View source for Widget:ICSGenerator

<includeonly><span class="ics-container"><script>/* Hashing as seen on https://stackoverflow.com/a/52171480 */
var cyrb53 = function(str, seedRaw) {
    var seed = seedRaw || 0;
    var h1 = 0xdeadbeef ^ seed, h2 = 0x41c6ce57 ^ seed;
    for (var i = 0, ch; i < str.length; i++) {
        ch = str.charCodeAt(i);
        h1 = Math.imul(h1 ^ ch, 2654435761);
        h2 = Math.imul(h2 ^ ch, 1597334677);
    }
    h1 = Math.imul(h1 ^ (h1>>>16), 2246822507) ^ Math.imul(h2 ^ (h2>>>13), 3266489909);
    h2 = Math.imul(h2 ^ (h2>>>16), 2246822507) ^ Math.imul(h1 ^ (h1>>>13), 3266489909);
    return 4294967296 * (2097151 & h2) + (h1>>>0);
};

function buildIcsLink(name, start, end) {
	var d= new Date();
	var currentDateString = d.getFullYear() + ("0"+(d.getMonth()+1)).slice(-2) + ("0" + d.getDate()).slice(-2) + "T"
	 + ("0" + d.getHours()).slice(-2) + ("0" + d.getMinutes()).slice(-2) + ("0" + d.getSeconds()).slice(-2);

	var hash = cyrb53("" + name + start + end);

	var icsContent = "BEGIN:VCALENDAR\r\n";
	icsContent += "VERSION:2.0\r\n";
	icsContent += "PRODID:-//iopwiki.com//ICS Widget\r\n";
	icsContent += "CALSCALE:GREGORIAN\r\n";
	icsContent += "BEGIN:VEVENT\r\n";
	icsContent += "DTSTAMP:" + currentDateString + "\r\n";
	icsContent += "UID:" + hash + "\r\n";
	icsContent += "DTSTART;TZID=Etc/UTC:" + start + "\r\n";
	icsContent += "DTEND;TZID=Etc/UTC:" + end + "\r\n";
	icsContent += "SUMMARY:" + name + "\r\n";
	icsContent += "END:VEVENT\r\n";
	icsContent += "END:VCALENDAR\r\n";
	
	var icsLink = document.createElement("a");
	icsLink.classList.add('ics-link');
	icsLink.setAttribute("href", "javascript:void(0);");
	icsLink.setAttribute("target", "_blank");
	icsLink.setAttribute("rel", "noopener");
	icsLink.setAttribute("tooltip", "Download iCal file");
	icsLink.setAttribute("download", "event.ics");
	icsLink.addEventListener('click', function(e) {
		var uriContent = "data:text/calendar," + encodeURIComponent(icsContent);
		e.target.href = uriContent;
	});
	
	var visibleText = document.createTextNode("Download iCal file");
	icsLink.appendChild(visibleText);
	
	var container = document.currentScript.parentNode;
	container.appendChild(icsLink);
}

var icsName = "<!--{$title|escape:'html'}-->";
var icsStart = "<!--{$start|escape:'html'}-->";
var icsEnd = "<!--{$end|escape:'html'}-->";
buildIcsLink(icsName, icsStart, icsEnd);</script></includeonly><noinclude>{{Documentation}}</noinclude>