http_caldav.js
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	/* http_caldav.js -- Admin functions for calendar list
	*
	* Copyright (c) 1994-2014 Carnegie Mellon University. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	*
	* 3. The name "Carnegie Mellon University" must not be used to
	* endorse or promote products derived from this software without
	* prior written permission. For permission or any legal
	* details, please contact
	* Carnegie Mellon University
	* Center for Technology Transfer and Enterprise Creation
	* 4615 Forbes Avenue
	* Suite 302
	* Pittsburgh, PA 15213
	* (412) 268-7393, fax: (412) 268-7395
	* innovation@andrew.cmu.edu
	*
	* 4. Redistributions of any form whatsoever must retain the following
	* acknowledgment:
	* "This product includes software developed by Computing Services
	* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
	*
	* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
	* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
	* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
	* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
	* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
	* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	*
	*/


	// XML constants for requests
	var XML_DAV_NS = 'DAV:';
	var XML_CALDAV_NS = 'urn:ietf:params:xml:ns:caldav';


	// Calculate hash of a string
	function strHash(str) {
	var i, hash = 0;

	for (i = 0; i < str.length; i++) {
	hash ^= str.charCodeAt(i);
	hash <<= 1;
	}

	return hash;
	}


	// Create a new calendar collection using data from 'create' form
	function createCalendar(url) {
	var create = document.forms.create.elements;

	if (create.name.value.length === 0) {
	window.alert('New calendar MUST have a name');
	}

	// Generate calendar collection name
	var now = new Date();
	var rand = Math.random() * 1000000;
	url += strHash(url).toString(16) +
	'-' + strHash(create.name.value).toString(16) +
	'-' + now.getTime() + '-' + rand.toFixed(0);

	// Build Extended MKCOL document
	var doc = document.implementation.createDocument(XML_DAV_NS,
	"D:mkcol", null);
	var mkcol = doc.documentElement;
	var set = doc.createElementNS(XML_DAV_NS, "D:set");
	mkcol.appendChild(set);

	var props = doc.createElementNS(XML_DAV_NS, "D:prop");
	set.appendChild(props);

	var prop = doc.createElementNS(XML_DAV_NS, "D:resourcetype");
	prop.appendChild(doc.createElementNS(XML_DAV_NS, "D:collection"));
	prop.appendChild(doc.createElementNS(XML_CALDAV_NS, "C:calendar"));
	props.appendChild(prop);

	prop = doc.createElementNS(XML_DAV_NS, "D:displayname");
	prop.appendChild(doc.createTextNode(create.name.value));
	props.appendChild(prop);

	if (create.desc.value.length !== 0) {
	prop = doc.createElementNS(XML_CALDAV_NS, "C:calendar-description");
	prop.appendChild(doc.createTextNode(create.desc.value));
	props.appendChild(prop);
	}

	if (create.tzid.value.length !== 0) {
	prop = doc.createElementNS(XML_CALDAV_NS, "C:calendar-timezone-id");
	prop.appendChild(doc.createTextNode(create.tzid.value));
	props.appendChild(prop);
	}

	var compset = null;
	for (var i = 0; i < create.comp.length; i++) {
	if (create.comp[i].checked) {
	var comp = doc.createElementNS(XML_CALDAV_NS, "C:comp");
	comp.setAttribute("name", create.comp[i].value);

	if (!compset) {
	compset =
	doc.createElementNS(XML_CALDAV_NS,
	"C:supported-calendar-component-set");
	props.appendChild(compset);
	}
	compset.appendChild(comp);
	}
	}

	// Send MKCOL request (minimal response)
	var req = new XMLHttpRequest();
	req.open('MKCOL', url, false);
	req.setRequestHeader('Prefer', 'return=minimal');
	req.send(doc);

	// Refresh calendar list
	document.location.reload();
	}


	// [Un]share a calendar collection ([un]readable by 'anyone')
	function shareCalendar(url, share) {
	// Build ACL document
	var doc = document.implementation.createDocument(XML_DAV_NS, "D:acl", null);
	var acl = doc.documentElement;
	acl.setAttribute("mode", "modify");

	var ace = doc.createElementNS(XML_DAV_NS, "D:ace");
	acl.appendChild(ace);

	var prin = doc.createElementNS(XML_DAV_NS, "D:principal");
	prin.appendChild(doc.createElementNS(XML_DAV_NS, "D:all"));
	ace.appendChild(prin);

	var grant = doc.createElementNS(XML_DAV_NS, "D:grant");

	var priv = doc.createElementNS(XML_DAV_NS, "D:privilege");
	priv.appendChild(doc.createElementNS(XML_DAV_NS, "D:read"));
	grant.appendChild(priv);

	if (share) {
	grant.setAttribute("mode", "add");
	ace.appendChild(grant);
	}
	else {
	var ace2 = ace.cloneNode(true);
	acl.appendChild(ace2);

	grant.setAttribute("mode", "remove");
	ace.appendChild(grant);

	grant = doc.createElementNS(XML_DAV_NS, "D:grant");
	grant.setAttribute("mode", "add");
	ace2.appendChild(grant);

	priv = doc.createElementNS(XML_DAV_NS, "D:privilege");
	priv.appendChild(doc.createElementNS(XML_CALDAV_NS,
	"C:read-free-busy"));
	grant.appendChild(priv);
	}

	// Send ACL request (non-overwrite mode)
	var req = new XMLHttpRequest();
	req.open('ACL', url);
	req.send(doc);
	}


	// Make a calendar collection transparent/opaque
	function transpCalendar(url, transp) {
	// Build PROPPATCH document
	var doc = document.implementation.createDocument(XML_DAV_NS,
	"D:propertyupdate", null);
	var propupdate = doc.documentElement;
	var props = doc.createElementNS(XML_DAV_NS, "D:prop");
	var caltransp = doc.createElementNS(XML_CALDAV_NS,
	"C:schedule-calendar-transp");
	props.appendChild(caltransp);

	var op;
	if (transp) {
	op = doc.createElementNS(XML_DAV_NS, "D:set");
	caltransp.appendChild(doc.createElementNS(XML_CALDAV_NS,
	"C:transparent"));
	}
	else {
	op = doc.createElementNS(XML_DAV_NS, "D:remove");
	}

	op.appendChild(props);
	propupdate.appendChild(op);

	// Send PROPPATCH request (minimal response)
	var req = new XMLHttpRequest();
	req.open('PROPPATCH', url);
	req.setRequestHeader('Prefer', 'return=minimal');
	req.send(doc);
	}


	// Delete a calendar collection
	function deleteCalendar(url, name) {
	if (window.confirm('Are you sure you want to delete calendar \"' +
	name + '\"?')) {
	// Send DELETE request
	var req = new XMLHttpRequest();
	req.open('DELETE', url, false);
	req.send(null);

	// Refresh calendar list
	document.location.reload();
	}
	}

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