Initial plugin setup (v0.0.1)

- Create initial WordPress plugin structure
- Add Prometheus metrics collector with default metrics
- Implement authenticated /metrics endpoint with Bearer token
- Add license management integration
- Create admin settings page under Settings > Metrics
- Set up Gitea CI/CD pipeline for automated releases
- Add extensibility via wp_prometheus_collect_metrics hook

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

wp-prometheus.php

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+<?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' );