wp-m365-login/includes/class-m365-login.php

<?php
/**
 * Plugin bootstrap.
 *
 * @package M365_Login
 */

defined( 'ABSPATH' ) || exit;

/**
 * Wires the individual components together.
 */
final class M365_Login {

	/**
	 * Singleton instance.
	 *
	 * @var M365_Login|null
	 */
	private static $instance = null;

	/**
	 * Settings component.
	 *
	 * @var M365_Login_Settings
	 */
	public $settings;

	/**
	 * Authentication component.
	 *
	 * @var M365_Login_Auth
	 */
	public $auth;

	/**
	 * Microsoft Graph client.
	 *
	 * @var M365_Login_Graph
	 */
	public $graph;

	/**
	 * User sync component.
	 *
	 * @var M365_Login_Sync
	 */
	public $sync;

	/**
	 * Login button component.
	 *
	 * @var M365_Login_Button
	 */
	public $button;

	/**
	 * Admin component.
	 *
	 * @var M365_Login_Admin|null
	 */
	public $admin = null;

	/**
	 * Returns the singleton.
	 *
	 * @return M365_Login
	 */
	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Constructor.
	 */
	private function __construct() {
		add_action( 'init', array( $this, 'load_textdomain' ) );

		$this->settings = new M365_Login_Settings();
		$this->graph    = new M365_Login_Graph( $this->settings );
		$this->auth     = new M365_Login_Auth( $this->settings, $this->graph );
		$this->sync     = new M365_Login_Sync( $this->settings, $this->graph );
		$this->button   = new M365_Login_Button( $this->settings );

		if ( is_admin() ) {
			$this->admin = new M365_Login_Admin( $this->settings, $this->auth, $this->graph, $this->sync );
		}

		add_filter( 'plugin_action_links_' . plugin_basename( M365_LOGIN_FILE ), array( $this, 'action_links' ) );
	}

	/**
	 * Loads bundled translations.
	 */
	public function load_textdomain() {
		load_plugin_textdomain( 'm365-login', false, dirname( plugin_basename( M365_LOGIN_FILE ) ) . '/languages' );
	}

	/**
	 * Adds a "Settings" link on the plugins screen.
	 *
	 * @param string[] $links Existing links.
	 * @return string[]
	 */
	public function action_links( $links ) {
		$url = admin_url( 'admin.php?page=m365-login' );
		array_unshift( $links, '<a href="' . esc_url( $url ) . '">' . esc_html__( 'Settings', 'm365-login' ) . '</a>' );
		return $links;
	}

	/**
	 * Activation hook: seed defaults and check requirements.
	 */
	public static function activate() {
		if ( version_compare( PHP_VERSION, '7.4', '<' ) ) {
			deactivate_plugins( plugin_basename( M365_LOGIN_FILE ) );
			wp_die(
				esc_html__( 'M365 Login requires PHP 7.4 or newer.', 'm365-login' ),
				esc_html__( 'Plugin activation failed', 'm365-login' ),
				array( 'back_link' => true )
			);
		}

		if ( ! function_exists( 'openssl_encrypt' ) ) {
			deactivate_plugins( plugin_basename( M365_LOGIN_FILE ) );
			wp_die(
				esc_html__( 'M365 Login requires the PHP OpenSSL extension (needed to verify Microsoft token signatures and to encrypt the client secret).', 'm365-login' ),
				esc_html__( 'Plugin activation failed', 'm365-login' ),
				array( 'back_link' => true )
			);
		}

		$settings = new M365_Login_Settings();
		if ( false === get_option( M365_LOGIN_OPTION, false ) ) {
			add_option( M365_LOGIN_OPTION, $settings->defaults(), '', 'no' );
		}
	}
}