class-installer.php

<?php
if ( ! defined( 'ABSPATH' ) ) exit;

/**
 * Install suggested plugins
 */

if ( !class_exists('cmplz_installer') ){
	class cmplz_installer {
		private $slug = '';
		public $action;
		public function __construct($slug) {
			if (!function_exists('is_plugin_active')) {
				include_once(ABSPATH . 'wp-admin/includes/plugin.php');
			}
			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;

			ob_start();

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

			ob_get_clean();
			
		}

		/**
		 * Get slug to activate plugin with
		 * @return string
		 */
		public function get_activation_slug(){
			$slugs = [
				'burst-pro' => 'burst-pro/burst-pro.php',
				'burst-statistics' => 'burst-statistics/burst.php',
				'really-simple-ssl' => 'really-simple-ssl/rlrsssl-really-simple-ssl.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-pro' => 'burst',
				'burst-statistics' => 'burst',
				'really-simple-ssl' => 'rsssl',
				'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
		 */
		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';
				$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();
			//when activated from the network admin, we assume the user wants network activated
			$networkwide = is_multisite() && is_network_admin();
			if ( !defined('DOING_CRON') ) {
				define( 'DOING_CRON', true);
			}

			$result = activate_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';
			$plugin_info = get_transient('cmplz_'.$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('cmplz_'.$this->slug . '_plugin_info', $plugin_info, WEEK_IN_SECONDS);
				}
			}
			return $plugin_info;
		}
	}

}