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wp-content/plugins/jetpack/_inc/site-switcher.php

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+<?php
+/**
+ * Site Switcher for Command Palette
+ * Enqueues the site switcher UI and loads the compact sites list endpoint
+ *
+ * @package automattic/jetpack
+ */
+
+use Automattic\Jetpack\Connection\Manager as Connection_Manager;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+// Load the Jetpack endpoint (not needed on WordPress.com simple sites)
+if ( ! ( defined( 'IS_WPCOM' ) && IS_WPCOM ) ) {
+	require_once __DIR__ . '/site-switcher-endpoint.php';
+}
+
+/**
+ * Enqueue site switcher scripts in all wp-admin pages.
+ */
+function jetpack_site_switcher_enqueue_scripts() {
+	// Only enqueue for users connected to WordPress.com (unless on WPCOM where all users are connected)
+	if ( ! ( defined( 'IS_WPCOM' ) && IS_WPCOM ) ) {
+		$connection_manager = new Connection_Manager();
+		if ( ! $connection_manager->is_user_connected() ) {
+			return;
+		}
+	}
+
+	// Load asset file for dependencies and version
+	$asset_file = JETPACK__PLUGIN_DIR . '_inc/build/site-switcher.min.asset.php';
+	$asset      = file_exists( $asset_file ) ? require $asset_file : array(
+		'dependencies' => array( 'wp-api-fetch', 'wp-commands', 'wp-element', 'wp-i18n', 'wp-icons' ),
+		'version'      => JETPACK__VERSION,
+	);
+
+	// Register and enqueue site switcher JavaScript
+	wp_enqueue_script(
+		'jetpack-site-switcher',
+		plugins_url( '_inc/build/site-switcher.min.js', JETPACK__PLUGIN_FILE ),
+		$asset['dependencies'],
+		$asset['version'],
+		true
+	);
+
+	// Pass configuration to JavaScript
+	$api_path = ( defined( 'IS_WPCOM' ) && IS_WPCOM )
+		? '/rest/v1.1/me/sites/compact'
+		: '/jetpack/v4/sites/compact';
+
+	wp_add_inline_script(
+		'jetpack-site-switcher',
+		sprintf(
+			'window.jetpackSiteSwitcherConfig = %s;',
+			wp_json_encode(
+				array(
+					'userId'  => get_current_user_id(),
+					'apiPath' => $api_path,
+				),
+				JSON_HEX_TAG | JSON_HEX_AMP | JSON_UNESCAPED_SLASHES
+			)
+		),
+		'before'
+	);
+}
+
+add_action( 'admin_enqueue_scripts', 'jetpack_site_switcher_enqueue_scripts' );