<?php
namespace W3TC;

class Extension_Genesis_Plugin {
	/**
	 * Request URI
	 *
	 * @var string
	 */
	private $_request_uri = '';
	private $_config;

	function __construct() {
		$this->_config = Dispatcher::config();
	}

	function run() {
		add_filter( 'w3tc_config_default_values', array(
				$this, 'w3tc_config_default_values' ) );

		add_action( 'w3tc_register_fragment_groups', array( $this, 'register_groups' ) );

		$this->_config = Dispatcher::config();

		if ( Util_Environment::is_w3tc_pro( $this->_config ) ) {
			if ( !is_admin() ) {
				/**
				 * Register the caching of content to specific hooks
				 */
				foreach ( array( 'genesis_header', 'genesis_footer', 'genesis_sidebar', 'genesis_loop', 'wp_head', 'wp_footer', 'genesis_comments', 'genesis_pings' ) as $hook ) {
					add_action( $hook, array( $this, 'cache_genesis_start' ), -999999999 );
					add_action( $hook, array( $this, 'cache_genesis_end' ), 999999999 );
				}
				foreach ( array( 'genesis_do_subnav', 'genesis_do_nav' ) as $filter ) {
					add_filter( $filter, array( $this, 'cache_genesis_filter_start' ), -999999999 );
					add_filter( $filter, array( $this, 'cache_genesis_filter_end' ), 999999999 );
				}
			}

			/**
			 * Since posts pages etc are cached individually need to be able to flush just those and not all fragment
			 */
			add_action( 'clean_post_cache', array( $this, 'flush_post_fragment' ) );
			add_action( 'clean_post_cache', array( $this, 'flush_terms_fragment' ), 0, 0 );

			$this->_request_uri = isset( $_SERVER['REQUEST_URI'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_URI'] ) ) : '';
		}
	}

	public function w3tc_config_default_values( $default_values ) {
		$default_values['genesis.theme'] = array(
			'wp_head' => '0',
			'genesis_header' => '1',
			'genesis_do_nav' => '0',
			'genesis_do_subnav' => '0',
			'loop_front_page' => '1',
			'loop_terms' => '1',
			'flush_terms' => '1',
			'loop_single' => '1',
			'loop_single_excluded' => '',
			'loop_single_genesis_comments' => '0',
			'loop_single_genesis_pings' => '0',
			'sidebar' => '0',
			'sidebar_excluded' => '',
			'genesis_footer' => '1',
			'wp_footer' => '0',
			'reject_logged_roles' => '1',
			'reject_logged_roles_on_actions' => array(
				'genesis_loop',
				'wp_head',
				'wp_footer',
			),
			'reject_roles' => array( 'administrator' )
		);

		return $default_values;
	}

	/**
	 * Start outputbuffering or return fragment on a per page/hook basis
	 */
	function cache_genesis_start() {
		$hook = current_filter();
		$keys = $this->_get_id_group( $hook );
		if ( is_null( $keys ) )
			return;
		list( $id, $group ) = $keys;
		w3tc_fragmentcache_start( $id, $group, $hook );
	}

	/**
	 * Store the output buffer per page/post hook basis.
	 */
	function cache_genesis_end() {
		$keys = $this->_get_id_group( current_filter() );
		if ( is_null( $keys ) )
			return;
		list( $id, $group ) = $keys;
		w3tc_fragmentcache_end( $id, $group, $this->_config->get_boolean( array( 'fragmentcache', 'debug' ) ) );
	}

	/**
	 * Start filter buffering and return filter result
	 */
	function cache_genesis_filter_start( $data ) {
		$hook = current_filter();
		$keys = $this->_get_id_group( $hook, strpos( $data, 'current' )!==false );
		if ( is_null( $keys ) )
			return $data;
		list( $id, $group ) = $keys;
		return w3tc_fragmentcache_filter_start( $id, $group, $hook, $data );
	}

	/**
	 * Store the filter result and return filter result.
	 */
	function cache_genesis_filter_end( $data ) {
		$keys = $this->_get_id_group( current_filter(), strpos( $data, 'current' )!==false );
		if ( is_null( $keys ) )
			return $data;
		list( $id, $group ) = $keys;
		return w3tc_fragmentcache_filter_end( $id, $group, $data );
	}

	/**
	 * Constructs the fragment grouping for a subgroup
	 *
	 * @param unknown $subgroup
	 * @param unknown $state
	 * @return string
	 */
	private function _genesis_group( $subgroup, $state = false ) {
		$postfix = '';
		if ( $state && is_user_logged_in() )
			$postfix = 'logged_in_';
		return ( $subgroup ? "genesis_fragment_{$subgroup}_" : 'genesis_fragment_' ) . $postfix;
	}

	/**
	 * Constructs the correct fragment group and id for the hook
	 *
	 * @param unknown $hook
	 * @param bool    $current_menu
	 * @return array|null
	 */
	private function _get_id_group( $hook, $current_menu = false ) {
		if ( $this->cannot_cache_current_hook() ) {
			return null;
		}
		switch ( true ) {
		case $keys = $this->generate_sidebar_keys():
			list( $group, $genesis_id ) = $keys;
			break;
		case $keys = $this->generate_genesis_loop_keys():
			list( $group, $genesis_id ) = $keys;
			break;
		case $keys = $this->generate_genesis_comments_pings_keys():
			list( $group, $genesis_id ) = $keys;
			break;
		case $keys = $this->generate_genesis_navigation_keys( $current_menu ):
			list( $group, $genesis_id ) = $keys;
			break;
		default:
			$group = $hook;
			$genesis_id = $this->get_page_slug();
			if ( is_paged() )
				$genesis_id .= $this->get_paged_page_key();
			break;
		}

		if ( $this->_cache_group( $group ) && !$this->_exclude_page( $group ) ) {
			return array( $genesis_id, $this->_genesis_group( $group, true ) );
		}

		return null;
	}

	/**
	 * Checks if the fragment group should be cached
	 *
	 * @param unknown $group
	 * @return array|bool|int|null|string
	 */
	private function _cache_group( $group ) {
		return $this->_config->get_string( array( 'genesis.theme', $group ) );
	}

	/**
	 * Checks if current page is excluded from caching
	 *
	 * @param unknown $group
	 * @return bool
	 */
	private function _exclude_page( $group ) {
		$reject_uri = $this->_config->get_array( array( 'genesis.theme', "{$group}_excluded" ) );

		if ( is_null( $reject_uri ) || !is_array( $reject_uri ) || empty( $reject_uri ) ) {
			return false;
		}

		$auto_reject_uri = array(
			'wp-login',
			'wp-register'
		);
		foreach ( $auto_reject_uri as $uri ) {
			if ( strstr( $this->_request_uri, $uri ) !== false ) {
				return true;
			}
		}

		$reject_uri = array_map( array( '\W3TC\Util_Environment', 'parse_path' ), $reject_uri );

		foreach ( $reject_uri as $expr ) {
			$expr = trim( $expr );
			$expr = str_replace( '~', '\~', $expr );
			if ( $expr != '' && preg_match( '~' . $expr . '~i', $this->_request_uri ) ) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Register the various fragments groups to be used. no_action is used since fragments requires actions.
	 */
	function register_groups() {
		//blog specific group and an array of actions that will trigger a flush of the group
		$groups = array (
			$this->_genesis_group( '' ) => array(
				'clean_post_cache',
				'update_option_sidebars_widgets',
				'wp_update_nav_menu_item' ),
			$this->_genesis_group( 'sidebar' ) => array(
				'update_option_sidebars_widgets' ),
			$this->_genesis_group( 'loop_single' ) => array(
				'no_action' ),
			$this->_genesis_group( 'loop_front_page' ) => array(
				'clean_post_cache' ),
			$this->_genesis_group( 'loop_terms' ) => array(
				'no_action' )
		);
		foreach ( $groups as $group => $actions )
			w3tc_register_fragment_group( $group, $actions, 3600 );
	}

	/**
	 * Flush the fragments connected to a post id
	 *
	 * @param unknown $post_ID
	 */
	function flush_post_fragment( $post_ID ) {
		$page_slug = $this->get_page_slug( $post_ID );
		$urls = Util_PageUrls::get_post_urls( $post_ID );
		$hooks = array( 'genesis_loop', 'genesis_comments', 'genesis_pings' );
		foreach ( $hooks as $hook ) {
			$genesis_id = $page_slug;
			$genesis_id = "{$hook}_{$genesis_id}";

			w3tc_fragmentcache_flush_fragment( $genesis_id, $this->_genesis_group( 'loop_single_logged_in' ) );
			w3tc_fragmentcache_flush_fragment( $genesis_id, $this->_genesis_group( 'loop_single' ) );
			for ( $page = 0; $page<=sizeof( $urls ); $page++ ) {
				$genesis_id = $page_slug;
				$genesis_id .= $this->get_paged_page_key( $page );
				$genesis_id = "{$hook}_{$genesis_id}";

				w3tc_fragmentcache_flush_fragment( $genesis_id, $this->_genesis_group( 'loop_single_logged_in' ) );
				w3tc_fragmentcache_flush_fragment( $genesis_id, $this->_genesis_group( 'loop_single' ) );
			}
		}
	}

	public function flush_terms_fragment() {
		if ( $this->_config->get_boolean( array( 'genesis.theme', 'flush_terms' ) ) ) {
			w3tc_fragmentcache_flush_group( 'loop_terms' );
		}
	}

	/**
	 *
	 *
	 * @return bool
	 */
	private function cannot_cache_current_hook() {
		if ( is_user_logged_in() && $this->_config->get_boolean( array( 'genesis.theme', 'reject_logged_roles' ) ) ) {
			$roles = $this->_config->get_array( array( 'genesis.theme', 'reject_roles' ) );
			if ( $roles ) {
				$hooks = $this->_config->get_array( array( 'genesis.theme', 'reject_logged_roles_on_actions' ) );
				$hook = current_filter();
				foreach ( $roles as $role ) {
					if ( $hooks && current_user_can( $role ) && in_array( $hook, $hooks ) ) {
						return true;
					}
				}
			}
		}
		return false;
	}

	/**
	 *
	 *
	 * @return array
	 */
	private function generate_genesis_loop_keys() {
		if ( ( $hook = current_filter() ) != 'genesis_loop' )
			return null;

		if ( is_front_page() ) {
			$group = 'loop_front_page';
		} elseif ( is_single() ) {
			$group = 'loop_single';
		} else {
			$group = 'loop_terms';
		}
		$genesis_id = $this->get_page_slug();
		if ( is_paged() )
			$genesis_id .= $this->get_paged_page_key();
		$genesis_id = "{$hook}_{$genesis_id}";

		return array( $group, $genesis_id );
	}

	/**
	 *
	 *
	 * @return array
	 */
	private function generate_sidebar_keys() {
		if ( strpos( $hook = current_filter(), 'sidebar' ) !== true )
			return null;

		$genesis_id = $hook;
		$group = 'sidebar';
		return array( $group, $genesis_id );
	}

	/**
	 *
	 *
	 * @return array|null
	 */
	private function generate_genesis_comments_pings_keys() {
		if ( ( $hook = current_filter() ) != 'genesis_comments' )
			return null;
		$group = 'loop_single';

		$genesis_id = $this->get_page_slug();
		if ( is_paged() )
			$genesis_id .= $this->get_paged_page_key();
		$genesis_id = "{$hook}_{$genesis_id}";

		return array( $group, $genesis_id );
	}

	/**
	 *
	 *
	 * @param string  $current_menu
	 * @return array|null
	 */
	private function generate_genesis_navigation_keys( $current_menu ) {
		if ( !( strpos( ( $hook = current_filter() ), '_nav' ) && $current_menu ) )
			return null;

		$genesis_id = $this->get_page_slug();
		if ( is_paged() )
			$genesis_id .= $this->get_paged_page_key();
		return array( $hook, $genesis_id );
	}

	private function get_page_slug( $post_ID = null ) {
		if ( $post_ID ) {
			$purl = get_permalink( $post_ID );
			return str_replace( '/', '-', trim( str_replace( home_url(), '', $purl ), "/" ) );
		}
		if ( is_front_page() )
			return 'front_page';
		return isset( $_SERVER['REQUEST_URI'] ) ? str_replace( '/', '-', trim( sanitize_text_field( wp_unslash( $_SERVER['REQUEST_URI'] ) ), '/' ) ) : '';
	}

	/**
	 *
	 *
	 * @param int|null $page
	 * @return string _pagenumber_
	 */
	private function get_paged_page_key( $page=null ) {
		if ( is_null( $page ) ) {
			global $wp_query;
			return '_' . $wp_query->query_vars['paged'] . '_';
		}

		return '_' . $page . '_';
	}
}

$p = new Extension_Genesis_Plugin();
$p->run();

if ( is_admin() ) {
	$p = new Extension_Genesis_Plugin_Admin();
	$p->run();
}

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