GH#1716: optimize front-end My Sites toolbar

inc/class-settings.php

@@ -1409,6 +1409,17 @@ public function default_sections(): void {
 			]
 		);
 
+		$this->add_field(
+			'sites',
+			'optimize_frontend_my_sites_toolbar',
+			[
+				'title'   => __('Optimize the front-end My Sites toolbar', 'ultimate-multisite'),
+				'desc'    => __('Show only the current site in the front-end toolbar to reduce processing on large networks. The complete site list remains available from the My Sites administration page.', 'ultimate-multisite'),
+				'type'    => 'toggle',
+				'default' => 0,
+			]
+		);
+
 		$this->add_field(
 			'sites',
 			'wordpress_features_heading',
@@ -2177,6 +2188,7 @@ public static function get_setting_defaults(): array {
 			// Sites
 			'enable_visits_limiting'             => 1,
 			'enable_screenshot_generator'        => 1,
+			'optimize_frontend_my_sites_toolbar' => 0,
 			'menu_items_plugin'                  => 1,
 			'add_new_users'                      => 1,
 			'allow_template_switching'           => 1,

inc/managers/class-site-manager.php

@@ -1163,6 +1163,12 @@ public function hide_customer_sites_from_super_admin_list($sites, $user_id, $all
 			return $sites;
 		}
 
+		if ($this->is_frontend_my_sites_toolbar_request()) {
+			$sites = $this->get_current_site_for_frontend_my_sites_toolbar();
+
+			return apply_filters('get_blogs_of_user', $sites, $user_id, $all); // phpcs:ignore
+		}
+
 		$keys = get_user_meta($user_id);
 
 		if (empty($keys)) {
@@ -1271,6 +1277,74 @@ public function hide_customer_sites_from_super_admin_list($sites, $user_id, $all
 		return apply_filters('get_blogs_of_user', $sites, $user_id, $all); // phpcs:ignore
 	}
 
+	/**
+	 * Determines whether get_blogs_of_user is preparing the front-end My Sites toolbar.
+	 *
+	 * The pre_get_blogs_of_user filter is also used by wp-admin, REST requests, and
+	 * application code. Checking the WP_Admin_Bar initialization call keeps the
+	 * optimization limited to the nested toolbar request instead of limiting every
+	 * front-end get_blogs_of_user() call.
+	 *
+	 * @since 2.15.0
+	 * @param array|null $backtrace Call stack override used by tests.
+	 * @return bool
+	 */
+	protected function is_frontend_my_sites_toolbar_request($backtrace = null) {
+
+		if (
+			! wu_get_setting('optimize_frontend_my_sites_toolbar', false)
+			|| is_admin()
+			|| wp_doing_ajax()
+			|| wp_doing_cron()
+			|| (defined('REST_REQUEST') && REST_REQUEST)
+			|| (defined('WP_CLI') && WP_CLI)
+			|| ! is_user_logged_in()
+			|| ! is_admin_bar_showing()
+		) {
+			return false;
+		}
+
+		$backtrace = $backtrace ?? debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 12); // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_debug_backtrace
+
+		foreach ($backtrace as $call) {
+			if ('WP_Admin_Bar' === ($call['class'] ?? '') && 'initialize' === ($call['function'] ?? '')) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	/**
+	 * Returns the current site in the format expected by the My Sites toolbar.
+	 *
+	 * @since 2.15.0
+	 * @return object[]
+	 */
+	protected function get_current_site_for_frontend_my_sites_toolbar() {
+
+		$site = get_site(get_current_blog_id());
+
+		if ( ! $site) {
+			return [];
+		}
+
+		return [
+			$site->id => (object) [
+				'userblog_id' => $site->id,
+				'blogname'    => $site->blogname,
+				'domain'      => $site->domain,
+				'path'        => $site->path,
+				'site_id'     => $site->network_id,
+				'siteurl'     => $site->siteurl,
+				'archived'    => $site->archived,
+				'mature'      => $site->mature,
+				'spam'        => $site->spam,
+				'deleted'     => $site->deleted,
+			],
+		];
+	}
+
 	/**
 	 * Delete pending sites from non-pending memberships
 	 *

tests/WP_Ultimo/Managers/Site_Manager_Test.php

@@ -9,6 +9,17 @@
 
 use WP_Ultimo\Managers\Site_Manager;
 
+// phpcs:disable Generic.Files.OneObjectStructurePerFile.MultipleFound
+class Frontend_My_Sites_Toolbar_Test_Manager extends Site_Manager {
+
+	protected function is_frontend_my_sites_toolbar_request($backtrace = null) {
+
+		return true;
+	}
+}
+// phpcs:enable Generic.Files.OneObjectStructurePerFile.MultipleFound
+
+// phpcs:ignore Generic.Files.OneObjectStructurePerFile.MultipleFound
 class Site_Manager_Test extends \WP_UnitTestCase {
 
 	use Manager_Test_Trait;
@@ -511,7 +522,7 @@
 
 		wu_save_setting('search_and_replace', []);
 
 		add_filter('wu_search_and_replace_on_duplication', function ($settings, $from, $to) {
 			$settings['filter-key'] = 'filter-value';
 			return $settings;
 		}, 10, 3);
@@ -2943,7 +2954,7 @@
 
 		$filter_applied = false;
 
 		add_filter('get_blogs_of_user', function ($sites, $uid, $all) use (&$filter_applied) {
 			$filter_applied = true;
 			return $sites;
 		}, 10, 3);
@@ -2958,6 +2969,112 @@
 		wp_set_current_user(0);
 	}
 
+	/**
+	 * Test the front-end My Sites toolbar optimization applies get_blogs_of_user filter.
+	 */
+	public function test_frontend_my_sites_toolbar_optimization_applies_get_blogs_of_user_filter(): void {
+
+		$reflection = new \ReflectionClass(Frontend_My_Sites_Toolbar_Test_Manager::class);
+		$manager    = $reflection->newInstanceWithoutConstructor();
+		$user_id    = $this->factory()->user->create(['role' => 'administrator']);
+		$filter     = function ($sites, $filter_user_id, $all) {
+
+			unset($all);
+			$sites['filtered'] = (object) ['userblog_id' => $filter_user_id];
+
+			return $sites;
+		};
+
+		grant_super_admin($user_id);
+		wp_set_current_user($user_id);
+		add_filter('get_blogs_of_user', $filter, 10, 3);
+
+		try {
+			$sites = $manager->hide_customer_sites_from_super_admin_list([], $user_id, false);
+
+			$this->assertArrayHasKey('filtered', $sites);
+			$this->assertSame($user_id, $sites['filtered']->userblog_id);
+		} finally {
+			remove_filter('get_blogs_of_user', $filter, 10);
+			revoke_super_admin($user_id);
+			wp_set_current_user(0);
+		}
+	}
+
+	/**
+	 * Test front-end My Sites toolbar optimization requires the admin bar call stack.
+	 */
+	public function test_frontend_my_sites_toolbar_optimization_requires_admin_bar_initialization(): void {
+
+		$manager = $this->get_manager_instance();
+		$user_id = $this->factory()->user->create(['role' => 'administrator']);
+		$method  = new \ReflectionMethod(Site_Manager::class, 'is_frontend_my_sites_toolbar_request');
+		$filter  = function ($value, $setting) {
+			return 'optimize_frontend_my_sites_toolbar' === $setting ? 1 : $value;
+		};
+
+		wp_set_current_user($user_id);
+		add_filter('wu_get_setting', $filter, 10, 2);
+		add_filter('show_admin_bar', '__return_true');
+
+		try {
+			$this->assertTrue(
+				$method->invoke($manager, [
+					[
+						'class'    => 'WP_Admin_Bar',
+						'function' => 'initialize',
+					],
+				])
+			);
+			$this->assertFalse($method->invoke($manager, []));
+		} finally {
+			remove_filter('wu_get_setting', $filter, 10);
+			remove_filter('show_admin_bar', '__return_true');
+			wp_set_current_user(0);
+		}
+	}
+
+	/**
+	 * Test front-end My Sites toolbar optimization remains disabled by default.
+	 */
+	public function test_frontend_my_sites_toolbar_optimization_is_disabled_by_default(): void {
+
+		$manager = $this->get_manager_instance();
+		$user_id = $this->factory()->user->create(['role' => 'administrator']);
+		$method  = new \ReflectionMethod(Site_Manager::class, 'is_frontend_my_sites_toolbar_request');
+
+		wp_set_current_user($user_id);
+		add_filter('show_admin_bar', '__return_true');
+
+		try {
+			$this->assertFalse(
+				$method->invoke($manager, [
+					[
+						'class'    => 'WP_Admin_Bar',
+						'function' => 'initialize',
+					],
+				])
+			);
+		} finally {
+			remove_filter('show_admin_bar', '__return_true');
+			wp_set_current_user(0);
+		}
+	}
+
+	/**
+	 * Test the toolbar optimization supplies only the active site.
+	 */
+	public function test_frontend_my_sites_toolbar_optimization_returns_current_site_only(): void {
+
+		$manager = $this->get_manager_instance();
+		$method  = new \ReflectionMethod(Site_Manager::class, 'get_current_site_for_frontend_my_sites_toolbar');
+		$sites   = $method->invoke($manager);
+
+		$this->assertCount(1, $sites);
+		$this->assertArrayHasKey(get_current_blog_id(), $sites);
+		$this->assertSame(get_current_blog_id(), $sites[ get_current_blog_id() ]->userblog_id);
+	}
+
 	// ========================================================================
 	// init – demo-related hooks
 	// ========================================================================
@@ -3547,7 +3664,7 @@
 		wu_save_setting('network_logo', 'https://example.com/logo.png');
 
 		// Register the 'login' style so wp_add_inline_style doesn't fail.
 		wp_register_style('login', false);
 
 		$manager = $this->get_manager_instance();
 
@@ -3798,7 +3915,7 @@
 
 		$filter_applied = false;
 
 		add_filter('wu_demo_go_live_url', function ($url, $site) use (&$filter_applied) {
 			$filter_applied = true;
 			return $url;
 		}, 10, 2);

tests/WP_Ultimo/Settings_Test.php

@@ -396,6 +396,21 @@ public function test_get_setting_defaults_disables_passwordless_login() {
 		$this->assertSame(0, $defaults['use_passwordless_login']);
 	}
 
+	public function test_get_setting_defaults_disables_frontend_my_sites_toolbar_optimization() {
+		$defaults = Settings::get_setting_defaults();
+		$this->assertArrayHasKey('optimize_frontend_my_sites_toolbar', $defaults);
+		$this->assertSame(0, $defaults['optimize_frontend_my_sites_toolbar']);
+	}
+
+	public function test_sites_section_has_frontend_my_sites_toolbar_optimization_field() {
+		$section = $this->settings->get_section('sites');
+		$field   = $section['fields']['optimize_frontend_my_sites_toolbar'];
+
+		$this->assertSame('toggle', $field['type']);
+		$this->assertSame(0, $field['default']);
+		$this->assertStringContainsString('My Sites administration page', $field['desc']);
+	}
+
 	// ------------------------------------------------------------------
 	// General section fields
 	// ------------------------------------------------------------------