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Edit File: licenses.php

<?php
/**
 * Seamless Donations by David Gewirtz, adopted from Allen Snook
 *
 * Lab Notes: http://zatzlabs.com/lab-notes/
 * Plugin Page: http://zatzlabs.com/seamless-donations/
 * Contact: http://zatzlabs.com/contact-us/
 *
 * Copyright (c) 2015-2022 by David Gewirtz
 *
 * @package WordPress
 */

// Exit if .php file accessed directly
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

add_action( 'cmb2_admin_init', 'seamless_donations_admin_licenses_menu' );

// LICENSES - MENU ////
function seamless_donations_admin_licenses_menu() {
	$args = array(
		'id'           => 'seamless_donations_tab_licenses_page',
		'title'        => 'Seamless Donations - Licenses',
		// page title
		'menu_title'   => 'Licenses',
		// title on left sidebar
		'tab_title'    => 'Licenses',
		// title displayed on the tab
		'object_types' => array( 'options-page' ),
		'option_key'   => 'seamless_donations_tab_licenses',
		'parent_slug'  => 'seamless_donations_tab_main',
		'tab_group'    => 'seamless_donations_tab_set',
		'save_button'  => 'Save Settings',
	);

// 'tab_group' property is supported in > 2.4.0.
	if ( version_compare( CMB2_VERSION, '2.4.0' ) ) {
		$args['display_cb'] = 'seamless_donations_cmb2_options_display_with_tabs';
	}

do_action( 'seamless_donations_tab_licenses_before', $args );

// call on button hit for page save
	add_action( 'admin_post_seamless_donations_tab_licenses', 'seamless_donations_tab_licenses_process_buttons' );

// clear previous error messages if coming from another page
	seamless_donations_clear_cmb2_submit_button_messages( $args['option_key'] );

$args             = apply_filters( 'seamless_donations_tab_licenses_menu', $args );
	$licenses_options = new_cmb2_box( $args );

// we don't need nonce verification here because all we're doing is checking to see
	// if we're on the page we expected to be on.
	// phpcs:ignore WordPress.Security.NonceVerification
	if ( isset( $_REQUEST['page'] ) && $_REQUEST['page'] == 'seamless_donations_tab_licenses' ) {
		$licenses_options = seamless_donations_admin_give_banner($licenses_options);
		seamless_donations_admin_licenses_section_data( $licenses_options );

do_action( 'seamless_donations_tab_licenses_after', $licenses_options );
	}
}

// LICENSES - SECTION - TEST ////
function seamless_donations_admin_licenses_section_data( $section_options ) {
	$section_desc = 'If you have purchased any premium extensions, you will be able to enter ';
	$section_desc .= 'their license keys here. Your active license key is required to run the extension ';
	$section_desc .= 'and will also enable you to get automatic updates for the duration of your license.';

$skip_addon_check = get_option( 'dgx_donate_legacy_addon_check' );
	if ( $skip_addon_check != 'on' ) {
		$pre_5_licenses = get_option( 'dgx_donate_5000_deactivated_addons' );

if ( $pre_5_licenses != false ) {
			if ( $pre_5_licenses != '' ) {
				$section_desc .= ' ';
				$section_desc .= 'WARNING: ';
				$section_desc .= 'The following add-ons are incompatible with this version of Seamless Donations and have been disabled: ';
				$section_desc .= $pre_5_licenses;
				$section_desc .= '. You will need to upgrade these add-ons before you can use them again.';
			}
		}
	}

$section_options->add_field(
		array(
			'name'        => 'License Activation',
			'id'          => 'seamless_donations_template_email_title',
			'type'        => 'title',
			'after_field' => $section_desc,
		)
	);

// $section_options = apply_filters (
	// 'seamless_donations_admin_licenses_section_registration', $section_options );

$section_options->add_field(
		array(
			'name'         => 'Licenses',
			'id'           => 'licenses_no_licenses',
			'type'         => 'licenses_html',
			'before_field' => __(
				'Nothing has been installed or activated that requires a license.',
				'seamless-donations'
			),
		)
	);

seamless_donations_sd4_plugin_filter_remove(); // clear out old registrations
	$section_options = apply_filters( 'seamless_donations_admin_licenses_section_registration_options', $section_options );
}

// LICENSES - PROCESS ////
function seamless_donations_tab_licenses_process_buttons() {
	// This is a callback that has to be passed the full array for consideration
	// phpcs:ignore WordPress.Security.NonceVerification
	$_POST = apply_filters( 'validate_page_slug_seamless_donations_tab_licenses', $_POST );
}