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name : PgCache_Flush.php
 <?php
namespace W3TC;

/**
 * W3 PgCache flushing
 */
class PgCache_Flush extends PgCache_ContentGrabber {
	/**
	 * Array of urls to flush
	 */
	private $queued_urls = array();
	private $queued_groups = array();
	private $queued_post_ids = array();
	private $flush_all_operation_requested = false;
	private $debug_purge = false;

	public function __construct() {
		parent::__construct();
		$this->debug_purge = $this->_config->get_boolean( 'pgcache.debug_purge' );
	}

	/**
	 * Flushes all caches
	 */
	public function flush() {
		if ( $this->debug_purge ) {
			Util_Debug::log_purge( 'pagecache', 'flush_all' );
		}

		$this->flush_all_operation_requested = true;
		return true;
	}

	public function flush_group( $group ) {
		if ( $this->debug_purge ) {
			Util_Debug::log_purge( 'pagecache', 'flush_group', $group );
		}

		$this->queued_groups[$group] = '*';
	}

	/**
	 * Flushes post cache
	 *
	 * @param integer $post_id
	 */
	public function flush_post( $post_id = null ) {
		if ( !$post_id ) {
			$post_id = Util_Environment::detect_post_id();
		}

		if ( !$post_id ) {
			return false;
		}

		global $wp_rewrite;   // required by many Util_PageUrls methods
		if ( empty( $wp_rewrite ) ) {
			if ( $this->debug_purge ) {
				Util_Debug::log_purge( 'pagecache', 'flush_post', array(
					'post_id' => $post_id,
					'error' => 'Post flush attempt before wp_rewrite initialization. Cant flush cache.'
				) );
			}

			error_log('Post flush attempt before wp_rewrite initialization. Cant flush cache.');
			return false;
		}

		// prevent multiple calculation of post urls
		$queued_post_id_key = Util_Environment::blog_id() . '.' . $post_id;
		if ( isset( $this->queued_post_ids[$queued_post_id_key] ) ) {
			return true;
		}
		$this->queued_post_ids[$queued_post_id_key] = '*';

		// calculate urls to purge
		$full_urls = array();
		$post = get_post( $post_id );
		$terms = array();

		$feeds = $this->_config->get_array( 'pgcache.purge.feed.types' );
		$limit_post_pages = $this->_config->get_integer( 'pgcache.purge.postpages_limit' );

		if ( $this->_config->get_string( 'pgcache.rest' ) == 'cache' ) {
			$this->flush_group( 'rest' );
		}

		if ( $this->_config->get_boolean( 'pgcache.purge.terms' ) ||
			$this->_config->get_boolean( 'pgcache.purge.feed.terms' ) ) {
			$taxonomies = get_post_taxonomies( $post_id );
			$terms = wp_get_post_terms( $post_id, $taxonomies );
			$terms = $this->_append_parent_terms( $terms, $terms );
		}

		$front_page = get_option( 'show_on_front' );

		// Home (Frontpage) URL
		if ( ( $this->_config->get_boolean( 'pgcache.purge.home' ) &&
				$front_page == 'posts' ) ||
			$this->_config->get_boolean( 'pgcache.purge.front_page' ) ) {
			$full_urls = array_merge( $full_urls,
				Util_PageUrls::get_frontpage_urls( $limit_post_pages ) );
		}

		// Home (Post page) URL
		if ( $this->_config->get_boolean( 'pgcache.purge.home' ) &&
			$front_page != 'posts' ) {
			$full_urls = array_merge( $full_urls,
				Util_PageUrls::get_postpage_urls( $limit_post_pages ) );
		}

		// Post URL
		if ( $this->_config->get_boolean( 'pgcache.purge.post' ) ) {
			$full_urls = array_merge( $full_urls,
				Util_PageUrls::get_post_urls( $post_id ) );
		}

		// Post comments URLs
		if ( $this->_config->get_boolean( 'pgcache.purge.comments' ) &&
			function_exists( 'get_comments_pagenum_link' ) ) {
			$full_urls = array_merge( $full_urls,
				Util_PageUrls::get_post_comments_urls( $post_id ) );
		}

		// Post author URLs
		if ( $this->_config->get_boolean( 'pgcache.purge.author' ) && $post ) {
			$full_urls = array_merge( $full_urls,
				Util_PageUrls::get_post_author_urls( $post->post_author,
					$limit_post_pages ) );
		}

		// Post terms URLs
		if ( $this->_config->get_boolean( 'pgcache.purge.terms' ) ) {
			$full_urls = array_merge( $full_urls,
				Util_PageUrls::get_post_terms_urls( $terms, $limit_post_pages ) );
		}

		// Daily archive URLs
		if ( $this->_config->get_boolean( 'pgcache.purge.archive.daily' ) && $post ) {
			$full_urls = array_merge( $full_urls,
				Util_PageUrls::get_daily_archive_urls( $post, $limit_post_pages ) );
		}

		// Monthly archive URLs
		if ( $this->_config->get_boolean( 'pgcache.purge.archive.monthly' ) && $post ) {
			$full_urls = array_merge( $full_urls,
				Util_PageUrls::get_monthly_archive_urls( $post, $limit_post_pages ) );
		}

		// Yearly archive URLs
		if ( $this->_config->get_boolean( 'pgcache.purge.archive.yearly' ) && $post ) {
			$full_urls = array_merge( $full_urls,
				Util_PageUrls::get_yearly_archive_urls( $post, $limit_post_pages ) );
		}

		// Feed URLs
		if ( $this->_config->get_boolean( 'pgcache.purge.feed.blog' ) ) {
			$full_urls = array_merge( $full_urls,
				Util_PageUrls::get_feed_urls( $feeds, null ) );
		}

		if ( $this->_config->get_boolean( 'pgcache.purge.feed.comments' ) ) {
			$full_urls = array_merge( $full_urls,
				Util_PageUrls::get_feed_comments_urls( $post_id, $feeds ) );
		}

		if ( $this->_config->get_boolean( 'pgcache.purge.feed.author' ) ) {
			$full_urls = array_merge( $full_urls,
				Util_PageUrls::get_feed_author_urls( $post->post_author, $feeds ) );
		}

		if ( $this->_config->get_boolean( 'pgcache.purge.feed.terms' ) ) {
			$full_urls = array_merge( $full_urls,
				Util_PageUrls::get_feed_terms_urls( $terms, $feeds ) );
		}

		// Purge selected pages
		if ( $this->_config->get_array( 'pgcache.purge.pages' ) ) {
			$pages = $this->_config->get_array( 'pgcache.purge.pages' );
			$full_urls = array_merge( $full_urls,
				Util_PageUrls::get_pages_urls( $pages ) );
		}

		// add mirror urls
		$full_urls = Util_PageUrls::complement_with_mirror_urls( $full_urls );
		$full_urls = apply_filters( 'pgcache_flush_post_queued_urls',
			$full_urls );

		if ( $this->debug_purge ) {
			Util_Debug::log_purge( 'pagecache', 'flush_post', $post_id,
				$full_urls );
		}

		// Queue flush
		if ( count( $full_urls ) ) {
			foreach ( $full_urls as $url )
				$this->queued_urls[$url] = '*';
		}

		return true;
	}

	/**
	 * Flush a single url
	 */
	public function flush_url( $url ) {
		$parts = parse_url( $url );
		$uri = ( isset( $parts['path'] ) ? $parts['path'] : '' ) .
			( isset( $parts['query'] ) ? '?' . $parts['query'] : '' );
		$group = $this->get_cache_group_by_uri( $uri );

		if ( $this->debug_purge ) {
			Util_Debug::log_purge( 'pagecache', 'flush_url', array(
				$url, $group ) );
		}

		$this->queued_urls[$url] = ( empty( $group ) ? '*' : $group );
	}

	/**
	 * Performs the actual flush at the end of request processing.
	 * Duplicate flushes avoided that way.
	 */
	public function flush_post_cleanup() {
		if ( $this->flush_all_operation_requested ) {
			if ( $this->_config->get_boolean( 'pgcache.debug' ) ) {
				self::log( 'flush all' );
			}

			$groups_to_flush = array( '' );
			if ( $this->_config->get_string( 'pgcache.rest' ) == 'cache' ) {
				$groups_to_flush[] = 'rest';
			}

			$groups_to_flush = apply_filters(
				'w3tc_pagecache_flush_all_groups', $groups_to_flush );

			foreach ( $groups_to_flush as $group ) {
				$cache = $this->_get_cache( $group );
				$cache->flush( $group );
			}

			$count = 999;
			$this->flush_all_operation_requested = false;
			$this->queued_urls = array();
		} else {
			$count = 0;
			if ( count( $this->queued_groups ) > 0 ) {
				$count += count( $this->queued_urls );
				foreach ( $this->queued_groups as $group => $flag ) {
					if ( $this->_config->get_boolean( 'pgcache.debug' ) ) {
						self::log( 'pgcache flush "' . $group . '" group' );
					}

					$cache = $this->_get_cache( $group );
					$cache->flush( $group );
				}
			}

			if ( count( $this->queued_urls ) > 0 ) {
				if ( $this->_config->get_boolean( 'pgcache.debug' ) ) {
					self::log( 'pgcache flush ' . $count . ' urls' );
				}

				$mobile_groups = $this->_get_mobile_groups();
				$referrer_groups = $this->_get_referrer_groups();
				$cookies = $this->_get_cookies();
				$encryptions = $this->_get_encryptions();
				$compressions = $this->_get_compressions();

				$caches = array(
					'*' => $this->_get_cache()
				);

				foreach ( $this->queued_urls as $url => $group ) {
					if ( !isset( $caches[$group] ) ) {
						$caches[$group] = $this->_get_cache( $group );
					}
					$this->_flush_url( $url, $caches[$group], $mobile_groups,
						$referrer_groups, $cookies, $encryptions, $compressions,
						$group == '*' ? '' : $group );
				}

				$count += count( $this->queued_urls );

				// Purge sitemaps if a sitemap option has a regex
				if ( $this->_config->get_string( 'pgcache.purge.sitemap_regex' ) ) {
					$cache = $this->_get_cache( 'sitemaps' );
					$cache->flush( 'sitemaps' );
					$count++;
				}

				$this->queued_urls = array();
			}
		}

		return $count;
	}

	/**
	 * Does the actual job - flushing of a single url cache entries
	 */
	private function _flush_url( $url, $cache, $mobile_groups, $referrer_groups,
		$cookies, $encryptions, $compressions, $group ) {
		if ( empty( $url ) ) {
			return;
		}

		foreach ( $mobile_groups as $mobile_group ) {
			foreach ( $referrer_groups as $referrer_group ) {
				foreach ( $cookies as $cookie ) {
					foreach ( $encryptions as $encryption ) {
						foreach ( $compressions as $compression ) {
							$page_keys = array();
							$page_keys[] = $this->_get_page_key(
								array(
									'useragent' => $mobile_group,
									'referrer' => $referrer_group,
									'cookie' => $cookie,
									'encryption' => $encryption,
									'compression' => $compression,
									'group' => $group
								),
								$url );

							$page_keys = apply_filters(
								'w3tc_pagecache_flush_url_keys', $page_keys );

							foreach ( $page_keys as $page_key ) {
								$cache->delete( $page_key, $group );
							}
						}
					}
				}
			}
		}
	}

	/**
	 * Returns array of mobile groups
	 */
	private function _get_mobile_groups() {
		$mobile_groups = array( '' );

		if ( $this->_mobile ) {
			$mobile_groups = array_merge( $mobile_groups, array_keys(
					$this->_mobile->get_groups() ) );
		}

		return $mobile_groups;
	}

	/**
	 * Returns array of referrer groups
	 */
	private function _get_referrer_groups() {
		$referrer_groups = array( '' );

		if ( $this->_referrer ) {
			$referrer_groups = array_merge( $referrer_groups, array_keys(
					$this->_referrer->get_groups() ) );
		}

		return $referrer_groups;
	}

	/**
	 * Returns array of cookies
	 */
	private function _get_cookies() {
		$cookies = array( '' );

		if ( $this->_config->get_boolean( 'pgcache.cookiegroups.enabled' ) ) {
			$cookies = array_merge( $cookies,
				array_keys( $this->_config->get_array( 'pgcache.cookiegroups.groups' ) ) );
		}

		return $cookies;
	}

	/**
	 * Returns array of encryptions
	 */
	private function _get_encryptions() {
		$is_https = ( substr( get_home_url(), 0, 5 ) == 'https' );

		$encryptions = array();

		if ( ! $is_https || $this->_config->get_boolean( 'pgcache.cache.ssl' ) )
			$encryptions[] = '';
		if ( $is_https || $this->_config->get_boolean( 'pgcache.cache.ssl' ) )
			$encryptions[] = 'ssl';

		return $encryptions;
	}

	private function _append_parent_terms( $terms, $terms_to_check_parents ) {
		$terms_to_check_parents = $terms;
		$ids = null;

		for ( ;; ) {
			$parent_ids = array();
			$taxonomies = array();

			foreach ( $terms_to_check_parents as $term ) {
				if ( $term->parent ) {
					$parent_ids[$term->parent] = '*';
					$taxonomies[$term->taxonomy] = '*';
				}
			}

			if ( empty( $parent_ids ) )
				return $terms;

			if ( is_null( $ids ) ) {
				// build a map of ids for faster check
				$ids = array();
				foreach ( $terms as $term )
					$ids[$term->term_id] = '*';
			} else {
				// append last new items to ids map
				foreach ( $terms_to_check_parents as $term )
					$ids[$term->term_id] = '*';
			}

			// build list to extract
			$include_ids = array();

			foreach ( $parent_ids as $id => $v ) {
				if ( !isset( $ids[$id] ) )
					$include_ids[] = $id;
			}

			if ( empty( $include_ids ) )
				return $terms;

			$new_terms = get_terms( array_keys( $taxonomies ),
				array( 'include' => $include_ids ) );

			$terms = array_merge( $terms, $new_terms );
			$terms_to_check_parents = $new_terms;
		}
	}
}
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