pmpro-pl-sample-plugin.php

<?php
/**
 * Paid Memberships Pro - Plugin Licensing - Sample Plugin
 *
 * @package pmpro-pl-sample-plugin
 */

/*
 * Plugin Name: Paid Memberships Pro - Plugin Licensing - Sample Plugin
 * Plugin URI: https://github.com/breakfastco/pmpro-pl-sample-plugin
 * Description: A sample WordPress plugin for testing Plugin Licensing for Paid Memberships Pro. This plugin has no features other than an updater to retrieve new versions.
 * Author: Breakfast
 * Author URI: https://breakfastco.xyz/plugin-licensing-for-paid-memberships-pro/
 * License: GPLv2
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 * Version: 1.0.4
 * Requires PHP: 5.6
 * Text Domain: pmpro-pl-sample-plugin
 * Domain Path: /languages
 * GitHub Plugin URI: breakfastco/pmpro-pl-sample-plugin
 * Primary Branch: main
 */

defined( 'ABSPATH' ) || exit;

// Define plugin constants.
define( 'PMPRO_PL_SAMPLE_PLUGIN_VERSION', '1.0.4' );
define( 'PMPRO_PL_SAMPLE_PLUGIN_FILE', __FILE__ );
define( 'PMPRO_PL_SAMPLE_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
define( 'PMPRO_PL_SAMPLE_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
/**
 * This is the hash generated by PMPro Plugin Licensing for this plugin. It
 * is sent in requests to the store when activating licenses or checking for
 * updates.
 */
define( 'PMPRO_PL_SAMPLE_PLUGIN_HASH', 'd6a953c1546774366ac47ed5e32dbf17' );
/**
 * This is the URL of the store where this plugin was purchased that
 * provides updates and activates licenses.
 */
define( 'PMPRO_PL_SAMPLE_PLUGIN_STORE_URL', 'https://breakfastco.xyz' );

/**
 * PMPRO_PL_Sample_Plugin
 */
class PMPRO_PL_Sample_Plugin {

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

		// Add a plugin action link to the plugins list.
		add_filter( 'plugin_action_links_pmpro-pl-sample-plugin/pmpro-pl-sample-plugin.php', array( $this, 'add_missing_license_notice' ), 2, 2 );

		// Settings page to let users manage their license key.
		add_action( 'admin_menu', array( $this, 'add_settings_page' ) );
		add_action( 'admin_init', array( $this, 'add_settings_fields' ) );
	}

	/**
	 * Initialize the plugin.
	 */
	public function init() {
		// Load text domain for translations.
		load_plugin_textdomain( 'pmpro-pl-sample-plugin', false, dirname( plugin_basename( __FILE__ ) ) . '/languages' );

		// Load base classes (included in this plugin for distribution without dependencies).
		require_once dirname( PMPRO_PL_SAMPLE_PLUGIN_FILE ) . '/includes/class-pmpro-pl-updater-base.php';
		require_once dirname( PMPRO_PL_SAMPLE_PLUGIN_FILE ) . '/includes/class-pmpro-pl-activator-base.php';

		// Load our updater so users see pending updates for this plugin.
		require_once dirname( PMPRO_PL_SAMPLE_PLUGIN_FILE ) . '/includes/class-pmpro-pl-updater.php';
		$updater = PMPRO_PL_Sample_Updater::get_instance();
		$updater->add_hooks();

		// Activator activates licenses and checks for expiration.
		require_once dirname( PMPRO_PL_SAMPLE_PLUGIN_FILE ) . '/includes/class-pmpro-pl-activator.php';
	}

	/**
	 * Adds a link to the settings page near the Activate | Delete links on the
	 * list of plugins on the Plugins page.
	 *
	 * @param  array $links
	 * @return array
	 */
	public function add_missing_license_notice( $links ) {
		$license_key    = self::get_license_key();
		$activator      = PMPRO_PL_Sample_Activator::get_instance();
		$license_status = $activator->get_status( $license_key );
		if ( empty( $license_key ) || 'active' !== $license_status ) {
			$links[] = sprintf(
				'<a href="%s"><b>%s</b></a>',
				admin_url( 'admin.php?page=' . $this->admin_page_slug() ),
				esc_html__( 'Enable Updates', 'pmpro-pl-sample-plugin' )
			);
		}
		return $links;
	}

	public function add_settings_fields() {
		register_setting(
			'pmpro_pl_sample_plugin', // option_group for settings_fields() call.
			self::option_name(), // option_name.
			array( $this, 'sanitize_license_key' ) // sanitize_callback.
		);

		add_settings_section(
			'license', // id.
			__( 'Enable Updates', 'pmpro-pl-sample-plugin' ), // title.
			array( $this, 'settings_page_section_license' ), // content callback.
			$this->admin_page_slug() // page.
		);

		add_settings_field(
			'pmpro_pl_sample_plugin_license_key', // id.
			__( 'License Key', 'pmpro-pl-sample-plugin' ), // title.
			array( $this, 'license_key_field' ), // content callback.
			$this->admin_page_slug(), // page.
			'license' // section.
		);
	}

	/**
	 * Adds a menu item Settings > Sample Plugin where users can enter and
	 * activate their license key.
	 *
	 * @return void
	 */
	public function add_settings_page() {
		add_submenu_page(
			'options-general.php', // parent slug.
			__( 'Sample Plugin Settings', 'pmpro-pl-sample-plugin' ), // page <title>.
			__( 'Sample Plugin', 'pmpro-pl-sample-plugin' ), // menu title.
			'manage_options', // capability.
			$this->admin_page_slug(), // menu slug.
			array( $this, 'settings_page' ) // function to call.
		);
	}

	protected function admin_page_slug() {
		return 'pmpro_pl_sample_plugin';
	}

	/**
	 * Get the license key.
	 *
	 * @return string The license key.
	 */
	public static function get_license_key() {
		return get_option( self::option_name() );
	}

	public function license_key_field() {
		// Does the user have an active license key?
		$license_key    = self::get_license_key();
		$activator      = PMPRO_PL_Sample_Activator::get_instance();
		$license_status = $activator->get_status( $license_key );

		if ( empty( $license_key ) ) {
			// No. Show input field.
			echo '<input type="text" class="regular-text" name="pmpro_pl_sample_plugin_license_key" value="" />';
		} else {
			// Have a license. Show an obfuscated key and the license status.
			// Stash the license key in a hidden field so it can be submitted.
			printf(
				'<input type="text" class="regular-text code" style="letter-spacing: 2px;" disabled="disabled" value="%s" />'
				. ' <span class="license-status license-status-%s" title="%s">%s</span>'
				. '<input type="hidden" name="pmpro_pl_sample_plugin_license_key" value="%s" />',
				esc_html( $this->obfuscate_license_key( $license_key ) ),
				esc_attr( $license_status ),
				esc_attr( __( 'License Status', 'pmpro-pl-sample-plugin' ) ),
				esc_html( ucwords( $license_status ?? '' ) ),
				esc_html( $license_key )
			);
		}

		// Is the license active? Show Deactivate button.
		// If not active, show Delete License Key button. Could be expired.
		echo '<div class="license-key-action-buttons"><p>';
		if ( 'active' === $license_status ) {
			// Show Deactivate button.
			printf(
				'<button type="submit" name="submit" value="deactivate-license" id="deactivate-license" class="button button-secondary">%s</button>',
				esc_html__( 'Deactivate License', 'pmpro-pl-sample-plugin' )
			);
		} elseif ( ! empty( $license_key ) ) {
			// Show Delete License Key button.
			printf(
				'<button type="submit" name="submit" value="delete-license-key" id="delete-license-key" class="button button-secondary">%s</button>',
				esc_html__( 'Delete License Key', 'pmpro-pl-sample-plugin' )
			);
		}

		if ( 'expired' === $license_status ) {
			printf(
				' &nbsp;<a href="%s">%s</a>',
				esc_url( PMPRO_PL_Sample_Updater::get_store_url( PMPRO_PL_SAMPLE_PLUGIN_STORE_URL . '/membership-account/' ) ),
				esc_html__( 'Renew', 'pmpro-pl-sample-plugin' )
			);
		}
		echo '</p></div>';
	}

	protected function obfuscate_license_key( $license_key ) {
		if ( ! empty( $license_key ) ) {
			return str_replace(
				substr( $license_key, 0, 28 ),
				str_repeat( '*', 28 ),
				$license_key
			);
		}
		return '';
	}

	public static function option_name() {
		return 'pmpro_pl_sample_plugin_license_key';
	}

	public function sanitize_license_key( $license_key ) {
		$license_key = sanitize_text_field( $license_key );
		// Only for this settings group submission.
		if ( isset( $_POST['option_page'] ) && $_POST['option_page'] === 'pmpro_pl_sample_plugin' ) {
			check_admin_referer( 'pmpro_pl_sample_plugin-options' );

			$submit = isset( $_POST['submit'] ) ? sanitize_text_field( wp_unslash( $_POST['submit'] ) ) : '';
			if ( $submit === 'deactivate-license' ) {
				// Perform your deactivate call here.
				PMPRO_PL_Sample_Activator::get_instance()->deactivate_license( $license_key );
				return $license_key;
			}

			if ( $submit === 'delete-license-key' ) {
				return '';
			}
		}

		// User pressed Save Changes button.
		$activator      = PMPRO_PL_Sample_Activator::get_instance();
		$license_status = $activator->activate_license( $license_key );
		return $license_key;
	}

	/**
	 * settings_page
	 *
	 * @return void
	 */
	public function settings_page() {
		printf(
			'<div class="wrap"><h1>%s</h1>',
			esc_html__( 'Plugin Licensing Sample Plugin', 'pmpro-pl-sample-plugin' )
		);
		echo '<form method="post" action="options.php">';
		settings_fields( 'pmpro_pl_sample_plugin' );
		do_settings_sections( 'pmpro_pl_sample_plugin' );
		submit_button();
		echo '</form></div>';
	}

	public function settings_page_section_license() {
		// TODO This message should change based on the license status.
		printf(
			'<p>%s</p>',
			esc_html__( 'Enter your license key and press the Save Changes button to activate this site. Only sites with a valid license key will receive updates.', 'pmpro-pl-sample-plugin' )
		);
	}
}
new PMPRO_PL_Sample_Plugin();