From fa71c7a216e39221a8050d5dc35f99e9eb4d3599 Mon Sep 17 00:00:00 2001
From: cadeyrn <cadeyrn@b8457f37-d9ea-0310-8a92-e5e31aec5664>
Date: Tue, 19 Mar 2013 10:16:59 +0000
Subject: [PATCH] trunk replaced with branch v1.0; merge was impossible; files
 added

git-svn-id: http://plugins.svn.wordpress.org/wp-ffpc/trunk@684134 b8457f37-d9ea-0310-8a92-e5e31aec5664
---
 uninstall.php             |  12 +
 wp-ffpc-abstract.php      | 534 ++++++++++++++++++++++++++++++
 wp-ffpc-acache.php        | 281 ++++++++++++++++
 wp-ffpc-admin.css         | 141 ++++++++
 wp-ffpc-backend.php       | 672 ++++++++++++++++++++++++++++++++++++++
 wp-ffpc-class.php         | 663 +++++++++++++++++++++++++++++++++++++
 wp-ffpc-nginx-sample.conf |  51 +++
 7 files changed, 2354 insertions(+)
 create mode 100644 uninstall.php
 create mode 100644 wp-ffpc-abstract.php
 create mode 100644 wp-ffpc-acache.php
 create mode 100644 wp-ffpc-admin.css
 create mode 100644 wp-ffpc-backend.php
 create mode 100644 wp-ffpc-class.php
 create mode 100644 wp-ffpc-nginx-sample.conf

diff --git a/uninstall.php b/uninstall.php
new file mode 100644
index 0000000..144627d
--- /dev/null
+++ b/uninstall.php
@@ -0,0 +1,12 @@
+<?php
+/**
+ * uninstall file for WP-FFPC; uninstall hook does not remove the databse options
+ */
+
+/* get the worker file */
+include_once ( 'wp-ffpc.php' );
+
+/* run uninstall function */
+$wp_ffpc->plugin_uninstall();
+
+?>
diff --git a/wp-ffpc-abstract.php b/wp-ffpc-abstract.php
new file mode 100644
index 0000000..b615918
--- /dev/null
+++ b/wp-ffpc-abstract.php
@@ -0,0 +1,534 @@
+<?php
+/**
+ * abstract base class of WP-* plugins from hello@petermolnar.eu
+ */
+
+if ( ! defined( 'WP_CONTENT_URL' ) )	define( 'WP_CONTENT_URL',	WP_SITEURL		. '/wp-content' );
+if ( ! defined( 'WP_CONTENT_DIR' ) )	define( 'WP_CONTENT_DIR',	ABSPATH			. 'wp-content' );
+if ( ! defined( 'WP_PLUGIN_URL' ) )		define( 'WP_PLUGIN_URL',	WP_CONTENT_URL	. '/plugins' );
+if ( ! defined( 'WP_PLUGIN_DIR' ) )		define( 'WP_PLUGIN_DIR',	WP_CONTENT_DIR	. '/plugins' );
+if ( ! defined( 'WPMU_PLUGIN_URL' ) )	define( 'WPMU_PLUGIN_URL',	WP_CONTENT_URL	. '/mu-plugins' );
+if ( ! defined( 'WPMU_PLUGIN_DIR' ) )	define( 'WPMU_PLUGIN_DIR',	WP_CONTENT_DIR	. '/mu-plugins' );
+
+if (!class_exists('WP_Plugins_Abstract')) {
+
+	/**
+	 * abstract class for common, required functionalities
+	 *
+	 * @var string $plugin_constant The name of the plugin, will be used with strings, names, etc.
+	 * @var array $options Plugin options array
+	 * @var array $defaults Default options array
+	 * @var int $status Save, delete, neutral status storage
+	 * @var boolean $network true if plugin is Network Active
+	 * @var string $settings_link Link for settings page
+	 * @var string $plugin_url URL of plugin directory to be used with url-like includes
+	 * @var string $plugin_dir Directory of plugin to be used with standard includes
+	 * @var string $plugin_file Filename of main plugin PHP file
+	 * @var string $plugin_name Name of the plugin
+	 * @var string $plugin_version Plugin version number
+	 * @var string $setting_page Setting page URL name
+	 * @var string $setting_slug Parent settings page slug
+	 * @var string $donation_link Donation link URL
+	 * @var string $button_save ID of save button in HTML form
+	 * @var string $button_delete ID of delete button in HTML form
+	 * @var int $capability Level of admin required to manage plugin settings
+	 * @var string $slug_save URL slug to present saved state
+	 * @var string $slug_delete URL slug to present delete state
+	 * @var string $broadcast_url URL base of broadcast messages
+	 * @var string donation_business_id Business ID for donation form
+	 * @var string $donation_business_name Business name for donation form
+	 * @var string $donation_item_name Donation item name for donation form
+	 * @var string donation_business_id Business ID for donation form
+	 * @var string $broadcast_message Name of the file to get broadcast message from the web
+	 *
+	 */
+	abstract class WP_Plugins_Abstract {
+
+		protected $plugin_constant;
+		protected $options = array();
+		protected $defaults = array();
+		protected $status = 0;
+		protected $network = false;
+		protected $settings_link = '';
+		protected $settings_slug = '';
+		protected $plugin_url;
+		protected $plugin_dir;
+		protected $plugin_file;
+		protected $plugin_name;
+		protected $plugin_version;
+		protected $plugin_settings_page;
+		protected $donation_link;
+		protected $button_save;
+		protected $button_delete;
+		public $capability = 10;
+		const slug_save = '&saved=true';
+		const slug_delete = '&deleted=true';
+		const broadcast_url = 'http://petermolnar.eu/broadcast/';
+		const donation_business_id = 'FA3NT7XDVHPWU';
+		protected $donation_business_name;
+		protected $donation_item_name;
+		protected $broadcast_message;
+
+		/**
+		* constructor
+		*
+		* @param string $plugin_constant General plugin identifier, same as directory & base PHP file name
+		* @param string $plugin_version Version number of the parameter
+		* @param string $plugin_name Readable name of the plugin
+		* @param mixed $defaults Default value(s) for plugin option(s)
+		* @param string $donation_link Donation link of plugin
+		*
+		*/
+		public function __construct( $plugin_constant, $plugin_version, $plugin_name, $defaults, $donation_link ) {
+
+			$this->plugin_constant = $plugin_constant;
+
+			$this->plugin_url = $this->replace_if_ssl ( WP_PLUGIN_URL ) . '/' . $this->plugin_constant . '/';
+			$this->plugin_dir = WP_PLUGIN_DIR. '/' . $this->plugin_constant . '/';
+			$this->plugin_file = $this->plugin_constant . '/' . $this->plugin_constant . '.php';
+			$this->plugin_version = $plugin_version;
+			$this->plugin_name = $plugin_name;
+			$this->defaults = $defaults;
+			$this->plugin_settings_page = $this->plugin_constant .'-settings';
+			$this->donation_link = $donation_link;
+			$this->button_save = $this->plugin_constant . '-save';
+			$this->button_delete = $this->plugin_constant . '-delete';
+			$this->broadcast_message = self::broadcast_url . $this->plugin_constant . '.message';
+			$this->donation_business_name = 'PeterMolnar_WordPressPlugins_' . $this->plugin_constant . '_HU';
+			$this->donation_item_name = $this->plugin_name;
+
+			/* we need network wide plugin check functions */
+			if ( ! function_exists( 'is_plugin_active_for_network' ) )
+				require_once( ABSPATH . 'wp-admin/includes/plugin.php' );
+
+			/* check if plugin is network-activated */
+			if ( @is_plugin_active_for_network ( $this->plugin_file ) ) {
+				$this->network = true;
+				$this->settings_slug = 'settings.php';
+			}
+			else {
+				$this->settings_slug = 'options-general.php';
+			}
+
+			/* set the settings page link string */
+			$this->settings_link = $this->settings_slug . '?page=' .  $this->plugin_settings_page;
+
+			/* initialize plugin, plugin specific init functions */
+			$this->plugin_init();
+
+			/* get the options */
+			$this->plugin_options_read();
+
+			/* setup plugin, plugin specific setup functions that need options */
+			$this->plugin_setup();
+
+			/* add admin styling */
+			if( is_admin() ) {
+				/* jquery ui tabs is provided by WordPress */
+				wp_enqueue_script ( "jquery-ui-tabs" );
+				wp_enqueue_script ( "jquery-ui-slider" );
+
+				/* additional admin styling */
+				$css_handle = $this->plugin_constant . '-admin-css';
+				$css_file = $this->plugin_constant . '-admin.css';
+				if ( @file_exists ( $this->plugin_dir . $css_file ) )
+				{
+					$css_src = $this->plugin_url . $css_file;
+					wp_register_style( $css_handle, $css_src, false, false, 'all' );
+					wp_enqueue_style( $css_handle );
+				}
+			}
+
+			register_activation_hook( $this->plugin_file , array( $this , 'plugin_activate') );
+			register_deactivation_hook( $this->plugin_file , array( $this , 'plugin_deactivate') );
+			register_uninstall_hook( $this->plugin_file , array( $this , 'plugin_uninstall') );
+
+			/* register settings pages */
+			if ( $this->network )
+				add_filter( "network_admin_plugin_action_links_" . $this->plugin_file, array( $this, 'plugin_settings_link' ) );
+			else
+				add_filter( "plugin_action_links_" . $this->plugin_file, array( $this, 'plugin_settings_link' ) );
+
+			/* register admin init, catches $_POST and adds submenu to admin menu */
+			if ( $this->network )
+				add_action('network_admin_menu', array( $this , 'plugin_admin_init') );
+			else
+				add_action('admin_menu', array( $this , 'plugin_admin_init') );
+		}
+
+		/**
+		 * activation hook function, to be extended
+		 */
+		abstract function plugin_activate();
+
+		/**
+		 * deactivation hook function, to be extended
+		 */
+		abstract function plugin_deactivate ();
+
+		/**
+		 * uninstall hook function, to be extended
+		 */
+		abstract function plugin_uninstall();
+
+		/**
+		 * first init hook function, to be extended, before options were read
+		 */
+		abstract function plugin_init();
+
+		/**
+		 * second init hook function, to be extended, after options were read
+		 */
+		abstract function plugin_setup();
+
+
+		/**
+		 * admin panel, the HTML usually
+		 */
+		abstract function plugin_admin_panel();
+
+		/**
+		 * admin init: save/delete setting, add admin panel call hook
+		 */
+		public function plugin_admin_init() {
+
+			/* save parameter updates, if there are any */
+			if ( isset( $_POST[ $this->button_save ] ) ) {
+				$this->plugin_options_save();
+				$this->status = 1;
+				header( "Location: ". $this->settings_link . self::slug_save );
+			}
+
+			/* delete parameters if requested */
+			if ( isset( $_POST[ $this->button_delete ] ) ) {
+				$this->plugin_options_delete();
+				$this->status = 2;
+				header( "Location: ". $this->settings_link . self::slug_delete );
+			}
+
+			/* load additional moves */
+			$this->plugin_hook_admin_init();
+
+			/* get broadcast message, if available */
+			$this->broadcast_message = @file_get_contents( $this->broadcast_message );
+
+			/* add submenu to settings pages */
+			add_submenu_page( $this->settings_slug, $this->plugin_name . __( ' options' , $this->plugin_constant ), $this->plugin_name, $this->capability, $this->plugin_settings_page, array ( $this , 'plugin_admin_panel' ) );
+		}
+
+		/**
+		 * to be extended
+		 *
+		 */
+		abstract function plugin_hook_admin_init();
+
+		/**
+		 * callback function to add settings link to plugins page
+		 *
+		 * @param array $links Current links to add ours to
+		 *
+		 */
+		public function plugin_settings_link ( $links ) {
+			$settings_link = '<a href="' . $this->settings_link . '">' . __( 'Settings', $this->plugin_constant ) . '</a>';
+			array_unshift( $links, $settings_link );
+			return $links;
+		}
+
+		/**
+		 * deletes saved options from database
+		 */
+		protected function plugin_options_delete () {
+			/* get the currently saved options */
+			if ( $this->network )
+				delete_site_option( $this->plugin_constant );
+			else
+				delete_option( $this->plugin_constant );
+
+			/* additional moves */
+			$this->plugin_hook_options_delete();
+		}
+
+		/**
+		 * hook to add functionality into plugin_options_read
+		 */
+		abstract function plugin_hook_options_delete ();
+
+		/**
+		 * reads options stored in database and reads merges them with default values
+		 */
+		protected function plugin_options_read () {
+			/* get the currently saved options */
+			if ( $this->network )
+				$options = get_site_option( $this->plugin_constant );
+			else
+				$options = get_option( $this->plugin_constant );
+
+			/* this is the point to make any migrations from previous versions */
+			$this->plugin_hook_options_migrate( $options );
+
+			/* map missing values from default */
+			foreach ( $this->defaults as $key => $default )
+				if ( !@array_key_exists ( $key, $options ) )
+					$options[$key] = $default;
+
+			/* removed unused keys, rare, but possible */
+			foreach ( array_keys ( $options ) as $key )
+				if ( !@array_key_exists( $key, $this->defaults ) )
+					unset ( $options[$key] );
+
+			/* any additional read hook */
+			$this->plugin_hook_options_read( $options );
+
+			$this->options = $options;
+		}
+
+		/**
+		 * hook to add functionality into plugin_options_read
+		 */
+		abstract function plugin_hook_options_read ( &$options );
+
+		/**
+		 * hook for parameter migration
+		 */
+		abstract function plugin_hook_options_migrate( &$options );
+
+		/**
+		 * used on update and to save current options to database
+		 *
+		 * @param boolean $activating [optional] true on activation hook
+		 *
+		 */
+		protected function plugin_options_save ( $activating = false ) {
+
+			/* only try to update defaults if it's not activation hook, $_POST is not empty and the post
+			   is ours */
+			if ( !$activating && !empty ( $_POST ) && isset( $_POST[ $this->button_save ] ) ) {
+				/* we'll only update those that exist in the defaults array */
+				$options = $this->defaults;
+
+				foreach ( $options as $key => $default )
+				{
+					/* $_POST element is available */
+					if ( !empty( $_POST[$key] ) ) {
+						$update = $_POST[$key];
+
+						/* get rid of slashes in strings, just in case */
+						if ( is_string ( $update ) )
+							$update = stripslashes($update);
+
+						$options[$key] = $update;
+					}
+					/* empty $_POST element: when HTML form posted, empty checkboxes a 0 input
+					   values will not be part of the $_POST array, thus we need to check
+					   if this is the situation by checking the types of the elements,
+					   since a missing value means update from an integer to 0
+					*/
+					elseif ( empty( $_POST[$key] ) && ( is_bool ( $default ) || is_int( $default ) ) ) {
+						$options[$key] = 0;
+					}
+				}
+
+				/* update the options array */
+				$this->options = $options;
+			}
+
+			/* set plugin version */
+			$this->options['version'] = $this->plugin_version;
+
+			/* call hook function for additional moves before saving the values */
+			$this->plugin_hook_options_save( $activating );
+
+			/* save options to database */
+			if ( $this->network )
+				update_site_option( $this->plugin_constant , $this->options );
+			else
+				update_option( $this->plugin_constant , $this->options );
+		}
+
+		/**
+		 * hook to add functionality into plugin_options_save
+		 */
+		abstract function plugin_hook_options_save ( $activating );
+
+		/**
+		 * sends message to sysog
+		 *
+		 * @param string $message message to add besides basic info
+		 * @param int $log_level [optional] Level of log, info by default
+		 *
+		 */
+		protected function log ( $message, $log_level = LOG_INFO ) {
+
+			if ( @is_array( $message ) || @is_object ( $message ) )
+				$message = serialize($message);
+
+			if (! $this->config['log'] )
+				return false;
+
+			switch ( $log_level ) {
+				case LOG_ERR :
+					if ( function_exists( 'syslog' ) )
+						syslog( $log_level , self::plugin_constant . $message );
+					/* error level is real problem, needs to be displayed on the admin panel */
+					throw new Exception ( $message );
+				break;
+				default:
+					if ( function_exists( 'syslog' ) && $this->config['debug'] )
+						syslog( $log_level , self::plugin_constant . $message );
+				break;
+			}
+
+		}
+
+		/**
+		 * replaces http:// with https:// in an url if server is currently running on https
+		 *
+		 * @param string $url URL to check
+		 *
+		 * @return string URL with correct protocol
+		 *
+		 */
+		protected function replace_if_ssl ( $url ) {
+			if ( isset( $_SERVER['HTTP_X_FORWARDED_PROTO'] ) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https' )
+				$_SERVER['HTTPS'] = 'on';
+
+			if ( isset($_SERVER['HTTPS']) && (( strtolower($_SERVER['HTTPS']) == 'on' )  || ( $_SERVER['HTTPS'] == '1' ) ))
+				$url = str_replace ( 'http://' , 'https://' , $url );
+
+			return $url;
+		}
+
+		/**
+		 * function to easily print a variable
+		 *
+		 * @param mixed $var Variable to dump
+		 * @param boolean $ret Return text instead of printing if true
+		 *
+		*/
+		protected function print_var ( $var , $ret = false ) {
+			if ( @is_array ( $var ) || @is_object( $var ) || @is_bool( $var ) )
+				$var = var_export ( $var, true );
+
+			if ( $ret )
+				return $var;
+			else
+				echo $var;
+		}
+
+		/**
+		 * print value of an element from defaults array
+		 *
+		 * @param mixed $e Element index of $this->defaults array
+		 *
+		 */
+		protected function print_default ( $e ) {
+			_e('Default : ', $this->plugin_constant);
+			$select = 'select_' . $e;
+			if ( @is_array ( $this->$select ) ) {
+				$x = $this->$select;
+				$this->print_var ( $x[ $this->defaults[ $e ] ] );
+			}
+			else {
+				$this->print_var ( $this->defaults[ $e ] );
+			}
+		}
+
+		/**
+		 * select options field processor
+		 *
+		 * @param elements
+		 *  array to build <option> values of
+		 *
+		 * @param $current
+		 *  the current active element
+		 *
+		 * @param $print
+		 *  boolean: is true, the options will be printed, otherwise the string will be returned
+		 *
+		 * @return
+		 * 	prints or returns the options string
+		 *
+		 */
+		protected function print_select_options ( $elements, $current, $valid = false, $print = true ) {
+			/*
+			foreach ($elements as $value => $name ) : ?>
+				<option value="<?php echo $value ?>" <?php selected( $value , $current ); ?>>
+					<?php echo $name ; ?>
+				</option>
+			<?php endforeach;
+			*/
+			if ( is_array ( $valid ) )
+				$check_disabled = true;
+			else
+				$check_disabled = false;
+
+			foreach ($elements as $value => $name ) {
+				//$disabled .= ( @array_key_exists( $valid[ $value ] ) && $valid[ $value ] == false ) ? ' disabled="disabled"' : '';
+				$opt .= '<option value="' . $value . '" ';
+				$opt .= selected( $value , $current );
+
+				// ugly tree level valid check to prevent array warning messages
+				if ( is_array( $valid ) && isset ( $valid [ $value ] ) && $valid [ $value ] == false )
+					$opt .= ' disabled="disabled"';
+
+				$opt .= '>';
+				$opt .= $name;
+				$opt .= "</option>\n";
+			}
+
+			if ( $print )
+				echo $opt;
+			else
+				return $opt;
+		}
+
+
+
+		protected function plugin_donation_form () {
+
+			?>
+			<script>
+				jQuery(document).ready(function($) {
+					jQuery(function() {
+						var select = $( "#amount" );
+						var slider = $( '<div id="donation-slider"></div>' ).insertAfter( select ).slider({
+							min: 1,
+							max: 8,
+							range: "min",
+							value: select[ 0 ].selectedIndex + 1,
+							slide: function( event, ui ) {
+								select[ 0 ].selectedIndex = ui.value - 1;
+							}
+						});
+						$( "#amount" ).change(function() {
+							slider.slider( "value", this.selectedIndex + 1 );
+						});
+					});
+
+				});
+			</script>
+
+			<form action="https://www.paypal.com/cgi-bin/webscr" method="post" class="<?php echo $this->plugin_constant ?>-donation">
+				<label for="amount"><?php _e( "This plugin helped your business? I'd appreciate a coffee in return :) Please!", $this->plugin_constant ); ?></label>
+				<select name="amount" id="amount">
+					<option value="3">3$</option>
+					<option value="5">5$</option>
+					<option value="10" selected="selected">10$</option>
+					<option value="15">15$</option>
+					<option value="30">30$</option>
+					<option value="42">42$</option>
+					<option value="75">75$</option>
+					<option value="100">100$</option>
+				</select>
+				<input type="hidden" id="cmd" name="cmd" value="_donations" />
+				<input type="hidden" id="tax" name="tax" value="0" />
+				<input type="hidden" id="business" name="business" value="<?php echo self::donation_business_id ?>" />
+				<input type="hidden" id="bn" name="bn" value="<?php echo $this->donation_business_name ?>" />
+				<input type="hidden" id="item_name" name="item_name" value="<?php _e('Donation for ', $this->plugin_constant ); echo $this->donation_item_name ?>" />
+				<input type="hidden" id="currency_code" name="currency_code" value="USD" />
+				<input type="submit" name="submit" value="<?php _e('Donate via PayPal', $this->plugin_constant ) ?>" class="button-secondary" />
+			</form>
+			<?php
+		}
+	}
+}
diff --git a/wp-ffpc-acache.php b/wp-ffpc-acache.php
new file mode 100644
index 0000000..bcc3a4d
--- /dev/null
+++ b/wp-ffpc-acache.php
@@ -0,0 +1,281 @@
+<?php
+/**
+ * advanced cache worker of WordPress plugin WP-FFPC
+ */
+
+/* check for WP cache enabled*/
+if ( !WP_CACHE )
+	return false;
+
+/* check for config */
+if (!isset($wp_ffpc_config))
+	return false;
+
+/* no cache for post request (comments, plugins and so on) */
+if ($_SERVER["REQUEST_METHOD"] == 'POST')
+	return false;
+
+/**
+ * Try to avoid enabling the cache if sessions are managed
+ * with request parameters and a session is active
+ */
+if (defined('SID') && SID != '')
+	return false;
+
+/* request uri */
+$wp_ffpc_uri = $_SERVER['REQUEST_URI'];
+
+/* no cache for uri with query strings, things usually go bad that way */
+if ( stripos($wp_ffpc_uri, '?') !== false)
+	return false;
+
+/* no cache for pages starting with /wp- like WP admin */
+if (stripos($wp_ffpc_uri, '/wp-') !== false)
+	return false;
+
+/* no cache for robots.txt */
+if ( stripos($wp_ffpc_uri, 'robots.txt') )
+	return false;
+
+/* multisite files can be too large for memcached */
+if ( function_exists('is_multisite') && stripos($wp_ffpc_uri, '/files/') )
+	if ( is_multisite() )
+		return false;
+
+/* check if config is network active: use network config */
+if (!empty ( $wp_ffpc_config['network'] ) )
+	$wp_ffpc_config = $wp_ffpc_config['network'];
+/* check if config is active for site : use site config */
+elseif ( !empty ( $wp_ffpc_config[ $_SERVER['HTTP_HOST'] ] ) )
+	$wp_ffpc_config = $wp_ffpc_config[ $_SERVER['HTTP_HOST'] ];
+/* plugin config not found :( */
+else
+	return false;
+
+/* no cache for for logged in users normally, only if enabled */
+if ( $wp_ffpc_config['cache_loggedin'] == 0 ) {
+	foreach ($_COOKIE as $n=>$v) {
+		// test cookie makes to cache not work!!!
+		if ($n == 'wordpress_test_cookie') continue;
+		// wp 2.5 and wp 2.3 have different cookie prefix, skip cache if a post password cookie is present, also
+		if ( (substr($n, 0, 14) == 'wordpressuser_' || substr($n, 0, 10) == 'wordpress_' || substr($n, 0, 12) == 'wp-postpass_') && !$wp_ffpc_config['cache_loggedin'] ) {
+			return false;
+		}
+	}
+}
+
+$wp_ffpc_redirect = null;
+$wp_ffpc_backend = new WP_FFPC_Backend( $wp_ffpc_config );
+
+if ( $wp_ffpc_backend->status() === false )
+	return false;
+
+$wp_ffpc_keys = array ( 'meta', 'data' );
+$wp_ffpc_values = array();
+
+foreach ( $wp_ffpc_keys as $key ) {
+	$value = $wp_ffpc_backend->get ( $wp_ffpc_backend->key ( $key ) );
+
+	if ( ! $value )
+	{
+		wp_ffpc_start();
+		return;
+	}
+	else
+	{
+		$wp_ffpc_values[ $key ] = $value;
+	}
+}
+
+/* serve cache 404 status */
+if ( $wp_ffpc_values['meta']['status'] == 404 ) {
+	header("HTTP/1.1 404 Not Found");
+	flush();
+	die();
+}
+
+/* server redirect cache */
+if ( $wp_ffpc_values['meta']['redirect'] ) {
+	header('Location: ' . $wp_ffpc_values['meta']['redirect'] );
+	flush();
+	die();
+}
+
+/* page is already cached on client side (chrome likes to do this, anyway, it's quite efficient) */
+if ( array_key_exists( "HTTP_IF_MODIFIED_SINCE" , $_SERVER ) && !empty( $wp_ffpc_values['meta']['lastmodified'] ) ) {
+	$if_modified_since = strtotime(preg_replace('/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"]));
+	/* check is cache is still valid */
+	if ( $if_modified_since >= $wp_ffpc_values['meta']['lastmodified'] ) {
+		header("HTTP/1.0 304 Not Modified");
+		flush();
+		die();
+	}
+}
+
+/* if we reach this point it means data was found & correct, serve it */
+header('Content-Type: ' . $wp_ffpc_values['meta']['mime']);
+
+/* don't allow browser caching of page */
+header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0, post-check=0, pre-check=0');
+header('Pragma: no-cache');
+
+/* expire at this very moment */
+header('Expires: ' . gmdate("D, d M Y H:i:s", time() ) . " GMT");
+
+/* if shortlinks were set */
+if (!empty ( $wp_ffpc_values['meta']['shortlink'] ) )
+	header( 'Link:<'. $wp_ffpc_values['meta']['shortlink'] .'>; rel=shortlink' );
+
+/* if last modifications were set (for posts & pages) */
+if ( !empty($wp_ffpc_values['meta']['lastmodified']) )
+	header( 'Last-Modified: ' . gmdate("D, d M Y H:i:s", $wp_ffpc_values['meta']['lastmodified'] ). " GMT" );
+
+/* pingback urls, if existx */
+if ( !empty( $wp_ffpc_values['meta']['pingback'] ) )
+	header( 'X-Pingback: ' . $wp_ffpc_values['meta']['pingback'] );
+
+/* for debugging */
+if ( $wp_ffpc_config['response_header'] )
+	header( 'X-Cache-Engine: WP-FFPC with ' . $wp_ffpc_config['cache_type'] );
+
+/* HTML data */
+echo $wp_ffpc_values['data'];
+flush();
+die();
+
+/**
+ * starts caching function
+ *
+ */
+function wp_ffpc_start( ) {
+	/* start object "colleting" and pass it the the actual storer function  */
+	ob_start('wp_ffpc_callback');
+}
+
+/**
+ * callback function for WordPress redirect urls
+ *
+ */
+function wp_ffpc_redirect_callback ($redirect_url, $requested_url) {
+	global $wp_ffpc_redirect;
+	$wp_ffpc_redirect = $redirect_url;
+	return $redirect_url;
+}
+
+/**
+ * write cache function, called when page generation ended
+ */
+function wp_ffpc_callback( $buffer ) {
+	global $wp_ffpc_config;
+	global $wp_ffpc_backend;
+	global $wp_ffpc_redirect;
+
+	/* no is_home = error */
+	if (!function_exists('is_home'))
+		return $buffer;
+
+	/* no <body> close tag = not HTML, don't cache */
+	if (stripos($buffer, '</body>') === false)
+		return $buffer;
+
+	/* reset meta to solve conflicts */
+	$meta = array();
+
+	/* trim unneeded whitespace from beginning / ending of buffer */
+	$buffer = trim( $buffer );
+
+	/* Can be a trackback or other things without a body.
+	   We do not cache them, WP needs to get those calls. */
+	if (strlen($buffer) == 0)
+		return '';
+
+	if ( is_home() )
+		$meta['type'] = 'home';
+	elseif (is_feed() )
+		$meta['type'] = 'feed';
+	elseif ( is_archive() )
+		$meta['type'] = 'archive';
+	elseif ( is_single() )
+		$meta['type'] = 'single';
+	elseif ( is_page() )
+		$meta['type'] = 'page';
+	else
+		$meta['type'] = 'unknown';
+
+	/* check if caching is disabled for page type */
+	$nocache_key = 'nocache_'. $meta['type'];
+
+	/* don't cache if prevented by rule, also, log it */
+	if ( $wp_ffpc_config[ $nocache_key ] == 1 ) {
+		return $buffer;
+	}
+
+	if ( is_404() )
+		$meta['status'] = 404;
+
+	/* redirect page */
+	if ( $wp_ffpc_redirect != null)
+		$meta['redirect'] =  $wp_ffpc_redirect;
+
+	/* feed is xml, all others forced to be HTML */
+	if ( is_feed() )
+		$meta['mime'] = 'text/xml;charset=';
+	else
+		$meta['mime'] = 'text/html;charset=';
+
+	/* set mimetype */
+	$meta['mime'] = $meta['mime'] . $wp_ffpc_config['charset'];
+
+	/* try if post is available
+		if made with archieve, last listed post can make this go bad
+	*/
+	global $post;
+	if ( !empty($post) && ( $meta['type'] == 'single' || $meta['type'] == 'page' ) && !empty ( $post->post_modified_gmt ) )
+	{
+		/* get last modification data */
+		$meta['lastmodified'] = strtotime ( $post->post_modified_gmt );
+
+		/* get shortlink, if possible */
+		if (function_exists('wp_get_shortlink'))
+		{
+			$shortlink = wp_get_shortlink( );
+			if (!empty ( $shortlink ) )
+				$meta['shortlink'] = $shortlink;
+		}
+	}
+
+	/* store pingback url if pingbacks are enabled */
+	if ( get_option ( 'default_ping_status' ) == 'open' )
+		$meta['pingback'] = get_bloginfo('pingback_url');
+
+	/* sync all http and https requests if enabled */
+	if ( $config['sync_protocols'] == '1' )
+	{
+		if ( isset( $_SERVER['HTTP_X_FORWARDED_PROTO'] ) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https' )
+			$_SERVER['HTTPS'] = 'on';
+
+		if ( isset($_SERVER['HTTPS']) && ( ( strtolower($_SERVER['HTTPS']) == 'on' )  || ( $_SERVER['HTTPS'] == '1' ) ) )
+		{
+			$sync_from = 'http://' . $_SERVER['SERVER_NAME'];
+			$sync_to = 'https://' . $_SERVER['SERVER_NAME'];
+		}
+		else
+		{
+			$sync_from = 'https://' . $_SERVER['SERVER_NAME'];
+			$sync_to = 'http://' . $_SERVER['SERVER_NAME'];
+		}
+
+		$buffer = str_replace ( $sync_from, $sync_to, $buffer );
+	}
+
+	$wp_ffpc_backend->set ( $wp_ffpc_backend->key ( 'meta' ) , $meta );
+	$wp_ffpc_backend->set ( $wp_ffpc_backend->key ( 'data' ) , $buffer );
+
+	/* vital for nginx, make no problem at other places */
+	header("HTTP/1.1 200 OK");
+
+	/* echoes HTML out */
+	return $buffer;
+}
+
+?>
diff --git a/wp-ffpc-admin.css b/wp-ffpc-admin.css
new file mode 100644
index 0000000..08ee5a5
--- /dev/null
+++ b/wp-ffpc-admin.css
@@ -0,0 +1,141 @@
+.plugin-admin dt {
+	margin-top: 2em;
+	font-weight:bold;
+}
+
+.plugin-admin fieldset {
+	display:block;
+	margin: 0;
+	padding: 0 1em 0 1em;
+	border: 1px solid #ccc;
+}
+
+.plugin-admin legend {
+	display: none;
+	visibility: hidden;
+}
+
+.plugin-admin .default {
+	display:block;
+	padding-left: 1em;
+	font-size:90%;
+	color:#666;
+}
+
+.plugin-admin .description {
+	display:block;
+}
+
+.plugin-admin .tabs {
+	padding:0;
+	margin: 0;
+	list-style-type: none;
+}
+
+.plugin-admin .tabs li  {
+	border-style: solid;
+	border-width: 1px 1px 1px 1px;
+	border-color: #ccc;
+	border-bottom-color: #ccc;
+	line-height: 120%;
+	display: inline-block;
+	padding: 0.5em 2em 0.5em 2em;
+	text-decoration: none;
+	margin-bottom: -1px;
+	-webkit-border-top-left-radius: 3px;
+	-webkit-border-top-right-radius: 3px;
+	border-top-left-radius: 3px;
+	border-top-right-radius: 3px;
+	background: #f1f1f1;
+	background-image: -webkit-gradient(linear,left bottom,left top,from(#ececec),to(#f9f9f9));
+	background-image: -webkit-linear-gradient(bottom,#ececec,#f9f9f9);
+	background-image: -moz-linear-gradient(bottom,#ececec,#f9f9f9);
+	background-image: -o-linear-gradient(bottom,#ececec,#f9f9f9);
+	background-image: linear-gradient(to top,#ececec,#f9f9f9);
+}
+
+.plugin-admin .tabs li a {
+	outline: none;
+	text-decoration: none;
+	font-size: 120%;
+}
+
+.plugin-admin .tabs li.ui-state-active {
+	background: #fff;
+	border-bottom-color: #fff;
+}
+
+.error p {
+	font-weight: bold;
+}
+
+.error-msg {
+	color: #990000;
+}
+
+.ok-msg {
+	color: #009900;
+}
+
+.clear {
+	clear:both;
+}
+
+.wp-ffpc-donation {
+	padding: 0.8em;
+	border: 1px solid #ccc;
+	background-color: #f6f6f6;
+	-webkit-border-radius: 3px;
+	border-radius: 3px;
+
+}
+
+.wp-ffpc-donation * {
+	display: inline;
+	line-height: 2em;
+}
+
+.wp-ffpc-donation .currency {
+	padding: 0 0 0 0.3em;
+
+}
+
+.wp-ffpc-donation .submit {
+	display: inline-block;
+	width: 74px;
+	height: 21px;
+}
+
+.wp-ffpc-donation .ui-slider {
+	position: relative;
+	text-align: left;
+	display: inline-block;
+	width: 16em;
+	margin: 0 2em 0 2em;
+	height: 0.4em;
+	background-color: #111;
+	border: 1px solid #ccc;
+	-webkit-border-radius: 3px;
+	border-radius: 3px;
+	background: #f1f1f1;
+}
+
+.ui-slider .ui-slider-handle {
+	position: absolute;
+	z-index: 2;
+	width: 1.2em;
+	height: 1.2em;
+	margin-top: -0.4em;
+	cursor: default;
+	border: 1px solid #ccc;
+	-webkit-border-radius: 3px;
+	border-radius: 3px;
+	background: #f1f1f1;
+	background-image: -webkit-gradient(linear,left bottom,left top,from(#ececec),to(#f9f9f9));
+	background-image: -webkit-linear-gradient(bottom,#ececec,#f9f9f9);
+	background-image: -moz-linear-gradient(bottom,#ececec,#f9f9f9);
+	background-image: -o-linear-gradient(bottom,#ececec,#f9f9f9);
+	background-image: linear-gradient(to top,#ececec,#f9f9f9);
+	outline: none;
+
+}
diff --git a/wp-ffpc-backend.php b/wp-ffpc-backend.php
new file mode 100644
index 0000000..d84c3b7
--- /dev/null
+++ b/wp-ffpc-backend.php
@@ -0,0 +1,672 @@
+<?php
+/**
+ * backend driver for WordPress plugin WP-FFPC
+ *
+ * supported storages:
+ *  - APC
+ *  - Memcached
+ *  - Memcache
+ *
+ */
+
+if (!class_exists('WP_FFPC_Backend')) {
+	/* __ only availabe if we're running from the inside of wordpress, not in advanced-cache.php phase */
+	if ( function_exists ( '__' ) ) {
+		function __translate__ ( $text, $domain ) { return __($text, $domain); }
+	}
+	else {
+		function __translate__ ( $text, $domain ) { return $text; }
+	}
+
+
+	/**
+	 *
+	 * @var array $key_prefixes Prefix keys for entries
+	 * @var mixed	$connection	Backend object storage variable
+	 * @var array	$config		Configuration settings array
+	 * @var boolean	$alive		Backend aliveness indicator
+	 * @var mixed	$status		Backend server status storage
+	 *
+	 */
+	class WP_FFPC_Backend {
+
+		const plugin_constant = 'wp-ffpc';
+		const network_key = 'network';
+		const id_prefix = 'wp-ffpc-id-';
+		const prefix = 'prefix-';
+		const host_separator  = ',';
+		const port_separator  = ':';
+		private $key_prefixes = array ( 'meta', 'data' );
+
+		private $connection = NULL;
+		private $options;
+		private $alive = false;
+		public $status;
+
+		/**
+		* constructor
+		*
+		* @param mixed $config Configuration options
+		*
+		*/
+		public function __construct( $config ) {
+
+			$this->options = $config;
+
+			/* no config, nothing is going to work */
+			if ( empty ( $this->options ) ) {
+				return false;
+			}
+
+			/* split hosts entry to servers */
+			$this->set_servers();
+
+			/* call backend initiator based on cache type */
+			$init = $this->proxy( 'init' );
+
+			$this->log ( __translate__(' init starting', self::plugin_constant ));
+			$this->$init();
+		}
+
+		/*********************** PUBLIC FUNCTIONS ***********************/
+
+		/**
+		 * build key to make requests with
+		 *
+		 * @param string $suffix suffix to add to prefix
+		 *
+		 */
+		public function key ( $suffix = 'meta' ) {
+			/* use the full accessed URL string as key, same will be generated by nginx as well
+			   we need a data and a meta key: data is string only with content, meta is not used in nginx */
+			if ( isset( $_SERVER['HTTP_X_FORWARDED_PROTO'] ) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https' )
+				$_SERVER['HTTPS'] = 'on';
+
+			$protocol = ( isset($_SERVER['HTTPS']) && ( ( strtolower($_SERVER['HTTPS']) == 'on' )  || ( $_SERVER['HTTPS'] == '1' ) ) ) ? 'https://' : 'http://';
+
+			return $suffix . '-' . $protocol . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
+		}
+
+
+		/**
+		 * public get function, transparent proxy to internal function based on backend
+		 *
+		 * @param string $key Cache key to get value for
+		 *
+		 * @return mixed False when entry not found or entry value on success
+		 */
+		public function get ( &$key ) {
+
+			/* look for backend aliveness, exit on inactive backend */
+			if ( ! $this->is_alive() )
+				return false;
+
+			/* log the current action */
+			$this->log ( __translate__('get ', self::plugin_constant ). $key );
+
+			/* proxy to internal function */
+			$internal = $this->proxy( 'get' );
+			$result = $this->$internal( $key );
+
+			if ( $result === false  )
+				$this->log ( __translate__( "failed to get entry: ", self::plugin_constant ) . $key );
+
+			return $result;
+		}
+
+		/**
+		 * public set function, transparent proxy to internal function based on backend
+		 *
+		 * @param string $key Cache key to set with ( reference only, for speed )
+		 * @param mixed $data Data to set ( reference only, for speed )
+		 *
+		 * @return mixed $result status of set function
+		 */
+		public function set ( &$key, &$data ) {
+
+			/* look for backend aliveness, exit on inactive backend */
+			if ( ! $this->is_alive() )
+				return false;
+
+			/* log the current action */
+			$this->log( __translate__('set ', self::plugin_constant ) . $key . __translate__(' expiration time: ', self::plugin_constant ) . $this->options['expire']);
+
+			/* proxy to internal function */
+			$internal = $this->options['cache_type'] . '_set';
+			$result = $this->$internal( $key, $data );
+
+			/* check result validity */
+			if ( $result === false )
+				$this->log ( __translate__('failed to set entry: ', self::plugin_constant ) . $key, LOG_WARNING );
+
+			return $result;
+		}
+
+		/**
+		 * public get function, transparent proxy to internal function based on backend
+		 *
+		 * @param string $key Cache key to invalidate, false mean full flush
+		 */
+		public function clear ( $post_id = false ) {
+
+			/* look for backend aliveness, exit on inactive backend */
+			if ( ! $this->is_alive() )
+				return false;
+
+			/* exit if no post_id is specified */
+			if ( empty ( $post_id ) && $this->options['invalidation_method'] != 0) {
+				$this->log ( __translate__('not clearing unidentified post ', self::plugin_constant ), LOG_WARNING );
+				return false;
+			}
+
+			/* if invalidation method is set to full, flush cache */
+			if ( $this->options['invalidation_method'] === 0 || empty ( $post_id ) ) {
+				/* log action */
+				$this->log ( __translate__('flushing cache', self::plugin_constant ) );
+
+				/* proxy to internal function */
+				$internal = $this->proxy ( 'flush' );
+				$result = $this->$internal();
+
+				if ( $result === false )
+					$this->log ( __translate__('failed to flush cache', self::plugin_constant ), LOG_WARNING );
+
+				return $result;
+			}
+
+			/* need permalink functions */
+			if ( !function_exists('get_permalink') )
+				include_once ( ABSPATH . 'wp-includes/link-template.php' );
+
+			/* get path from permalink */
+			$path = substr ( get_permalink( $post_id ) , 7 );
+
+			/* no path, don't do anything */
+			if ( empty( $path ) ) {
+				$this->log ( __translate__('unable to determine path from Post Permalink, post ID: ', self::plugin_constant ) . $post_id , LOG_WARNING );
+				return false;
+			}
+
+			if ( isset($_SERVER['HTTPS']) && ( ( strtolower($_SERVER['HTTPS']) == 'on' )  || ( $_SERVER['HTTPS'] == '1' ) ) )
+				$protocol = 'https://';
+			else
+				$protocol = 'http://';
+
+			$to_clear = array (
+				$this->options['prefix-meta'] . $protocol . $path,
+				$this->options['prefix-data'] . $protocol . $path,
+			);
+
+			$internal = $this->proxy ( 'clear' );
+			$this->$internal ( $to_clear );
+		}
+
+		/**
+		 * get backend aliveness
+		 *
+		 * @return array Array of configured servers with aliveness value
+		 *
+		 */
+		public function status () {
+
+			/* look for backend aliveness, exit on inactive backend */
+			if ( ! $this->is_alive() )
+				return false;
+
+			$internal = $this->proxy ( 'status' );
+				return $this->status;
+		}
+
+		/**
+		 * backend proxy function name generator
+		 *
+		 * @return string Name of internal function based on cache_type
+		 *
+		 */
+		private function proxy ( $method ) {
+			return $this->options['cache_type'] . '_' . $method;
+		}
+
+		/**
+		 * function to check backend aliveness
+		 *
+		 * @return boolean true if backend is alive, false if not
+		 *
+		 */
+		private function is_alive() {
+			if ( ! $this->alive ) {
+				$this->log ( __translate__("backend is not active, exiting function ", self::plugin_constant ) . __FUNCTION__, LOG_WARNING );
+				return false;
+			}
+
+			return true;
+		}
+
+		/**
+		 * split hosts string to backend servers
+		 *
+		 *
+		 */
+		private function set_servers () {
+			/* replace servers array in config according to hosts field */
+			$servers = explode( self::host_separator , $this->options['hosts']);
+
+			$options['servers'] = array();
+
+			foreach ( $servers as $snum => $sstring ) {
+
+				$separator = strpos( $sstring , self::port_separator );
+				$host = substr( $sstring, 0, $separator );
+				$port = substr( $sstring, $separator + 1 );
+
+				/* IP server */
+				if ( !empty ( $host )  && !empty($port) && is_numeric($port) ) {
+					$this->options['servers'][$sstring] = array (
+						'host' => $host,
+						'port' => $port
+					);
+				}
+			}
+
+		}
+
+		/**
+		 * get current array of servers
+		 *
+		 * @return array Server list in current config
+		 *
+		 */
+		public function get_servers () {
+			return $this->options['servers'];
+		}
+
+		/**
+		 * sends message to sysog
+		 *
+		 * @param mixed $message message to add besides basic info
+		 *
+		 */
+		public function log ( $message, $log_level = LOG_WARNING ) {
+
+			if ( @is_array( $message ) || @is_object ( $message ) )
+				$message = serialize($message);
+
+			if (! $this->options['log'] )
+				return false;
+
+			switch ( $log_level ) {
+				case LOG_ERR :
+					if ( function_exists( 'syslog' ) )
+						syslog( $log_level , self::plugin_constant . " with " . $this->options['cache_type'] . ' ' . $message );
+					/* error level is real problem, needs to be displayed on the admin panel */
+					throw new Exception ( $message );
+				break;
+				default:
+					if ( function_exists( 'syslog' ) && $this->options['debug'] )
+						syslog( $log_level , self::plugin_constant . " with " . $this->options['cache_type'] . ' ' . $message );
+				break;
+			}
+
+		}
+
+		/*********************** END PUBLIC FUNCTIONS ***********************/
+		/*********************** APC FUNCTIONS ***********************/
+		/**
+		 * init apc backend: test APC availability and set alive status
+		 */
+		private function apc_init () {
+			/* verify apc functions exist, apc extension is loaded */
+			if ( ! function_exists( 'apc_sma_info' ) ) {
+				$this->log ( __translate__('APC extension missing', self::plugin_constant ) );
+				return false;
+			}
+
+			/* verify apc is working */
+			if ( apc_sma_info() ) {
+				$this->log ( __translate__('backend OK', self::plugin_constant ) );
+				$this->alive = true;
+			}
+		}
+
+		/**
+		 * health checker for APC
+		 *
+		 * @return boolean Aliveness status
+		 *
+		 */
+		private function apc_status () {
+			return $this->alive;
+		}
+
+		/**
+		 * get function for APC backend
+		 *
+		 * @param string $key Key to get values for
+		 *
+		 * @return mixed Fetched data based on key
+		 *
+		*/
+		private function apc_get ( &$key ) {
+			return apc_fetch( $key );
+		}
+
+		/**
+		 * Set function for APC backend
+		 *
+		 * @param string $key Key to set with
+		 * @param mixed $data Data to set
+		 *
+		 * @return boolean APC store outcome
+		 */
+		private function apc_set (  &$key, &$data ) {
+			return apc_store( $key , $data , $this->options['expire'] );
+		}
+
+
+		/**
+		 * Flushes APC user entry storage
+		 *
+		 * @return boolean APC flush outcome status
+		 *
+		*/
+		private function apc_flush ( ) {
+			return apc_clear_cache('user');
+		}
+
+		/**
+		 * Removes entry from APC or flushes APC user entry storage
+		 *
+		 * @param mixed $keys Keys to clear, string or array
+		*/
+		private function apc_clear ( $keys ) {
+			/* make an array if only one string is present, easier processing */
+			if ( !is_array ( $keys ) )
+				$keys = array ( $keys );
+
+			foreach ( $keys as $key ) {
+				if ( ! apc_delete ( $key ) ) {
+					$this->log ( __translate__('Failed to delete APC entry: ', self::plugin_constant ) . $key, LOG_ERR );
+					//throw new Exception ( __translate__('Deleting APC entry failed with key ', self::plugin_constant ) . $key );
+				}
+				else {
+					$this->log ( __translate__( 'APC entry delete: ', self::plugin_constant ) . $key );
+				}
+			}
+		}
+
+		/*********************** END APC FUNCTIONS ***********************/
+
+		/*********************** MEMCACHED FUNCTIONS ***********************/
+		/**
+		 * init memcached backend
+		 */
+		private function memcached_init () {
+			/* Memcached class does not exist, Memcached extension is not available */
+			if (!class_exists('Memcached')) {
+				$this->log ( __translate__(' Memcached extension missing', self::plugin_constant ), LOG_ERR );
+				return false;
+			}
+
+			/* check for existing server list, otherwise we cannot add backends */
+			if ( empty ( $this->options['servers'] ) && ! $this->alive ) {
+				$this->log ( __translate__("Memcached servers list is empty, init failed", self::plugin_constant ), LOG_WARNING );
+				return false;
+			}
+
+			/* check is there's no backend connection yet */
+			if ( $this->connection === NULL ) {
+				/* persistent backend needs an identifier */
+				if ( $this->options['persistent'] == '1' )
+					$this->connection = new Memcached( self::plugin_constant );
+				else
+					$this->connection = new Memcached();
+
+				/* use binary and not compressed format, good for nginx and still fast */
+				$this->connection->setOption( Memcached::OPT_COMPRESSION , false );
+				//$this->connection->setOption( Memcached::OPT_BINARY_PROTOCOL , true );
+			}
+
+			/* check if initialization was success or not */
+			if ( $this->connection === NULL ) {
+				$this->log ( __translate__( 'error initializing Memcached PHP extension, exiting', self::prefix ) );
+				return false;
+			}
+
+			/* check if we already have list of servers, only add server(s) if it's not already connected */
+			$servers_alive = array();
+			if ( !empty ( $this->status ) ) {
+				$servers_alive = $this->connection->getServerList();
+				/* create check array if backend servers are already connected */
+				if ( !empty ( $servers ) ) {
+					foreach ( $servers_alive as $skey => $server ) {
+						$skey =  $server['host'] . ":" . $server['port'];
+						$servers_alive[ $skey ] = true;
+					}
+				}
+			}
+
+			/* adding servers */
+			foreach ( $this->options['servers'] as $server_id => $server ) {
+				/* reset server status to unknown */
+				$this->status[$server_id] = -1;
+
+				/* only add servers that does not exists already  in connection pool */
+				if ( !@array_key_exists($server_id , $servers_alive ) ) {
+					$this->connection->addServer( $server['host'], $server['port'] );
+					$this->log ( $server_id . __translate__(" added, persistent mode: ", self::plugin_constant ) . $this->options['persistent'] );
+				}
+			}
+
+			/* backend is now alive */
+			$this->alive = true;
+			$this->memcached_status();
+		}
+
+		/**
+		 * sets current backend alive status for Memcached servers
+		 *
+		 */
+		private function memcached_status () {
+			/* server status will be calculated by getting server stats */
+			$this->log ( __translate__("checking server statuses", self::plugin_constant ));
+			/* get servers statistic from connection */
+			$report =  $this->connection->getStats();
+
+			foreach ( $report as $server_id => $details ) {
+				/* reset server status to offline */
+				$this->status[$server_id] = 0;
+				/* if server uptime is not empty, it's most probably up & running */
+				if ( !empty($details['uptime']) ) {
+					$this->log ( $server_id . __translate__(" server is up & running", self::plugin_constant ));
+					$this->status[$server_id] = 1;
+				}
+			}
+
+		}
+
+		/**
+		 * get function for Memcached backend
+		 *
+		 * @param string $key Key to get values for
+		 *
+		*/
+		private function memcached_get ( &$key ) {
+			return $this->connection->get($key);
+		}
+
+		/**
+		 * Set function for Memcached backend
+		 *
+		 * @param string $key Key to set with
+		 * @param mixed $data Data to set
+		 *
+		 */
+		private function memcached_set ( &$key, &$data ) {
+			$result = $this->connection->set ( $key, $data , $this->options['expire']  );
+
+			/* if storing failed, log the error code */
+			if ( $result === false ) {
+				$code = $this->connection->getResultCode();
+				$this->log ( __translate__('unable to set entry ', self::plugin_constant ) . $key . __translate__( ', Memcached error code: ', self::plugin_constant ) . $code );
+				//throw new Exception ( __translate__('Unable to store Memcached entry ', self::plugin_constant ) . $key . __translate__( ', error code: ', self::plugin_constant ) . $code );
+			}
+
+			return $result;
+		}
+
+		/**
+		 *
+		 * Flush memcached entries
+		 */
+		private function memcached_flush ( ) {
+			return $this->connection->flush();
+		}
+
+
+		/**
+		 * Removes entry from Memcached or flushes Memcached storage
+		 *
+		 * @param mixed $keys String / array of string of keys to delete entries with
+		*/
+		private function memcached_clear ( $keys ) {
+
+			/* make an array if only one string is present, easier processing */
+			if ( !is_array ( $keys ) )
+				$keys = array ( $keys );
+
+			foreach ( $keys as $key ) {
+				$kresult = $this->connection->delete( $key );
+
+				if ( $kresult === false ) {
+					$code = $this->connection->getResultCode();
+					$this->log ( __translate__('unable to delete entry ', self::plugin_constant ) . $key . __translate__( ', Memcached error code: ', self::plugin_constant ) . $code );
+				}
+				else {
+					$this->log ( __translate__( 'entry deleted: ', self::plugin_constant ) . $key );
+				}
+			}
+		}
+		/*********************** END MEMCACHED FUNCTIONS ***********************/
+
+		/*********************** MEMCACHE FUNCTIONS ***********************/
+		/**
+		 * init memcache backend
+		 */
+		private function memcache_init () {
+			/* Memcached class does not exist, Memcache extension is not available */
+			if (!class_exists('Memcache')) {
+				$this->log ( __translate__('PHP Memcache extension missing', self::plugin_constant ), LOG_ERR );
+				return false;
+			}
+
+			/* check for existing server list, otherwise we cannot add backends */
+			if ( empty ( $this->options['servers'] ) && ! $this->alive ) {
+				$this->log ( __translate__("servers list is empty, init failed", self::plugin_constant ), LOG_WARNING );
+				return false;
+			}
+
+			/* check is there's no backend connection yet */
+			if ( $this->connection === NULL )
+				$this->connection = new Memcache();
+
+			/* check if initialization was success or not */
+			if ( $this->connection === NULL ) {
+				$this->log ( __translate__( 'error initializing Memcache PHP extension, exiting', self::prefix ) );
+				return false;
+			}
+
+			/* adding servers */
+			foreach ( $this->options['servers'] as $server_id => $server ) {
+				/* reset server status to unknown */
+				if ( $this->options['persistent'] == '1' )
+					$this->status[$server_id] = $this->connection->pconnect ( $server['host'] , $server['port'] );
+				else
+					$this->status[$server_id] = $this->connection->connect ( $server['host'] , $server['port'] );
+
+				$this->log ( $server_id . __translate__(" added, persistent mode: ", self::plugin_constant ) . $this->options['persistent'] );
+			}
+
+			/* backend is now alive */
+			$this->alive = true;
+			$this->memcache_status();
+		}
+
+		/**
+		 * check current backend alive status for Memcached
+		 *
+		 */
+		private function memcache_status () {
+			/* server status will be calculated by getting server stats */
+			$this->log ( __translate__("checking server statuses", self::plugin_constant ));
+			/* get servers statistic from connection */
+			foreach ( $this->options['servers'] as $server_id => $server ) {
+				$this->status[$server_id] = $this->connection->getServerStatus( $server['host'], $server['port'] );
+				if ( $this->status[$server_id] == 0 )
+					$this->log ( $server_id . __translate__(" server is down", self::plugin_constant ));
+				else
+					$this->log ( $server_id . __translate__(" server is up & running", self::plugin_constant ));
+			}
+		}
+
+		/**
+		 * get function for Memcached backend
+		 *
+		 * @param string $key Key to get values for
+		 *
+		*/
+		private function memcache_get ( &$key ) {
+			return $this->connection->get($key);
+		}
+
+		/**
+		 * Set function for Memcached backend
+		 *
+		 * @param string $key Key to set with
+		 * @param mixed $data Data to set
+		 *
+		 */
+		private function memcache_set ( &$key, &$data ) {
+			$result = $this->connection->set ( $key, $data , 0 , $this->options['expire'] );
+			return $result;
+		}
+
+		/**
+		 *
+		 * Flush memcached entries
+		 */
+		private function memcache_flush ( ) {
+			return $this->connection->flush();
+		}
+
+
+		/**
+		 * Removes entry from Memcached or flushes Memcached storage
+		 *
+		 * @param mixed $keys String / array of string of keys to delete entries with
+		*/
+		private function memcache_clear ( $keys ) {
+			/* make an array if only one string is present, easier processing */
+			if ( !is_array ( $keys ) )
+				$keys = array ( $keys );
+
+			foreach ( $keys as $key ) {
+				$kresult = $this->connection->delete( $key );
+
+				if ( $kresult === false )
+				{
+					$this->log ( __translate__('unable to delete entry ', self::plugin_constant ) . $key );
+				}
+				else
+				{
+					$this->log ( __translate__( 'entry deleted: ', self::plugin_constant ) . $key );
+				}
+			}
+		}
+
+		/*********************** END MEMCACHE FUNCTIONS ***********************/
+
+	}
+
+}
+
+?>
diff --git a/wp-ffpc-class.php b/wp-ffpc-class.php
new file mode 100644
index 0000000..7c0f758
--- /dev/null
+++ b/wp-ffpc-class.php
@@ -0,0 +1,663 @@
+<?php
+/**
+ * main class for WordPress plugin WP-FFPC
+ *
+ * supported storages:
+ *  - APC
+ *  - Memcached
+ *  - Memcache
+ *
+ */
+
+if ( ! class_exists( 'WP_FFPC' ) ) {
+
+	/* get the plugin abstract class*/
+	include_once ( 'wp-ffpc-abstract.php');
+	/* get the common functions class*/
+	include_once ( 'wp-ffpc-backend.php');
+
+	/**
+	 * main wp-ffpc class
+	 *
+	 * @var string $acache_config Configuration storage file location
+	 * @var string $acache_worker The advanced cache worker file location
+	 * @var string $acache The WordPress standard advanced cache location
+	 * @var array $select_cache_type Possible cache types array
+	 * @var array $select_invalidation_method Possible invalidation methods array
+	 * @var string $nginx_sample Nginx example config file location
+	 * @var array $select_cache_type Cache types string array
+	 * @var array $select_invalidation_method Invalidation methods string array
+	 *
+	 */
+	class WP_FFPC extends WP_Plugins_Abstract {
+		const host_separator  = ',';
+		const port_separator  = ':';
+		const donation_id_key = 'hosted_button_id=';
+		const global_config_var = '$wp_ffpc_config';
+		const slug_flush = '&flushed=true';
+		private $global_option = '';
+		private $global_config_key = '';
+		private $global_config = array();
+		private $global_saved = false;
+		private $acache_worker = '';
+		private $acache = '';
+		private $nginx_sample = '';
+		private $acache_backend = '';
+		private $button_flush;
+		protected $select_cache_type = array ();
+		protected $select_invalidation_method = array ();
+		protected $valid_cache_type = array ();
+
+
+		/**
+		 * init hook function runs before admin panel hook, themeing and options read
+		 */
+		public function plugin_init() {
+			/* advanced cache "worker" file */
+			$this->acache_worker = $this->plugin_dir . $this->plugin_constant . '-acache.php';
+			/* WordPress advanced-cache.php file location */
+			$this->acache = WP_CONTENT_DIR . '/advanced-cache.php';
+			/* nginx sample config file */
+			$this->nginx_sample = $this->plugin_dir . $this->plugin_constant . '-nginx-sample.conf';
+			/* backend driver file */
+			$this->acache_backend = $this->plugin_dir . $this->plugin_constant . '-backend.php';
+			/* flush button identifier */
+			$this->button_flush = $this->plugin_constant . '-flush';
+			/* global options identifier */
+			$this->global_option = $this->plugin_constant . '-global';
+
+			/* set global config key; here, because it's needed for migration */
+			if ( $this->network )
+				$this->global_config_key = 'network';
+			else
+				$this->global_config_key = $_SERVER['HTTP_HOST'];
+
+			/* cache type possible values array */
+			$this->select_cache_type = array (
+				'apc' => __( 'APC' , $this->plugin_constant ),
+				'memcache' => __( 'PHP Memcache' , $this->plugin_constant ),
+				'memcached' => __( 'PHP Memcached' , $this->plugin_constant ),
+			);
+
+			$this->valid_cache_type = array (
+				'apc' => function_exists( 'apc_sma_info' ) ? true : false,
+				'memcache' => class_exists ( 'Memcache') ? true : false,
+				'memcached' => class_exists ( 'Memcached') ? true : false,
+			);
+
+			/* invalidation method possible values array */
+			$this->select_invalidation_method = array (
+				0 => __( 'flush cache' , $this->plugin_constant ),
+				1 => __( 'only modified post' , $this->plugin_constant ),
+			);
+
+		}
+
+		/**
+		 * additional init, steps that needs the plugin  options
+		 *
+		 */
+		public function plugin_setup () {
+
+			/* initiate backend */
+			$this->backend = new WP_FFPC_Backend ( $this->options );
+
+			/* get all available post types */
+			$post_types = get_post_types( );
+
+			/* cache invalidation hooks */
+			foreach ( $post_types as $post_type ) {
+				add_action( 'new_to_publish_' .$post_type , array( $this->backend , 'clear' ), 0 );
+				add_action( 'draft_to_publish' .$post_type , array( $this->backend , 'clear' ), 0 );
+				add_action( 'pending_to_publish' .$post_type , array( $this->backend , 'clear' ), 0 );
+				add_action( 'private_to_publish' .$post_type , array( $this->backend , 'clear' ), 0 );
+				add_action( 'publish_' . $post_type , array( $this->backend , 'clear' ), 0 );
+			}
+
+			/* invalidation on some other ocasions as well */
+			add_action( 'switch_theme', array( $this->backend , 'clear' ), 0 );
+			add_action( 'deleted_post', array( $this->backend , 'clear' ), 0 );
+			add_action( 'edit_post', array( $this->backend , 'clear' ), 0 );
+
+			/* add filter for catching canonical redirects */
+			add_filter('redirect_canonical', 'wp_ffpc_redirect_callback', 10, 2);
+
+		}
+
+		/**
+		 * activation hook function, to be extended
+		 */
+		public function plugin_activate() {
+			/* we leave this empty to avoid not detecting WP network correctly */
+		}
+
+		/**
+		 * deactivation hook function, to be extended
+		 */
+		public function plugin_deactivate () {
+			/* remove current site config from global config */
+			$this->update_global_config( true );
+		}
+
+		/**
+		 * uninstall hook function, to be extended
+		 */
+		public function plugin_uninstall( $delete_options = true ) {
+			/* delete advanced-cache.php file */
+			unlink ( $this->acache );
+
+			/* delete site settings */
+			if ( $delete_options ) {
+				$this->plugin_options_delete ();
+			}
+		}
+
+		/**
+		 * admin panel, the admin page displayed for plugin settings
+		 */
+		public function plugin_admin_panel() {
+			/**
+			 * security, if somehow we're running without WordPress security functions
+			 */
+			if( ! function_exists( 'current_user_can' ) || ! current_user_can( 'manage_options' ) ){
+				die( );
+			}
+			?>
+
+			<div class="wrap">
+
+			<script>
+				jQuery(document).ready(function($) {
+					jQuery( "#<?php echo $this->plugin_constant ?>-settings" ).tabs();
+				});
+			</script>
+
+			<?php
+
+			$this->plugin_donation_form();
+			/**
+			 * if options were saved, display saved message
+			 */
+			if ( ! empty( $this->broadcast_message ) ) : ?>
+				<div class="updated"><?php echo $this->broadcast_message; ?></div>
+			<?php endif;
+
+			/**
+			 * if options were saved, display saved message
+			 */
+			if ($_GET['saved']=='true' || $this->status == 1) : ?>
+				<div class='updated settings-error'><p><strong><?php _e( 'Settings saved.' , $this->plugin_constant ) ?></strong></p></div>
+			<?php endif;
+
+			/**
+			 * if options were delete, display delete message
+			 */
+			if ($_GET['deleted']=='true' || $this->status == 2) : ?>
+				<div class='error'><p><strong><?php _e( 'Plugin options deleted.' , $this->plugin_constant ) ?></strong></p></div>
+			<?php endif;
+
+			/**
+			 * if options were saved
+			 */
+			if ($_GET['flushed']=='true' || $this->status == 3) : ?>
+				<div class='updated settings-error'><p><strong><?php _e( "Cache flushed." , $this->plugin_constant ); ?></strong></p></div>
+			<?php endif;
+
+			/**
+			 * the admin panel itself
+			 */
+			?>
+
+			<h2><?php echo $this->plugin_name ; _e( ' settings', $this->plugin_constant ) ; ?></h2>
+
+			<?php if ( ! WP_CACHE ) : ?>
+				<div class="error"><p><?php _e("WP_CACHE is disabled, plugin will not work that way. Please add define `( 'WP_CACHE', true );` in wp-config.php", $this->plugin_constant ); ?></p></div>
+			<?php endif; ?>
+
+			<?php if ( ! $this->global_saved ) : ?>
+				<div class="error"><p><?php _e("WARNING: plugin settings are not yet saved for the site, please save settings!", $this->plugin_constant); ?></p><p><?php _e( "Technical information: the configuration array is not present in the global configuration." , $this->plugin_constant ) ?></p></div>
+			<?php endif; ?>
+
+			<?php if ( ! file_exists ( $this->acache ) ) : ?>
+				<div class="error"><p><?php _e("WARNING: advanced cache file is yet to be generated, please save settings!", $this->plugin_constant); ?></p><p><?php _e( "Technical information: please check if location is writable: " . $this->acache , $this->plugin_constant ) ?></p></div>
+			<?php endif; ?>
+
+			<?php if ( $this->options['cache_type'] == 'memcached' && !class_exists('Memcached') ) : ?>
+				<div class="error"><p><?php _e('ERROR: Memcached cache backend activated but no PHP memcached extension was found.', $this->plugin_constant); ?></p></div>
+			<?php endif; ?>
+
+			<?php if ( $this->options['cache_type'] == 'memcache' && !class_exists('Memcache') ) : ?>
+				<div class="error"><p><?php _e('ERROR: Memcache cache backend activated but no PHP memcache extension was found.', $this->plugin_constant); ?></p></div>
+			<?php endif; ?>
+
+			<?php
+				/* get the current runtime configuration for memcache in PHP because Memcache in binary mode is really problematic */
+				if ( extension_loaded ( 'memcache' )  )
+				{
+					$memcache_settings = ini_get_all( 'memcache' );
+					if ( !empty ( $memcache_settings ) && $this->options['cache_type'] == 'memcache' )
+					{
+						$memcache_protocol = strtolower($memcache_settings['memcache.protocol']['local_value']);
+						if ( $memcached_protocol == 'binary' ) :
+						?>
+						<div class="error"><p><?php _e('WARNING: Memcache extension is configured to use binary mode. This is very buggy and the plugin will most probably not work correctly. <br />Please consider to change either to ASCII mode or to Memcached extension.', $this->plugin_constant ); ?></p></div>
+						<?php
+						endif;
+					}
+				}
+			?>
+			<div class="updated">
+				<p><strong><?php _e ( 'Driver: ' , $this->plugin_constant); echo $this->options['cache_type']; ?></strong></p>
+				<?php
+					/* only display backend status if memcache-like extension is running */
+					if ( strstr ( $this->options['cache_type'], 'memcache') ) :
+						?><p><?php
+						_e( '<strong>Backend status:</strong><br />', $this->plugin_constant );
+
+						/* we need to go through all servers */
+						$servers = $this->backend->status();
+						foreach ( $servers as $server_string => $status ) {
+							echo $server_string ." => ";
+
+							if ( $status == 0 )
+								_e ( '<span class="error-msg">down</span><br />', $this->plugin_constant );
+							elseif ( $status == 1 )
+								_e ( '<span class="ok-msg">up & running</span><br />', $this->plugin_constant );
+							else
+								_e ( '<span class="error-msg">unknown, please try re-saving settings!</span><br />', $this->plugin_constant );
+						}
+
+						?></p><?php
+					endif;
+				?>
+			</div>
+			<form method="post" action="#" id="<?php echo $this->plugin_constant ?>-settings" class="plugin-admin">
+
+				<ul class="tabs">
+					<li><a href="#<?php echo $this->plugin_constant ?>-type" class="wp-switch-editor"><?php _e( 'Cache type', $this->plugin_constant ); ?></a></li>
+					<li><a href="#<?php echo $this->plugin_constant ?>-debug" class="wp-switch-editor"><?php _e( 'Debug & in-depth', $this->plugin_constant ); ?></a></li>
+					<li><a href="#<?php echo $this->plugin_constant ?>-exceptions" class="wp-switch-editor"><?php _e( 'Cache exceptions', $this->plugin_constant ); ?></a></li>
+					<li><a href="#<?php echo $this->plugin_constant ?>-memcached" class="wp-switch-editor"><?php _e( 'Memcache(d)', $this->plugin_constant ); ?></a></li>
+					<li><a href="#<?php echo $this->plugin_constant ?>-nginx" class="wp-switch-editor"><?php _e( 'nginx', $this->plugin_constant ); ?></a></li>
+				</ul>
+
+				<fieldset id="<?php echo $this->plugin_constant ?>-type">
+				<legend><?php _e( 'Set cache type', $this->plugin_constant ); ?></legend>
+				<dl>
+					<dt>
+						<label for="cache_type"><?php _e('Select backend', $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<select name="cache_type" id="cache_type">
+							<?php $this->print_select_options ( $this->select_cache_type , $this->options['cache_type'], $this->valid_cache_type ) ?>
+						</select>
+						<span class="description"><?php _e('Select backend storage driver', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'cache_type' ); ?></span>
+					</dd>
+
+					<dt>
+						<label for="expire"><?php _e('Expiration time (ms)', $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="number" name="expire" id="expire" value="<?php echo $this->options['expire']; ?>" />
+						<span class="description"><?php _e('Sets validity time of entry in milliseconds', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'expire' ); ?></span>
+					</dd>
+
+					<dt>
+						<label for="charset"><?php _e('Charset', $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="text" name="charset" id="charset" value="<?php echo $this->options['charset']; ?>" />
+						<span class="description"><?php _e('Charset of HTML and XML (pages and feeds) data.', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'charset' ); ?></span>
+					</dd>
+
+					<dt>
+						<label for="invalidation_method"><?php _e('Cache invalidation method', $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<select name="invalidation_method" id="invalidation_method">
+							<?php $this->print_select_options ( $this->select_invalidation_method , $this->options['invalidation_method'] ) ?>
+						</select>
+						<span class="description"><?php _e('Select cache invalidation method. <p><strong>Be careful! Selecting "flush cache" will flush the whole cache, including elements that might have been set and used by other applications. Also, invalidating only the post will _not_ clear categories, archive and taxonomy pages, therefore only use this if refreshing after publish can wait until the entries expire on their own.</strong></p>', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'invalidation_method' ); ?></span>
+					</dd>
+
+					<dt>
+						<label for="prefix_data"><?php _e('Data prefix', $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="text" name="prefix_data" id="prefix_data" value="<?php echo $this->options['prefix_data']; ?>" />
+						<span class="description"><?php _e('Prefix for HTML content keys, can be used in nginx.', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'prefix_data' ); ?></span>
+					</dd>
+
+					<dt>
+						<label for="prefix_meta"><?php _e('Meta prefix', $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="text" name="prefix_meta" id="prefix_meta" value="<?php echo $this->options['prefix_meta']; ?>" />
+						<span class="description"><?php _e('Prefix for meta content keys, used only with PHP processing.', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'prefix_meta' ); ?></span>
+					</dd>
+				</dl>
+				</fieldset>
+
+				<fieldset id="<?php echo $this->plugin_constant ?>-debug">
+				<legend><?php _e( 'Debug & in-depth settings', $this->plugin_constant ); ?></legend>
+				<dl>
+					<dt>
+						<label for="log"><?php _e("Enable logging", $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="checkbox" name="log" id="log" value="1" <?php checked($this->options['log'],true); ?> />
+						<span class="description"><?php _e('Enables ERROR and WARNING level syslog messages. Requires PHP syslog function.', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'log' ); ?></span>
+					</dd>
+
+					<dt>
+						<label for="log_info"><?php _e("Enable information log", $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="checkbox" name="log_info" id="log_info" value="1" <?php checked($this->options['log_info'],true); ?> />
+						<span class="description"><?php _e('Enables INFO level messages; carefull, plugin is really talkative. Requires PHP syslog function.', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'log_info' ); ?></span>
+					</dd>
+
+					<dt>
+						<label for="response_header"><?php _e("Add X-Cache-Engine header", $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="checkbox" name="response_header" id="response_header" value="1" <?php checked($this->options['response_header'],true); ?> />
+						<span class="description"><?php _e('Add X-Cache-Engine HTTP header to HTTP responses.', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'response_header' ); ?></span>
+					</dd>
+
+					<dt>
+						<label for="sync_protocols"><?php _e("Enable sync protocolls", $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="checkbox" name="sync_protocols" id="sync_protocols" value="1" <?php checked($this->options['sync_protocols'],true); ?> />
+						<span class="description"><?php _e('Enable to replace every protocol to the same as in the request for site\'s domain', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'sync_protocols' ); ?></span>
+					</dd>
+
+				</dl>
+				</fieldset>
+
+				<fieldset id="<?php echo $this->plugin_constant ?>-exceptions">
+				<legend><?php _e( 'Set cache additions/excepions', $this->plugin_constant ); ?></legend>
+				<dl>
+					<dt>
+						<label for="cache_loggedin"><?php _e('Enable cache for logged in users', $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="checkbox" name="cache_loggedin" id="cache_loggedin" value="1" <?php checked($this->options['cache_loggedin'],true); ?> />
+						<span class="description"><?php _e('Cache pages even if user is logged in.', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'cache_loggedin' ); ?></span>
+					</dd>
+
+					<dt>
+						<label for="nocache_home"><?php _e("Don't cache home", $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="checkbox" name="nocache_home" id="nocache_home" value="1" <?php checked($this->options['nocache_home'],true); ?> />
+						<span class="description"><?php _e('Exclude home page from caching', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'nocache_home' ); ?></span>
+					</dd>
+
+					<dt>
+						<label for="nocache_feed"><?php _e("Don't cache feeds", $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="checkbox" name="nocache_feed" id="nocache_feed" value="1" <?php checked($this->options['nocache_feed'],true); ?> />
+						<span class="description"><?php _e('Exclude feeds from caching.', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'nocache_feed' ); ?></span>
+					</dd>
+
+					<dt>
+						<label for="nocache_archive"><?php _e("Don't cache archives", $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="checkbox" name="nocache_archive" id="nocache_archive" value="1" <?php checked($this->options['nocache_archive'],true); ?> />
+						<span class="description"><?php _e('Exclude archives from caching.', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'nocache_archive' ); ?></span>
+					</dd>
+
+					<dt>
+						<label for="nocache_single"><?php _e("Don't cache posts (and single-type entries)", $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="checkbox" name="nocache_single" id="nocache_single" value="1" <?php checked($this->options['nocache_single'],true); ?> />
+						<span class="description"><?php _e('Exclude singles from caching.', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'nocache_single' ); ?></span>
+					</dd>
+
+					<dt>
+						<label for="nocache_page"><?php _e("Don't cache pages", $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="checkbox" name="nocache_page" id="nocache_page" value="1" <?php checked($this->options['nocache_page'],true); ?> />
+						<span class="description"><?php _e('Exclude pages from caching.', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'nocache_page' ); ?></span>
+					</dd>
+				</dl>
+				</fieldset>
+
+				<fieldset id="<?php echo $this->plugin_constant ?>-memcached">
+				<legend><?php _e('Settings for memcached backend', $this->plugin_constant); ?></legend>
+				<dl>
+					<dt>
+						<label for="hosts"><?php _e('Hosts', $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="text" name="hosts" id="hosts" value="<?php echo $this->options['hosts']; ?>" />
+						<span class="description"><?php _e('List all valid like host:port,host:port,... <br />No spaces are allowed, please stick to use ":" for separating host and port and "," for separating entries. Do not add trailing ",".', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'hosts' ); ?></span>
+					</dd>
+					<dt>
+						<label for="persistent"><?php _e('Persistent memcache connections', $this->plugin_constant); ?></label>
+					</dt>
+					<dd>
+						<input type="checkbox" name="persistent" id="persistent" value="1" <?php checked($this->options['persistent'],true); ?> />
+						<span class="description"><?php _e('Make all memcache(d) connections persistent. Be carefull with this setting, always test the outcome.', $this->plugin_constant); ?></span>
+						<span class="default"><?php $this->print_default ( 'persistent' ); ?></span>
+					</dd>
+				</dl>
+				</fieldset>
+
+				<fieldset id="<?php echo $this->plugin_constant ?>-nginx">
+				<legend><?php _e('Sample config for nginx to utilize the data entries', $this->plugin_constant); ?></legend>
+				<pre><?php echo $this->nginx_example(); ?></pre>
+				</fieldset>
+
+				<p class="clear">
+					<input class="button-primary" type="submit" name="<?php echo $this->button_save ?>" id="<?php echo $this->button_save ?>" value="<?php _e('Save Changes', $this->plugin_constant ) ?>" />
+					<input class="button-secondary" style="float: right" type="submit" name="<?php echo $this->button_delete ?>" id="<?php echo $this->button_delete ?>" value="<?php _e('Delete options from DB', $this->plugin_constant ) ?>" />
+					<input class="button-secondary" style="float: right" type="submit" name="<?php echo $this->button_flush ?>" id="<?php echo $this->button_flush ?>" value="<?php _e('Clear cache', $this->plugin_constant ) ?>" />
+				</p>
+
+			</form>
+			</div>
+			<?php
+		}
+
+		/**
+		 * extending admin init
+		 *
+		 */
+		public function plugin_hook_admin_init () {
+			/* save parameter updates, if there are any */
+			if ( isset( $_POST[ $this->button_flush ] ) ) {
+				$this->backend->clear();
+				$this->status = 3;
+				header( "Location: ". $this->settings_link . self::slug_flush );
+			}
+		}
+
+		/**
+		 * extending options_save
+		 *
+		 */
+		public function plugin_hook_options_save( $activating ) {
+
+			/* flush the cache when news options are saved, not needed on activation */
+			if ( !$activating )
+				$this->backend->clear();
+
+			/* create the to-be-included configuration for advanced-cache.php */
+			$this->update_global_config();
+
+			/* create advanced cache file, needed only once or on activation, because there could be lefover advanced-cache.php from different plugins */
+			if (  !$activating )
+				$this->deploy_acache();
+
+		}
+
+		/**
+		 * read hook; needs to be implemented
+		 */
+		public function plugin_hook_options_read( &$options ) {
+			/* read the global options, network compatibility */
+			$this->global_config = get_site_option( $this->global_option );
+
+			/* check if current site present in global config */
+			if ( !empty ( $this->global_config[ $this->global_config_key ] ) )
+				$this->global_saved = true;
+
+			$this->global_config[ $this->global_config_key ] = $options;
+		}
+
+		/**
+		 * options delete hook; needs to be implemented
+		 */
+		public function plugin_hook_options_delete(  ) {
+			delete_site_option ( $this->global_option );
+		}
+
+		/**
+		 * need to do migrations from previous versions of the plugin
+		 *
+		 */
+		public function plugin_hook_options_migrate( &$options ) {
+
+			if ( $options['version'] != $this->plugin_version || !isset ( $options['version'] ) ) {
+
+				/* cleanup possible leftover files from previous versions */
+				$check = array ( 'advanced-cache.php', 'nginx-sample.conf', 'wp-ffpc.admin.css', 'wp-ffpc-common.php' );
+				foreach ( $check as $fname ) {
+					$fname = $this->plugin_dir . $fname;
+					if ( file_exists ( $fname ) )
+						unlink ( $fname );
+				}
+
+				/* updating from version 0.4.x */
+				if ( !empty ( $options['host'] ) ) {
+					$options['hosts'] = $options['host'] . ':' . $options['port'];
+				}
+				/* migrating from version 0.6.x */
+				elseif ( is_array ( $options ) && array_key_exists ( $this->global_config_key , $options ) ) {
+					$options = $options[ $this->global_config_key ];
+				}
+				/* migrating from something, drop previous config */
+				else {
+					$options = array();
+				}
+				/* renamed options */
+				$options['log'] = $options['syslog'];
+				$options['response_header'] = $options['debug'];
+			}
+		}
+
+		/**
+		 * advanced-cache.php creator function
+		 *
+		 */
+		private function deploy_acache( ) {
+
+			/* in case advanced-cache.php was already there, remove it */
+			if ( @file_exists( $this->acache ))
+				unlink ($this->acache);
+
+			/* is deletion was unsuccessful, die, we have no rights to do that, fail */
+			if ( @file_exists( $this->acache ))
+				return false;
+
+			/* if no active site left no need for advanced cache :( */
+			if ( empty ( $this->global_config ) )
+				return false;
+
+			/* add the required includes and generate the needed code */
+			$string[] = "<?php";
+			$string[] = self::global_config_var . ' = ' . var_export ( $this->global_config, true ) . ';' ;
+			$string[] = "include_once ('" . $this->acache_backend . "');";
+			$string[] = "include_once ('" . $this->acache_worker . "');";
+			$string[] = "?>";
+
+			/* write the file and start caching from this point */
+			return file_put_contents( $this->acache, join( "\n" , $string ) );
+		}
+
+		/**
+		 * function to generate working example from the nginx sample file
+		 *
+		 * @return string nginx config file
+		 *
+		 */
+		private function nginx_example () {
+			/* read the sample file */
+			$nginx = file_get_contents ( $this->nginx_sample );
+
+			/* this part is not used when the cache is turned on for logged in users */
+			$loggedin = '# avoid cache for logged in users
+				if ($http_cookie ~* "comment_author_|wordpressuser_|wp-postpass_" ) {
+					set $memcached_request 0;
+				}';
+
+			/* replace the data prefix with the configured one */
+			$nginx = str_replace ( 'DATAPREFIX' , $this->options['prefix_data'] , $nginx );
+
+			/* set upstream servers from configured servers, best to get from the actual backend */
+			$servers = $this->backend->get_servers();
+			foreach ( array_keys( $servers ) as $server ) {
+				$nginx_servers .= "		server ". $server .";\n";
+			}
+			$nginx = str_replace ( 'MEMCACHED_SERVERS' , $nginx_servers , $nginx );
+
+			/* add logged in cache, if valid */
+			if ( ! $this->options['cache_loggedin'])
+				$nginx = str_replace ( 'LOGGEDIN_EXCEPTION' , $loggedin , $nginx );
+			else
+				$nginx = str_replace ( 'LOGGEDIN_EXCEPTION' , '' , $nginx );
+
+			return $nginx;
+		}
+
+		/**
+		 * function to update global configuration
+		 *
+		 * @param boolean $remove_site Bool to remove or add current config to global
+		 *
+		 */
+		private function update_global_config ( $remove_site = false ) {
+
+			/* remove or add current config to global config */
+			if ( $remove_site ) {
+				unset ( $this->global_config[ $this->global_config_key ] );
+			}
+			else {
+				$this->global_config[ $this->global_config_key ] = $this->options;
+			}
+
+			/* deploy advanced-cache.php */
+			$this->deploy_acache ();
+
+			/* save options to database */
+			update_site_option( $this->global_option , $this->global_config );
+		}
+
+	}
+}
+
+?>
diff --git a/wp-ffpc-nginx-sample.conf b/wp-ffpc-nginx-sample.conf
new file mode 100644
index 0000000..b9f7e87
--- /dev/null
+++ b/wp-ffpc-nginx-sample.conf
@@ -0,0 +1,51 @@
+http {
+	...
+	upstream memcached-servers {
+MEMCACHED_SERVERS
+	}
+	...
+	server {
+		...
+
+		# try to get result from memcached
+		location @memcached {
+				default_type text/html;
+				set $memcached_key DATAPREFIX$scheme://$host$request_uri;
+				set $memcached_request 1;
+
+				# exceptions
+				# avoid cache serve of POST requests
+				if ($request_method = POST ) {
+						set $memcached_request 0;
+				}
+
+				# avoid cache serve of wp-admin-like pages, starting with "wp-"
+				if ( $uri ~ "/wp-" ) {
+						set $memcached_request 0;
+				}
+
+				LOGGEDIN_EXCEPTION
+
+				if ( $memcached_request = 1) {
+						memcached_pass memcached-servers;
+						error_page 404 = @rewrites;
+				}
+
+				if ( $memcached_request = 0) {
+						rewrite ^ /index.php$request_uri last;
+				}
+		}
+
+		## rewrite rules
+		location @rewrites {
+				rewrite ^ /index.php$request_uri last;
+		}
+
+		location / {
+				try_files $uri $uri/ @memcached;
+		}
+
+		...
+	}
+}
+...