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/**
* Imagify beat API
*
* This is a modified version of WordPress’ Heartbeat (WP 5.2.1).
* The main difference is that it allows to prevent suspension entirely.
* It uses the var imagifybeatSettings on init.
*
* Custom jQuery events:
* - imagifybeat-send
* - imagifybeat-tick
* - imagifybeat-error
* - imagifybeat-connection-lost
* - imagifybeat-connection-restored
* - imagifybeat-nonces-expired
*
* @since 1.9.3
*/
window.imagify = window.imagify || {};
/* eslint-disable no-use-before-define */
(function($, d, w, undefined) { // eslint-disable-line no-unused-vars, no-shadow, no-shadow-restricted-names
/**
* Constructs the Imagifybeat API.
*
* @since 1.9.3
* @constructor
*
* @return {Imagifybeat} An instance of the Imagifybeat class.
*/
var Imagifybeat = function() {
var $document = $( d ),
settings = {
// Suspend/resume.
suspend: false,
// Whether suspending is enabled.
suspendEnabled: true,
// Current screen id, defaults to the JS global 'pagenow' when present
// (in the admin) or 'front'.
screenId: '',
// XHR request URL, defaults to the JS global 'ajaxurl' when present.
url: '',
// Timestamp, start of the last connection request.
lastTick: 0,
// Container for the enqueued items.
queue: {},
// Connect interval (in seconds).
mainInterval: 60,
// Used when the interval is set to 5 sec. temporarily.
tempInterval: 0,
// Used when the interval is reset.
originalInterval: 0,
// Used to limit the number of AJAX requests.
minimalInterval: 0,
// Used together with tempInterval.
countdown: 0,
// Whether a connection is currently in progress.
connecting: false,
// Whether a connection error occurred.
connectionError: false,
// Used to track non-critical errors.
errorcount: 0,
// Whether at least one connection has been completed successfully.
hasConnected: false,
// Whether the current browser w is in focus and the user is active.
hasFocus: true,
// Timestamp, last time the user was active. Checked every 30 sec.
userActivity: 0,
// Flag whether events tracking user activity were set.
userActivityEvents: false,
// Timer that keeps track of how long a user has focus.
checkFocusTimer: 0,
// Timer that keeps track of how long needs to be waited before connecting to
// the server again.
beatTimer: 0
};
/**
* Sets local variables and events, then starts the beat.
*
* @since 1.9.3
* @access private
*
* @return {void}
*/
function initialize() {
var options, hidden, visibilityState, visibilitychange;
if ( typeof w.pagenow === 'string' ) {
settings.screenId = w.pagenow;
}
if ( typeof w.ajaxurl === 'string' ) {
settings.url = w.ajaxurl;
}
// Pull in options passed from PHP.
if ( typeof w.imagifybeatSettings === 'object' ) {
options = w.imagifybeatSettings;
// The XHR URL can be passed as option when w.ajaxurl is not set.
if ( ! settings.url && options.ajaxurl ) {
settings.url = options.ajaxurl;
}
/*
* The interval can be from 15 to 120 sec. and can be set temporarily to 5 sec.
* It can be set in the initial options or changed later through JS and/or
* through PHP.
*/
if ( options.interval ) {
settings.mainInterval = options.interval;
if ( settings.mainInterval < 15 ) {
settings.mainInterval = 15;
} else if ( settings.mainInterval > 120 ) {
settings.mainInterval = 120;
}
}
/*
* Used to limit the number of AJAX requests. Overrides all other intervals if
* they are shorter. Needed for some hosts that cannot handle frequent requests
* and the user may exceed the allocated server CPU time, etc. The minimal
* interval can be up to 600 sec. however setting it to longer than 120 sec.
* will limit or disable some of the functionality (like post locks). Once set
* at initialization, minimalInterval cannot be changed/overridden.
*/
if ( options.minimalInterval ) {
options.minimalInterval = parseInt( options.minimalInterval, 10 );
settings.minimalInterval = options.minimalInterval > 0 && options.minimalInterval <= 600 ? options.minimalInterval * 1000 : 0;
}
if ( settings.minimalInterval && settings.mainInterval < settings.minimalInterval ) {
settings.mainInterval = settings.minimalInterval;
}
// 'screenId' can be added from settings on the front end where the JS global
// 'pagenow' is not set.
if ( ! settings.screenId ) {
settings.screenId = options.screenId || 'front';
}
if ( 'disable' === options.suspension ) {
disableSuspend();
}
}
// Convert to milliseconds.
settings.mainInterval = settings.mainInterval * 1000;
settings.originalInterval = settings.mainInterval;
/*
* Switch the interval to 120 seconds by using the Page Visibility API.
* If the browser doesn't support it (Safari < 7, Android < 4.4, IE < 10), the
* interval will be increased to 120 seconds after 5 minutes of mouse and keyboard
* inactivity.
*/
if ( typeof document.hidden !== 'undefined' ) {
hidden = 'hidden';
visibilitychange = 'visibilitychange';
visibilityState = 'visibilityState';
} else if ( typeof document.msHidden !== 'undefined' ) { // IE10
hidden = 'msHidden';
visibilitychange = 'msvisibilitychange';
visibilityState = 'msVisibilityState';
} else if ( typeof document.webkitHidden !== 'undefined' ) { // Android
hidden = 'webkitHidden';
visibilitychange = 'webkitvisibilitychange';
visibilityState = 'webkitVisibilityState';
}
if ( hidden ) {
if ( document[ hidden ] ) {
settings.hasFocus = false;
}
$document.on( visibilitychange + '.imagifybeat', function() {
if ( 'hidden' === document[ visibilityState ] ) {
blurred();
w.clearInterval( settings.checkFocusTimer );
} else {
focused();
if ( document.hasFocus ) {
settings.checkFocusTimer = w.setInterval( checkFocus, 10000 );
}
}
});
}
// Use document.hasFocus() if available.
if ( document.hasFocus ) {
settings.checkFocusTimer = w.setInterval( checkFocus, 10000 );
}
$( w ).on( 'unload.imagifybeat', function() {
// Don't connect anymore.
settings.suspend = true;
// Abort the last request if not completed.
if ( settings.xhr && 4 !== settings.xhr.readyState ) {
settings.xhr.abort();
}
} );
// Check for user activity every 30 seconds.
w.setInterval( checkUserActivity, 30000 );
// Start one tick after DOM ready.
$document.ready( function() {
settings.lastTick = time();
scheduleNextTick();
} );
}
/**
* Returns the current time according to the browser.
*
* @since 1.9.3
* @access private
*
* @return {int} Returns the current time.
*/
function time() {
return (new Date()).getTime();
}
/**
* Checks if the iframe is from the same origin.
*
* @since 1.9.3
* @access private
*
* @return {bool} Returns whether or not the iframe is from the same origin.
*/
function isLocalFrame( frame ) {
var origin, src = frame.src;
/*
* Need to compare strings as WebKit doesn't throw JS errors when iframes have different origin. It throws uncatchable exceptions.
*/
if ( src && /^https?:\/\//.test( src ) ) {
origin = w.location.origin ? w.location.origin : w.location.protocol + '//' + w.location.host;
if ( src.indexOf( origin ) !== 0 ) {
return false;
}
}
try {
if ( frame.contentWindow.document ) {
return true;
}
} catch ( e ) {} // eslint-disable-line no-empty
return false;
}
/**
* Checks if the document's focus has changed.
*
* @since 1.9.3
* @access private
*
* @return {void}
*/
function checkFocus() {
if ( settings.hasFocus && ! document.hasFocus() ) {
blurred();
} else if ( ! settings.hasFocus && document.hasFocus() ) {
focused();
}
}
/**
* Sets error state and fires an event on XHR errors or timeout.
*
* @since 1.9.3
* @access private
*
* @param {string} error The error type passed from the XHR.
* @param {int} httpStatus The HTTP status code passed from jqXHR (200, 404, 500, etc.).
* @return {void}
*/
function setErrorState( error, httpStatus ) {
var trigger;
if ( error ) {
switch ( error ) {
case 'abort':
// Do nothing.
break;
case 'timeout':
// No response for 30 sec.
trigger = true;
break;
case 'error':
if ( 503 === httpStatus && settings.hasConnected ) {
trigger = true;
break;
}
/* falls through */
case 'parsererror':
case 'empty':
case 'unknown':
settings.errorcount++;
if ( settings.errorcount > 2 && settings.hasConnected ) {
trigger = true;
}
break;
}
if ( trigger && ! hasConnectionError() ) {
settings.connectionError = true;
$document.trigger( 'imagifybeat-connection-lost', [ error, httpStatus ] );
if ( w.wp.hooks ) {
w.wp.hooks.doAction( 'imagifybeat.connection-lost', error, httpStatus );
}
}
}
}
/**
* Clears the error state and fires an event if there is a connection error.
*
* @since 1.9.3
* @access private
*
* @return {void}
*/
function clearErrorState() {
// Has connected successfully.
settings.hasConnected = true;
if ( hasConnectionError() ) {
settings.errorcount = 0;
settings.connectionError = false;
$document.trigger( 'imagifybeat-connection-restored' );
if ( w.wp.hooks ) {
w.wp.hooks.doAction( 'imagifybeat.connection-restored' );
}
}
}
/**
* Gathers the data and connects to the server.
*
* @since 1.9.3
* @access private
*
* @return {void}
*/
function connect() {
var ajaxData, imagifybeatData;
// If the connection to the server is slower than the interval,
// imagifybeat connects as soon as the previous connection's response is received.
if ( settings.connecting || settings.suspend ) {
return;
}
settings.lastTick = time();
imagifybeatData = $.extend( {}, settings.queue );
// Clear the data queue. Anything added after this point will be sent on the next tick.
settings.queue = {};
$document.trigger( 'imagifybeat-send', [ imagifybeatData ] );
if ( w.wp.hooks ) {
w.wp.hooks.doAction( 'imagifybeat.send', imagifybeatData );
}
ajaxData = {
data: imagifybeatData,
interval: settings.tempInterval ? settings.tempInterval / 1000 : settings.mainInterval / 1000,
_nonce: typeof w.imagifybeatSettings === 'object' ? w.imagifybeatSettings.nonce : '',
action: 'imagifybeat',
screen_id: settings.screenId,
has_focus: settings.hasFocus
};
if ( 'customize' === settings.screenId ) {
ajaxData.wp_customize = 'on';
}
settings.connecting = true;
settings.xhr = $.ajax( {
url: settings.url,
type: 'post',
timeout: 60000, // Throw an error if not completed after 60 sec.
data: ajaxData,
dataType: 'json'
} ).always( function() {
settings.connecting = false;
scheduleNextTick();
} ).done( function( response, textStatus, jqXHR ) {
var newInterval;
if ( ! response ) {
setErrorState( 'empty' );
return;
}
clearErrorState();
if ( response.nonces_expired ) {
$document.trigger( 'imagifybeat-nonces-expired' );
if ( w.wp.hooks ) {
w.wp.hooks.doAction( 'imagifybeat.nonces-expired' );
}
}
// Change the interval from PHP
if ( response.imagifybeat_interval ) {
newInterval = response.imagifybeat_interval;
delete response.imagifybeat_interval;
}
// Update the imagifybeat nonce if set.
if ( response.imagifybeat_nonce && typeof w.imagifybeatSettings === 'object' ) {
w.imagifybeatSettings.nonce = response.imagifybeat_nonce;
delete response.imagifybeat_nonce;
}
$document.trigger( 'imagifybeat-tick', [ response, textStatus, jqXHR ] );
if ( w.wp.hooks ) {
w.wp.hooks.doAction( 'imagifybeat.tick', response, textStatus, jqXHR );
}
// Do this last. Can trigger the next XHR if connection time > 5 sec. and newInterval == 'fast'.
if ( newInterval ) {
interval( newInterval );
}
} ).fail( function( jqXHR, textStatus, error ) {
setErrorState( textStatus || 'unknown', jqXHR.status );
$document.trigger( 'imagifybeat-error', [ jqXHR, textStatus, error ] );
if ( w.wp.hooks ) {
w.wp.hooks.doAction( 'imagifybeat.error', jqXHR, textStatus, error );
}
} );
}
/**
* Schedules the next connection.
*
* Fires immediately if the connection time is longer than the interval.
*
* @since 1.9.3
* @access private
*
* @return {void}
*/
function scheduleNextTick() {
var delta = time() - settings.lastTick,
interv = settings.mainInterval;
if ( settings.suspend ) {
return;
}
if ( ! settings.hasFocus && settings.suspendEnabled ) {
// When no user activity or the window lost focus, increase polling interval to 120 seconds, but only if suspend is enabled.
interv = 120000; // 120 sec.
} else if ( settings.countdown > 0 && settings.tempInterval ) {
interv = settings.tempInterval;
settings.countdown--;
if ( settings.countdown < 1 ) {
settings.tempInterval = 0;
}
}
if ( settings.minimalInterval && interv < settings.minimalInterval ) {
interv = settings.minimalInterval;
}
w.clearTimeout( settings.beatTimer );
if ( delta < interv ) {
settings.beatTimer = w.setTimeout(
function() {
connect();
},
interv - delta
);
} else {
connect();
}
}
/**
* Sets the internal state when the browser w becomes hidden or loses focus.
*
* @since 1.9.3
* @access private
*
* @return {void}
*/
function blurred() {
settings.hasFocus = false;
}
/**
* Sets the internal state when the browser w becomes visible or is in focus.
*
* @since 1.9.3
* @access private
*
* @return {void}
*/
function focused() {
settings.userActivity = time();
// Resume if suspended
settings.suspend = false;
if ( ! settings.hasFocus ) {
settings.hasFocus = true;
scheduleNextTick();
}
}
/**
* Runs when the user becomes active after a period of inactivity.
*
* @since 1.9.3
* @access private
*
* @return {void}
*/
function userIsActive() {
settings.userActivityEvents = false;
$document.off( '.imagifybeat-active' );
$( 'iframe' ).each( function( i, frame ) {
if ( isLocalFrame( frame ) ) {
$( frame.contentWindow ).off( '.imagifybeat-active' );
}
} );
focused();
}
/**
* Checks for user activity.
*
* Runs every 30 sec. Sets 'hasFocus = true' if user is active and the w is
* in the background. Sets 'hasFocus = false' if the user has been inactive
* (no mouse or keyboard activity) for 5 min. even when the w has focus.
*
* @since 1.9.3
* @access private
*
* @return {void}
*/
function checkUserActivity() {
var lastActive = settings.userActivity ? time() - settings.userActivity : 0;
// Set hasFocus to false when no mouse or keyboard activity for 5 min.
if ( lastActive > 300000 && settings.hasFocus ) {
blurred();
}
// Suspend after 10 min. of inactivity.
if ( settings.suspendEnabled && lastActive > 600000 ) {
settings.suspend = true;
}
if ( ! settings.userActivityEvents ) {
$document.on( 'mouseover.imagifybeat-active keyup.imagifybeat-active touchend.imagifybeat-active', function() {
userIsActive();
} );
$( 'iframe' ).each( function( i, frame ) {
if ( isLocalFrame( frame ) ) {
$( frame.contentWindow ).on( 'mouseover.imagifybeat-active keyup.imagifybeat-active touchend.imagifybeat-active', function() {
userIsActive();
} );
}
} );
settings.userActivityEvents = true;
}
}
// Public methods.
/**
* Checks whether the w (or any local iframe in it) has focus, or the user
* is active.
*
* @since 1.9.3
* @memberOf imagify.beat.prototype
*
* @return {bool} True if the w or the user is active.
*/
function hasFocus() {
return settings.hasFocus;
}
/**
* Checks whether there is a connection error.
*
* @since 1.9.3
* @memberOf imagify.beat.prototype
*
* @return {bool} True if a connection error was found.
*/
function hasConnectionError() {
return settings.connectionError;
}
/**
* Connects as soon as possible regardless of 'hasFocus' state.
*
* Will not open two concurrent connections. If a connection is in progress,
* will connect again immediately after the current connection completes.
*
* @since 1.9.3
* @memberOf imagify.beat.prototype
*
* @return {void}
*/
function connectNow() {
settings.lastTick = 0;
scheduleNextTick();
}
/**
* Disables suspending.
*
* Should be used only when Imagifybeat is performing critical tasks like
* autosave, post-locking, etc. Using this on many screens may overload the
* user's hosting account if several browser ws/tabs are left open for a
* long time.
*
* @since 1.9.3
* @memberOf imagify.beat.prototype
*
* @return {void}
*/
function disableSuspend() {
settings.suspendEnabled = false;
}
/**
* Enables suspending.
*
* @since 1.9.3
* @memberOf imagify.beat.prototype
*
* @return {void}
*/
function enableSuspend() {
settings.suspendEnabled = true;
}
/**
* Gets/Sets the interval.
*
* When setting to 'fast' or 5, the interval is 5 seconds for the next 30 ticks
* (for 2 minutes and 30 seconds) by default. In this case the number of 'ticks'
* can be passed as second argument. If the window doesn't have focus, the
* interval slows down to 2 min.
*
* @since 1.9.3
* @memberOf imagify.beat.prototype
*
* @param {string|int} speed Interval: 'fast' or 5, 15, 30, 60, 120. Fast equals 5.
* @param {string} ticks Tells how many ticks before the interval reverts back. Used with speed = 'fast' or 5.
* @return {int} Current interval in seconds.
*/
function interval( speed, ticks ) {
var newInterval,
oldInterval = settings.tempInterval ? settings.tempInterval : settings.mainInterval;
if ( speed ) {
switch ( speed ) {
case 'fast':
case 5:
newInterval = 5000;
break;
case 15:
newInterval = 15000;
break;
case 30:
newInterval = 30000;
break;
case 60:
newInterval = 60000;
break;
case 120:
newInterval = 120000;
break;
case 'long-polling':
// Allow long polling, (experimental)
settings.mainInterval = 0;
return 0;
default:
newInterval = settings.originalInterval;
}
if ( settings.minimalInterval && newInterval < settings.minimalInterval ) {
newInterval = settings.minimalInterval;
}
if ( 5000 === newInterval ) {
ticks = parseInt( ticks, 10 ) || 30;
ticks = ticks < 1 || ticks > 30 ? 30 : ticks;
settings.countdown = ticks;
settings.tempInterval = newInterval;
} else {
settings.countdown = 0;
settings.tempInterval = 0;
settings.mainInterval = newInterval;
}
// Change the next connection time if new interval has been set.
// Will connect immediately if the time since the last connection
// is greater than the new interval.
if ( newInterval !== oldInterval ) {
scheduleNextTick();
}
}
return settings.tempInterval ? settings.tempInterval / 1000 : settings.mainInterval / 1000;
}
/**
* Resets the interval.
*
* @since 1.9.3
* @memberOf imagify.beat.prototype
*
* @return {int} Current interval in seconds.
*/
function resetInterval() {
return interval( settings.originalInterval );
}
/**
* Enqueues data to send with the next XHR.
*
* As the data is send asynchronously, this function doesn't return the XHR
* response. To see the response, use the custom jQuery event 'imagifybeat-tick'
* on the document, example:
* $(document).on( 'imagifybeat-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 `imagify.beat.isQueued('handle')` to see if
* any data is already queued for that handle.
*
* @since 1.9.3
* @memberOf imagify.beat.prototype
*
* @param {string} handle Unique handle for the data, used in PHP to receive the data.
* @param {mixed} data The data to send.
* @param {bool} noOverwrite Whether to overwrite existing data in the queue.
* @return {bool} True if the data was queued.
*/
function enqueue( handle, data, noOverwrite ) {
if ( handle ) {
if ( noOverwrite && this.isQueued( handle ) ) {
return false;
}
settings.queue[handle] = data;
return true;
}
return false;
}
/**
* Checks if data with a particular handle is queued.
*
* @since 1.9.3
*
* @param {string} handle The handle for the data.
* @return {bool} True if the data is queued with this handle.
*/
function isQueued( handle ) {
if ( handle ) {
return settings.queue.hasOwnProperty( handle );
}
}
/**
* Removes data with a particular handle from the queue.
*
* @since 1.9.3
* @memberOf imagify.beat.prototype
*
* @param {string} handle The handle for the data.
*/
function dequeue( handle ) {
if ( handle ) {
delete settings.queue[handle];
}
}
/**
* Gets data that was enqueued with a particular handle.
*
* @since 1.9.3
* @memberOf imagify.beat.prototype
*
* @param {string} handle The handle for the data.
* @return {mixed} The data or undefined.
*/
function getQueuedItem( handle ) {
if ( handle ) {
return this.isQueued( handle ) ? settings.queue[ handle ] : undefined;
}
}
initialize();
// Expose public methods.
return {
hasFocus: hasFocus,
connectNow: connectNow,
disableSuspend: disableSuspend,
enableSuspend: enableSuspend,
interval: interval,
resetInterval: resetInterval,
hasConnectionError: hasConnectionError,
enqueue: enqueue,
dequeue: dequeue,
isQueued: isQueued,
getQueuedItem: getQueuedItem
};
};
/**
* Contains the Imagifybeat API.
*
* @namespace imagify.beat
* @type {Imagifybeat}
*/
w.imagify.beat = new Imagifybeat();
} )( jQuery, document, window );