etherpad-lite/static/js/pad_cookie.js

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/**
* Copyright 2009 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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var padcookie = (function()
{
function getRawCookie()
{
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// returns null if can't get cookie text
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if (!document.cookie)
{
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return null;
}
// look for (start of string OR semicolon) followed by whitespace followed by prefs=(something);
var regexResult = document.cookie.match(/(?:^|;)\s*prefs=([^;]*)(?:;|$)/);
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if ((!regexResult) || (!regexResult[1]))
{
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return null;
}
return regexResult[1];
}
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function setRawCookie(safeText)
{
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var expiresDate = new Date();
expiresDate.setFullYear(3000);
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document.cookie = ('prefs=' + safeText + ';expires=' + expiresDate.toGMTString());
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}
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function parseCookie(text)
{
// returns null if can't parse cookie.
try
{
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var cookieData = JSON.parse(unescape(text));
return cookieData;
}
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catch (e)
{
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return null;
}
}
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function stringifyCookie(data)
{
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return escape(JSON.stringify(data));
}
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function saveCookie()
{
if (!inited)
{
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return;
}
setRawCookie(stringifyCookie(cookieData));
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if (pad.getIsProPad() && (!getRawCookie()) && (!alreadyWarnedAboutNoCookies))
{
alert("Warning: it appears that your browser does not have cookies enabled." + " EtherPad uses cookies to keep track of unique users for the purpose" + " of putting a quota on the number of active users. Using EtherPad without " + " cookies may fill up your server's user quota faster than expected.");
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alreadyWarnedAboutNoCookies = true;
}
}
var wasNoCookie = true;
var cookieData = {};
var alreadyWarnedAboutNoCookies = false;
var inited = false;
var self = {
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init: function(prefsToSet)
{
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var rawCookie = getRawCookie();
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if (rawCookie)
{
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var cookieObj = parseCookie(rawCookie);
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if (cookieObj)
{
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wasNoCookie = false; // there was a cookie
delete cookieObj.userId;
delete cookieObj.name;
delete cookieObj.colorId;
cookieData = cookieObj;
}
}
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for (var k in prefsToSet)
{
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cookieData[k] = prefsToSet[k];
}
inited = true;
saveCookie();
},
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wasNoCookie: function()
{
return wasNoCookie;
},
getPref: function(prefName)
{
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return cookieData[prefName];
},
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setPref: function(prefName, value)
{
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cookieData[prefName] = value;
saveCookie();
}
};
return self;
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}());