free-digital-downloads.php

<?php
/**
 * Plugin Name: Free Digital Downloads
 * Plugin URI:  https://aiordienow.com/products/free-digital-downloads
 * Description: Sell digital products, manage software licenses, and deliver downloads — completely free. No upsells, no premium tiers. Everything EDD charges $500/year for, yours at no cost.
 * Version:     1.0.0
 * Author:      AI Or Die Now
 * Author URI:  https://aiordienow.com
 * License:     GPL v2 or later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain: free-digital-downloads
 * Domain Path: /languages
 * Requires at least: 6.0
 * Requires PHP: 7.4
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

// Plugin constants.
define( 'FDD_VERSION', '1.0.0' );
define( 'FDD_FILE', __FILE__ );
define( 'FDD_DIR', plugin_dir_path( __FILE__ ) );
define( 'FDD_URL', plugin_dir_url( __FILE__ ) );
define( 'FDD_BASENAME', plugin_basename( __FILE__ ) );

/**
 * Main plugin class — singleton.
 */
final class Free_Digital_Downloads {

    private static $instance = null;

    public static function instance() {
        if ( null === self::$instance ) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    private function __construct() {
        $this->load_dependencies();
        $this->init_hooks();
    }

    private function load_dependencies() {
        // Core.
        require_once FDD_DIR . 'includes/post-types.php';
        require_once FDD_DIR . 'includes/taxonomies.php';
        require_once FDD_DIR . 'includes/meta-boxes.php';

        // Cart & Checkout.
        require_once FDD_DIR . 'includes/cart/cart.php';
        require_once FDD_DIR . 'includes/checkout/checkout.php';
        require_once FDD_DIR . 'includes/checkout/payments.php';

        // Downloads & Licensing.
        require_once FDD_DIR . 'includes/downloads/download-handler.php';
        require_once FDD_DIR . 'includes/downloads/file-protection.php';
        require_once FDD_DIR . 'includes/licensing/license-manager.php';
        require_once FDD_DIR . 'includes/licensing/update-server.php';

        // Discounts.
        require_once FDD_DIR . 'includes/discounts/discount-manager.php';

        // Emails.
        require_once FDD_DIR . 'includes/emails/email-handler.php';

        // Reports.
        require_once FDD_DIR . 'includes/reports/reports.php';

        // Reviews.
        require_once FDD_DIR . 'includes/reviews/reviews.php';

        // REST API.
        require_once FDD_DIR . 'includes/rest-api/endpoints.php';

        // Integrations (email services).
        require_once FDD_DIR . 'includes/integrations/integrations.php';

        // Admin.
        if ( is_admin() ) {
            require_once FDD_DIR . 'includes/admin/admin-pages.php';
            require_once FDD_DIR . 'includes/admin/settings.php';
        }
    }

    private function init_hooks() {
        add_action( 'init', array( $this, 'load_textdomain' ) );
        add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_frontend' ) );
        add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_admin' ) );

        // Product display template.
        add_filter( 'the_content', array( $this, 'product_content_template' ) );
    }

    public static function activate() {
        // These files must be loaded here because the activation hook fires
        // before plugins_loaded, so load_dependencies() hasn't run yet.
        require_once FDD_DIR . 'includes/post-types.php';
        require_once FDD_DIR . 'includes/taxonomies.php';
        require_once FDD_DIR . 'includes/downloads/file-protection.php';

        FDD_Post_Types::register();
        FDD_Taxonomies::register();
        FDD_DB::create_tables();
        FDD_Pages::create_pages();
        FDD_File_Protection::protect_uploads();
        flush_rewrite_rules();
    }

    public static function deactivate() {
        flush_rewrite_rules();
    }

    public function load_textdomain() {
        // WordPress 4.6+ auto-loads translations for plugins hosted on wordpress.org.
        // This is kept for backwards compatibility and custom translation loading.
        // phpcs:ignore PluginCheck.CodeAnalysis.DiscouragedFunctions.load_plugin_textdomainFound
        load_plugin_textdomain( 'free-digital-downloads', false, dirname( FDD_BASENAME ) . '/languages' );
    }

    public function enqueue_frontend() {
        // Only load on FDD-relevant pages.
        $is_fdd_page = is_singular( 'fdd_product' )
            || is_post_type_archive( 'fdd_product' )
            || is_tax( 'fdd_category' )
            || is_tax( 'fdd_tag' )
            || is_page( get_option( 'fdd_cart_page' ) )
            || is_page( get_option( 'fdd_checkout_page' ) )
            || is_page( get_option( 'fdd_receipt_page' ) )
            || is_page( get_option( 'fdd_account_page' ) );

        if ( ! $is_fdd_page ) {
            return;
        }

        wp_enqueue_style( 'fdd-frontend', FDD_URL . 'assets/css/frontend.css', array(), FDD_VERSION );
        wp_enqueue_script( 'fdd-frontend', FDD_URL . 'assets/js/frontend.js', array(), FDD_VERSION, array( 'in_footer' => true, 'strategy' => 'defer' ) );
        wp_localize_script( 'fdd-frontend', 'fdd_data', array(
            'ajax_url' => admin_url( 'admin-ajax.php' ),
            'nonce'    => wp_create_nonce( 'fdd_nonce' ),
            'cart_url' => get_permalink( get_option( 'fdd_cart_page' ) ),
        ) );

        // Stripe on checkout page only.
        if ( is_page( get_option( 'fdd_checkout_page' ) ) ) {
            $stripe_key = get_option( 'fdd_stripe_publishable_key', '' );
            if ( $stripe_key ) {
                // phpcs:ignore WordPress.WP.EnqueuedResourceParameters.MissingVersion -- Stripe.js is an external library with no version parameter.
                wp_enqueue_script( 'stripe-js', 'https://js.stripe.com/v3/', array(), null, true );
                wp_enqueue_script( 'fdd-checkout', FDD_URL . 'assets/js/checkout.js', array( 'stripe-js', 'fdd-frontend' ), FDD_VERSION, true );
                wp_localize_script( 'fdd-checkout', 'fdd_checkout', array(
                    'stripe_key' => $stripe_key,
                    'ajax_url'   => admin_url( 'admin-ajax.php' ),
                    'nonce'      => wp_create_nonce( 'fdd_nonce' ),
                ) );
            }
        }
    }

    public function enqueue_admin() {
        $screen = get_current_screen();
        if ( ! $screen ) {
            return;
        }
        if ( strpos( $screen->id, 'free-digital-downloads' ) === false && $screen->post_type !== 'fdd_product' ) {
            return;
        }
        wp_enqueue_style( 'fdd-admin', FDD_URL . 'assets/css/admin.css', array(), FDD_VERSION );
        wp_enqueue_script( 'fdd-admin', FDD_URL . 'assets/js/admin.js', array( 'jquery' ), FDD_VERSION, true );
        wp_enqueue_media();
    }

    /**
     * Append product details (price, cart, reviews) to single product content.
     */
    public function product_content_template( $content ) {
        if ( ! is_singular( 'fdd_product' ) || ! in_the_loop() || ! is_main_query() ) {
            return $content;
        }

        global $post;
        $product_id  = $post->ID;
        $price       = get_post_meta( $product_id, '_fdd_price', true );
        $sale_price  = get_post_meta( $product_id, '_fdd_sale_price', true );
        $files       = get_post_meta( $product_id, '_fdd_files', true );
        $licensing   = get_post_meta( $product_id, '_fdd_licensing_enabled', true );

        ob_start();
        echo wp_kses_post( $content );
        ?>
        <div class="fdd-product-details">
            <div class="fdd-product-pricing">
                <?php if ( $sale_price && (float) $sale_price > 0 ) : ?>
                    <span class="fdd-price-original"><s><?php echo esc_html( fdd_format_price( (float) $price ) ); ?></s></span>
                    <span class="fdd-price-current"><?php echo esc_html( fdd_format_price( (float) $sale_price ) ); ?></span>
                <?php elseif ( $price && (float) $price > 0 ) : ?>
                    <span class="fdd-price-current"><?php echo esc_html( fdd_format_price( (float) $price ) ); ?></span>
                <?php else : ?>
                    <span class="fdd-price-free"><?php esc_html_e( 'Free', 'free-digital-downloads' ); ?></span>
                <?php endif; ?>
            </div>

            <button class="fdd-add-to-cart button" data-product-id="<?php echo esc_attr( $product_id ); ?>">
                <?php
                if ( ! $price || (float) $price <= 0 ) {
                    esc_html_e( 'Download Free', 'free-digital-downloads' );
                } else {
                    esc_html_e( 'Add to Cart', 'free-digital-downloads' );
                }
                ?>
            </button>

            <?php if ( $licensing ) : ?>
                <p class="fdd-licensing-note"><?php esc_html_e( 'Includes a software license key for updates and support.', 'free-digital-downloads' ); ?></p>
            <?php endif; ?>

            <?php if ( is_array( $files ) && ! empty( $files ) ) : ?>
                <div class="fdd-file-list">
                    <h3><?php esc_html_e( 'Included Files', 'free-digital-downloads' ); ?></h3>
                    <ul>
                        <?php foreach ( $files as $file ) : ?>
                            <li><?php echo esc_html( $file['name'] ); ?></li>
                        <?php endforeach; ?>
                    </ul>
                </div>
            <?php endif; ?>
        </div>
        <?php
        return ob_get_clean();
    }
}

/**
 * Database table creation.
 */
class FDD_DB {

    public static function create_tables() {
        global $wpdb;
        $charset = $wpdb->get_charset_collate();

        require_once ABSPATH . 'wp-admin/includes/upgrade.php';

        // Orders.
        $orders = $wpdb->prefix . 'fdd_orders';
        dbDelta( "CREATE TABLE $orders (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            order_key varchar(64) NOT NULL DEFAULT '',
            customer_email varchar(255) NOT NULL,
            customer_name varchar(255) DEFAULT '',
            payment_gateway varchar(50) DEFAULT 'stripe',
            transaction_id varchar(255) DEFAULT '',
            status varchar(20) DEFAULT 'pending',
            subtotal decimal(10,2) DEFAULT 0,
            discount decimal(10,2) DEFAULT 0,
            total decimal(10,2) DEFAULT 0,
            currency varchar(3) DEFAULT 'USD',
            discount_code varchar(100) DEFAULT '',
            ip_address varchar(45) DEFAULT '',
            user_id bigint(20) unsigned DEFAULT 0,
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            updated_at datetime DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY  (id),
            KEY idx_email (customer_email),
            KEY idx_status (status),
            KEY idx_order_key (order_key),
            KEY idx_created (created_at)
        ) $charset;" );

        // Order items.
        $items = $wpdb->prefix . 'fdd_order_items';
        dbDelta( "CREATE TABLE $items (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            order_id bigint(20) unsigned NOT NULL,
            product_id bigint(20) unsigned NOT NULL,
            price_name varchar(255) DEFAULT '',
            price decimal(10,2) DEFAULT 0,
            quantity int(11) DEFAULT 1,
            PRIMARY KEY  (id),
            KEY idx_order (order_id),
            KEY idx_product (product_id)
        ) $charset;" );

        // Download log.
        $downloads = $wpdb->prefix . 'fdd_download_log';
        dbDelta( "CREATE TABLE $downloads (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            order_id bigint(20) unsigned DEFAULT 0,
            product_id bigint(20) unsigned NOT NULL,
            file_id varchar(255) DEFAULT '',
            customer_email varchar(255) NOT NULL,
            ip_address varchar(45) DEFAULT '',
            user_agent text,
            downloaded_at datetime DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY  (id),
            KEY idx_order (order_id),
            KEY idx_product (product_id),
            KEY idx_email (customer_email)
        ) $charset;" );

        // License keys.
        $licenses = $wpdb->prefix . 'fdd_licenses';
        dbDelta( "CREATE TABLE $licenses (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            license_key varchar(255) NOT NULL,
            order_id bigint(20) unsigned NOT NULL,
            product_id bigint(20) unsigned NOT NULL,
            customer_email varchar(255) NOT NULL,
            status varchar(20) DEFAULT 'active',
            activation_limit int(11) DEFAULT 1,
            activation_count int(11) DEFAULT 0,
            expires_at datetime DEFAULT NULL,
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY  (id),
            UNIQUE KEY idx_key (license_key),
            KEY idx_product (product_id),
            KEY idx_email (customer_email),
            KEY idx_status (status)
        ) $charset;" );

        // License activations.
        $activations = $wpdb->prefix . 'fdd_activations';
        dbDelta( "CREATE TABLE $activations (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            license_id bigint(20) unsigned NOT NULL,
            site_url varchar(500) NOT NULL,
            activated_at datetime DEFAULT CURRENT_TIMESTAMP,
            deactivated_at datetime DEFAULT NULL,
            PRIMARY KEY  (id),
            KEY idx_license (license_id)
        ) $charset;" );

        // Discount codes.
        $discounts = $wpdb->prefix . 'fdd_discounts';
        dbDelta( "CREATE TABLE $discounts (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            code varchar(100) NOT NULL,
            name varchar(255) DEFAULT '',
            type varchar(20) DEFAULT 'percent',
            amount decimal(10,2) DEFAULT 0,
            max_uses int(11) DEFAULT 0,
            use_count int(11) DEFAULT 0,
            min_total decimal(10,2) DEFAULT 0,
            product_ids text,
            starts_at datetime DEFAULT NULL,
            expires_at datetime DEFAULT NULL,
            status varchar(20) DEFAULT 'active',
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY  (id),
            UNIQUE KEY idx_code (code),
            KEY idx_status (status)
        ) $charset;" );

        // Email captures (for free downloads).
        $emails = $wpdb->prefix . 'fdd_email_captures';
        dbDelta( "CREATE TABLE $emails (
            id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
            email varchar(255) NOT NULL,
            product_id bigint(20) unsigned NOT NULL,
            ip_address varchar(45) DEFAULT '',
            download_count int(11) DEFAULT 0,
            created_at datetime DEFAULT CURRENT_TIMESTAMP,
            PRIMARY KEY  (id),
            KEY idx_email (email),
            KEY idx_product (product_id),
            UNIQUE KEY unique_email_product (email, product_id)
        ) $charset;" );

        update_option( 'fdd_db_version', FDD_VERSION );
    }
}

/**
 * Auto-create required pages on activation.
 */
class FDD_Pages {

    public static function create_pages() {
        $pages = array(
            'fdd_cart_page'     => array( 'title' => 'Cart', 'content' => '<!-- wp:shortcode -->[fdd_cart]<!-- /wp:shortcode -->' ),
            'fdd_checkout_page' => array( 'title' => 'Checkout', 'content' => '<!-- wp:shortcode -->[fdd_checkout]<!-- /wp:shortcode -->' ),
            'fdd_receipt_page'  => array( 'title' => 'Purchase Confirmation', 'content' => '<!-- wp:shortcode -->[fdd_receipt]<!-- /wp:shortcode -->' ),
            'fdd_account_page'  => array( 'title' => 'Your Downloads', 'content' => '<!-- wp:shortcode -->[fdd_account]<!-- /wp:shortcode -->' ),
        );

        foreach ( $pages as $option_key => $page ) {
            $existing = get_option( $option_key );
            if ( $existing && get_post_status( $existing ) === 'publish' ) {
                continue;
            }
            $page_id = wp_insert_post( array(
                'post_title'   => $page['title'],
                'post_content' => $page['content'],
                'post_status'  => 'publish',
                'post_type'    => 'page',
            ) );
            if ( $page_id && ! is_wp_error( $page_id ) ) {
                update_option( $option_key, $page_id );
            }
        }
    }
}

// Activation and deactivation hooks must be registered at file load time.
register_activation_hook( FDD_FILE, array( 'Free_Digital_Downloads', 'activate' ) );
register_deactivation_hook( FDD_FILE, array( 'Free_Digital_Downloads', 'deactivate' ) );

/**
 * Format a price with the correct currency symbol.
 */
function fdd_format_price( $amount ) {
    $currency = strtolower( get_option( 'fdd_currency', 'usd' ) );
    $symbols  = array( 'usd' => '$', 'eur' => "\xe2\x82\xac", 'gbp' => "\xc2\xa3" );
    $symbol   = $symbols[ $currency ] ?? '$';
    return $symbol . number_format( (float) $amount, 2 );
}

/**
 * Get the currency symbol.
 */
function fdd_currency_symbol() {
    $currency = strtolower( get_option( 'fdd_currency', 'usd' ) );
    $symbols  = array( 'usd' => '$', 'eur' => "\xe2\x82\xac", 'gbp' => "\xc2\xa3" );
    return $symbols[ $currency ] ?? '$';
}

// Boot the plugin.
function fdd_init() {
    return Free_Digital_Downloads::instance();
}
add_action( 'plugins_loaded', 'fdd_init' );