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Edit File: class-installer.php

<?php
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
if ( ! function_exists( 'is_plugin_active' ) ) {
	include_once ABSPATH . 'wp-admin/includes/plugin.php';
}
/**
 * Install suggested plugins
 */

if ( ! class_exists( 'rsssl_installer' ) ) {
	class rsssl_installer {
		private $slug = '';
		public function __construct( $slug ) {
			if ( ! current_user_can( 'install_plugins' ) ) {
				return;
			}

$this->slug = $slug;
		}

/**
		 * Check if plugin is downloaded
		 * @return bool
		 */

public function plugin_is_downloaded() {
			return file_exists( trailingslashit( WP_PLUGIN_DIR ) . $this->get_activation_slug() );
		}
		/**
		 * Check if plugin is activated
		 * @return bool
		 */
		public function plugin_is_activated() {
			return is_plugin_active( $this->get_activation_slug() );
		}

/**
		 * Install plugin
		 * @param string $step
		 *
		 * @return void
		 */
		public function install( $step ) {
			if ( ! current_user_can( 'install_plugins' ) ) {
				return;
			}

if ( 'download' === $step ) {
				$this->download_plugin();
			}
			if ( 'activate' === $step ) {
				$this->activate_plugin();
			}
		}

/**
		 * Get slug to activate plugin with
		 * @return string
		 */
		public function get_activation_slug() {
			$slugs = [
				'burst-statistics'           => 'burst-statistics/burst.php',
				'complianz-gdpr'             => 'complianz-gdpr/complianz-gpdr.php',
				'complianz-terms-conditions' => 'complianz-terms-conditions/complianz-terms-conditions.php',
			];
			return $slugs[ $this->slug ];
		}

/**
		 * Cancel shepherd tour
		 * @return void
		 */
		public function cancel_tour() {
			$prefixes = [
				'burst-statistics'           => 'burst',
				'complianz-gdpr'             => 'cmplz',
				'complianz-terms-conditions' => 'cmplz_tc',
			];
			$prefix   = $prefixes[ $this->slug ];
			update_site_option( $prefix . '_tour_started', false );
			update_site_option( $prefix . '_tour_shown_once', true );
			delete_transient( $prefix . '_redirect_to_settings' );
		}

/**
		 * Download the plugin
		 * @return bool
		 * @todo restore
		 */
		public function download_plugin() {
			if ( ! current_user_can( 'install_plugins' ) ) {
				return false;
			}

if ( get_transient( 'rsssl_plugin_download_active' ) !== $this->slug ) {
				set_transient( 'rsssl_plugin_download_active', $this->slug, MINUTE_IN_SECONDS );
				$info = $this->get_plugin_info();

$download_link = esc_url_raw( $info->versions['trunk'] );

require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
				require_once ABSPATH . 'wp-admin/includes/file.php';
				include_once ABSPATH . 'wp-admin/includes/plugin-install.php';

if ( ! is_writable( WP_PLUGIN_DIR ) ) {
					return false;
				}

$skin     = new WP_Ajax_Upgrader_Skin();
				$upgrader = new Plugin_Upgrader( $skin );

$result = $upgrader->install( $download_link );

if ( is_wp_error( $result ) ) {
					return false;
				}

delete_transient( 'rsssl_plugin_download_active' );
			}

return true;
		}

/**
		 * Activate the plugin
		 *
		 * @return bool
		 */
		public function activate_plugin() {
			if ( ! current_user_can( 'install_plugins' ) ) {
				return false;
			}

$slug             = $this->get_activation_slug();
			$plugin_file_path = trailingslashit( WP_PLUGIN_DIR ) . $slug;

// Make sure the plugin file exists before trying to activate it
			if ( ! file_exists( $plugin_file_path ) ) {
				return false;
			}

// Use plugin_basename to generate the correct slug, considering the WP_PLUGIN_DIR
			$plugin_slug = plugin_basename( $plugin_file_path );

$networkwide = is_multisite() && rsssl_is_networkwide_active();

if ( ! defined( 'DOING_CRON' ) ) {
				define( 'DOING_CRON', true );//phpcs:ignore
			}

$result = activate_plugin( $plugin_slug, '', $networkwide );
			if ( is_wp_error( $result ) ) {
				return false;
			}

$this->cancel_tour();
			return true;
		}

/**
		 * Get plugin info
		 * @return array|WP_Error
		 */
		public function get_plugin_info() {
			require_once ABSPATH . 'wp-admin/includes/plugin-install.php';
			$plugin_info = get_transient( 'rsssl_' . $this->slug . '_plugin_info' );
			if ( empty( $plugin_info ) ) {
				$plugin_info = plugins_api( 'plugin_information', array( 'slug' => $this->slug ) );
				if ( ! is_wp_error( $plugin_info ) ) {
					set_transient( 'rsssl_' . $this->slug . '_plugin_info', $plugin_info, WEEK_IN_SECONDS );
				}
			}
			return $plugin_info;
		}
	}

}

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