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Editing: class-akismet-compatible-plugins.php

<?php
/**
 * Handles compatibility checks for Akismet with other plugins.
 *
 * @package Akismet
 * @since 5.4.0
 */

declare( strict_types = 1 );

// Following existing Akismet convention for file naming.
// phpcs:ignore WordPress.Files.FileName.NotHyphenatedLowercase

/**
 * Class for managing compatibility checks for Akismet with other plugins.
 *
 * This class includes methods for determining whether specific plugins are
 * installed and active relative to the ability to work with Akismet.
 */
class Akismet_Compatible_Plugins {
	/**
	 * The endpoint for the compatible plugins API.
	 *
	 * @var string
	 */
	protected const COMPATIBLE_PLUGIN_ENDPOINT = 'https://rest.akismet.com/1.2/compatible-plugins';

/**
	 * The error key for the compatible plugins API error.
	 *
	 * @var string
	 */
	protected const COMPATIBLE_PLUGIN_API_ERROR = 'akismet_compatible_plugins_api_error';

/**
	 * The valid fields for a compatible plugin object.
	 *
	 * @var array
	 */
	protected const COMPATIBLE_PLUGIN_FIELDS = array(
		'slug',
		'name',
		'logo',
		'help_url',
		'path',
	);

/**
	 * The cache key for the compatible plugins.
	 *
	 * @var string
	 */
	protected const CACHE_KEY = 'akismet_compatible_plugin_list';

/**
	 * How many plugins should be visible by default?
	 *
	 * @var int
	 */
	public const DEFAULT_VISIBLE_PLUGIN_COUNT = 2;

/**
	 * Get the list of active, installed compatible plugins.
	 *
	 * @param bool $bypass_cache Whether to bypass the cache and fetch fresh data.
	 * @return WP_Error|array {
	 *     Array of active, installed compatible plugins with their metadata.
	 *     @type string $name     The display name of the plugin
	 *     @type string $help_url URL to the plugin's help documentation
	 *     @type string $logo     URL or path to the plugin's logo
	 * }
	 */
	public static function get_installed_compatible_plugins( bool $bypass_cache = false ) {
		// Retrieve and validate the full compatible plugins list.
		$compatible_plugins = static::get_compatible_plugins( $bypass_cache );

if ( empty( $compatible_plugins ) ) {
			return new WP_Error(
				self::COMPATIBLE_PLUGIN_API_ERROR,
				__( 'Error getting compatible plugins.', 'akismet' )
			);
		}

// Retrieve all installed plugins once.
		$all_plugins = get_plugins();

// Build list of compatible plugins that are both installed and active.
		$active_compatible_plugins = array();

foreach ( $compatible_plugins as $slug => $data ) {
			$path = $data['path'];
			// Skip if not installed.
			if ( ! isset( $all_plugins[ $path ] ) ) {
				continue;
			}
			// Check activation: per-site or network-wide (multisite).
			$site_active    = is_plugin_active( $path );
			$network_active = is_multisite() && is_plugin_active_for_network( $path );
			if ( $site_active || $network_active ) {
				$active_compatible_plugins[ $slug ] = $data;
			}
		}

return $active_compatible_plugins;
	}

/**
	 * Initializes action hooks for the class.
	 *
	 * @return void
	 */
	public static function init(): void {
		add_action( 'activated_plugin', array( static::class, 'handle_plugin_change' ), true );
		add_action( 'deactivated_plugin', array( static::class, 'handle_plugin_change' ), true );
	}

/**
	 * Handles plugin activation and deactivation events.
	 *
	 * @param string $plugin The path to the main plugin file from plugins directory.
	 * @return void
	 */
	public static function handle_plugin_change( string $plugin ): void {
		$cached_plugins = static::get_cached_plugins();

/**
		 * Terminate if nothing's cached.
		 */
		if ( false === $cached_plugins ) {
			return;
		}

$plugin_change_should_invalidate_cache = in_array( $plugin, array_column( $cached_plugins, 'path' ) );

/**
		 * Purge the cache if the plugin is activated or deactivated.
		 */
		if ( $plugin_change_should_invalidate_cache ) {
			static::purge_cache();
		}
	}

/**
	 * Gets plugins that are compatible with Akismet from the Akismet API.
	 *
	 * @param bool $bypass_cache Whether to bypass the cache and fetch fresh data.
	 * @return array
	 */
	private static function get_compatible_plugins( bool $bypass_cache = false ): array {
		// Return cached result if present (false => cache miss; empty array is valid).
		$cached_plugins = static::get_cached_plugins();

if ( false !== $cached_plugins && ! $bypass_cache ) {
			return $cached_plugins;
		}

$response = wp_remote_get(
			self::COMPATIBLE_PLUGIN_ENDPOINT
		);

$sanitized = static::validate_compatible_plugin_response( $response );

if ( false === $sanitized ) {
			return array();
		}

/**
		 * Sets local static associative array of plugin data keyed by plugin slug.
		 */
		$compatible_plugins = array();

foreach ( $sanitized as $plugin ) {
			$compatible_plugins[ $plugin['slug'] ] = $plugin;
		}

static::set_cached_plugins( $compatible_plugins );

return $compatible_plugins;
	}

/**
	 * Validates a response object from the Compatible Plugins API.
	 *
	 * @param array|WP_Error $response
	 * @return array|false
	 */
	private static function validate_compatible_plugin_response( $response ) {
		/**
		 * Terminates the function if the response is a WP_Error object.
		 */
		if ( is_wp_error( $response ) ) {
			return false;
		}

/**
		 * The response returned is an array of header + body string data.
		 * This pops off the body string for processing.
		 */
		$response_body = wp_remote_retrieve_body( $response );

if ( empty( $response_body ) ) {
			return false;
		}

$plugins = json_decode( $response_body, true );

if ( false === is_array( $plugins ) ) {
			return false;
		}

foreach ( $plugins as $plugin ) {
			if ( ! is_array( $plugin ) ) {
				/**
				 * Skips to the next iteration if for some reason the plugin is not an array.
				 */
				continue;
			}

// Ensure that the plugin config read in from the API has all the required fields.
			$plugin_key_count = count(
				array_intersect_key( $plugin, array_flip( static::COMPATIBLE_PLUGIN_FIELDS ) )
			);

$does_not_have_all_required_fields = ! (
				$plugin_key_count === count( static::COMPATIBLE_PLUGIN_FIELDS )
			);

if ( $does_not_have_all_required_fields ) {
				return false;
			}

if ( false === static::has_valid_plugin_path( $plugin['path'] ) ) {
				return false;
			}
		}

return static::sanitize_compatible_plugin_response( $plugins );
	}

/**
	 * Validates a plugin path format.
	 *
	 * The path should be in the format of 'plugin-name/plugin-name.php'.
	 * Allows alphanumeric characters, dashes, underscores, and optional dots in folder names.
	 *
	 * @param string $path
	 * @return bool
	 */
	private static function has_valid_plugin_path( string $path ): bool {
		return preg_match( '/^[a-zA-Z0-9._-]+\/[a-zA-Z0-9_-]+\.php$/', $path ) === 1;
	}

/**
	 * Sanitizes a response object from the Compatible Plugins API.
	 *
	 * @param array $plugins
	 * @return array
	 */
	private static function sanitize_compatible_plugin_response( array $plugins = array() ): array {
		foreach ( $plugins as $key => $plugin ) {
			$plugins[ $key ]             = array_map( 'sanitize_text_field', $plugin );
			$plugins[ $key ]['help_url'] = sanitize_url( $plugins[ $key ]['help_url'] );
			$plugins[ $key ]['logo']     = sanitize_url( $plugins[ $key ]['logo'] );
		}

return $plugins;
	}

/**
	 * @param array $plugins
	 * @return bool
	 */
	private static function set_cached_plugins( array $plugins ): bool {
		$_blog_id = (int) get_current_blog_id();

return set_transient(
			static::CACHE_KEY . "_$_blog_id",
			$plugins,
			DAY_IN_SECONDS
		);
	}

/**
	 * Attempts to get cached compatible plugins.
	 *
	 * @return mixed|false
	 */
	private static function get_cached_plugins() {
		$_blog_id = (int) get_current_blog_id();

return get_transient(
			static::CACHE_KEY . "_$_blog_id"
		);
	}

/**
	 * Purges the cache for the compatible plugins.
	 *
	 * @return bool
	 */
	private static function purge_cache(): bool {
		$_blog_id = (int) get_current_blog_id();

return delete_transient(
			static::CACHE_KEY . "_$_blog_id"
		);
	}
}