feat: Add PluginUpdater to Support Plugin Updates from Custom API

.changeset/eleven-oranges-hope.md

@@ -0,0 +1,5 @@
+---
+'@faustwp/wordpress-plugin': minor
+---
+
+- Added a custom PluginUpdater class to enable FaustWP plugin updates from an external API endpoint.

plugins/faustwp/faustwp.php

@@ -12,6 +12,7 @@
  * Version: 1.4.1
  * Requires PHP: 7.2
  * Requires at least: 5.7
+ * Update URI: false
  *
  * @package FaustWP
  */
@@ -28,6 +29,8 @@
 define( 'FAUSTWP_PATH', plugin_basename( FAUSTWP_FILE ) );
 define( 'FAUSTWP_SLUG', dirname( plugin_basename( FAUSTWP_FILE ) ) );
 
+require FAUSTWP_DIR . '/includes/updates/class-plugin-updater.php';
+require FAUSTWP_DIR . '/includes/updates/check-for-updates.php';
 require FAUSTWP_DIR . '/includes/auth/functions.php';
 require FAUSTWP_DIR . '/includes/telemetry/functions.php';
 require FAUSTWP_DIR . '/includes/replacement/functions.php';

plugins/faustwp/includes/updates/check-for-updates.php

@@ -0,0 +1,24 @@
+<?php
+/**
+ * Plugin Updater Initialization File
+ *
+ * This file is responsible for initializing the plugin update checker
+ * for the FaustWP plugin, allowing it to receive updates from a custom API endpoint.
+ *
+ * @package   FaustWP
+ */
+
+namespace WPE\FaustWP\Updates;
+
+/**
+ * Initialize the checking for plugin updates.
+ */
+function check_for_updates() {
+	$properties = array(
+		'plugin_slug'     => 'faustwp', // This must match the key in "https://wpe-plugin-updates.wpengine.com/plugins.json".
+		'plugin_basename' => FAUSTWP_PATH,
+	);
+
+	new Plugin_Updater( $properties );
+}
+add_action( 'admin_init', __NAMESPACE__ . '\check_for_updates' );

plugins/faustwp/includes/updates/class-plugin-updater.php

@@ -0,0 +1,249 @@
+<?php
+/**
+ * The Plugin_Updater class which can be used to pull plugin updates from a new location.
+ *
+ * @package FaustWP
+ */
+
+namespace WPE\FaustWP\Updates;
+
+// Exit if accessed directly.
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+use stdClass;
+
+/**
+ * The Plugin_Updater class which can be used to pull plugin updates from a new location.
+ */
+class Plugin_Updater {
+	/**
+	 * The URL where the api is located.
+	 *
+	 * @var ApiUrl
+	 */
+	private $api_url;
+
+	/**
+	 * The amount of time to wait before checking for new updates.
+	 *
+	 * @var CacheTime
+	 */
+	private $cache_time;
+
+	/**
+	 * These properties are passed in when instantiating to identify the plugin and it's update location.
+	 *
+	 * @var Properties
+	 */
+	private $properties;
+
+	/**
+	 * Get the class constructed.
+	 *
+	 * @param Properties $properties These properties are passed in when instantiating to identify the plugin and it's update location.
+	 */
+	public function __construct( $properties ) {
+		if (
+			empty( $properties['plugin_slug'] ) ||
+			empty( $properties['plugin_basename'] )
+		) {
+			// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_error_log
+			error_log( 'WPE Secure Plugin Updater received a malformed request.' );
+			return;
+		}
+
+		$this->api_url = 'https://wpe-plugin-updates.wpengine.com/';
+
+		$this->cache_time = time() + HOUR_IN_SECONDS * 5;
+
+		$this->properties = $this->get_full_plugin_properties( $properties, $this->api_url );
+
+		if ( ! $this->properties ) {
+			return;
+		}
+
+		$this->register();
+	}
+
+	/**
+	 * Get the full plugin properties, including the directory name, version, basename, and add a transient name.
+	 *
+	 * @param Properties $properties These properties are passed in when instantiating to identify the plugin and it's update location.
+	 * @param ApiUrl     $api_url    The URL where the api is located.
+	 */
+	public function get_full_plugin_properties( $properties, $api_url ) {
+		$plugins = \get_plugins();
+
+		// Scan through all plugins installed and find the one which matches this one in question.
+		foreach ( $plugins as $plugin_basename => $plugin_data ) {
+			// Match using the passed-in plugin's basename.
+			if ( $plugin_basename === $properties['plugin_basename'] ) {
+				// Add the values we need to the properties.
+				$properties['plugin_dirname']                   = dirname( $plugin_basename );
+				$properties['plugin_version']                   = $plugin_data['Version'];
+				$properties['plugin_update_transient_name']     = 'wpesu-plugin-' . sanitize_title( $properties['plugin_dirname'] );
+				$properties['plugin_update_transient_exp_name'] = 'wpesu-plugin-' . sanitize_title( $properties['plugin_dirname'] ) . '-expiry';
+				$properties['plugin_manifest_url']              = trailingslashit( $api_url ) . trailingslashit( $properties['plugin_slug'] ) . 'info.json';
+
+				return $properties;
+			}
+		}
+
+		// No matching plugin was found installed.
+		return null;
+	}
+
+	/**
+	 * Register hooks.
+	 *
+	 * @return void
+	 */
+	public function register() {
+		add_filter( 'plugins_api', array( $this, 'filter_plugin_update_info' ), 20, 3 );
+		add_filter( 'pre_set_site_transient_update_plugins', array( $this, 'filter_plugin_update_transient' ) );
+	}
+
+	/**
+	 * Filter the plugin update transient to take over update notifications.
+	 *
+	 *  @param ?object $transient_value The value of the `site_transient_update_plugins` transient.
+	 *
+	 * @handles site_transient_update_plugins
+	 * @return object
+	 */
+	public function filter_plugin_update_transient( $transient_value ) {
+		// No update object exists. Return early.
+		if ( empty( $transient ) ) {
+			return $transient;
+		}
+
+		$result = $this->fetch_plugin_info();
+
+		if ( false === $result ) {
+			return $transient;
+		}
+
+		if ( version_compare( $this->properties['plugin_version'], $result->version, '<' ) ) {
+			$res                                 = $this->parse_plugin_info( $result );
+			$transient->response[ $res->plugin ] = $res;
+			$transient->checked[ $res->plugin ]  = $result->version;
+		}
+
+		return $transient;
+	}
+
+	/**
+	 * Filters the plugin update information.
+	 *
+	 * @param object $res    The response to be modified for the plugin in question.
+	 * @param string $action The action in question.
+	 * @param object $args   The arguments for the plugin in question.
+	 *
+	 * @handles plugins_api
+	 * @return object
+	 */
+	public function filter_plugin_update_info( $res, $action, $args ) {
+		// Do nothing if this is not about getting plugin information.
+		if ( 'plugin_information' !== $action ) {
+			return $res;
+		}
+
+		// Do nothing if it is not our plugin.
+		if ( $this->properties['plugin_dirname'] !== $args->slug ) {
+			return $res;
+		}
+
+		$result = $this->fetch_plugin_info();
+
+		// Do nothing if we don't get the correct response from the server.
+		if ( false === $result ) {
+			return $res;
+		}
+
+		return $this->parse_plugin_info( $result );
+	}
+
+	/**
+	 * Fetches the plugin update object from the WP Product Info API.
+	 *
+	 * @return object|false
+	 */
+	private function fetch_plugin_info() {
+		// Fetch cache first.
+		$expiry   = get_option( $this->properties['plugin_update_transient_exp_name'], 0 );
+		$response = get_option( $this->properties['plugin_update_transient_name'] );
+
+		if ( empty( $expiry ) || time() > $expiry || empty( $response ) ) {
+			$response = wp_remote_get(
+				$this->properties['plugin_manifest_url'],
+				array(
+					'timeout' => 10,
+					'headers' => array(
+						'Accept' => 'application/json',
+					),
+				)
+			);
+
+			if (
+				is_wp_error( $response ) ||
+				200 !== wp_remote_retrieve_response_code( $response ) ||
+				empty( wp_remote_retrieve_body( $response ) )
+			) {
+				return false;
+			}
+
+			$response = wp_remote_retrieve_body( $response );
+
+			// Cache the response.
+			update_option( $this->properties['plugin_update_transient_exp_name'], $this->cache_time, false );
+			update_option( $this->properties['plugin_update_transient_name'], $response, false );
+		}
+
+		$decoded_response = json_decode( $response );
+
+		if ( json_last_error() !== JSON_ERROR_NONE ) {
+			return false;
+		}
+
+		return $decoded_response;
+	}
+
+	/**
+	 * Parses the product info response into an object that WordPress would be able to understand.
+	 *
+	 * @param object $response The response object.
+	 *
+	 * @return stdClass
+	 */
+	private function parse_plugin_info( $response ) {
+
+		global $wp_version;
+
+		$res                = new stdClass();
+		$res->name          = $response->name;
+		$res->slug          = $response->slug;
+		$res->version       = $response->version;
+		$res->requires      = $response->requires;
+		$res->download_link = $response->download_link;
+		$res->trunk         = $response->download_link;
+		$res->new_version   = $response->version;
+		$res->plugin        = $this->properties['plugin_basename'];
+		$res->package       = $response->download_link;
+
+		// Plugin information modal and core update table use a strict version comparison, which is weird.
+		// If we're genuinely not compatible with the point release, use our WP tested up to version.
+		// otherwise use exact same version as WP to avoid false positive.
+		$res->tested = 1 === version_compare( substr( $wp_version, 0, 3 ), $response->tested )
+			? $response->tested
+			: $wp_version;
+
+		$res->sections = array(
+			'description' => $response->sections->description,
+			'changelog'   => $response->sections->changelog,
+		);
+
+		return $res;
+	}
+}