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File name : endurance-page-cache.php
Content :
<?php
/*
Plugin Name: Endurance Page Cache
Description: Static file caching.
Version: 0.4
Author: Mike Hansen
Author URI: https://www.mikehansen.me/
License: GPLv2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
*/

// Do not access file directly!
if ( ! defined( 'WPINC' ) ) { die; }

define( 'EPC_VERSION', 0.4 );

if ( ! class_exists( 'Endurance_Page_Cache' ) ) {
	class Endurance_Page_Cache {
		function __construct() {
			$this->hooks();
			$this->cache_dir = WP_CONTENT_DIR . '/endurance-page-cache';
			$this->cache_exempt = array( 'wp-admin', '.', 'checkout', 'cart', 'wp-json', '%', '=', '@', '&', ':', ';' );
			if ( ! wp_next_scheduled( 'epc_purge' ) ) {
				wp_schedule_event( time() + ( HOUR_IN_SECONDS * 2 ), 'epc_weekly', 'epc_purge' );
			}
		}

		function hooks() {
			if ( $this->is_enabled() ) {
				add_action( 'init', array( $this, 'start' ) );
				add_action( 'shutdown', array( $this, 'finish' ) );

				add_filter( 'style_loader_src', array( $this, 'remove_wp_ver_css_js' ), 9999 );
				add_filter( 'script_loader_src', array( $this, 'remove_wp_ver_css_js' ), 9999 );

				add_filter( 'mod_rewrite_rules', array( $this, 'htaccess_contents' ), 77 );

				add_action( 'save_post', array( $this, 'save_post' ) );
				add_action( 'edit_terms', array( $this, 'edit_terms' ), 10, 2 );

				add_action( 'comment_post', array( $this, 'comment' ), 10, 2 );

				add_action( 'updated_option', array( $this, 'option_handler' ), 10, 3 );

				add_action( 'epc_purge', array( $this, 'purge_all' ) );

				add_action( 'wp_update_nav_menu', array( $this, 'purge_all' ) );

				add_action( 'admin_init', array( $this, 'do_purge_all' ) );
			}

			add_filter( 'plugin_action_links_' . plugin_basename( __FILE__ ), array( $this, 'status_link' ) );
		}

		function purge_cron( $schedules ) {
			$schedules['epc_weekly'] = array(
				'interval' => WEEK_IN_SECONDS,
				'display'  => esc_html__( 'Weekly' ),
			);
			return $schedules;
		}

		function option_handler( $option, $old_value, $new_value ) {
			$option_list = array(
				'widget', 'home', 'siteurl',
				'mm_coming_soon', 'active_plugins', 'template',
				'stylesheet', 'rewrite_rules', 'permalink_structure'
			);
			if ( in_array( $option, $option_list ) && $old_value !== $new_value ) {
				$this->purge_all();
			}
		}

		function comment( $comment_id, $comment_approved ) {
			$comment = get_comment( $comment_id );
			if ( property_exists( $comment, 'comment_post_ID' ) ) {
				$post_url = get_permalink( $comment->comment_post_ID );
				$this->purge_single( $post_url );
			}
		}

		function save_post( $post_id ) {
			$url = get_permalink( $post_id );
			$this->purge_single( $url );

			$taxonomies = get_post_taxonomies( $post_id );
			foreach ( $taxonomies as $taxonomy ) {
				$terms = get_the_terms( $post_id, $taxonomy );
				if ( is_array( $terms ) ) {
					foreach ( $terms as $term ) {
						$term_link = get_term_link( $term );
						$this->purge_single( $term_link );
					}
				}
			}

			if ( $post_type_archive = get_post_type_archive_link( get_post_type( $post_id ) ) ) {
				$this->purge_single( $post_type_archive );
			}

			$post_date = (array) json_decode( get_the_date( '{"\y":"Y","\m":"m","\d":"d"}', $post_id ) );
			if ( ! empty( $post_date ) ) {
				$this->purge_all( $this->uri_to_cache( get_year_link( $post_date['y'] ) ) );
			}
		}

		function edit_terms( $term_id, $taxonomy ) {
			$url = get_term_link( $term_id );
			$this->purge_single( $url );
		}

		function write( $page ) {
			$base = parse_url( trailingslashit( get_option( 'home' ) ), PHP_URL_PATH );

			if ( $this->is_cachable() && false === strpos( $page, 'nonce' ) && ! empty( $page ) ) {
				$this->path = WP_CONTENT_DIR . '/endurance-page-cache' . str_replace( get_option( 'home' ), '', esc_url( $_SERVER['REQUEST_URI'] ) );
				$this->path = str_replace( '/endurance-page-cache' . $base, '/endurance-page-cache/', $this->path );
				$this->path = str_replace( '//', '/', $this->path );

				if ( file_exists( $this->path . '_index.html' ) && filemtime( $this->path . '_index.html' ) > time() - HOUR_IN_SECONDS ) {
					return $page;
				}

				if ( ! is_dir( $this->path ) ) {
					mkdir( $this->path, 0755, true );
				}

				if ( false !== strpos( $page, '</html>' ) ) {
					$page .= "\n<!--Generated by Endurance Page Cache-->";
				}

				file_put_contents( $this->path . '_index.html', $page, LOCK_EX );
			} else {
				$nocache = get_transient( 'epc_nocache_pages', array() );
				$nocache[] = $_SERVER['REQUEST_URI'];
				delete_transient( 'epc_nocache_pages' );
				set_transient( 'epc_nocache_pages' , $nocache, DAY_IN_SECONDS );
			}
			return $page;
		}

		function purge_request( $uri ) {
			$siteurl = get_option( 'siteurl' );
			$uri = str_replace( $siteurl, $siteurl.':8080', $uri );
			$args = array(
				'method' => 'PURGE',
				'headers' => array(
					'host'   => str_replace( array( 'http://', 'https://' ), '', $siteurl ),
				)
			);
			wp_remote_request( $uri, $args );
		}

		function purge_all( $dir = null ) {
			if ( is_null( $dir ) || ! is_dir( $dir ) ) {
				$dir = WP_CONTENT_DIR . '/endurance-page-cache';
			}
			$dir = str_replace( '_index.html', '', $dir );
			if ( is_dir( $dir ) ) {
				$files = scandir( $dir );
				if ( is_array( $files ) ) {
					$files = array_diff( $files, array( '.', '..' ) );
				}

				if ( is_array( $files ) ) {
					foreach ( $files as $file ) {
						if ( is_dir( $dir . '/' . $file ) ) {
							$this->purge_all( $dir . '/' . $file );
						} else {
							unlink( $dir . '/' . $file );
						}
					}
					rmdir( $dir );
				}
			}
			$this->purge_request( get_option( 'siteurl' ) . '/*' );
		}

		function purge_single( $uri ) {
			$this->purge_request( $uri );
			$cache_file = $this->uri_to_cache( $uri );
			if ( file_exists( $cache_file ) ) {
				unlink( $cache_file );
			}
			if ( file_exists( $this->cache_dir . '/_index.html' ) ) {
				unlink( $this->cache_dir . '/_index.html' );
			}
		}

		function minify( $content ) {
			$content = str_replace( "\r", '', $content );
			$content = str_replace( "\n", '', $content );
			$content = str_replace( "\t", '', $content );
			$content = str_replace( '  ', ' ', $content );
			$content = trim( $content );
			return $content;
		}

		function uri_to_cache( $uri ) {
			$path = str_replace( get_site_url(), '', $uri );
			return $this->cache_dir . $path . '_index.html';
		}

		function is_cachable() {

			$return = true;

			$nocache = get_transient( 'epc_nocache_pages', array() );

			if ( defined( 'DONOTCACHEPAGE' ) && DONOTCACHEPAGE == true ) {
				$return = false;
			}

			if ( is_array( $nocache ) && in_array( $_SERVER['REQUEST_URI'], $nocache ) ) {
				$return = false;
			}

			if ( is_404() ) {
				$return = false;
			}

			if ( is_admin() ) {
				$return = false;
			}

			if ( ! get_option( 'permalink_structure' ) ) {
				$return = false;
			}

			if ( is_user_logged_in() ) {
				$return = false;
			}

			if ( isset( $_GET ) && ! empty( $_GET ) ) {
				$return = false;
			}

			if ( isset( $_POST ) && ! empty( $_POST ) ) {
				$return = false;
			}

			if ( is_feed() ) {
				$return = false;
			}

			if ( empty( $_SERVER['REQUEST_URI'] ) ) {
				$return = false;
			} else {
				$cache_exempt = apply_filters( 'epc_exempt_uri_contains', $this->cache_exempt );
				foreach ( $cache_exempt as $exclude ) {
					if ( false !== strpos( $_SERVER['REQUEST_URI'], $exclude ) ) {
						$return = false;
					}
				}
			}

			return apply_filters( 'epc_is_cachable', $return );
		}

		function start() {
			if ( $this->is_cachable() ) {
				ob_start( array( $this, 'write' ) );
			}
		}

		function finish() {
			if ( $this->is_cachable() ) {
				if ( ob_get_contents() ) {
					ob_end_clean();
				}
			}
		}

		function remove_wp_ver_css_js( $src ) {
			if ( strpos( $src, 'ver=' ) ) {
				$src = remove_query_arg( 'ver', $src );
			}
			return $src;
		}

		function htaccess_contents( $rules ) {
			$base = parse_url( trailingslashit( get_option( 'home' ) ), PHP_URL_PATH );
			$cache_url = $base . str_replace( get_option( 'home' ), '', WP_CONTENT_URL . '/endurance-page-cache' );
			$cache_url = str_replace( '//', '/', $cache_url );
			$additions = 'Options -Indexes
<IfModule mod_rewrite.c>
	RewriteEngine On
	RewriteBase ' . $base . '
	RewriteRule ^' . $cache_url . '/ - [L]
	RewriteCond %{REQUEST_METHOD} !POST
	RewriteCond %{QUERY_STRING} !.*=.*
	RewriteCond %{HTTP_COOKIE} !(wordpress_test_cookie|comment_author|wp\-postpass|wordpress_logged_in|wptouch_switch_toggle|wp_woocommerce_session_) [NC]
	RewriteCond %{DOCUMENT_ROOT}' . $cache_url . '/$1/_index.html -f
	RewriteRule ^(.*)$ ' . $cache_url . '/$1/_index.html [L]
</IfModule>' . "\n";
			return $additions . $rules;
		}

		function is_enabled() {

			$plugins = implode( ' ', get_option( 'active_plugins', array() ) );
			if ( strpos( $plugins, 'cach' ) || strpos( $plugins, 'wp-rocket' ) ) {
				return false;
			}

			$theme = array(
				'stylesheet' => get_option( 'stylesheet' ),
				'template' => get_option( 'template' ),
			);

			$incompatible_themes = array( 'headway' );

			if ( in_array( $theme['stylesheet'], $incompatible_themes ) || in_array( $theme['template'], $incompatible_themes ) ) {
				return false;
			}

			$cache_settings = get_option( 'mm_cache_settings' );
			if ( isset( $_GET['epc_toggle'] ) && is_admin() ) {
				$valid_values = array( 'enabled', 'disabled' );
				if ( in_array( $_GET['epc_toggle'], $valid_values ) ) {
					$cache_settings['page'] = $_GET['epc_toggle'];
					update_option( 'mm_cache_settings', $cache_settings );
					header( 'Location: ' . admin_url( 'plugins.php?plugin_status=mustuse' ) );
				}
			}
			if ( isset( $cache_settings['page'] ) && 'disabled' == $cache_settings['page'] ) {
				return false;
			} else {
				return true;
			}
		}

		function status_link( $links ) {
			if ( $this->is_enabled() ) {
				$links[] = '<a href="' . add_query_arg( array( 'epc_toggle' => 'disabled' ) ) . '">Disable</a>';
				$links[] = '<a href="' . add_query_arg( array( 'epc_purge_all' => 'true' ) ) . '">Purge Cache</a>';
			} else {
				$links[] = '<a href="' . add_query_arg( array( 'epc_toggle' => 'enabled' ) ) . '">Enable</a>';
			}
			return $links;
		}

		function do_purge_all() {
			if ( isset( $_GET['epc_purge_all'] ) ) {
				$this->purge_all();
				header( 'Location: ' . admin_url( 'plugins.php?plugin_status=mustuse' ) );
			}
		}
	}
	$epc = new Endurance_Page_Cache;
}
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