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✏️ Editing: admin-widgets-bundle.php

<?php

class SiteOrigin_Panels_Admin_Widgets_Bundle {

function __construct() {
		if ( isset( $_GET['siteorigin-pa-install'] ) ) {
			add_action( 'admin_menu', array( $this, 'activation_page' ) );
		}
	}

public static function single() {
		static $single;
		return empty( $single ) ? $single = new self() : $single;
	}

function activation_page() {
		add_plugins_page(
			__( 'Install Page Builder Plugin', 'siteorigin-panels' ),
			__( 'Install Page Builder Plugin', 'siteorigin-panels' ),
			'install_plugins',
			'siteorigin_panels_plugin_activation',
			array( $this, 'render_page' )
		);
	}

function render_page() {
		?>
		<div class="wrap">
			<?php
			/** All plugin information will be stored in an array for processing */
			$plugin = array();

/** Checks for actions from hover links to process the installation */
			if ( isset( $_GET[ sanitize_key( 'plugin' ) ] ) && ( isset( $_GET[ sanitize_key( 'siteorigin-pa-install' ) ] ) && 'install-plugin' == $_GET[ sanitize_key( 'siteorigin-pa-install' ) ] ) && current_user_can( 'install_plugins' ) ) {
				check_admin_referer( 'siteorigin-pa-install' );

$plugin['name'] = $_GET['plugin_name']; // Plugin name
				$plugin['slug'] = $_GET['plugin']; // Plugin slug

if ( ! empty( $_GET['plugin_source'] ) ) {
					$plugin['source'] = $_GET['plugin_source'];
				} else {
					$plugin['source'] = false;
				}

/** Pass all necessary information via URL if WP_Filesystem is needed */
				$url    = wp_nonce_url(
					add_query_arg(
						array(
							'page'                  => 'siteorigin_panels_plugin_activation',
							'plugin'                => urlencode( $plugin['slug'] ),
							'plugin_name'           => urlencode( $plugin['name'] ),
							'plugin_source'         => urlencode( $plugin['source'] ),
							'siteorigin-pa-install' => 'install-plugin',
						),
						admin_url( 'themes.php' )
					),
					'siteorigin-pa-install'
				);
				$method = ''; // Leave blank so WP_Filesystem can populate it as necessary
				$fields = array( sanitize_key( 'siteorigin-pa-install' ) ); // Extra fields to pass to WP_Filesystem

if ( false === ( $creds = request_filesystem_credentials( $url, $method, false, false, $fields ) ) ) {
					return true;
				}

if ( ! WP_Filesystem( $creds ) ) {
					request_filesystem_credentials( $url, $method, true, false, $fields ); // Setup WP_Filesystem
					return true;
				}

require_once ABSPATH . 'wp-admin/includes/plugin-install.php'; // Need for plugins_api
				require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php'; // Need for upgrade classes

/** Prep variables for Plugin_Installer_Skin class */
				$title = sprintf( __( 'Installing %s', 'siteorigin-panels' ), $plugin['name'] );
				$url   = add_query_arg( array(
					'action' => 'install-plugin',
					'plugin' => urlencode( $plugin['slug'] )
				), 'update.php' );
				if ( isset( $_GET['from'] ) ) {
					$url .= add_query_arg( 'from', urlencode( stripslashes( $_GET['from'] ) ), $url );
				}

$nonce = 'install-plugin_' . $plugin['slug'];

// Find the source of the plugin
				$source = ! empty( $plugin['source'] ) ? $plugin['source'] : 'http://downloads.wordpress.org/plugin/' . urlencode( $plugin['slug'] ) . '.zip';

/** Create a new instance of Plugin_Upgrader */
				$upgrader = new Plugin_Upgrader( $skin = new Plugin_Installer_Skin( compact( 'type', 'title', 'url', 'nonce', 'plugin', 'api' ) ) );

/** Perform the action and install the plugin from the $source urldecode() */
				$upgrader->install( $source );

/** Flush plugins cache so we can make sure that the installed plugins list is always up to date */
				wp_cache_flush();
			}
			?>
		</div>
		<?php
	}

static function install_url( $plugin, $plugin_name, $source = false ) {
		// This is to prevent the issue where this URL is called from outside the admin
		if ( ! is_admin() || ! function_exists( 'get_plugins' ) ) {
			return false;
		}

$plugins = get_plugins();
		$plugins = array_keys( $plugins );

$installed = false;
		foreach ( $plugins as $plugin_path ) {
			if ( strpos( $plugin_path, $plugin . '/' ) === 0 ) {
				$installed = true;
				break;
			}
		}

if ( $installed && ! is_plugin_active( $plugin ) ) {
			return wp_nonce_url( self_admin_url( 'plugins.php?action=activate&plugin=' . $plugin_path ), 'activate-plugin_' . $plugin_path );
		} elseif ( $installed && is_plugin_active( $plugin ) ) {
			return '#';
		} else {
			return wp_nonce_url(
				add_query_arg(
					array(
						'page'                  => 'siteorigin_panels_plugin_activation',
						'plugin'                => $plugin,
						'plugin_name'           => $plugin_name,
						'plugin_source'         => ! empty( $source ) ? urlencode( $source ) : false,
						'siteorigin-pa-install' => 'install-plugin',
					),
					admin_url( 'plugins.php' )
				),
				'siteorigin-pa-install'
			);
		}
	}

}

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