diff -r 000000000000 -r d970ebf37754 wp/wp-includes/js/heartbeat.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/js/heartbeat.js	Wed Nov 06 03:21:17 2013 +0000
@@ -0,0 +1,490 @@
+/**
+ * Heartbeat API
+ *
+ * Note: this API is "experimental" meaning it will likely change a lot
+ * in the next few releases based on feedback from 3.6.0. If you intend
+ * to use it, please follow the development closely.
+ *
+ * Heartbeat is a simple server polling API that sends XHR requests to
+ * the server every 15 seconds and triggers events (or callbacks) upon
+ * receiving data. Currently these 'ticks' handle transports for post locking,
+ * login-expiration warnings, and related tasks while a user is logged in.
+ *
+ * Available filters in ajax-actions.php:
+ * - heartbeat_received
+ * - heartbeat_send
+ * - heartbeat_tick
+ * - heartbeat_nopriv_received
+ * - heartbeat_nopriv_send
+ * - heartbeat_nopriv_tick
+ * @see wp_ajax_nopriv_heartbeat(), wp_ajax_heartbeat()
+ *
+ * @since 3.6.0
+ */
+
+ // Ensure the global `wp` object exists.
+window.wp = window.wp || {};
+
+(function($){
+	var Heartbeat = function() {
+		var self = this,
+			running,
+			beat,
+			screenId = typeof pagenow != 'undefined' ? pagenow : '',
+			url = typeof ajaxurl != 'undefined' ? ajaxurl : '',
+			settings,
+			tick = 0,
+			queue = {},
+			interval,
+			connecting,
+			countdown = 0,
+			errorcount = 0,
+			tempInterval,
+			hasFocus = true,
+			isUserActive,
+			userActiveEvents,
+			winBlurTimeout,
+			frameBlurTimeout = -1,
+			hasConnectionError = null;
+
+		/**
+		 * Returns a boolean that's indicative of whether or not there is a connection error
+		 *
+		 * @returns boolean
+		 */
+		this.hasConnectionError = function() {
+			return !! hasConnectionError;
+		};
+
+		if ( typeof( window.heartbeatSettings ) == 'object' ) {
+			settings = $.extend( {}, window.heartbeatSettings );
+
+			// Add private vars
+			url = settings.ajaxurl || url;
+			delete settings.ajaxurl;
+			delete settings.nonce;
+
+			interval = settings.interval || 15; // default interval
+			delete settings.interval;
+			// The interval can be from 15 to 60 sec. and can be set temporarily to 5 sec.
+			if ( interval < 15 )
+				interval = 15;
+			else if ( interval > 60 )
+				interval = 60;
+
+			interval = interval * 1000;
+
+			// 'screenId' can be added from settings on the front-end where the JS global 'pagenow' is not set
+			screenId = screenId || settings.screenId || 'front';
+			delete settings.screenId;
+
+			// Add or overwrite public vars
+			$.extend( this, settings );
+		}
+
+		function time(s) {
+			if ( s )
+				return parseInt( (new Date()).getTime() / 1000 );
+
+			return (new Date()).getTime();
+		}
+
+		function isLocalFrame( frame ) {
+			var origin, src = frame.src;
+
+			if ( src && /^https?:\/\//.test( src ) ) {
+				origin = window.location.origin ? window.location.origin : window.location.protocol + '//' + window.location.host;
+
+				if ( src.indexOf( origin ) !== 0 )
+					return false;
+			}
+
+			try {
+				if ( frame.contentWindow.document )
+					return true;
+			} catch(e) {}
+
+			return false;
+		}
+
+		// Set error state and fire an event on XHR errors or timeout
+		function errorstate( error, status ) {
+			var trigger;
+
+			if ( error ) {
+				switch ( error ) {
+					case 'abort':
+						// do nothing
+						break;
+					case 'timeout':
+						// no response for 30 sec.
+						trigger = true;
+						break;
+					case 'parsererror':
+					case 'error':
+					case 'empty':
+					case 'unknown':
+						errorcount++;
+
+						if ( errorcount > 2 )
+							trigger = true;
+
+						break;
+				}
+
+				if ( 503 == status && false === hasConnectionError ) {
+					trigger = true;
+				}
+
+				if ( trigger && ! self.hasConnectionError() ) {
+					hasConnectionError = true;
+					$(document).trigger( 'heartbeat-connection-lost', [error, status] );
+				}
+			} else if ( self.hasConnectionError() ) {
+				errorcount = 0;
+				hasConnectionError = false;
+				$(document).trigger( 'heartbeat-connection-restored' );
+			} else if ( null === hasConnectionError ) {
+				hasConnectionError = false;
+			}
+		}
+
+		function connect() {
+			var send = {}, data, i, empty = true,
+			nonce = typeof window.heartbeatSettings == 'object' ? window.heartbeatSettings.nonce : '';
+			tick = time();
+
+			data = $.extend( {}, queue );
+			// Clear the data queue, anything added after this point will be send on the next tick
+			queue = {};
+
+			$(document).trigger( 'heartbeat-send', [data] );
+
+			for ( i in data ) {
+				if ( data.hasOwnProperty( i ) ) {
+					empty = false;
+					break;
+				}
+			}
+
+			// If nothing to send (nothing is expecting a response),
+			// schedule the next tick and bail
+			if ( empty && ! self.hasConnectionError() ) {
+				connecting = false;
+				next();
+				return;
+			}
+
+			send.data = data;
+			send.interval = interval / 1000;
+			send._nonce = nonce;
+			send.action = 'heartbeat';
+			send.screen_id = screenId;
+			send.has_focus = hasFocus;
+
+			connecting = true;
+			self.xhr = $.ajax({
+				url: url,
+				type: 'post',
+				timeout: 30000, // throw an error if not completed after 30 sec.
+				data: send,
+				dataType: 'json'
+			}).done( function( response, textStatus, jqXHR ) {
+				var new_interval;
+
+				if ( ! response )
+					return errorstate( 'empty' );
+
+				// Clear error state
+				if ( self.hasConnectionError() )
+					errorstate();
+
+				if ( response.nonces_expired ) {
+					$(document).trigger( 'heartbeat-nonces-expired' );
+					return;
+				}
+
+				// Change the interval from PHP
+				if ( response.heartbeat_interval ) {
+					new_interval = response.heartbeat_interval;
+					delete response.heartbeat_interval;
+				}
+
+				self.tick( response, textStatus, jqXHR );
+
+				// do this last, can trigger the next XHR if connection time > 5 sec. and new_interval == 'fast'
+				if ( new_interval )
+					self.interval.call( self, new_interval );
+			}).always( function() {
+				connecting = false;
+				next();
+			}).fail( function( jqXHR, textStatus, error ) {
+				errorstate( textStatus || 'unknown', jqXHR.status );
+				self.error( jqXHR, textStatus, error );
+			});
+		}
+
+		function next() {
+			var delta = time() - tick, t = interval;
+
+			if ( ! running )
+				return;
+
+			if ( ! hasFocus ) {
+				t = 100000; // 100 sec. Post locks expire after 120 sec.
+			} else if ( countdown > 0 && tempInterval ) {
+				t = tempInterval;
+				countdown--;
+			}
+
+			window.clearTimeout(beat);
+
+			if ( delta < t ) {
+				beat = window.setTimeout(
+					function(){
+						if ( running )
+							connect();
+					},
+					t - delta
+				);
+			} else {
+				connect();
+			}
+		}
+
+		function blurred() {
+			window.clearTimeout(winBlurTimeout);
+			window.clearTimeout(frameBlurTimeout);
+			winBlurTimeout = frameBlurTimeout = 0;
+
+			hasFocus = false;
+		}
+
+		function focused() {
+			window.clearTimeout(winBlurTimeout);
+			window.clearTimeout(frameBlurTimeout);
+			winBlurTimeout = frameBlurTimeout = 0;
+
+			isUserActive = time();
+
+			if ( hasFocus )
+				return;
+
+			hasFocus = true;
+			window.clearTimeout(beat);
+
+			if ( ! connecting )
+				next();
+		}
+
+		function setFrameEvents() {
+			$('iframe').each( function( i, frame ){
+				if ( ! isLocalFrame( frame ) )
+					return;
+
+				if ( $.data( frame, 'wp-heartbeat-focus' ) )
+					return;
+
+				$.data( frame, 'wp-heartbeat-focus', 1 );
+
+				$( frame.contentWindow ).on( 'focus.wp-heartbeat-focus', function(e) {
+					focused();
+				}).on('blur.wp-heartbeat-focus', function(e) {
+					setFrameEvents();
+					frameBlurTimeout = window.setTimeout( function(){ blurred(); }, 500 );
+				});
+			});
+		}
+
+		$(window).on( 'blur.wp-heartbeat-focus', function(e) {
+			setFrameEvents();
+			winBlurTimeout = window.setTimeout( function(){ blurred(); }, 500 );
+		}).on( 'focus.wp-heartbeat-focus', function() {
+			$('iframe').each( function( i, frame ) {
+				if ( !isLocalFrame( frame ) )
+					return;
+
+				$.removeData( frame, 'wp-heartbeat-focus' );
+				$( frame.contentWindow ).off( '.wp-heartbeat-focus' );
+			});
+
+			focused();
+		});
+
+		function userIsActive() {
+			userActiveEvents = false;
+			$(document).off( '.wp-heartbeat-active' );
+			$('iframe').each( function( i, frame ) {
+				if ( ! isLocalFrame( frame ) )
+					return;
+
+				$( frame.contentWindow ).off( '.wp-heartbeat-active' );
+			});
+
+			focused();
+		}
+
+		// Set 'hasFocus = true' if user is active and the window is in the background.
+		// Set 'hasFocus = false' if the user has been inactive (no mouse or keyboard activity) for 5 min. even when the window has focus.
+		function checkUserActive() {
+			var lastActive = isUserActive ? time() - isUserActive : 0;
+
+			// Throttle down when no mouse or keyboard activity for 5 min
+			if ( lastActive > 300000 && hasFocus )
+				 blurred();
+
+			if ( ! userActiveEvents ) {
+				$(document).on( 'mouseover.wp-heartbeat-active keyup.wp-heartbeat-active', function(){ userIsActive(); } );
+
+				$('iframe').each( function( i, frame ) {
+					if ( ! isLocalFrame( frame ) )
+						return;
+
+					$( frame.contentWindow ).on( 'mouseover.wp-heartbeat-active keyup.wp-heartbeat-active', function(){ userIsActive(); } );
+				});
+
+				userActiveEvents = true;
+			}
+		}
+
+		// Check for user activity every 30 seconds.
+		window.setInterval( function(){ checkUserActive(); }, 30000 );
+		$(document).ready( function() {
+			// Start one tick (15 sec) after DOM ready
+			running = true;
+			tick = time();
+			next();
+		});
+
+		this.hasFocus = function() {
+			return hasFocus;
+		};
+
+		/**
+		 * Get/Set the interval
+		 *
+		 * When setting to 'fast', the interval is 5 sec. for the next 30 ticks (for 2 min and 30 sec).
+		 * If the window doesn't have focus, the interval slows down to 2 min.
+		 *
+		 * @param string speed Interval speed: 'fast' (5sec), 'standard' (15sec) default, 'slow' (60sec)
+		 * @param string ticks Used with speed = 'fast', how many ticks before the speed reverts back
+		 * @return int Current interval in seconds
+		 */
+		this.interval = function( speed, ticks ) {
+			var reset, seconds;
+			ticks = parseInt( ticks, 10 ) || 30;
+			ticks = ticks < 1 || ticks > 30 ? 30 : ticks;
+
+			if ( speed ) {
+				switch ( speed ) {
+					case 'fast':
+						seconds = 5;
+						countdown = ticks;
+						break;
+					case 'slow':
+						seconds = 60;
+						countdown = 0;
+						break;
+					case 'long-polling':
+						// Allow long polling, (experimental)
+						interval = 0;
+						return 0;
+						break;
+					default:
+						seconds = 15;
+						countdown = 0;
+				}
+
+				// Reset when the new interval value is lower than the current one
+				reset = seconds * 1000 < interval;
+
+				if ( countdown > 0 ) {
+					tempInterval = seconds * 1000;
+				} else {
+					interval = seconds * 1000;
+					tempInterval = 0;
+				}
+
+				if ( reset )
+					next();
+			}
+
+			if ( ! hasFocus )
+				return 120;
+
+			return tempInterval ? tempInterval / 1000 : interval / 1000;
+		};
+
+		/**
+		 * Enqueue data to send with the next XHR
+		 *
+		 * As the data is sent later, this function doesn't return the XHR response.
+		 * To see the response, use the custom jQuery event 'heartbeat-tick' on the document, example:
+		 *		$(document).on( 'heartbeat-tick.myname', function( event, data, textStatus, jqXHR ) {
+		 *			// code
+		 *		});
+		 * If the same 'handle' is used more than once, the data is not overwritten when the third argument is 'true'.
+		 * Use wp.heartbeat.isQueued('handle') to see if any data is already queued for that handle.
+		 *
+		 * $param string handle Unique handle for the data. The handle is used in PHP to receive the data.
+		 * $param mixed data The data to send.
+		 * $param bool dont_overwrite Whether to overwrite existing data in the queue.
+		 * $return bool Whether the data was queued or not.
+		 */
+		this.enqueue = function( handle, data, dont_overwrite ) {
+			if ( handle ) {
+				if ( dont_overwrite && this.isQueued( handle ) )
+					return false;
+
+				queue[handle] = data;
+				return true;
+			}
+			return false;
+		};
+
+		/**
+		 * Check if data with a particular handle is queued
+		 *
+		 * $param string handle The handle for the data
+		 * $return bool Whether some data is queued with this handle
+		 */
+		this.isQueued = function( handle ) {
+			if ( handle )
+				return queue.hasOwnProperty( handle );
+		};
+
+		/**
+		 * Remove data with a particular handle from the queue
+		 *
+		 * $param string handle The handle for the data
+		 * $return void
+		 */
+		this.dequeue = function( handle ) {
+			if ( handle )
+				delete queue[handle];
+		};
+
+		/**
+		 * Get data that was enqueued with a particular handle
+		 *
+		 * $param string handle The handle for the data
+		 * $return mixed The data or undefined
+		 */
+		this.getQueuedItem = function( handle ) {
+			if ( handle )
+				return this.isQueued( handle ) ? queue[handle] : undefined;
+		};
+	};
+
+	$.extend( Heartbeat.prototype, {
+		tick: function( data, textStatus, jqXHR ) {
+			$(document).trigger( 'heartbeat-tick', [data, textStatus, jqXHR] );
+		},
+		error: function( jqXHR, textStatus, error ) {
+			$(document).trigger( 'heartbeat-error', [jqXHR, textStatus, error] );
+		}
+	});
+
+	wp.heartbeat = new Heartbeat();
+
+}(jQuery));