68 lines
2.1 KiB
JavaScript
68 lines
2.1 KiB
JavaScript
/**
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* Copyright (c) 2013 ESHA Research
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* Dual licensed under the MIT and GPL licenses:
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* http://www.opensource.org/licenses/mit-license.php
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* http://www.gnu.org/licenses/gpl.html
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*
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* Allows use of a number as 'overwrite' param on set calls to give time in seconds after
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* which the value should not be retrievable again (an expiration time).
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*
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* Status: BETA - useful, needs testing
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*/
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;(function(_) {
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var prefix = 'exp@',
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suffix = ';',
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parse = _.parse,
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_get = _.get,
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_set = _.set;
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_.parse = function(s, fn) {
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if (s && s.indexOf(prefix) === 0) {
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s = s.substring(s.indexOf(suffix)+1);
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}
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return parse(s, fn);
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};
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_.expires = function(s) {
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if (s && s.indexOf(prefix) === 0) {
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return parseInt(s.substring(prefix.length, s.indexOf(suffix)), 10);
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}
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return false;
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};
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_.when = function(sec) {// if sec, return sec->date, else date->sec
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var now = Math.floor((new Date().getTime())/1000);
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return sec ? new Date((now+sec)*1000) : now;
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};
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_.cache = function(area, key) {
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var s = _get(area, key),
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sec = _.expires(s);
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if (sec && _.when() >= sec) {
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return area.removeItem(key);
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}
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return s;
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};
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_.get = function(area, key) {
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var s = _.cache(area, key);
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return s === undefined ? null : s;
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};
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_.set = function(area, key, string, sec) {
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try {
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if (sec) {
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string = prefix + (_.when()+sec) + suffix + string;
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}
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_set(area, key, string);
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} catch (e) {
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if (e.name === 'QUOTA_EXCEEDED_ERR' || e.name === 'NS_ERROR_DOM_QUOTA_REACHED') {
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var changed = false;
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for (var i=0,m=area.length; i<m; i++) {
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if (_.cache(area, key) === undefined) {
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changed = true;
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}
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}
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if (changed) {
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return _.set.apply(this, arguments);
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}
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}
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throw e;
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}
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};
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})(window.store._, undefined);
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