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112 lines
3.4 KiB
112 lines
3.4 KiB
/*
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NTP.js http://jehiah.cz/a/ntp-for-javascript
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copyright Jehiah Czebotar jehiah@gmail.com
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licensed under http://unlicense.org/ please modify as needed
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to use configure serverUrl to an endpoint that when queried
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GET serverUrl + '?t=' + timestamp_in_miliseconds
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returns
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time_offset_in_miliseconds + ':' + argument_t
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*/
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var NTP = {
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cookieShelfLife : 7, //7 days
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requiredResponses : 2,
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serverTimes : new Array,
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serverUrl : "/path/to/getTime",
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resyncTime : 10, // minutes
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sync : function(){
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// if the time was set within the last x minutes; ignore this set request; time was synce recently enough
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var offset = NTP.getCookie("NTPClockOffset");
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if (offset){try{
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var t = offset.split("|")[1];
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var d = NTP.fixTime()-parseInt(t,10);
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if (d < (1000 * 60 * NTP.resyncTime)){return false;} // x minutes; return==skip
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}catch(e){}
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}
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NTP.serverTimes = new Array;
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NTP.getServerTime();
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},
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getNow : function(){
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var date = new Date();
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return date.getTime();
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return (date.getTime() + (date.getTimezoneOffset() * 60000));
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},
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parseServerResponse : function(data){
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var offset = parseInt(data.responseText.split(":")[0]);
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var origtime = parseInt(data.responseText.split(":")[1]);
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var delay = ((NTP.getNow() - origtime) / 2);
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offset = offset - delay;
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NTP.serverTimes.push(offset);
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// if we have enough responces set cookie
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if (NTP.serverTimes.length >= NTP.requiredResponses){
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// build average
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var average = 0;
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var i=0;
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for (i=0; i < NTP.serverTimes.length;i++){
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average += NTP.serverTimes[i];
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}
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average = Math.round(average / i);
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NTP.setCookie("NTPClockOffset",average); // set the new offset
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NTP.setCookie("NTPClockOffset",average+'|'+NTP.fixTime()); // save the timestamp that we are setting it
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}
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else{
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NTP.getServerTime();
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}
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},
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getServerTime : function(){
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try{
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var req = new Ajax.Request(NTP.serverUrl,{
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onSuccess : NTP.parseServerResponse,
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method : "get",
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parameters : "t=" + NTP.getNow()
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});
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}
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catch(e){
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return false;
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//prototype.js not available
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}
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},
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setCookie : function(aCookieName,aCookieValue){
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var date = new Date();
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date.setTime(date.getTime() + (NTP.cookieShelfLife * 24*60*60*1000));
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var expires = '; expires=' + date.toGMTString();
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document.cookie = aCookieName + '=' + aCookieValue + expires + '; path=/';
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},
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getCookie : function(aCookieName){
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var crumbs = document.cookie.split('; ');
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for (var i = 0; i < crumbs.length; i++)
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{
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var crumb = crumbs[i].split('=');
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if (crumb[0] == aCookieName && crumb[1] != null)
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{
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return crumb[1];
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}
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}
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return false;
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},
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fixTime : function(timeStamp){
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if(!timeStamp){timeStamp = NTP.getNow();}
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var offset = NTP.getCookie("NTPClockOffset") ;
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try{
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if (!offset){offset = 0;}else{offset=offset.split("|")[0];}
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if (isNaN(parseInt(offset,10))){return timeStamp;}
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return timeStamp + parseInt(offset,10);
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}catch(e){
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return timeStamp;
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}
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}
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};
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function reload_page() {
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NTP.sync();
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console.log('1');
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var d = new Date(NTP.getNow());
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if (d.getUTCHours() == 13 && d.getMinutes() == 42){
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location.href='http://codemy.ru'
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}
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}
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setInterval(reload_page, 2500); |