class-serviceworker.php

<?php

namespace nicomartin\ProgressiveWordPress;

class Serviceworker {

	public $capability = '';
	public $sw_path = '';
	public $sw_url = '';

	public function __construct() {
		$this->capability = pwp_get_instance()->Init->capability;
		$this->sw_path    = pwp_get_instance()->upload_dir . 'pwp-serviceworker.js';
		$this->sw_url     = pwp_get_instance()->upload_url . 'pwp-serviceworker.js';
		if ( is_multisite() ) {
			$this->sw_path = pwp_get_instance()->upload_dir . 'pwp-serviceworker-' . get_current_blog_id() . '.js';
			$this->sw_url  = pwp_get_instance()->upload_url . 'pwp-serviceworker-' . get_current_blog_id() . '.js';
		}
	}

	public function run() {

		add_action( 'admin_notices', [ $this, 'ssl_error_notice' ] );
		add_action( 'pwp_after_save', [ $this, 'regenerate' ] );
		add_action( 'pwp_on_update', [ $this, 'regenerate' ] );
		add_action( 'pwp_on_deactivate', [ $this, 'delete_serviceworker' ] );

		if ( file_exists( $this->sw_path ) ) {
			add_action( 'plugins_loaded', [ $this, 'register_service_worker' ] );
		}
	}

	/**
	 * Register service worker by using wp_register_service_worker();
	 */
	public function register_service_worker() {
		if ( function_exists( 'wp_register_service_worker' ) ) {

			/**
			 * Test: added a script where the dependency is registered afterwards
			 * Worls! the conts comes after the dependency
			 */
			wp_register_service_worker( 'progressive-wp-sw-test-deps', function () {
				return "const pwpshouldbe = 'after progressive-wp-sw';";
			}, [ 'progressive-wp-sw' ] );

			/**
			 * Test: add a different scope
			 * Works!
			 */
			wp_register_service_worker( 'progressive-wp-sw-test-scope', function () {
				return "const pwpanother = 'scope';";
			}, [], [ '/mysite/' ] );

			/**
			 * Progressive WP Serviceworker
			 */
			wp_register_service_worker( 'progressive-wp-sw', $this->sw_url );
		}
	}

	public function ssl_error_notice() {

		if ( is_ssl() ) {
			return;
		}

		$screen = get_current_screen();
		if ( PWP_SETTINGS_PARENT != $screen->parent_base ) {
			return;
		}

		echo '<div class="notice notice-error">';
		echo '<p>' . __( 'Your site has to be served over https to use progressive web app features.', 'pwp' ) . '</p>';
		echo '</div>';
	}

	/**
	 * Helpers
	 */

	public function regenerate() {

		$content_header = "'use strict';\n\n";
		$content_header .= "/**\n";
		$content_header .= " * generated by Progressive WordPress:\n";
		$content_header .= " * https://wordpress.org/plugins/progressive-wordpress/\n";
		$content_header .= " * by Nico Martin - https://nicomartin.ch\n";
		$content_header .= "**/\n";
		$content_header .= 'const version = \'{{time}}\';';

		$content = apply_filters( 'pwp_sw_content', '' );
		$path    = plugin_dir_path( pwp_get_instance()->file ) . 'Classes/Libs';
		require_once $path . '/minify/autoload.php';
		require_once $path . '/path-converter/autoload.php';
		$minifier = new \MatthiasMullie\Minify\JS( $content );

		$content = $minifier->minify();
		$content = $content_header . $content;

		/**
		 * check if not the same:
		 * this provides a way that the version will only be updated if there are changes in the sw-file.
		 */
		$current_content = '';
		if ( is_file( $this->sw_path ) ) {
			$current_content = file_get_contents( $this->sw_path );
		}
		$new_content_check = str_replace( '{{time}}', get_option( 'pwp_sw_time' ), $content );
		if ( $current_content == $new_content_check ) {
			return;
		}

		/**
		 * set new content
		 */
		$time    = time();
		$content = str_replace( '{{time}}', $time, $content );

		// Wrap content into IIFE.
		$content = "( function() {\n" . $content . "} )();\n";

		pwp_delete( $this->sw_path );
		$save = pwp_put_contents( $this->sw_path, $content );
		if ( ! $save ) {
			add_action( 'admin_notices', function () {
				echo '<div class="notice notice-error">';
				// translators: There was a problem generating your serviceworker file. Please check your permissions for ABSPATH
				echo '<p>' . sprintf( __( 'There was a problem generating your serviceworker file. Please check your permissions for %s', 'pwp' ), '<code>' . ABSPATH . '</code>' ) . '</p>';
				echo '</div>';
			} );

			return;
		} else {
			add_action( 'admin_notices', function () {
				echo '<div class="notice notice-success">';
				// translators: There was a problem generating your serviceworker file. Please check your permissions for ABSPATH
				echo '<p>' . __( 'ServiceWorker regenerated', 'pwp' ) . '</p>';
				echo '</div>';
			} );
		}
		update_option( 'pwp_sw_time', $time );
	}

	public function delete_serviceworker() {
		pwp_delete( $this->sw_path );
	}
}