions so we start over.
+	$wp_roles = new WP_Roles();
+
+	$siteurl = $home = untrailingslashit( $url );
+
+	if ( ! is_subdomain_install() ) {
+
+		if ( 'https' === parse_url( get_site_option( 'siteurl' ), PHP_URL_SCHEME ) ) {
+			$siteurl = set_url_scheme( $siteurl, 'https' );
+		}
+		if ( 'https' === parse_url( get_home_url( get_network()->site_id ), PHP_URL_SCHEME ) ) {
+			$home = set_url_scheme( $home, 'https' );
+		}
+	}
+
+	update_option( 'siteurl', $siteurl );
+	update_option( 'home', $home );
+
+	if ( get_site_option( 'ms_files_rewriting' ) ) {
+		update_option( 'upload_path', UPLOADBLOGSDIR . "/$blog_id/files" );
+	} else {
+		update_option( 'upload_path', get_blog_option( get_network()->site_id, 'upload_path' ) );
+	}
+
+	update_option( 'blogname', wp_unslash( $blog_title ) );
+	update_option( 'admin_email', '' );
+
+	// remove all perms
+	$table_prefix = $wpdb->get_blog_prefix();
+	delete_metadata( 'user', 0, $table_prefix . 'user_level', null, true ); // delete all
+	delete_metadata( 'user', 0, $table_prefix . 'capabilities', null, true ); // delete all
+}
+
+/**
+ * Set blog defaults.
+ *
+ * This function creates a row in the wp_blogs table.
+ *
+ * @since MU (3.0.0)
+ * @deprecated MU
+ * @deprecated Use wp_install_defaults()
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int $blog_id Ignored in this function.
+ * @param int $user_id
+ */
+function install_blog_defaults( $blog_id, $user_id ) {
+	global $wpdb;
+
+	_deprecated_function( __FUNCTION__, 'MU' );
+
+	require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
+
+	$suppress = $wpdb->suppress_errors();
+
+	wp_install_defaults( $user_id );
+
+	$wpdb->suppress_errors( $suppress );
+}