1 files changed, 105 insertions, 0 deletions
diff --git a/plugins/jetpack/3rd-party/jetpack-backup.php b/plugins/jetpack/3rd-party/jetpack-backup.php
new file mode 100644
index 00000000..ec1880b3
--- /dev/null
+++ b/plugins/jetpack/3rd-party/jetpack-backup.php
@@ -0,0 +1,105 @@
+<?php
+/**
+ * Compatibility functions for the Jetpack Backup plugin.
+ * https://wordpress.org/plugins/jetpack-backup/
+ *
+ * @since 10.4
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Jetpack_Backup;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+const PLUGIN_SLUG = 'jetpack-backup';
+const PLUGIN_FILE = 'jetpack-backup/jetpack-backup.php';
+
+add_action( 'admin_notices', __NAMESPACE__ . '\error_notice' );
+add_action( 'admin_init', __NAMESPACE__ . '\try_install' );
+
+/**
+ * Verify the intent to install Jetpack Backup, and kick off installation.
+ *
+ * This works in tandem with a JITM set up in the JITM package.
+ */
+function try_install() {
+	if ( ! isset( $_GET['jetpack-backup-action'] ) ) {
+		return;
+	}
+
+	check_admin_referer( 'jetpack-backup-install' );
+
+	$result = false;
+	// If the plugin install fails, redirect to plugin install page pre-populated with jetpack-backup search term.
+	$redirect_on_error = admin_url( 'plugin-install.php?s=jetpack-backup&tab=search&type=term' );
+
+	// Attempt to install and activate the plugin.
+	if ( current_user_can( 'activate_plugins' ) ) {
+		switch ( $_GET['jetpack-backup-action'] ) {
+			case 'install':
+				$result = install_and_activate();
+				break;
+			case 'activate':
+				$result = activate();
+				break;
+		}
+	}
+
+	if ( $result ) {
+		/** This action is already documented in _inc/lib/class.core-rest-api-endpoints.php */
+		do_action( 'jetpack_activated_plugin', PLUGIN_FILE, 'jitm' );
+		$redirect = admin_url( 'admin.php?page=jetpack-backup' );
+	} else {
+		$redirect = add_query_arg( 'jetpack-backup-install-error', true, $redirect_on_error );
+	}
+
+	wp_safe_redirect( $redirect );
+
+	exit;
+}
+
+/**
+ * Install and activate the Jetpack Backup plugin.
+ *
+ * @return bool result of installation
+ */
+function install_and_activate() {
+	jetpack_require_lib( 'plugins' );
+	$result = \Jetpack_Plugins::install_and_activate_plugin( PLUGIN_SLUG );
+
+	if ( is_wp_error( $result ) ) {
+		return false;
+	} else {
+		return true;
+	}
+}
+
+/**
+ * Activate the Jetpack Backup plugin.
+ *
+ * @return bool result of activation
+ */
+function activate() {
+	$result = activate_plugin( PLUGIN_FILE );
+
+	// Activate_plugin() returns null on success.
+	return is_null( $result );
+}
+
+/**
+ * Notify the user that the installation of Jetpack Backup failed.
+ */
+function error_notice() {
+	if ( empty( $_GET['jetpack-backup-install-error'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended
+		return;
+	}
+
+	?>
+	<div class="notice notice-error is-dismissible">
+		<p><?php esc_html_e( 'There was an error installing Jetpack Backup. Please try again.', 'jetpack' ); ?></p>
+	</div>
+	<?php
+}