wp-prometheus/wp-prometheus.php

<?php
/**
 * Plugin Name: WP Prometheus
 * Plugin URI: https://src.bundespruefstelle.ch/magdev/wp-prometheus
 * Description: Prometheus metrics endpoint for WordPress with extensible hooks for custom metrics.
 * Version: 0.0.1
 * Requires at least: 6.4
 * Requires PHP: 8.3
 * Author: Marco Graetsch
 * Author URI: https://src.bundespruefstelle.ch/magdev
 * License: GPL v2 or later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain: wp-prometheus
 * Domain Path: /languages
 *
 * @package WP_Prometheus
 */

// Prevent direct file access.
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

/**
 * Plugin version.
 *
 * @var string
 */
define( 'WP_PROMETHEUS_VERSION', '0.0.1' );

/**
 * Plugin file path.
 *
 * @var string
 */
define( 'WP_PROMETHEUS_FILE', __FILE__ );

/**
 * Plugin directory path.
 *
 * @var string
 */
define( 'WP_PROMETHEUS_PATH', plugin_dir_path( __FILE__ ) );

/**
 * Plugin directory URL.
 *
 * @var string
 */
define( 'WP_PROMETHEUS_URL', plugin_dir_url( __FILE__ ) );

/**
 * Plugin basename.
 *
 * @var string
 */
define( 'WP_PROMETHEUS_BASENAME', plugin_basename( __FILE__ ) );

/**
 * Minimum WordPress version required.
 *
 * @var string
 */
define( 'WP_PROMETHEUS_MIN_WP_VERSION', '6.4' );

/**
 * Minimum PHP version required.
 *
 * @var string
 */
define( 'WP_PROMETHEUS_MIN_PHP_VERSION', '8.3' );

/**
 * Check requirements and bootstrap the plugin.
 *
 * @return void
 */
function wp_prometheus_init(): void {
    // Check PHP version.
    if ( version_compare( PHP_VERSION, WP_PROMETHEUS_MIN_PHP_VERSION, '<' ) ) {
        add_action( 'admin_notices', 'wp_prometheus_php_version_notice' );
        return;
    }

    // Check WordPress version.
    if ( version_compare( get_bloginfo( 'version' ), WP_PROMETHEUS_MIN_WP_VERSION, '<' ) ) {
        add_action( 'admin_notices', 'wp_prometheus_wp_version_notice' );
        return;
    }

    // Check if Composer autoloader exists.
    $autoloader = WP_PROMETHEUS_PATH . 'vendor/autoload.php';
    if ( ! file_exists( $autoloader ) ) {
        add_action( 'admin_notices', 'wp_prometheus_autoloader_notice' );
        return;
    }

    require_once $autoloader;

    // Initialize the plugin.
    \Magdev\WpPrometheus\Plugin::get_instance();
}

/**
 * Display PHP version notice.
 *
 * @return void
 */
function wp_prometheus_php_version_notice(): void {
    $message = sprintf(
        /* translators: 1: Required PHP version, 2: Current PHP version */
        __( 'WP Prometheus requires PHP version %1$s or higher. You are running PHP %2$s.', 'wp-prometheus' ),
        WP_PROMETHEUS_MIN_PHP_VERSION,
        PHP_VERSION
    );
    printf( '<div class="notice notice-error"><p>%s</p></div>', esc_html( $message ) );
}

/**
 * Display WordPress version notice.
 *
 * @return void
 */
function wp_prometheus_wp_version_notice(): void {
    $message = sprintf(
        /* translators: 1: Required WordPress version, 2: Current WordPress version */
        __( 'WP Prometheus requires WordPress version %1$s or higher. You are running WordPress %2$s.', 'wp-prometheus' ),
        WP_PROMETHEUS_MIN_WP_VERSION,
        get_bloginfo( 'version' )
    );
    printf( '<div class="notice notice-error"><p>%s</p></div>', esc_html( $message ) );
}

/**
 * Display autoloader notice.
 *
 * @return void
 */
function wp_prometheus_autoloader_notice(): void {
    $message = __( 'WP Prometheus requires Composer dependencies to be installed. Please run "composer install" in the plugin directory.', 'wp-prometheus' );
    printf( '<div class="notice notice-error"><p>%s</p></div>', esc_html( $message ) );
}

/**
 * Plugin activation hook.
 *
 * @return void
 */
function wp_prometheus_activate(): void {
    // Check requirements before activation.
    if ( version_compare( PHP_VERSION, WP_PROMETHEUS_MIN_PHP_VERSION, '<' ) ) {
        deactivate_plugins( WP_PROMETHEUS_BASENAME );
        wp_die(
            sprintf(
                /* translators: %s: Required PHP version */
                esc_html__( 'WP Prometheus requires PHP version %s or higher.', 'wp-prometheus' ),
                WP_PROMETHEUS_MIN_PHP_VERSION
            )
        );
    }

    $autoloader = WP_PROMETHEUS_PATH . 'vendor/autoload.php';
    if ( file_exists( $autoloader ) ) {
        require_once $autoloader;
        \Magdev\WpPrometheus\Installer::activate();
    }
}

/**
 * Plugin deactivation hook.
 *
 * @return void
 */
function wp_prometheus_deactivate(): void {
    $autoloader = WP_PROMETHEUS_PATH . 'vendor/autoload.php';
    if ( file_exists( $autoloader ) ) {
        require_once $autoloader;
        \Magdev\WpPrometheus\Installer::deactivate();
    }
}

/**
 * Plugin uninstall hook.
 *
 * @return void
 */
function wp_prometheus_uninstall(): void {
    $autoloader = WP_PROMETHEUS_PATH . 'vendor/autoload.php';
    if ( file_exists( $autoloader ) ) {
        require_once $autoloader;
        \Magdev\WpPrometheus\Installer::uninstall();
    }
}

// Register activation/deactivation hooks.
register_activation_hook( __FILE__, 'wp_prometheus_activate' );
register_deactivation_hook( __FILE__, 'wp_prometheus_deactivate' );

// Initialize plugin after all plugins are loaded.
add_action( 'plugins_loaded', 'wp_prometheus_init' );